97 results on '"Tan BL"'
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2. Maps with precision-dependent periods
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Tan Bl and T. T. Chia
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Physics ,Computer simulation ,Statistical physics ,Logistic map ,Dynamical system ,Atomic and Molecular Physics, and Optics - Published
- 1991
3. Anatomical reduction for treatment of displaced midshaft clavicular fractures: knowles pinning vs reconstruction plating.
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Fu TH, Tan BL, Liu HC, and Wang JW.
- Abstract
The purpose of this study was to compare Knowles pinning and fixation with cerclage wires vs reconstruction plating and fixation with extraplate wires for the treatment of displaced midshaft clavicular fractures, with anatomical reduction serving as the objective. In this retrospective study, the records of 103 consecutive patients with complete follow-up data (minimum 12 months follow-up) treated operatively for displaced midshaft clavicular fractures between 1997 and 2009 by a single surgeon were reviewed. A total of 53 patients (mean age, 35.2±14.5 years) received Knowles pinning and 50 patients (mean age, 39.9±14.8 years) received reconstruction plating. No differences were observed between the groups with respect to type of fracture, union rate (88.7% vs 94.0%, respectively; P=.439), and surgical complication rate (13.2% vs 10.0%, respectively; P=.761). Wound length was significantly shorter in the Knowles pinning group (5.3±0.9 cm vs 8.4±0.5 cm, respectively; P<.001) and implant-related complications, symptomatic hardware (P<.001), visible implant (P<.001), and palpable implant (P<.015) were significantly higher in the reconstruction plating than in the pinning group. Anatomical reduction is the ultimate objective of anatomical and functional restoration when surgical intervention is indicated, and patient compliance is the major prerequisite for surgical treatment. For treatment of displaced midshaft clavicle fractures, both Knowles pinning with cerclage wires and reconstruction plating with extraplate wires provide rigid fixation and perfect union. [ABSTRACT FROM AUTHOR]
- Published
- 2012
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4. Editorial: Preventive potential of antioxidants in age-related diseases.
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Tan BL, Konsue N, Bennett LL, and El-Kenawy AE
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Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
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- 2024
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5. Integrative Neuro-social cognitive Strategy Programme for Instilling REcovery (INSPIRE): a community-based cognitive remediation trial-study procotol.
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Tan BL, Tan N, Koh V, Poh L, and Medalia A
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- Humans, Social Cognition, Adult, Psychotic Disorders therapy, Psychotic Disorders rehabilitation, Psychotic Disorders complications, Community Mental Health Services methods, Male, Female, Metacognition, Cognitive Remediation methods, Schizophrenia therapy, Schizophrenia complications, Schizophrenia rehabilitation
- Abstract
Background: Adults with schizophrenia experience a range of neurocognitive problems that affect their daily functioning. Evidence for the efficacy of cognitive remediation in schizophrenia has been established, but its implementation in under-resourced community-based settings is less well-studied. In recent years, interventions have also focused on the strategy-learning approach in favor of drill-and-practice. Moreover, there is an increasing recognition to address social cognition and negative symptoms alongside neurocognition. This study attempts to carry out cognitive remediation in a community mental health setting. The Neuropsychological and Educational Approach to Remediation (NEAR) is used as the cognitive remediation intervention. Neurocognitive and social cognitive games will be introduced during the computer-assisted cognitive exercises sessions. In addition, the instructional technique will foster the use of metacognition and cognitive strategies. Moreover, metamotivation training will be the focus of some bridging sessions to enhance motivation to engage in goal-directed learning behaviors. The aims of the study are to 1) investigate the effects of cognitive remediation on neurocognition, social cognition and functional outcomes of participants with schizophrenia/schizoaffective disorders in community mental health settings; and 2) explore the mediators for change (eg: metamotivation, metacognition and negative symptoms) in cognitive performance and functional outcomes., Methods: This randomized controlled trial will be conducted in three Singapore Anglican Community Services (SACS) centers, where standard psychiatric rehabilitation is delivered. Participants who are randomized to the experimental arm will receive cognitive remediation and psychiatric rehabilitation, while those randomized to the control arm will receive standard psychiatric rehabilitation only. Cognitive remediation is carried out three times a week for 12 weeks. It consists of computer-assisted cognitive exercises, as well as bridging groups to aid transfer of learning to daily living. Baseline, post-intervention and eight-week follow-up measurements will be collected. Group by time differences in cognitive performance, negative symptoms, metamotivation, metacognition, functioning and recovery will be analyzed across the three time points. Mediators for improvement in cognitive performance and functioning will also be explored., Discussion: Findings of this research will add to the body of knowledge about the key therapeutic ingredients within a strategy-based cognitive remediation program and improve its implementation within under-resourced community settings., Trial Registration: This study has been registered with ClinicalTrials.gov (ID: NCT06286202). Date of registration: 29 February 2024. Date of last update: 21 May 2024., (© 2024. The Author(s).)
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- 2024
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6. Development of oral health resources and a mobile app for caregivers and autistic children through consensus building.
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Tan BL, Nair R, Duggal MS, Aishworiya R, and Tong HJ
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- Child, Humans, Oral Health, Consensus, Caregivers, Mobile Applications, Autistic Disorder, Autism Spectrum Disorder
- Abstract
Lay Abstract: Caregivers of autistic children often lack knowledge regarding oral homecare and when and where to see the dentist. To address this need, we developed a series of information on oral health. An autistic child assisted in developing two social stories to showcase a dental visit. A mobile app was developed to deliver the above mentioned. Other features include creation of customised social stories and visual schedule and an inbox to allow dentists to send messages to parents. The developed information and social stories were reviewed by experts and parents. The app also underwent anonymous and independent testing by parents. Overall the information and app were well received by the experts and parents., Competing Interests: Declaration of conflicting interestsThe author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
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- 2024
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7. Tooth autotransplantation: An umbrella review.
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Tan BL, Tong HJ, Narashimhan S, Banihani A, Nazzal H, and Duggal MS
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- Humans, Transplantation, Autologous, Tooth transplantation
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Tooth autotransplantation is a versatile procedure with several clinical applications among patients across different age groups. The success of this procedure depends on multiple factors. Despite the wealth of studies available, no single primary study or systematic review is able to report on every factor affecting the outcomes of autotransplantation. The aims of this umbrella review were to evaluate treatment-related and patient-related outcomes of autotransplantation and to assess the pre-, peri- or post-operative factors that could affect these. An umbrella review was conducted according to the PRISMA statement. A literature search of five databases was performed up to 25 September 2022. Systematic Reviews (SR) with and without meta-analysis evaluating autotransplantation were included. Calibration among reviewers was carried out prior to study selection, data extraction and Risk of Bias (RoB) assessment. Study overlap was calculated using corrected covered area. Meta-meta-analysis (MMA) was performed for suitable SRs. The AMSTAR 2 critical appraisal tool was used to evaluate the quality of evidence. Seventeen SRs met the inclusion criteria. Only two SRs were suitable for conduct of MMA on autotransplantation of open apex teeth. The 5-year and 10-year survival rates were >95%. A narrative summary on factors that could affect autotransplantation outcomes and comparisons of autotransplantation to other treatment options were reported. Five SRs were rated as 'low quality' and 12 SRs were rated as 'critically low quality' in the AMSTAR 2 RoB assessment. In order to facilitate a more homogenous pool of data for subsequent meta-analysis, an Autotransplantation Outcome Index was also proposed to standardise the definition of outcomes. Autotransplantation of teeth with open apices have a high survival rate. Future studies should standardise the reporting of clinical and radiographic findings, as well as the definition of outcomes., (© 2023 John Wiley & Sons A/S. Published by John Wiley & Sons Ltd.)
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- 2023
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8. Tooth autotransplantation with 3D-printed replicas as part of interdisciplinary management of children and adolescents: Two case reports.
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Dhillon IK, Khor MM, Tan BL, Wong RCW, Duggal MS, Soh SH, and Lu WW
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- Humans, Child, Adolescent, Transplantation, Autologous methods, Cone-Beam Computed Tomography methods, Printing, Three-Dimensional, Tooth, Anodontia, Tooth Loss
- Abstract
The management of missing teeth as a result of dental trauma or associated with hypodontia in children and adolescents presents as a clinical challenge for the dental team. One of the options that is regaining popularity is dental autotransplantation. To improve autotransplantation outcomes, careful interdisciplinary planning, surgical simulation using cone beam computed tomography images and three-dimensional-printed teeth replicas should be undertaken for presurgical preparation. This case report showcases two applications of autotransplantation, with emphasis on interdisciplinary management, presurgical preparation and postsurgical orthodontic and aesthetic management to deliver a good long-term, sustainable, biological outcome, as a part of a comprehensive rehabilitation treatment plan in children., (© 2023 The Authors. Dental Traumatology published by John Wiley & Sons Ltd.)
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- 2023
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9. Rice Bran: From Waste to Nutritious Food Ingredients.
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Tan BL, Norhaizan ME, and Chan LC
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- Animals, Tocopherols, Rice Bran Oil, Food Ingredients, Diabetes Mellitus, Type 2, Tocotrienols, Oryza, Phenylpropionates
- Abstract
Rice ( Oryza sativa L.) is a principal food for more than half of the world's people. Rice is predominantly consumed as white rice, a refined grain that is produced during the rice milling process which removes the bran and germ and leaves the starchy endosperm. Rice bran is a by-product produced from the rice milling process, which contains many bioactive compounds, for instance, phenolic compounds, tocotrienols, tocopherols, and γ-oryzanol. These bioactive compounds are thought to protect against cancer, vascular disease, and type 2 diabetes. Extraction of rice bran oil also generates various by-products including rice bran wax, defatted rice bran, filtered cake, and rice acid oil, and some of them exert bioactive substances that could be utilized as functional food ingredients. However, rice bran is often utilized as animal feed or discarded as waste. Therefore, this review aimed to discuss the role of rice bran in metabolic ailments. The bioactive constituents and food product application of rice bran were also highlighted in this study. Collectively, a better understanding of the underlying molecular mechanism and the role of these bioactive compounds exerted in the rice bran would provide a useful approach for the food industry and prevent metabolic ailments.
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- 2023
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10. Outcomes of preformed metal crowns placed with the conventional and Hall techniques: A systematic review and meta-analysis.
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Chua DR, Tan BL, Nazzal H, Srinivasan N, Duggal MS, and Tong HJ
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- Humans, Crowns, Tooth, Deciduous, Dental Caries therapy
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Background: Preformed metal crowns (PMCs) have been used to restore carious primary molars and have a high success and survival rate. There are two methods currently employed for PMC placement - the conventional technique (CT) and Hall technique (HT)., Aim: This systematic review aims to compare the outcomes of PMCs placed using the CT and HT., Design: This systematic review was conducted according to the Preferred Reporting Items for Systematic Review and Meta-analysis statement. A literature search of five databases was performed up to 23 August 2022. Clinical studies comparing carious primary molars restored with PMCs using either technique with a minimum 12-month follow-up were included. Risk of bias (RoB) assessment was performed using the National Institutes of Health Quality Assessment tool., Results: Five articles met the inclusion criteria, and four were included for meta-analysis. The 12- and 24-month success and survival rates were above 85% for both groups, with no significant differences shown at 12 and 24 months. The HT requires a shorter treatment duration, is more cost-effective and has a high level of acceptability among parents when compared to the CT. Four articles were rated fair, and one article was rated good in the RoB assessment., Conclusion: Greater consideration may be given towards using the HT as part of standard treatment procedures in managing carious primary molars. Future studies should standardise reporting of outcomes to facilitate a more homogeneous pool of data for future meta-analysis., (© 2022 The Authors. International Journal of Paediatric Dentistry published by BSPD, IAPD and John Wiley & Sons Ltd.)
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- 2023
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11. The use of virtual reality and augmented reality in psychosocial rehabilitation for adults with neurodevelopmental disorders: A systematic review.
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Tan BL, Shi J, Yang S, Loh H, Ng D, Choo C, and Medalia A
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Objectives: Virtual reality and augmented reality have been used in psychosocial rehabilitation for adults with neurodevelopmental disorders in recent years, to provide functional training in a scaffolded and appealing manner. This systematic review attempted to evaluate (1) how virtual reality or augmented reality technology was deployed, when used as an intervention for adults with neurodevelopmental disorders; and (2) how virtual or augmented reality-assisted psychosocial rehabilitation programs impacted on the functional domains of community living, employment and social participation., Methods: The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines was adopted and a search of publications between June 2012 and June 2022 was carried out. The target groups were adults with schizophrenia/schizoaffective disorders, autism spectrum disorder, intellectual disabilities and attention deficit hyperactivity disorder. Interventions that targeted at least one functional domain were included., Results: The database search generated 1,267 records and 38 studies met the inclusion criteria. Three studies utilized augmented reality while the rest utilized virtual reality. The virtual scenarios were displayed in various ways, such as head-mounted displays, computer screens, mobile devices and cave rooms. A few studies also used features such as speech recognition, eye tracking and motion-capture device to provide real-time feedback to participants during rehabilitation. Eleven studies reported interventions that addressed community living, 15 studies addressed vocational skills and nine studies trained participants in social skills or social cognition. Three studies sought to improve quality of life using virtual scenarios to expose participants to various situations. Majority of these studies reported preliminary promising results, with improvement in the functional domains addressed. However, several studies had small sample sizes and many single-arm pretest-posttest studies were assessed to be of serious or critical risk of bias., Conclusion: Virtual reality and augmented reality are deployed in various ways to augment psychosocial rehabilitation for adults with neurodevelopmental disorders. Most interventions target skills training or strategy learning in the areas of community living, work and social participation. Preliminary positive findings of their effects on functional performance were reported. Larger and robust studies using ecologically valid outcome measures will be needed to establish their effects on real-world functional outcomes., Systematic Review Registration: identifier: CRD42022335443., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Tan, Shi, Yang, Loh, Ng, Choo and Medalia.)
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- 2022
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12. Identifying psychiatric manifestations in schizophrenia and depression from audio-visual behavioural indicators through a machine-learning approach.
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Xu S, Yang Z, Chakraborty D, Chua YHV, Tolomeo S, Winkler S, Birnbaum M, Tan BL, Lee J, and Dauwels J
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Schizophrenia (SCZ) and depression (MDD) are two chronic mental disorders that seriously affect the quality of life of millions of people worldwide. We aim to develop machine-learning methods with objective linguistic, speech, facial, and motor behavioral cues to reliably predict the severity of psychopathology or cognitive function, and distinguish diagnosis groups. We collected and analyzed the speech, facial expressions, and body movement recordings of 228 participants (103 SCZ, 50 MDD, and 75 healthy controls) from two separate studies. We created an ensemble machine-learning pipeline and achieved a balanced accuracy of 75.3% for classifying the total score of negative symptoms, 75.6% for the composite score of cognitive deficits, and 73.6% for the total score of general psychiatric symptoms in the mixed sample containing all three diagnostic groups. The proposed system is also able to differentiate between MDD and SCZ with a balanced accuracy of 84.7% and differentiate patients with SCZ or MDD from healthy controls with a balanced accuracy of 82.3%. These results suggest that machine-learning models leveraging audio-visual characteristics can help diagnose, assess, and monitor patients with schizophrenia and depression., (© 2022. The Author(s).)
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- 2022
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13. A gamified augmented reality vocational training program for adults with intellectual and developmental disabilities: A pilot study on acceptability and effectiveness.
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Tan BL, Guan FY, Leung IMW, Kee SY, Devilly OZ, and Medalia A
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Objectives: The Augmented Reality Games to Enhance Vocational Ability of Patients (REAP) was an augmented reality vocational training program that provided skills training in the context of a psychiatric rehabilitation program. It was implemented over 10 weeks and consisted of gamified augmented reality café training scenarios and bridging group activities to facilitate transfer of learning to the work context. This pilot study aimed to explore the acceptability and effectiveness of the REAP program when carried out with adults with intellectual and developmental disabilities attending work therapy. Its objectives were: (1) to obtain feedback from participants and trainers on their experiences and acceptability of the REAP program and (2) to measure changes in vocational and cognitive skills of participants in the REAP program., Materials and Methods: This was a pretest-posttest mixed methods study. 15 adults with intellectual and developmental disabilities attending work therapy in a non-profit organization participated in the REAP program and their vocational trainers were involved in assisting in this program. Feasibility Evaluation Checklist (FEC) and the Neurobehavioral Cognitive Status Exam (Cognistat) were administered at baseline, post-training and eight weeks after training. The participants and their trainers also provided user feedback via semi-structured interviews., Results: Majority of the participants and trainers found the REAP program to be useful and interesting. They also found that the augmented reality games were user-friendly and provided a unique opportunity to acquire new skills. Participants who engaged in this program showed a significant improvement in vocational skills and aspects of cognitive skills, which were maintained eight weeks after training., Conclusion: The gamified augmented reality vocational training was feasible and accepted by both adults with intellectual and developmental disabilities and their trainers. When integrated with bridging sessions to facilitate transfer of learning to existing work therapy, participants on the REAP program showed significant improvements in vocational skills and aspects of cognitive skills. Future experimental studies with larger sample size could provide stronger evidence on its effectiveness in improving vocational outcomes., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Tan, Guan, Leung, Kee, Devilly and Medalia.)
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- 2022
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14. Clinical Outcomes After Ventriculo-Peritoneal Shunting in Patients With Classic vs. Complex NPH.
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Goh ET, Lock C, Tan AJL, Tan BL, Liang S, Pillay R, Kumar S, Ahmad-Annuar A, Narayanan V, Kwok J, Tan YJ, Ng AS, Tan EK, Czosnyka Z, Czosnyka M, Pickard JD, and Keong NC
- Abstract
Objective: Normal pressure hydrocephalus (NPH) is a neurological condition characterized by a clinical triad of gait disturbance, cognitive impairment, and urinary incontinence in conjunction with ventriculomegaly. Other neurodegenerative diseases, such as Alzheimer's disease, Parkinson's disease, and vascular dementia share some overlapping clinical features. However, there is evidence that patients with comorbid NPH and Alzheimer's or Parkinson's disease may still exhibit good clinical response after CSF diversion. This study aims to evaluate clinical responses after ventriculo-peritoneal shunt (VPS) in a cohort of patients with coexisting NPH and neurodegenerative disease., Methods: The study has two components; (i) a pilot study was performed that specifically focused upon patients with Complex NPH and following the inclusion of the Complex NPH subtype into consideration for the clinical NPH programme, (ii) a retrospective snapshot study was performed to confirm and characterize differences between Classic and Complex NPH patients being seen consecutively over the course of 1 year within a working subspecialist NPH clinic. We studied the characteristics of patients with Complex NPH, utilizing clinical risk stratification and multimodal biomarkers., Results: There was no significant difference between responders and non-responders to CSF diversion on comorbidity scales. After VPS insertion, significantly more Classic NPH patients had improved cognition compared to Complex NPH patients ( p = 0.005). Improvement in gait and urinary symptoms did not differ between the groups. 26% of the Classic NPH group showed global improvement of the triad, and 42% improved in two domains. Although only 8% showed global improvement of the triad, all Complex NPH patients improved in gait., Conclusions: Our study has demonstrated that the presence of neurodegenerative disorders co-existing with NPH should not be the sole barrier to the consideration of high-volume tap test or lumbar drainage via a specialist NPH programme. Further characterization of distinct cohorts of NPH with differing degrees of CSF responsiveness due to overlay from neurodegenerative or comorbidity risk burden may aid toward more precise prognostication and treatment strategies. We propose a simplistic conceptual framework to describe NPH by its Classic vs. Complex subtypes to promote the clinical paradigm shift toward subspecialist geriatric neurosurgery by addressing needs for rapid screening tools at the clinical-research interface., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2022 Goh, Lock, Tan, Tan, Liang, Pillay, Kumar, Ahmad-Annuar, Narayanan, Kwok, Tan, Ng, Tan, Czosnyka, Czosnyka, Pickard and Keong.)
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- 2022
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15. Cell-Based Therapy for Tooth Replantation Following Avulsion: A Systematic Review.
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Chew JRJ, Tan BL, Lu JX, Tong HJ, and Duggal MS
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- Animals, Dogs, Humans, Prospective Studies, Tooth Replantation adverse effects, Tooth Replantation methods, Ankylosis etiology, Root Resorption etiology, Root Resorption prevention & control, Tooth Avulsion etiology, Tooth Avulsion therapy
- Abstract
The management of avulsed teeth undergoing delayed replantation remains a clinical challenge as there are currently no effective interventions that can improve periodontal healing and prevent replacement root resorption. While several preclinical studies have reported varied success using cell-based tissue engineering to improve periodontal healing, a consensus is required before further clinical translation. Therefore, this systematic review seeks to evaluate the efficacy of cell-based therapy in promoting periodontal healing following delayed replantation in animal models. MEDLINE (PubMed) and Embase were searched on September 27, 2020. Ten studies involving rodent and dog models met the inclusion criteria. Cell sources included gingiva, periodontal ligament (PDL), bone marrow, and adipose tissues. Generally, cell-based therapy had increased the proportion of root surfaces displaying periodontal healing and concomitantly reduced the proportion presenting with replacement root resorption and ankylosis. The best outcomes were observed following treatment with PDL-derived cells of various potency. Future preclinical studies will benefit from adopting measures to minimize bias during the conduct of animal experiments and the standardization of the outcome measures reporting. This will facilitate future reviews with possible pooling of results in the form of meta-analyses, allowing a consensus to be obtained from the literature. In addition, further research will be required to shed light on the implications of using allogeneic cells as well as the optimization of cell delivery protocols. The findings of this systematic review demonstrated the therapeutic potential of certain cell-based therapies in promoting periodontal healing following delayed replantation, thus highlighting their prospective clinical benefits and translational value. Impact statement Current therapies cannot predictably promote periodontal healing following delayed replantation of an avulsed tooth, especially when there is already significant root surface damage. This review systematically assessed the literature for preclinical studies employing cell-based therapies to promote periodontal healing following delayed replantation. The results showed that certain cell-based therapies significantly increased the formation of new periodontal ligament and reduced adverse healing outcomes of replacement root resorption and ankylosis. This highlights the potential clinical benefits and translational value of cell-based therapy for the replantation of avulsed teeth.
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- 2022
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16. Comparative study of emotion recognition and theory of mind between major depressive disorder and schizophrenia.
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Lim K, Yang Z, Rashid NAA, Tan BL, Dauwels J, and Lee J
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- Emotions, Humans, Schizophrenic Psychology, Social Perception, Depressive Disorder, Major, Schizophrenia, Theory of Mind
- Abstract
Background: Social cognition as a transdiagnostic construct between major depressive disorder (MDD) and schizophrenia (SCZ) is not well understood. This may be attributed to the variability of social cognitive measures indexing the same construct. This study aims to compare emotion recognition and theory of mind domains, known to be impaired in SCZ, between MDD and SCZ., Methods: Three groups of participants (N
Total = 150) were enrolled in this study: MDD (n = 51), SCZ (n = 50) and healthy controls (HC; n = 49). Emotion recognition was assessed on the Bell Lysaker Emotion Recognition Task (BLERT) and Penn Emotion Recognition Task (ER40); theory of mind was measured on The Awareness of Social Inference Test (TASIT). Mixed ANCOVAs were utilised to compare social cognitive performance across the groups., Results: SCZ performed poorer in all 3 social cognition tasks compared to both MDD and HC. No statistically significant difference in social cognitive performance was observed between MDD and HC., Conclusions: This study serves as an effort towards employing the same standardised social cognitive measures for direct comparison of performance patterns across diagnostic groups. Future work is needed to extend this in larger samples of different illness severity and diagnostic categories., (Copyright © 2021 Elsevier B.V. All rights reserved.)- Published
- 2021
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17. The Effect of Therapeutic Alliance on Attitudes Toward Psychiatric Medications in Schizophrenia.
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Lim M, Li Z, Xie H, Tan BL, and Lee J
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- Adult, Female, Humans, Male, Middle Aged, Outpatients psychology, Outpatients statistics & numerical data, Surveys and Questionnaires, Antipsychotic Agents therapeutic use, Attitude to Health, Medication Adherence psychology, Schizophrenia drug therapy, Therapeutic Alliance
- Abstract
Purpose/background: The differential influence of therapeutic alliance with different health care professionals on patients' medication adherence has never been examined., Methods/procedures: Ninety-five stable outpatients (91 patients with schizophrenia and 4 patients with schizoaffective disorder) were recruited. Individual, clinical, and medication factors were assessed, along with drug attitude (10-item Drug Attitude Inventory). Comparison on these factors was made between outpatients who identified psychiatrists as the health care professional most involved in their care, as compared with other health care professionals., Findings/results: Older age, longer duration of illness, presence of medical comorbidities, lower levels of internalized stigma, higher levels of insight, higher levels of functioning, lesser severity of depressive symptoms, and positive symptoms were found to be significantly associated with greater levels of drug attitude (small to moderate associations). Only therapeutic alliance had a large correlation with drug attitude (ρ = 0.503, P < 0.001). The therapeutic alliance scores between the 2 health care professionals groups are not significantly different. However, participants who have identified psychiatrists as the health care professional that contributed the most to their recovery reported a significantly more positive attitude (μ = 6.18, SD = 3.42) toward psychiatric medication as compared with the other health care professionals group (μ = 3.11, SD = 5.32, P = 0.004). Only 2 factors, the Revised Helping Alliance Questionnaire (β = 0.424, P < 0.001) and Personal and Social Performance scale (β = 0.272, P = 0.006), were statistically significant predictors of drug attitude., Implications/conclusions: Therapeutic alliance is found to be the lead factor associated with drug attitude in patients with schizophrenia. Identifying psychiatrists as the health care professional most involved in the patients' recovery can greatly increase patients' drug attitudes. Maintaining individuals' functioning also contributes to drug attitude., (Copyright © 2021 Wolters Kluwer Health, Inc. All rights reserved.)
- Published
- 2021
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18. Using the Work Behaviour Inventory and Work Environment Impact Scale to measure employment sustainability for people with severe mental illness in a vocational rehabilitation program.
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Soo Wei Qing D, Kwan Minh K, Chia Kai Xin K, Chai YanLin E, Chern A, Budihardjo V, and Tan BL
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- Humans, Rehabilitation, Vocational, Retrospective Studies, Workplace, Employment, Supported, Mental Disorders, Occupational Therapy
- Abstract
Objective: People with severe mental illness often have difficulty sustaining employment. Work Behaviour Inventory and Work Environment Impact Scale are vocational assessments used by occupational therapists to evaluate the facilitators and barriers of work performance and work environment respectively. These factors may have an impact on job tenure and can inform occupational therapy practice., Methods: This study analysed retrospective data of 85 clients who attended a 3-month Employment Internship Program from August 2016 to August 2017. Scores from Work Behaviour Inventory and Work Environment Impact Scale were analysed for associations with job tenure. Repeated measures were used to determine significant changes in Work Behaviour Inventory composite scores across the 3 months., Results: One-month Work Behaviour Inventory composite scores, three Work Behaviour Inventory domains (cooperativeness, work habits, work quality), and three Work Environment Impact Scale domains (time demands, supervisor interaction, architecture) were significantly associated with job tenure. Significant differences in mean job tenure were also found between participants of different internship status. However, these factors did not predict job tenure in regression analysis. There were significant improvements in Work behaviour Inventory composite scores from the first to third month., Conclusions: Work behaviours such as cooperativeness, work habits, and work quality as well as work characteristics such as time demands, supervisor interaction, and workplace architecture may play a role in influencing job tenure. Occupational therapists may consider such factors and provide more targeted interventions to effectively sustain employment., (© 2021 Occupational Therapy Australia.)
- Published
- 2021
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19. Oxidative Stress, Diet and Prostate Cancer.
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Tan BL and Norhaizan ME
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Prostate cancer has become the second leading cancer in men worldwide. Androgen plays an important role in normal functioning, development, and differentiation of the prostate, and thus is considered to be the most powerful candidate that mediates reactive oxygen species (ROS) balance in the prostate. The elevation of ROS has been associated with the progression and development of this disease. Conventional therapy has shown a high cure rate in patients with localized prostate cancer. Despite the patients respond favorably initially, this therapy fails to response in the advanced stage of the diseases even in the absence of androgens. Indeed, the onset and progression of prostate cancer could be prevented by changing dietary habits. Much information indicates that oxidative stress and prostate cancer can be modulated by dietary components rich in antioxidants. While there is substantial evidence to suggest an association between prostate cancer risk and ROS-mediated oxidative stress; therefore, the interactions and mechanisms of this phenomenon are worth to discuss further. This review aimed to discuss the mechanisms of action of oxidative stress involved in the progression of prostate cancer. We also highlighted how some of the vital dietary components dampen or exacerbate inflammation, oxidative stress, and prostate cancer. Overall, the reported information would provide a useful approach to the prevention of prostate cancer., Competing Interests: The authors have nothing to disclose., (Copyright © 2021 Korean Society for Sexual Medicine and Andrology.)
- Published
- 2021
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20. Predicting Real-World Functioning in Schizophrenia: The Relative Contributions of Neurocognition, Functional Capacity, and Negative Symptoms.
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Yang Z, Lee SH, Abdul Rashid NA, See YM, Dauwels J, Tan BL, and Lee J
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Neurocognition and functional capacity are commonly reported predictors of real-world functioning in schizophrenia. However, the additional impact of negative symptoms, specifically its subdomains, i.e., diminished expression (DE) and avolition-apathy (AA), on real-world functioning remains unclear. The current study assessed 58 individuals with schizophrenia. Neurocognition was assessed with the Brief Assessment of Cognition in Schizophrenia, functional capacity with the UCSD Performance-based Skills Assessment (UPSA-B), and negative symptoms with the Negative Symptom Assessment-16. Real-world functioning was assessed with the Multnomah Community Ability Scale (MCAS) with employment status as an additional objective outcome. Hierarchical regressions and sequential logistic regressions were used to examine the associations between the variables of interest. The results show that global negative symptoms contribute substantial additional variance in predicting MCAS and employment status above and beyond the variance accounted for by neurocognition and functional capacity. In addition, both AA and DE predict the MCAS after controlling for cognition and functional capacity. Only AA accounts for additional variance in employment status beyond that by UPSA-B. In summary, negative symptoms contribute substantial additional variance in predicting both real-world functioning and employment outcomes after accounting for neurocognition and functional capacity. Our findings emphasize both DE and AA as important treatment targets in functional recovery for people with schizophrenia., Competing Interests: The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest., (Copyright © 2021 Yang, Lee, Abdul Rashid, See, Dauwels, Tan and Lee.)
- Published
- 2021
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21. Macular vessel density, branching complexity and foveal avascular zone size in normal tension glaucoma.
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Cheng KKW, Tan BL, Brown L, Gray C, Bianchi E, Dhillon B, MacGillivray T, and Tatham AJ
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- Aged, Biomarkers, Female, Fovea Centralis diagnostic imaging, Humans, Intraocular Pressure, Low Tension Glaucoma diagnostic imaging, Macula Lutea diagnostic imaging, Macula Lutea pathology, Male, Prospective Studies, Retinal Neurons pathology, Tomography, Optical Coherence, Fovea Centralis pathology, Low Tension Glaucoma pathology, Macula Lutea blood supply
- Abstract
The aim of this study was to investigate the relationship between glaucoma severity and perifoveal vessel density (pfVD), branching complexity, and foveal avascular zone (FAZ) size in normal tension glaucoma (NTG). 31 patients with NTG washed out of glaucoma medications were subjected to tests including; intraocular pressure measurement; standard automated perimetry; optical coherence tomography (OCT) measurement of macular ganglion cell complex (mGCC), inner macular thickness (IMT) and circumpapillary retinal nerve fibre layer (cpRNFL); and OCT angiography measurement of pfVD, FAZ perimeter and multispectral fractal dimensions (MSFD). Eyes with more severe glaucoma had significantly thinner mGCC and cpRNFL and lower pfVD. MD decreased by 0.4 dB (95% CI 0.1 to 0.6 dB, P = 0.007) for every 1% decrease in pfVD. Lower MSFD was observed in eyes with lower pfVD and in patients with systemic hypertension. Multivariable analysis, accounting for age and OCTA quality, found lower pfVD remained significantly associated with thinner IMT, thinner mGCC and worse MD but not with MSFD. pfVD was reduced in NTG and was diminished in eyes with worse MD. Macular vessel branching complexity was not related to severity of visual field loss but was lower in patients with systemic hypertension.
- Published
- 2021
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22. An Overview of In Vitro , In Vivo , and Computational Techniques for Cancer-Associated Angiogenesis Studies.
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Rahman HS, Tan BL, Othman HH, Chartrand MS, Pathak Y, Mohan S, Abdullah R, and Alitheen NB
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- Animals, Cell Proliferation, Chick Embryo, Chorioallantoic Membrane, Coculture Techniques, Collagen, Computer Simulation, Drug Combinations, Endothelial Cells metabolism, Endothelium metabolism, Human Umbilical Vein Endothelial Cells, Humans, In Vitro Techniques, Laminin, Mice, Models, Theoretical, Proteoglycans, Signal Transduction, Vascular Endothelial Growth Factor A metabolism, Wound Healing, Angiogenesis Inhibitors therapeutic use, Neoplasms blood supply, Neoplasms drug therapy, Neovascularization, Pathologic pathology
- Abstract
Angiogenesis is a crucial area in scientific research because it involves many important physiological and pathological processes. Indeed, angiogenesis is critical for normal physiological processes, including wound healing and embryonic development, as well as being a component of many disorders, such as rheumatoid arthritis, obesity, and diabetic retinopathies. Investigations of angiogenic mechanisms require assays that can activate the critical steps of angiogenesis as well as provide a tool for assessing the efficacy of therapeutic agents. Thus, angiogenesis assays are key tools for studying the mechanisms of angiogenesis and identifying the potential therapeutic strategies to modulate neovascularization. However, the regulation of angiogenesis is highly complex and not fully understood. Difficulties in assessing the regulators of angiogenic response have necessitated the development of an alternative approach. In this paper, we review the standard models for the study of tumor angiogenesis on the macroscopic scale that include in vitro , in vivo , and computational models. We also highlight the differences in several modeling approaches and describe key advances in understanding the computational models that contributed to the knowledge base of the field., Competing Interests: No conflict of interest is recorded for this review article., (Copyright © 2020 Heshu Sulaiman Rahman et al.)
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- 2020
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23. Using the CHIME Personal Recovery Framework to Evaluate the Validity of the MHRM-10 in Individuals with Psychosis.
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Lim M, Xie H, Li Z, Tan BL, and Lee J
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- Adult, Female, Humans, Male, Middle Aged, Reproducibility of Results, Social Stigma, Depression psychology, Empowerment, Patient Outcome Assessment, Psychometrics standards, Psychotic Disorders physiopathology, Psychotic Disorders psychology, Psychotic Disorders rehabilitation, Schizophrenia physiopathology, Schizophrenia rehabilitation, Self Concept
- Abstract
The recovery movement has revealed that outcomes which focuses on just symptoms and functioning may not be holistic and that consumer-rated outcomes may contribute to a more holistic and person-centric care model. However, a brief and effective measure is required in clinical settings; hence, the aim of the current study is to evaluate the psychometric properties of the briefest personal recovery measure- Mental Health Recovery Measure-10 items, using the CHIME (Connectedness, Hope and optimism about the future, Identity, Meaning in life, Empowerment) personal recovery framework. 64 outpatients with schizophrenia or schizoaffective disorder were assessed at two time points, 2 weeks apart. Data collected included sociodemographic information, MHRM-10, Psychological factors related to the CHIME framework, in respective order: RYFF subscale positive relations with others; Herth Hope Index (HHI); Internalized Stigma of Mental Illness (ISMI) and RYFF subscale self-acceptance; World Health Organization Quality of Life- BRIEF (WHOQOL-BREF); Empowerment, and Clinical factors- symptoms as measured by Positive and Negative Syndrome Scale, functioning (PSP) and depressive symptoms (CDSS). MHRM-10 demonstrated convergent validity with CHIME personal recovery psychological factors (all ρ > 0.5). MHRM-10 had excellent internal consistency (Cronbach's alpha = 0.904) and adequate test-retest reliability (ρ = 0.742, p < 0.001). Initial factor structure analysis revealed a one factor structure. The MHRM-10 is a valid instrument for use and can serve as a tool to facilitate a more collaborative and person-centric model of care for individuals with psychosis.
- Published
- 2020
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24. Plasticity of DNA methylation, functional brain connectivity and efficiency in cognitive remediation for schizophrenia.
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Ho NF, Tng JXJ, Wang M, Chen G, Subbaraju V, Shukor S, Ng DSX, Tan BL, Puang SJ, Kho SH, Siew RWE, Sin GL, Eu PW, Zhou J, Sng JCG, Sim K, and Medalia A
- Subjects
- Brain diagnostic imaging, Brain Mapping, DNA Methylation, Humans, Magnetic Resonance Imaging, Reelin Protein, Cognitive Remediation, Schizophrenia genetics
- Abstract
Cognitive remediation (CR) is predicated on principles of neuroplasticity, but the actual molecular and neurocircuitry changes underlying cognitive change in individuals with impaired neuroplastic processes is poorly understood. The present study examined epigenetic-neurocircuitry-behavioral outcome measures in schizophrenia, before and after participating in a CR program that targeted higher-order cognitive functions. Outcome measures included DNA methylation of genes central to synaptic plasticity (CpG sites of Reelin promoter and BDNF promoter) from buccal swabs, resting-state functional brain connectivity and topological network efficiency, and global scores of a cognitive battery from 35 inpatients in a rehabilitative ward (18 CR, 17 non-CR) with similar premorbid IQ to 15 healthy controls. Baseline group differences between healthy controls and schizophrenia, group-by-time effects of CR in schizophrenia, and associations between the outcome measures were tested. Baseline functional connectivity abnormalities within the frontal, fronto-temporal and fronto-parietal regions, and trending decreases in global efficiency, but not DNA methylation, were found in schizophrenia; the frontal and fronto-temporal connectivity, and global efficiency correlated with global cognitive performance across all individuals. Notably, CR resulted in differential changes in Reelin promoter CpG methylation levels, altered within-frontal and fronto-temporal functional connectivity, increasing global efficiency and improving cognitive performance in schizophrenia, when compared to non-CR. In the CR inpatients, positive associations between the micro to macro measures: Reelin methylation changes, higher global efficiency and improving global cognitive performance were found. Present findings provide a neurobiological insight into potential CR-led epigenetics-neurocircuitry modifications driving cognitive plasticity., Competing Interests: Declaration of competing interest Dr. Medalia discloses a royalty from Oxford University Press. All the other authors report no financial conflict of interest., (Copyright © 2020 Elsevier Ltd. All rights reserved.)
- Published
- 2020
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25. Defining Occupational Competence and Occupational Identity in the Context of Recovery in Schizophrenia.
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Tan BL, Zhen Lim MW, Xie H, Li Z, and Lee J
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- Adult, Cross-Sectional Studies, Hope, Humans, Mental Health, Occupational Therapy, Schizophrenia
- Abstract
Importance: The Occupational Self Assessment (OSA) measures two constructs from the Model of Human Occupation: occupational competence and occupational identity. In the field of mental health, the recovery movement has sparked discussions about what constitutes personal, clinical, and functional recovery. However, how occupation-based terminologies are related to the recovery framework is unclear., Objective: To elucidate how domains of recovery and psychological constructs are related to the OSA's constructs of occupational competence and occupational identity in order to inform occupational therapy practice in the recovery arena., Design: Cross-sectional study., Setting: Outpatient mental health unit., Participants: Sixty-six community-dwelling adults with schizophrenia recruited through convenience sampling., Outcomes and Measures: Participants completed the OSA and clinical, functional, and personal recovery assessments. They also completed five scales that measured psychological constructs of recovery such as hope, resilience, empowerment, internalized stigma, and subjective well-being. Participants also identified up to four OSA items that were priorities for change. Tests of association and multiple regression analyses were conducted to identify predictors of occupational competence and occupational identity., Results: Personal recovery predicted occupational competence, whereas depressive symptoms and hope predicted occupational identity. Functional and clinical recovery did not predict occupational competence. The top three OSA priorities for change were performance items: "managing my finances," "concentrating on my tasks," and "taking care of myself.", Conclusions and Relevance: Occupational therapy interventions should not be limited to functional improvement. Instead, they should account for clients' affective states and seek to instill recovery-oriented psychological states such as hope and efficacy., What This Article Adds: Occupational competence is achieved by enhancing personal states of self-efficacy in fulfilling valued occupations rather than through functional improvement. The top three occupations prioritized for change were performance tasks that were observable by service users and immediate caregivers. Empowering clients to partake in these everyday performance tasks such as finance management, concentrating on tasks, and self-care may pave the way to enhancing occupational competence and identity., (Copyright © 2020 by the American Occupational Therapy Association, Inc.)
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- 2020
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26. Effect of High-Fat Diets on Oxidative Stress, Cellular Inflammatory Response and Cognitive Function.
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Tan BL and Norhaizan ME
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- Cell Proliferation drug effects, Cognitive Dysfunction etiology, Humans, Cognition drug effects, Diet, High-Fat adverse effects, Dietary Fats pharmacology, Inflammation, Oxidative Stress drug effects
- Abstract
Cognitive dysfunction is linked to chronic low-grade inflammatory stress that contributes to cell-mediated immunity in creating an oxidative environment. Food is a vitally important energy source; it affects brain function and provides direct energy. Several studies have indicated that high-fat consumption causes overproduction of circulating free fatty acids and systemic inflammation. Immune cells, free fatty acids, and circulating cytokines reach the hypothalamus and initiate local inflammation through processes such as microglial proliferation. Therefore, the role of high-fat diet (HFD) in promoting oxidative stress and neurodegeneration is worthy of further discussion. Of particular interest in this article, we highlight the associations and molecular mechanisms of HFD in the modulation of inflammation and cognitive deficits. Taken together, a better understanding of the role of oxidative stress in cognitive impairment following HFD consumption would provide a useful approach for the prevention of cognitive dysfunction.
- Published
- 2019
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27. Gene surgery: Potential applications for human diseases.
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El-Kenawy A, Benarba B, Neves AF, de Araujo TG, Tan BL, and Gouri A
- Abstract
Gene therapy became in last decade a new emerging therapeutic era showing promising results against different diseases such as cancer, cardiovascular diseases, diabetes, and neurological disorders. Recently, the genome editing technique for eukaryotic cells called CRISPR-Cas (Clustered Regulatory Interspaced Short Palindromic Repeats) has enriched the field of gene surgery with enhanced applications. In the present review, we summarized the different applications of gene surgery for treating human diseases such as cancer, diabetes, nervous, and cardiovascular diseases, besides the molecular mechanisms involved in these important effects. Several studies support the important therapeutic applications of gene surgery in a large number of health disorders and diseases including β-thalassemia, cancer, immunodeficiencies, diabetes, and neurological disorders. In diabetes, gene surgery was shown to be effective in type 1 diabetes by triggering different signaling pathways. Furthermore, gene surgery, especially that using CRISPR-Cas possessed important application on diagnosis, screening and treatment of several cancers such as lung, liver, pancreatic and colorectal cancer. Nevertheless, gene surgery still presents some limitations such as the design difficulties and costs regarding ZFNs (Zinc Finger Nucleases) and TALENs (Transcription Activator-Like Effector Nucleases) use, off-target effects, low transfection efficiency, in vivo delivery-safety and ethical issues., (Copyright © 2019 El-Kenawy et al.)
- Published
- 2019
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28. An Asian study on clinical and psychological factors associated with personal recovery in people with psychosis.
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Lim M, Li Z, Xie H, Tan BL, and Lee J
- Subjects
- Adult, Female, Hope physiology, Humans, Male, Middle Aged, Psychometrics, Psychotic Disorders therapy, Reproducibility of Results, Singapore epidemiology, Social Stigma, Asian People psychology, Personal Satisfaction, Psychotic Disorders epidemiology, Psychotic Disorders psychology, Quality of Life psychology, Recovery of Function physiology
- Abstract
Background: Despite the rising recognition of personal recovery, there is a lack of research on personal recovery in individuals with psychosis in Singapore. This study aims to evaluate the psychometric properties of the QPR-15 using the CHIME personal recovery framework and to examine its associations with clinical recovery factors., Methods: Sixty-six stable outpatients were recruited and assessed at two time points approximately 2 weeks apart. Convergent validity was examined through Spearman correlations with scores on CHIME-related psychological factors: connectedness (Ryff subscale- positive relations with others), hope (Herth Hope Index- abbreviated), identity (Ryff subscale- self-acceptance, Internalized Stigma of Mental Illness- Brief), meaning (World Health Organization Quality of Life Assessment-Brief Form), empowerment (Empowerment Scale). Pearson's correlation was used to examine the test-retest reliability, while Cronbach's alpha was used to examine internal consistency. The initial factor structure was evaluated via principal component analysis, Velicer's minimum average partial (MAP) criteria, parallel analysis, and a scree plot. Spearman correlations and hierarchical multiple linear regression (controlling for age and gender) were employed to examine the association of clinical (symptoms and functioning) and psychological factors with the QPR-15., Results: The QPR-15 demonstrated convergent validity with all CHIME-related psychological factors (r
s ranged from 0.472 to 0.687). Internal consistency was excellent (Cronbach's alpha = 0.934), and test-retest reliability was adequate (r = 0.708). Initial factor structure evaluations revealed a one-factor model. Correlations of clinical factors with the QPR-15 were mostly low (rs ranged from - 0.105 to - 0.544) but significant, except for depressive symptoms (CDSS: rs = - 0.529 to - 0.544), while correlations were moderate for psychological factors. Clinical factors significantly explained 28.3-31.8% of the variance of the QPR-15. Adding psychological factors significantly increased the model variance at baseline (∆ adjusted R2 = 0.369, F change < 0.001) and at time point 2 (∆ adjusted R2 = 0.208, F change < 0.001)., Conclusion: Our results provide preliminary evidence that the QPR-15 has adequate psychometric properties in Singapore and encompasses the CHIME personal recovery framework. In addition, our results suggest that clinical recovery and personal recovery are not substitutes for each other but rather are complementary, thereby promoting a more holistic evaluation of recovery in people with psychosis. Implications are discussed.- Published
- 2019
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29. Curcumin Combination Chemotherapy: The Implication and Efficacy in Cancer.
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Tan BL and Norhaizan ME
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- Animals, Anticarcinogenic Agents administration & dosage, Anticarcinogenic Agents adverse effects, Anticarcinogenic Agents therapeutic use, Antineoplastic Agents, Phytogenic administration & dosage, Antineoplastic Agents, Phytogenic adverse effects, Antineoplastic Agents, Phytogenic chemistry, Antineoplastic Agents, Phytogenic therapeutic use, Antineoplastic Combined Chemotherapy Protocols adverse effects, Clinical Trials as Topic, Curcumin administration & dosage, Curcumin chemistry, Drug Compounding, Drug Evaluation, Preclinical, Drug Synergism, Humans, Neoplasms metabolism, Oxidative Stress drug effects, Theranostic Nanomedicine methods, Treatment Outcome, Antineoplastic Combined Chemotherapy Protocols therapeutic use, Neoplasms drug therapy
- Abstract
Many chemotherapeutic drugs have been used for the treatment of cancer, for instance, doxorubicin, irinotecan, 5-fluorouracil, cisplatin, and paclitaxel. However, the effectiveness of chemotherapy is limited in cancer therapy due to drug resistance, therapeutic selectivity, and undesirable side effects. The combination of therapies with natural compounds is likely to increase the effectiveness of drug treatment as well as reduce the adverse outcomes. Curcumin, a polyphenolic isolated from Curcuma longa , belongs to the rhizome of Zingiberaceae plants. Studies from in vitro and in vivo revealed that curcumin exerts many pharmacological activities with less toxic effects. The biological mechanisms underlying the anticancer activity of co-treatment curcumin and chemotherapy are complex and worth to discuss further. Therefore, this review aimed to address the molecular mechanisms of combined curcumin and chemotherapy in the treatment of cancer. The anticancer activity of combined nanoformulation of curcumin and chemotherapy was also discussed in this study. Taken together, a better understanding of the implication and underlying mechanisms of action of combined curcumin and chemotherapy may provide a useful approach to combat cancer diseases.
- Published
- 2019
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30. Automated Verbal and Non-verbal Speech Analysis of Interviews of Individuals with Schizophrenia and Depression.
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Xu S, Yang Z, Chakraborty D, Victoria Chua YH, Dauwels J, Thalmann D, Thalmann NM, Tan BL, and Chee Keong JL
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- Depression, Humans, Quality of Life, Schizophrenia, Schizophrenic Psychology, Speech
- Abstract
Schizophrenia and depression are the two most common mental disorders associated with negative symptoms that contribute to poor functioning and quality of life for millions of patients globally. This study is part of a larger research project. The overall aim of the project is to develop an automated objective pipeline that aids clinical diagnosis and provides more insights into symptoms of mental illnesses. In our previous work, we have analyzed non-verbal cues and linguistic cues of individuals with schizophrenia. In this study, we extend our work to include participants with depression. Powered by natural language processing techniques, we extract verbal features, both dictionary-based and vector-based, from participants' interviews that were automatically transcribed. We also extracted conversational, phonatory, articulatory and prosodic features from the interviews to understand the conversational and acoustic characteristics of schizophrenia and depression. Combining these features, we applied ensemble learning with leave-one-out cross-validation to classify healthy controls, schizophrenic and depressive patients, achieving an accuracy of 69%-75% in paired classification. From those same features, we also predict the subjective Negative Symptoms Assessment 16 scores of patients with schizophrenia or depression, yielding an accuracy of 90.5% for NSA2 but lower accuracy for other NSA indices. Our analysis also revealed significant linguistic and non-verbal differences that are potentially symptomatic of schizophrenia and depression respectively.
- Published
- 2019
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31. Carotenoids: How Effective Are They to Prevent Age-Related Diseases?
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Tan BL and Norhaizan ME
- Subjects
- Biological Availability, Carotenoids adverse effects, Carotenoids chemistry, Carotenoids metabolism, Diet, Humans, Oxidative Stress, Aging physiology, Carotenoids therapeutic use, Disease
- Abstract
Despite an increase in life expectancy that indicates positive human development, a new challenge is arising. Aging is positively associated with biological and cognitive degeneration, for instance cognitive decline, psychological impairment, and physical frailty. The elderly population is prone to oxidative stress due to the inefficiency of their endogenous antioxidant systems. As many studies showed an inverse relationship between carotenoids and age-related diseases (ARD) by reducing oxidative stress through interrupting the propagation of free radicals, carotenoid has been foreseen as a potential intervention for age-associated pathologies. Therefore, the role of carotenoids that counteract oxidative stress and promote healthy aging is worthy of further discussion. In this review, we discussed the underlying mechanisms of carotenoids involved in the prevention of ARD. Collectively, understanding the role of carotenoids in ARD would provide insights into a potential intervention that may affect the aging process, and subsequently promote healthy longevity.
- Published
- 2019
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32. Non-verbal speech cues as objective measures for negative symptoms in patients with schizophrenia.
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Tahir Y, Yang Z, Chakraborty D, Thalmann N, Thalmann D, Maniam Y, Binte Abdul Rashid NA, Tan BL, Lee Chee Keong J, and Dauwels J
- Subjects
- Adult, Automation, Female, Humans, Male, Surveys and Questionnaires, Cues, Schizophrenia physiopathology, Speech physiology
- Abstract
Negative symptoms in schizophrenia are associated with significant burden and possess little to no robust treatments in clinical practice today. One key obstacle impeding the development of better treatment methods is the lack of an objective measure. Since negative symptoms almost always adversely affect speech production in patients, speech dysfunction have been considered as a viable objective measure. However, researchers have mostly focused on the verbal aspects of speech, with scant attention to the non-verbal cues in speech. In this paper, we have explored non-verbal speech cues as objective measures of negative symptoms of schizophrenia. We collected an interview corpus of 54 subjects with schizophrenia and 26 healthy controls. In order to validate the non-verbal speech cues, we computed the correlation between these cues and the NSA-16 ratings assigned by expert clinicians. Significant correlations were obtained between these non-verbal speech cues and certain NSA indicators. For instance, the correlation between Turn Duration and Restricted Speech is -0.5, Response time and NSA Communication is 0.4, therefore indicating that poor communication is reflected in the objective measures, thus validating our claims. Moreover, certain NSA indices can be classified into observable and non-observable classes from the non-verbal speech cues by means of supervised classification methods. In particular the accuracy for Restricted speech quantity and Prolonged response time are 80% and 70% respectively. We were also able to classify healthy and patients using non-verbal speech features with 81.3% accuracy., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2019
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33. Manilkara zapota (L.) P. Royen leaf water extract triggered apoptosis and activated caspase-dependent pathway in HT-29 human colorectal cancer cell line.
- Author
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Tan BL and Norhaizan ME
- Subjects
- Animals, Apoptosis physiology, BALB 3T3 Cells, Cell Survival drug effects, Cell Survival physiology, Colorectal Neoplasms pathology, Dose-Response Relationship, Drug, Enzyme Activation drug effects, Enzyme Activation physiology, HCT116 Cells, HT29 Cells, HeLa Cells, Humans, Mice, Plant Extracts isolation & purification, Plant Extracts therapeutic use, Apoptosis drug effects, Caspases metabolism, Colorectal Neoplasms metabolism, Manilkara, Plant Extracts pharmacology, Plant Leaves
- Abstract
Manilkara zapota (L.) P. Royen (Family: Sapotaceae), commonly called as sapodilla, has been applied as traditional folk medicine for diarrhea and pulmonary infections. Conventional therapy in colorectal cancer is not likely effective due to undesirable outcomes. The anti-colon cancer properties of Manilkara zapota leaf water extract have yet to be investigated thus far. Therefore, our present study aimed to evaluate the ability to induce apoptosis and the underlying mechanisms of Manilkara zapota leaf water extract against human colorectal cancer (HT-29) cells. The cytotoxicity of Manilkara zapota leaf water extract was screened in different cancer cell lines using 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) and lactate dehydrogenase (LDH) analyses. The morphological changes in HT-29 cell lines after exposure to Manilkara zapota leaf water extract were viewed under fluorescence and inverted light microscope. The apoptotic cell was measured by Annexin V-propidium iodide staining. The caspase-3 and -8 activities were assessed by colorimetric assay. Overall analyses revealed that treatment with Manilkara zapota leaf water extract for 72 h can inhibit the viability of HT-29 cells. Incubation with Manilkara zapota leaf water extract for 24, 48, and 72 h significantly increased (p < 0.05) the total apoptotic cells compared to the control. Treatment with 21, 42, and 84 μg/mL of Manilkara zapota leaf water extract for 72 h triggered both caspase-3 and -8 activities in a concentration-dependent pattern. We also found that the catalase level in the two treatment groups (21 and 42 μg/mL) was significantly elevated after 24 h incubation. Incubation with Manilkara zapota leaf water extract for 72 h triggered the transcriptional elevation of the adenomatous polyposis coli (APC), glycogen synthase kinase 3β (GSK3β), AXIN1, and casein kinase 1 (CK1). The β-catenin mRNA levels were reduced accordingly when the concentration of the Manilkara zapota leaf water extract was increased. Our results suggested that Manilkara zapota leaf water extract offer great potential against colorectal cancer through modulation of Wnt/β-catenin signaling pathway, caspase-dependent pathway, and antioxidant enzyme., (Copyright © 2018. Published by Elsevier Masson SAS.)
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- 2019
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34. Manilkara zapota (L.) P. Royen Leaf Water Extract Induces Apoptosis in Human Hepatocellular Carcinoma (HepG2) Cells via ERK1/2/Akt1/JNK1 Signaling Pathways.
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Tan BL, Norhaizan ME, and Chan LC
- Abstract
Manilkara zapota (L.) P. Royen, called sapodilla, or locally known as ciku , belongs to the family Sapotaceae . We found that Manilkara zapota leaf water extract has cytotoxic effect against human hepatocellular carcinoma (HepG2) cell line in our earlier study. Therefore, this study aimed to explore the anticancer properties of Manilkara zapota leaf water extract in HepG2 cells. We also aimed to unravel yet undiscovered mechanisms and identified several expressed genes whose functions in cytotoxicity activity of Manilkara zapota leaf water extract in HepG2 cells have not been well-studied. The apoptosis and intracellular reactive oxygen species (ROS) activities were analyzed using Annexin V-propidium iodide staining and dichlorodihydrofluorescein diacetate, respectively, by NovoCyte Flow Cytometer. Bax and Bcl-2 expression were assessed using Enzyme-Linked Immunosorbent Assay. The associated molecular pathways were evaluated by quantitative real-time PCR. Overall analyses revealed that Manilkara zapota leaf water extract can increase percentage of early apoptotic cells, induce the formation of ROS, upregulate c-Jun N-terminal kinase 1 ( JNK1 ) and inducible nitric oxide synthase ( iNOS ), and reduce Akt1 and vascular endothelial growth factor A ( VEGFA ) transcriptional activities. Our data suggest that Manilkara zapota leaf water extract can suppress the growth of HepG2 cells via modulation of ERK1/2 / Akt1 / JNK1 transcriptional expression.
- Published
- 2018
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35. Factors Associated with Changes in Community Ability and Recovery After Psychiatric Rehabilitation: A Retrospective Study.
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Tan BL, Ng WY, Sudhasan J, Chng T, Mok I, and Lee J
- Subjects
- Adult, Female, Humans, Interpersonal Relations, Male, Mental Disorders psychology, Retrospective Studies, Schizophrenia rehabilitation, Social Participation psychology, Mental Disorders rehabilitation, Social Skills
- Abstract
One of the key goals of psychiatric rehabilitation is to return individuals with mental illnesses back into the community via restoration of the necessary skills. This retrospective study seeks to evaluate the factors associated with improvement in community functioning after a period of outpatient rehabilitation. 223 individuals enrolled into three broad rehabilitation groups-clinical, vocational and creative therapies/individual sessions-were included in this study. The Multnomah Community Ability Scale (MCAS) and Milestones of Recovery Scale (MORS) were used to evaluate each individual before and after the rehabilitation programme. Across all three groups, there were significant improvements in MCAS scores and MORS ratings. In multivariate models, clinical rehabilitation group was superior to creative therapies/individual sessions in predicting MORS change. The study also revealed a close relationship between recovery gains and improvement in community ability.
- Published
- 2018
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36. An Intrinsic Mitochondrial Pathway Is Required for Phytic Acid-Chitosan-Iron Oxide Nanocomposite (Phy-CS-MNP) to Induce G₀/G₁ Cell Cycle Arrest and Apoptosis in the Human Colorectal Cancer (HT-29) Cell Line.
- Author
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Tan BL, Norhaizan ME, and Chan LC
- Abstract
Magnetic iron oxide nanoparticles are among the most useful metal nanoparticles in biomedical applications. A previous study had confirmed that phytic acid-chitosan-iron oxide nanocomposite (Phy-CS-MNP) exhibited antiproliferative activity towards human colorectal cancer (HT-29) cells. Hence, in this work, we explored the in vitro cytotoxicity activity and mechanistic action of Phy-CS-MNP nanocomposite in modulating gene and protein expression profiles in HT-29 cell lines. Cell cycle arrest and apoptosis were evaluated by NovoCyte Flow Cytometer. The mRNA changes (cyclin-dependent kinase 4 ( Cdk4 ), vascular endothelial growth factor A ( VEGFA ), c-Jun N-terminal kinase 1 ( JNK1 ), inducible nitric oxide synthase ( iNOS ), and matrix metallopeptidase 9 ( MMP9 )) and protein expression (nuclear factor-kappa B ( NF-κB ) and cytochrome c) were assessed by quantitative real-time polymerase chain reaction (PCR) and western blotting, respectively. The data from our study demonstrated that treatment with Phy-CS-MNP nanocomposite triggered apoptosis and G₀/G₁ cell cycle arrest. The transcriptional activity of JNK1 and iNOS was upregulated after treatment with 90 μg/mL Phy-CS-MNP nanocomposite. Our results suggested that Phy-CS-MNP nanocomposite induced apoptosis and cell cycle arrest via an intrinsic mitochondrial pathway through modulation of Bax and Bcl-2 and the release of cytochrome c from the mitochondria into the cytosol.
- Published
- 2018
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37. Antioxidant and Oxidative Stress: A Mutual Interplay in Age-Related Diseases.
- Author
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Tan BL, Norhaizan ME, Liew WP, and Sulaiman Rahman H
- Abstract
Aging is the progressive loss of organ and tissue function over time. Growing older is positively linked to cognitive and biological degeneration such as physical frailty, psychological impairment, and cognitive decline. Oxidative stress is considered as an imbalance between pro- and antioxidant species, which results in molecular and cellular damage. Oxidative stress plays a crucial role in the development of age-related diseases. Emerging research evidence has suggested that antioxidant can control the autoxidation by interrupting the propagation of free radicals or by inhibiting the formation of free radicals and subsequently reduce oxidative stress, improve immune function, and increase healthy longevity. Indeed, oxidation damage is highly dependent on the inherited or acquired defects in enzymes involved in the redox-mediated signaling pathways. Therefore, the role of molecules with antioxidant activity that promote healthy aging and counteract oxidative stress is worth to discuss further. Of particular interest in this article, we highlighted the molecular mechanisms of antioxidants involved in the prevention of age-related diseases. Taken together, a better understanding of the role of antioxidants involved in redox modulation of inflammation would provide a useful approach for potential interventions, and subsequently promoting healthy longevity.
- Published
- 2018
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38. Montreal Cognitive Assessment as a screening instrument for cognitive impairments in schizophrenia.
- Author
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Yang Z, Abdul Rashid NA, Quek YF, Lam M, See YM, Maniam Y, Dauwels J, Tan BL, and Lee J
- Subjects
- Adult, Ambulatory Care, Cognition, Female, Humans, Male, ROC Curve, Schizophrenia drug therapy, Cognitive Dysfunction diagnosis, Cognitive Dysfunction etiology, Mental Status and Dementia Tests, Schizophrenia diagnosis, Schizophrenic Psychology
- Abstract
Background: Cognitive impairment is one of the core features of schizophrenia. For its evaluation, current clinical practice relies on detailed neuropsychological batteries which require trained testers and considerable amount of time to administer. Therefore, a brief and reliable screening tool for identification of overall cognitive impairment prior to a detailed comprehensive neurocognitive assessment is needed in a busy clinical setting. This study evaluates the clinical utility of the Montreal Cognitive Assessment (MoCA) in detecting cognitive impairments in schizophrenia and its relationship with functional outcome and demographic characters., Methods: The MoCA, the Brief Assessment of Cognition in Schizophrenia (BACS), and the Brief UCSD Performance-based Skills Assessment (UPSA-B) were administered to 64 patients with schizophrenia. Mild and severe cognitive impairments were defined as BACS Z-score (calculated with the age and gender adjustments using previously published local norm data) of one or two standard deviations below the mean, respectively., Results: The results showed that the MoCA was significantly correlated with BACS (r=.61, p<.001) and sensitive to detect both mild (AUC=0.82, p<.001) and severe (AUC=0.81, p<.001) cognitive impairments in schizophrenia. The MoCA was significantly correlated with UPSA-B score (r=.51, p<.001), and accounted for significant additional variance in UPSA-B score beyond the BACS., Conclusion: These findings indicate that MoCA is a useful bedside cognitive screening instrument for people with schizophrenia., (Copyright © 2018 The Authors. Published by Elsevier B.V. All rights reserved.)
- Published
- 2018
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39. ROS-Mediated Mitochondrial Pathway is Required for Manilkara Zapota (L.) P. Royen Leaf Methanol Extract Inducing Apoptosis in the Modulation of Caspase Activation and EGFR/NF- κ B Activities of HeLa Human Cervical Cancer Cells.
- Author
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Tan BL, Norhaizan ME, and Chan LC
- Abstract
Manilkara zapota (L.) P. Royen (family: Sapotaceae ) is commonly called sapodilla, or locally known as ciku . The detailed mechanisms underlying Manilkara zapota leaf methanol extract against HeLa human cervical cancer cells have yet to be investigated. Therefore, our present study is designed to investigate the ability to induce apoptosis and the underlying mechanisms of Manilkara zapota leaf methanol extract inducing cytotoxicity in HeLa cells. The apoptotic cell death was assessed using Annexin V-propidium iodide staining. Intracellular reactive oxygen species (ROS) and mitochondrial membrane potential activities were measured using dichlorodihydrofluorescein diacetate and MitoLite Orange, respectively, by NovoCyte Flow Cytometer. Bax and Bcl-2 expression were evaluated using Enzyme-Linked Immunosorbent Assay. Caspase-3 activity was determined using a colorimetric assay. The associated biological interaction pathways were evaluated using quantitative real-time PCR. Our data showed that HeLa cells were relatively more sensitive to Manilkara zapota leaf methanol extract than other cancer cell lines studied. Overall analyses revealed that Manilkara zapota leaf methanol extract can inhibit the viability of HeLa cells, induce mitochondrial ROS generation, and inhibit nuclear factor-kappa B (NF- κ B) and epidermal growth factor receptor ( EGFR ) transcriptional activities. Our results suggested that Manilkara zapota leaf methanol extract might represent a potential anticervical cancer agent.
- Published
- 2018
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40. Social cognitive interventions for people with schizophrenia: A systematic review.
- Author
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Tan BL, Lee SA, and Lee J
- Subjects
- Humans, Interpersonal Relations, Transcranial Direct Current Stimulation, Treatment Outcome, Schizophrenia therapy, Schizophrenic Psychology, Social Adjustment, Social Perception, Social Skills
- Abstract
Social cognition is the mental process which underpins social interactions. Increasingly, it has been recognized to be impaired in people with schizophrenia, resulting in functional problems. Correspondingly, the past ten years have seen huge developments in the study of interventions to ameliorate social cognitive deficits among people with schizophrenia. In the present review, we systematically reviewed published studies on social cognitive interventions from 2005 to 2015. Of the 61 studies included in this review, 20 were on broad-based social cognitive interventions, which incorporated neurocognitive training, specialized learning technique or virtual reality social skills training. On the other hand, 31 studies on targeted interventions either focused on specific social cognitive domains, or a range of domains. Improvements in emotion processing and theory of mind were often reported, while social perception and attributional style were less frequently measured. Both broad-based and targeted interventions achieved gains in social functioning, albeit inconsistently. Lastly, nine studies on the use of oxytocin and one study on transcranial direct current stimulation reported positive preliminary results in higher-order cognition and facial affect recognition respectively. This review revealed that a wide range of social cognitive interventions is currently available and most have shown some promise in improving social cognition outcomes. However, there is a need to use a common battery of measurements for better comparisons across interventions. Future research should examine combination therapies and the sustainability of gains beyond the intervention period., (Copyright © 2016 The Authors. Published by Elsevier B.V. All rights reserved.)
- Published
- 2018
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41. S-Nitrosylation of β-Arrestins Biases Receptor Signaling and Confers Ligand Independence.
- Author
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Hayashi H, Hess DT, Zhang R, Sugi K, Gao H, Tan BL, Bowles DE, Milano CA, Jain MK, Koch WJ, and Stamler JS
- Subjects
- Animals, Cell Line, Down-Regulation physiology, Female, HEK293 Cells, Humans, Inflammation metabolism, Ligands, Male, Mice, Mice, Inbred C57BL, Middle Aged, Nitric Oxide metabolism, RAW 264.7 Cells, Receptors, G-Protein-Coupled metabolism, Signal Transduction physiology, beta-Arrestins metabolism
- Abstract
Most G protein-coupled receptors (GPCRs) signal through both heterotrimeric G proteins and β-arrestins (βarr1 and βarr2). Although synthetic ligands can elicit biased signaling by G protein- vis-à-vis βarr-mediated transduction, endogenous mechanisms for biasing signaling remain elusive. Here we report that S-nitrosylation of a novel site within βarr1/2 provides a general mechanism to bias ligand-induced signaling through GPCRs by selectively inhibiting βarr-mediated transduction. Concomitantly, S-nitrosylation endows cytosolic βarrs with receptor-independent function. Enhanced βarr S-nitrosylation characterizes inflammation and aging as well as human and murine heart failure. In genetically engineered mice lacking βarr2-Cys253 S-nitrosylation, heart failure is exacerbated in association with greatly compromised β-adrenergic chronotropy and inotropy, reflecting βarr-biased transduction and β-adrenergic receptor downregulation. Thus, S-nitrosylation regulates βarr function and, thereby, biases transduction through GPCRs, demonstrating a novel role for nitric oxide in cellular signaling with potentially broad implications for patho/physiological GPCR function, including a previously unrecognized role in heart failure., (Copyright © 2018 Elsevier Inc. All rights reserved.)
- Published
- 2018
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42. Period Increase and Amplitude Distribution of Kink Oscillation of Coronal Loop.
- Author
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Su W, Guo Y, Erdélyi R, Ning ZJ, Ding MD, Cheng X, and Tan BL
- Abstract
Coronal loops exist ubiquitously in the solar atmosphere. These loops puzzle astronomers over half a century. Solar magneto-seismology (SMS) provides a unique way to constrain the physical parameters of coronal loops. Here, we study the evolution of oscillations of a coronal loop observed by the Atmospheric Imaging Assembly (AIA). We measure geometric and physical parameters of the loop oscillations. In particular, we find that the mean period of the oscillations increased from 1048 to 1264 s during three oscillatory cycles. We employ the differential emission measure method and apply the tools of SMS. The evolution of densities inside and outside the loop is analyzed. We found that an increase of density inside the loop and decrease of the magnetic field strength along the loop are the main reasons for the increase in the period during the oscillations. Besides, we also found that the amplitude profile of the loop is different from a profile would it be a homogeneous loop. It is proposed that the distribution of magnetic strength along the loop rather than density stratification is responsible for this deviation. The variation in period and distribution of amplitude provide, in terms of SMS, a new and unprecedented insight into coronal loop diagnostics.
- Published
- 2018
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43. Nutrients and Oxidative Stress: Friend or Foe?
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Tan BL, Norhaizan ME, and Liew WP
- Subjects
- Humans, Food, Oxidative Stress physiology
- Abstract
There are different types of nutritionally mediated oxidative stress sources that trigger inflammation. Much information indicates that high intakes of macronutrients can promote oxidative stress and subsequently contribute to inflammation via nuclear factor-kappa B- (NF- κ B-) mediated cell signaling pathways. Dietary carbohydrates, animal-based proteins, and fats are important to highlight here because they may contribute to the long-term consequences of nutritionally mediated inflammation. Oxidative stress is a central player of metabolic ailments associated with high-carbohydrate and animal-based protein diets and excessive fat consumption. Obesity has become an epidemic and represents the major risk factor for several chronic diseases, including diabetes, cardiovascular disease (CVD), and cancer. However, the molecular mechanisms of nutritionally mediated oxidative stress are complex and poorly understood. Therefore, this review aimed to explore how dietary choices exacerbate or dampen the oxidative stress and inflammation. We also discussed the implications of oxidative stress in the adipocyte and glucose metabolism and obesity-associated noncommunicable diseases (NCDs). Taken together, a better understanding of the role of oxidative stress in obesity and the development of obesity-related NCDs would provide a useful approach. This is because oxidative stress can be mediated by both extrinsic and intrinsic factors, hence providing a plausible means for the prevention of metabolic disorders.
- Published
- 2018
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44. Scientific Evidence of Rice By-Products for Cancer Prevention: Chemopreventive Properties of Waste Products from Rice Milling on Carcinogenesis In Vitro and In Vivo .
- Author
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Tan BL and Norhaizan ME
- Subjects
- Animals, Anticarcinogenic Agents chemistry, Dietary Fiber therapeutic use, Humans, Mice, Neoplasms diet therapy, Neoplasms pathology, Waste Products, Anticarcinogenic Agents therapeutic use, Carcinogenesis drug effects, Neoplasms prevention & control, Oryza chemistry
- Abstract
Cancer is a significant global health concern affecting men and women worldwide. Although current chemopreventive drugs could inhibit the growth of cancer cells, they exert many adverse side effects. Dietary factor plays a crucial role in the management of cancers and has drawn the attention of researchers to be used as an option to combat this disease. Both in vitro and in vivo studies showed that rice and its by-products display encouraging results in the prevention of this disease. The mechanism of anticancer effect is suggested partly through potentiation of bioactive compounds like vitamin E, phytic acid, γ -aminobutyric acid (GABA), γ -oryzanol, and phenolics. Nevertheless, the bioactivity of rice and its by-products is still incompletely understood. In this review, we present the findings from a preclinical study both in in vitro and in animal experiments on the promising role of rice by-products with focus on cancer prevention., Competing Interests: The authors declare that there are no competing interests regarding the publication of this paper.
- Published
- 2017
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45. Diagnosing an atypical site of giant cell arteritis with magnetic resonance angiography: a case report.
- Author
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Tan BL, Liu JJ, Yong TY, Tan CC, and Li JY
- Subjects
- Aged, Fever etiology, Giant Cell Arteritis diagnostic imaging, Giant Cell Arteritis drug therapy, Glucocorticoids therapeutic use, Headache etiology, Humans, Male, Temporal Arteries diagnostic imaging, Treatment Outcome, Anti-Inflammatory Agents toxicity, Giant Cell Arteritis pathology, Liver Function Tests methods, Magnetic Resonance Angiography, Prednisolone therapeutic use, Temporal Arteries pathology
- Abstract
Background: Giant cell arteritis typically involves the temporal arteries, but can involve other cranial arteries. Temporal artery biopsy is the mainstay for the diagnosis of giant cell arteritis; however, biopsy may be problematic if giant cell arteritis involves other cranial arteries that are inaccessible for sampling. In these situations, magnetic resonance angiography is a useful, non-invasive adjunctive method in the diagnosis of giant cell arteritis. In this case report, we describe a case of giant cell arteritis involving only the occipital artery which was revealed by magnetic resonance angiography., Case Presentation: A 67-year-old Caucasian man was admitted to our hospital with a 4-week history of malaise, fever, and mild occipital headaches. There were no other positive findings on physical examination. Laboratory studies were remarkable for normocytic anemia, raised inflammatory markers, and mildly deranged liver function tests. To exclude intracranial pathology, he underwent a cranial magnetic resonance imaging with gadolinium, which demonstrated a thickened wall and mural enhancement of his right occipital artery, consistent with giant cell arteritis. His temporal arteries were normal. His occipital arteries were not accessible for biopsy and he was commenced on high-dose prednisolone (60 mg daily). His symptoms resolved completely after a week of glucocorticoid steroid treatment and he was well on 5 mg of prednisolone once a day on follow-up., Conclusion: While magnetic resonance angiography may not replace the need for biopsy, it may have a diagnostic role in suspected giant cell arteritis, such as when the involved arteries are inaccessible for biopsy.
- Published
- 2016
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46. [Comparison of Six Flavonoid Components of Closely-Related Plants Agrimonia pilosa,Potentilla chinensis and Potentilla discolor].
- Author
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Sun Y, Wang Y, Tan BL, and Deng YR
- Subjects
- Acetonitriles, Chromatography, High Pressure Liquid, Drugs, Chinese Herbal, Flavonoids, Glucosides, Kaempferols, Luteolin, Quercetin analogs & derivatives, Rutin, Agrimonia, Potentilla
- Abstract
Objective: To establish an UHPLC method for simultaneous determination of six flavonoid components of three closelyrelated plants Agrimonia pilosa,Potentilla chinensis and Potentilla discolor including rutin,hyperoside,cynaroside,quercetin,apigenin and kaempferol. Meanwhile three fresh and dry plants were evaluated to compare the contents of six flavonoid components., Methods: The samples were pretreated with ultrasonic extraction with 70% ethanol for 0. 5 h. The analysis was performed on an Acquity HSS T3( 100 mm × 3. 0 mm,1. 8 μm) column with the mobile phase consisting of acetonitrile and 0. 3% glacial acetic acid aqueous at a flow rate of0. 4 m L / min. The detection wavelength was 360 nm,and the column temperature was 35 ℃., Results: The contents of rutin and hyperoside were high generally,but the content of kaempferol was extremely low in three closely-related plants. The content of apigenin was0. 028 mg / g in Potentilla chinensis,but not detected in Agrimonia pilosa and Potentilla discolor. The content of cymaroside in Agrimonia pilosa was significantly higher than that in Potentilla chinensis and Potentilla discolor. The fresh plants of Potentilla chinensis and Potentilla discolor contained more flavonoids than oven drying plants., Conclusion: The similar trend of content change from fresh to dry plant has showed a chemotaxonomic relationship of Potentilla chinensis and Potentilla discolor. The established determination method is simple,rapid and efficient,and is applicable for analysis of the contents of flavonoids in three closely-related plants,which provides the scientific basis for rationalization of using these drugs in clinic.
- Published
- 2016
47. Effectiveness of a day care program in supporting patients on peritoneal dialysis and their caregivers.
- Author
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Yu ZL, Seow YY, Seow PS, and Tan BL
- Subjects
- Aged, Aged, 80 and over, Clinical Competence, Female, Humans, Kidney Failure, Chronic psychology, Kidney Failure, Chronic therapy, Length of Stay, Male, Mental Health, Middle Aged, Patient Satisfaction, Peritonitis etiology, Personnel, Hospital education, Personnel, Hospital standards, Quality of Life, Caregivers psychology, Day Care, Medical psychology, Peritoneal Dialysis adverse effects, Respite Care psychology, Social Support
- Abstract
Purpose: Physical inactivity and social isolation are major problems faced by peritoneal dialysis (PD) patients. Respite care is also an unmet need for their caregivers. The study aimed to evaluate the benefits of day care service for PD patients., Method: Khoo Teck Puat Hospital collaborated with St Luke's Eldercare (SLEC) to provide day care services for PD patients. The day care provided assistance with two PD exchanges and activities for patients to maintain health and improve social interaction. Outcome indicators included: (1) enrollment status, length of stay and peritonitis rate; (2) quality of life and mental status evaluations on patients and caregivers with the 12-item Short-Form Health Survey, Hospital Anxiety and Depression Scale and Zarit Burden Interview Short-Form 12; and (3) qualitative data collected via interviews with patients, caregivers, healthcare providers and SLEC staff., Results: Sixty-four patients were referred, and 16 eventually participated. Mean age of participants was 67.2 (range 54-85) years. For patients who stayed >1 month (n = 9), length of stay was 205.0 days (58-428) and frequency of attendance was 2.9 (0.6-4.8) times/week. There were no peritonitis episodes while patients were in the program. Mental improvement was noticed for most patients and caregivers, but physical improvement was less obvious. Caregivers also felt less burden., Conclusions: Day care service is effective in alleviating the burden of caregivers and beneficial to patients with relatively good functional status. However, persuading patients and their caregivers to take up the program was a challenge.
- Published
- 2016
- Full Text
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48. Brewers' rice attenuated aberrant crypt foci developing in colon of azoxymethane-treated rats.
- Author
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Tan BL, Norhaizan ME, Pandurangan AK, Hazilawati H, and Roselina K
- Subjects
- Aberrant Crypt Foci chemically induced, Aberrant Crypt Foci pathology, Alanine Transaminase blood, Animals, Azoxymethane, Body Weight, Colorectal Neoplasms chemically induced, Colorectal Neoplasms pathology, Male, Oxidative Stress, Rats, Rats, Sprague-Dawley, Aberrant Crypt Foci prevention & control, Colorectal Neoplasms prevention & control, Oryza
- Abstract
Brewers' rice is one of abundant agricultural waste products in the rice industry. The present study is designed to investigate the potential of brewers' rice to inhibit the development of aberrant crypt foci (ACF) in colon of azoxymethane (AOM)-treated rats. The effects on the attenuation of hepatic toxicity and kidney function enzymes were also evaluated. Male Sprague-Dawley rats were randomly divided into five groups: (G1) normal; (G2) AOM alone; and (G3), (G4), and (G5), which were AOM fed with 10%, 20%, and 40% (w/w) of brewers' rice, respectively. The rats in group 2-5 were injected intraperitoneally with AOM (15 mg/kg body weight) once weekly for two weeks. After 8 weeks of treatment,the total number of ACF/colon and the number of ACF in the distal and middle colon were significantly reduced in all treatment groups compared to G2 (p<0.05). Brewers' rice decreased the number of ACF with dysplastic morphology in a dose-dependent manner. Alkaline phosphatase (ALP) level in G5 was significantly lower compared to the G2 (p<0.05). In conclusion, this study found the potential value of brewers' rice in reducing the risk of cancer susceptibility in colon.
- Published
- 2016
49. Brewers' rice modulates oxidative stress in azoxymethane-mediated colon carcinogenesis in rats.
- Author
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Tan BL, Norhaizan ME, Huynh K, Yeap SK, Hazilawati H, and Roselina K
- Subjects
- Animals, Carcinogenesis chemically induced, Carcinogenesis genetics, Colon metabolism, Colonic Neoplasms chemically induced, Colonic Neoplasms genetics, Colonic Neoplasms metabolism, Disease Models, Animal, Gene Expression Regulation, Neoplastic, Glycogen Synthase Kinase 3 genetics, Glycogen Synthase Kinase 3 metabolism, Glycogen Synthase Kinase 3 beta, Heme Oxygenase (Decyclizing) genetics, Heme Oxygenase (Decyclizing) metabolism, Male, Malondialdehyde metabolism, NF-E2-Related Factor 2 genetics, NF-E2-Related Factor 2 metabolism, NF-kappa B genetics, NF-kappa B metabolism, Nitric Oxide metabolism, Nitric Oxide Synthase Type II genetics, Nitric Oxide Synthase Type II metabolism, Rats, Sprague-Dawley, Superoxide Dismutase metabolism, Transcription, Genetic, Transcriptional Activation, Wnt Signaling Pathway, beta Catenin genetics, beta Catenin metabolism, Antioxidants pharmacology, Azoxymethane, Carcinogenesis metabolism, Colon drug effects, Colonic Neoplasms prevention & control, Dietary Supplements, Oryza, Oxidative Stress drug effects, Plant Preparations pharmacology
- Abstract
Aim: To investigate the mechanistic action of brewers' rice in regulating the Wnt/nuclear factor-kappa B (NF-κB)/Nrf2-signaling pathways during colon carcinogenesis in male Sprague-Dawley rats., Methods: Male Sprague-Dawley rats were randomly divided into the following five groups (six rats in each group): (G1) normal, (G2) azoxymethane (AOM) alone, (G3) AOM + 10% (weight (w)/weight (w)) brewers' rice, (G4) AOM + 20% (w/w) brewers' rice, and (G5) AOM + 40% (w/w) brewers' rice. They were intraperitoneally administered 15 mg/kg body weight of AOM in saline once weekly over a two-week period and treated with an American Institute of Nutrition (AIN)-93G diet containing 10%, 20%, and 40% (w/w) brewers' rice. The mRNA levels of glycogen synthase kinase 3β (GSK3β), β-catenin, key inflammation markers, nuclear factor E2-related factor 2 (Nrf2), and heme oxygenase-1 (HO-1)-dependent transcriptional activity were assessed by quantitative real-time polymerase chain reaction analyses. The colon superoxide dismutase, malondialdehyde, and nitric oxide levels were also analyzed to assess the antioxidant effect of these treatments. The results were analyzed using one-way analysis of variance (ANOVA), and a P value of < 0.05 was considered significant., Results: The overall analyses demonstrated that the dietary administration of brewers' rice in AOM-induced rat colon carcinogenesis resulted in the transcriptional upregulation of GSK3β, inducible nitric oxide synthase (iNOS), Nrf2, and HO-1. We discovered that the dietary administration of brewers' rice downregulated the β-catenin and NF-κB mRNA levels. A significant reduction in β-catenin expression was found in the groups administered with 20% (0.611 ± 0.034) and 40% (0.436 ± 0.045) (w/w) brewers' rice compared with that of the group treated with AOM alone (1.000 ± 0.064) (P < 0.05). The NF-κB expression was significantly lower between the AOM-alone group (1.000 ± 0.048) and those groups fed with diets containing 10% (w/w) brewers' rice (0.255 ± 0.022), 20% (w/w) brewers' rice (0.450 ± 0.045), or 40% (w/w) brewers' rice (0.541 ± 0.027) (P < 0.05). Brewers' rice improved the antioxidant levels, indicating that brewers' rice can enhance effective recovery from oxidative stress induced by AOM., Conclusion: Our results provide evidence that brewers' rice can suppress colon cancer via the regulation of Nrf2 expression and the inhibition of the Wnt/NF-κB signaling pathways.
- Published
- 2015
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50. Water extract of brewers' rice induces apoptosis in human colorectal cancer cells via activation of caspase-3 and caspase-8 and downregulates the Wnt/β-catenin downstream signaling pathway in brewers' rice-treated rats with azoxymethane-induced colon carcinogenesis.
- Author
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Tan BL, Norhaizan ME, Huynh K, Heshu SR, Yeap SK, Hazilawati H, and Roselina K
- Subjects
- Animals, Azoxymethane adverse effects, Colorectal Neoplasms chemically induced, HT29 Cells, Humans, Rats, Caspase 3 metabolism, Caspase 8 metabolism, Colorectal Neoplasms metabolism, Oryza chemistry, Plant Extracts pharmacology, Wnt Signaling Pathway drug effects
- Abstract
Background: Brewers' rice, is locally known as temukut, is a mixture of broken rice, rice bran, and rice germ. The current study is an extension of our previous work, which demonstrated that water extract of brewers' rice (WBR) induced apoptosis in human colorectal cancer (HT-29) cells. We also identified that brewers' rice was effective in reducing the tumor incidence and multiplicity in azoxymethane (AOM)-injected colon cancer rats. Our present study was designed to identify whether WBR confers an inhibitory effect via the regulation of upstream components in the Wnt signaling pathway in HT-29 cells. To further determine whether the in vitro mechanisms of action observed in the HT-29 cells inhibit the downstream signaling target of the Wnt/β-catenin pathway, we evaluated the mechanistic action of brewers' rice in regulating the expressions and key protein markers during colon carcinogenesis in male Sprague-Dawley rats., Methods: The mRNA levels of several upstream-related genes in the Wnt signaling pathway in HT-29 cells treated with WBR were determined by quantitative real-time PCR analyses. Caspase-3 and -8 were evaluated using a colorimetric assay. Male Sprague-Dawley rats were administered two intraperitoneal injections of AOM in saline (15 mg/kg body weight) over a two-week period and received with 10, 20, and 40% (w/w) brewers' rice. The expressions and protein levels of cyclin D1 and c-myc were evaluated by immunohistochemical staining and western blotting, respectively., Results: The overall analyses revealed that the treatment of HT-29 cells with WBR inhibited Wnt signaling activity through upregulation of the casein kinase 1 (CK1) and adenomatous polyposis coli (APC) mRNA levels. We discovered that the treatment of HT-29 cells with WBR resulted in the induction of apoptosis by the significant activation of caspase-3 and -8 activities compared with the control (P < 0.05). In vivo analyses indicated that brewers' rice diminished the β-catenin, cyclin D1, and c-myc protein levels., Conclusions: We provide evidence that brewers' rice can induce apoptosis and inhibit the proliferation of HT-29 cells through regulation of caspase-dependent pathways and inhibit the Wnt/β-catenin downstream signaling pathway in vivo. We suggest that brewers' rice may be a useful dietary agent for colorectal cancer.
- Published
- 2015
- Full Text
- View/download PDF
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