46 results on '"Cheng WN"'
Search Results
2. A HEALTH SURVEY OF WORKERS IN THE PENTACHLOROPHENOL SECTION OF A CHEMICAL MANUFACTURING PLANT
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CHENG, WN, COENRAADS, PJ, HAO, ZH, LIU, GF, and Public Health Research (PHR)
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PENTACHLOROPHENOL PROCESSING ,PCDFS ,CHLORACNE ,TCDD ,PCDDS ,P-DIOXIN ,INTOXICATION ,2,4,5-TRICHLOROPHENOXYACETIC ACID ,EXPERIENCE ,CHEMICAL MANUFACTURING ,PORPHYRIA CUTANEA-TARDA ,POLYCHLORINATED DIBENZOFURANS - Abstract
During 1968 to 1985, 109 workers who had been engaged in the production of pentachlorophenol, using non-gamma isomers of hexachloroclohexane (BHC) as the raw material, were surveyed. Endemic chloracne among them had been noted since 1974. The prevalence of chloracne was 73.4% (80/109) in total and 95.2% (20/21) in a trichlorobenzene (TCB) tank area where dioxin and dibenzofurans levels were thousands of ppm. To our knowledge, PCDDs and PCDFs have not previously been reported from thermal decomposition of BHC. Urinary porphyrins were significantly higher among exposed workers than among the controls but there was no significant difference between the workers with chloracne and those without. The conduction velocities of the median motor nerves were much slower among the workers in the TCB tank area where the highest PCDDs contamination appeared. The mortality study cohort was relatively young. Based on the three deaths observed during the follow-up, no association could be drawn. (C) 1993 Wiley-Liss, Inc.
- Published
- 1993
3. High-Entropy Transition Metal Phosphorus Trichalcogenides for Rapid Sodium Ion Diffusion.
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Huang S, Qiu Z, Zhong J, Wu S, Han X, Hu W, Han Z, Cheng WN, Luo Y, Meng Y, Hu Z, Zhou X, Guo S, Zhu J, Zhao X, and Li CC
- Abstract
High-entropy strategies are regarded as a powerful means to enhance performance in energy storage fields. The improved properties are invariably ascribed to entropy stabilization or synergistic cocktail effect. Therefore, the manifested properties in such multicomponent materials are usually unpredictable. Elucidating the precise correlations between atomic structures and properties remains a challenge in high-entropy materials (HEMs). Herein, atomic-resolution scanning transmission electron microscopy annular dark field (STEM-ADF) imaging and four dimensions (4D)-STEM are combined to directly visualize atomic-scale structural and electric information in high-entropy FeMnNiVZnPS
3 . Aperiodic stacking is found in FeMnNiVZnPS3 accompanied by high-density strain soliton boundaries (SSBs). Theoretical calculation suggests that the formation of such structures is attributed to the imbalanced stress of distinct metal-sulfur bonds in FeMnNiVZnPS3 . Interestingly, the electric field concentrates along the two sides of SSBs and gradually diminishes toward the two-dimensional (2D) plane to generate a unique electric field gradient, strongly promoting the ion-diffusion rate. Accordingly, high-entropy FeMnNiVZnPS3 demonstrates superior ion-diffusion coefficients of 10-9.7 -10-8.3 cm2 s-1 and high-rate performance (311.5 mAh g-1 at 30 A g-1 ). This work provides an alternative way for the atomic-scale understanding and design of sophisticated HEMs, paving the way for property engineering in multi-component materials., (© 2024 Wiley‐VCH GmbH.)- Published
- 2024
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4. Continuous Positive Airway Pressure Treatment and Hypertensive Adverse Outcomes in Pregnancy: A Systematic Review and Meta-Analysis.
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Lee YC, Chang YC, Tseng LW, Lin WN, Lu CT, Lee LA, Fang TJ, Cheng WN, and Li HY
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- Humans, Pregnancy, Female, Adult, Pre-Eclampsia, Hypertension, Pregnancy-Induced epidemiology, Pregnancy Outcome epidemiology, Continuous Positive Airway Pressure methods, Sleep Apnea, Obstructive therapy, Sleep Apnea, Obstructive complications
- Abstract
Importance: Pregnancy may contribute to the development or exacerbation of obstructive sleep apnea (OSA) and increase the risk of gestational complications. Continuous positive airway pressure (CPAP) is the first-line and criterion standard treatment for OSA and is regarded as the most feasible choice during pregnancy. However, the association between CPAP therapy in pregnant women with OSA and reduced gestational complications remains inconclusive., Objective: To investigate the association between CPAP therapy in pregnant women with OSA and the reduction of adverse hypertensive outcomes during gestation., Data Sources: Keyword searches of PubMed, Embase, and the Cochrane Database of Systematic Reviews and Clinical Trials were conducted from inception to November 5, 2023., Study Selection: Original studies reporting the treatment effect of CPAP use on lowering hypertension and preeclampsia risks in pregnant women with OSA were selected., Data Extraction and Synthesis: The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guideline was followed in the reporting of reviews. Data were independently extracted by 2 authors. Random-effects model meta-analyses were performed and risk ratios (RRs) reported. Subgroup analysis, meta-regression based on age and body mass index (BMI; calculated as weight in kilograms divided by height in meters squared), and publication bias assessment were also conducted., Main Outcome and Measures: The primary outcome was the RR of gestational hypertension and preeclampsia between pregnant women with OSA receiving CPAP treatment and those who did not receive CPAP treatment., Results: Six original studies in 809 participants (mean age, 31.4 years; mean BMI, 34.0) were identified and systematically reviewed for meta-analysis. The pooled results showed significant differences between the intervention (CPAP use) and the control (non-CPAP use) groups in reducing the risk of gestational hypertension (RR, 0.65; 95% CI, 0.47-0.89; P = .008) and preeclampsia (RR, 0.70; 95% CI, 0.50-0.98; P = .04). Meta-regression revealed that patients' age (coefficient, -0.0190; P = .83) and BMI (coefficient, -0.0042; P = .87) were not correlated with reduction of risk of hypertension and preeclampsia., Conclusions and Relevance: These findings suggest that implementing CPAP treatment in pregnant women with OSA may reduce the risk of gestational hypertension and preeclampsia.
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- 2024
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5. Engineering Charge Density Waves by Stackingtronics in Tantalum Disulfide.
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Cheng WN, Niu M, Meng Y, Han X, Qiao J, Zhang J, and Zhao X
- Abstract
In the realm of condensed matter physics and materials science, charge density waves (CDWs) have emerged as a captivating way to modulate correlated electronic phases and electron oscillations in quantum materials. However, collectively and efficiently tuning CDW order is a formidable challenge. Herein, we introduced a novel way to modulate the CDW order in 1T-TaS
2 via stacking engineering. By introducing shear strain during the electrochemical exfoliation, the thermodynamically stable AA-stacked TaS2 consecutively transform into metastable ABC stacking, resulting in unique 3 a × 1 a CDW order. By decoupling atom coordinates, we atomically deciphered the 3D subtle structural variations in trilayer samples. As suggested by density functional theory (DFT) calculations, the origin of CDWs is presumably due to collective excitations and charge modulation. Therefore, our works shed light on a new avenue to collectively modulate the CDW order via stackingtronics and unveiled novel mechanisms for triggering CDW formation via charge modulation.- Published
- 2024
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6. Pharmacotherapy for obstructive sleep apnea - A systematic review and meta-analysis of randomized controlled trials.
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Lee YC, Lu CT, Chuang LP, Lee LA, Fang TJ, Cheng WN, and Li HY
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- Humans, Male, Randomized Controlled Trials as Topic, Continuous Positive Airway Pressure, Norepinephrine therapeutic use, Sleep Apnea, Obstructive therapy
- Abstract
Continuous positive airway pressure is the first-line and gold-standard treatment for obstructive sleep apnea (OSA). Pharmacotherapy is not commonly used in treating OSA until recently. Combined noradrenergic and antimuscarinic agents have been clinically applied for OSA patients with variable results. This meta-analysis study aimed to investigate the efficacy of the combined regimen on OSA. A systematic literature search was performed up to November 2022 for the effects of the combined regimen on OSA. Eight randomized controlled trials were identified and systematically reviewed for meta-analysis. There were significant mean differences between OSA patients taking a combined regimen and placebo in apnea-hypopnea index (AHI) [mean difference (MD) -9.03 events/h, 95%CI (-16.22, -1.83 events/h; P = 0.01] and lowest oxygen saturation [MD 5.61%, 95% CI % (3.43, 7.80); P < 0.01]. Meta-regression showed that a higher proportion of male participants was associated with a greater reduction of AHI (p = 0.04). This study showed a positive but modest effect of pharmacotherapy in the reduction of OSA severity. The combination drugs are most applicable to male OSA patients based on their efficacy and pharmacological susceptibility. Pharmacotherapy may be applied as an alternative, adjunctive or synergistic treatment under careful consideration of its side effects., Competing Interests: Declaration of competing interest The named authors have no conflicts of interest, financial or otherwise., (Copyright © 2023 The Authors. Published by Elsevier Ltd.. All rights reserved.)
- Published
- 2023
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7. Palatal hybrid surgery for obstructive sleep apnea-state-of-the-art annotation of uvulopalatopharyngoplasty.
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Li HY, Tsai MS, Lee LA, Hsin LJ, Lee YC, Lin WN, Lu YA, Shen SC, Cheng WN, and Chaing YT
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- Adult, Humans, Palate, Soft surgery, Pharynx surgery, Sleep, Treatment Outcome, Uvula surgery, Sleep Apnea, Obstructive surgery
- Abstract
Background: Surgery for obstructive sleep apnea (OSA) has changed in concept and technique that transformed from radical excision to functional reconstruction. The aim of this study was to investigate the safety and effectiveness of palatal hybrid surgery in OSA patients., Methods: Palatal hybrid surgery is a tissue-specific technique (mucosa-preservation, tonsil-excision, fat-ablation, muscle-relocation/suspension) used in treating OSA patients with velopharyngeal obstruction. The study included 46 consecutive adults OSA patients. The palatal hybrid surgery annotates uvulopalatopharyngoplasty in stereoscopic reconstruction of tonsillar fossa (pharyngoplasty), omni-suspension of the soft palate (palatoplasty) and advancement of uvula (uvuloplasty)., Results: No patient experienced airway compromise, voice change or persistent nasal regurgitation following palatal hybrid surgery. One patient existed postoperative tonsillar fossa bleeding received conservative treatment. Postoperative pain in visual analogue scale (VAS) showed average score of 3, 3, 2, 0 at the 1st, 3rd, 7th, 14th day, respectively. Perioperative snoring severity (VAS) (8.7 vs 2.6) and daytime sleepiness (Epworth Sleepiness Scale) (11.3 vs 5.5) all improved significantly (p < 0.001). Posterior air space in retropalatal area increased from 8.4 to 11.1 mm (p < 0.001). Home sleep test showed that apnea-hypopnea index significantly reduced from 41.8 to 18.2 event/h and minimal oxygen saturation increased from 72.4 to 81.5% (p < 0.001). The success rate in individual Friedman stage was 100% (stage I), 63% (stage II) and 58% (stage III) with a total success rate of 63%., Conclusion: Palatal hybrid surgery using tissue-specific maneuver annotates UPPP in concept and technique. The results show that palatal hybrid surgery is mini-invasive with low morbid and is effective in improving subjective clinic symptoms, objective sleep parameters and success rate of OSA., Competing Interests: Conflicts of interest The authors have declared that no conflicts of interest exists., (Copyright © 2022 Chang Gung University. Published by Elsevier B.V. All rights reserved.)
- Published
- 2023
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8. Combined Airway and Bariatric Surgery (CABS) for Obstructive Sleep Apnea Patients with Morbid Obesity: A Comprehensive Alternative Preliminary Study.
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Lin CC, Liu KH, Lee LA, Chuang LP, Lin YS, Hsin LJ, Lin WN, Chiang YT, Cheng WN, and Li HY
- Abstract
Although continuous positive airway pressure is the gold standard for obstructive sleep apnea (OSA), it does not improve obesity. By contrast, bariatric surgery significantly improves obesity but with sustained OSA in the majority of patients. This study proposes a comprehensive technique—combined airway and bariatric surgery (CABS)—to improve both obesity and OSA. The aims of the study are to evaluate the feasibility, safety and efficacy of CABS in morbidly obese OSA patients. The retrospective study enrolled 20 morbidly obese OSA patients (13 males; median age, 44 years; median apnea−hypopnea index (AHI), 63.2 event/h; median body mass index (BMI), 41.4 kg/m2). The study population was divided into two groups based on patients’ volition after shared decision making. The bariatric surgery (BS) group included laparoscopic sleeve gastrectomy (LSG, n = 8) and laparoscopic Roux-en-Y gastric bypass (LRYGB, n = 2). CABS involved bariatric surgery—LSG (n = 8) and LRYGB (n = 2) in conjunction with airway surgery (concurrent nasal/palatal/lingual surgery [n = 8], concurrent palatal/lingual surgery [n = 2]). Patients received a home sleep apnea test at baseline and one year after surgery. The two patient groups were not different in age, sex, preoperative AHI or preoperative BMI. There was no airway compromise, wound bleeding or infection throughout the postoperative period. One year after surgery, patients in both groups achieved significant improvement in AHI and BMI. Furthermore, the improvement in AHI was significantly higher (p = 0.04) in the CABS group than in the BS group despite the insignificant change in BMI reduction (p = 0.63) between the two groups. In the CABS group, the BMI dropped from 40.4 to 28.4 kg/m2 (p < 0.0001) and the AHI decreased from 75.1 to 4.5 event/h (p = 0.0004). The classic success rate for OSA was 90% and the cure rate was 60% in the CABS group. A perioperative assessment of CABS group patients also revealed a significant improvement in the Epworth sleepiness scale, minimal O2 saturation, snoring index and heart rate. CABS is feasible and safe in treating OSA with morbid obesity. CABS achieves more reduction in AHI than BS alone with high success and cure rates for OSA. CABS can also significantly improve quality of life and general health and offers a comprehensive alternative for morbidly obese OSA patients., Competing Interests: The authors have declared that no conflict of interest exist.
- Published
- 2022
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9. The Impact of Mouth-Taping in Mouth-Breathers with Mild Obstructive Sleep Apnea: A Preliminary Study.
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Lee YC, Lu CT, Cheng WN, and Li HY
- Abstract
Background: Many patients with obstructive sleep apnea (OSA) are mouth-breathers. Mouth-breathing not only narrows the upper airway, consequently worsening the severity of OSA, but also it affects compliance with nasal continuous positive airway pressure (CPAP) treatment. This study aimed to investigate changes in OSA by the use of mouth tape in mouth-breathers with mild OSA., Method: Mouth-breathers with mild OSA who met inclusion criteria and tolerated the sealing of the mouth were enrolled in the study. We used 3M silicone hypoallergenic tape was used to seal the mouths of the participants during sleep. The home sleep test (HST) used in this study was ApneaLink
® . Subjects received both a baseline HST and an outcome HST to be used 1 week later while their mouths were taped. The changes between the baseline and the outcome HSTs were compared, and the factors that influenced the differences in the sleep-test parameters after the shift of the breathing route were analyzed. A "responder" was defined as a patient who experienced a reduction from the baseline snoring index of at least 50% under mouth-taping in the HST; otherwise, patients were considered as having a poor response., Results: A total of 20 patients with mild OSA were included. Following the taping of the mouth, a good response was found in 13 patients (65%). The median apnea/hypopnea index (AHI) decreased significantly, from 8.3 to 4.7 event/h (by 47%, p = 0.0002), especially in supine AHI (9.4 vs. 5.5 event/h, p = 0.0001). The median snoring index (SI) was also improved (by 47%, 303.8 vs. 121.1 event/h, p = 0.0002). Despite no significant difference in the mean saturation, improvements in the oxygen desaturation index (8.7 vs. 5.8, p = 0.0003) and the lowest saturation (82.5% vs. 87%, p = 0.049) were noted. The change in AHI was associated with baseline AHI (r = -0.52, p = 0.02), oxygen desaturation index (ODI) (r = -0.54, p = 0.01), and SI (r = -0.47, p = 0.04). The change in SI was strongly associated with baseline SI (r = -0.77, p = 0.001)., Conclusions: Mouth-taping during sleep improved snoring and the severity of sleep apnea in mouth-breathers with mild OSA, with AHI and SI being reduced by about half. The higher the level of baseline AHI and SI, the greater the improvement was shown after mouth-taping. Mouth-taping could be an alternative treatment in patients with mild OSA before turning to CPAP therapy or surgical intervention.- Published
- 2022
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10. Transoral Tongue Suspension for Obstructive Sleep Apnea-A Preliminary Study.
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Hsin LJ, Lee YC, Lin WN, Lu YA, Lee LA, Tsai MS, Cheng WN, Chiang YT, and Li HY
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Objectives: To evaluate the safety and efficacy of a novel technique for transoral tongue suspension (TOTS) in obstructive sleep apnea (OSA) patients. Material and Methods: The retrospective study enrolled 24 consecutive OSA patients (21 males; average age, 43 years; average apnea−hypopnea index (AHI), 42.2 event/h; average body mass index (BMI), 25.7 kg/m2) with tongue obstruction confirmed by drug-induced sleep endoscopy. All patients received TOTS as the main procedure in conjunction with uvulopalatopharyngoplasty (UPPP). Key procedures of TOTS included a transoral sublabial approach, drilling two holes on the mandible, passing the polypropylene through the hole to the tongue base using a suture passer and returning the polypropylene through loop traction, and tying the polypropylene to the mandible. Lingual tonsil ablation (n = 8) was also implemented in hypertrophic lingual tonsils (grades III and IV). Results: The operation time for TOTS was around 30 min. No wound bleeding or airway compromise occurred throughout the postoperative period. Minor complications were temporary and included swelling of the tongue, numbness of the lower incisor, and sublabial wound dehiscence (n = 2). The quality of life improved significantly in the patients’ subjective daytime sleepiness according to the Epworth Sleepiness Scale (11.4 ± 3.2 vs. 5.7 ± 1.6, p < 0.001). The objective parameters of OSA also improved significantly in the apnea/hypopnea index (42.2 ± 21.8 vs. 19.5 ± 16.2, p < 0.001), minimal oxygen saturation (77.1 ± 12.2 vs. 81.7 ± 8.1, p = 0.026), and snoring index (207 ± 141 vs. 101 ± 91, p = 0.03). Conclusions: The demonstrated TOTS showed its advantage in low morbidity with a scarless exterior and easy performance with free availability in treating adult OSA patients with tongue obstruction. TOTS combined with UPPP significantly improved AHI and daytime sleepiness. TOTS can be implemented with lingual tonsillectomy to achieve both stabilization of the tongue and widening of hypopharyngeal airway.
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- 2022
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11. Quality characteristics of yogurts fermented with short-chain fatty acid-producing probiotics and their effects on mucin production and probiotic adhesion onto human colon epithelial cells.
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Chang YH, Jeong CH, Cheng WN, Choi Y, Shin DM, Lee S, and Han SG
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- Animals, Colon, Epithelial Cells, Fatty Acids, Volatile, Fermentation, Humans, Mucins, Streptococcus thermophilus, Probiotics, Yogurt
- Abstract
Probiotics can ferment nondigestible carbohydrates and produce short-chain fatty acids (SCFA; acetate, propionate, and butyrate) in the human colon. In this study, the levels of SCFA were determined in the following yogurts fermented with different combinations of probiotics: (1) cocultures of Streptococcus thermophilus and Lactobacillus bulgaricus (control, C); (2) S. thermophilus, L. bulgaricus, and Bifidobacterium bifidum (C-Bb); (3) S. thermophilus, L. bulgaricus, and Lactobacillus acidophilus (C-La); and (4) S. thermophilus, L. bulgaricus, and Lactobacillus gasseri (C-Lg). Results showed that the acetate levels were significantly higher in C-Bb, C-La, and C-Lg yogurts than in C yogurt. Fermentation and physicochemical characteristics of all yogurts were identical. Treatment of mucus-secreting colon epithelial cells (HT29-MTX) with C-Bb, C-La, and C-Lg yogurt supernatants resulted in an increase in the expression of MUC2 and CDX2 and the production of mucin proteins. The adhesion of probiotics onto HT29-MTX cells increased following treatment with C-Bb, C-La, and C-Lg yogurt supernatants. Our data suggest that a yogurt diet rich in acetate improves the protective function of the intestinal epithelium., (Copyright © 2021 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.)
- Published
- 2021
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12. Bovine mastitis: risk factors, therapeutic strategies, and alternative treatments - A review.
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Cheng WN and Han SG
- Abstract
Bovine mastitis, an inflammation of the mammary gland, is the most common disease of dairy cattle causing economic losses due to reduced yield and poor quality of milk. The etiological agents include a variety of gram-positive and gram-negative bacteria, and can be either contagious (e.g., Staphylococcus aureus, Streptococcus agalactiae, Mycoplasma spp.) or environmental (e.g., Escherichia coli, Enterococcus spp., coagulase-negative Staphylococcus, Streptococcus uberis). Improving sanitation such as enhanced milking hygiene, implementation of post-milking teat disinfection, maintenance of milking machines are general measures to prevent new cases of mastitis, but treatment of active mastitis infection is dependant mainly on antibiotics. However, the extensive use of antibiotics increased concerns about emergence of antibiotic-resistant pathogens and that led the dairy industries to reduce the use of antibiotics. Therefore, alternative therapies for prevention and treatment of bovine mastitis, particularly natural products from plants and animals, have been sought. This review provides an overview of bovine mastitis in the aspects of risk factors, control and treatments, and emerging therapeutic alternatives in the control of bovine mastitis.
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- 2020
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13. p38γ overexpression promotes osteosarcoma cell progression.
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Shi C, Cheng WN, Wang Y, Li DZ, Zhou LN, Zhu YC, and Zhou XZ
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Osteosarcoma (OS) is the most common primary bone malignancy in the adolescent population. Recent studies demonstrate that p38 gamma (p38γ) phosphorylates retinoblastoma (Rb) to promote cyclin expression, cell-cycle entry and tumorigenesis. Studying the potential function of p38γ in human OS, we show that p38 γ mRNA and protein expression are significantly elevated in OS tissues and OS cells, whereas its expression is relatively low in normal bone tissue and in human osteoblasts/osteoblastic cells. Knockdown of p38γ in established (U2OS) and primary human OS cells potently inhibited cell growth, proliferation, migration and invasion, while promoting cell apoptosis. Furthermore, CRISPR/Cas9-induced p38γ knockout inhibited human OS cell progression in vitro . Conversely, ectopic overexpression of p38γ in primary human OS cells augmented cell growth, proliferation and migration. Signaling studies show that retinoblastoma (Rb) phosphorylation and cyclin E1/cyclin A expression were decreased following p38γ shRNA knockdown and knockout, but increased after ectopic p38γ overexpression. Collectively, these results show that p38γ overexpression promotes human OS cell progression.
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- 2020
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14. Risk of Alzheimer's Disease in Obstructive Sleep Apnea Patients With or Without Treatment: Real-World Evidence.
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Tsai MS, Li HY, Huang CG, Wang RYL, Chuang LP, Chen NH, Liu CH, Yang YH, Liu CY, Hsu CM, Cheng WN, and Lee LA
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- Adult, Alzheimer Disease etiology, Databases, Factual, Female, Humans, Incidence, Male, Middle Aged, Proportional Hazards Models, Retrospective Studies, Risk Factors, Sleep Apnea, Obstructive therapy, Taiwan epidemiology, Treatment Outcome, Alzheimer Disease epidemiology, Continuous Positive Airway Pressure statistics & numerical data, Otorhinolaryngologic Surgical Procedures statistics & numerical data, Sleep Apnea, Obstructive psychology
- Abstract
Objective: To assess the risk of Alzheimer's disease (AD) in patients with obstructive sleep apnea (OSA) with or without treatment based on real-world evidence., Study Design: Retrospective cohort study., Methods: Patients newly diagnosed with OSA during 1997-2012 were identified using the National Health Insurance Research Database of Taiwan. Patients without OSA were randomly selected and matched in a 1:4 ratio by age, sex, urbanization level, and income. All patients were followed up until death or the end of 2013. The primary outcome was AD occurrence., Results: This study included 3,978 OSA patients and 15,912 non-OSA patients. OSA was independently and significantly associated with a higher incidence of AD in an adjusted Cox proportional hazard model (adjusted hazard ratio: 2.12; 95% confidence interval [CI], 1.27-3.56). The average period of AD detection from the time of OSA occurrence was 5.44 years (standard deviation: 2.96). Subgroup analyses revealed that the effect of OSA remained significant in patients aged ≥60 years, male subgroups, patients without CPAP or surgical treatment, and patients without pharmacological therapies. Patients with OSA who received treatment (continuous positive airway pressure or surgery) exhibited a significantly reduced risk of AD compared with those without treatment (incidence rate ratio 0.23, 95% CI, 0.06-0.98)., Conclusion: OSA is independently associated with an increased risk of AD. Treatment for OSA reduces the AD risk in OSA patients. AD irreversibility renders OSA as a potential modifiable target for slowing or preventing the process of AD development., Level of Evidence: IV Laryngoscope, 130:2292-2298, 2020., (© 2020 The American Laryngological, Rhinological and Otological Society, Inc.)
- Published
- 2020
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15. Molecular and functional characterization of three odorant-binding proteins from the wheat blossom midge, Sitodiplosis mosellana.
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Cheng WN, Zhang YD, Liu W, Li GW, and Zhu-Salzman K
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- Amino Acid Sequence, Animals, Diptera, Female, Insect Proteins chemistry, Insect Proteins metabolism, Phylogeny, Receptors, Odorant chemistry, Receptors, Odorant metabolism, Sequence Alignment, Insect Proteins genetics, Receptors, Odorant genetics
- Abstract
Sitodiplosis mosellana, a periodic but devastating wheat pest, relies on wheat spike volatiles as a cue in selecting hosts for oviposition. Insect odorant-binding proteins (OBPs) are thought to play essential roles in filtering, binding and transporting hydrophobic odorant molecules to specific receptors. To date, the molecular mechanisms underlying S. mosellana olfaction are poorly understood. Here, three S. mosellana antenna-specific OBP genes, SmosOBP11, 16 and 21, were cloned and bacterially expressed. Binding properties of the recombinant proteins to 28 volatiles emitted from wheat spikes were investigated using fluorescence competitive binding assays. Sequence analysis suggested that these SmosOBPs belong to the Classic OBP subfamily. Ligand-binding analysis showed that all three SmosOBPs preferentially bound alcohol, ester and ketone compounds, and SmosOBP11 and 16 also selectively bound terpenoid compounds. In particular, the three SmosOBPs had high binding affinities (K
i < 20 μmol/L) to 3-hexanol and cis-3-hexenylacetate that elicited strong electroantennogram (EAG) response from female antennae. In addition, SmosOBP11 displayed significantly higher binding (Ki < 8 μmol/L) than SmosOBP16 and 21 to 1-octen-3-ol, D-panthenol, α-pinene and heptyl acetate which elicited significant EAG response, suggesting that SmosOBP11 plays a major role in recognition and transportation of these volatiles. These findings have provided important insight into the molecular mechanism by which S. mosellana specifically recognizes plant volatiles for host selection, and have facilitated identification of effective volatile attractants that are potentially useful for pest monitoring and trapping., (© 2019 Institute of Zoology, Chinese Academy of Sciences.)- Published
- 2020
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16. Short communication: Effects of moringa extract on adhesion and invasion of Escherichia coli O55 in bovine mammary epithelial cells.
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Cheng WN, Jeong CH, Kim DH, and Han SG
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- Animals, Anti-Bacterial Agents pharmacology, Cattle, Enterococcus faecalis, Epithelial Cells microbiology, Escherichia coli Infections veterinary, Female, Mastitis, Bovine microbiology, Anti-Bacterial Agents isolation & purification, Bacterial Adhesion drug effects, Escherichia coli drug effects, Mammary Glands, Animal microbiology, Moringa chemistry, Plant Extracts pharmacology
- Abstract
The objective of this study was to evaluate the antibacterial activities of extract derived from moringa leaves. In particular, the effect of moringa extract (Mor) on adhesion and invasion of Escherichia coli O55, Enterococcus faecalis, Staphylococcus simulans, and Serratia liquefaciens was evaluated in bovine mammary epithelial cells (MAC-T). Broth microdilution method, minimum inhibitory concentration and minimum bactericidal concentration assays, adhesion and invasion assays, and real-time PCR were performed. The minimum inhibitory concentration and minimum bactericidal concentration of Mor ranged from 12.5 to 50 mg/mL on 18 out of 27 tested isolates. Treatment of E. coli O55 with Mor (100 and 200 μg/mL) inhibited the adhesion and invasion on MAC-T cells via downregulation of adhesion factors (i.e., papC, f17c-A, and eaeA). Also, when MAC-T cells were pretreated with Mor (200 μg/mL, 12 h) and incubated with E. coli O55, Enterococcus faecalis, Staphylococcus simulans, or Serratia liquefaciens, both E. coli O55 and Enterococcus faecalis showed a significant decrease in adhesion and invasion. Staphylococcus simulans exhibited decreased adhesion and increased invasion. Serratia liquefaciens showed increased adhesion and decreased invasion. In addition, Mor increased mRNA expression of antioxidant enzymes (e.g., heme oxygenase-1, NAD(P)H:quinone oxidoreductase-1, and thioredoxin reductase 1) in MAC-T cells. In conclusion, 12.5 to 50 mg/mL of Mor exhibited antibacterial activity against 18 out of 27 tested isolates. Also, pretreatment of 200 μg/mL of Mor to MAC-T cells modulated adhesion and invasion of E. coli O55 and other mastitis-associated pathogens. Furthermore, Mor increased antioxidant capacities in MAC-T cells, but further in vivo studies are needed., (Copyright © 2020 American Dairy Science Association. Published by Elsevier Inc. All rights reserved.)
- Published
- 2020
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17. Aluminum exposure promotes the metastatic proclivity of human colorectal cancer cells through matrix metalloproteinases and the TGF-β/Smad signaling pathway.
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Jeong CH, Kwon HC, Cheng WN, Kim DH, Choi Y, and Han SG
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- Colorectal Neoplasms enzymology, Colorectal Neoplasms metabolism, Epithelial-Mesenchymal Transition drug effects, HT29 Cells, Humans, Neoplasm Metastasis, Aluminum Chloride toxicity, Colorectal Neoplasms pathology, Matrix Metalloproteinase 7 metabolism, Matrix Metalloproteinase 8 metabolism, Signal Transduction drug effects, Smad2 Protein metabolism, Smad3 Protein metabolism, Transforming Growth Factor beta metabolism
- Abstract
Human exposure to aluminum (Al) mainly occurs through food intake. However, influences of Al on the gastrointestinal tract have been rarely reported. In particular, the effect of Al on the metastasis and angiogenesis of colorectal cancer cells has not been studied. Thus, we investigated the effect of Al on the metastatic proclivity using the human colorectal cancer cell line, HT-29. Cells were exposed to 1-16 mM AlCl
3 for 3-72 h. The effects of AlCl3 on HT-29 cells for migration/invasion/adhesion, and metastasis-associated protein and gene expression were evaluated. AlCl3 promoted cell migration and invasion, whereas it suppressed cell adhesion. AlCl3 -exposed cells showed decreased E-cadherin and increased vimentin and Snail. AlCl3 increased transforming growth factor-beta (TGF-β) mRNA expression and Smad2/3 nuclear translocation. AlCl3 -treated cells had a higher mRNA expression of matrix metalloproteinase (MMP)-7 and -9 than the control. Particularly, AlCl3 -treated HT-29 cells promoted the angiogenesis of endothelial cells via increasing the secretion of vascular endothelial growth factor. Taken together, AlCl3 can promote the metastatic proclivity of colorectal cancer cells through MMP-7, -9, and TGF-β/Smad2/3 pathway. Our data suggest that Al exposure of the gastrointestinal tract may be a risk factor for metastasis initiation in colorectal cancer cells., Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper., (Copyright © 2020 Elsevier Ltd. All rights reserved.)- Published
- 2020
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18. How to manage continuous positive airway pressure (CPAP) failure -hybrid surgery and integrated treatment.
- Author
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Li HY, Lee LA, Tsai MS, Chen NH, Chuang LP, Fang TJ, Shen SC, and Cheng WN
- Subjects
- Combined Modality Therapy, Humans, Pharynx physiopathology, Pharynx surgery, Plastic Surgery Procedures, Sleep Apnea, Obstructive physiopathology, Sleep Apnea, Obstructive therapy, Treatment Failure, Continuous Positive Airway Pressure adverse effects, Otorhinolaryngologic Surgical Procedures methods, Sleep Apnea, Obstructive surgery
- Abstract
Obstructive sleep apnea (OSA) is a prevalent disease, which influences social relations and quality of life with major health impact. The etiology of OSA is multi-factorial involving both anatomical obstruction and physiological collapse of the upper airway during sleep with different proportion in individual patients. Continuous positive airway pressure (CPAP) is the gold standard and first-line treatment for OSA patients. The mechanism of CPAP is acting as air splint to avoid principal pharyngeal collapse during sleep. Consequently, extrapharyngeal collapse and significant pharyngeal obstructions can lower its compliance and lead to its failure. Adequate mask and pressure with thorough survey to eliminate side effects of CPAP from nasal, mask and flow-related problems are the prerequisite to improve CPAP compliance. For CPAP failure patients, multi-dimensional surgery is an alternative and salvage treatment that involves soft tissue surgery, skeletal surgery, and bariatric surgery. OSA patients with craniofacial anomaly are suggested to skeletal surgery. By contrast, OSA patients with pathological obesity are referred to bariatric surgery. Soft tissue surgery targets at the nose, soft palate, lateral pharyngeal wall, tongue and epiglottis that can be implemented by multi-level surgery with hybrid technique (mucosa-preservation, fat-ablation, muscle-suspension, tonsil-excision, cartilage-reconstruction) to maximize surgical outcomes and minimize complications. Some evolution in surgical concept and technique are noteworthy that include mini-invasive septoturbinoplasty, palatal suspension instead of excision, whole tongue treatment, and two-dimensional supraglottoplasty. Postoperative integrated treatment including myofunctional, positional therapy and body weight control reduces relapse of OSA and improves long-term treatment outcomes., (Copyright © 2020. Published by Elsevier B.V.)
- Published
- 2020
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19. Cloning and characterization of Methoprene-tolerant (Met) and Krüppel homolog 1 (Kr-h1) genes in the wheat blossom midge, Sitodiplosis mosellana.
- Author
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Cheng WN, Li XJ, Zhao JJ, and Zhu-Salzman K
- Subjects
- Amino Acid Sequence, Animals, Base Sequence, Basic Helix-Loop-Helix Transcription Factors, Culicomorpha growth & development, Culicomorpha metabolism, Diapause, Insect, Drosophila Proteins, Female, Insect Proteins metabolism, Juvenile Hormones metabolism, Kruppel-Like Transcription Factors, Male, Culicomorpha genetics, Insect Proteins genetics
- Abstract
Juvenile hormone (JH), a growth regulator, inhibits ecdysteroid-induced metamorphosis and controls insect development and diapause. Methoprene-tolerant (Met) and Krüppel homolog 1 (Kr-h1) are two proteins involved in JH action. To gain some insight into their function in development of Sitodiplosis mosellana, an insect pest undergoing obligatory larval diapause at the mature 3rd instar stage, we cloned full-length complementary DNAs of Met and Kr-h1 from this species. SmMet encoded a putative protein, which contained three domains typical of the bHLH-PAS family and eight conserved amino acid residues important for JH binding. SmKr-h1 encoded a protein showing high sequence homology to its counterparts in other species, and contained all eight highly conserved Zn-finger motifs for DNA-binding. Expression patterns of SmMet and SmKr-h1 were developmentally regulated and JH III responsive as well. Their mRNA abundance increased as larvae entered early 3rd instar, pre-diapause and maintenance stages, and peaked during post-diapause quiescence, a pattern correlated with JH titers in this species. Different from reduced expression of SmMet, SmKr-h1 mRNA increased at mid-to-late period of post-diapause development. Topical application of JH III on diapausing larvae also induced the two genes in a dose-dependent manner. Expression of SmMet and SmKr-h1 clearly declined in the pre-pupal phase, and was significantly higher in female adults than male adults. These results suggest that JH-responsive SmMet and SmKr-h1 might play key roles in diapause induction and maintenance as well as in post-diapause quiescence and adult reproduction, whereas metamorphosis from larvae to pupae might be correlated with their reduced expression., (© 2018 Institute of Zoology, Chinese Academy of Sciences.)
- Published
- 2020
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20. Keap1-targeting microRNA-941 protects endometrial cells from oxygen and glucose deprivation-re-oxygenation via activation of Nrf2 signaling.
- Author
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Li SP, Cheng WN, Li Y, Xu HB, Han H, Li P, and Zhang DX
- Subjects
- Adult, Cell Survival, Cells, Cultured, Endometrium pathology, Female, Humans, Oxidative Stress, Primary Cell Culture, Endometrium metabolism, Kelch-Like ECH-Associated Protein 1 metabolism, MicroRNAs physiology, NF-E2-Related Factor 2 metabolism, Reperfusion Injury metabolism
- Abstract
Background: Mimicking ischemia-reperfusion injury, oxygen and glucose deprivation (OGD)-re-oxygenation (OGDR) applied to endometrial cells produces significant oxidative stress and programmed necrosis, which can be inhibited by nuclear-factor-E2-related factor 2 (Nrf2) signaling. MicroRNA (miRNA)-induced repression of Keap1, a Nrf2 suppressor protein that facilitates Nrf2 degradation, is novel strategy to activate Nrf2 cascade., Methods: MicroRNA-941 (miR-941) was exogenously expressed in HESC and primary human endometrial cells, and the Nrf2 pathway examined by Western blotting and real-time quantitative PCR analysis. The endometrial cells were treated with OGDR, cell programmed necrosis and apoptosis were tested., Results: MiR-941 is a novel Keap1-targeting miRNA that regulates Nrf2 activity. In T-HESC cells and primary human endometrial cells, ectopic overexpression of miR-941 suppressed Keap1 3'-UTR (untranslated region) expression and downregulated its mRNA/protein expression, leading to activation of the Nrf2 cascade. Conversely, inhibition of miR-941 elevated Keap1 expression and activity in endometrial cells, resulting in suppression of Nrf2 activation. MiR-941 overexpression in endometrial cells attenuated OGDR-induced oxidative stress and programmed necrosis, whereas miR-941 inhibition enhanced oxidative stress and programmed necrosis. MiR-941 overexpression and inhibition were completely ineffective in Keap1-/Nrf2-KO T-HESC cells (using CRISPR/Cas9 strategy). Restoring Keap1 expression, using an UTR-depleted Keap1 construct, abolished miR-941-induced anti-OGDR activity in T-HESC cells. Thus Keap1-Nrf2 cascade activation is required for miR-941-induced endometrial cell protection., Conclusions: Targeting Keap1 by miR-941 activates Nrf2 cascade to protect human endometrial cells from OGDR-induced oxidative stress and programmed necrosis. Video Abstract.
- Published
- 2020
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21. Effects of Aluminum on the Integrity of the Intestinal Epithelium: An in Vitro and in Vivo Study.
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Jeong CH, Kwon HC, Kim DH, Cheng WN, Kang S, Shin DM, Yune JH, Yoon JE, Chang YH, Sohn H, and Han SG
- Subjects
- Animals, Intestinal Mucosa drug effects, Mice, Mice, Inbred C57BL, NF-kappa B metabolism, Tight Junction Proteins metabolism, Tight Junctions drug effects, Toxicity Tests, Tumor Necrosis Factor-alpha metabolism, Aluminum toxicity, Environmental Pollutants toxicity
- Abstract
Background: Aluminum (Al) is the most abundant and ubiquitous metal in the environment. The main route of human exposure to Al is through food and water intake. Although human exposure to Al is common, the influence of Al on the gastrointestinal tract remains poorly understood., Objectives: We aimed to further understand the toxic effect of Al and to elucidate the underlying cellular mechanisms in the intestinal barrier., Methods: The human intestinal epithelial cell line HT-29 and C57BL6 mice were exposed to AlCl 3 at 0 - 16 mM ( 1 - 24 h ) and 5 - 50 mg / kg body weight (13 weeks), respectively. In cell culture experiments, intracellular oxidative stress, inflammatory protein and gene expression, and intestinal epithelial permeability were measured. In animal studies, histological examination, gene expression, and myeloperoxidase (MPO) activity assays were conducted., Results: Cellular oxidative stress level (superoxide production) in AlCl 3 -treated cells ( 4 mM , 3 h ) was approximately 38-fold higher than that of the control. Both protein and mRNA expression of tight junction (TJ) components (occludin and claudin-1) in AlCl 3 -treated cells ( 1 - 4 mM , 24 h ) was significantly lower than that of the control. Transepithelial electrical resistance (TEER) decreased up to 67% in AlCl 3 -treated cells ( 2 mM , 24 h ) compared with that of the control, which decreased approximately 7%. Al activated extracellular signal-regulated kinase 1/2 and nuclear factor-kappa B ( NF- κ B ), resulting in mRNA expression of matrix metalloproteinase-9, myosin light-chain kinase, and inflammatory cytokines [tumor necrosis factor alpha ( TNF- α ), interleukin- 1 β ( IL- 1 β ), and IL-6] in HT-29 cells. Moreover, oral administration of AlCl 3 to mice induced pathological alteration, MPO activation, and inflammatory cytokine ( TNF- α , IL- 1 β , and IL-6) production in the colon., Conclusion: Al induced epithelial barrier dysfunction and inflammation via generation of oxidative stress, down-regulation of the TJ proteins, and production of inflammatory cytokines in HT-29 cells. In addition, Al induced toxicity in the colon by increasing the levels of inflammatory cytokines and MPO activity and induced histological damage in a mouse model. Our data suggest that Al may be a potential risk factor for human intestinal diseases. https://doi.org/10.1289/EHP5701.
- Published
- 2020
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22. Zearalenone Induces Endoplasmic Reticulum Stress and Modulates the Expression of Phase I/II Enzymes in Human Liver Cells.
- Author
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Yoon JE, Lee KY, Seok JS, Cheng WN, Kwon HC, Jeong CH, and Han SG
- Subjects
- Apoptosis drug effects, Autophagy drug effects, Cell Death drug effects, Cell Survival drug effects, Chemical and Drug Induced Liver Injury enzymology, Chemical and Drug Induced Liver Injury metabolism, Chemical and Drug Induced Liver Injury pathology, Endoplasmic Reticulum Chaperone BiP, Hep G2 Cells, Humans, Liver drug effects, Reactive Oxygen Species, Endoplasmic Reticulum Stress drug effects, Enzymes biosynthesis, Liver enzymology, Mycotoxins toxicity, Zearalenone toxicity
- Abstract
Zearalenone (ZEN) is a mycotoxin produced by Fusarium species; however, its mechanisms of action in human livers have not been fully elucidated. Thus, we investigated the toxic mechanisms of ZEN in human liver cells. HepG2 cells were treated with ZEN (0-40 μg/mL) for up to 24 h. A significant decrease in cell viability was observed after treatment with 20 and 40 μg/mL of ZEN, including a significant increase in apoptosis and reactive oxygen species production. ZEN increased GRP78 and CHOP, and eIF2α phosphorylation, indicating ER stress; elevated transcription of the autophagy-associated genes, beclin1 and LC3, and translation of LC3; and increased phase I metabolism by increasing PXR and CYP3A4. The protein expression level of CYP3A4 was higher with ZEN treatment up to 20 μg/mL, but remained at the control level after treatment with 40 μg/mL ZEN. In phase II metabolism, Nrf2 activation and UGT1A expression were increased with ZEN treatment up to 20 μg/mL. Treating cells with an ER stress inhibitor alleviated ZEN-induced cell death and autophagy, and inhibited the expression of phase I/II enzymes. Overall, high ZEN concentrations can modulate the expression of phase I/II enzymes via ER stress and reduced protein levels in human liver cells., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2019
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23. Piperlongumine Induces Cell Cycle Arrest via Reactive Oxygen Species Accumulation and IKKβ Suppression in Human Breast Cancer Cells.
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Jeong CH, Ryu H, Kim DH, Cheng WN, Yoon JE, Kang S, and Han SG
- Abstract
Piperlongumine (PL), a natural product derived from long pepper (Piper longum L.), is known to exhibit anticancer effects. However, the effect of PL on cell cycle-regulatory proteins in estrogen receptor (ER)-positive breast cancer cells is unclear. Therefore, we investigated whether PL can modulate the growth of ER-positive breast cancer cell line, MCF-7. We found that PL decreased MCF-7 cell proliferation and migration. Flow cytometric analysis demonstrated that PL induced G2/M phase cell cycle arrest. Moreover, PL significantly modulated the mRNA levels of cyclins B1 and D1, cyclin-dependent kinases 1, 4, and 6, and proliferating cell nuclear antigen. PL induced intracellular reactive oxygen species (hydrogen peroxide) accumulation and glutathione depletion. PL-mediated inhibition of IKKβ expression decreased nuclear translocation of NF-κB p65. Furthermore, PL significantly increased p21 mRNA levels. In conclusion, our data suggest that PL exerts anticancer effects in ER-positive breast cancer cells by inhibiting cell proliferation and migration via ROS accumulation and IKKβ suppression.
- Published
- 2019
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24. Alterations in Alzheimer's Disease-Associated Gene Expression in Severe Obstructive Sleep Apnea Patients.
- Author
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Li HY, Tsai MS, Huang CG, Wang RYL, Chuang LP, Chen NH, Liu CH, Hsu CM, Cheng WN, and Lee LA
- Abstract
Background: Obstructive sleep apnea (OSA) increases the risk of Alzheimer's disease (AD), and inflammation may be involved in the early pathogenesis of AD in patients with OSA. However, the potential pathways between OSA and AD have yet to be established. In this study, we aimed to investigate differential expressions of AD-associated genes in OSA patients without evident AD or dementia., Methods: This prospective case-control study included five patients with severe OSA and five age and sex-matched patients with non-severe OSA without evident dementia who underwent uvulopalatopharyngoplasty between 1 January 2013 and 31 December 2015. The expressions of genes associated with AD were analyzed using whole-exome sequencing. Unsupervised two-dimensional hierarchical clustering was performed on these genes. Pearson's correlation was used as the distance metric to simultaneously cluster subjects and genes., Results: The expressions of CCL2 , IL6 , CXCL8 , HLA-A , and IL1RN in the patients with severe OSA were significantly different from those in the patients with non-severe OSA and contributed to changes in the immune response, cytokine-cytokine receptor interactions, and nucleotide-binding oligomerization domain-like receptor signaling pathways., Conclusions: Inflammation may contribute to the onset of AD and physicians need to be aware of the potential occurrence of AD in patients with severe OSA.
- Published
- 2019
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25. Moringa Extract Attenuates Inflammatory Responses and Increases Gene Expression of Casein in Bovine Mammary Epithelial Cells.
- Author
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Cheng WN, Jeong CH, Seo HG, and Han SG
- Abstract
Bovine mastitis is a common inflammatory disease in the udder of dairy cows that causes economic loss to dairy industries. The development of alternative strategies, especially the utilization of natural products, e.g. Moringa oleifera , has gained a lot of interests. The objective of the current study was to investigate the protective effects of moringa extract (ME) in bovine mammary epithelial cells (MAC-T) in in vitro settings. Radical scavenging capacities and anti-inflammatory properties of ME were examined using lipopolysaccharide (LPS)-challenged MAC-T cells. ME showed significant radical scavenging activities. In addition, ME decreased reactive oxygen species produced by LPS in cells. ME also attenuated inflammatory cyclooxygenase-2 expression induced by LPS by down-regulating NF-κB signaling cascade. Moreover, ME ameliorated LPS-induced pro-inflammatory cytokines including tumor necrosis factor-, interleukin-1, and interleukin-6. Furthermore, ME up-regulated mRNA expression levels of heme oxygenase-1, NAD(P)H: quinone oxidoreductase-1, and thioredoxin reductase 1. Importantly, ME promoted differentiated MAC-T cells by increasing mRNA expression levels of α-casein S1, α-casein S2, and β-casein. In conclusion, ME has beneficial effects in bovine mammary epithelial cells through its anti-inflammatory, antioxidant, and casein production properties. Our study provides evidence that ME could be a good candidate for a feed supplement to decrease inflammatory responses due to bovine mastitis., Competing Interests: The authors declare no conflict of interest.
- Published
- 2019
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26. Fluconazole induces rapid high-frequency MTL homozygosis with microbiological polymorphism in Candida albicans.
- Author
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Ou TY, Chang FM, Cheng WN, Lara A, Chou ML, Lee WF, Lee KC, Lin CT, Lee WS, Yu FL, and Su CH
- Subjects
- Candida albicans isolation & purification, Drug Resistance, Fungal genetics, Fungal Proteins genetics, Fungal Proteins metabolism, Gene Frequency, Humans, Microbial Sensitivity Tests, Polymerase Chain Reaction, Polymorphism, Genetic drug effects, Polymorphism, Genetic genetics, Antifungal Agents pharmacology, Candida albicans drug effects, Candida albicans genetics, Fluconazole pharmacology, Genes, Mating Type, Fungal drug effects, Genes, Mating Type, Fungal genetics
- Abstract
Background: Candida albicans, a common fungal pathogen that can cause opportunistic infections, is regarded as an apparently asexual, diploid fungus. A parasexual cycle was previously found between homozygotes with opposite mating type-like loci (MTLa/α). Fluconazole-resistant strains had a higher proportion of MTL homozygotes, whereas MTL homozygous C. albicans was found in only about 3.2% of clinical strains. MTL heterozygotes had a low frequency (1.4 × 10
-4 ) of white-opaque switching to MTL homozygotes in nature., Methods: Here, a reference C. albicans strain (SC5314) was used in a fluconazole-induced assay to obtain standard opaque MTL homozygous strains and first-generation daughter strains from the fluconazole inhibition zone. Further separation methods were employed to produce second- and third-generation daughter strains. Polymerase chain reaction analysis based on MTL genes was used to define MTL genotypes, and microscopic observations, a flow-cytometric assay, and an antifungal E-test were used to compare microbiological characteristics., Results: MTL homozygotes were found at a high frequency (17 of 35; 48.6%) in fluconazole-induced first-generation daughter strains, as were morphological polymorphisms, decreased DNA content, and modified antifungal drug susceptibility. High-frequency MTL homozygosity was identified inside the fluconazole inhibition zone within 24 hours. The DNA content of fluconazole-induced daughter strains was reduced compared with their progenitor SC5314 and standard MTL homozygous strains., Conclusion: Treatment with fluconazole, commonly used to treat invasive candidiasis, inhibited the growth of C. albicans and altered its microbiological characteristics. Our results suggest that fluconazole treatment induces the high frequency of loss of heterozygosity and microbiological polymorphism in C. albicans., (Copyright © 2016. Published by Elsevier B.V.)- Published
- 2017
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27. Oxidative stress-induced inflammatory responses and effects of N-acetylcysteine in bovine mammary alveolar cells.
- Author
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Bae H, Jeong CH, Cheng WN, Hong K, Seo HG, and Han SG
- Subjects
- Animals, Cattle, Cells, Cultured, Cyclooxygenase 2 analysis, Epithelial Cells drug effects, Epithelial Cells physiology, Female, Humans, Inflammation etiology, MAP Kinase Signaling System drug effects, MAP Kinase Signaling System physiology, NF-kappa B antagonists & inhibitors, NF-kappa B physiology, Proto-Oncogene Proteins c-akt antagonists & inhibitors, Proto-Oncogene Proteins c-akt physiology, Reactive Oxygen Species pharmacology, Vitamin K 3 pharmacology, Acetylcysteine administration & dosage, Mammary Glands, Animal cytology, Mastitis, Bovine etiology, Mastitis, Bovine prevention & control, Oxidative Stress physiology
- Abstract
Bovine mastitis, an inflammation of the udder, results in reduced milk production and poor milk quality. Mastitis is usually, but not always, a response to pathogen infection. High milk yield can produce oxidative stress in the mammary tissue. High milk yield is also known to be associated with bovine mastitis. Thus, in the current study, we hypothesised that oxidative stress increases inflammatory responses in bovine mammary cells. To examine the hypothesis, we produced cellular oxidative stress and investigated resulting inflammatory responses in bovine mammary alveolar cells (MAC-T). To produce oxidative stress, cells were treated with the reactive oxygen species (ROS; e.g., superoxide anion)-producing agent, menadione (MD; 0-10 µm; 6 h). To ensure the ROS-induced responses, cells were pretreated with an antioxidant NAC (0-10 mm; 1 h). Results showed that MD elevated intracellular ROS levels and protein expression of cyclooxygenase-2 (COX-2), a biomarker of inflammation. Pretreatment of cells with NAC attenuated MD-induced COX-2 expression by scavenging intracellular ROS and enhancing intracellular glutathione levels. MD-induced COX-2 expression was mediated by activation of extracellular signal receptor-activated kinase 1/2 (ERK1/2), Akt, and nuclear factor-kappa B (NF-κB). NAC attenuated activation of these intracellular signalling molecules. Treatment of cells with pharmacological inhibitors for ERK1/2, Akt, and NF-κB confirmed the association of these signalling pathways in MD-induced COX-2 expression. These results support our hypothesis that oxidative stress, which is found in high-yielding dairy cows, can produce cellular inflammation in bovine mammary alveolar cells and prevention of oxidative stress can attenuate such pathological responses. This may be relevant for cases of clinical mastitis for which no pathogen can be isolated.
- Published
- 2017
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28. Bee Venom Decreases LPS-Induced Inflammatory Responses in Bovine Mammary Epithelial Cells.
- Author
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Jeong CH, Cheng WN, Bae H, Lee KW, Han SM, Petriello MC, Lee HG, Seo HG, and Han SG
- Subjects
- Animals, Cattle, Cell Line drug effects, Cell Survival drug effects, Cyclooxygenase 2 metabolism, Cytokines metabolism, Female, Interleukin-6 metabolism, MAP Kinase Signaling System drug effects, Mastitis drug therapy, NF-kappa B metabolism, Signal Transduction drug effects, Transcription Factors drug effects, Tumor Necrosis Factor-alpha metabolism, Anti-Inflammatory Agents pharmacology, Bee Venoms pharmacology, Epithelial Cells drug effects, Inflammation chemically induced, Inflammation drug therapy, Lipopolysaccharides adverse effects
- Abstract
The world dairy industry has long been challenged by bovine mastitis, an inflammatory disease, which causes economic loss due to decreased milk production and quality. Attempts have been made to prevent or treat this disease with multiple approaches, primarily through increased abuse of antibiotics, but effective natural solutions remain elusive. Bee venom (BV) contains a variety of peptides ( e.g. , melittin) and shows multiple bioactivities, including prevention of inflammation. Thus, in the current study, it was hypothesized that BV can reduce inflammation in bovine mammary epithelial cells (MAC-T). To examine the hypothesis, cells were treated with LPS (1 μg/ml) to induce an inflammatory response and the anti-inflammatory effects of BV (2.5 and 5 μg/ml) were investigated. The cellular mechanisms of BV against LPS-induced inflammation were also investigated. Results showed that BV can attenuate expression of an inflammatory protein, COX2, and pro-inflammatory cytokines such as IL-6 and TNF-α. Activation of NF-κB, an inflammatory transcription factor, was significantly downregulated by BV in cells treated with LPS, through dephosphorylation of ERK1/2. Moreover, pretreatment of cells with BV attenuated LPS-induced production of intracellular reactive oxygen species ( e.g. , superoxide anion). These results support our hypothesis that BV can decrease LPS-induced inflammatory responses in bovine mammary epithelial cells through inhibition of oxidative stress, NF-κB, ERK1/2, and COX-2 signaling.
- Published
- 2017
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29. Morphology, Ultrastructure and Possible Functions of Antennal Sensilla of Sitodiplosis mosellana Géhin (Diptera: Cecidomyiidae).
- Author
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Wang Y, Li D, Liu Y, Li XJ, Cheng WN, and Zhu-Salzman K
- Subjects
- Animals, Arthropod Antennae ultrastructure, Diptera physiology, Female, Male, Mechanoreceptors ultrastructure, Microscopy, Electron, Scanning, Microscopy, Electron, Transmission, Olfactory Perception, Sensilla ultrastructure, Sex Characteristics, Diptera ultrastructure
- Abstract
To better understand the olfactory receptive mechanisms involved in host selection and courtship behavior of Sitodiplosis mosellana (Diptera: Cecidomyiidae), one of the most important pests of wheat, scanning and transmission electron microscopy were used to examine the external morphology and ultrastructure of the antennal sensilla. The moniliform antennae exhibit obvious sexual dimorphism: antennae of the males are markedly longer than those of the females. Furthermore, each male flagellomere consists of two globular nodes, whereas each female flagellomere is cylindrical. Seven types of sensilla were identified in both sexes. Two types of s. chaetica have a lumen without dendrites and thick walls, suggesting that they are mechanoreceptors. S. trichodea and s. circumfila are typical chemoreceptors, possessing thin multiporous walls encircling a lumen with multiple dendrites. There are significantly more s. trichodea in female than in male, which may be related to host plant localization. In contrast, male s. circumfila are highly elongated compared to those of females, perhaps for pheromone detection. Peg-shaped s. coeloconica are innervated with unbranched dendrites extending from the base to the distal tip. Type 1 s. coeloconica, which have deep longitudinal grooves and finger-like projections on the surface, may serve as olfactory or humidity receptors, whereas type 2 s. coeloconica, smooth with a terminal pore, may be contact chemoreceptors. Also, this is the first report of Böhm' bristles at proximal scape on antennae of Cecidomyiid species potentially functioning as mechanoreceptors., (© The Author 2016. Published by Oxford University Press on behalf of the Entomological Society of America.)
- Published
- 2016
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30. Snoring Sounds Predict Obstruction Sites and Surgical Response in Patients with Obstructive Sleep Apnea Hypopnea Syndrome.
- Author
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Lee LA, Lo YL, Yu JF, Lee GS, Ni YL, Chen NH, Fang TJ, Huang CG, Cheng WN, and Li HY
- Subjects
- Adult, Female, Humans, Male, Middle Aged, Prospective Studies, Sleep Apnea Syndromes surgery, Sleep Apnea, Obstructive surgery, Snoring surgery, Treatment Outcome, Sleep Apnea Syndromes diagnosis, Sleep Apnea Syndromes pathology, Sleep Apnea, Obstructive diagnosis, Sleep Apnea, Obstructive pathology, Snoring diagnosis, Snoring pathology, Sound Spectrography methods
- Abstract
Snoring sounds generated by different vibrators of the upper airway may be useful indicators of obstruction sites in patients with obstructive sleep apnea hypopnea syndrome (OSAHS). This study aimed to investigate associations between snoring sounds, obstruction sites, and surgical responses (≥50% reduction in the apnea-hypopnea index [AHI] and <10 events/hour) in patients with OSAHS. This prospective cohort study recruited 36 OSAHS patients for 6-hour snoring sound recordings during in-lab full-night polysomnography, drug-induced sleep endoscopy (DISE), and relocation pharyngoplasty. All patients received follow-up polysomnography after 6 months. Fifteen (42%) patients with at least two complete obstruction sites defined by DISE were significantly, positively associated with maximal snoring sound intensity (40-300 Hz; odds ratio [OR], 1.25, 95% confidence interval [CI] 1.05-1.49) and body mass index (OR, 1.48, 95% CI 1.02-2.15) after logistic regression analysis. Tonsil obstruction was significantly, inversely correlated with mean snoring sound intensity (301-850 Hz; OR, 0.84, 95% CI 0.74-0.96). Moreover, baseline tonsil obstruction detected by either DISE or mean snoring sound intensity (301-850 Hz), and AHI could significantly predict the surgical response. Our findings suggest that snoring sound detection may be helpful in determining obstruction sites and predict surgical responses.
- Published
- 2016
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31. The Frequency and Energy of Snoring Sounds Are Associated with Common Carotid Artery Intima-Media Thickness in Obstructive Sleep Apnea Patients.
- Author
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Lee GS, Lee LA, Wang CY, Chen NH, Fang TJ, Huang CG, Cheng WN, and Li HY
- Subjects
- Adult, Blood Pressure, C-Reactive Protein metabolism, Humans, Male, Sleep Apnea, Obstructive blood, Sleep Apnea, Obstructive diagnostic imaging, Sleep Apnea, Obstructive physiopathology, Carotid Artery, Common diagnostic imaging, Carotid Artery, Common physiopathology, Carotid Intima-Media Thickness, Snoring blood, Snoring diagnostic imaging, Snoring physiopathology
- Abstract
Obstructive sleep apnea (OSA) is a known risk factor for atherosclerosis. We investigated the association of common carotid artery intima-media thickness (CCA-IMT) with snoring sounds in OSA patients. A total of 30 newly diagnosed OSA patients with no history of cardiovascular diseases were prospectively enrolled for measuring mean CCA-IMT with B-mode ultrasonography, body mass index, metabolic syndrome, 10-year cardiovascular disease risk score, high-sensitivity C-reactive protein, and homocysteine. Good-quality signals of full-night snoring sounds in an ordinary sleep condition obtained from 15 participants were further acoustically analyzed (Included group). All variables of interest were not significantly different (all p > 0.05) between the included and non-included groups except for diastolic blood pressure (p = 0.037). In the included group, CCA-IMT was significantly correlated with snoring sound energies of 0-20 Hz (r = 0.608, p = 0.036) and 652-1500 Hz (r = 0.632, p = 0.027) and was not significantly associated with that of 20-652 Hz (r = 0.366, p = 0.242) after adjustment for age and sex. Our findings suggest that underlying snoring sounds may cause carotid wall thickening and support the large-scale evaluation of snoring sound characters as markers of surveillance and for risk stratification at diagnosis.
- Published
- 2016
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32. Effects of sodium pyruvate on ameliorating metabolic acidosis.
- Author
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Yang J, Zhao JX, Wang Y, Chen G, Cheng WN, Luo X, Pei XT, Zhao L, Su Q, and Zhou H
- Subjects
- Acid-Base Equilibrium drug effects, Acidosis chemically induced, Acidosis pathology, Ammonium Chloride, Animals, Blood Gas Analysis, Blood Glucose metabolism, Calcium blood, Cell Line, Creatinine blood, Endothelial Cells metabolism, Humans, Hydrogen-Ion Concentration, Male, Potassium blood, Rats, Rats, Wistar, Sodium blood, Sodium Bicarbonate pharmacology, Urea blood, Acidosis blood, Acidosis drug therapy, Endothelial Cells drug effects, Pyruvic Acid pharmacology
- Abstract
Objective: To examine the effects of sodium pyruvate (SP) on metabolic acidosis., Methods: For the in vivo experiments, we evaluated effects of SP on an ammonium chloride (NH4Cl)-induced hyperchloremic acidosis rat model. SP was infused at overall doses of 2, 4, and 6 mmol·kg(- 1) for the SP1, SP2, and SP3 groups, respectively. Treatment with sodium bicarbonate (SB) was used as a positive control (2 mmol·kg(- 1)), and treatment with normal saline (NS) was used as a volume control (2 mL·kg(- 1)). Blood was sampled from the ophthalmic venous plexus for pH, blood gases, electrolytes, glucose, creatinine (Cr), and urea analysis after injection. For the in vitro experiment, propionate was applied to induce intracellular acidosis in human endothelial cells. Intracellular pH (pHi) was fluorimetrically measured after the addition of SP., Results: In the in vivo study, the pH of SP1 group showed no significant difference compared with that of the NS group. The SP2 and SP3 groups had a higher pH than the NS group (P < 0.01). The SP3 group had a higher pH than the SB group (P < 0.05) and SP1 group (P < 0.05). Moreover, SP treatment ameliorated the abnormality of calcium and decreased the blood potassium levels. The SP3 group had higher glucose levels than SP1 group (P < 0.05). No significant differences were observed between all the groups in the plasma Cr and urea levels. In the in vitro study, the pHi increased immediately after the addition of SP., Conclusion: The data suggest that intravascular treatment with SP represents a novel therapeutic strategy to ameliorate metabolic acidosis.
- Published
- 2016
- Full Text
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33. Treatment of snoring with positional therapy in patients with positional obstructive sleep apnea syndrome.
- Author
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Chen WC, Lee LA, Chen NH, Fang TJ, Huang CG, Cheng WN, and Li HY
- Subjects
- Adult, Cohort Studies, Female, Humans, Male, Middle Aged, Polysomnography, Posture, Risk Factors, Severity of Illness Index, Sleep Apnea, Obstructive diagnosis, Treatment Outcome, Patient Positioning methods, Sleep Apnea, Obstructive physiopathology, Sleep Apnea, Obstructive therapy, Snoring therapy
- Abstract
Position therapy plays a role in treating snoring and obstructive sleep apnea syndrome (OSAS). The purpose of this study was to investigate whether position therapy using a head-positioning pillow (HPP) could reduce snoring sounds in patients with mild-to-moderate positional OSAS, taking into account the potential confounding effects of body weight. A total of 25 adults with positional OSAS (apnea-hypopnea index [AHI]supine:AHInon-supine ≥ 2) were prospectively enrolled. Patients were asked to use their own pillows at home during the first night (N0), and the HPP during the second (N1) and third (N2) nights. The primary outcome measures included the subjective snoring severity (SS, measured on a visual analogue scale ranging from 0 to 10) and the objective snoring index (SI, expressed as the number of snoring events per hour measured on an acoustic analytical program). Both endpoints were recorded over three consecutive nights. From N0 to N2, the median SS and SI values in the entire study cohort decreased significantly from 5.0 to 4.0 and from 218.0 events/h to 115.0 events/h, respectively. In the subgroup of overweight patients, SS showed a significant improvement, whereas SI did not. Both SS and SI were found to be significantly improved in normal-weight patients.
- Published
- 2015
- Full Text
- View/download PDF
34. Changes of snoring sound after relocation pharyngoplasty for obstructive sleep apnoea: the surgery reduces mean intensity in snoring which correlates well with apnoea-hypopnoea index.
- Author
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Li HY, Lee LA, Yu JF, Lo YL, Chen NH, Fang TJ, Hsin LJ, Lin WN, Huang CG, and Cheng WN
- Subjects
- Adult, Body Mass Index, Cohort Studies, Female, Humans, Male, Middle Aged, Outcome Assessment, Health Care, Polysomnography, Severity of Illness Index, Sleep Apnea, Obstructive complications, Sleep Apnea, Obstructive physiopathology, Snoring etiology, Snoring physiopathology, Tonsillectomy, Pharynx surgery, Sleep Apnea, Obstructive surgery, Snoring prevention & control
- Abstract
Objective: To investigate objective changes of snoring after surgery in patients with obstructive sleep apnoea (OSA) and correlate these with changes in the apnoea-hypopnoea index (AHI)., Design: Prospective case series., Setting: A novel measurement, Snore Map, was used to analyse full-night snore sounds in terms of the maximal/mean intensity, peak/mean frequency, snoring index and energy type (Snore Map type, 0-4). Snore sound was classified into three bands according to frequency energy spectrum: B1 (40-300 Hz), B2 (301-850 Hz) and B3 (851-2000 Hz)., Participants: Thirty-four male and two female OSA patients (mean age, 39 years; mean AHI, 53.1/h; mean body mass index, 26.8 kg/m(2) ) with favourable anatomic structure were consecutively enrolled., Main Outcome Measures: Parameters of polysomnographies and Snore Maps at baseline and six months after operation were compared. Statistical significance was set at P < 0.05., Results: Thirty-two patients completed this study. The mean reduction in the total-snoring index was insignificant but there were significant decreases in total mean intensity, total peak frequency, total mean frequency and Snore Map type after surgery. There were also significant decreases in the mean intensity in all three bands, the snoring index in B2/B3 and the mean frequency in B1 postoperatively. Changes in the total mean intensity, total mean frequency, B2 mean intensity and B3 snoring index positively correlated with change in the AHI., Conclusions: Relocation pharyngoplasty significantly decreases both the snoring sound intensity and snoring frequency. These reductions are directly proportional to the improvement of OSA., (© 2014 John Wiley & Sons Ltd.)
- Published
- 2015
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35. Short-term exposure to fluconazole induces chromosome loss in Candida albicans: an approach to produce haploid cells.
- Author
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Chang FM, Ou TY, Cheng WN, Chou ML, Lee KC, Chin YP, Lin CP, Chang KD, Lin CT, and Su CH
- Subjects
- Aneuploidy, Candida albicans cytology, Candida albicans genetics, Comparative Genomic Hybridization, Haploidy, Loss of Heterozygosity, Polymorphism, Single Nucleotide, Antifungal Agents pharmacology, Candida albicans drug effects, Chromosomes, Fungal, Fluconazole pharmacology
- Abstract
Candida albicans is considered to be an obligate diploid fungus. Here, we describe an approach to isolate aneuploids or haploids induced by the short-term (12-16 h) exposure of diploid reference strains SC5314 and CAI4 to the most commonly used antifungal drug, fluconazole, followed by repeated single-cell separation among small morphologically distinct colonies in the inhibition zone. The isolated strains had altered cell morphology and LOH events in the MTL and other marker alleles of the analyzed loci at 8 chromosomes of C. albicans with decreased DNA content. The present study employed next-generation sequencing (NGS) combined flow cytometry analysis of the DNA content to analyze the haploid, autodiploid, and aneuploid strains that arose from the fluconazole treatment instead of using the conventional single nucleotide polymorphism/comparative genome hybridization (SNP/CGH) method. A multiple-alignment tool was also developed based on sequenced data from NGS to establish haplotype mapping for each chromosome of the selected strains. These findings revealed that C. albicans experiences 'concerted chromosome loss' to form strains with homozygous alleles and that it even has a haploid status after short-term exposure to fluconazole. Additionally, we developed a new platform to analyze chromosome copy number using NGS., (Copyright © 2014 Elsevier Inc. All rights reserved.)
- Published
- 2014
- Full Text
- View/download PDF
36. Comparative effects of snoring sound between two minimally invasive surgeries in the treatment of snoring: a randomized controlled trial.
- Author
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Lee LA, Yu JF, Lo YL, Chen NH, Fang TJ, Huang CG, Cheng WN, and Li HY
- Subjects
- Body Mass Index, Humans, Snoring pathology, Sound Spectrography, Statistics, Nonparametric, Surveys and Questionnaires, Treatment Outcome, Minimally Invasive Surgical Procedures methods, Palate, Soft surgery, Snoring surgery
- Abstract
Background: Minimally invasive surgeries of the soft palate have emerged as a less-invasive treatment for habitual snoring. To date, there is only limited information available comparing the effects of snoring sound between different minimally invasive surgeries in the treatment of habitual snoring., Objective: To compare the efficacy of palatal implant and radiofrequency surgery, in the reduction of snoring through subjective evaluation of snoring and objective snoring sound analysis., Patients and Method: Thirty patients with habitual snoring due to palatal obstruction (apnea-hypopnea index ≤15, body max index ≤30) were prospectively enrolled and randomized to undergo a single session of palatal implant or temperature-controlled radiofrequency surgery of the soft palate under local anesthesia. Snoring was primarily evaluated by the patient with a 10 cm visual analogue scale (VAS) at baseline and at a 3-month follow-up visit and the change in VAS was the primary outcome. Moreover, life qualities, measured by snore outcomes survey, and full-night snoring sounds, analyzed by a sound analytic program (Snore Map), were also investigated at the same time., Results: Twenty-eight patients completed the study; 14 received palatal implant surgery and 14 underwent radiofrequency surgery. The VAS and snore outcomes survey scores were significantly improved in both groups. However, the good response (postoperative VAS ≤3 or postoperative VAS ≤5 plus snore outcomes survey score ≥60) rate of the palatal implant group was significantly higher than that of the radiofrequency group (79% vs. 29%, P = 0.021). The maximal loudness of low-frequency (40-300 Hz) snores was reduced significantly in the palatal implant group. In addition, the snoring index was significantly reduced in the radiofrequency group., Conclusions: Both palatal implants and a single-stage radiofrequency surgery improve subjective snoring outcomes, but palatal implants have a greater effect on most measures of subjective and objective snoring. Multi-stage radiofrequency surgery was not tested., Trial Registration: ClinicalTrials.gov NCT01955083.
- Published
- 2014
- Full Text
- View/download PDF
37. Flight performance of the orange wheat blossom midge (Diptera: Cecidomyiidae).
- Author
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Hao YN, Miao J, Wu YQ, Gong ZJ, Jiang YL, Duan Y, Li T, Cheng WN, and Cui JX
- Subjects
- Aging, Animals, China, Female, Insect Control, Light, Male, Sex Characteristics, Temperature, Diptera physiology, Flight, Animal
- Abstract
The orange wheat blossom midge, Sitodiplosis mosellana (Géhin) (Diptera: Cecidomyiidae), is a chronic wheat pest worldwide. Adult S. mosellana engage in short-distance flight, but also exploit weather patterns for long-distance dispersal. However, little is known about the flight performance of S. mosellana, and the effects of the biotic and abiotic factors that influence its flight activity. In this study, we explored the active flight potential of S. mosellana under various environmental factors using a 26-channel computer-monitored flight mill system. The most suitable temperature for flight and flight distance was 16-24 degrees C; flight duration peaked at 16 degrees C while speed peaked at 28 degrees C. Flight performance gradually declined between 10 and 400 lux light intensity. More than 50% individuals of 1-d-old females flew > 500 m, while only 24% of males flew > 500 m. One-day-old S. mosellana had stronger flight ability than that of 2-d-old individuals. This research showed that S. mosellana possessed strong enough flight ability that they can fly to a high altitude and then disperse via moving air currents. These results can aid in forecasting S. mosellana outbreak.
- Published
- 2013
- Full Text
- View/download PDF
38. Positional dependency and surgical success of relocation pharyngoplasty among patients with severe obstructive sleep apnea.
- Author
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Li HY, Cheng WN, Chuang LP, Fang TJ, Hsin LJ, Kang CJ, and Lee LA
- Subjects
- Adult, Female, Humans, Male, Pharynx physiopathology, Polysomnography, Prognosis, Retrospective Studies, Severity of Illness Index, Sleep Apnea, Obstructive physiopathology, Treatment Outcome, Pharynx surgery, Posture physiology, Sleep Apnea, Obstructive surgery
- Abstract
Objective: To examine the effect of positional dependency on surgical success among patients with severe obstructive sleep apnea (OSA) following modified uvulopalatopharyngoplasty, known as relocation pharyngoplasty., Study Design: Case series with planned data collection., Setting: Tertiary referred center., Subjects and Methods: Standard nocturnal polysomnography was used to compare the apnea-hypopnea index (AHI) in different sleep positions before and after relocation pharyngoplasty in 47 consecutive patients with severe OSA (AHI, 59.5 ± 18.2 events/hour; Epworth Sleepiness Scale [ESS] scores, 12.2 ± 4.4) who failed continuous positive airway pressure therapy. Positional (dependency) OSA was defined when the supine:non-supine AHI ratio was >2, otherwise it was defined as nonpositional OSA. Surgical success was defined as a ≥50% reduction in AHI and a postoperative AHI of ≤20 events/hour. Polysomnographic parameters, ESS, and surgical success following surgery were recorded., Results: Of the 47 patients, 27 (57%) had positional OSA and 20 (43%) nonpositional OSA. The nonpositional OSA patients had higher AHI and ESS scores than the positional OSA patients (P = .002 and .104, respectively). Relocation pharyngoplasty significantly improved AHI and ESS scores in both positional and nonpositional OSA groups 6 months postoperatively (P < .05). The overall surgical success rate was 49%; however, positional OSA patients had a significantly higher success rate than nonpositional OSA patients (67% vs 25%, P = .008)., Conclusion: The presence of positional dependency at baseline was a favorable outcome predictor of surgical success among severe OSA patients undergoing relocation pharyngoplasty.
- Published
- 2013
- Full Text
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39. High basal defense gene expression determines sorghum resistance to the whorl-feeding insect southwestern corn borer.
- Author
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Cheng WN, Lei JX, Rooney WL, Liu TX, and Zhu-Salzman K
- Subjects
- Animals, Cyclopentanes metabolism, Genotype, Larva physiology, Nitriles metabolism, Oxylipins metabolism, Sorghum genetics, Transcriptome, United States, Gene Expression Regulation, Plant physiology, Herbivory physiology, Moths physiology, Sorghum metabolism
- Abstract
Southwestern corn borer (SWCB, Diatraea grandiosella) and fall armyworm (FAW, Spodoptera frugiperda) are major pests of sorghum in the southern United States. Host plant resistance is a desirable means for reducing plant damage and yield losses from both insects. In this study, we evaluated 12 sorghum lines for whorl-stage resistance to leaf-feeding SWCB and FAW in greenhouse and laboratory bioassays. Differential plant responses were detected against the two insects. Among 12 lines tested, CM1821, Della and PI196583 were resistant to both insects, while BTx2752 was largely susceptible. Line R.09110 was resistant to SWCB, but susceptible to FAW, whereas Redbine-60 was susceptible to SWCB, but not to FAW. In addition, we quantified various chemical components in the plants and determined their association with insect resistance. Tannin and chlorophyll in leaves did not show any significant correlation with resistance to either insects, but contents of soluble protein in general were negatively correlated with resistance to both insects. Endogenous soluble sugar and dhurrin were only positively correlated with resistance to SWCB, but not with FAW resistance. To gain some molecular insight into resistance mechanism of sorghum to SWCB, we performed qPCR reactions for key genes encoding enzymes involved in dhurrin and jasmonic acid (JA) biosynthesis on selected resistant or susceptible lines. Although these genes were rapidly and strongly induced by insect feeding in all lines, the observed resistance is likely explained by higher constitutive dhurrin contents in some resistant lines and higher basal JA biosynthesis in others. Our results suggest that sorghum utilizes multiple strategies to defend itself against SWCB., (© 2012 Institute of Zoology, Chinese Academy of Sciences.)
- Published
- 2013
- Full Text
- View/download PDF
40. Predictive validity of a three-dimensional model of performance anxiety in the context of tae-kwon-do.
- Author
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Cheng WN, Hardy L, and Woodman T
- Subjects
- Adult, Female, Humans, Male, Multivariate Analysis, Reproducibility of Results, Taiwan, Anxiety psychology, Athletic Performance psychology, Internal-External Control, Martial Arts psychology, Models, Psychological
- Abstract
We tested the predictive validity of the recently validated three-dimensional model of performance anxiety (Chang, Hardy, & Markland, 2009) with elite tae-kwon-do competitors (N = 99). This conceptual framework emphasized the adaptive potential of anxiety by including a regulatory dimension (reflected by perceived control) along with the intensity-oriented dimensions of cognitive and physiological anxiety. Anxiety was assessed 30 min before a competitive contest using the Three-Factor Anxiety Inventory. Competitors rated their performance on a tae-kwon-do-specific performance scale within 30 min after completion of their contest. Moderated hierarchical regression analyses revealed initial support for the predictive validity of the three-dimensional performance anxiety model. The regulatory dimension of anxiety (perceived control) revealed significant main and interactive effects on performance. This dimension appeared to be adaptive, as performance was better under high than low perceived control, and best vs. worst performance was associated with highest vs. lowest perceived control, respectively. Results are discussed in terms of the importance of the regulatory dimension of anxiety.
- Published
- 2011
- Full Text
- View/download PDF
41. Survey of short-term patient satisfaction after surgery for obstructive sleep apnea.
- Author
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Hsiao HR, Wang PC, Cheng WN, Lee LA, Chen NH, Fang TJ, and Li HY
- Subjects
- Adult, Female, Humans, Male, Middle Aged, Prospective Studies, Patient Satisfaction, Sleep Apnea, Obstructive surgery
- Abstract
Background: To investigate the level of satisfaction of patients who received surgery for obstructive sleep apnea (OSA)., Methods: A patient satisfaction survey (PSS) was administered three months after surgery to 76 patients who received either a uvulopalatopharyngoplasty (UPPP) alone, or in combination with a septomeatoplasty (SMP), or a midline laser glossectomy (MLG). Patient satisfaction determinants were also explored., Results: In general, 93.4% of patients rated their overall satisfaction as "excellent" or "very good". High satisfaction levels (excellent + very good >/= 90%) were observed in the dimensions of "professional skill", "personal manner", and "explanation of condition". By contrast, lower satisfaction levels (excellent + very good< 90 %) were observed for "perioperative discomfort". There were no significant differences among the UPPP alone, UPPP + SMP, and UPPP +MLG groups for any dimension of satisfaction (p> 0.05). Older patients had decreased overall levels of satisfaction (adjust R (2) = 0.1, p = 0.02)., Conclusions: The preliminary results reveal a high overall level of satisfaction after surgery for OSA in this short-term survey. However, modest satisfaction with perioperative discomfort was also noted. Combined nasal or tongue base surgeries can be performed with patient satisfaction comparative to that of UPPP alone. Age may confound satisfaction levels in patients receiving OSA surgery.
- Published
- 2009
42. [Change patterns of protective enzyme activities in pre-diapause, diapause, and post-diapause larvae of Sitodiplosis mosellana Gehin].
- Author
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Cheng WN, Wang HL, Li YP, Li JJ, Li XL, and Wu JX
- Subjects
- Animals, Diptera physiology, Larva physiology, Life Cycle Stages physiology, Triticum parasitology, Catalase metabolism, Diptera enzymology, Larva enzymology, Peroxidase metabolism, Superoxide Dismutase metabolism
- Abstract
The activities of protective enzymes peroxidase (POD), superoxide dismutase (SOD) and catalase (CAT) in pre-diapause, diapause, and post-diapause larvae of Sitodiplosis mosellana Gehin were determined by using protective enzyme testing kits. The results indicated that the activities of the three protective enzymes showed a decreasing trend from pre-diapause to early diapause larvae. In one-year cycle, the SOD and CAT activities of diapause larvae had the same responses to environmental temperature, i.e., increased at lower temperature but decreased at higher temperature, while POD activity was related to both environmental temperature and the development situation of the larvae. A similar seasonal variation trend was observed in the three protective enzymes of both no-cocooned and cocooned larvae in one-year cycle. The three protective enzyme activities of no-cocooned larvae were higher than those of cocooned larvae at the same diapause stage. No significant difference of the three protective enzyme activities was found between 1st and 2nd year diapause larvae. The activities of the three protective enzymes increased gradually with the development of post-diapause larvae.
- Published
- 2008
43. Performance on a dementia screening test in relation to demographic variables. Study of 5297 community residents in Taiwan.
- Author
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Liu HC, Teng EL, Lin KN, Hsu TC, Guo NW, Chou P, Hu HH, Cheng WN, and Chiang BN
- Subjects
- Adult, Age Factors, Aged, Educational Status, Female, Humans, Male, Mental Status Schedule, Middle Aged, Rural Population, Sex Characteristics, Taiwan, Urban Population, Dementia diagnosis
- Abstract
Objective: To examine the relation between performance on a dementia screening test and the demographic variables of age, education, gender, and urban vs rural residency., Design: Community survey with cluster sampling., Setting: One urban and one rural community from each of four geographic regions in Taiwan, Republic of China., Participants: A total of 5265 nondemented individuals approximately equally divided between men and women and between urban and rural residency with a range in age from 41 to 88 years and in education from 0 to 20 years., Main Outcome Measure: Score on a Chinese adaptation of the Mini-Mental State Examination., Results: Lower test scores were associated with older age and less education. The decrease in score with age was faster among participants who had never attended school. Better performance by men and by urban residents was found only among participants with fewer than 6 years of schooling. In this group, the magnitudes of sex and residency differences were comparable among those subjects aged 41 to 64 years and those aged 65 to 88 years. Women who had never worked outside of the home performed poorer than those who had worked outside of the home., Conclusions: The influence of educational background on test performance is most evident in individuals with less education. Commonly used dementia screening tests may be unfair to poorly educated individuals, especially women and rural residents. Efforts should be made to develop ecologically relevant cognitive tests for the intended study populations. To help distinguish test bias from different rates of cognitive decline, the study populations should include individuals in predementia age ranges.
- Published
- 1994
- Full Text
- View/download PDF
44. A health survey of workers in the pentachlorophenol section of a chemical manufacturing plant.
- Author
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Cheng WN, Coenraads PJ, Hao ZH, and Liu GF
- Subjects
- Aminolevulinic Acid urine, China epidemiology, Chlorobenzenes adverse effects, Health Surveys, Humans, Male, Neural Conduction, Porphyrins urine, Acne Vulgaris chemically induced, Acne Vulgaris epidemiology, Acne Vulgaris urine, Chemical Industry statistics & numerical data, Occupational Diseases chemically induced, Occupational Diseases epidemiology, Occupational Diseases physiopathology, Occupational Diseases urine, Pentachlorophenol adverse effects
- Abstract
During 1968 to 1985, 109 workers who had been engaged in the production of pentachlorophenol, using non-gamma isomers of hexachloroclohexane (BHC) as the raw material, were surveyed. Endemic chloracne among them had been noted since 1974. The prevalence of chloracne was 73.4% (80/109) in total and 95.2% (20/21) in a trichlorobenzene (TCB) tank area where dioxin and dibenzofurans levels were thousands of ppm. To our knowledge, PCDDs and PCDFs have not previously been reported from thermal decomposition of BHC. Urinary porphyrins were significantly higher among exposed workers than among the controls but there was no significant difference between the workers with chloracne and those without. The conduction velocities of the median motor nerves were much slower among the workers in the TCB tank area where the highest PCDDs contamination appeared. The mortality study cohort was relatively young. Based on the three deaths observed during the follow-up, no association could be drawn.
- Published
- 1993
- Full Text
- View/download PDF
45. A retrospective mortality cohort study of chrysotile asbestos products workers in Tianjin 1972-1987.
- Author
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Cheng WN and Kong J
- Subjects
- Adolescent, Adult, Aged, Aged, 80 and over, China epidemiology, Cohort Studies, Female, Humans, Lung Neoplasms chemically induced, Lung Neoplasms epidemiology, Lung Neoplasms mortality, Male, Middle Aged, Occupational Diseases epidemiology, Retrospective Studies, Smoking adverse effects, Smoking mortality, Asbestos adverse effects, Occupational Diseases chemically induced, Occupational Diseases mortality
- Abstract
The mortality rate of a cohort of asbestos workers was investigated in Tianjin, China, between January 1, 1972, and December 31, 1987. The cohort consisted of 662 males and 510 females, employed in asbestos textiles, friction material, and asbestos cement manufacturing. A statistically significant excess mortality was observed for lung cancer in both males and females (SMR 278 and 427, respectively). An increasing trend in SMR was observed with increasing intervals of exposure as well as with increasing exposure level. A synergistic effect was seen between asbestos exposure and cigarette smoking regarding lung cancer. The ratio of smoking and nonsmoking lung cancer death rates was virtually the same in asbestos and in nonasbestos workers. This ratio was approximately 1.6, a value much less than that reported in other countries. This low ratio appears to reflect the fact that many nonsmokers were in fact passive cigarette smokers. Second, it reflects the fact that most smokers smoked hand-rolled tobacco, since manufactured cigarettes did not become popular in China until 1965. These data confirm the hazards of asbestos exposure in developing countries.
- Published
- 1992
- Full Text
- View/download PDF
46. A modified posterior approach for Moore arthroplasty of the hip - a preliminary report.
- Author
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Teh PH and Cheng WN
- Subjects
- Aged, Hip Prosthesis adverse effects, Humans, Risk, Surgical Wound Infection etiology, Femoral Neck Fractures surgery, Hip Prosthesis methods
- Abstract
Prosthetic replacement for displaced femoral neck fracture in the elderly is commonly done through a posterior ("southern') approach. Although this is a good approach post-operative wound infection and dislocation may occur. Such problems have led the authors to modify this surgical approach through the upper part of the quadratus femoris, and the lower part of the hip capsule. Preliminary results in the early post-operative period in ten patients have been encouraging and if done with care it appears to minimise the risk of post-operative infection and dislocation.
- Published
- 1981
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