27 results on '"Vandhana, S."'
Search Results
2. Spatial and Temporal Variations on Air Quality Prediction Using Deep Learning Techniques
- Author
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Vandhana S. and Anuradha J.
- Subjects
bi-lstm ,air pollution ,spatial-temporal analysis ,prediction ,Cybernetics ,Q300-390 - Abstract
Air Pollution is constantly causing a severe effect on the environment and public health. Prediction of air quality is widespread and has become a challenging issue owing to the enormous environmental data with time-space nonlinearity and multi-dimensional feature interaction. There is a need to bring out the spatial and temporal factors that are influencing the prediction. The present study concentrates on the correlation prediction of spatial and temporal relations. A Deep learning technique has been proposed for forecasting the accurate prediction. The proposed Bi_ST model is evaluated for 17 cities in India and China. The predicted results are evaluated with the performance metrics of RMSE, MAE, and MAPE. Experimental results demonstrate that our method Bi_ST accredits more accurate forecasts than all baseline RNN and LSTM models by reducing the error rate. The accuracy of the model obtained is 94%.
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- 2023
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3. Insights on Surya namaskar from its origin to application towards health
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Prasanna Venkatesh, L. and Vandhana, S.
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- 2022
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- View/download PDF
4. Neutrosophic Fuzzy Hierarchical Clustering for Dengue Analysis in Sri Lanka
- Author
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Vandhana S and J Anuradha
- Subjects
dengue ,hierarchical clustering ,fuzzy hierarchical clustering ,neutrosophic logic ,Mathematics ,QA1-939 ,Electronic computers. Computer science ,QA75.5-76.95 - Abstract
In the structure of nature, we believe that there is an underlying knowledge in all the phenomena we wish to understand. Mainly in the area of epidemiology we often tend to seek the structure of the data obtained, pattern of the disease, nature or cause of its emergence among living organisms. Sometimes, we could see the outbreak of disease is ambiguous and the exact cause of the disease is unknown. A significant number of algorithms and methods are available for clustering disease data. We could see that literature has no traces of including indeterminacy or vagueness in data which has to be much concentrated in epidemiological field. This study analyzes the attack of dengue in 26 districts of Sri Lanka for the period of seven years from 2012 to 2018. Clusters with low risk, medium risk and high risk areas affected by dengue are identified. In this paper, we propose a new algorithm called Neutrosophic-Fuzzy Hierarchical Clustering algorithm (NFHC) that includes indeterminacy. Proposed algorithm is compared with fuzzy hierarchical clustering algorithm and hierarchical clustering algorithm. Finally the results are evaluated with the benchmarking indexes and the performance of the clustering algorithm is studied. NFHC has performed a way better than the other two algorithms.
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- 2020
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- View/download PDF
5. Childhood maltreatment is linked to larger preferred interpersonal distances towards friends and strangers across the globe
- Author
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Haim-Nachum, S., Sopp, M. R., Lüönd, A. M., Afzal, N., Åhs, Fredrik, Allgaier, A. -K, Arévalo, A., Asongwe, C., Bachem, R., Balle, S. R., Belete, H., Belete Mossie, T., Berzengi, A., Capraz, N., Ceylan, D., Dukes, D., Essadek, A., Fares-Otero, N. E., Halligan, S. L., Hemi, A., Iqbal, N., Jobson, L., Levy-Gigi, E., Martin-Soelch, C., Michael, T., Oe, M., Olff, M., Örnkloo, Helena, Prakash, K., Quaatz, S. M., Raghavan, V., Ramakrishnan, Muniarajan, Reis, D., Şar, V., Schnyder, U., Seedat, S., Shihab, I. N., Vandhana, S., Wadji, D. L., Wamser, R., Zabag, R., Spies, G., Pfaltz, Monique C., Haim-Nachum, S., Sopp, M. R., Lüönd, A. M., Afzal, N., Åhs, Fredrik, Allgaier, A. -K, Arévalo, A., Asongwe, C., Bachem, R., Balle, S. R., Belete, H., Belete Mossie, T., Berzengi, A., Capraz, N., Ceylan, D., Dukes, D., Essadek, A., Fares-Otero, N. E., Halligan, S. L., Hemi, A., Iqbal, N., Jobson, L., Levy-Gigi, E., Martin-Soelch, C., Michael, T., Oe, M., Olff, M., Örnkloo, Helena, Prakash, K., Quaatz, S. M., Raghavan, V., Ramakrishnan, Muniarajan, Reis, D., Şar, V., Schnyder, U., Seedat, S., Shihab, I. N., Vandhana, S., Wadji, D. L., Wamser, R., Zabag, R., Spies, G., and Pfaltz, Monique C.
- Abstract
Childhood maltreatment (CM) is thought to be associated with altered responses to social stimuli and interpersonal signals. However, limited evidence exists that CM is linked to larger comfortable interpersonal distance (CID) – the physical distance humans prefer towards others during social interactions. However, no previous study has investigated this association in a comprehensive sample, yielding sufficient statistical power. Moreover, preliminary findings are limited to the European region. Finally, it is unclear how CM affects CID towards different interaction partners, and whether CID is linked to social functioning and attachment. To address these outstanding issues, adults (N = 2986) from diverse cultures and socio-economic strata completed a reaction time task measuring CID towards an approaching stranger and friend. Higher CM was linked to a larger CID towards both friends and strangers. Moreover, insecure attachment and less social support were associated with larger CID. These findings demonstrate for the first time that CM affects CID across countries and cultures, highlighting the robustness of this association.
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- 2024
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6. Forecasting Air Quality in India through an Ensemble Clustering Technique
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Anuradha, J., primary, Vandhana, S., additional, and Reddi, Sasya I., additional
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- 2020
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7. Dengue Prediction Using Hierarchical Clustering Methods
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Vandhana, S., Anuradha, J., Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Weikum, Gerhard, Series Editor, Chatterjee, Samir, editor, Dutta, Kaushik, editor, and Sundarraj, Rangaraja P., editor
- Published
- 2018
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8. VIEGO: Malware Generating Tool
- Author
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Sohan Simha P, Vandhana S, and Roopashree S
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- 2022
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9. Dengue Prediction Using Hierarchical Clustering Methods
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Vandhana, S., primary and Anuradha, J., additional
- Published
- 2018
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10. Aspects of Ambient Assisted Living and Its Applications
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Anuradha, J., primary and Vandhana, S., additional
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- 2017
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11. Clinico-pathological correlations of fatty acid synthase expression in retinoblastoma: An Indian cohort study
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Vandhana, S., Deepa, P.R., Jayanthi, U., Biswas, J., and Krishnakumar, S.
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- 2011
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12. FAHR’S SYNROME- A RARITY
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T, Swathi., primary, Pathuri, Naga Kalyani, additional, Vandhana, S., additional, Kumari, K. Swarajya, additional, and Padmaja, G.J.Vani, additional
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- 2022
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13. CYTO-HISTOLOGICAL CORRELATION OF BRONCHIAL BRUSH AND BRONCHIAL BIOPSY IN LUNG MALIGNANCIES
- Author
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Jyothi, B., primary, Vandhana, S., additional, and Sujatha, S., additional
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- 2021
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14. Chemical inhibition of fatty acid synthase: molecular docking analysis and biochemical validation in ocular cancer cells
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Deepa, P. R., Vandhana, S., Muthukumaran, S., Umashankar, V., Jayanthi, U., and Krishnakumar, S.
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- 2010
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15. Anxiety and depression among children with learning disability and their parents.
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Vandhana, S. and RadhaKumar, Dr.
- Subjects
CHILDREN with learning disabilities ,MENTAL depression ,ANXIETY in children ,COMORBIDITY ,SOCIOECONOMIC status - Abstract
Background: The presence of a disabled child causes profound changes in the family, with impact of anxiety and depression on parents and on their quality of life being considerable. Aim: The present study assessed the psychological comorbidity of children with learning problems and also evaluated the anxiety and depression among parents with learning disability children. Methods: This prospective questionnaire‑based study was conducted in the Department of Psychiatry, Kanchi Kamakoti Childs Trust Hospital (KKCTH). The study participants are inclusive of all the children with learning disability and their parents who gave their informed consent and available during the study period. Results: Statistical significance was present between the prevalence of depression in relation to gender and the socioeconomic variables. The generalized anxiety disorder was found to be to about 25% among the study subjects. Around 31.5 % of mild depression was prevalent among the parents of learningdisabled children Conclusion: Effective intervention programs are in need of the hour to address comorbid conditions like depression and anxiety. Psychoeducation about the child’s condition and an effective remedial education program will be a great boon to the community. [ABSTRACT FROM AUTHOR]
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- 2022
16. Prediction of water quality using Naive Bayesian algorithm
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Varalakshmi, P., primary, Vandhana, S., additional, and Vishali, S., additional
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- 2017
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17. Survival Instincts in Ernest Hemingway's The Old Man And The Sea And Yann Martel's Life Of Pi.
- Author
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Vandhana, S.
- Subjects
INSTINCT (Behavior) - Abstract
Ernest Hemingway's The Old Man And The Sea and Yann Martel's Life Of Pi made them significant novelists of Nautical Literature. Their main focus is on survival of their protagonists. Both the novels have an autobiographical touch in them. Hemingway had described his own fishing experience in Gulf Stream in The Old Man And The Sea and Yann Martel wrote Pi's own story narrated to him by Pi. Santiago in The Old Man And The Sea and Pi in Life Of Pi are the victims of wilderness. The Old Man And The Sea was constructed like a five-act play. The incidents unfold in a dramatic manner. The incidents that happened over the next three days include Santiago catching the marlin and losing it consequently. The harpooning of the marlin and its destruction form the climax and anti-climax respectively. Life Of Pi has built in three parts. The first part dealt with Pi's childhood. The second part narrated Pi's survival in a lifeboat in the middle of the Pacific Ocean with Richard Parker, an adult Bengal Tiger. The third part described Pi's conversation with two officials fromthe Japanese Ministry of Transport about his survival in sea with a tiger. In The Old Man And The Sea, Hemingway had given equal importance to both Santiago and Manolin, though Manolin appeared only in the minor part of the novel. In Life Of Pi, Yann Martel focused mainly on Pi's survival story and with lesser importance on other characters in the novel. Both the novels end positively with a sad note. In The Old Man And The Sea, though Santiago had survived, he lost his greatest catch in his life. Similarly, in Life Of Pi, Pi also survived from all the dangers that fate had offered him. But the loss of his greatest companion, Richard Parker made him gloomy. Thus both Ernest Hemingway and Yann Martel had dealt with the theme of survival successfully in their respective novels. [ABSTRACT FROM AUTHOR]
- Published
- 2016
18. Oxidative Stress in Retinoblastoma: Correlations with Clinicopathologic Features and Tumor Invasiveness
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Deepa, P. R., primary, Nalini, V., additional, Mallikarjuna, K., additional, Vandhana, S, additional, and Krishnakumar, S, additional
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- 2009
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19. Insights on Surya namaskar from its Origin to Application towards Health
- Author
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Prasanna Venkatesh, L. and Vandhana, S.
- Abstract
Suryanamaskar is considered a part of modern-day yogic practices though it was neither considered an asana nor a part of traditional yoga. The practice of surya namaskar before beginning any routine activities vitalizes the practitioner and gives a completely energized day. Starting from the Raja of Aundh who first introduced surya namaskar, there is a line of eminent people who popularized this dynamic group of asanas such as T Krishnamacharya, Swami Sivananda, Swami Satyananda from Bihar school of yoga, so on and so forth. These contributions resulted in this excellent series of asanas being introduced to the practitioners. Such a miraculous group of postures also involves dynamic breathing patterns at each posture and gives a form of complete practice involving asanas and pranayama. There are a total of 12 postures in surya namaskar practice and 24 steps in one round. This is in the form of salutation to the “Sun” along with chanting the twelve names of the sun god. In this review, we accentuate the importance of surya namaskar highlighting its effects on physical and physiological aspects of the body based on published research. The paper also discusses the importance of surya namaskar in maintaining mental health through various literature studies. In addition, the usefulness of surya namaskar as a practice superior to other existing physical exercise regimens and as one complete sadhana for the whole body is emphasized.
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- 2021
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20. Childhood maltreatment is linked to larger preferred interpersonal distances towards friends and strangers across the globe.
- Author
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Haim-Nachum S, Sopp MR, Lüönd AM, Afzal N, Åhs F, Allgaier AK, Arévalo A, Asongwe C, Bachem R, Balle SR, Belete H, Belete Mossie T, Berzengi A, Capraz N, Ceylan D, Dukes D, Essadek A, Fares-Otero NE, Halligan SL, Hemi A, Iqbal N, Jobson L, Levy-Gigi E, Martin-Soelch C, Michael T, Oe M, Olff M, Örnkloo H, Prakash K, Quaatz SM, Raghavan V, Ramakrishnan M, Reis D, Şar V, Schnyder U, Seedat S, Shihab IN, Vandhana S, Wadji DL, Wamser R, Zabag R, Spies G, and Pfaltz MC
- Subjects
- Humans, Male, Female, Adult, Young Adult, Middle Aged, Adult Survivors of Child Abuse psychology, Psychological Distance, Object Attachment, Adolescent, Social Interaction, Social Support, Reaction Time, Friends psychology, Interpersonal Relations
- Abstract
Childhood maltreatment (CM) is thought to be associated with altered responses to social stimuli and interpersonal signals. However, limited evidence exists that CM is linked to larger comfortable interpersonal distance (CID) - the physical distance humans prefer towards others during social interactions. However, no previous study has investigated this association in a comprehensive sample, yielding sufficient statistical power. Moreover, preliminary findings are limited to the European region. Finally, it is unclear how CM affects CID towards different interaction partners, and whether CID is linked to social functioning and attachment. To address these outstanding issues, adults (N = 2986) from diverse cultures and socio-economic strata completed a reaction time task measuring CID towards an approaching stranger and friend. Higher CM was linked to a larger CID towards both friends and strangers. Moreover, insecure attachment and less social support were associated with larger CID. These findings demonstrate for the first time that CM affects CID across countries and cultures, highlighting the robustness of this association., (© 2024. The Author(s).)
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- 2024
- Full Text
- View/download PDF
21. Environmental air pollution clustering using enhanced ensemble clustering methodology.
- Author
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Vandhana S and Anuradha J
- Subjects
- Cluster Analysis, Environmental Pollution, Humans, Air Pollution, Algorithms
- Abstract
Air pollution these days could cause severe effects on human health. As human health is crumbled with serious respiratory or other lung diseases, it is prominent to study air pollution. One of the ways to address this issue is by applying clustering techniques. The two main important problems that are faced in the clustering algorithm are, firstly, the exact shape of the cluster and the number of clusters that input data can produce. Secondly, choosing an appropriate algorithm for a particular problem is not clearly known. Finally, multiple replications of the same algorithm lead to alternative solutions due to the fact such as random initialization of cluster heads. Ensembling algorithms can handle these problems and overcome bias and variance in the traditional clustering process. An adequate study has not been carried out in the ensembling approach mainly for clustering. In this paper, we use an enhanced ensemble clustering method to cluster the pollution data levels. This study helps to take preventive measures that are needed to control further contamination, reduce the alarming levels, and analyze the results to find healthy and unhealthy regions in a given area. This ensemble technique also explains about uncertain objects that are found in clustering. The distinct advantage of this algorithm is that there is no requirement of prior information about the data. This experiment shows that the implemented ensemble consensus clustering has demonstrated improved performance when compared with basic clustering algorithms., (© 2020. Springer-Verlag GmbH Germany, part of Springer Nature.)
- Published
- 2021
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22. Bio-conjugation of antioxidant peptide on surface-modified gold nanoparticles: a novel approach to enhance the radical scavenging property in cancer cell.
- Author
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Kalmodia S, Vandhana S, Tejaswini Rama BR, Jayashree B, Sreenivasan Seethalakshmi T, Umashankar V, Yang W, Barrow CJ, Krishnakumar S, and Elchuri SV
- Abstract
Background: Functionalized gold nanoparticles are emerging as a promising nanocarrier for target specific delivery of the therapeutic molecules in a cancer cell, as a result it targeted selectively to the cancer cell and minimized the off-target effect. The functionalized nanomaterial (bio conjugate) brings novel functional properties, for example, the high payload of anticancer, antioxidant molecules and selective targeting of the cancer molecular markers. The current study reported the synthesis of multifunctional bioconjugate (GNPs-Pep-A) to target the cancer cell., Methods: The GNPs-Pep-A conjugate was prepared by functionalization of GNPs with peptide-A (Pro-His-Cys-Lys-Arg-Met; Pep-A) using thioctic acid as a linker molecule. The GNPs-Pep-A was characterized and functional efficacy was tested using Retinoblastoma (RB) cancer model in vitro., Results: The GNPs-Pep-A target the reactive oxygen species (ROS) in RB, Y79, cancer cell more effectively, and bring down the ROS up to 70 % relative to control (untreated cells) in vitro. On the other hand, Pep-A and GNPs showed 40 and 9 % reductions in ROS, respectively, compared to control. The effectiveness of bioconjugate indicates the synergistic effect, due to the coexistence of both organic (Pep-A) and inorganic phase (GNPs) in novel GNPs-Pep-A functional material. In addition to this, it modulates the mRNA expression of antioxidant genes glutathione peroxidase (GPX), superoxide dismutase (SOD) and catalase (CAT) by two-threefolds as observed., Conclusions: The effects of GNPs-Pep-A on ROS reduction and regulation of antioxidant genes confirmed that Vitis vinifera L . polyphenol-coated GNPs synergistically improve the radical scavenging properties and enhanced the apoptosis of cancer cell.
- Published
- 2016
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23. Biochemical changes accompanying apoptotic cell death in retinoblastoma cancer cells treated with lipogenic enzyme inhibitors.
- Author
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Vandhana S, Coral K, Jayanthi U, Deepa PR, and Krishnakumar S
- Subjects
- 3T3 Cells, Animals, Cells, Cultured, Chromatography, High Pressure Liquid, Embryo, Mammalian cytology, Embryo, Mammalian metabolism, Fatty Acid Synthases antagonists & inhibitors, Fatty Acids, Nonesterified metabolism, Fibroblasts cytology, Fibroblasts metabolism, Humans, Lipid Peroxidation drug effects, Lipids analysis, Malondialdehyde metabolism, Malonyl Coenzyme A metabolism, Mice, Retinoblastoma drug therapy, Retinoblastoma enzymology, Apoptosis drug effects, Embryo, Mammalian drug effects, Enzyme Inhibitors pharmacology, Fatty Acid Synthases metabolism, Fibroblasts drug effects, Retinoblastoma pathology
- Abstract
Retinoblastoma (RB) is a malignant intra-ocular neoplasm that affects children (usually below the age of 5years). In addition to conventional chemotherapy, novel therapeutic strategies that target metabolic pathways such as glycolysis and lipid metabolism are emerging. Fatty acid synthase (FASN), a lipogenic multi-enzyme complex, is over-expressed in retinoblastoma cancer. The present study evaluated the biochemical basis of FASN inhibition induced apoptosis in cultured Y79 RB cells. FASN inhibitors (cerulenin, triclosan and orlistat) significantly inhibited FASN enzyme activity (P<0.05) in Y79 RB cells. This was accompanied by a decrease in palmitate synthesis (end-product depletion), and increased malonyl CoA levels (substrate accumulation). Differential lipid profile was biochemically estimated in neoplastic (Y79 RB) and non-neoplastic (3T3) cells subjected to FASN inhibition. The relative proportion of phosphatidyl choline to neutral lipids (triglyceride+total cholesterol) in Y79 RB cancer cells was found to be higher than the non-neoplastic cells, indicative of altered lipid distribution and utilization in tumor cells. FASN inhibitor treated Y79 RB and fibroblast cells showed decrease in the cellular lipids (triglyceride, cholesterol and phosphatidyl choline) levels. Apoptotic DNA damage induced by FASN inhibitors was accompanied by enhanced lipid peroxidation., (© 2013.)
- Published
- 2013
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24. Fatty acid synthase inhibition induces differential expression of genes involved in apoptosis and cell proliferation in ocular cancer cells.
- Author
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Deepa PR, Vandhana S, and Krishnakumar S
- Subjects
- Acetyl-CoA Carboxylase genetics, Antineoplastic Agents pharmacology, Apoptosis drug effects, Apoptosis genetics, Cell Cycle drug effects, Cell Cycle genetics, Cell Line, Tumor, Cell Proliferation drug effects, Cytochromes c genetics, Cytochromes c metabolism, Fatty Acid Synthase, Type I metabolism, Humans, Lipid Metabolism drug effects, Lipid Metabolism genetics, PPAR alpha genetics, PPAR gamma genetics, Retinal Neoplasms genetics, Retinoblastoma genetics, S-Phase Kinase-Associated Proteins genetics, Cerulenin pharmacology, Fatty Acid Synthase, Type I antagonists & inhibitors, Fatty Acid Synthesis Inhibitors pharmacology, Gene Expression Regulation, Neoplastic drug effects, Retinal Neoplasms drug therapy, Retinoblastoma drug therapy
- Abstract
Fatty acid synthase (FASN), a lipogenic multienzyme complex, is overexpressed in the ocular cancer, retinoblastoma, and is strongly correlated with tumor invasion. Dietary nutrients are reported to exert anticancer effects through inhibition of lipid metabolism. Differential gene expression in cultured retinoblastoma cells induced by cerulenin, a chemical inhibitor of FASN, was evaluated by cDNA microarray analysis. Cerulenin treatment resulted in significant upregulation of cytochrome c (CYCS) by 1.2-fold, whereas S-phase kinase-associated protein-2 (SKP2), a negative regulator of cell cycle, and the lipid metabolic genes (PPARA, RXRA, and ACACB) were significantly downregulated by -1.59-, -1.8-, -1.83-, and -1.5-fold, respectively, in comparison with untreated cancer cells. The expressions of key differentially expressed genes were confirmed by quantitative real-time PCR. The altered expression of genes involved in cell proliferation, cell signaling, apoptosis, and cell cycle, correlated with the anticancer effects of cerulenin. FASN inhibition may thus be a potential strategy in retinoblastoma management.
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- 2013
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25. Microarray analysis and biochemical correlations of oxidative stress responsive genes in retinoblastoma.
- Author
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Vandhana S, Lakshmi TS, Indra D, Deepa PR, and Krishnakumar S
- Subjects
- Child, Child, Preschool, Female, Humans, Male, Microarray Analysis, Reactive Oxygen Species metabolism, Real-Time Polymerase Chain Reaction, Retina metabolism, Retina pathology, Retinal Neoplasms metabolism, Retinal Neoplasms pathology, Retinoblastoma metabolism, Retinoblastoma pathology, Retinoblastoma Protein biosynthesis, Signal Transduction, Tumor Cells, Cultured, DNA, Neoplasm genetics, Gene Expression Regulation, Neoplastic, Genes, Retinoblastoma genetics, Oxidative Stress, Retinal Neoplasms genetics, Retinoblastoma genetics, Retinoblastoma Protein genetics
- Abstract
Purpose: Oxidative stress, which refers to the biological damage caused by free radicals produced in excess of innate antioxidant defenses, is indicated in the ocular cancer retinoblastoma (RB). Here we have analysed the differential expression of oxidative stress responsive genes in oxidant-induced RB cells, and in RB tumor tissues., Methods: The study included cultured RB cells, and four RB tumor tissues. The reactive oxygen species (ROS) levels in Y79 cells and the RB tumor induced by hydrogen peroxide were quantified by Dichlorofluorescein (DCF) fluorescence assay. We then analysed the gene expression profile of cultured RB cells induced with hydrogen peroxide (400 µM H(2)O(2) for 8 h) by microarray analysis, and the expression of select genes were validated in Y79 cells and RB tumor tissues by real-time PCR analysis., Results: The oxidant-induced RB tumors showed an average increase in ROS levels of 44-fold compared to induced non-neoplastic donor retina. H(2)O(2)-induced RB cell line showed a 3-fold increase in ROS levels. Microarray analysis on RB cell line induced with H(2)O(2) showed differentially regulated genes involved in cellular processes such as: oxidative stress, angiogenesis, lipid metabolism, cell proliferation, and cell signaling pathways. Several up-regulated genes such as SOD, GPX, CAT, CDC25A, CREBBP, JUN, MMP-2, iNOS, CRYAA, RXRA, ACACB and HMGCR were validated by real-time PCR. These results corroborated with the gene expression analysis in RB tumor tissues. Relating the antioxidant gene expression with the clinico-pathologic features of the tumor tissues, we found that the tumor with invasion of choroid, optic nerve and retinal pigment epithelium, had relatively higher ROS levels and minimal antioxidant gene expression, when compared with the tumor with only choroidal invasion., Conclusions: The study suggests active involvement of redox signaling pathways in the pathogenesis of RB. Consideration of oxidative stress components in the clinical management of RB patients is emphasized.
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- 2012
- Full Text
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26. Therapeutic and toxicologic evaluation of anti-lipogenic agents in cancer cells compared with non-neoplastic cells.
- Author
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Deepa PR, Vandhana S, Jayanthi U, and Krishnakumar S
- Subjects
- 3T3 Cells, Animals, Apoptosis drug effects, Cell Line, Tumor, Cell Proliferation drug effects, Cell Shape drug effects, Cell Survival drug effects, Cerulenin pharmacology, DNA Fragmentation, Dose-Response Relationship, Drug, Fatty Acid Synthesis Inhibitors toxicity, Fibroblasts enzymology, Fibroblasts pathology, Humans, Inhibitory Concentration 50, Lactones pharmacology, Mice, Neuroglia enzymology, Neuroglia pathology, Orlistat, Retinal Neoplasms enzymology, Retinoblastoma enzymology, Time Factors, Triclosan pharmacology, Fatty Acid Synthesis Inhibitors pharmacology, Fibroblasts drug effects, Neuroglia drug effects, Retinal Neoplasms pathology, Retinoblastoma pathology
- Abstract
Fatty acid synthase (FASN), a multi-enzyme complex, is involved in lipid biosynthesis. FASN is over-expressed in different types of cancers and is being widely investigated for its role in cancer progression, diagnosis and therapy. Here, three inhibitors targeting different domains of FASN--cerulenin, triclosan and orlistat--were evaluated for their anti-proliferative efficacy in ocular cancer, retinoblastoma (RB) cells and their toxicity (if any) in normal cells. FASN inhibitors were tested in cultured retinoblastoma Y79 cells, normal fibroblast (3T3) and Müller glial (MIOM1) cells. Cell viability was determined by MTT-based assay, and IC(50) (50% inhibitory concentration) of the FASN inhibitors was calculated in neoplastic and non-neoplastic cells. The IC(50) after 48 and 96 hr of incubation with the three anti-FASN agents showed that cerulenin, triclosan and orlistat inhibited retinoblastoma cell proliferation in a dose- and time-dependent manner. The cancer cells exhibited differential dose- and time-dependent response/sensitivities to cerulenin, triclosan and orlistat. The 48-hr neoplastic IC(50) dosages were, however, not toxic to the normal cells. These findings were confirmed by phase-contrast microscopic assessment of cell morphology. Therapeutic index (TI) was calculated as a ratio of the IC(50) normal cells, to the IC(50) neoplastic cells. Relative to normal MIOM1 cells, TI was 9.18 for cerulenin, while 5.32 for triclosan and 1.72 for orlistat. The TI computed relative to 3T3 cells was 28.64, 7.10 and 2.58 for cerulenin, triclosan and orlistat, respectively. DNA fragmentation analysis suggests that FASN inhibitors induced apoptotic DNA damage in retinoblastoma cells. Thus, FASN inhibition can be an effective strategy in retinoblastoma therapy., (© 2011 The Authors. Basic & Clinical Pharmacology & Toxicology © 2011 Nordic Pharmacological Society.)
- Published
- 2012
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27. Evaluation of suitable solvents for testing the anti-proliferative activity of triclosan - a hydrophobic drug in cell culture.
- Author
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Vandhana S, Deepa PR, Aparna G, Jayanthi U, and Krishnakumar S
- Subjects
- Breast Neoplasms drug therapy, Breast Neoplasms pathology, Cell Line, Tumor, Cell Proliferation drug effects, Drug Screening Assays, Antitumor, Female, Humans, Hydrophobic and Hydrophilic Interactions, Solubility, Solvents, Antineoplastic Agents pharmacology, Triclosan pharmacology
- Abstract
Triclosan, a broad spectrum antibiotic is currently being evaluated for its anti-cancer property. Though several solvents are available to dissolve lipophilic (hydrophobic) drugs, solubility and toxicity aspects pose a challenge, when combined with the cell culture medium. In this paper, we present a simple approach based on physico-chemical and biologic criteria to choose a suitable solubilizing agent to study the anti-proliferative property of triclosan in breast cancer cell line MCF-7. Triclosan was dissolved in five different solvents viz. DMSO, absolute ethanol, 1 N NaOH, 55% polyethylene glycol + 45% ethanol mixture (PEM) and acetone and diluted with the culture medium (1 mg/ml). Although triclosan dissolved completely in all five solvents, on dilution with culture medium, turbidity was observed in DMSO, 1 N NaOH and ethanol. Cell viability was 95.23% in 10 microl of acetone, when compared with 49.45% at the same volume of PEM. This non-toxic nature of acetone was supported by DNA fragmentation analysis and phase contrast microscopy. A significant decrease in cancer cell proliferation at 100 microg/ml of acetone-solubilized triclosan, compared with 100 microg/ml of PEM-solubilized triclosan (p<0.05) indicated stronger anti-proliferative effect and greater drug-sensitivity of triclosan when solubilized in acetone. Results showed that acetone-solubilized triclosan was suitable for anti-cancer investigations in cultured MCF-7 cells.
- Published
- 2010
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