BITS Faculty Publications
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Item Influence of a low-molecular-weight heparin derivative on the nitric oxide levels and apoptotic DNA damage in adriamycin-induced cardiac and renal toxicity(Elsiever, 2006) Deepa, P.R.The spectrum of the anti-apoptotic potential of heparin is currently under scrutiny in various tissues and under various pathological situations. In this study, the role of a low-molecular-weight heparin derivative (LMWH), certoparin in adriamycin-induced oxidative DNA damage has been evaluated in the cardiac and renal tissues. Two groups of male albino rats of the Wistar strain (140 ± 10 g) received a single intravenous injection of adriamycin (7.5 mg/kg), and one of them received low-molecular-weight heparin (Certoparin Sodium, 300 μg/day/rat s.c.) treatment, commencing on day 8, continued for a week. The nitrosative stress in ADR cytotoxicity is indicated by the 1.51-fold cardiac and 2.36-fold renal increase in reactive nitrogen species (RNS), while LMWH treatment restores normalcy (p < 0.001). The influence of LMWH on the pro-inflammatory and pro-apoptotic cytokine, TNF-α was studied. Renal and cardiac levels of TNF-α showed a significant rise (p < 0.001) in the ADR cytotoxic group, while the TNF-α values departed towards control levels in the LMWH treated group (p < 0.001). DNA damage indicated by the fragmentation pattern (agarose gel electrophoresis) and the significantly increased comet tail length (p < 0.001) observed after alkaline single cell gel electrophoresis confirmed the toxicity induced by ADR on DNA in the untreated group. In the LMWH-treated group, the observation of intact DNA band after agarose gel electrophoresis, and the finding of comet tail length being comparable with that of the control substantiated the protection rendered by the LMWH, certoparin. In short, the results suggest that the low-molecular-weight heparin derivative, certoparin exerts beneficial effects on the nitrosative status, and on the biological macromolecules as DNA and curtails the rise of the pro-apoptotic and pro-inflammatory cytokine, TNF-α in the cardiac and renal tissues.Item Biochemical changes accompanying apoptotic cell death in retinoblastoma cancer cells treated with lipogenic enzyme inhibitors(Elsiever, 2013) Deepa, P.R.Retinoblastoma (RB) is a malignant intra-ocular neoplasm that affects children (usually below the age of 5 years). 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.