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- W2007209435 abstract "Abstract: In the present study, we investigated whether melatonin would prevent nitric oxide (NO)-induced apoptotic death of PGT-β immortalized pineal cells. To examine the protective effect of melatonin, cytotoxicity assay, DNA fragmentation analysis, caspase-3 activity assay, and Western blotting for caspase-3 and poly(ADP-ribose) polymerase (PARP) were performed. Treatment of cells with S-nitroso-N-acetylpenicillamine (SNAP), an NO donor, was shown to induce apoptotic cell death in a dose-dependent manner, and pretreatment with melatonin (0.1 mm) attenuated the occurrence of NO-induced apoptotic cell death. DNA fragmentation in response to NO was also arrested by melatonin. Caspase-3 activity induced by NO was decreased with melatonin treatment. Furthermore, the active fragments of caspase-3 and PARP were almost completely absent following exposure to melatonin. To elucidate the protective mechanisms of action of melatonin, Western blot analyses for Bcl-2 expression and cytochrome c release were carried out. Pretreatment with melatonin (0.1 mm) induced the expression of Bcl-2 and suppressed the release of cytochrome c into the cytosol, thereby arresting NO-induced apoptotic cell death. These results suggest that the antiapoptotic effect of melatonin is associated with induction of Bcl-2 expression in PGT-β cells, which in turn blocks caspase-3 activation and inhibits cytochrome c release into the cytosol." @default.
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- W2007209435 date "2002-09-06" @default.
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- W2007209435 title "Melatonin suppresses NO-induced apoptosis via induction of Bcl-2 expression in PGT-β immortalized pineal cells" @default.
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- W2007209435 doi "https://doi.org/10.1034/j.1600-079x.2002.02899.x" @default.
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