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• W2076277952 abstract "Calcium channel antagonists have been reported to have a favorable impact on cyclosporin A (CsA)-treated kidney transplant recipients. However, it is not clear whether this is because of their direct effect on antagonizing the toxicity of CsA to renal tubular cells. In this study, we have used Madin-Darby canine kidney tubular cells as a model to examine the effect of diltiazem, a calcium channel antagonist, on CsA-induced apoptosis. Moreover, to investigate the possible regulation of CsA cytotoxicity by intracellular calcium level, the effect of the calcium ionophore A23187 on CsA-induced apoptosis was also examined. We found that treatment of CsA (20 microM) alone caused 20-30% cell death, which was apparently (30-40%) enhanced by diltiazem at 100 microg/ml, accompanied by more severe DNA fragmentation, activation of caspases, and a decreased level of Bcl-2. The caspase inhibitor ZVAD-fmk or Bcl-2 overexpression was capable of suppressing apoptosis induced by the synergistic effect of diltiazem and CsA. Moreover, the survival rate of cells treated with CsA (30 microM) alone remained only 30%, however, it was markedly (approximately 40%) elevated by co-treatment with A23187 (75 ng/ml). The rescue of cells from CsA-induced apoptosis by A23187 was correlated with AKT activation, BAD phosphorylation, and caspase-3 inactivation. Taken together, our results suggest that the reported favorable impact of diltiazem on kidney grafts is likely not because of its direct protection on renal tubular cells. Instead, it enhances the toxicity of CsA to renal tubular cells. In addition, our findings raise a possibility that the intracellular calcium level and the AKT pathway may participate in the regulation of CsA cytotoxicity." @default.
• W2076277952 created "2016-06-24" @default.
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• W2076277952 date "2002-03-14" @default.
• W2076277952 modified "2023-10-17" @default.
• W2076277952 title "Effect of calcium channel antagonist diltiazem and calcium ionophore A23187 on cyclosporine A-induced apoptosis of renal tubular cells" @default.
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• W2076277952 doi "https://doi.org/10.1016/s0014-5793(02)02563-2" @default.
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