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• W2145052014 abstract "ABSTRACT. In hypoxia, ATP depletion causes cellular Ca2+ increase, mitochondrial injury, and apoptosis in renal tubular cells. However, the molecular basis of these observations is incompletely delineated. IRPTC, a rat renal proximal tubular cell line, was treated with antimycin A, and disturbances in cytoplasmic calcium ([Ca2+]c) and mitochondrial calcium ion concentration ([Ca2+]m), dissipation of mitochondrial membrane potential (ΔΨm), cytochrome c release, and resultant apoptosis were examined. Pharmacologic targeting of L-type Ca2+ channels in vitro and in vivo was used to clarify the involvement of voltage-dependent Ca2+ channels during this process. In vitro studies indicated that ATP depletion–induced apoptosis was preceded by increased [Ca2+]c and [Ca2+]m before activation of mitochondrial signaling. Antagonizing L-type Ca2+ channels offset these findings, suggesting [Ca2+]c and [Ca2+]m involvement. Azelnidipine administration ameliorated cellular and mitochondrial Ca2+ accumulation, mitochondrial permeability transition, cytochrome c release, caspase-9 activation, and resultant apoptosis (15.8 ± 0.8% versus 8.9 ± 0.7%; P < 0.01). Similar effects of azelnidipine were substantiated in an in vivo ischemia/reperfusion injury model. There were fewer terminal-deoxynucleotidyl transferase mediated dUTP nick-end labeling–positive cells in the azelnidipine-treated group (0.322 ± 0.038/tubule) as compared with the vehicle-treated group (0.450 ± 0.041; P < 0.05), although the antiapoptotic effect was smaller in vivo than in vitro, partly as a result of distinct levels of Bax expression. It is proposed that voltage-dependent Ca2+ channels are involved in cellular and mitochondrial accumulation of Ca2+ subsequent to ATP depletion and play an important role in regulating mitochondrial permeability transition, cytochrome c release, caspase activation, and apoptosis." @default.
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• W2145052014 date "2004-09-01" @default.
• W2145052014 modified "2023-10-14" @default.
• W2145052014 title "Blockade of Calcium Influx through L-Type Calcium Channels Attenuates Mitochondrial Injury and Apoptosis in Hypoxic Renal Tubular Cells" @default.
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• W2145052014 doi "https://doi.org/10.1097/01.asn.0000138287.46849.82" @default.
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