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• W2414458688 endingPage "C839" @default.
• W2414458688 startingPage "C832" @default.
• W2414458688 abstract "The mechanism by which Bcl-2 inhibits cell death is unknown. It has been suggested that Bcl-2 functions as an antioxidant. Because Bcl-2 is localized mainly to the membranes of the endoplasmic reticulum (ER) and the mitochondria, which represent the main intracellular storage sites for Ca2+, we hypothesized that Bcl-2 might protect cells against oxidant injury by altering intracellular Ca2+ homeostasis. To test this hypothesis, we examined the effect of oxidant treatment on viability in normal rat kidney (NRK) cells and in NRK cells stably transfected with Bcl-2 in the presence or absence of intracellular Ca2+, and we compared the effect of Bcl-2 expression on oxidant-induced intracellular Ca2+ mobilization and on ER and mitochondrial Ca2+ pools. NRK cells transfected with Bcl-2 (NRK-Bcl-2) were significantly more resistant to H2O2-induced cytotoxicity than control cells. EGTA-AM, an intracellular Ca2+ chelator, as well as the absence of Ca2+ in the medium, reduced H2O2-induced cytotoxicity in both cell lines. Compared with controls, cells overexpressing Bcl-2 showed a delayed rise in intracellular Ca2+ concentration ([Ca2+]i) after H2O2 treatment. After treatment with the Ca2+ ionophore ionomycin, Bcl-2-transfected cells showed a much quicker decrease after the maximal rise than control cells, suggesting stronger intracellular Ca2+ buffering, whereas treatment with thapsigargin, an inhibitor of the ER Ca2+-ATPases, transiently increased [Ca2+]i in control and in Bcl-2-transfected cells. Estimates of mitochondrial Ca2+ stores using an uncoupler of oxidative phosphorylation show that NRK-Bcl-2 cells have a higher capacity for mitochondrial Ca2+ storage than control cells. In conclusion, Bcl-2 may prevent oxidant-induced cell death, in part, by increasing the capacity of mitochondria to store Ca2+." @default.
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• W2414458688 date "1998-09-01" @default.
• W2414458688 modified "2023-09-24" @default.
• W2414458688 title "Effect of Bcl-2 on oxidant-induced cell death and intracellular Ca²⁺mobilization" @default.
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• W2414458688 doi "https://doi.org/10.1152/ajpcell.1998.275.3.c832" @default.
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