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• W1980520942 endingPage "C395" @default.
• W1980520942 startingPage "C383" @default.
• W1980520942 abstract "A sustained increase in the cytosolic Ca(2+) concentration ([Ca(2+)](i)) can cause cell death. In this study, we found that, in cultured porcine aortic smooth muscle cells, endoplasmic reticulum (ER) stress, triggered by depletion of Ca(2+) stores by thapsigargin (TG), induced an increase in the [Ca(2+)](i) and cell death. However, the TG-induced death was not related to the [Ca(2+)](i) increase but was mediated by targeting of activated Bax to mitochondria and the opening of mitochondrial permeability transition pores (PTPs). Once the mitochondrial PTPs had opened, several events, including collapse of the mitochondrial membrane potential, cytochrome c release, and caspase-3 activation, occurred and the cells died. TG-induced cell death was completely inhibited by the pan-caspase inhibitor Z-VAD-fmk and was enhanced by the Ca(2+) chelator 1,2-bis(2-aminophenoxy)ethane-N,N,N',N'-tetraacetic acid (BAPTA), suggesting the existence of a Ca(2+)-dependent anti-apoptotic mechanism. After TG treatment, Ca(2+)-sensitive mitogen-activated protein kinase (MAPK) activation was induced and acted as a downstream effector of phosphatidylinositol 3-kinase (PI 3-kinase). The protective effect of Z-VAD-fmk on TG-induced cell death was reversed by BAPTA, PD-098059 (an MAPK kinase inhibitor), or LY-294002 (a PI 3-kinase inhibitor). Taken together, our data indicate that ER stress simultaneously activate two pathways, the mitochondrial caspase-dependent death cascade and the Ca(2+)-dependent PI 3-kinase/MAPK anti-apoptotic machinery. The Bax activation and translocation, but not the [Ca(2+)](i) increase, may activate mitochondrial PTPs, which, in turn, causes activation of caspases and cell death, whereas Ca(2+)-dependent MAPK activation counteracts death signaling; removal of Ca(2+) activated a second caspase-independent death pathway." @default.
• W1980520942 created "2016-06-24" @default.
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• W1980520942 date "2007-01-01" @default.
• W1980520942 modified "2023-09-23" @default.
• W1980520942 title "Dual effect of thapsigargin on cell death in porcine aortic smooth muscle cells" @default.
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• W1980520942 doi "https://doi.org/10.1152/ajpcell.00069.2006" @default.
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