The roles of caspase-3 and bcl-2 in chemically-induced apoptosis but not necrosis of renal epithelial cells

Y Zhan, B van de Water, Y Wang, JL Stevens - Oncogene, 1999 - nature.com
Y Zhan, B van de Water, Y Wang, JL Stevens
Oncogene, 1999nature.com
The kidney is a target for toxicants including cisplatin and S-(1, 2-dichlorovinyl)-L-cysteine
(DCVC), a metabolite of the environmental contaminant, trichloroethylene. Necrosis is well
characterized in kidney cells, but pathways leading to apoptosis are less clear. Cysteine
conjugates are useful toxicants because they induce either necrosis or apoptosis depending
on chemical structure or antioxidant status. Herein, we show that in the renal epithelial cell
line LLC-PK1, activation of caspase-3 (CPP32/Yama/apopain) is crucial for apoptosis, but …
Abstract
The kidney is a target for toxicants including cisplatin and S-(1, 2-dichlorovinyl)-L-cysteine (DCVC), a metabolite of the environmental contaminant, trichloroethylene. Necrosis is well characterized in kidney cells, but pathways leading to apoptosis are less clear. Cysteine conjugates are useful toxicants because they induce either necrosis or apoptosis depending on chemical structure or antioxidant status. Herein, we show that in the renal epithelial cell line LLC-PK1, activation of caspase-3 (CPP32/Yama/apopain) is crucial for apoptosis, but not necrosis. Apoptosis was blocked by zVAD. fmk, and partially by a cathepsin inhibitor. Caspase-3 activity and cleavage of poly (ADP-ribose) polymerase (PARP) was detected only during apoptosis. S-(1, 1, 2, 2-Tetrafluoroethyl)-L-cysteine (TFEC), a metabolite of tetrafluoroethylene, kills cells only by necrosis, and did not activate caspases under any conditions. Apoptosis and activation of caspase-3 by cisplatin, but not DCVC, was prevented by bcl-2. Thus, caspase-3 activation by bcl-2-dependent and-independent mechanisms is a terminal event in chemical-apoptosis of renal epithelial cells.
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