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• W1996707930 abstract "The conventional calpains, m- and micro-calpain, are suggested to be involved in apoptosis triggered by many different mechanisms. However, it has not been possible to definitively associate calpain function with apoptosis, largely because of the incomplete selectivity of the cell permeable calpain inhibitors used in previous studies. In the present study, Chinese hamster ovary (CHO) cell lines overexpressing micro-calpain or the highly specific calpain inhibitor protein, calpastatin, have been utilized to explore apoptosis signals that are influenced by calpain content. This approach allows unambiguous alteration of calpain activity in cells. Serum depletion, treatment with the endoplasmic reticulum (ER) calcium ATPase inhibitor thapsigargin, and treatment with calcium ionophore A23187 produced apoptosis in CHO cells, which was increased in calpain overexpressing cells and decreased by induced expression of calpastatin. Inhibition of calpain activity protected beta-spectrin, but not alpha-spectrin, from proteolysis. The calpains seemed not to be involved in apoptosis triggered by a number of other treatments. Calpain protected against TNF-alpha induced apoptosis. In contrast to previous studies, we found no evidence that calpains proteolyze I kappa B-alpha in TNF-alpha-stimulated cells. These studies indicate that the conventional calpains participate in some, but not all, apoptotic signaling mechanisms. In most cases, they contributed to apoptosis, but in at least one case, they were protective." @default.
• W1996707930 created "2016-06-24" @default.
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• W1996707930 date "2002-06-01" @default.
• W1996707930 modified "2023-09-29" @default.
• W1996707930 title "Participation of the conventional calpains in apoptosis" @default.
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• W1996707930 doi "https://doi.org/10.1016/s0167-4889(02)00193-3" @default.
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