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• W2093340216 abstract "Apoptosis is mainly brought about by the activation of caspases, a protease family with unique substrate selectivity. In mammals, different complexes like the DISC complex or the apoptosome complexes have been delineated leading to the cleavage and thus activation of the executioner caspases. Although caspase-3 is the main executioner caspase in apoptosis induced by serum starvation in AKR-2B fibroblasts as demonstrated by affinity labeling with YVK(-bio)D.aomk and partial purification of cytosolic extracts by high performance ion exchange chromatography, its activation is apparently caused by a noncanonical pathway: (1) Expression of CrmA, an inhibitor of caspase-8, failed to suppress apoptosis; (2) There was no formation of high molecular weight complexes of Apaf-1 indicative for its activation. Furthermore no cleavage of caspase-9 was observed. But surprisingly, gelfiltration experiments revealed the distribution of caspase-3 and -6 into differently sized high molecular weight complexes during apoptosis. Though the apparent molecular weights of the complexes containing caspase-3 (600 kD for apoptosome and 250 kD for microapoptosome) are in accordance with recently published data, the activity profiles differ strikingly. In AKR-2B cells caspase-3 is mainly recovered as uncomplexed enzyme and in much lower levels in the apoptosomes. Remarkably, the 600 kD and 250 kD complexes containing activated caspase-3 were devoid of Apaf-1 and cytochrome c. In addition a new 450 kD complex containing activated caspase-6 was found that is clearly separated from the caspase-3 containing complexes. Furthermore, we disclose for the first time the activation of caspase-12 in response to serum starvation. Activated caspase-12 is detectable as non-complexed free enzyme in the cytosol." @default.
• W2093340216 created "2016-06-24" @default.
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• W2093340216 date "2002-02-01" @default.
• W2093340216 modified "2023-10-06" @default.
• W2093340216 title "Formation of noncanonical high molecular weight caspase-3 and -6 complexes and activation of caspase-12 during serum starvation induced apoptosis in AKR-2B mouse fibroblasts" @default.
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• W2093340216 doi "https://doi.org/10.1038/sj.cdd.4400968" @default.
• W2093340216 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/11840163" @default.
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