Abstract:
:The proteins of 14-3-3 family are substantially involved in the regulation of many biological processes including the apoptosis. We studied the changes in the expression of five 14-3-3 isoforms (beta, gamma, epsilon, tau, and zeta) during the apoptosis of JURL-MK1 and K562 cells. The expression level of all these proteins markedly decreased in relation with the apoptosis progression and all isoforms underwent truncation, which probably corresponds to the removal of several C-terminal amino acids. The observed 14-3-3 modifications were partially blocked by caspase-3 inhibition. In addition to caspases, a non-caspase protease is likely to contribute to 14-3-3's cleavage in an isoform-specific manner. While 14-3-3 gamma seems to be cleaved mainly by caspase-3, the alternative mechanism is essentially involved in the case of 14-3-3 tau, and a combined effect was observed for the isoforms epsilon, beta, and zeta. We suggest that the processing of 14-3-3 proteins could form an integral part of the programmed cell death or at least of some apoptotic pathways.
journal_name
J Cell Biochemjournal_title
Journal of cellular biochemistryauthors
Kuzelová K,Grebenová D,Pluskalová M,Kavan D,Halada P,Hrkal Zdoi
10.1002/jcb.22061subject
Has Abstractpub_date
2009-03-01 00:00:00pages
673-81issue
4eissn
0730-2312issn
1097-4644journal_volume
106pub_type
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