Abstract
The function of key components of signal transduction, the Src family tyrosine kinases is dependent on catalytic activity as well as on intermolecular interaction achieved by their SH2 and SH3 modular domains. We have analyzed the effect of overexpression of the hematopoietic cell kinase (Hck) and its N-terminal unique and SH3 domains on cell survival. Overexpression of the N-terminal unique and SH3 domains (Hck-USH3) induced about 25% of expressing Cos-1 cells to undergo apoptosis 30 hrs after transfection. The full length p59 and p56 forms and the unique domain alone induced low levels of cell death. The unique and SH3 domain of a closely related kinase, Lyn did not induce apoptosis. Overexpression of a mutant USH3 domain (Gly → Ala), that disrupts membrane localization, did not induce high level of apoptosis. Cells overexpressing Hck-USH3 showed activation of caspase-3 and release of cytochrome c from mitochondria into cytosol. Caspase-3 defective MCF-7 cells were resistant to apoptosis and cytochrome c release induced by Hck-USH3, which were restored by introducing the caspase-3 gene. These results suggest that Hck SH3 domain mediated signalling at the plasma membrane triggers a pathway leading to caspase-3 dependent cyto- chrome c release and apoptosis.
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Radha, V., Sudhakar, C., Ray, P. et al. Induction of cytochrome c release and apoptosis by Hck-SH3 domain-mediated signalling requires caspase-3. Apoptosis 7, 195–207 (2002). https://doi.org/10.1023/A:1015370512425
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DOI: https://doi.org/10.1023/A:1015370512425