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2001 ; 9
(4-5
): 195-201
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Hsp27 inhibits cytochrome c-mediated caspase activation by sequestering both
pro-caspase-3 and cytochrome c
#MMPMID11444529
Concannon CG
; Orrenius S
; Samali A
Gene Expr
2001[]; 9
(4-5
): 195-201
PMID11444529
show ga
Mitochondrial cytochrome c release in response to pro-apoptotic signals leads to
the formation of a cytochrome c/Apaf-1/procaspase-9 complex (the apoptosome) and
resultant activation of caspase-9 and caspase-3. Here we demonstrate that the
molecular chaperone, Hsp27, inhibits this cytochrome c-mediated activation of
caspase-3. Immunodepeletion of Hsp27 from cytochrome c-activated cytosols
resulted in decreased caspase activity. Furthermore, immunoprecipitation of Hsp27
resulted in the coprecipitation of both cytochrome c and procaspase-3. In
reciprocal experiments, immunoprecipitation of both procaspase-3 and cytochrome c
resulted in coprecipitation of Hsp27, indicating two independent interactions.
These results point to Hsp27 mediating its inhibition of procaspase-3 activation
through its ability to sequester both cytochrome c and procaspase-3, and thus
prevent the correct formation/function of the apoptosome complex.