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2015 ; 112
(16
): 5017-22
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A cytosolic heat shock protein 90 and cochaperone CDC37 complex is required for
RIP3 activation during necroptosis
#MMPMID25852146
Li D
; Xu T
; Cao Y
; Wang H
; Li L
; Chen S
; Wang X
; Shen Z
Proc Natl Acad Sci U S A
2015[Apr]; 112
(16
): 5017-22
PMID25852146
show ga
Receptor-interacting protein kinase 3, RIP3, and a pseudokinase mixed lineage
kinase-domain like protein, MLKL, constitute the core components of the
necroptosis pathway, which causes programmed necrotic death in mammalian cells.
Latent RIP3 in the cytosol is activated by several upstream signals including the
related kinase RIP1, which transduces signals from the tumor necrosis factor
(TNF) family of cytokines. We report here that RIP3 activation following the
induction of necroptosis requires the activity of an HSP90 and CDC37 cochaperone
complex. This complex physically associates with RIP3. Chemical inhibitors of
HSP90 efficiently block necroptosis by preventing RIP3 activation. Cells with
knocked down CDC37 were unable to respond to necroptosis stimuli. Moreover, an
HSP90 inhibitor that is currently under clinical development as a cancer therapy
was able to prevent systemic inflammatory response syndrome in rats treated with
TNF-?. HSP90 and CDC37 cochaperone complex-mediated protein folding is thus an
important part of the RIP3 activation process during necroptosis.