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2014 ; 55
(6
): 916-930
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Functional role of autophagy-mediated proteome remodeling in cell survival
signaling and innate immunity
#MMPMID25175026
Mathew R
; Khor S
; Hackett SR
; Rabinowitz JD
; Perlman DH
; White E
Mol Cell
2014[Sep]; 55
(6
): 916-930
PMID25175026
show ga
Ras-driven cancer cells upregulate basal autophagy that degrades and recycles
intracellular proteins and organelles. Autophagy-mediated proteome degradation
provides free amino acids to support metabolism and macromolecular synthesis,
which confers a survival advantage in starvation and promotes tumorigenesis.
While the degradation of isolated protein substrates by autophagy has been
implicated in controlling cellular function, the extent and specificity by which
autophagy remodels the cellular proteome and the underlying functional
consequences were unknown. Here we compared the global proteome of
autophagy-functional and -deficient Ras-driven cancer cells, finding that
autophagy affects the majority of the proteome yet is highly selective. While
levels of vesicle trafficking proteins important for autophagy are preserved
during starvation-induced autophagy, deleterious inflammatory response pathway
components are eliminated even under basal conditions, preventing
cytokine-induced paracrine cell death. This reveals the global, functional impact
of autophagy-mediated proteome remodeling on cell survival and identifies
critical autophagy substrates that mediate this process.