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2014 ; 20
(4
): 626-38
Nephropedia Template TP
gab.com Text
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English Wikipedia
Let-7 coordinately suppresses components of the amino acid sensing pathway to
repress mTORC1 and induce autophagy
#MMPMID25295787
Dubinsky AN
; Dastidar SG
; Hsu CL
; Zahra R
; Djakovic SN
; Duarte S
; Esau CC
; Spencer B
; Ashe TD
; Fischer KM
; MacKenna DA
; Sopher BL
; Masliah E
; Gaasterland T
; Chau BN
; Pereira de Almeida L
; Morrison BE
; La Spada AR
Cell Metab
2014[Oct]; 20
(4
): 626-38
PMID25295787
show ga
Macroautophagy (hereafter autophagy) is the major pathway by which macromolecules
and organelles are degraded. Autophagy is regulated by the mTOR signaling
pathway-the focal point for integration of metabolic information, with mTORC1
playing a central role in balancing biosynthesis and catabolism. Of the various
inputs to mTORC1, the amino acid sensing pathway is among the most potent. Based
upon transcriptome analysis of neurons subjected to nutrient deprivation, we
identified let-7 microRNA as capable of promoting neuronal autophagy. We found
that let-7 activates autophagy by coordinately downregulating the amino acid
sensing pathway to prevent mTORC1 activation. Let-7 induced autophagy in the
brain to eliminate protein aggregates, establishing its physiological relevance
for in vivo autophagy modulation. Moreover, peripheral delivery of let-7 anti-miR
repressed autophagy in muscle and white fat, suggesting that let-7 autophagy
regulation extends beyond CNS. Hence, let-7 plays a central role in nutrient
homeostasis and proteostasis regulation in higher organisms.