Calcium-dependent O-GlcNAc signaling drives liver autophagy in adaptation to starvation.

Calcium-dependent O-GlcNAc signaling drives liver autophagy in adaptation to starvation.
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DOI:
10.1101/gad.305441.117
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发表时间:
2017-08-15
影响因子:
10.5
通讯作者:
Yang X
Yang X
中科院分区:
生物学1区
文献类型:
--
作者:
Ruan HB;Ma Y;Torres S;Zhang B;Feriod C;Heck RM;Qian K;Fu M;Li X;Nathanson MH;Bennett AM;Nie Y;Ehrlich BE;Yang X

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In this study, Ruan et al. demonstrate that O-GlcNAc transferase (OGT) is required for glucagon-stimulated liver autophagy and metabolic adaptation to starvation. Their findings delineate a new signaling pathway in which starvation promotes autophagy through OGT phosphorylation and establish the importance of O-GlcNAc signaling in coupling liver autophagy to nutrient homeostasis. Starvation induces liver autophagy, which is thought to provide nutrients for use by other organs and thereby maintain whole-body homeostasis. Here we demonstrate that O-linked β-N-acetylglucosamine (O-GlcNAc) transferase (OGT) is required for glucagon-stimulated liver autophagy and metabolic adaptation to starvation. Genetic ablation of OGT in mouse livers reduces autophagic flux and the production of glucose and ketone bodies. Upon glucagon-induced calcium signaling, calcium/calmodulin-dependent kinase II (CaMKII) phosphorylates OGT, which in turn promotes O-GlcNAc modification and activation of Ulk proteins by potentiating AMPK-dependent phosphorylation. These findings uncover a signaling cascade by which starvation promotes autophagy through OGT phosphorylation and establish the importance of O-GlcNAc signaling in coupling liver autophagy to nutrient homeostasis.
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