The Baf60c/Deptor pathway links skeletal muscle inflammation to glucose homeostasis in obesity.

Abstract:

:Skeletal muscle insulin resistance in type 2 diabetes is associated with a shift from oxidative to glycolytic metabolism in myofibers. However, whether this metabolic switch is detrimental or adaptive for metabolic homeostasis has not been resolved. We recently demonstrated that the Baf60c/Deptor pathway promotes glycolytic metabolism in the muscle and protects mice from diet-induced insulin resistance. However, the nature of the signals that impinge on this pathway and the role of Baf60c in glucose homeostasis in the severe insulin-resistant state remain unknown. Here we show that expression of Baf60c and Deptor was downregulated in skeletal muscle in obesity, accompanied by extracellular signal-related kinase (ERK) activation. In cultured myotubes, inhibition of ERK, but not Jun NH2-terminal kinase and IκB kinase, blocked the downregulation of Baf60c and Deptor by the proinflammatory cytokine tumor necrosis factor-α. Treatment of obese mice with the ERK inhibitor U0126 rescued Baf60c and Deptor expression in skeletal muscle and lowered blood glucose. Transgenic rescue of Baf60c in skeletal muscle restored Deptor expression and Akt phosphorylation and ameliorated insulin resistance in ob/ob mice. This study identifies the Baf60c/Deptor pathway as a target of proinflammatory signaling in skeletal muscle that may link meta-inflammation to skeletal myofiber metabolism and insulin resistance.

journal_name

Diabetes

journal_title

Diabetes

authors

Meng ZX,Wang L,Xiao Y,Lin JD

doi

10.2337/db13-1061

subject

Has Abstract

pub_date

2014-05-01 00:00:00

pages

1533-45

issue

5

eissn

0012-1797

issn

1939-327X

pii

db13-1061

journal_volume

63

pub_type

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