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Dok1 mediates high-fat diet-induced adipocyte hypertrophy and obesity through modulation of PPAR-gamma phosphorylation.

Abstract：

:Insulin receptor substrate (IRS)-1 and IRS-2 have dominant roles in the action of insulin, but other substrates of the insulin receptor kinase, such as Gab1, c-Cbl, SH2-B and APS, are also of physiological relevance. Although the protein downstream of tyrosine kinases-1 (Dok1) is known to function as a multisite adapter molecule in insulin signaling, its role in energy homeostasis has remained unclear. Here we show that Dok1 regulates adiposity. Expression of Dok1 in white adipose tissue was markedly increased in mice fed a high-fat diet, whereas adipocytes lacking this adapter were smaller and showed a reduced hypertrophic response to this dietary manipulation. Dok1-deficient mice were leaner and showed improved glucose tolerance and insulin sensitivity compared with wild-type mice. Embryonic fibroblasts from Dok1-deficient mice were impaired in adipogenic differentiation, and this defect was accompanied by an increased activity of the protein kinase ERK and a consequent increase in the phosphorylation of peroxisome proliferator-activated receptor (PPAR)-gamma on Ser112. Mutation of this negative regulatory site for the transactivation activity of PPAR-gamma blocked development of the lean phenotype caused by Dok1 ablation. These results indicate that Dok1 promotes adipocyte hypertrophy by counteracting the inhibitory effect of ERK on PPAR-gamma and may thus confer predisposition to diet-induced obesity.

journal_name

Nat Med

journal_title

Nature medicine

authors

Hosooka T,Noguchi T,Kotani K,Nakamura T,Sakaue H,Inoue H,Ogawa W,Tobimatsu K,Takazawa K,Sakai M,Matsuki Y,Hiramatsu R,Yasuda T,Lazar MA,Yamanashi Y,Kasuga M

doi

10.1038/nm1706

subject

Has Abstract

pub_date

2008-02-01 00:00:00

pages

188-93

issue

2

eissn

1078-8956

issn

1546-170X

pii

nm1706

journal_volume

14

pub_type

杂志文章

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