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Brain glucose metabolism controls the hepatic secretion of triglyceride-rich lipoproteins.

Abstract：

:Increased production of very low-density lipoprotein (VLDL) is a critical feature of the metabolic syndrome. Here we report that a selective increase in brain glucose lowered circulating triglycerides (TG) through the inhibition of TG-VLDL secretion by the liver. We found that the effect of glucose required its conversion to lactate, leading to activation of ATP-sensitive potassium channels and to decreased hepatic activity of stearoyl-CoA desaturase-1 (SCD1). SCD1 catalyzed the synthesis of oleyl-CoA from stearoyl-CoA. Curtailing the liver activity of SCD1 was sufficient to lower the hepatic levels of oleyl-CoA and to recapitulate the effects of central glucose administration on VLDL secretion. Notably, portal infusion of oleic acid restored hepatic oleyl-CoA to control levels and negated the effects of both central glucose and SCD1 deficiency on TG-VLDL secretion. These central effects of glucose (but not those of lactate) were rapidly lost in diet-induced obesity. These findings indicate that a defect in brain glucose sensing could play a critical role in the etiology of the metabolic syndrome.

journal_name

Nat Med

journal_title

Nature medicine

authors

Lam TK,Gutierrez-Juarez R,Pocai A,Bhanot S,Tso P,Schwartz GJ,Rossetti L

doi

10.1038/nm1540

subject

Has Abstract

pub_date

2007-02-01 00:00:00

pages

171-80

issue

2

eissn

1078-8956

issn

1546-170X

pii

nm1540

journal_volume

13

pub_type

杂志文章

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