C3H/HeJ mice carrying a toll-like receptor 4 mutation are protected against the development of insulin resistance in white adipose tissue in response to a high-fat diet.

Abstract:

AIMS/HYPOTHESIS:Inflammation is associated with obesity and has been implicated in the development of diabetes and atherosclerosis. During gram-negative bacterial infection, lipopolysaccharide causes an inflammatory reaction via toll-like receptor 4 (TLR4), which has an essential function in the induction of innate and adaptative immunity. Our aim was to determine what role TLR4 plays in the development of metabolic phenotypes during high-fat feeding. MATERIALS AND METHODS:We evaluated metabolic consequences of a high-fat diet in TLR4 mutant mice (C3H/HeJ) and their respective controls. RESULTS:TLR4 inactivation reduced food intake without significant modification of body weight, but with higher epididymal adipose tissue mass and adipocyte hypertrophy. It also attenuated the inflammatory response and increased glucose transport and the expression levels of adiponectin and lipogenic markers in white adipose tissue. In addition, TLR4 inactivation blunted insulin resistance induced by lipopolysaccharide in differentiated adipocytes. Increased feeding efficiency in TLR4 mutant mice was associated with lower mass and lower expression of uncoupling protein 1 gene in brown adipose tissue. Finally, TLR4 inactivation slowed the development of hepatic steatosis, reducing the liver triacylglycerol content and also expression levels of lipogenic and fibrosis markers. CONCLUSIONS/INTERPRETATION:TLR4 influences white adipose tissue inflammation and insulin sensitivity, as well as liver fat storage, and is important in the regulation of metabolic phenotype during a fat-enriched diet.

journal_name

Diabetologia

journal_title

Diabetologia

authors

Poggi M,Bastelica D,Gual P,Iglesias MA,Gremeaux T,Knauf C,Peiretti F,Verdier M,Juhan-Vague I,Tanti JF,Burcelin R,Alessi MC

doi

10.1007/s00125-007-0654-8

subject

Has Abstract

pub_date

2007-06-01 00:00:00

pages

1267-76

issue

6

eissn

0012-186X

issn

1432-0428

journal_volume

50

pub_type

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