Overexpression of adiponectin targeted to adipose tissue in transgenic mice: impaired adipocyte differentiation.

Abstract:

:Adiponectin (ApN) is an adipokine whose expression and plasma levels are inversely related to obesity and insulin-resistant states. Chronic repercussions of ApN treatment or overexpression on adiposity and body weight are still controversial. Here, we generated a transgenic (Tg) mouse model allowing persistent and moderate overexpression of native full-length ApN targeted to white adipose tissue. Adipose mass and adipocyte size of Tg mice were reduced despite preserved calorie intake. This reduction resulted from increased energy expenditure and up-regulation of uncoupling proteins, and from abrogation of the adipocyte differentiation program, as shown by the loss of a key lipogenic enzyme and of adipocyte markers. Adipose mass remodeling favors enhanced insulin sensitivity and improved lipid profile of Tg mice. Alteration of the adipocyte phenotype was likely to result from increased expression of the preadipocyte factor-1 and from down-regulation of the transcription factor, CCAAT/enhancer binding protein-alpha, which orchestrates adipocyte differentiation. We further found that recombinant ApN directly stimulated pre- adipocyte factor-1 mRNA and attenuated CCAAT/enhancer binding protein-alpha expression in cultured 3T3-F442A cells. Conversely, opposite changes in the expression of these genes were observed in white fat of ApN-deficient mice. Thus, besides enhanced energy expenditure, our work shows that impairment of adipocyte differentiation contributes to the anti-adiposity effect of ApN.

journal_name

Endocrinology

journal_title

Endocrinology

authors

Bauche IB,El Mkadem SA,Pottier AM,Senou M,Many MC,Rezsohazy R,Penicaud L,Maeda N,Funahashi T,Brichard SM

doi

10.1210/en.2006-0838

subject

Has Abstract

pub_date

2007-04-01 00:00:00

pages

1539-49

issue

4

eissn

0013-7227

issn

1945-7170

pii

en.2006-0838

journal_volume

148

pub_type

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