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. 1993 Jun 15;292(Pt 3):873–876. doi: 10.1042/bj2920873

Adipose tissues from various anatomical sites are characterized by different patterns of gene expression and regulation.

B Cousin 1, L Casteilla 1, C Dani 1, P Muzzin 1, J P Revelli 1, L Penicaud 1
PMCID: PMC1134195  PMID: 8318015

Abstract

We have shown previously the presence of brown adipocytes among white fat pads, and proposed the existence of a spectrum of adipose depots according to the abundance of brown fat cells [Cousin, Cinti, Morroni, Raimbault, Ricquier, Pénicaud and Casteilla (1992) J. Cell Sci. 103, 931-942]. In this study, we tried to characterize this spectrum better. We determined in several adipose depots (i) the richness of pre-adipose cells, as assessed by A2COL6 mRNA levels; (ii) whether a fat pad was characterized by a pattern of mRNA expression; (iii) whether this pattern was close related to abundance of brown adipocytes, and (iv) whether the regulation of this pattern by catecholamines under cold exposure or beta-agonist treatment was similar in the different pads. This was achieved by studying proteins involved in glucose and lipid metabolism such as insulin-sensitive glucose transporter (GLUT4), fatty acid synthase, lipoprotein lipase and fatty acid binding protein aP2, as well as beta 3-adrenergic-receptor expression. Among white adipose depots, the periovarian fat pad was characterized by the highest content of pre-adipocytes and of brown adipocytes, and inguinal fat by the highest lipogenic activity potential. There was no close correlation between beta 3-adrenergic-receptor expression and brown adipocyte content in the tissues, as measured by the degree of uncoupling protein (UCP) gene expression. However, in pads expressing UCP mRNA, mRNA levels of beta 3-adrenergic receptor and other markers were increased in parallel. Under cold exposure or beta 3-agonist treatment, a specific up-regulation of GLUT4 expression was observed in interscapular brown adipose tissue. The regional difference described in this study, could participate in preferential fat-pad growth under physiological conditions as well as in pathological situations.

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Selected References

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