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A microarray search for genes predominantly expressed in human omental adipocytes: adipose tissue as a major production site of serum amyloid A.

Journal article
Authors Kajsa Sjöholm
Jenny Palming
Louise Olofsson
Anders Gummesson
Per-Arne Svensson
Ted Lystig
Eva Jennische
John Brandberg
Jarl S Torgerson
Björn Carlsson
Lena M S Carlsson
Published in Journal of Clinical Endocrinology & Metabolism
Volume 90
Issue 4
Pages 2233-9
ISSN 0021-972X
Publication year 2005
Published at Wallenberg Laboratory
Institute of Anatomy and Cell Biology
Institute of Internal Medicine, Dept of Body Composition and Metabolism
Institute of Selected Clinical Sciences, Department of Radiology
Pages 2233-9
Language en
Links dx.doi.org/10.1210/jc.2004-1830
Subject categories Medical and Health Sciences

Abstract

To identify genes predominantly expressed in omental adipocytes, microarray expression profiles from 33 human tissues or cell types were analyzed, using an algorithm developed for identification of transcripts predominantly expressed in a certain tissue. Both known adipocyte-specific and more unexpected genes were among the 28 genes identified. To validate the approach, adipocyte expression of three of these genes, acute-phase serum amyloid A (A-SAA), aquaporin 7, and transport secretion protein-2.2, was compared with 17 other human tissues by real-time PCR. The unexpectedly high expression of A-SAA in adipocytes was further verified by Northern blot and immunohistochemistry. The liver, reported to be the main production site for A-SAA, displayed the second highest expression using microarray and real-time PCR. In obese subjects, adipose tissue mRNA and serum A-SAA levels were down-regulated during an 18-wk diet regime (P < 0.05 and P < 0.0001, respectively). A-SAA serum levels were highly correlated to adipose tissue mRNA levels (P < 0.001) and to the total (P < 0.0001) and sc (P < 0.0001) adipose tissue areas, as analyzed by computed tomography. We show that adipose tissue is a major expression site of A-SAA during the nonacute-phase reaction condition. This provides a direct link between adipose tissue mass and a marker for low-grade inflammation and cardiovascular risk.

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