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A more recent version of this article appeared on March 1, 2004

Papers In Press, published online ahead of print December 1, 2003
J. Lipid Res., doi:10.1194/jlr.M300406-JLR200
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Submitted on September 23, 2003
Revised on November 14, 2003
Accepted on November 24, 2003

Haptoglobin release by human adipose tisssue in primary culture

John N. Fain, Suleiman W. Bahouth, and Atul K. Madan

Molecular Sciences, University of Tennessee Health Science Center, Memphis, TN 38163

Corresponding Author: jfain{at}utmem.edu

Haptoglobin is a putative adiposity marker since its concentration in blood is elevated in obese humans. The present studies examined haptoglobin release by explants of adipose tissue in primary culture. Haptoglobin was released by explants of human visceral and subcutaneous adipose tissue at a near linear rate over 48 h. Explants of visceral adipose tissue released more haptoglobin than did explants of subcutaneous adipose tissue. The release of haptoglobin was quite variable but there was a close correlation between haptoglobin release by visceral adipose tissue and that by explants of subcutaneous tissue from the same individual. Dexamethasone and niflumic acid, a cyclooxygenase-2 inhibitor, both inhibited haptoglobin release. There was release of haptoglobin by both isolated adipocytes and the adipose tissue matrix remaining after collagenase digestion of human adipose tissue. However, the amount of haptoglobin released by human adipose tissue explants in primary culture was quite low in relationship to the circulating level of haptoglobin.


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