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Am J Physiol Regul Integr Comp Physiol 259: R184-R188, 1990;
0363-6119/90 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 259, Issue 1 184-R188, Copyright © 1990 by American Physiological Society

ARTICLES

Reduced adipsin mRNA and circulating adipsin protein are modulated by adrenal steroids in obese Zucker rats

P. R. Johnson, B. Spiegelman, B. Rosen, I. Turkenkopf, H. Ree and M. R. Greenwood
Department of Biology, Vassar College, Poughkeepsie, New York 12601.

We investigated expression of the adipose-specific serine protease adipsin in genetically obese Zucker rats and whether adrenalectomy modifies expression. Adipsin mRNA levels were determined by slot blot and Northern blot analysis of total RNA samples extracted from epididymal adipose tissue and isolated retroperitoneal adipocytes of obese (fa/fa) and homozygous lean (Fa/Fa) Zucker rats. Both 30-day-old and 4-mo-old animals were analyzed in experiment 1. In experiment 2, 10-wk-old obese and lean rats were either bilaterally adrenalectomized or sham operated, and adipsin mRNA levels were determined on tissue and cell samples 2 wk postsurgery. In both experiments, serum adipsin protein was determined by Western blot analysis and plasma insulin by radioimmunoassay. The data show that both adipsin mRNA and adipsin protein are reduced in obese compared with lean rats and that adrenalectomy restores these values toward normal in obese rats. The data thus suggest that adrenal steroids are involved in modulating adipsin expression in obese Zucker rats and that insulin may be an intermediary factor in such modulation.


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