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Am J Physiol Endocrinol Metab 271: E333-E339, 1996;
0193-1849/96 $5.00
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AJP - Endocrinology and Metabolism, Vol 271, Issue 2 E333-E339, Copyright © 1996 by American Physiological Society

ARTICLES

Regulation of obese gene expression in KK mice and congenic lethal yellow obese KKAy mice

M. Hayase, Y. Ogawa, G. Katsuura, H. Shintaku, K. Hosoda and K. Nakao
Shionogi Research Laboratories, Osaka, Japan.

To elucidate the regulation of obese (ob) gene expression in obesity and diabetes, we examined ob gene expression in KK mice and congenic lethal yellow obese KKAy mice. Northern blot analysis revealed that the ob mRNA levels are roughly equivalent in each of the epididymal, mesenteric, and subcutaneous white adipose tissue (WAT) from KK and KKAy mice at 4 wk of age, when the obese phenotype of KKAy mice was not apparent. Expression of the ob gene was augmented in the mesenteric and subcutaneous WAT but was unchanged in the epididymal WAT in KKAy mice at 12 wk of age, when KKAy mice developed marked obesity with hyperglycemia, hyperlipidemia, and hyperinsulinemia. The ob gene expression was also examined during fasting in 12-wk-old KK and KKAy mice. After 24 or 72 h of fasting in both mouse strains, ob gene expression was downregulated in the epididymal and mesenteric WAT but was unchanged in the subcutaneous WAT. The present study demonstrates that adipose tissue expression of the ob gene is regulated depending on the nutritional status in KK and KKAy mice.


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