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Am J Physiol Endocrinol Metab 241: E238-E245, 1981;
0193-1849/81 $5.00
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AJP - Endocrinology and Metabolism, Vol 241, Issue 3 238-E245, Copyright © 1981 by American Physiological Society

ARTICLES

Protein synthesis in liver and small intestine in protein deprivation and diabetes

M. A. McNurlan and P. J. Garlick

Protein synthesis (as a percent of the protein pool synthesized per day) has been measured in liver and small intestine of young male rats from the incorporation of 100 mumol [1-14C]leucine/100 g body wt into protein over 10 min. Dietary protein deprivation for 8 days depressed protein synthesis in liver (30%), jejunal mucosa (20%), and jejunal serosa (25%). In serosa, reduced levels of RNA relative to protein could account for altered synthesis; in liver and mucosa, the amount of protein synthesized per unit RNA was reduced. In liver of streptozotocin-diabetic rats protein synthesis was depressed 45%, whereas it was maintained in jejunal mucosa and serosa. Depressed synthesis in liver was accompanied by both a loss of RNA relative to protein and a reduction in the protein synthesized per RNA.


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