Fatty liver of growing rats fed excess lysine and its prevention by adenine or allopurinol |
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Authors: | E A Ulman K H Ifft F W Kari W J Visek |
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Affiliation: | (1) School of Clinical Medicine, University of Illinois, 61801 Urbana, IL;(2) Present address: Department of Nutrition, Rutgers University, Cook College, 08903 New Brunswick, NJ |
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Abstract: | Weanling male Sprague-Dawley rats were fed ad libitum 15% casein diets with and without 5.0% lysine-HCl, 0.25% adenine sulfate
or 0.1% allopurinol for 2 weeks. Addition of lysine alone depressed 2-week growth from 94 to 65 g, increased average daily
urinary orotic acid excretion from 0.39 to 1.77 mg and increased the percentage of total liver lipids from 3.6 to 11.2. Adenine
or allopurinol did not change growth but markedly enhanced lysine-induced orotic aciduria and completely prevented lysine-induced
fatty livers. Reports by others show that adenine and allopurinol also prevent fatty livers of rats fed arginine-free diets
or excess orotic acid. The authors conclude that lysine-induced orotic aciduria results from arginine deficiency caused by
antagonism of arginine function by lysine, and that lysine-induced fatty liver probably results from a lesion identifical
to that produced by feeding excess orotic acid. |
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