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Am J Physiol Regul Integr Comp Physiol 268: R520-R527, 1995;
0363-6119/95 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 268, Issue 2 520-R527, Copyright © 1995 by American Physiological Society

ARTICLES

Diet-independent suppression of ingestive behavior by cholecystokinin octapeptide and amino acids

A. H. Mamoun, B. Anderstam, J. Bergstrom, G. A. Qureshi and P. Sodersten
Department of Renal Medicine, Karolinska Institute, Huddinge, Sweden.

Male rats consumed much more of an intraorally administered mixed protein, fat and carbohydrate solution than of a carbohydrate solution. Injection of cholecystokinin octapeptide (CCK-8, 0.6-5.0 microgram) suppressed intake of both solutions, but the CCK-A receptor antagonist L-364, 718 (20-40 micrograms) facilitated only carbohydrate intake. Blood levels of CCK-8 were higher after intake of the carbohydrate than the mixed solution. Blood levels of isoleucine, leucine, lysine, threonine, valine, and tryptophan increased only after intake of the mixed solution. Injection of these amino acids suppressed intake of both solutions. Blood levels of amino acids were also less after the seventh than after the first session ingesting the mixed solution. Treatment with CCK-8 or amino acids inhibits intake of any diet, but when secreted endogenously, these signals may terminate the meal in a diet-dependent manner.


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