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Am J Physiol Regul Integr Comp Physiol 269: R896-R903, 1995;
0363-6119/95 $5.00
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AJP - Regulatory, Integrative and Comparative Physiology, Vol 269, Issue 4 896-R903, Copyright © 1995 by American Physiological Society

ARTICLES

Dopamine D1 or D2 antagonists enhance inhibition of consummatory ingestive behavior by CCK-8

I. Bednar, H. Carrer, G. A. Qureshi and P. Sodersten
Department of Clinical Neuroscience, Karolinska Institute, Novum, Huddinge, Sweden.

A dopamine D1 (SKF-38393, 1 mg)- or D2 (LY-171555, 0.1 mg)-receptor agonist inhibited intake of an intraorally infused solution of sucrose by male rats, a test of consummatory ingestive behavior. Treatment with a D1 (SCH-39166, 0.1 mg) or D2 (raclopride, 0.6 mg) antagonist reversed inhibition by the respective agonist but enhanced the inhibitory effect of cholecystokinin octapeptide (CCK-8; 1.8 micrograms). It was not possible to demonstrate specific effects of D1 and D2 agonists on intake of pellets, a test that does not discriminate consummatory ingestive behavior from appetitive ingestive behavior, i.e., behavior used to obtain food. The results demonstrate specific involvement of dopamine D1 and D2 receptors in inhibition of consummatory ingestive behavior.


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