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Cholecystokinin Modulates the Release of Dopamine from the Anterior and Posterior Nucleus Accumbens by Two Different Mechanisms

Cholecystokinin Modulates the Release of Dopamine from the Anterior and Posterior Nucleus... Abstract: The effects of various cholecystokinin (CCK)‐related peptides were investigated on 35 mM K+ ‐stimulated endogenous dopamine release from slices of either anterior or posterior nucleus accumbens of the rat. CCK sulphated octapeptide (1–10 μM), but not pentagastrin or CCK unsulphated octapeptide, was found to cause a dose‐dependent increase in the release from the posterior nucleus accumbens. This effect was blocked by low doses of the CCKA receptor antagonist L364,718 (10 nM) but not the CCKB receptor antagonist L365,260. In the anterior nucleus accumbens CCK sulphated octapeptide (1 μM) and CCK unsulphated octapeptide (0.1–1 μM) inhibited the dopamine release, and this effect was blocked by L365,260 (10–100 nM) but not by L364,718. These results suggest that CCK has a different effect on dopamine release from the anterior and posterior nucleus accumbens and that these effects are mediated by two different types of CCK receptor. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Neurochemistry Wiley

Cholecystokinin Modulates the Release of Dopamine from the Anterior and Posterior Nucleus Accumbens by Two Different Mechanisms

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References (33)

Publisher
Wiley
Copyright
Copyright © 1991 Wiley Subscription Services, Inc., A Wiley Company
ISSN
0022-3042
eISSN
1471-4159
DOI
10.1111/j.1471-4159.1991.tb02009.x
Publisher site
See Article on Publisher Site

Abstract

Abstract: The effects of various cholecystokinin (CCK)‐related peptides were investigated on 35 mM K+ ‐stimulated endogenous dopamine release from slices of either anterior or posterior nucleus accumbens of the rat. CCK sulphated octapeptide (1–10 μM), but not pentagastrin or CCK unsulphated octapeptide, was found to cause a dose‐dependent increase in the release from the posterior nucleus accumbens. This effect was blocked by low doses of the CCKA receptor antagonist L364,718 (10 nM) but not the CCKB receptor antagonist L365,260. In the anterior nucleus accumbens CCK sulphated octapeptide (1 μM) and CCK unsulphated octapeptide (0.1–1 μM) inhibited the dopamine release, and this effect was blocked by L365,260 (10–100 nM) but not by L364,718. These results suggest that CCK has a different effect on dopamine release from the anterior and posterior nucleus accumbens and that these effects are mediated by two different types of CCK receptor.

Journal

Journal of NeurochemistryWiley

Published: Mar 1, 1991

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