JPET Introducing ALZET?ew Model 2006 Pump

Home Help [Feedback] [For Subscribers] [Archive] [Search] [Contents]
QUICK SEARCH:   [advanced]


     

This Article
Right arrow Full Text (PDF)
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Goudreau, J. L.
Right arrow Articles by Moore, K. E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Goudreau, J. L.
Right arrow Articles by Moore, K. E.

5-Hydroxytryptamine2 receptor-mediated regulation of periventricular- hypophysial dopaminergic neuronal activity and the secretion of alpha- melanocyte-stimulating hormone

JL Goudreau, KJ Lookingland and KE Moore

Department of Pharmacology and Toxicology, Michigan State University, East Lansing.

The present study examined the effects of the 5-hydroxytryptaminergic (5HT)2/1c agonist 1-(2,5-dimethoxy-4-iodophenyl)-2-aminopropane (DOI) on periventricular-hypophysial dopaminergic (DA) neuronal activity and the secretion of alpha-melanocyte-stimulating hormone (alpha MSH). For comparison, the effects of DOI on tuberoinfundibular DA neuronal activity and the secretion of prolactin were also examined. Periventricular hypophysial and tuberoinfundibular DA neuronal activities were estimated by measuring the concentrations of 3,4- dihydroxyphenylacetic acid (DOPAC) in the terminal regions of these neurons; i.e., in the intermediate lobe of the pituitary and median eminence, respectively. Acute administration of DOI produced dose- and time-related decreases in intermediate lobe DOPAC concentrations and corresponding increases in plasma alpha MSH concentrations. Pretreatment of animals with either the 5HT2/1c antagonist ritanserin or the selective 5HT2 antagonist alpha-phenyl-1-(2-phenylethyl)-4- piperidine methanol (MDL-11,939) blocked the DOI-induced decrease in intermediate lobe DOPAC concentrations and increase in plasma alpha MSH concentrations. Acute administration of DOI produced dose- and time- related increases in plasma prolactin concentrations but did not alter DOPAC concentrations in the median eminence. Furthermore, the DOI- induced increase in plasma prolactin concentrations was blocked by ritanserin, but not MDL-11,939 pretreatment. Taken together, these data suggest that DOI inhibits periventricular hypophysial DA neuronal activity and increases the secretion of alpha MSH by activating 5HT2 receptors, whereas the DOI-induced prolactin secretion is independent of a decrease in tuberoinfundibular DA neuronal activity and is most likely mediated by 5HT2/1c receptor activation.

Volume 268, Issue 1, pp. 175-179, 01/01/1994
Copyright © 1994 by American Society for Pharmacology and Experimental Therapeutics




This article has been cited by other articles:


Home page
 Physiol. Rev.Home page
M. E. Freeman, B. Kanyicska, A. Lerant, and G. Nagy
Prolactin: Structure, Function, and Regulation of Secretion
Physiol Rev, October 1, 2000; 80(4): 1523 - 1631.
[Abstract] [Full Text] [PDF]

Home page
 J. Exp. Biol.Home page
E Hoglund, P. Balm, and S Winberg
Skin darkening, a potential social signal in subordinate arctic charr (Salvelinus alpinus): the regulatory role of brain monoamines and pro-opiomelanocortin-derived peptides
J. Exp. Biol., January 6, 2000; 203(11): 1711 - 1721.
[Abstract] [PDF]


Home Help [Feedback] [For Subscribers] [Archive] [Search] [Contents]
All ASPET Journals Molecular Pharmacology Pharmacological Reviews
Molecular Interventions Drug Metabolism and Disposition

Copyright © 1994 by the American Society for Pharmacology and Experimental Therapeutics.