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 Yamaguchi, I.
Right arrow Articles by Kumada, S.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Yamaguchi, I.
Right arrow Articles by Kumada, S.

Central and peripheral adrenergic mechanisms regulating gastric secretion in the rat

I Yamaguchi, J Hiroi and S Kumada

Subcutaneous injection of sympathomimetic agents reduced gastric secretion in pylorus-ligated rats, and the decreasing order of activity was: isoproterenol, norepinephrine, naphazoline and phenylephrine. The effect of naphazoline and phenylephrine was antagonized with 4 mg/kg s.c. of phentolamine, and that of isoproterenol with 4 mg/kg s.c. of propranolol. Thus there exist separate, alpha and beta adrenergic receptors which control gastric secretion in the rat. Intracerebroventricular (i.c.v.) injection of the sympathomimetic agents also reduced secretion, naphazoline being the most potent. The ED50 of i.c.v. naphazoline was 12.3 times less than that of s.c. dose. The antisecretory effect of i.c.v. naphazoline was antagonized with i.c.v. phentolamine (0.016 and 0.064 mg/kg), but not with propranolol. These results suggest that naphazoline stimulates central alpha adrenergic receptors which has a tonic inhibiting role in rat gastric secretion. Analogous to the results with naphazoline, i.c.v. phentolamine, but not propranolol, blocked an antisecretory effect of chlorpromazine. Phentolamine administered s.c. also reduced the antisecretory activity, but the dose required for the antagonism was 250 times that of i.c.v. phentolamine. An antisecretory effect of imipramine was not blocked by phentolamine or propranolol. These results suggest that an activation of central alpha adrenergic receptors is important for the antisecretory effect of chlorpromazine.

Volume 203, Issue 1, pp. 125-131, 10/01/1977
Copyright © 1977 by American Society for Pharmacology and Experimental Therapeutics




This article has been cited by other articles:


Home page
 Am. J. Physiol. Gastrointest. Liver Physiol.Home page
M. S. Mondal, Y. Date, N. Murakami, K. Toshinai, T. Shimbara, K. Kangawa, and M. Nakazato
Neuromedin U acts in the central nervous system to inhibit gastric acid secretion via CRH system
Am J Physiol Gastrointest Liver Physiol, June 1, 2003; 284(6): G963 - G969.
[Abstract] [Full Text] [PDF]


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

Copyright © 1977 by the American Society for Pharmacology and Experimental Therapeutics.