Presence of Hormonally-Sensitive Adenylate Cyclase Receptors in Capillary-Enriched Fractions from Rat Cerebral Cortex

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Abstract

The 10 000 g particulate fraction from capillary-enriched fractions isolated from rat cerebral cortex was shown to possess an adenylate cyclase highly sensitive to activation by sodium fluoride, norepinephrine, epinephrine, isoproterenol and dopamine. To a lesser extent histamine and three dopamine agonists, namely M-7 (5, 6-dihydroxy-2-dimethylamino tetralin), ET-495 (methane sulfonate of pyribedil), and S-584 (metabolite of pyribedil) stimulated the enzyme preparation. The action of norepinephrine was blocked by propranolol while phenotolamine and haloperidol were relatively ineffective except at highest concentrations. Phentolamine and propranolol at only highest concentrations (10<sup>–4</sup> m) antagonized the action of dopamine. Haloperidol was seen to be a potent inhibitor of either dopamine- or dopamine agonist-sensitive adenylate cyclase. No effects on the enzyme were observed with methoxamine, octopamine or serotonin. These preliminary data suggest the presence of a mixed population of receptors for adenylate cyclase in rat brain capillaries.

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Author and article information

Journal

Journal ID (publisher-id): JVR

Journal ID (nlm-ta): J Vasc Res

Journal ID (doi): 10.1159/issn.1018-1172

Title: Journal of Vascular Research

Publisher: S. Karger AG

ISSN (Print): 1018-1172

ISSN (Electronic): 1423-0135

Publication date Subscription-year: 1978

Publication date (Print): 1978

Publication date (Electronic): 18 September 2008

Volume: 15

Issue: 5

Pages: 286-298

Affiliations

Department of Pharmacology, University of South Alabama, College of Medicine, Mobile, Ala. and Department of Pharmacology, School of Medicine, University of New Mexico, Albuquerque, N.Mex.

Article

Publisher ID: 158174 Other ID: Blood Vessels 1978;15:286–298

DOI: 10.1159/000158174

SO-VID: 13bebb42-6964-4d96-8cb3-93c91bce5429

License:

Copyright: All rights reserved. No part of this publication may be translated into other languages, reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying, recording, microcopying, or by any information storage and retrieval system, without permission in writing from the publisher. Drug Dosage: The authors and the publisher have exerted every effort to ensure that drug selection and dosage set forth in this text are in accord with current recommendations and practice at the time of publication. However, in view of ongoing research, changes in government regulations, and the constant flow of information relating to drug therapy and drug reactions, the reader is urged to check the package insert for each drug for any changes in indications and dosage and for added warnings and precautions. This is particularly important when the recommended agent is a new and/or infrequently employed drug. Disclaimer: The statements, opinions and data contained in this publication are solely those of the individual authors and contributors and not of the publishers and the editor(s). The appearance of advertisements or/and product references in the publication is not a warranty, endorsement, or approval of the products or services advertised or of their effectiveness, quality or safety. The publisher and the editor(s) disclaim responsibility for any injury to persons or property resulting from any ideas, methods, instructions or products referred to in the content or advertisements.

History

Date received : 30 September 1976

Date accepted : 31 August 1977

Page count

Pages: 13

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