A Study of the H2-receptor for Histamine Stimulating Adenylate Cyclase in Homogenates of Guinea-pig Lung Parenchyma

Overview

Journal Br J Pharmacol

Publisher Wiley

Specialty Pharmacology

Date 1986 Jan 1

PMID 2869813

Citations 4

Authors

J C Foreman

D B Norris

T J Rising

S E Webber

Affiliations

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Abstract

The effect of forskolin and several H2-agonists was investigated on the activity of adenylate cyclase in homogenates of guinea-pig lung parenchyma. Histamine, 0.1 microM to 1 mM, dimaprit, 1 microM to 10 mM, 4-methyl histamine, 0.1 microM to 10 mM, impromidine, 10 nM to 10 microM and forskolin, 1 nM to 100 microM, all produced a dose-dependent stimulation of adenylate cyclase activity above the basal level. The histamine H1-receptor antagonist mepyramine, 10 microM, and beta-adrenoceptor antagonist propranolol, 10 microM, had no effect on the stimulation by histamine of adenylate cyclase. The dose-response curve for stimulation by histamine of adenylate cyclase was shifted to the right in a dose-dependent manner by increasing concentrations of several H2-antagonists. Schild plots constructed for each H2-antagonist produced straight lines with slopes not significantly different from unity. The equilibrium dissociation constants obtained for the H2-antagonists in this study were similar to those previously reported for inhibition of dimaprit-induced relaxation of the pre-contracted lung strip, inhibition of [3H]-tiotidine binding to homogenates of guinea-pig lung parenchyma and inhibition of histamine-stimulated adenylate cyclase in guinea-pig gastric mucosa.

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