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Effect of a decrease in pH on responses mediated by P2 receptors in the rat mesenteric arterial bed.

Abstract：

:The present study investigated the effect of acidosis (reduction in pH of the Krebs' solution from 7.4 to 6.9) on responses to vasoconstrictors and vasodilators, with a focus on purines, in the rat isolated perfused mesenteric arterial bed. alpha,beta-Methylene ATP (alpha,beta-meATP) (10 microM), a selective P2X receptor agonist, elicited a desensitizing vasocontraction, which was not significantly affected by a reduction in pH to 6.9. Contractions to ATP were also not significantly different at pH 6.9 compared to pH 7.4. In contrast, contractile responses to noradrenaline, methoxamine, and vasopressin were greatly attenuated at pH 6.9 (by 48-83%; P<0.01). At raised tone, vasorelaxations to ADP at P2Y receptors, and to calcitonin gene-related peptide (CGRP), were not different at pH 7.4 and pH 6.9. These data indicate that a reduction in pH (to 6.9) differentially affects responses to vasoconstrictors in the rat mesenteric arterial bed. There is no effect on contractions mediated via P2X receptors, but contractions to noradrenaline, methoxamine and vasopressin are greatly attenuated.

journal_name

Eur J Pharmacol

journal_title

European journal of pharmacology

authors

Ralevic V

doi

10.1016/s0014-2999(00)00631-2

keywords:

subject

Has Abstract

pub_date

2000-10-06 00:00:00

pages

99-107

issue

1

eissn

0014-2999

issn

1879-0712

pii

S0014-2999(00)00631-2

journal_volume

406

pub_type

杂志文章

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