Postjunctional localization of substance P receptors on the rat portal vein.

Abstract:

:A dose-dependent contractile effect of substance P (SP) on the isolated, everted rat portal vein was competitively inhibited by two selective SP antagonists (pro2, phe7, trp9)-SP and (pro4, trp7,9)-SP 4-11. Phentolamine, atropine, methysergide, mepyramine, cimetidine, Sar1, Ile8-angiotensin II, Leu8, des-Arg9-bradykinin and indomethacin did not block the action of SP. However, some of these antagonists differentially reduced SP responses, but such inhibitory effects were shown to be nonspecific. The results suggest that the SP-induced contractions of the rat portal vein were directly mediated by specific receptors localized on the smooth muscle cells. In addition, the response to SP appeared to be independent of prostaglandin biosynthesis.

journal_name

Pharmacology

journal_title

Pharmacology

authors

Mastrangelo D,Mathison R,Huggel H

doi

10.1159/000137885

subject

Has Abstract

pub_date

1983-01-01 00:00:00

pages

305-18

issue

6

eissn

0031-7012

issn

1423-0313

journal_volume

27

pub_type

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