Possible existence of novel endothelium-derived relaxing factor in the endothelium of rat mesenteric arterial bed.

Abstract:

:Both acetylcholine (ACh) and cyclopiazonic acid (CPA) caused vasodilation of the mesenteric arterial bed in a concentration-dependent manner. When the mesenteric arterial bed was perfused with 0.1% Triton X-100 for 30 s, ACh- or CPA-induced vasodilation was almost abolished. ACh-induced vasodilation was significantly attenuated in isotonic high K+ (60 mM) solution and significantly decreased by treatment with methylene blue (MB) with NG-nitro-L-arginine (L-NNA) in isotonic high K+ (60 mM) solution, whereas CPA-induced vasodilation of the mesentery was not affected by these treatments. ACh- or CPA-induced vasodilation was not affected by indomethacin. ACh caused significant increase in cyclic GMP levels and cyclic AMP in effluents from the perfused mesentery, whereas CPA could not increase cyclic GMP. CPA caused significant increase in cyclic AMP in a concentration-dependent manner, and CPA-induced increase in cyclic AMP was completely inhibited by removal of the endothelium. These results suggest that one or more endothelium-derived relaxing factor (EDRF) or factors should exist other than endothelium-derived nitric oxide (EDNO) or endothelium-derived hyperpolarizing factor (EDHF) in the endothelium of the rat mesenteric arterial bed. The novel EDRF may relax the mesenteric arterial bed through production of cyclic AMP but not cyclic GMP.

journal_name

J Cardiovasc Pharmacol

authors

Kamata K,Umeda F,Kasuya Y

doi

10.1097/00005344-199604000-00022

subject

Has Abstract

pub_date

1996-04-01 00:00:00

pages

601-6

issue

4

eissn

0160-2446

issn

1533-4023

journal_volume

27

pub_type

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