Effects of nitric oxide and superoxide on relaxation in human artery and vein.

Abstract:

:Endothelium-derived relaxing and contracting factors play an important role in atherosclerosis, re-stenosis and graft survival. Internal thoracic artery (ITA) and saphenous vein (SV) are used as conduit vessels in coronary artery bypass graft surgery (CABG). The long-term graft patency rate is higher with ITA than SV. Effects of nitric oxide and superoxide on vascular relaxation in isolated rings of ITA and SV from patients undergoing CABG were investigated. NG-nitro-L-Argenine methylester (L-NAME) was used to block nitric oxide synthesis and superoxide dismutase (SOD) and tiron to scavenge superoxide. Responses to carbachol were taken as a measure of stimulated nitric oxide release and increased responses to phenylephrine after addition of L-NAME as a measure of basal nitric oxide release. Immunocytochemical demonstration of endothelial nitric oxide synthase was performed using anti-endothelial nitric oxide synthetase (anti-eNOS) NOS antibody. Stimulated nitric oxide release was observed in ITA and SV but basal release was reduced or absent in SV. Treatment with SOD and tiron potentiated carbachol stimulated relaxation in ITA and SV. Tiron treatment resulted in a significant increase in basal nitric oxide in veins. eNOS immunoreactivity was more intense in ITA than SV, compatible with reduced nitric oxide production in veins. This may contribute to the reduced patency of venous grafts.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Hamilton CA,Berg G,Mcintyre M,Mcphaden AR,Reid JL,Dominiczak AF

doi

10.1016/s0021-9150(97)00114-7

subject

Has Abstract

pub_date

1997-08-01 00:00:00

pages

77-86

issue

1

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(97)00114-7

journal_volume

133

pub_type

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