Regulation of nitric oxide production in human coronary microvessels and the contribution of local kinin formation

Circulation
M R KichukT H Hintze

Abstract

The goal of this study was to define the regulation of nitric oxide release by coronary microvessels from the failing and nonfailing human heart and to determine the role of local kinin production in the elaboration of nitric oxide by human coronary microvascular endothelium. Ten hearts from humans with end-stage heart failure and two hearts from patients without heart failure were harvested at the time of orthotopic cardiac transplantation. Microvessels were sieved and the production of nitrite was determined by the Griess reaction. Microvessels were incubated in the presence of agonists for nitric oxide production (acetylcholine and bradykinin), which caused dose-dependent increases in nitrite, a response that was blocked by NG-nitro-L-arginine methyl ester and receptor-specific antagonists (atropine and HOE 140, respectively). In addition, the production of nitrite by microvessels from the failing heart appeared to be less than that produced by microvessels from the nonfailing heart. Incubation with norepinephrine or the alpha2-adrenergic agonist BHT 920 also caused dose-dependent increases in nitrite production, which were blocked by the B2-receptor antagonist HOE 140. This implicated local kinin synthesis as an intermediat...Continue Reading

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