IUBMB Life. 2005 Sep;57(9):603-6.

Hydrogen sulfide as a vasodilator.

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Department of Pharmacology, Faculty of Medicine, National University of Singapore, Singapore. mbhatia@nus.edu.sg

Abstract

Gases such as nitric oxide (NO) and carbon monoxide (CO) play important roles both in normal physiology and in disease. The toxic effects of hydrogen sulphide (H2S) on living organisms have been recognized for nearly 300 years. In recent years, however, interest has been directed towards H2S as the third gaseous mediator, which has been shown to exhibit potent vasodilator activity both in vitro and in vivo most probably by opening vascular smooth muscle K(ATP) channels. Of the two enzymes, cystathionine-gamma-lyase (CSE) and cystathionine-beta-synthetase (CBS), which utilize L-cysteine as substrate to form H2S, CSE is believed to be the key enzyme which forms H2S in the cardiovascular system. Recent studies have shown an important role of the vasodilator action of H2S in health and disease.

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