Hydrogen sulfide and nitric oxide are mutually dependent in the regulation of angiogenesis and endothelium-dependent vasorelaxation.

Proceedings of the National Academy of Sciences of the United States of America
Ciro ColettaCsaba Szabó

Abstract

Hydrogen sulfide (H(2)S) is a unique gasotransmitter, with regulatory roles in the cardiovascular, nervous, and immune systems. Some of the vascular actions of H(2)S (stimulation of angiogenesis, relaxation of vascular smooth muscle) resemble those of nitric oxide (NO). Although it was generally assumed that H(2)S and NO exert their effects via separate pathways, the results of the current study show that H(2)S and NO are mutually required to elicit angiogenesis and vasodilatation. Exposure of endothelial cells to H(2)S increases intracellular cyclic guanosine 5'-monophosphate (cGMP) in a NO-dependent manner, and activated protein kinase G (PKG) and its downstream effector, the vasodilator-stimulated phosphoprotein (VASP). Inhibition of endothelial isoform of NO synthase (eNOS) or PKG-I abolishes the H(2)S-stimulated angiogenic response, and attenuated H(2)S-stimulated vasorelaxation, demonstrating the requirement of NO in vascular H(2)S signaling. Conversely, silencing of the H(2)S-producing enzyme cystathionine-γ-lyase abolishes NO-stimulated cGMP accumulation and angiogenesis and attenuates the acetylcholine-induced vasorelaxation, indicating a partial requirement of H(2)S in the vascular activity of NO. The actions of H(2)S...Continue Reading

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