PMID: 16514169Mar 4, 2006Paper

Hydrogen peroxide as a paracrine vascular mediator: regulation and signaling leading to dysfunction

Experimental Biology and Medicine
Noelia Ardanaz, P J Pagano

Abstract

Numerous studies have demonstrated the ability of a variety of vascular cells, including endothelial cells, smooth muscle cells, and fibroblasts, to produce reactive oxygen species (ROS). Until recently, major emphasis was placed on the production of superoxide anion (O(2)(-)) in the vasculature as a result of its ability to directly attenuate the biological activity of endothelium-derived nitric oxide (NO). The short half-life and radius of diffusion of O(2)(-) drastically limit the role of this ROS as an important paracrine hormone in vascular biology. On the contrary, in recent years, the O(2)(-) metabolite hydrogen peroxide (H(2)O(2)) has increasingly been viewed as an important cellular signaling agent in its own right, capable of modulating both contractile and growth-promoting pathways with more far-reaching effects. In this review, we will assess the vascular production of H(2)O(2), its regulation by endogenous scavenger systems, and its ability to activate a variety of vascular signaling pathways, thereby leading to vascular contraction and growth. This discussion will include the ability of H(2)O(2) to (i) initiate calcium flux as well as (ii) stimulate pathways leading to sensitization of contractile elements to calc...Continue Reading

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