Endothelins and NADPH oxidases in the cardiovascular system.
1. The endothelin (ET) system and NADPH oxidase play important roles in the regulation of cardiovascular function, as well as in the pathogenesis of hypertension and other cardiovascular diseases. 2. Endothelins activate NADPH oxidases and thereby increase superoxide production, resulting in oxidative stress and cardiovascular dysfunction. Thus, NADPH oxidases may mediate the role of endothelins in some cardiovascular diseases. However, the role of reactive oxygen species (ROS) in mediating ET-induced vasoconstriction and cardiovascular disease remains under debate, as evidenced by conflicting reports from different research teams. Conversely, activation of NADPH oxidase can stimulate ET secretion via ROS generation, which further enhances the cardiovascular effects of NADPH oxidase. However, little is known about how ROS activate the endothelin system. It seems that the relationship between ET-1 and ROS may vary with cardiovascular disorders. 3. Endothelins activate NADPH oxidase via the ET receptor-proline-rich tyrosine kinase-2 (Pyk2)-Rac1 pathway. Rac1 is an important regulator of NADPH oxidase. There is ample evidence supporting direct stimulation by Rac1 of NADPH oxidase activity. In addition, Rac1-induced cardiomyocyte hypertrophy is mediated by the generation of ROS.
Department of Physiology, College of Medicine, University of Oklahoma Health Sciences Center, Oklahoma City, Oklahoma, USA.
Karigowda J
KJ
Dammanahalli
Zhongjie
Z
Sun
D000818:Animals; D002318:Cardiovascular Diseases / Q000201:enzymology / Q000378:metabolism* / Q000503:physiopathology; D002319:Cardiovascular System / Q000201:enzymology / Q000378:metabolism* / Q000503:physiopathology; D016232:Endothelins / Q000378:metabolism*; D051418:Focal Adhesion Kinase 2 / Q000378:metabolism; D006801:Humans; D019255:NADPH Oxidases / Q000378:metabolism*; D018384:Oxidative Stress; D017382:Reactive Oxygen Species / Q000378:metabolism; D017466:Receptors, Endothelin / Q000378:metabolism; D015398:Signal Transduction; D020830:rac1 GTP-Binding Protein / Q000378:metabolism
D016232:Endothelins; D017382:Reactive Oxygen Species; D017466:Receptors, Endothelin; D019255:NADPH Oxidases; D051418:Focal Adhesion Kinase 2; D020830:rac1 GTP-Binding Protein