Myogenic Properties Of Brain And Cardiac Vessels And Their Relation To Disease.

Myogenic Properties Of Brain And Cardiac Vessels And Their Relation To Disease. Curr Vasc Pharmacol. 2013 Sep 25; Authors: Izzard AS, Heagerty AM Abstract Intrinsic arterial myogenic function comprises the degree of constriction (myogenic tone), the arterial constriction to an increase in intraluminal pressure and vice versa (myogenic response), and forced dilation at high intraluminal pressure. Although the development of myogenic tone at 40-60 mmHg involves the influx of calcium (Ca2+) through voltage-dependent Ca2+ channels and an elevation in arterial intracellular Ca2+ (Ca2+i), myogenic responses between 60-140 mmHg involves predominantly Rho kinase (ROK)-mediated changes in Ca2+ sensitivity. In the cerebral circulation an impaired myogenic response results in impaired cerebral autoregulation and susceptibility hypertension-induced cerebral haemorrhage. An impaired cerebral artery myogenic response, due to blunted ROK mediated changes in Ca2+ sensitivity, may be a consequence of defective mechanotransduction of the intraluminal pressure stimulus; this may be a result of abnormalities in the extracellular matrix. In the coronary circulation distinctions between the mechanisms involved in the development of myogenic tone and the myogenic response have not been clearly defined. However, coronary artery myogenic tone is dependent on both Ca2+ entry through voltage -dependent Ca2+ channels and protein kinase C (PKC) activity. Impaired coronary...
Source: Current Vascular Pharmacology - Category: Drugs & Pharmacology Authors: Tags: Curr Vasc Pharmacol Source Type: research