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- W2495600458 abstract "Rho kinase (ROCK) has been implicated in physiological and pathophysiological processes, including regulation of vascular function. ROCK signaling is thought to be a critical contributor to cardiovascular disease, including hypertension and effects of angiotensin II (Ang II). Two isoforms of ROCK (1 and 2) have been identified and are expressed in vascular cells. In this study, we examined the importance of ROCK2 in relation to vessel function using several models and a novel inhibitor of ROCK2. First, incubation of carotid arteries with the direct RhoA activator CN-03 or Ang II impaired endothelium-dependent relaxation by ≈40% to 50% ( P <0.05) without altering endothelium-independent relaxation. Both CN-03- and Ang II–induced endothelial dysfunction was prevented by Y-27632 (an inhibitor of both ROCK isoforms) or the selective ROCK2 inhibitor SLX-2119. In contrast, SLX-2119 had little effect on contraction of carotid arteries to receptor-mediated agonists (serotonin, phenylephrine, vasopressin, or U46619). Second, in basilar arteries, SLX-2119 inhibited constriction to Ang II by ≈90% without significantly affecting responses to serotonin or KCl. Third, in isolated pressurized brain parenchymal arterioles, SLX-2119 inhibited myogenic tone in a concentration-dependent manner (eg, 1 μmol/L SLX-2119 dilated by 79±4%). Finally, SLX-2119 dilated small pial arterioles in vivo, an effect that was augmented by inhibition of nitric oxide synthase. These findings suggest that ROCK2 has major, but heterogeneous, effects on function of endothelium and vascular muscle. The data support the concept that aberrant ROCK2 signaling may be a key contributor to select aspects of large and small vessel disease, including Ang II–induced endothelial dysfunction." @default.
- W2495600458 created "2016-08-23" @default.
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- W2495600458 date "2016-09-01" @default.
- W2495600458 modified "2023-10-16" @default.
- W2495600458 title "Heterogeneous Impact of ROCK2 on Carotid and Cerebrovascular Function" @default.
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- W2495600458 doi "https://doi.org/10.1161/hypertensionaha.116.07430" @default.
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