Journal
JOURNAL OF MOLECULAR NEUROSCIENCE
Volume 26, Issue 2-3, Pages 185-192Publisher
HUMANA PRESS INC
DOI: 10.1385/JMN:26:2-3:185
Keywords
angiotensin II; AT(1) receptor; bradykinin; B-2 receptor; G protein-coupled receptor; dimerization; spontaneously hypertensive rat; essential hypertension; kidney
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Angiotensin 11 plays a central role in the pathogenesis of hypertension and of related cardiovascular disorders by binding to and activating angiotensin 11 receptors (AT, receptors). Sensitization to the vasopressor response of angiotensin H is a key feature in many cardiovascular disorders. However, underlying mechanisms responsible for angiotensin II hypersensitivity are barely understood. Because angiotensin 11 responsiveness of AT(1) receptors can be specifically modified by AT(1)/B-2 receptor dimerization, we determined the AT(1) receptor dimerization status in an experimental model of hypertension. AT(1)/B-2 receptor heterodimers were abundant on renal mesangial cells isolated from spontaneously hypertensive rats compared with that on cells from normotensive controls. Heterodimerization of AT(1) with B-2 receptors was correlated with high levels of B, receptor protein on kidneys and on mesangial cells of hypertensive rats, as determined in immunoblot with receptor-specific antibodies. Specific inhibition of AT(1)/B-2 receptor heterodimers revealed that these receptor heterodimers mediated an enhanced angiotensin II-stimulated G alpha(q/11) activation and an increased endothelin-1 secretion of mesangial cells from hypertensive rats. Thus, AT(1)/B-2 receptor heterodimerization contributes to angiotensin 11 hyperresponsiveness of mesangial cells in experimental hypertension.
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