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• W2032171017 abstract "Vasoconstrictive, proliferative and oxidative effects of angiotensin II (Ang II) are mediated by Ang II type 1 (AT1) receptors. The effects of Ang II via the Ang II type 2 (AT2) receptor subtype (AT2R) are less well defined. Growing evidence shows the existence of cross-talk between the Ang II receptor subtypes, which is revealed by AT1R blockade. Hence, under certain conditions, AT2R may act as an antagonistic system with respect to the AT1R.The present study was designed to investigate the effects of long-term treatment with the AT1R antagonist losartan on the AT2R-mediated response to Ang II in thoracic aortas isolated from spontaneously hypertensive rats (SHR) and Wistar-Kyoto (WKY) rats. Untreated animals from both groups were used as controls. The mRNA expression of AT1R and AT2R was measured by reverse transcription-polymerase chain reaction.During contraction in response to norepinephrine, Ang II induced concentration-dependent relaxation only in aortas isolated from SHR chronically treated with losartan (8 weeks; 30 mg/kg/day in drinking water). These relaxations were inhibited by the selective AT2R blocker PD123319, N(G)-nitro-L-arginine methyl ester (L-NAME), and B2receptor antagonist HOE-140. Accordingly, nitric oxide (NO) production was increased by Ang II only in the aortas of treated SHR. After AT1R blockade, AT2R mRNA was significantly increased. These findings demonstrate that, in hypertensive rats, chronic AT1R blockade is associated with an inverted vasomotor response to Ang II via AT2R-mediated NO production.The losartan-unmasked AT2R-vasorelaxation could significantly contribute to the beneficial hemodynamic effects of AT1R blockade. In view of this, our study highlights the importance of the integrated Ang II receptor network, which may help to define further the mechanisms of the well-established vascular protective effects of AT1R blockers." @default.
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• W2032171017 date "2005-04-01" @default.
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• W2032171017 title "Angiotensin II type 2 receptors contribute to vascular responses in spontaneously hypertensive rats treated with angiotensin II type 1 receptor antagonists" @default.
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• W2032171017 doi "https://doi.org/10.1016/j.amjhyper.2004.11.007" @default.
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