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- W2016176503 abstract "We have examined whether expression of angiotensin II (Ang II) type 1 (AT<sub>1</sub>) and/or type 2 (AT<sub>2</sub>) receptors are changed in thoracic aorta under pressure-overload by abdominal aortic banding in rats and determined whether their changes are accompanied by alteration in contractile response of thoracic aorta to Ang II. AT<sub>2</sub> receptor mRNA levels determined by reverse transcription-polymerase chain reaction or quantitative real-time polymerase chain reaction were increased by about 300% in aortas 4, 7, 14, and 28 days after banding without changes in AT<sub>1</sub> receptor mRNA levels. Contractile response of aortic rings to Ang II was decreased in thoracic aortas 7 days after banding, and AT<sub>2</sub> receptor antagonist PD123319 (1-[[4-(dimethulamino)-3-methylphenyl]methyl]-5-(diphenylacetyl)-4,5,6,7-tetrahydro-1<i>H</i>-imidazo[4,5-<i>c</i>]pyridine-6-carboxylic acid ditrifluoroacetate) (10<sup>–6</sup> M) increased the Ang II responsiveness in pressure-loaded but not in sham rings. After removal of the endothelium or treatment with <i>N</i><sup>G</sup>-nitro-l-arginine methyl ester (l-NAME), no differences were observed in Ang II responsiveness between sham and pressure-loaded rings. Either losartan (1 mg/kg/day i.p.) or candesartan (2 mg/kg/day p.o.) for 7 days after banding not only abolished the up-regulation of AT<sub>2</sub> receptor mRNA in aortas but also recovered their Ang II responsiveness. Basal cGMP levels were 2 times higher in pressure-loaded than in sham rings; both levels were not affected by Ang II (10<sup>–7</sup> M; 5 min), but greatly decreased by l-NAME (10<sup>–4</sup> M, 30 min). These results suggest that pressure-overload induces the up-regulation of AT<sub>2</sub> receptor expression in aortas via AT<sub>1</sub> receptor and thereby negatively modulates the vasoconstrictor sensitivity to Ang II, probably mediated by the mechanisms independent of the nitric oxide-cGMP system." @default.
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- W2016176503 date "2003-11-10" @default.
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- W2016176503 title "Up-Regulation of Angiotensin II Type 2 Receptor in Rat Thoracic Aorta by Pressure-Overload" @default.
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- W2016176503 doi "https://doi.org/10.1124/jpet.103.058420" @default.
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