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Abstract

Functional studies of nonpeptide angiotensin II receptor subtype-specific ligands: DuP 753 (AII-1) and PD123177 (AII-2).

P C Wong, S D Hart, A M Zaspel, A T Chiu, R J Ardecky, R D Smith and P B Timmermans
Journal of Pharmacology and Experimental Therapeutics November 1990, 255 (2) 584-592;
P C Wong
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S D Hart
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A M Zaspel
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A T Chiu
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R J Ardecky
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R D Smith
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P B Timmermans
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Abstract

DuP 753 and PD123177 are two nonpeptide angiotensin II (AII)-specific ligands, which show high affinities for two respective and distinct subtypes of AII binding sites, i.e., AII-1 and AII-2 sites, respectively, in the rat adrenal gland, brain and uterus. The objective of this study is to identify the functions of these subtype binding sites in the adrenal, sympathetic ganglia, brain and vascular smooth muscle. In conscious rats, DuP 753 at 1, 3 and 10 mg/kg i.v. but not PD123177 at 30 and 100 mg/kg i.v. inhibited the AII-induced aldosterone increase. In the isolated perfused rat adrenal gland, DuP 753 at 10(-6) and 10(-4) M but not PD123177 at 10(-3) M blocked the AII-induced epinephrine secretion. In control and chemically sympathectomized pithed rats, the pressor and tachycardiac responses to AII were blocked by DuP 753 at 10 mg/kg i.v. but not by PD123177 at 100 mg/kg i.v. In conscious rats, DuP 753 at 10 mg/kg s.c. but not PD123177 at 100 mg/kg s.c. inhibited the AII-induced water drinking. In the rabbit aorta, DuP 753 at 10(-6) M but not PD123177 at 10(-4) M inhibited the contractile effect of AII. In conscious renal artery-ligated hypertensive rats, DuP 753 but not PD123177 at 0.1 to 10 mg/kg i.v. lowered blood pressure. In summary, a function of the PD123177-sensitive AII binding site (AII-2) has not yet been identified. However, the DuP 753-sensitive site (AII-1) appears to mediate the AII-induced responses such as adrenal aldosterone and catecholamine secretion, release of catecholamine from sympathetic ganglia, drinking and vasoconstriction.

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Journal of Pharmacology and Experimental Therapeutics
Vol. 255, Issue 2
1 Nov 1990
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Abstract

Functional studies of nonpeptide angiotensin II receptor subtype-specific ligands: DuP 753 (AII-1) and PD123177 (AII-2).

P C Wong, S D Hart, A M Zaspel, A T Chiu, R J Ardecky, R D Smith and P B Timmermans
Journal of Pharmacology and Experimental Therapeutics November 1, 1990, 255 (2) 584-592;

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Abstract

Functional studies of nonpeptide angiotensin II receptor subtype-specific ligands: DuP 753 (AII-1) and PD123177 (AII-2).

P C Wong, S D Hart, A M Zaspel, A T Chiu, R J Ardecky, R D Smith and P B Timmermans
Journal of Pharmacology and Experimental Therapeutics November 1, 1990, 255 (2) 584-592;
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