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Title: Role of angiotensin receptor subtypes in mesenteric vascular proliferation and hypertrophy.
Austin Authors: Cao, Zemin;Dean, Rachael G;Wu, L;Casley, David J;Cooper, Mark E
Affiliation: Department of Medicine, University of Melbourne, Austin & Repatriation Medical Centre (Repatriation Campus), Heidelberg West, Victoria, Australia
Issue Date: 1-Sep-1999
Publication information: Hypertension; 34(3): 408-14
Abstract: The aim of this study was to explore the regulation of angiotensin receptors after chronic infusion with angiotensin II (Ang II) and to clarify the relative roles of the angiotensin type 1 (AT(1)) and type 2 (AT(2)) receptors in the mediation of Ang II-induced mesenteric vascular hypertrophy. In male Sprague-Dawley rats, Ang II infusion at a dose of 58.3 ng/min by subcutaneous osmotic minipumps for 14 days led to increased mesenteric weight and wall:lumen ratio of the vessels and proliferation of smooth muscle cells. These vascular changes were attenuated by either valsartan, an AT(1) receptor antagonist, at a dose of 30 mg. kg(-1). d(-1) by gavage, or PD123319, an AT(2) receptor antagonist, at a dose of 830 ng/min by intraperitoneally implanted osmotic minipumps. Ang II infusion was associated with hypertension, which was prevented by valsartan, but not PD123319. (125)I-Sar(1), Ile(8) Ang II binding to mesenteric vasculature was increased after Ang II infusion. Valsartan treatment was associated with reduced Ang II binding to both receptor subtypes, whereas PD123319 was associated with reduced Ang II binding to only the AT(2) receptor subtype. These findings suggest that the trophic and proliferative effects of Ang II on the mesenteric vasculature are mediated by both AT(1) and AT(2) receptors.
Gov't Doc #: 10489386
Type: Journal Article
Subjects: Angiotensin II.pharmacology
Angiotensin Receptor Antagonists
Mesenteric Arteries.drug effects.metabolism.pathology.physiopathology
Proliferating Cell Nuclear Antigen.analysis.metabolism
Rats, Sprague-Dawley
Receptor, Angiotensin, Type 1
Receptor, Angiotensin, Type 2
Receptors, Angiotensin.physiology
Appears in Collections:Journal articles

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