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Opposing actions of angiotensin II on microvascular growth and arterial blood pressure. Hypertension 1996 Mar;27(3 Pt 2):760-5 PMID: 8613237

Abstract

We performed studies to further elucidate the mechanisms of angiotensin II (Ang II)-induced angiogenesis of the microvasculature. Rats were placed on a high salt diet (4% NaCl), and Ang II was infused at a subpressor rate (5 ng/kg per minute) for 3 days. Blood pressure was measured daily for 2 control and 3 infusion days. Microvessel density in the cremaster muscle was measured at the end of the infusion. Vessel density in rats that received subpressor Ang II infusion increased by 12.6% compared with rats that received vehicle infusion. When the angiotensin type 2 (AT2) receptor antagonist PD 123319 was coinfused with Ang II, blood pressure was elevated and vessel density increased above that observed with Ang II infusion alone (23% increase). When the AT1 receptor antagonist losartan was coinfused with Ang II, blood pressure was lower than control and vessel density was reduced compared with the Ang II group but was still greater than control (7.8% increase). In this study, Ang II stimulated angiogenesis in the rat cremaster muscle; this effect was enhanced by AT2 antagonism and inhibited by AT1 antagonism. Ang II infusion at a subpressor dose resulted in a pressor response with AT2 antagonism and a depressor response with AT1 antagonism. This suggests that in the microvasculature, the AT1 receptor mediates angiogenesis and vasoconstriction, and the AT2 receptor mediates an inhibition of angiogenesis and vasodilation.

Author List

Munzenmaier DH, Greene AS

Author

Andrew S. Greene PhD Interim Vice Chair, Chief, Professor in the Biomedical Engineering department at Medical College of Wisconsin

MESH terms used to index this publication - Major topics in bold

Angiotensin II
Animals
Blood Pressure
Infusions, Intravenous
Microcirculation
Muscle, Skeletal
Neovascularization, Physiologic
Rats
Receptors, Angiotensin



View this publication's entry at the Pubmed website PMID: 8613237
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