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Chronic angiotensin II AT1 receptor blockade increases cerebral cortical microvessel density. Am J Physiol Heart Circ Physiol 2006 Feb;290(2):H512-6 PMID: 16199473

Abstract

Angiotensin II is known to stimulate angiogenesis in the peripheral circulation through activation of the angiotensin II type 1 (AT1) receptor. This study investigated the effect of angiotensin receptor blockade on cerebral cortical microvessel density. Rats (6-7 wk old, n = 5-17) were instrumented with femoral arterial and venous indwelling catheters for arterial blood pressure measurement and drug administration. Rats were treated for 3 or 14 days with the AT1 receptor blocker losartan (50 mg/day in drinking water) or vehicle. Brains were sectioned and immunostained for CD31, and microvessel density was measured. Treatment with losartan for 3 or 14 days resulted in a slight decrease in mean arterial blood pressure (3 days, 92 +/- 1 mmHg; and 14 days, 99 +/- 2 mmHg) compared with vehicle (109 +/- 3 and 125 +/- 4 mmHg, respectively). A furosemide + captopril 14-day treatment group was added to control for the blood pressure change (96 +/- 3 mmHg). Microvessel density increased in groups treated with losartan for 14 days (429 +/- 13 vessels/mm2) compared with vehicle (383 +/- 11 vessels/mm2) but did not change with furosemide + captopril (364 +/- 7 vessels/mm2). Thus AT1 receptor blockade for 14 days resulted in increased cerebral microvessel density in a blood pressure-independent manner.

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 Type 1 Receptor Blockers
Animals
Antihypertensive Agents
Blood Pressure
Blood Vessels
Captopril
Cerebral Cortex
Diuretics
Drug Administration Schedule
Drug Combinations
Furosemide
Losartan
Male
Microcirculation
Rats
Rats, Sprague-Dawley
Time Factors



View this publication's entry at the Pubmed website PMID: 16199473
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