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Am J Pathol. 2011 Jan;178(1):434-41. doi: 10.1016/j.ajpath.2010.11.034. Epub 2010 Dec 23.

Natural regulatory T cells control coronary arteriolar endothelial dysfunction in hypertensive mice.

Author information

  • 1Department of Physiology, Hypertension and Renal Center of Excellence, Tulane University, New Orleans, Louisiana 70112, USA. kmatroug@tulane.edu

Erratum in

  • Am J Pathol. 2011 Mar;178(3):1406. Zakaria, Abd Elmageed [corrected to Abd Elmageed, Zakaria].

Abstract

Coronary artery disease in patients with hypertension is increasing worldwide and leads to severe cardiovascular complications. The cellular and molecular mechanisms that underlie this pathologic condition are not well understood. Experimental and clinical research indicates that immune cells and inflammation play a central role in the pathogenesis of cardiovascular diseases. Recently, it has been reported that CD4(+)CD25(+) regulatory T cells (Tregs) regulate heart fibrosis in hypertension. In this study, we determined the role of Tregs in coronary arteriolar endothelial dysfunction in angiotensin II-dependent hypertensive mice. Mice infused with angiotensin II had significantly increased blood pressure, as determined using telemetry, and apoptotic Treg numbers, as measured using flow cytometry. The mice displayed inflammation, assessed by macrophage activation/infiltration into coronary arterioles and the heart, and increased local tumor necrosis factor-α release, which participates in reduced coronary arteriolar endothelial-dependent relaxation in response to acetylcholine using an arteriograph. Hypertensive mice injected with Tregs isolated from control mice had significantly reduced macrophage activation and infiltration, reduced tumor necrosis factor-α release, and improved coronary arteriolar endothelium-dependent relaxation. Our novel data indicate that Tregs are important in the development of coronary arteriolar endothelial dysfunction in hypertension. These results suggest a new direction in the investigation of vascular disease in hypertension and could lead to a therapeutic strategy that involves immune system modulation using Tregs.

Copyright © 2011 American Society for Investigative Pathology. Published by Elsevier Inc. All rights reserved.

PMID:
21224080
[PubMed - indexed for MEDLINE]
PMCID:
PMC3069876
Free PMC Article
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