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Increased expression of angiotensin II type 2 receptors in the solitary-vagal complex blunts renovascular hypertension
Hypertension
  • Graziela Torres Blanch, São Paulo State University
  • André Henrique Freiria-Oliveira, São Paulo State University
  • Guilherme Fleury Speretta, São Paulo State University
  • Eduardo J Carrera, Nova Southeastern University
  • Hongwei Li, Southern Medical University
  • Robert C Speth, Nova Southeastern University
  • Eduardo Colombari, São Paulo State University
  • Colin Sumners, University of Florida
  • Débora S Colombari, São Paulo State University
Document Type
Article
Publication Date
10-1-2014
Keywords
  • angiotensin II,
  • angiotensin receptor blockers,
  • angiotensin-converting enzyme 2,
  • baroreflex
Abstract

Angiotensin II increases and decreases arterial pressure by acting at angiotensin type 1 and type 2 receptors, respectively. Renovascular hypertensive rats exhibit a high level of activity of the peripheral and central renin-angiotensin system. Therefore, in the present study, we evaluated the effect of increasing the expression of angiotensin type 2 receptors in the solitary-vagal complex (nucleus of the solitary tract/dorsal motor nucleus of the vagus), a key brain stem region for cardiovascular regulation, on the development of renovascular hypertension. Holtzman normotensive rats were implanted with a silver clip around the left renal artery to induce 2-kidney 1-clip renovascular hypertension. Three weeks later, rats were microinjected in the solitary-vagal complex with either an adenoassociated virus to increase the expression of angiotensin type 2 receptors or with a control vector. We observed that increasing angiotensin type 2 receptor expression in the solitary-vagal complex attenuated the development of renovascular hypertension and also reversed the impairment of the baroreflex and the increase in the low-frequency component of systolic blood pressure observed in renovascular hypertensive rats. Furthermore, an observed decrease in mRNA levels of angiotensin-converting enzyme 2 in the solitary-vagal complex of renovascular hypertensive rats was restored to control levels after viral-mediated increases in angiotensin type 2 receptors at this site. Collectively, these data demonstrate specific and beneficial effects of angiotensin type 2 receptors via the brain of hypertensive rats and suggest that central angiotensin type 2 receptors may be a potential target for therapeutics in renovascular hypertension.

ORCID ID

0000-0002-6434-2154

DOI
10.1161/HYPERTENSIONAHA.114.03188
Citation Information
Graziela Torres Blanch, André Henrique Freiria-Oliveira, Guilherme Fleury Speretta, Eduardo J Carrera, et al.. "Increased expression of angiotensin II type 2 receptors in the solitary-vagal complex blunts renovascular hypertension" Hypertension Vol. 64 Iss. 4 (2014) p. 777 - 83 ISSN: 0194-911X
Available at: http://works.bepress.com/robert-speth/123/