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Increased Expression of Angiotensin II Type 2 Receptors in the Solitary-Vagal Complex Blunts Renovascular Hypertension
  • Universidade Estadual Paulista (UNESP)
  • Nova SE Univ
  • Southern Med Univ
  • Univ Florida
  • Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
  • Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
  • Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
  • National Institutes of Health
Sponsorship Process Number: 
  • CNPq: 304918/2011-3
  • CNPq: 473108/2011-9
  • FAPESP: 11/50770-1
  • FAPESP: 13/50121-9
  • CAPES: PNPD/CAPES 2748/2010
  • National Institutes of HealthR01 HL076803
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.
Issue Date: 
Hypertension. Philadelphia: Lippincott Williams & Wilkins, v. 64, n. 4, p. 777-+, 2014.
Time Duration: 
Lippincott Williams & Wilkins
  • angiotensin II
  • angiotensin-converting enzyme 2
  • angiotensin receptor blockers
  • baroreflex
Access Rights: 
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Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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