Vascular type 1 angiotensin receptors control blood pressure by augmenting peripheral vascular resistance in female mice.

Published

Journal Article

Angiotensin II (ANG II) is a major mediator of hypertension pathogenesis. In addition, there are well-documented differences in expression of the renin-angiotensin system (RAS) components and ANG II responses between males and females, which may explain sex differences in blood pressure (BP) and hypertension epidemiology. We previously showed that type 1A angiotensin (AT1A) receptors in vascular smooth muscle cells (VSMCs) play a critical role in BP regulation and hypertension pathogenesis, but these studies were carried out in male mice. Therefore, the major goal of the current studies was to examine the impact of VSMC AT1A receptors on BP and hypertension pathogenesis in female mice. We found that elimination of VSMC AT1A receptors in female mice reduced (≈8 mmHg) baseline BP without altering sodium sensitivity. The severity of ANG II-induced hypertension was diminished (≈33% reduction in BP), particularly during the last 2 wk of chronic ANG II infusion, compared with controls, but natriuresis was not altered during the first 5 days of ANG II infusion. Urinary norepinephrine levels were enhanced in female SMKO compared with control mice. There was a virtually complete elimination of ANG II-induced kidney hemodynamic responses with attenuation of acute vasoconstrictor responses in the systemic vasculature. These findings demonstrate that direct vascular actions of AT1A receptors play a prominent role in BP control and hypertension pathogenesis in female mice.

Full Text

Duke Authors

Cited Authors

  • Wolf, E; Diaz, EJ; Hollis, AN; Hoang, TA; Azad, HA; Bendt, KM; Griffiths, RC; Sparks, MA

Published Date

  • October 1, 2018

Published In

Volume / Issue

  • 315 / 4

Start / End Page

  • F997 - F1005

PubMed ID

  • 29897266

Pubmed Central ID

  • 29897266

Electronic International Standard Serial Number (EISSN)

  • 1522-1466

Digital Object Identifier (DOI)

  • 10.1152/ajprenal.00639.2017

Language

  • eng

Conference Location

  • United States