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Exercise-Induced Modulation of Angiotensin II Responses in Femoral Veins From 2-Kidney-1-Clip Hypertensive Rats

Authors
  • Chies, Agnaldo Bruno1
  • Spadella, Maria Angélica2
  • de Oliveira, Priscila Ramos1
  • Domeniconi, Raquel Fantin3
  • de Mello Santos, Talita3
  • Moreira, Roseli Peres4
  • Rosales, Carla B.5
  • Casarini, Dulce Elena4
  • Navar, Luis Gabriel5
  • 1 Laboratory of Pharmacology, Marília Medical School, Marília , (Brazil)
  • 2 Human Embryology Laboratory, Marília Medical School, Marília , (Brazil)
  • 3 Department of Anatomy, Institute of Biociences, UNESP, Botucatu , (Brazil)
  • 4 Department of Medicine, Nephrology Division, Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo , (Brazil)
  • 5 Department of Physiology and Hypertension and Renal Center of Excellence, Tulane University School of Medicine, New Orleans, LA , (United States)
Type
Published Article
Journal
Frontiers in Physiology
Publisher
Frontiers Media SA
Publication Date
Apr 07, 2021
Volume
12
Identifiers
DOI: 10.3389/fphys.2021.620438
Source
Frontiers
Keywords
Disciplines
  • Physiology
  • Original Research
License
Green

Abstract

The present study investigated the angiotensin II (Ang II) responses in rat femoral veins taken from 2-kidney-1clip (2K1C) hypertensive rats at 4 weeks after clipping, as well as the effects of exercise on these responses. In this manner, femoral veins taken from 2K1C rats kept at rest or exposed to acute exercise or to exercise training were challenged with Ang II or endothelin-1 (ET-1) in organ bath. Simultaneously, the presence of cyclooxygenase-1 (COX-1) and cyclooxygenase-2 (COX-2) were determined in these preparations by western blotting. In these experiments, femoral veins exhibited subdued Ang II responses. However, after nitric oxide (NO) synthesis blockade, the responses were higher in the femoral veins taken from animals kept at rest [0.137(0.049–0.245); n = 10] than those obtained in trained animals kept at rest [0.008(0.001–0.041); n = 10] or studied after a single bout of exercise [0.001(0.001–0.054); n = 11]. In preparations in which, in addition to NO synthesis, both the local production of prostanoids and the action of ET-1 on type A (ETA) or B (ETB) receptors were inhibited, the differences induced by exercise were no longer observed. In addition, neither ET-1 responses nor the presence of COX-1 and COX-2 in these preparations were modified by the employed exercise protocols. In conclusion, NO maintains Ang II responses reduced in femoral veins of 2K1C animals at rest. However, vasodilator prostanoids as well as other relaxing mechanisms, activated by ETB stimulation, are mobilized by exercise to cooperate with NO in order to maintain controlled Ang II responses in femoral veins.

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