Exercise increases the angiotensin II effects in isolated portal vein of trained rats

Autor(es)

Chies, Agnaldo Bruno ^[1] ; Rossignoli, Patricia de Souza ^{[2, 1]} ; Daniel, Elias Fernando ^[3]

Afiliação do(s) autor(es)

^[1] Fac Med Marilia, Pharmacol Lab, BR-519030 Marilia, SP - Brazil

^[2] Biosci Inst Botucatu, Dept Pharmacol, Botucatu, SP - Brazil

^[3] Univ Marilia, Fac Pharm & Biochem, Marilia, SP - Brazil

• Tipo de documento: Artigo Científico
• Fonte: Peptides; v. 31, n. 5, p. 883-888, MAY 2010.
• Citações Web of Science: 3

Resumo

Training in rats adapts the portal vein to respond vigorously to sympathetic stimuli even when the animal is re-exposed to exercise. Moreover, changes in the exercise-induced effects of angiotensin II, a potent venoconstrictor agonist, in venous beds remain to be investigated. Therefore, the present study aimed to assess the effects of angiotensin II in the portal vein and vena cava from sedentary and trained rats at rest or submitted to an exercise session immediately before organ bath experiments. We found that training or exposure of sedentary animals to a single bout of running exercise does not significantly change the responses of the rat portal vein to angiotensin II. However, the exposure of trained animals to a single bout of running exercise enhanced the response of the rat portal vein to angiotensin II. This enhancement appeared to be territory-specific because it was not observed in the vena cava. Moreover, it was not observed in endothelium-disrupted preparations and in preparations treated with N(omega)-nitro-L-arginine methyl ester hydrochloride, indomethacin, BQ-123 or BQ-788. These data indicate that training causes adaptations in the rat portal vein that respond vigorously to angiotensin II even upon re-exposure to exercise. This increased response to angiotensin II requires an enhancement of the vasocontractile influence of endothelin beyond the influence of nitric oxide and vasodilator prostanoids. (C) 2010 Elsevier Inc. All rights reserved. (AU)

• Processo FAPESP: 05/51550-4 - Influência do exercício físico sobre as respostas vasomotoras de veias isoladas de rato a agonistas de alfa-adenoceptores e a Angiotensina II
• Beneficiário: Agnaldo Bruno Chies
• Modalidade de apoio: Auxílio à Pesquisa - Regular