Chronic restraint stress increases angiotensin II potency in the rat carotid: role of cyclooxygenases and reactive oxygen species

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Chronic restraint stress increases angiotensin II potency in the rat carotid: role of cyclooxygenases and reactive oxygen species

Journal of Pharmacy and Pharmacology
First published:

Hariane Côco, Larissa Pernomian, Priscila C. Pereira, Mayara S. Gomes, Katia C. Marchi, Alexandre H. Lopes, Thiago M. Cunha, Carlos R. Tirapelli, Ana M. de Oliveira

Abstract

Objectives

To investigate the mechanisms underlying the effects of chronic restraint stress on the vascular contractile response induced by angiotensin (Ang) II in rat carotid.

Methods

Concentration–response curves for AngII were obtained in endothelium-intact or endothelium-denuded carotid rings, in the absence or presence of SC-560 (COX-1 inhibitor), SC-236 (COX-2 inhibitor), wortmannin (PI3K-Akt inhibitor), ML171 (NOX-1 inhibitor), VAS2870 (NOX-4 inhibitor), tiron (math formula scavenger) or PEG-catalase (H2O2 scavenger). 6-ketoPGF1α, TXB2, math formula or H2O2 levels and superoxide dismutase and catalase activity or expression were also measured in rat carotid.

Key findings

Stress increased AngII potency in rat carotid. Muscular COX-1 or COX-2-derived metabolites negatively modulated AngII-induced contraction in control rat carotid. Endothelial COX-1 or COX-2-derived metabolites positively modulated AngII-induced contraction in stressed rat carotid. PI3K-Akt, NOX-1, NOX-4, math formula and H2O2 positively modulated AngII-induced contraction in stressed rat carotid. Stress increased 6-ketoPGF1α or H2O2 generation and reduced catalase activity in rat carotid. Protein expression of COX-1, NOX-4 or p-Akt was increased in stressed rat carotid.

Conclusions

Stress increases AngII potency in rat carotid by a mechanism that involves the increased generation of PGI2 and H2O2 and the activation of Akt pathway. Such mechanism could play a pathophysiological role in cardiovascular diseases correlated with stress.

SEGUIR LEYENDO

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