Consequences of acute or chronic stress on the vascular actions of angiotensin II and angiotensin 1-7 in the rat carotid artery.

Author(s)

Tamy Midori Banin

• Document type: Master's Dissertation
• Press: Ribeirão Preto.
• Institution: Universidade de São Paulo (USP). Faculdade de Ciências Farmacêuticas de Ribeirão Preto (PCARP/BC)
• Defense date: 2011-06-17

Examining board members

Ana Maria de Oliveira; Sâmia Regiane Lourenço Joca; Rita de Cassia Aleixo Tostes Passaglia

• Advisor: Ana Maria de Oliveira

Abstract

The chronic or acute stress can alter various functions of the cardiovascular system, causing heart disease. The renin-angiotensin system (RAS), a major participant in control of these functions, is profoundly affected in response to stress. Angiotensin II (Ang II) is recognized as a multifunctional hormone that influences many cellular processes important for the regulation of vascular function, including regulation of vascular tone, cell growth, among others. Another component of the RAS is angiotensin 1-7 (Ang 1-7), their actions involve an increase in vascular production of prostanoid vasodilators, nitric oxide and endothelium-derived hyperpolarizing factor. The aim of this study was to evaluate the consequences of chronic or acute stress on vasomotor activity of Ang II and Ang 1-7, the mechanisms involved in contraction and relaxation induced, respectively, by these peptides and the changes in the expression of AT1, AT2 and Mas in rat carotid artery. Chronic stress has led to decreased body weight gain of animals, promoted remodeling of carotid arteries with a significant increase in the medial layer accompanied by a reduction of the relaxation response to Ang 1-7, although the expression of their receptors (Mas) was increased. The highest expression of Ang II receptors, AT1 and AT2, triggered by acute stress did not alter the contractile response of this peptide. In carotid arteries of animals subjected to chronic stress is observed reduction of Emax of Ang II and Ang 1-7 after incubation with indomethacin, suggesting that prostanoids are involved in the vascular response of both Ang II and Ang 1-7 in exposed situations prolonged stress. The greater expression of nitrotyrosine in carotids from animals exposed to both acute or chronic stress, demonstrates that nitric oxide and oxidative stress appear to be related to vasomotor changes in response to peptides Ang II and Ang 1-7. It was shown that acute stress increases plasma levels of corticosterone and the production of reactive oxygen species (ROS). These data suggest that acute and chronic stress by immobilization, alter the expression of receptors of RAS and vasomotor activity in carotid artery in response to Ang II and Ang 1-7 by different cellular mechanisms. (AU)

• FAPESP's process: 09/01386-4 - Cellular mechanisms involved in relaxation induced by angiotensin II and angiotensin 1-7 in carotid artery of rats after acute and chronic stress
• Grantee: Tamy Midori Banin
• Support Opportunities: Scholarships in Brazil - Master