The balloon catheter induces an increase in contralateral carotid artery reactivity to angiotensin II and phenylephrine

Autor(es)

Accorsi-Mendonça, D. ^[1] ; Corrêa, F. M. A. ; Paiva, T. B. ; Souza, H. P. de ; Laurindo, Francisco Rafael Martins ; Oliveira, A. M. de

Afiliação do(s) autor(es)

^[1] Universidade de São Paulo (USP). Faculdade de Medicina de Ribeirão Preto. Departamento de Farmacologia - Brasil

• Tipo de documento: Artigo Científico
• Fonte: British Journal of Pharmacology; v. 142, n. 1, p. 79-88, May 2004.
• Área do conhecimento: Ciências Biológicas - Farmacologia
• Assunto(s): Farmacologia Dilatação com balão Fenilefrina Neuropeptídeos Angiotensina II

Resumo

The effects of balloon injury on the reactivity of ipsilateral and contralateral carotid arteries were compared to those observed in arteries from intact animals (control arteries). Carotid arteries were obtained from Wistar rats 2, 4, 7, 15, 30 or 45 days after injury and mounted in an isolated organ bath. Reactivity to angiotensin II (Ang II), phenylephrine (Phe) and bradykinin (BK) was studied. Curves were constructed in the absence or presence of endothelium or after incubation with 10 muM indomethacin, 500 muM valeryl salicylate or 0.1 muM celecoxib. Phe, Ang II and BK maximum effects (Emax) were decreased in ipsilateral arteries when compared to control arteries. No differences were observed among pD2 or Hill coefficient. Emax to Phe (4 and 7 days) and to Ang II (15 and 30 days) increased in the contralateral artery. In addition, Phe or Ang II reactivity was not significantly different in aorta rings from control or carotid-injured animals. The increased responsiveness of contralateral artery was not due to changes in carotid blood flow or resting membrane potential. The endothelium-dependent inhibitory component is not present in the contraction of contralateral arteries and it is not related to superoxide anion production. Indomethacin decreased contralateral artery responsiveness to Phe and Ang II. Valeryl salicylate reduced the Ang II response in contralateral and control arteries. Celecoxib decreased the Phe Emax of contralateral artery. In conclusion, decreased endothelium-derived factors and increased prostanoids appear to be responsible for the increased reactivity of contralateral arteries after injury. (AU)

• Processo FAPESP: 99/05434-0 - Efeito temporal da formação da camada neointima sobre a reatividade de artéria carótida e fluxo sanguíneo após injúria vascular por "balloon catheter" em carótida de ratos normotensos e hipotensos
• Beneficiário: Daniela Accorsi Mendonça Eichenberger
• Modalidade de apoio: Bolsas no Brasil - Doutorado