Comparative study of nitric oxide production induced by selective estrogen receptors alpha and beta agonists in rats
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Resumo
BACKGROUND AND OBJECTIVES: Nitric oxide (NO) is a potent vasodilator and estrogen-mediated vasodilation that increases NO production. The association of the vascular endothelium, gender and vasodilation induced by estrogen is due to the activation of two estrogen receptors, alpha (ERa) and beta (ERb). The aim of this study was to compare NO production stimulating receptors ERa and ERb with the use of selective agonists in thoracic aortas of rats. METHODS: Aortic rings were either treated with 17 β-estradiol (17-BE2); acetylcholine (Ach); 4,4’,4-[4-propil-(1H)-pirazol-1,3,5-triyl]tris-phenol (PPT), and 2,3-Bis(4-hydroxyphenyl)-propionitrile (DPN), or left untreated, and the concentration of NO was determined by spectrophotometry method. RESULTS: The females presented a higher basal concentration of nitrite than males. PPT determined increased production of nitrite in both females and males, compared to 17-beta-estradiol (17-BE2). In males, the production of nitrite induced by DPN and PPT was higher than that induced by 17- BE2. The stimulation with 17-BE2 increased the production of nitrite in females compared to males. Regardless the gender, the stimulation of aortic rings by PPT caused a greater production of nitrite compared to that induced by 17-BE2. Interestingly, the stimulation of aortic rings from males with DPN provided an increase in the nitrite production compared to the levels induced by 17-BE2 incubation. CONCLUSION: The stimulation of estrogen receptor (ER) by PPT provides greater production of nitrite than 17-BE2 regardless of gender; in males, the stimulation of ER by DPN provides bigger production of nitrite than 17-BE2; the basal production of nitrite is higher in females compared to males.
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Eu (nome do autor responsável) _______________________________________________ declaro que o presente artigo intitulado ___________________________________é original, não tendo sido submetido à publicação em qualquer outro periódico nacional ou internacional, quer seja em parte ou em sua totalidade. Declaro, ainda, que uma vez publicado na revista Revista da Sociedade Brasileira de Clinica Médica, editada pela Sociedade Brasileira de Clínica Médica, o mesmo jamais será submetido por um dos demais co-autores a qualquer outro meio de divulgação científica impressa ou eletrônica.
Por meio deste instrumento, em meu nome e dos demais co-autores, cedo os direitos autorais do referido artigo à Revista da Sociedade Brasileira de Clinica Médica, e declaro estar ciente de que a não observância deste compromisso submeterá o infrator a sanções e penas previstas na Lei de Proteção de Direitos Autorias (n 9610 19 de fevereiro de 1998) que altera, atualiza e consolida a legislação sobre direitos autorais e dá outras providências. Disponível em: http://www.planalto.gov.br/ccivil_03/leis/l9610.htm
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