RESUMO
Sildenafil is an important phosphodiesterase inhibitor used to treat a range of diseases, including cardiovascular disease, prostatic hyperplasia and pulmonary hypertension. Its main mechanism of action is the inhibition of phosphodiesterase 5, leading to increased intracellular cyclic guanosine 3',5'-monophosphate. This second messenger plays an interesting role in the reproductive tract. The aim of the present study was to evaluate the effect of Sildenafil on folliculogenesis and fertility in mice. To do so, C57BL/6 wild-type mice and inducible nitric oxide synthase knockout (iNOS(-/-)) mice were treated with Sildenafil, and reproductive variables were evaluated. The treated and control animals underwent estrous cycle and fertility assay. Lipid profile, serum nitric oxide levels and the expression of endothelial nitric oxide synthase, inducible nitric oxide synthase and guanylate cyclase were evaluated. Additionally, ovaries were submitted to histological and morphological analysis. The findings demonstrated that chronic treatment with Sildenafil had no effect on folliculogenesis or fertility in C57BL/6 mice, suggesting that this drug can be safely used by women of childbearing age.
Assuntos
Fertilidade/efeitos dos fármacos , Óxido Nítrico Sintase Tipo III/efeitos dos fármacos , Óxido Nítrico Sintase Tipo II/efeitos dos fármacos , Citrato de Sildenafila/farmacologia , Animais , Ciclo Estral/efeitos dos fármacos , Ciclo Estral/fisiologia , Camundongos Endogâmicos C57BL , Camundongos Knockout , Óxido Nítrico/metabolismo , Óxido Nítrico Sintase Tipo II/metabolismo , Citrato de Sildenafila/administração & dosagemRESUMO
Sildenafil is a potent and selective inhibitor of phosphodiesterase-5 (PDE5) and is considered first-line therapy for erectile dysfunction. Nowadays, Sildenafil is used extensively throughout the world on patients with pulmonary hypertension. However, few studies have evaluated the possible side effects of chronic Sildenafil treatment on the male reproductive system, specifically in the prostate. In the present study, it was demonstrated via morphological and ultrastructural analysis that chronic treatment with Sildenafil induced an enhancement of the glandular activity of the prostate. In addition, mice treated with Sildenafil showed a significant increase in testosterone serum levels. However, no statistically significant differences were observed in nitric oxide serum levels, or in sGC, eNOS, PSA and TGF-ß prostatic expression. In conclusion, the present study suggests that chronic use of Sildenafil does not cause evident prostatic damage, and therefore, can be used pharmacologically to treat a variety of disorders.
