O Topiramato está incluído na mais nova geração de drogas antiepilépticas e é conhecido que apresenta múltiplos mecanismos de ação. A droga também é usada como redutor de massa corporal. Seu efeito nos tecidos reprodutivos e no ciclo estral merece maior atenção. Então, este estudo teve como objetivo investigar os possíveis efeitos da droga sobre os tecidos ovariano e uterino, ciclo estral e alguns parâmetros fetais de ratas Wistar não epilépticas. No Experimento I, as fêmeas receberam água de torneira (Cgrupo controle; n=8) ou Topiramato (grupo TPM; 100 mg/kg; n=8), oralmente por 6 semanas. Foram monitorados o ciclo estral e o consumo de ração. As secções ovarianas e uterinas foram examinadas em microscopia de luz. No Experimento II, ratas prenhes dos grupos C e TPM receberam os tratamentos durante os períodos de pré-implantação, implantação ou organogênese. Nas fêmeas do Experimento I, o TPM não teve efeito sobre o consumo de alimento, peso corpóreo final, peso corpóreo semanal e ciclo estral. O peso ovariano e uterino foi similar em ambos os grupos. A cinética da foliculogênese não foi Topiramate (TPM) is included in the newer generation of antiepileptic drugs and is known to have multiple mechanisms of action. The drug has also been used for reducing body weight. Its effect on reproductive tissues and estrous cycle deserve greater attention. Then, this study aimed to investigate possible effects of the drug on ovarian and uterine tissues, estrous cycle and some fetal parameters of non-epileptic Wistar rats. In Experiment I, females received tap water (C -Control group; n=8) or Topiramate (TPM group; 100 mg/kg; n=8), orally for 6 weeks. The estrous cycle and food consumption were monitored. Ovarian and uterine sections were examined under light microscopy. In Experiment II, pregnant rats of C and TPM groups received treatments during the pre-implantation, implantation or organogenesis period. In females of Experiment I, TPM had no effect on the food consumption, final body weight, weekly body weight and estrous cycle. Ovarian and uterine weight was similar in both groups. The kinetics of folliculogenesis was unaffected by treatment with the drug. There was a significant (p<0.05) decrease in endometrial thickness of TPM-group. In Experiment II, fetal weight was decreased (p<0.05) in all periods of TPM exposure. There was no effect of treatment on fetal external morphology. In conclusion, the findings indicate that TPM promotes discrete alterations in the uterine tissue, and causes decrease on the fetus weight after exposure in different gestational periods. ResumoKeyword: Antiepileptic drug. Folliculogenesis. Endometrium. Outcome pregnant.
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