Abstract
The aim of this study is to investigate the effects of subchronic exposure to carbendazim on spermatogenesis and fertility in male rats. Ninety-eight healthy male rats were divided into four groups: three exposure groups and a control group. Carbendazim was administered orally to male rats at 0, 20, 100 and 200 mg/kg for 80 days prior to mating. Each male was cohabited with an unexposed female for a maximum of 5 days. In 100 and 200 mg/kg groups, the mating index was relatively increased, the fertility index was decreased, and the testis weight, the sperm counts and motility were also decreased. The levels of luteinizing hormone (LH) showed a decreasing tendency and there was a statistical difference between the 200 mg/kg group and the control group. There were no obvious effects on the levels of follicle stimulating hormone (FSH) and testosterone (T). Histopathological evaluation showed atrophic seminiferous tubules, decreased germ cells, and increased sloughing of germ cells. Flow cytometric analysis of the testicular tissue revealed that carbendazim inhibited meiotic transformation and interfered with the spermatogenic process. These results suggest that carbendazim has adverse effects on spermatogenesis, resulting in reduced fertility in male rats.
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