Abstract
Ivermectin is a medication used to treat parasite infestations in humans and in veterinary medicine. Previously we showed that therapeutical doses of ivermectin impaired spermatogenesis and spermiogenesis in adult rats. The present study was proposed to understand the pathophysiological mechanism that triggered these impairments induced by ivermectin. It was a particular objective to study if ivermectin induced excessive apoptosis. Adult rats were treated with a therapeutical dose of ivermectin (subcutaneously). Their testis was evaluated for the expression of caspase-3 (a marker of apoptosis), using immunohistochemistry techniques. Results revealed that ivermectin treatment increased the expression of caspase-3 (labeled seminiferous tubules and strongly labeled tubules), as well as increased the number of tubules that presented labeled cells in the tubular lumen, compared to the data of the control group. In conclusion, a therapeutical dose of ivermectin induced expressive apoptosis in cells of the seminiferous tubules of rats, affecting the testicular natural homeostasis process, which resulted in the spermatogenesis and spermiogenesis impairments previously reported.
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