The present study is aimed to explore the impact of experimental diabetes and insulin replacement on epididymal secretory products, sperm count, motility, and fertilizing ability in albino rats. Prepubertal and adult male Wistar strain rats were made diabetic with a single intraperitoneal injection of streptozotocin (STZ), at 120 and 65 mg/kg body weight for prepubertal and adult rats, respectively. After 3 days of STZ administration, insulin was given to a group of diabetic rats at a dose of 3 U/100 g body weight, subcutaneously and killed after 20 days of treatment. STZ-diabetes significantly reduced the epididymal tissue concentrations of testosterone, androgen-binding protein, sialic acid, glycerylphosphoryl choline, and carnitine, suggesting its adverse effects on the secretory activity and concentrating capacity of epididymal epithelium. Impaired cauda epididymidal sperm motility and fertility (in vivo) of STZ-diabetic rats imply the defective sperm maturation. Insulin replacement prevented these changes either partially or completely. From the above findings, it is evident that STZ-diabetes has an adverse effect on sperm maturation, which may be due to the decrease in the bioavailability of testosterone and epididymal secretory products.
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