The Effect of Vitamin D3 supplementation on Flunitrazepam-Induced testicular dysfunction in Wistar rats

Prolonged flunitrazepam use has been reported to be increasing among young adolescents, and it has been reported to induce hyperprolactinemia, causing gross impairment of testicular function, ultimately resulting in male infertility. Hence, this current study seeks to examine the possible protective potential of the micronutrient Vitamin D3 in mitigating flunitrazepam-induced testicular dysfunction. Adult male rats (Wistar strain), weighing 200-220 g, were categorized into four groups: Vehicle [0.3 ml of distilled water and 0.2 ml of olive oil, the respective solvents for flunitrazepam (Fluni) and Vitamin D3 (V.D3)], Fluni [0.35 mg/kg], V.D3 [0.01 mg/kg], and Fluni [0.35 mg/kg] + V.D3 [0.01 mg/kg]; these groups were treated orally for 56 days before the testes and epididymides were removed for biochemical and histological processing. Vitamin D3 supplementation significantly prevented hyperprolactinemia and sperm cell damage, reduced testicular lipid peroxidation, and significantly increased serum concentrations of reproductive hormones, testicular steroidogenic enzymes, antioxidants, and improved inflammatory markers. It also improved sperm energy utilization, quality, and transmembrane pump activities, with a marked recovery of the epididymal smooth muscles and testicular interstitial and spermatogonial cells in the flunitrazepam-treated rats. This present study shows that Vitamin D3 supplementation prevents impairment of testicular functions and ensures improved sperm function in flunitrazepam-exposed rats. Meanwhile, further molecular studies and clinical trials are encouraged to explore Vitamin D3's possible intervention in drug-induced male infertility, given the limitations of animal studies.