Mechanistic insights into the protective role of Senna occidentalis extract in mitigating sodium arsenite-induced testicular toxicity.

Sodium arsenite (NaAsO₂), a common environmental pollutant, negatively affects male fertility by impairing spermatogenesis, disrupting hormones, and inducing oxidative stress in testicular tissue. This study evaluated the protective effect of Senna occidentalis aqueous leaf extract (SOLAq) against NaAsO₂-induced reproductive toxicity in male Wistar rats. Twenty-five rats were randomly assigned to the five groups: Group 1 served as the control. Group 2 received NaAsO₂ (5 mg/kg) daily. Treatment groups 3 and 4 received a single daily dose of 250 mg/kg and 500 mg/kg of SOLAq  +  NaAsO₂ (5 mg/kg), respectively. Group 5 received Silymarin (50 mg/kg)  +   5 mg/kg of NaAsO₂. All treatments were administered orally for 28 days. Rat treated with only NaAsO₂ had a significant decrease (p < 0.05) in sperm concentration, motility, and viability besides a significant increase in immotile and morphologically abnormal spermatozoa and an increase in the MDA level together with a significant decrease in CAT, SOD, and GSH activity. Also, NaAsO₂ suppresses hormonal levels of FSH, LH and testosterone and affects testicular histopathological alterations. SOLAq co-treatment alleviated these effects by enhancing the antioxidant status, improving the sperm characteristics, normalizing hormonal profile, and maintaining testicular tissue structure in a dose-dependent manner.