RESUMEN
We compared the protective effects of melatonin and montelukast against cisplatin-induced testicular damage. Adult male rats were assigned to one of four groups: a control group, a cisplatin (Cis) group treated with a single intraperitoneal injection of 7 mg/kg cisplatin, a cisplatin + melatonin group (Cis-Mel) and a cisplatin + montelukast group (Cis-Mon) each treated with the same dose of cisplatin together with either oral melatonin (20 mg/kg) or oral montelukast (10 mg/kg) in 2 ml water from day 1 to day 10 starting on the day of the cisplatin injection. Cisplatin-induced oxidative stress, with a significant increase in testicular malonedialdehyde (MDA), decreased testicular glutathione (GSH), histological testicular damage and body weight loss. Additionally, increased abnormal sperm forms and decreased count and motility were noted. Melatonin and montelukast both rescued GSH concentrations, increased sperm count and motility and decreased abnormal forms. Montelukast resulted in better rescue of weight loss, while greater improvement in sperm count and testicular pathology, and a trend for decreased MDA were noted with melatonin. These findings suggest that melatonin and montelukast protect against different aspects of cisplatin-induced toxicity. Future studies should assess whether both drugs may have additive benefit when used in combination.