Low dose of melatonin ameliorates cryptorchidism-induced spermatotoxicity in rats

Introduction

Cryptorchidism has been associated with spermatotoxicity and oxidative stress while melatonin is a well-known anti-oxidant. This study investigated the possible ameliorative effect of melatonin on cryptorchidism-induced spermatotoxicity and oxidative stress.

Methods

Thirty six male Wistar rats were randomised into sham-operated (n = 18) and bilaterally cryptorchid (n = 18) groups, each of which were subdivided into 3 oral treatment groups (n = 6 rats each) that received normal saline, low dose (4 mg/kg) and high dose (10 mg/kg) melatonin.

Results

Cryptorchidism reduced sperm parameters, oestradiol, luteinising hormone, follicle stimulating hormone and glutathione peroxidase activity, but increased testosterone and lactate dehydrogenase activity. The cryptorchidism-induced spermatotoxicity and oxidative stress were ameliorated by low dose of melatonin but exacerbated by its high dose.

Discussion

Melatonin’s effect on cryptorchidism-induced spermatotoxicity is dose-dependent.