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Antioxidative effect of melatonin on human spermatozoa
1Vuk Vrhovac Institute, University Clinic for Diabetes, Endocrinology and Metabolic Diseases, Medical Faculty University of Zagreb, Croatia.
Archives of Andrology
|February 26, 2000
Summary
Melatonin can reduce lipid peroxidation in sperm, but is less effective than vitamin E analogs. Its low concentration in semen suggests a minor role in preventing sperm damage in vivo.
Area of Science:
- Reproductive Biology
- Biochemistry
- Oxidative Stress Research
Background:
- Lipid peroxidation (LPO) is a damaging process affecting sperm membrane integrity.
- Understanding antioxidants that protect sperm is crucial for male fertility research.
- Melatonin's potential antioxidant properties in reproductive tissues warrant investigation.
Purpose of the Study:
- To investigate the in vitro efficacy of melatonin in suppressing experimentally induced lipid peroxidation in human sperm.
- To compare the LPO-inhibitory effect of melatonin with that of Trolox, a vitamin E analog.
Main Methods:
- Analyzed 41 infertile men's sperm samples.
- Induced LPO using iron/ascorbate and measured malondialdehyde (MDA) formation via thiobarbituric acid assay.
- Incubated sperm with varying concentrations of melatonin (2-6 mmol) and Trolox (0.1-0.2 mmol).
Main Results:
- Melatonin demonstrated a concentration-dependent decrease in MDA formation, indicating reduced LPO.
- A significant reduction in LPO was observed with 6 mmol melatonin (p < .005) and in the presence of ferrous ions (p < .02, p < .05).
- Melatonin was found to be 40-fold less efficient than Trolox in reducing LPO by 50%.
Conclusions:
- Melatonin exhibits in vitro antioxidant activity against sperm lipid peroxidation.
- Melatonin is significantly less potent than Trolox in inhibiting LPO.
- Given physiological nanomolar semen concentrations, melatonin's in vivo role in preventing sperm LPO is likely minimal.