[Melatonin and its role in human reproduction]

Area of Science:

• Reproductive Endocrinology
• Chronobiology

Background:

• Melatonin influences seasonal variations in reproductive activity.
• Circadian rhythm disruptions are linked to reproductive seasonality.
• Melatonin is vital for spermatogenesis and folliculogenesis.

Purpose of the Study:

• To explore melatonin's role in seasonal reproductive regulation.
• To investigate melatonin's impact on human fertility.
• To examine light therapy's potential in treating infertility.

Main Methods:

• Review of existing literature on melatonin and reproduction.
• Analysis of seasonal variations in reproductive hormones.
• Correlation of melatonin levels with menstrual cycle irregularities and ovulation timing.

Main Results:

• Melatonin influences seasonal gonadal activity and circadian reproductive rhythms.
• It plays a role in both male and female gametogenesis.
• Bright light therapy may aid infertility by modulating melatonin.
• Seasonal changes in gonadotropins and steroids correlate with melatonin synthesis.
• Melatonin may inhibit GnRH pulse generator, affecting gonadotropin secretion, pubertal onset, and ovulation timing.
• Anovulation and irregular cycles increase in winter; ovulation timing varies seasonally.

Conclusions:

• Melatonin is a key regulator of seasonal reproductive functions.
• Its influence extends to gametogenesis, puberty, and ovulation.
• Melatonin metabolism abnormalities may contribute to infertility.
• Light exposure warrants further investigation as a therapeutic strategy for infertility.