Essential actions of melatonin in protecting the ovary from oxidative damage

Area of Science:

• Reproductive Biology
• Endocrinology
• Cellular Physiology

Background:

• Reactive species are integral to ovarian function but can cause oxidative stress, damaging cellular molecules.
• Oxidative damage significantly impacts female fertility by disrupting ovarian physiology.
• Melatonin, a potent antioxidant, effectively protects against reactive species due to its amphiphilic nature.

Purpose of the Study:

• To review the role of reactive species in ovarian physiology and the protective effects of melatonin.
• To explore melatonin's functions in different ovarian developmental stages and its impact on oocyte quality.

Main Methods:

• Literature review summarizing existing research on reactive species, oxidative stress, and melatonin in the ovary.
• Analysis of studies investigating melatonin's effects on granulosa cells, oocyte maturation, and follicle development.

Main Results:

• Melatonin protects ovarian cells, including oocytes and granulosa cells, from oxidative damage.
• Follicular fluid melatonin levels correlate with oocyte quality and may prevent follicular atresia by reducing apoptosis.
• Melatonin demonstrates varied protective functions throughout follicle development, oocyte maturation, and the luteal phase.

Conclusions:

• The balance of reactive oxygen species and antioxidants, particularly melatonin, is critical for ovarian function and female fertility.
• Melatonin's antioxidant properties are vital for protecting ovarian macromolecules and ensuring oocyte competence.
• Adequate melatonin levels in follicular fluid are associated with improved oocyte quality and successful fertilization potential.