title: Peripheral reproductive organ health and melatonin: ready for prime time.
abstract: Melatonin has a wide variety of beneficial actions at the level of the gonads and their adnexa. Some actions are mediated via its classic membrane melatonin receptors while others seem to be receptor-independent. This review summarizes many of the published reports which confirm that melatonin, which is produced in the ovary, aids in advancing follicular maturation and preserving the integrity of the ovum prior to and at the time of ovulation. Likewise, when ova are collected for in vitro fertilization-embryo transfer, treating them with melatonin improves implantation and pregnancy rates. Melatonin synthesis as well as its receptors have also been identified in the placenta. In this organ, melatonin seems to be of particular importance for the maintenance of the optimal turnover of cells in the villous trophoblast via its ability to regulate apoptosis. For male gametes, melatonin has also proven useful in protecting them from oxidative damage and preserving their viability. Incubation of ejaculated animal sperm improves their motility and prolongs their viability. For human sperm as well, melatonin is also a valuable agent for protecting them from free radical damage. In general, the direct actions of melatonin on the gonads and adnexa of mammals indicate it is an important agent for maintaining optimal reproductive physiology.
authors.affiliation: Department of Cellular and Structural Biology, UT Health Science Center at San Antonio, San Antonio, TX 78229, USA. reiter@uthscsa.edu.
authors.forename: Russel J
authors.initials: RJ
authors.lastname: Reiter
authors.forename: Sergio A
authors.initials: SA
authors.lastname: Rosales-Corral
authors.forename: Lucien C
authors.initials: LC
authors.lastname: Manchester
authors.forename: Dun-Xian
authors.initials: DX
authors.lastname: Tan
mesh_terms: D000818:Animals; D005260:Female; D005836:Genitalia, Female / Q000502:physiology*; D005837:Genitalia, Male / Q000502:physiology*; D006262:Health; D006801:Humans; D008297:Male; D008550:Melatonin / Q000378:metabolism*
chemical_list: D008550:Melatonin
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