Repository of Research and Investigative Information

Repository of Research and Investigative Information

Ilam University of Medical Sciences

The protective effects of melatonin against cryopreservation-induced oxidative stress in human sperm

Tue May 28 04:38:43 2024

(2015) The protective effects of melatonin against cryopreservation-induced oxidative stress in human sperm. International Journal of Immunopathology and Pharmacology. pp. 69-76. ISSN 0394-6320

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Reactive oxygen species (ROS) production and lipid peroxidation during cryopreservation harm sperm membrane and as a result reduce the recovery of motile sperm. The antioxidant effects of melatonin on different cells have been widely reported. This study was aimed to evaluate changes in post-thaw motility, viability, and intracellular ROS and malondialdehyde (MDA) in response to the addition of melatonin to human sperm freezing extender. Semen of 43 fertile men was collected and each sample was divided into eight equal aliquots. An aliquot was analyzed freshly for viability, motility, and intracellular ROS and MDA. Melatonin was added to the recommended human freezing extender to yield six different final concentrations: 0.001, 0.005, 0.01, 0.05, 0.1, and 1 mM. A control group without melatonin was also included. Two weeks after cryopreservation, samples were thawed and pre-freeze analyses repeated. Obtained results showed that cryopreservation significantly (P <0.05) reduces viability and motility, but increases intracellular ROS and MDA of human sperm. The semen extender supplemented with various doses of melatonin (except for 0.001 mM) significantly (P <0.05) increased motility and viability, but decreased intracellular ROS and MDA levels of cryopreserved sperm after the thawing process, as compared with the control group. We also found that the most effective concentration of melatonin in protecting human spermatozoa from cryopreservation injuries was 0.01 mM. These findings suggest that melatonin exerts its cryoprotective effects on spermatozoa possibly by counteracting intracellular ROS, and thereby reduces MDA generation. This finally leads to increase of post-thaw viability and motility of cryopreserved spermatozoa.

Item Type: Article
Keywords: cryopreservation malondialdehyde melatonin motility oxygen reactive species human-spermatozoa in-vitro lipid-peroxidation bull spermatozoa parameters motility frozen semen fertility additives Immunology Pathology Pharmacology & Pharmacy
Page Range: pp. 69-76
Journal or Publication Title: International Journal of Immunopathology and Pharmacology
Journal Index: ISI
Volume: 28
Number: 1
Identification Number:
ISSN: 0394-6320
Depositing User: مهندس مهدی شریفی

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