Human sperm vitrification: A scientific report.

Area of Science:

• Reproductive Medicine
• Cryobiology
• Spermatozoa Cryopreservation

Background:

• Traditional sperm freezing can cause cellular damage due to ice crystal formation.
• Sperm vitrification utilizes ultrarapid freezing in a cryoprotectant solution to prevent ice crystal formation.
• This method preserves intracellular structures and minimizes plasma membrane damage.

Purpose of the Study:

• To review the sperm vitrification methodology developed by the authors' research group.
• To present studies demonstrating its application in human reproduction therapy.
• To discuss the efficacy and future potential of sperm vitrification.

Main Methods:

• Spermatozoa are selected and resuspended in a vitrification solution containing non-permeable cryoprotectants (saccharides, protein) and are free of seminal plasma.
• The sperm-vitrification solution mixture is plunged directly into liquid nitrogen for ultrarapid freezing.
• The technique involves cryoprotectants like sucrose, trehalose, dextran, and albumin.

Main Results:

• Vitrification preserves high sperm motility and DNA integrity by avoiding ice crystal formation.
• The technique maintains the protective structures of the cytoskeleton.
• Vitrified sperm can be stored at -80°C, simplifying logistics and enhancing operator safety.

Conclusions:

• Sperm vitrification is a highly effective cryopreservation technique for human spermatozoa.
• It has been successfully applied in assisted reproductive technologies such as in vitro fertilization and intrauterine insemination.
• The method has resulted in healthy live births, demonstrating its clinical efficacy.