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Sperm Cryopreservation Today: Approaches, Efficiency, and Pitfalls
Sanja Ozimic1, Helena Ban-Frangez1,2, Martin Stimpfel1,2
1Department of Human Reproduction, Division of Obstetrics and Gynecology, University Medical Centre Ljubljana, 1000 Ljubljana, Slovenia.
Current Issues in Molecular Biology
|June 27, 2023
Summary
Human sperm cryopreservation offers fertility preservation but faces challenges like intracellular ice formation. Research explores techniques and cryoprotectants to minimize cryodamage and improve post-thaw sperm quality.
Area of Science:
- Reproductive Biology
- Cryobiology
- Andrology
Background:
- Sperm cryopreservation has been available since the 1950s for patients undergoing gonadotoxic therapies.
- Current methods include slow freezing and liquid nitrogen vapor freezing, with vitrification not yet clinically established.
- Achieving optimal post-thaw sperm quality remains a significant challenge.
Purpose of the Study:
- To review current human sperm cryopreservation techniques.
- To discuss the molecular and structural damage caused by cryopreservation (cryodamage).
- To compare different cryopreservation methods and explore recent advancements.
Main Methods:
- Review of existing literature on sperm cryopreservation.
- Analysis of cryodamage mechanisms including ice crystal formation, oxidative, thermal, and osmotic stress.
- Examination of cryoprotectant efficacy and the role of antioxidants.
Main Results:
- Cryopreservation can lead to structural and molecular alterations in spermatozoa.
- Key issues include intracellular ice formation, oxidative stress, and changes in sperm motility, viability, and DNA integrity.
- Cryoprotectants and antioxidants are used to mitigate cryodamage.
Conclusions:
- No single cryopreservation technique guarantees superior post-thaw sperm quality.
- Understanding cryodamage mechanisms is crucial for improving sperm cryopreservation protocols.
- Ongoing research focuses on refining techniques and cryoprotective strategies for better outcomes.
