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Updated: Aug 5, 2026
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Mouse Sperm Cryopreservation and Recovery using the I·Cryo Kit
Published on: December 12, 2011
Redefining Cryopreservation Media: L-Methionine Boosts Post-Thaw Sperm Quality Across Fertility Status
Madhan Kumar P1, Parameswari R2, Babujanarthanam R3
1Department of Biotechnology, Thiruvalluvar University, Serkkadu, Vellore, 632115, TamilNadu, India.
Reproductive Sciences (Thousand Oaks, Calif.)
|July 30, 2026
Summary
Supplementing cryopreservation media with 3 mM L-methionine significantly improves sperm quality and reduces oxidative stress after thawing. This antioxidant strategy shows promise for enhancing sperm cryoprotection, especially for infertile men.
Area of Science:
- Reproductive Biology
- Biochemistry
- Andrology
Background:
- Cryopreservation in assisted reproductive technology can induce oxidative stress, impairing sperm parameters like motility, viability, and DNA integrity.
- L-methionine, an amino acid with antioxidant properties, has potential to mitigate cryo-damage to spermatozoa.
Purpose of the Study:
- To investigate the dose-dependent effects of L-methionine supplementation on post-thaw sperm quality in fertile and infertile men.
- To evaluate L-methionine's efficacy in reducing cryo-oxidative stress and improving sperm cryosurvival.
Main Methods:
- Semen samples from fertile and infertile men were cryopreserved in media supplemented with varying concentrations of L-methionine (1.5 mM, 3 mM, 6 mM) or commercial medium.
- Post-thaw analysis included sperm motility, morphology, viability, plasma membrane and acrosome integrity, oxidative stress markers (MDA), antioxidant enzyme activity (SOD, catalase), and DNA fragmentation.
Main Results:
- Supplementation with 3 mM L-methionine (M2) significantly enhanced sperm motility, viability, morphology, and acrosome integrity compared to commercial medium (p < 0.05).
- The M2 group exhibited reduced malondialdehyde (MDA) levels and increased superoxide dismutase (SOD) and catalase activity (p < 0.001), indicating potent antioxidant protection.
- DNA fragmentation was lowest in the M2 group, and Receiver Operating Characteristic (ROC) analysis showed M2 to be more sensitive for diagnosing sperm damage (AUC: 0.88).
- Higher L-methionine concentration (6 mM) did not improve, and potentially reduced, sperm quality and increased DNA fragmentation.
Conclusions:
- A 3 mM concentration of L-methionine demonstrates significant cryoprotective effects, enhancing post-thaw sperm quality and mitigating oxidative stress.
- L-methionine supplementation, particularly at 3 mM, represents a promising strategy for improving sperm cryopreservation outcomes, with notable benefits for infertile individuals.
- The 6 mM concentration may induce toxicity, highlighting the importance of optimal dosage for cryoprotective agents.
