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Sperm quality improvement in cryopreserved human semen
1Department of Urology, Cleveland Clinic Foundation, Ohio 44195, USA.
The Journal of Urology
|September 1, 1996
Summary
Spermatozoa separation using Percoll density gradients before cryopreservation significantly improves post-thaw motility and longevity compared to unprocessed samples. Washed sperm retain motility for up to 24 hours, benefiting fertility treatments.
Area of Science:
- Reproductive Biology
- Andrology
- Cryopreservation Science
Background:
- Cryopreservation of spermatozoa is crucial for assisted reproductive technologies.
- Assessing post-thaw sperm quality is essential for successful outcomes.
- Sperm preparation techniques can impact cryopreserved sperm viability.
Purpose of the Study:
- To evaluate the effect of Percoll density gradient separation on post-thaw sperm motility.
- To compare the motility and viability of washed versus raw cryopreserved spermatozoa over time.
Main Methods:
- Ten healthy donors provided semen samples.
- Spermatozoa were either processed using Percoll density gradients (washed) or left unprocessed (raw).
- Both raw and washed samples were cryopreserved and then assessed for motility, motion characteristics, viability, and membrane integrity at 0, 1, 6, and 24 hours post-thaw.
Main Results:
- Both raw and washed spermatozoa showed decreased motility and motion characteristics post-thaw and with extended incubation.
- Unprocessed spermatozoa exhibited significant declines in viability and membrane integrity at 6 and 24 hours.
- Washed spermatozoa demonstrated significantly better motility retention over 24 hours compared to raw samples (p < 0.03).
Conclusions:
- Percoll separation before cryopreservation selects for spermatozoa with enhanced motility longevity.
- This preparation method offers improved sperm quality for up to 24 hours post-thaw.
- Enhanced sperm quality can benefit couples undergoing intrauterine insemination (IUI).