Deterioration of stored culture media as monitored by a sperm motility bioassay
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J Stewart-Savage1, B D Bavister
1Department of Veterinary Science, University of Wisconsin, Madison 53706.
Abstract:
A hamster sperm motility bioassay was used to monitor medium quality during storage. The media studied were (1) TL-PVA, a modified Tyrode's solution; (2) TLP-PVA, a defined medium that supports hamster sperm motility but does not support capacitation; and (3) TALP-PVA (TLP-PVA + serum albumin), which supports hamster sperm survival and capacitation. Each medium was stored at 5 and -20 degrees C and tested every two weeks. All of the media deteriorated with increased storage time, but at different rates (TLP-PVA greater than TL-PVA greater than TALP-PVA). The deterioration of the media correlated with an increase in pH during storage, probably due to a loss of CO2 and bicarbonate. Albumin, added after storage, was able to rescue frozen TL-PVA.
Insights
Medium quality for sperm storage degrades over time, with TLP-PVA deteriorating fastest. Storage conditions and medium composition, like albumin in TALP-PVA, impact sperm viability and capacitation. Albumin can rescue frozen TL-PVA.
Area of Science:
- Reproductive Biology
- Biochemistry
Background:
- Sperm preservation media quality is crucial for assisted reproductive technologies.
- Understanding medium degradation during storage is essential for maintaining sperm viability and function.
Purpose of the Study:
- To assess the impact of storage duration and temperature on the quality of three different sperm preservation media.
- To evaluate the role of medium composition, including serum albumin, in sperm motility and capacitation.
Main Methods:
- A hamster sperm motility bioassay was employed to monitor medium quality.
- Three media (TL-PVA, TLP-PVA, TALP-PVA) were stored at 5°C and -20°C for varying durations.
- Changes in medium pH were correlated with observed deterioration.
Main Results:
- All media showed deterioration with increased storage time, with TLP-PVA degrading fastest, followed by TL-PVA, then TALP-PVA.
- Medium deterioration correlated with an increase in pH, likely due to CO2 and bicarbonate loss.
- Serum albumin, when added post-storage, could restore the quality of frozen TL-PVA.
Conclusions:
- Storage conditions significantly affect sperm preservation media quality.
- TALP-PVA demonstrates superior stability compared to TL-PVA and TLP-PVA.
- Serum albumin plays a vital role in maintaining or rescuing the quality of certain sperm media, particularly after freezing.