Journal
BIOLOGY OF REPRODUCTION
Volume 83, Issue 5, Pages 852-858Publisher
OXFORD UNIV PRESS INC
DOI: 10.1095/biolreprod.110.085852
Keywords
antioxidant; cryopreservation; cryoprotectant; osmotic stress; sperm; spermatozoa motility; stress
Categories
Funding
- [CZ.1.05/2.1.00/01.0024]
- [MSM 6007665809]
- [LC06073]
- [1AA608030801]
- [ME10015]
- [QH92308]
- [QH82118]
- [QH82119]
- [GAJU 003/2010/Z]
- [046/2010/Z]
- [047/2010/Z]
- [200701029]
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Cryopreservation causes osmotic changes and oxidative damage that have sublethal and lethal effects on spermatozoa. We examined these osmotic and oxidative effects on common carp spermatozoa motility; membrane integrity; levels of thiobarbituric-acid-reactive substance (TBARS) and carbonyl groups (CP); and the activity of superoxide dismutase (SOD), glutathione reductase, and glutathione peroxidase (GPx). Sperm was diluted in dimethyl sulfoxide (DMSO) and ethylene glycol-based extenders, followed by equilibration, freezing, and thawing. Equilibration in DMSO extender resulted in a significant reduction of spermatozoa motility, but motility was induced in those spermatozoa following dilution with saline buffer, which usually inhibits undiluted spermatozoa motility. Spermatozoa velocity and membrane integrity decreased with both extenders following freezing and thawing. No significant difference in levels of TBARS or CP, or in SOD activity, was seen in samples equilibrated with either extender. The freeze/thaw process induced significantly higher levels of TBARS, CP, and GPx activity, but did not affect the level of SOD. Glutathione reductase activity was inhibited in samples exposed to DMSO extender. Ethylene glycol should be considered a preferred cryoprotective agent for common carp spermatozoa to reduce osmotic and oxidative stress during cryopreservation.
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