Adding cholesterol to the stallion sperm plasma membrane improves cryosurvival.

Moore, AI
·
Squires, EL
·
Graham, JK

Abstract: Cryopreservation induces partially irreversible damage to equine sperm membranes. Part of this damage occurs due to membrane alterations induced by the membrane changing from the fluid to the gel-state as the temperature is reduced lower than the membrane transition temperature. One way to prevent this damage is to increase the membrane fluidity at low temperatures by adding cholesterol to the membrane. Different concentrations of cholesterol-loaded-cyclodextrins (CLC) were added to stallion sperm to determine the CLC concentration that optimizes cryosurvival. Higher percentages of motile sperm were maintained after thawing when 1.5 mg CLC was added to sperm from stallions whose sperm do not survive freezing well, compared to control sperm from those same stallions (67% vs. 50%; P<0.05). Addition of CLCs increased the percentages of membrane intact sperm surviving cryopreservation compared to untreated sperm for all stallions (P<0.05). The amount of cholesterol that incorporated into the membranes of the sperm cells increased in a polynomial fashion (R2=0.9978) and incorporated into all sperm membranes. In addition, there was a significant loss of cholesterol from sperm membranes after cryopreservation; however, addition of CLCs to sperm prior to cryopreservation maintained higher cholesterol levels in the sperm after freezing and thawing than untreated sperm (P<0.05). Addition of CLCs also resulted in more sperm binding to the zona pellucida of bovine oocytes after cryopreservation than control sperm (48 vs. 15; P<0.05). In conclusion, CLCs improved the percentage of post-thaw viability in equine sperm as well as increased the number of sperm that bind to zona pellucida. Addition of CLCs to stallion sperm prior to cryopreservation is a simple procedure that increases the cryosurvival of cells.

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Publication Date: 2005-08-24 PubMed ID: 16122725DOI: 10.1016/j.cryobiol.2005.07.004Google Scholar: Lookup

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Journal Article
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Non-U.S. Gov't

Summary

This research summary has been generated with artificial intelligence and may contain errors and omissions. Refer to the original study to confirm details provided. Submit correction.

The research investigates the effect of adding cholesterol to stallion sperm cells to improve their survival after cryonic freezing. The study found out that adding cholesterol-loaded-cyclodextrins (CLCs) to the cells prior to freezing increases their survival rate and their ability to bind to bovine oocytes after thawing.

Objective of the Research

The research aimed to mitigate the damage cryopreservation does to equine sperm membranes by increasing their fluidity at low temperatures.
This was achieved by adding different concentrations of cholesterol-loaded-cyclodextrins (CLCs) to the membranes to find the optimal concentration for cryosurvival.

Methodology and Findings

CLC was added to stallion sperm cells at different concentrations.
The researchers found that stallion sperm cells with low cryosurvival rates maintained higher percentages of motile sperm after thawing when 1.5 mg of CLC was added.
Addition of CLCs also increased the percentages of membrane intact sperm surviving cryopreservation compared to untreated sperm for all stallions.
There was a significant loss of cholesterol from sperm membranes after cryopreservation, but the addition of CLCs to sperm prior to cryopreservation maintained higher cholesterol levels in the sperm after freezing and thawing.
In addition, adding CLCs resulted in more sperm binding to the zona pellucida of bovine oocytes after cryopreservation than control sperm.

Conclusion

The study concludes that adding CLCs to stallion sperm cells prior to cryopreservation improves the percentage of post-thaw viability.
It also increases the number of sperm cells that can successfully bind to the zona pellucida after thawing.
Therefore, the simple procedure of adding CLCs to stallion sperm cells prior to cryopreservation has been shown to significantly improve cell cryosurvival.

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APA

Moore AI, Squires EL, Graham JK. (2005). Adding cholesterol to the stallion sperm plasma membrane improves cryosurvival. Cryobiology, 51(3), 241-249. https://doi.org/10.1016/j.cryobiol.2005.07.004

Publication

Cryobiology

ISSN: 0011-2240

NlmUniqueID: 0006252

Country: Netherlands

Language: English

Volume: 51

Issue: 3

Pages: 241-249

Researcher Affiliations

Moore, Amanda I

Department of Biomedical Science, Colorado State University, Fort Collins, CO 80523, USA.

Squires, Edward L

Graham, James K

MeSH Terms

Animals
Cattle
Cell Membrane / metabolism
Cell Survival
Cholesterol / administration & dosage
Cholesterol / metabolism
Cryopreservation / methods
Cryopreservation / veterinary
Cryoprotective Agents
Cyclodextrins
Female
Horses
In Vitro Techniques
Male
Membrane Fluidity / drug effects
Microscopy, Fluorescence
Semen Preservation / methods
Semen Preservation / veterinary
Sperm-Ovum Interactions
Spermatozoa / cytology
Spermatozoa / metabolism
Zona Pellucida / metabolism

Citations

This article has been cited 16 times.

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