Cholesterol Loaded Cyclodextrin Supplementation Enhances the Cholesterol-to-Phospholipid Ratio and Diminishes Oxidative Stress in Jack Spermatozoa During Cryopreservation.

The research article focuses on the influence of cholesterol supplementation on semen quality and oxidative stress levels in jack (Martina franca) spermatozoa during cryopreservation. The study suggests that cholesterol supplementation reduces oxidative stress and enhances semen quality post-thaw by stabilizing sperm membranes and increasing the cholesterol-to-phospholipid ratio.

Research Methodology

The study was carried out on forty-eight ejaculates collected from six jack stallions. The researchers divided each fresh semen sample into five equal fractions after introducing a primary extender with varied levels of cholesterol-loaded cyclodextrin (CLC). The concentrations used were 0, 1, 1.5, 2, and 3 mg/mL CLC. Following adjustments to achieve a consistent spermatozoa concentration, the samples were cryopreserved using tailored freezing protocols.

Evaluation of Samples

• The researchers evaluated various seminal parameters, the cholesterol-to-phospholipid ratio, and the oxidative status of the jack spermatozoa at all stages of cryopreservation.
• Oxidative stress levels were assessed by measuring the levels of malondialdehyde, glutathione, and total antioxidant capacity.

Results

The results showed a significant increase in the mean percent values for seminal quality parameters and oxidative parameters in the CLC-treated groups, with the highest values observed at a CLC concentration of 2 mg per 120 × 10 spermatozoa.

Conclusion

The study concluded that introducing CLC supplementation before cryopreservation significantly reduced oxidative stress levels and increased the cholesterol-to-phospholipid ratio in the semen during the cryopreservation process. Additional findings include:

• Lowered lipid peroxidation levels
• Reduced damage to sperm plasma and acrosome membranes
• Improvement in the stability and integrity of post-thaw sperm

These results highlight the importance of cholesterol supplementation for maintaining semen quality during cryopreservation, potentially opening up new ways to enhance the efficiency of semen storage methods.