Effect of procaine, pentoxifylline and trolox on capacitation and hyperactivation of stallion spermatozoa.

The study explores the impact of various treatments on the capacitation and hyperactivation of stallion spermatozoa, to understand reasons behind low in vitro fertilisation rates in horses. The treatments examined include procaine, pentoxifylline, and trolox, in combination with modified Whitten’s and Tyrode’s mediums. The researchers found that only procaine managed to induce hyperactivation, and when combined with capacitating Whitten’s medium, it showed the best results.

Study Design and Methodology

• The study aimed to investigate the influence of modified Whitten’s (MW) and Tyrode’s medium (MT) and treatment with procaine, pentoxifylline, and trolox on stallion spermatozoa.
• Fertilization experiments were carried out with four stallion samples, examining different parameters like motility, capacitation, acrosomal status, viability, and mitochondrial membrane potential.

Findings and Results

• No observable influence of MW and MT on sperm motility was found.
• However, a significant increase in the percentage of viable-capacitated spermatozoa was observed after incubation in capacitating MW.
• Pentoxifylline did not notably impact the motility pattern but amplified the count of live-capacitated spermatozoa.
• Trolox displayed no discernible influence on either capacitation or hyperactivation.
• Procaine was the only treatment that brought about hyperactivation, as indicated by a decrease in the proportion of progressively motile spermatozoa, straight line velocity, straightness, linearity and beat-cross frequency, and an increase in the amplitude of lateral head displacement.
• The optimal results for the induction of capacitation and hyperactivation in stallion spermatozoa were exhibited by the combination of capacitating Whitten’s medium and procaine, even after short-term incubation.

Study Conclusion

• The study concluded with evidence that the use of procaine, combined with capacitating Whitten’s medium, optimizes the induction of capacitation and hyperactivation in stallion spermatozoa.
• This outcome points towards a potential strategy for improving in vitro fertilisation rates in horses.

Implications and Future Research

• The results of the study provide valuable insights for further research aimed at improving in vitro fertilisation in horses.
• Additional in-depth studies should be carried out to validate these findings and explore other potential treatments that may affect the capacitation and hyperactivation of stallion spermatozoa.