Improvement of development of equine preantral follicles after 6 days of in vitro culture with ascorbic acid supplementation.

The study seeks to evaluate the impact of various concentrations of ascorbic acid on the development of equine preantral follicles. It found that after six days of in vitro culture with ascorbic acid supplementation, there was noticeable improvement in follicular development.

Research Methodology

• The study examined the effects of ascorbic acid, also commonly known as vitamin C, when added to a minimum essential medium (MEM+) in different amounts (25, 50, and 100 μg/mL).
• This medium was used for in vitro cultivation of equine preantral follicles for two or six days.
• Nine ovarian tissue fragments were obtained from each contralateral ovary collected posthumously from five seasonal anestrus mares, totaling 5 samples.
• These samples were initially treated with a PBS solution enriched with penicillin and streptomycin before transport to the lab, where ascorbic acid in various concentrations was added for the in vitro culture experiment.

Culture Groups

• In total, nine groups were established; a control group, 2-day and 6-day cultures without ascorbic acid, and three different ascorbic acid groups (25, 50 and 100 μg/mL) each cultured for two and six days.
• The differences in the stages (primordial, primary, secondary, antral) and the morphology (normal or abnormal) of the preantral follicles were studied and evaluated using histological analysis, with over 4450 sections taken into consideration.

Key Findings

• Only 4.85% of the evaluated histology sections contained visible follicles. Of these, 120 were in primordial stage and the rest were undergoing various stages of development.
• At the end of the six-day culture period, preantral follicle development was noticeably different in groups supplemented with 50 and 100 μg/mL of ascorbic acid when compared to the other groups.
• Around 43.5% of the follicles were identified as morphologically normal.
• The study indicated that when MEM+ was supplemented with 50 and 100 μg/mL of ascorbic acid, there was a positive impact on follicular development in the cultured ovarian fragments.

Conclusion

Through this study, the researchers have established that ascorbic acid supplementation significantly boosts equine preantral follicle development during in vitro cultivation. The ideal concentration of ascorbic acid appears to range from 50 to 100 μg/mL in MEM+ for a culture period of six days. This could have potential implications in equine reproductive research and practices.