Novel dynamic culture system to support initiation of primordial follicle growth in prepubertal mouse ovaries

ObjectiveTo evaluate the impact of dynamic in vitro culture on initiation of early follicular growth in prepubertal mouse ovaries.DesignOvaries from 8-day-old BALB/c mice were cultured either in a dynamic system (n = 28) or in a static system (n = 20) for 4 days. Uncultured 8-day-old (n = 9) or 12-day-old (n = 17) ovaries served as baseline or in vivo controls, respectively.SettingAcademic research center.Animal(s)Newborn female BALB/c mice (n = 37).Intervention(s)None.Main Outcome Measure(s)Histologic follicle classification and counting and assessment of follicular viability via immunofluorescent staining.Result(s)The percentage of secondary follicles after dynamic culture was identical to the 12-day-old in vivo control. In contrast, after static culture ovaries showed a significantly higher percentage of secondary follicles. For immunofluorescent viability assessment 6.78 follicles per ovary could be isolated after dynamic culture, whereas only 3.8 follicles per ovary could be isolated after static culture.Conclusion(s)Dynamic in vitro culture supports physiologic follicular growth initiation, comparable to that observed in vivo. In contrast, accelerated follicular growth was observed after static culture. These findings add additional evidence to the idea that dynamic culture might be a beneficial first step to initiate follicle growth in vitro within the context of fertility preservation.