Objective: To explore the effect of growth differential factor-9 (GDF-9) alone on cell proliferation, cell viability, steroidogenesis, and hormone-stimulated gene expression in cultured mouse theca interstitial cells. Design: Basic research. Setting: University hospital. Animal(s): Immature 3- to 4-week-old SPF KM mice obtained from the Laboratory Animal Center of Sun Yat-Sen University. Intervention(s): Addition of GDF-9 at different dosages to primary culture of mouse theca interstitial cells. Main Outcome Measure(s): Cell number, cell viability, progesterone and testosterone levels, and hormone-stimulated gene mRNA abundance. Result(s): Growth differential factor-9 mildly increased the number of mouse theca interstitial cells and cell viability in a dose-dependent manner and mildly inhibited the production of progesterone in mouse theca interstitial cells. Administration of GDF-9 at the dosages of 200 ng/mL and 400 ng/mL resulted in a significant decrease in the testosterone level compared with the control group by 60.42% and 68.76%, respectively. Growth differential factor-9 significantly suppressed Lhegr mRNA by 47.36%, Cyp11a1 mRNA by 62.30%, and Cyp17a1 mRNA by 55.39%, but had only a mild effect on Star gene expression. Conclusion(s): Growth differential factor-9 can inhibit the production of testosterone in mouse theca interstitial cells and suppress the corresponding gene expression. (C)2013 by American Society for Reproductive Medicine.
