Aim: The aim of this study was to investigate whether FOXO1 and FOXO3 mRNA expression in granulosa cells is the cause of unexplained infertility.
Methods: Thirty-one patients aged <40 years (13 with unexplained infertility and 18 with male partner infertility as a control group) whose serum anti-Müllerian hormone level was >0.5 ng/μL were enrolled in the study. All patients underwent oocyte retrieval under a short protocol from June 2012 to October 2013. Real-time PCR was carried out using mRNA extracted from granulosa cells retrieved from mature follicles. We compared FOXO1 and FOXO3 mRNA expression ratios in granulosa cells between the unexplained infertility group and the male infertility group. The relation between FOXO1 and FOXO3 mRNA expression ratios in granulosa cells and assisted reproduction technology clinical outcome was also examined.
Results: FOXO3 mRNA expression ratio was significantly lower in the unexplained infertility group than in the male infertility group. Moreover, FOXO3 mRNA expression ratio showed a positive correlation with both the number of retrieved oocytes and serum anti-Müllerian hormone level. A positive correlation was also identified between FOXO1 mRNA expression and total dose of hMG. As well, the number of retrieved oocytes in the unexplained infertility group was statistically lower than that in the male infertility group.
Conclusion: A lower FOXO3 mRNA expression in granulosa cells leads to poor oocyte development in patients with unexplained infertility undergoing controlled ovarian stimulation for in vitro fertilization-embryo transfer.
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