Reduced Foxo3a, FoxL2, and p27 mRNA expression in human ovarian tissue in premature ovarian insufficiency.

Abstract

Previous studies have suggested that deletion of Foxo3a, FoxL2, PTEN, p27, and AMH leads to early exhaustion of the primordial follicle pool and premature ovarian insufficiency (POI) in transgenic mice. Our aim was to assess for the first time, to our knowledge, messenger RNA (mRNA) expression of these genes and AMHR2 in human ovarian tissue from women with POI. We hypothesized that these genes would be underexpressed in POI women compared with healthy controls. mRNA levels were evaluated by quantitative reverse transcription-polymerase chain reaction and real-time polymerase chain reaction in cortical ovarian tissue obtained by laparoscopy from Caucasian Greek women with POI (n = 5) and healthy women with normal menstruation (n = 6). Morphological analysis of the ovarian biopsies was also performed to assess the presence of primordial or other types of growing follicles. Ovarian tissue from POI patients showed lower Foxo3a, FoxL2, and p27 mRNA expression compared with controls (p = 0.017, p = 0.017, and p = 0.030, respectively). mRNA expression of AMH, PTEN, and AMHR2 was reduced in ovarian biopsies from POI patients as well. However, these differences were not statistically significant (p = 0.143, p = 0.247, and p = 0.662, respectively). Morphological analysis showed complete lack of follicular structures in all POI biopsies. Our findings suggest a possible role of Foxo3a, FoxL2, and p27 in the pathogenesis of human POI, which may prove to be of great diagnostic-therapeutic value. Further larger studies are needed to identify a similar pattern for AMH, PTEN, and AMHR2 and to investigate gene expression at a protein level.