[Change and significance of growth differentiation factor 9 and bone morphogenetic protein expression during oocyte maturation in polycystic ovary syndrome patients with ovarian stimulation].

OBJECTIVE

To investigate the expression pattern and significance of two important oocyte-secreted factors: growth differentiation factor 9 (GDF9) and bone morphogenetic protein 15 (BMP15) during oocyte maturation in women with polycystic ovary syndrome (PCOS) and infertile women due to husband factors.

METHODS

Total of 25 oocytes [9 at germinal vesicle GV stage, 9 at MI stage and 7 at MII stage] were obtained from 12 patients with PCOS and 82 oocytes (29 at GV stage, 26 at MI stage and 27 at MIIstage) were from 56 controls. The nested quantitative real time (RT) PCR was used to detect the abundance of GDF9 and BMP15 mRNA in each oocyte.

RESULTS

(1) The expression level of GDF9 mRNA at the GV stage, MI stage and MII stage in PCOS group were 44.8 (4.2 - 529.0), 27.6 (9.8 - 172.7) and 49.0 (0.2 - 65.9) respectively, the expression in were 149.9 (55.4 - 387.9), 29.9 (2.5 - 205.8) and 657.8 (149.4 - 1376.2) in control group, respectively. The expression of GDF9 mRNA at MII stage was significantly lower in PCOS group than in controls (P < 0.01), however, the differences didn't reach statistical significant at GV or MI stage between the two groups (P > 0.05). The expression of GDF9 mRNA displayed some changes at different maturation stage in controls (P < 0.05, P < 0.01), however, the expression didn't demonstrate any dynamic changes in PCOS group (P > 0.05). (2) The expression level BMP15 mRNA at the GV stage, MI stage and MII stage in PCOS group were 0.1 (0.1 - 22.0), 3.2 (0.6 - 55.0) and 6.4 (3.2 - 8.5), respectively, the expression were 41.6 (6.5 - 96.1), 4.0 (2.0 - 10.4) and 49.7 (2.3 - 139.5) in control group, respectively. The expression of BMP15 mRNA at GV stage was significantly lower in PCOS group than in controls (P < 0.01), however, the differences were not significant at MI or MII stage between the two groups (P > 0.05). The expression of BMP15 mRNA also displayed some changes at different maturation stage in controls (P < 0.05), however, the level didn't demonstrate any dynamic changes in PCOS group (P > 0.05).

CONCLUSION

It was suggested that the low expression of oocyte secreted factors in mature oocytes from PCOS patients might be associated with impaired oocyte quality and developmental competence in PCOS.