Objective To observe acupuncture effects on endometrial receptivity of the rats with polycystic ovary syndrome （PCOS） treated by ovarian stimulation with Clomiphene to explore its mechanisms. Methods eGOS rat model was experimentally induced by subcutaneous injection of oil solution of dehydroepiandrosterone （DHEA） in immature （24-day-old） female rats for continuous 20 days. The same dose of oil was given for an equivalent length of time to animals in a control group （Group Con）. The rats with PCOS were randomly divided into a model group （group M）, a Clomiphene treatment group （group C）, a Clomiphene plus acupuncture group （group C＋ A）. The treatments were given for 5 days since 80 days after birth. Half of the rats were killed by decapitation after treatment finished, and the serum, uteri and endometria were obtained. The other half mated with male rats, and they were killed at the 8th day of pregnancy. We observed the implantation number and condition of pregnant uteri. Results Compared with group C, the animals in group C＋A had higher implantation rate and more average implanted embryos （P〈0. 01 ）, higher serum estradiol （E2） level （P〈0.01 ）, better development of endometrium, and increased mRNA and protein expressions of molecular markers of endometrial receptivity （P〈0.01）, which were closer to those in the control group. Conclusion Acupuncture could improve poor endometrial receptivity of PCOS rats with ovarian stimulation by citrated Clomiphene and promote implantation. The effects may be related with its up-regulation of serum E2 level, mRNA and protein expressions of molecular markers of endometrial receptivity.
