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Vertebrate reproductive science and technology
RESEARCH ARTICLE

Decreased expression of aquaporin 2 is associated with impaired endometrial receptivity in controlled ovarian stimulation

Dan Zhang A B E , Gufeng Xu A , Runju Zhang A , Yimin Zhu A , Huijuan Gao A , Caiyun Zhou C , Jianzhong Sheng D and Hefeng Huang B E
+ Author Affiliations
- Author Affiliations

A Department of Reproductive Endocrinology, Women’s Hospital, School of Medicine, Zhejiang University, 1 Xueshi Road, Hangzhou, Zhejiang, 310006, China.

B Key Laboratory of Reproductive Genetics, Ministry of Education of China, Zhejiang University, 866# Yuhangtang Rd, Hangzhou, 310058, China.

C Department of Pathology, Women’s Hospital, School of Medicine, Zhejiang University, 1 Xueshi Road, Hangzhou, Zhejiang, 310006, China.

D Department of Pathophysiology, School of Medicine, Zhejiang University, 866# Yuhangtang Rd, Hangzhou, 310058, China.

E Corresponding authors. Emails: huanghefg@hotmail.com; zhangdan61@hotmail.com

Reproduction, Fertility and Development 28(4) 499-506 https://doi.org/10.1071/RD13397
Submitted: 21 November 2013  Accepted: 20 July 2014   Published: 19 September 2014

Abstract

Recently, there has been evidence of decreased implantation rates with in vitro fertilisation and embryo transfer due to controlled ovarian stimulation (COS). The aim of this study was to investigate the effect of COS on embryo implantation and the role of aquaporin 2 (AQP2). We recruited eight patients who underwent COS and 40 matched controls. Endometrial samples were collected on Day 4~8 after injection of human chorionic gonadotrophin in the COS group and in the mid-secretory phase in the control group. Human endometrial morphological changes after COS were examined and expression of AQP2, leukaemia inhibitory factor (LIF) and integrin B3 (ITGB3) were determined by quantitative polymerase chain reaction, western blotting and immunohistochemistry in human endometrium and Ishikawa cells. Attachment rates were obtained using the embryo attachment test. The results showed that endometrial epithelial cells from the COS group were disrupted and lacked pinopodes. Messenger RNA and protein levels of AQP2, LIF and ITGB3 decreased in endometrial samples from the COS group. Knockdown of AQP2 resulted in reduced expression of LIF and ITGB3 and reduced embryo attachment rates. In conclusion, impaired endometrial receptivity in patients who underwent COS is correlated with a decreased expression of AQP2.

Additional keywords: assisted reproductive technology, embryo, endometrium, implantation.


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