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Endometrial profilin 1: A key player in embryo-endometrial crosstalk

  • Lee, Chang-Jin (Department of Biomedical Science, School of Life Science, CHA University) ;
  • Hong, Seon-Hwa (CHA Fertility Center Bundang, School of Medicine, CHA University) ;
  • Yoon, Min-Ji (Department of Biomedical Science, School of Life Science, CHA University) ;
  • Lee, Kyung-Ah (Department of Biomedical Science, School of Life Science, CHA University) ;
  • Ko, Jung-Jae (Department of Biomedical Science, School of Life Science, CHA University) ;
  • Koo, Hwa Seon (CHA Fertility Center Bundang, School of Medicine, CHA University) ;
  • Kim, Jee Hyun (CHA Fertility Center Bundang, School of Medicine, CHA University) ;
  • Choi, Dong Hee (CHA Fertility Center Bundang, School of Medicine, CHA University) ;
  • Kwon, Hwang (CHA Fertility Center Bundang, School of Medicine, CHA University) ;
  • Kang, Youn-Jung (Department of Biomedical Science, School of Life Science, CHA University)
  • Received : 2019.12.05
  • Accepted : 2019.12.14
  • Published : 2020.06.30

Abstract

Objective: Despite extensive research on implantation failure, little is known about the molecular mechanisms underlying the crosstalk between the embryo and the maternal endometrium, which is critical for successful pregnancy. Profilin 1 (PFN1), which is expressed both in the embryo and in the endometrial epithelium, acts as a potent regulator of actin polymerization and the cytoskeletal network. In this study, we identified the specific role of endometrial PFN1 during embryo implantation. Methods: Morphological alterations depending on the status of PFN1 expression were assessed in PFN1-depleted or control cells grown on Matrigel-coated cover glass. Day-5 mouse embryos were cocultured with Ishikawa cells. Comparisons of the rates of F-actin formation and embryo attachment were performed by measuring the stability of the attached embryo onto PFN1-depleted or control cells. Results: Depletion of PFN1 in endometrial epithelial cells induced a significant reduction in cell-cell adhesion displaying less formation of colonies and a more circular cell shape. Mouse embryos co-cultured with PFN1-depleted cells failed to form actin cytoskeletal networks, whereas more F-actin formation in the direction of surrounding PFN1-intact endometrial epithelial cells was detected. Furthermore, significantly lower embryo attachment stability was observed in PFN1-depleted cells than in control cells. This may have been due to reduced endometrial receptivity caused by impaired actin cytoskeletal networks associated with PFN1 deficiency. Conclusion: These observations definitively demonstrate an important role of PFN1 in mediating cell-cell adhesion during the initial stage of embryo implantation and suggest a potential therapeutic target or novel biomarker for patients suffering from implantation failure.

Keywords

References

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