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Etv5 safeguards trophoblast stem cells differentiation from mouse EPSCs by regulating fibroblast growth factor receptor 2

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Abstract

Previous studies have demonstrated that transcription factor Etv5 plays an important role in the segregation between epiblast and primitive endoderm at the second fate decision of early embryo. However, it remains elusive whether Etv5 functions in the segregation between inner cell mass and trophectoderm at the first cell fate decision. In this study, we firstly generated Etv5 knockout mouse embryonic stem cells (mESCs) by CRISPR/Cas9, then converted them into extended potential stem cells (EPSCs) by culturing the cells in small molecule cocktail medium LCDM (LIF, CHIR99021, (S)-(+)-dimethindene maleate, minocycline hydrochloride), and finally investigated their differentiation efficiency of trophoblast stem cells (TSCs). The results showed that Etv5 knockout significantly decreased the efficiency of TSCs (CDX2+) differentiated from EPSCs. In addition, Etv5 knockout resulted in higher incidence of the differentiated cells with tetraploid and octoploid than that from wild type. Mechanistically, Etv5 was activated by extracellular-signal-regulated kinase (ERK) signaling pathway; in turn, Etv5 had a positive feedback on the expression of fibroblast growth factor receptor 2 (FGFR2) which lies upstream of ERK. Etv5 knockout decreased the expression of FGFR2, whose binding with fibroblast growth factor 4 was essentially needed for TSCs differentiation. Collectively, the findings in this study suggest that Etv5 is required to safeguard the TSCs differentiation by regulating FGFR2 and provide new clues to understand the specification of trophectoderm in vivo.

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Acknowledgements

We thank Dr. Jinglong Zhang for helping on generation of Etv5 KO mESCs, Xiaomin Du for helping on bisulfite sequencing experiment, Juqing Zhang and Zhenshuo Zhu for helping on vector construction in this work. This research was supported by grants from State Key Laboratory of Genetically Engineered Veterinary Vaccines (AGVSKL-ZY-201802, AGVSKL-ZD-202009), NWAFU Fundamental Research Funds for the Central Universities (2452019055), and National Natural Science Foundation of China (31571521, 31301218).

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  1. Kui Zhu and Yuan Liu contributed equally to this work.

Authors and Affiliations

  1. College of Veterinary Medicine, Shaanxi Center of Stem Cells Engineering and Technology, Northwest A&F University, 712100, Yangling, China

    Kui Zhu, Yuan Liu, Chen Fan, Mengyao Zhang, Hongxia Cao, Xin He, Na Li, Jinlian Hua, Huayan Wang, Yan Wang & Shiqiang Zhang

  2. State Key Laboratory of Genetically Engineered Veterinary Vaccines, Yebio Bioengineering Co.Ltd of Qingdao, Qingdao, China

    Dianfeng Chu, Fang Li, Min Zou & Gencheng Fan

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  1. Kui Zhu
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Correspondence to Gencheng Fan or Shiqiang Zhang.

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Zhu, K., Liu, Y., Fan, C. et al. Etv5 safeguards trophoblast stem cells differentiation from mouse EPSCs by regulating fibroblast growth factor receptor 2. Mol Biol Rep 47, 9259–9269 (2020). https://doi.org/10.1007/s11033-020-05969-4

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