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The Changes of Cytoskeletal Proteins Induced by the Fast Effect of Estrogen in Mouse Blastocysts and Its Roles in Implantation

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Abstract

It is necessary for estrogen to activate mouse blastocysts, so that they can attach to endometrial epithelium in implantation and in our previous research, we have proved estrogen can induce a fast increase in intracellular calcium of mouse blastocysts through acting on G protein-coupled receptor 30 (GPR30), which further promotes their implantation. Moreover, there has been evidence that cytoskeletal proteins are involved in integrin-mediated adhesion of many kinds of cells, which also plays an important role in implantation. To prove estrogen induces rapidly the changes of cytoskeletal proteins in mouse blastocysts and its roles in implantation, we first used immunofluorescence staining and laser confocal microscopy to investigate the fast effect of estrogen on the expression and localization of cytoskeletal proteins in mouse blastocysts. Second, we used electroporation associated with RNA interference to knock down one of the important cytoskeletal proteins, talin, in the mouse blastocyst cells to investigate the fast effect of estrogen on the localization of integrins and the binding activity of integrins with their ligand fibronectin (FN). At last, mouse blastocysts with different treatments were cultured with FN or uterine epithelial cell line Ishikawa in vitro, respectively, and transferred into the bilateral uterine horns of recipient mice, to study the role of the fast effect of estrogen on cytoskeletal proteins in blastocysts adhesion and implantation. Our results indicated that estradiol (E2), E2 conjugated with bovine serum album (E2-BSA) and G-1 (a GPR30-specific agonist) could induce cytoskeletal protein talin, vinculin, and actin to cluster in the mouse blastocysts, while G15 (a GPR30-specific antagonist) and BAPTA (a calcium chelator) may block this effect induced by E2-BSA. Furthermore, E2-BSA could induce the clustering and relocalization of integrin β1 and β3 and increase the FN-binding activity of integrins in blastocyst cells, while E2-BSA could not induce these effects in the blastocysts pretreated with talin-small interfering RNA (siRNA). Meanwhile, the adhesion rate and implantation rate of blastocysts pretreated with talin-siRNA were significantly lower than those pretreated with control-siRNA. We provided the first evidence that the fast effect of estrogen might cause the clustering of the cytoskeletal proteins in mouse blastocyst cells and further induce the changes of localization and functional activity of integrins in the blastocyst cells, which play important roles in blastocyst implantation.

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Authors and Affiliations

  1. Department of Physiology, West China School of Preclinical and Forensic Medicine, Sichuan University, Chengdu, Sichuan, China

    Shi-mao Zhang MD, Lin-lin Yu PhD, Ting Qu MD, Dong-zhi Yuan PhD, Sheng Zhang PhD, Qian Xu PhD, You-bo Zhao MD, Jin-hu Zhang BS & Li-min Yue PhD

  2. Chengdu Women and Children’s Central Hospital, Chengdu, Sichuan, China

    Shi-mao Zhang MD & Lin-lin Yu PhD

  3. Department of Obstetrics & Gynecology, West China Second University Hospital, Key Laboratory of Birth Defects and Related Diseases of Women and Children (Sichuan University), Ministry of Education, Sichuan University, Chengdu, China

    Ying Hu MD

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  1. Shi-mao Zhang MD
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  2. Lin-lin Yu PhD
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Correspondence to Li-min Yue PhD.

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Zhang, Sm., Yu, Ll., Qu, T. et al. The Changes of Cytoskeletal Proteins Induced by the Fast Effect of Estrogen in Mouse Blastocysts and Its Roles in Implantation. Reprod. Sci. 24, 1639–1646 (2017). https://doi.org/10.1177/1933719117697126

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