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Involvement of insulin in early development of mouse one-cell stage embryos

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Abstract

Recent studies have suggested that growth factors and hormones play important roles in cell proliferation and differentiation during early embryonic development. In the present study, we examined the expression and localization of insulin in the mouse oocytes and one-cell stage embryos by quantitative ELISA, RT-PCR, Western blot and immunofluorescence. In the mouse oocytes and one-cell stage embryos, expression of insulin was uniformly distributed in the cytoplasm. We also examined the expression, activity and localization of mTOR (mammalian target of rapamycin) and p70S6K. The expression of mTOR and p70S6K was not significantly different at the cell cycle of mouse one-cell stage embryos. mTOR and S6K were distributed evenly in the cytoplasm at G1, G2 and M phase phase, but at S phase, the distribution of mTOR and S6K was around the pronucleus. At different phases, the activity of mTOR fluctuated. We also used the PI3K specific inhibitor-Wortmannin to investigate the cleavage rate of eggs. The result showed that the rate obviously decreased. When the mTOR specific inhibitor Rapamycin was used, the first mitotic division of the mouse one-cell stage embryo was delayed. These results suggested that insulin was expressed both in mouse oocytes and one-cell stage embryos, and may play functional roles in regulation of mouse early embryogenesis by activating the signal pathway of PI3K/PKB/mTOR/S6K.

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Authors and Affiliations

  1. Department of Biochemical and Molecular Biology, China Medical University, Shenyang, 110001, China

    BingZhi Yu, Zhe Zhang, Xin Deng, XiaoYan Xu, Chen Feng, YanXiao Li, Cheng Cui, WenHui Su, HongMei Zhao & DaHai Yu

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  1. BingZhi Yu
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  2. Zhe Zhang
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  3. Xin Deng
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  7. Cheng Cui
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Correspondence to BingZhi Yu.

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Supported by the National Natural Science Foundation of China (Grant No. 30570945)

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Yu, B., Zhang, Z., Deng, X. et al. Involvement of insulin in early development of mouse one-cell stage embryos. SCI CHINA SER C 51, 767–773 (2008). https://doi.org/10.1007/s11427-008-0113-x

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  • DOI: https://doi.org/10.1007/s11427-008-0113-x

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