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Cell allocation to the inner cell mass and the trophectoderm in rat embryos during in vivo preimplantation development

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Summary

The number of trophectoderm (TE) and inner cell mass (ICM) cells was determined by complementmediated lysis and differential staining in rat embryos collected at different times during in vivo preimplantation development. At 90 h after fertilization, two groups of morulae were discriminated according to the presence or absence of detectable ICM cells, and the analysis of their total cell number indicated that acquisition of a permeability seal between TE cells begins at the 14-cell stage. On the other hand, our data confirmed that blastocoele formation occurs after the fourth cleavage division in the rat. The total cell number increased exponentially with time in blastocysts recovered between 90 h and 127 h but the cell kinetics of TE and ICM cells were different. The proportion of ICM cells consequently varied throughout blastocyst development, with a peak value for expanded blastocysts at 103 h. Finally, a linear-quadratic relationship was found between the numbers of TE and ICM cells when all the embryos with a detectable ICM were analysed together.

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Authors and Affiliations

  1. Physiology of Human Reproduction Research Unit, OBST 5330, University of Louvain, 53 Avenue Mounier, B-1200, Brussels, Belgium

    Serge Pampfer, Ivo Vanderheyden, Bénédicte Michiels & René De Hertogh

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  1. Serge Pampfer
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  2. Ivo Vanderheyden
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  3. Bénédicte Michiels
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  4. René De Hertogh
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Pampfer, S., Vanderheyden, I., Michiels, B. et al. Cell allocation to the inner cell mass and the trophectoderm in rat embryos during in vivo preimplantation development. Roux's Arch Dev Biol 198, 257–263 (1990). https://doi.org/10.1007/BF00377392

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  • DOI: https://doi.org/10.1007/BF00377392

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