Summary
Monolayers of 2 different populations of uterine cells and of fetal fibroblasts were evaluated for the support of rat embryo development in vitro. Compared to controls, cultures performed in Earle's buffered saline solution (EBSS) alone, the cleavage rate of 2-cell embryos to the 4-cell stage was significantly increased when the embryos were cocultured for 24 h with mixed uterine stromal and myometrial cells (70.7 vs. 56.0%;P<0.01). Coculture of 2-cell embryos with either uterine epithelial-stromal or stromal-myometrial cells in medium TC 199 (M199) for 24 h significantly increased the cleavage rate to the 4-cell stage compared to controls in the same medium (respectively, 78.3 and 77.6 vs. 49.9%;P<0.01). The development was not improved when fibroblasts were used as feeder cells. After 48 h, the proportion of 4-cell embryos showing cellular fragmentation was significantly decreased in the presence of either epithelial-stromal or stroma-myometrial cells in M199 compared to controls (respectively, 18.4 and 20.0 vs. 43.8%;P<0.01). Coculture in EBSS or with fibroblasts failed to prevent embryo degeneration. In one coculture with stromal-epithelial cells in M199, 6/11 embryos proceeded beyond the 4-cell stage, two of them reaching the 8-cell stage. No embryo developed beyond that stage in our study. Although considerable efforts remain necessary to achieve further growth, these results suggest that coculture offers promise as a means of supporting the in vitro development of rat embryos.
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Pampfer, S., Vanderheyden, I., Michiels, B. et al. Co-culture of two-cell rat embryos on cell monolayers. In Vitro Cell Dev Biol 26, 944–948 (1990). https://doi.org/10.1007/BF02624467
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DOI: https://doi.org/10.1007/BF02624467