Abstract
An efficient co-culture system, especially with oviductal or uterine epithelial cells, is important not only for the production of high quality embryos, but also for the study of the molecular dialogue between embryos and their maternal environment. Although mouse embryos have been co-cultured successfully with oviductal epithelial cells (OECs) from several species, studies on the effects of species and functionality of OECs are few. Reports concerning the necessity of direct contact between the embryo and OECs and about the culture of mouse embryos in medium conditioned with heterologous OECs have been controversial. In this study, pronuclear embryos from Kunming mice, characterized by an obvious two-cell block in vitro, were co-cultured with mouse, goat, and chick OECs. The functionality of OECs was determined by analyzing the cell cycle, apoptosis, the numbers of mitochondria and cilia, and the ability both to support embryonic development and to remove hypoxanthine from the culture medium. The necessity of direct contact between OECs and embryos was studied by repeated renewal of culture medium with fresh conditioned medium, the culture of embryos in plastic wells connected by tunnels to wells with OEC monolayers, and the co-culture of embryos separated from OECs by a filter. Both goat and chick OECs supported mouse embryonic development, but their embryotrophic lifespan was shorter than that of the mouse OECs. Whereas media conditioned with mouse OECs supported mouse embryonic development satisfactorily, medium conditioned with goat OECs supported little development. Immediate dialogue between heterologous OECs and embryos was essential for efficient co-culture, whereas direct contact between the two cell types was not; neither dialogue nor contact was needed between isologous OECs and embryos. Embryotrophic activity and the ability to remove hypoxanthine from conditioned medium declined with time after confluence and number of passages of OECs, mainly because of apoptosis and dedifferentiation. Thus, the species and functionality of OECs have profound effects on their molecular dialogue with co-cultured embryos, and efficient co-culture depends upon both positive and negative conditioning.
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Many thanks are due to Dr. Sarah Seidel at the International Embryo Transfer Society for critical reading of the manuscript.
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This study was supported by grants from the China National Natural Science Foundation (nos. 30430530 and 30571337) and the “973” Project of the Chinese Science and Technology Ministry (no. G200016108).
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Tan, XW., Ma, SF., Yu, JN. et al. Effects of species and cellular activity of oviductal epithelial cells on their dialogue with co-cultured mouse embryos. Cell Tissue Res 327, 55–66 (2007). https://doi.org/10.1007/s00441-006-0236-y
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DOI: https://doi.org/10.1007/s00441-006-0236-y