Summary
A polyclonal antibody (SP-2) has been produced, which recognizes antigens expressed in epidermal cells of Pleurodeles waltlii embryos. The antigens appear first at the end of gastrulation in the external surface of the embryo and are selectively expressed in ectodermally derived epidermal structures. Ectodermal commitment was investigated using cell cultures and blastocoel graft experiments. The four animal blastomeres of the 8-cell stage as well as the animal cap explants of the early gastrula stage cultured in vitro differentiate into epidermis, and SP-2 antigens are expressed. The expression of SP-2-defined antigens is inhibited both in vivo and in vitro by the inductive interaction of chordomesoderm. Once dissociated, ectodermal cells do not react with SP-2. Conversely, the aggregation of ectodermal cells may restore the expression of SP-2 antigens. Transplantation of animal cap explants or isolated ectodermal cells into the blastocoel of a host embryo at the early gastrula stage shows that only cells integrated into the epidermis express the marker antigens. When vegetal cells were dissociated from donor embryos before the mid-blastula stage and implanted into the blastocoel of host embryos at the early gastrula stage, their progeny were found in all germ layers, cells that were found in the host epidermis were stained with SP-2, whereas those contributing to mesoderm and endoderm were not. Thus the acquisition of cell polarity in epidermal differentiation and the organization of cells into epithelial structures are essential for SP-2-defined antigen expression.
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Shi, D.L., Riou, J.F., Darribère, T. et al. A study of cell interactions involved in Pleurodeles waltlii epidermal differentiation. Roux's Arch Dev Biol 197, 247–257 (1988). https://doi.org/10.1007/BF00380018
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DOI: https://doi.org/10.1007/BF00380018