Summary
The composition of the surface coat in embryonic cells ofXenopus laevis was examined by agglutination and fluorescent staining with lectins.
Cells of early and mid gastrula stages were agglutinated by lectins specific for D-mannose, D-galactose, L-fucose, N-acetyl-D-glucosamine and N-acetyl-D-galactosamine. No differences in agglutinability among ectoderm, mesoderm and endoderm cells were observed with lectins specific for D-mannose, D-galactose and N-acetyl-D-galactosamine, though agglutination of gastrula cells with fluorescent lectins revealed considerable differences in the intensity of lectin binding among cells within an aggregate. These differences in amount of lectin bound were not related to cell size or morphology. Patches of fluorescent material formed on the cells, suggesting that lectin receptors are mobile in the plane of the plasma membrane.
In the early cleavage stages intensive lectin binding occurs only at the boundary between preexisting and nascent plasma membranes. The external surface of the embryo has few lectin receptors up to the late gastrula stage. The unpigmented nascent plasma membranes, when exposed to fluorescent lectins, do not assume any fluorescence distinguishable from the background autofluorescence of yolk, in stages up to the mid-blastula. From this stage onwards lectin binding was observed on the membranes of the reverse side of surface layer cells and on the membranes of deep layer cells. During gastrulation there is an accumulation of lectin-binding material on surfaces involved in intercellular contacts.
The significance of lectin binding material for morphogenesis is discussed.
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Nosek, J. Changes in the cell surface coat during the development ofXenopus laevis embryos, detected by lectins. Wilhelm Roux' Archiv 184, 181–193 (1978). https://doi.org/10.1007/BF00848253
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DOI: https://doi.org/10.1007/BF00848253