Abstract
Expression patterns of intermediate filament proteins have been studied during early mouse embryo development. For this purpose, pre-implantation embryos at different stages of development after in vitro fertilization were studied using antibodies to cytokeratins, vimentin and lamins, using the indirect immunofluorescence assay. The levels of expression were quantitated and localization of the protein constituents was assessed by means of confocal scanning laser microscopy. Our studies showed that, although the embryos grew in culture, vimentin could not be detected in a filamentous organization. Immunofluorescence for cytokeratins was only positive from the 8-cell stage onwards. In the morula stage an increased level of cytokeratin expression was observed with a transitional staining pattern, combining a filamentous and a diffuse occurrence. In the blastocyst stages profound cytokeratin filaments were seen in trophoblast cells but not in the inner cell mass. When the cytokeratin subtypes were analysed separately, it became apparent that expression levels of cytokeratins 8 and 18 increased gradually up to a filamentous pattern in the blastocyst stage. Cytokeratins 7 and 19, although elevated in the latter stage and showing a filamentous distribution, were not found as prominently as cytokeratins 8 and 18. A-type as well as B-type lamins could be detected in all developmental stages examined, as a faintly reactive nuclear lamina. In blastocysts both lamin types were detected in trophoblast as well as in inner cell mass.
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Coonen, E., Dumoulin, J.C.M. & Ramaekers, F.C.S. Intermediate filament protein expression in early developmental stages of the mouse. Histochemistry 99, 141–149 (1993). https://doi.org/10.1007/BF00571875
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DOI: https://doi.org/10.1007/BF00571875