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The developing neuroepithelium in human embryonic and fetal brain studied with vimentin-immunocytochemistry

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Summary

The neuroepithelial cells, which constitute the primordium of the CNS, are potentially capable of generating neuronal and glial cell lineages concomitantly. The appearance and morphological development of vimentin-positive neuroepithelial cells in human embryonic and fetal brain (4–16 weeks) were studied with immunocytochemistry. In embryos aged 4–6 weeks, vimentin-reactivity was seen in all neuroepithelial cells, including those which exhibited mitotic figures. The distribution of reactivity changed according to a general developmental pattern, which commenced and proceeded temporally different in various regions of the CNS. All regions exhibited vimentin-positive neuroepithelial cells, the distribution and morphology of which gradually changed, resulting in lamination of the neural wall into two and subsequently three layers. The neocortex and midline raphe were the only regions to differ significantly from the general pattern. When reactivity to glial fibrillary acidic protein developed at 7–8 weeks, the distribution was very much like that of vimentin at the same stage. Reactivity to glial, neuronal and other cellular markers (S-100, neurofilament, neuron specific enolase, desmin, and cytokeratin) revealed different distributions. Although cells retaining vimentin beyond the ventricular zone stage are radial glial cells and presumptive fibrous astrocytes, it seems unlikely that vimentin is a marker for a distinct cell lineage during early CNS development. It is suggested that all neuroepithelial cells in vivo differentiate to a stage where they express vimentin, and that vimentin may have a functional role in cellular movements and during the interkinetic nuclear migration.

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Stagaard, M., Møllgård, K. The developing neuroepithelium in human embryonic and fetal brain studied with vimentin-immunocytochemistry. Anat Embryol 180, 17–28 (1989). https://doi.org/10.1007/BF00321896

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