Age-related changes in the expression of cytokeratin and vimentin in human choroid plexus.

Using immunohistochemical methods the expression of intermediate filaments in fetal and adult human choroid plexus epithelium was investigated. The results indicate that the full expression of cytokeratin and vimentin was seen at the 22nd gestational week corresponding to the onset of liquor production. In neural tube and crest cells of human embryos no cytokeratins were detectable, whereas vimentin could be demonstrated in early stages.