PMID: 93719Sep 1, 1979Paper

Immunohistochemical evidence for an intracellular localization of plasma proteins in human foetal choroid plexus and brain

Neuroscience Letters
K MøllgårdN R Saunders


The intracellular distribution of plasma proteins in human foetal choroid plexus and brain was investigated by immunohistochemistry. Small groups of cells or single scattered cells in the epithelial layer of the choroid plexus exhibited positive staining for alpha-fetoprotein, albumin and transferrin, whereas prealbumin was found in the majority of the epithelial cells. Numerous nerve cells in the cerebral wall and in various brain stem nuclei were positively stained for alpha-fetoprotein, albumin and prealbumin. All appropriate controls were negative. The presence of plasma proteins within choroid plexus epithelial cells suggest that these proteins are transported from blood to CSF by a transcellular route across the choroid plexus epithelium. The intracellular distribution of plasma proteins in developing neurons may indicate that these proteins play some important role in neuronal differentiation or development.


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