Transporters, Ion Channels, and Junctional Proteins in Choroid Plexus Epithelial Cells
2024
Masaki Ueno | Yoichi Chiba | Ryuta Murakami | Yumi Miyai | Koichi Matsumoto | Keiji Wakamatsu | Toshitaka Nakagawa | Genta Takebayashi | Naoya Uemura | Ken Yanase | Yuichi Ogino
The choroid plexus (CP) plays significant roles in secreting cerebrospinal fluid (CSF) and forming circadian rhythms. A monolayer of epithelial cells with tight and adherens junctions of CP forms the blood–CSF barrier to control the movement of substances between the blood and ventricles, as microvessels in the stroma of CP have fenestrations in endothelial cells. CP epithelial cells are equipped with several kinds of transporters and ion channels to transport nutrient substances and secrete CSF. In addition, junctional components also contribute to CSF production as well as blood–CSF barrier formation. However, it remains unclear how junctional components as well as transporters and ion channels contribute to the pathogenesis of neurodegenerative disorders. In this manuscript, recent findings regarding the distribution and significance of transporters, ion channels, and junctional proteins in CP epithelial cells are introduced, and how changes in expression of their epithelial proteins contribute to the pathophysiology of brain disorders are reviewed.
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