Dynamic zinc pools in mouse choroid plexus.
We examined the presence of Zn-transporters (ZnT1, ZnT3, ZnT4, and ZnT6) proteins and zinc ions in rat choroid epithelium with immunohistochemistry and zinc selenide autometallography (ZnSe(AMG)). The four ZnT proteins were all expressed in the choroid epithelial cells. ZnT3 immunostaining was found in vesicle membranes in the apical part of the cells, associated to the microvillus membrane. Correspondingly, the ZnSe(AMG) technique revealed zinc ions in small vesicles, in microvilli, and multivesicular bodies in the epithelial cells. Traceable zinc ions were also found in lysosome-like organelles of fenestrated endothelial cells, but here no corresponding ZnT3 immunostaining was seen. The observations suggests that the choroid plexus is instrumental to regulation of the level of zinc ions in the cerebrospinal fluid.
Wang
Zhan-You
ZY
Department of Neurobiology, Institute of Anatomy, University of Aarhus, DK-8000 Aarhus C, Denmark.
Stoltenberg
Meredin
M
Jo
Seung Mook
SM
Huang
Liping
L
Larsen
Agnete
A
Dahlström
Annica
A
Danscher
Gorm
G
D000818:Animals; D002352:Carrier Proteins / Q000032:analysis* / Q000378:metabolism; D002831:Choroid Plexus / Q000737:chemistry* / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D015032:Zinc / Q000032:analysis* / Q000378:metabolism
D002352:Carrier Proteins; C017800:zinc-binding protein; D015032:Zinc