Human neuroepithelial cells express NMDA receptors.
L-glutamate, an excitatory neurotransmitter, binds to both ionotropic and metabotropic glutamate receptors. In certain parts of the brain the BBB contains two normally impermeable barriers: 1) cerebral endothelial barrier and 2) cerebral epithelial barrier. Human cerebral endothelial cells express NMDA receptors; however, to date, human cerebral epithelial cells (neuroepithelial cells) have not been shown to express NMDA receptor message or protein. In this study, human hypothalamic sections were examined for NMDA receptors (NMDAR) expression via immunohistochemistry and murine neuroepithelial cell line (V1) were examined for NMDAR via RT-PCR and Western analysis. We found that human cerebral epithelium express protein and cultured mouse neuroepithelial cells express both mRNA and protein for the NMDA receptor. These findings may have important consequences for neuroepithelial responses during excitotoxicity and in disease.
Sharp
Christopher D
CD
Department of Molecular and Cellular Physiology, LSU Health Sciences Center, Shreveport, LA, USA. csharp@lsuhsc.edu
Fowler
M
M
Jackson
T H
TH
Houghton
J
J
Warren
A
A
Nanda
A
A
Chandler
I
I
Cappell
B
B
Long
A
A
Minagar
A
A
Alexander
J S
JS
D000818:Animals; D001812:Blood-Brain Barrier / Q000378:metabolism; D015153:Blotting, Western; D001921:Brain / Q000098:blood supply / Q000166:cytology / Q000378:metabolism*; D002478:Cells, Cultured; D004591:Electrophoresis, Polyacrylamide Gel; D004847:Epithelial Cells / Q000166:cytology / Q000378:metabolism*; D006801:Humans; D007031:Hypothalamus / Q000098:blood supply / Q000166:cytology / Q000378:metabolism; D007150:Immunohistochemistry; D051379:Mice; D012333:RNA, Messenger / Q000096:biosynthesis; D016194:Receptors, N-Methyl-D-Aspartate / Q000096:biosynthesis* / Q000235:genetics; D020133:Reverse Transcriptase Polymerase Chain Reaction
D012333:RNA, Messenger; D016194:Receptors, N-Methyl-D-Aspartate; C121001:NR2B NMDA receptor