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The Journal of Neuroscience, September 15, 1999, 19(18):7781-7792
Alternative Splicing of the C-Terminal Domain Regulates Cell
Surface Expression of the NMDA Receptor NR1 Subunit
Shigeo
Okabe1, 2,
Akiko
Miwa3, and
Haruo
Okado3
1 Laboratory of Molecular Neurobiology, National
Institute of Bioscience and Human Technology, Tsukuba, Ibaraki
305-8566, Japan, 2 Department of Anatomy and Cell Biology,
School of Medicine, Tokyo Medical and Dental University, Bunkyo-ku,
Tokyo, 113-8519, Japan, and 3 Department of Neurobiology,
Tokyo Metropolitan Institute for Neuroscience, Fuchu, Tokyo 183-8526,
Japan
Subcellular localization of the NMDA receptor NR1 splice forms was
studied by expressing individual splice variants and their epitope-tagged derivatives in mouse fibroblasts and in hippocampal neurons. When NR1 splice variants were expressed in fibroblasts, the
amount of NR1 molecules expressed on the cell surface varied among
forms with different C-terminal cytoplasmic domains. The splice forms
with the longest C-terminal cytoplasmic tail (NR1-1a and NR1-1b)
showed the lowest amount of cell surface expression, and the splice
forms with the shortest C-terminal cytoplasmic tail (NR1-4a and
NR1-4b) showed the highest cell surface expression. Cell surface
expression of NR1 was enhanced by the coexpression of the NR2 subunit.
We measured the glutamate-induced increase of calcium concentration in
fibroblasts expressing one of the NR1 splice forms and the NR2B
subunit. The increase of calcium concentration after glutamate
application had a positive correlation with the amount of NR1 splice
forms expressed on the cell surface. When epitope-tagged NR1 splice
variants were expressed in primary hippocampal neurons using
recombinant adenoviruses, we also observed the differential expression
on the cell surface between splice variants. These results suggest that
the splicing of the C-terminal domain of the NR1 subunit regulates the
cell surface expression of the functional NMDA receptors.
Key words:
NMDA receptor; alternative splicing; fluorescent antibody
technique; calcium imaging; membrane proteins; neurons
Copyright © 1999 Society for Neuroscience 0270-6474/99/19187781-12$05.00/0
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