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The Journal of Neuroscience, April 1, 1998, 18(7):2475-2485
Multiple Signaling Pathways Regulate Cell Surface Expression and
Activity of the Excitatory Amino Acid Carrier 1 Subtype of Glu
Transporter in C6 Glioma
Karen E.
Davis1,
Dean
J.
Straff3,
Edward A.
Weinstein2,
Peter G.
Bannerman3,
Dana M.
Correale3,
Jeffrey D.
Rothstein4, and
Michael B.
Robinson2, 3
Departments of 1 Neuroscience,
2 Pharmacology, and 3 Pediatrics, Children's
Hospital of Philadelphia, Children's Seashore House, University of
Pennsylvania, Philadelphia, Pennsylvania 19104, and
4 Department of Neurology, The Johns Hopkins University,
Baltimore, Maryland 21287
Neuronal and glial sodium-dependent transporters are crucial for
the control of extracellular glutamate levels in the CNS. The
regulation of these transporters is relatively unexplored, but the
activity of other transporters is regulated by protein kinase C (PKC)-
and phosphatidylinositol 3-kinase (PI3K)-mediated trafficking to and
from the cell surface. In the present study the C6 glioma cell line was
used as a model system that endogenously expresses the excitatory amino
acid carrier 1 (EAAC1) subtype of neuronal glutamate transporter. As
previously observed, phorbol 12-myristate 13-acetate (PMA) caused an
80% increase in transporter activity within minutes that cannot be
attributed to the synthesis of new transporters. This increase in
activity correlated with an increase in cell surface expression of
EAAC1 as measured by using a membrane-impermeant biotinylation reagent.
Both effects of PMA were blocked by the PKC inhibitor
bisindolylmaleimide II (Bis II). The putative PI3K inhibitor,
wortmannin, decreased L-[3H]-glutamate
uptake activity by >50% within minutes. Wortmannin decreased the
Vmax of
L-[3H]-glutamate and
D-[3H]-aspartate transport, but it did
not affect Na+-dependent
[3H]-glycine transport. Wortmannin also decreased
cell surface expression of EAAC1. Although wortmannin did not block the
effects of PMA on activity, it prevented the PMA-induced increase in
cell surface expression. This trafficking of EAAC1 also was examined
with immunofluorescent confocal microscopy, which supported the
biotinylation studies and also revealed a clustering of EAAC1 at cell
surface after treatment with PMA. These studies suggest that the
trafficking of the neuronal glutamate transporter EAAC1 is regulated by
two independent signaling pathways and also may suggest a novel
endogenous protective mechanism to limit glutamate-induced
excitotoxicity.
Key words:
glutamate transport; EAAC1; excitatory amino acid; protein kinase C; phosphatidylinositol 3-kinase; trafficking; C6
glioma
Copyright © 1998 Society for Neuroscience 0270-6474/98/1872475-11$05.00/0
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