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(Received for publication, July 29, 1996, and in revised form, November 1, 1996)
From the Molecular Neurobiology Unit, Gerontology Research Center,
NIA, National Institutes of Health, Baltimore, Maryland 21224
The N-methyl-D-aspartate
(NMDA) subtype of glutamate receptor plays important roles in synaptic
plasticity, the induction of long term potentiation, and
excitotoxicity. Mechanisms governing the regulation of expression of
its subunit genes remain largely unknown. The promoter of the essential
subunit of the NMDA receptor heteromer, NMDAR1, contains DNA binding
elements recognized by the nerve growth factor-inducible/early growth
reaction factor (NGFI/Egr) family of transcription factors that are
rapidly induced by neurotrophins, such as nerve growth factor (NGF).
This study examined the effect of NGF on the activity of the
N-methyl-D-aspartate receptor subunit 1 (NMDAR1) promoter/luciferase reporter constructs in PC12 cells, which
contain the high affinity TrkA receptor for NGF and the low affinity
p75NTR receptor for neurotrophins. NGF up-regulated the
activity of the NMDAR1 promoter by 3-4-fold in a time- and
dose-dependent manner. 5
Volume 272, Number 9,
Issue of February 28, 1997
pp. 5936-5942
©1997 by The American Society for Biochemistry and Molecular Biology, Inc.
deletional analysis of the
promoter indicated that the responsive element(s) resides in the
proximal region containing GSG and Sp1 sites. Mutational analysis of
these sites revealed that both were important for NGF regulation.
Transient expression of Egr-1 increased activity of the wild type
promoter but failed to increase activity of a GSG mutant promoter.
Other neurotrophins did not activate the promoter, while K-252a
inhibited the action of NGF. These results suggest that the NGF effect
is mediated by the high affinity NGF receptor, Trk A and that
neurotrophin binding to the low affinity neurotrophin receptor,
p75NTR, alone does not affect the promoter activity. Our
results suggest that NGF is able to up-regulate the activity of the
NMDAR1 promoter and may play a role in controlling the expression
levels of NMDA receptors.
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