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The Journal of Neuroscience, June 1, 2001, 21(11):3771-3779
Metabotropic Glutamate Receptor Subtypes 1 and 5 Are Activators
of Extracellular Signal-Regulated Kinase Signaling Required for
Inflammatory Pain in Mice
Farzana
Karim,
Chia-Chuan
Wang, and
Robert W.
Gereau IV
Division of Neuroscience, Baylor College of Medicine, Houston,
Texas 77030
Metabotropic glutamate receptors are expressed abundantly in the
spinal cord and have been shown to play important roles in the
modulation of nociceptive transmission and plasticity. Most previous
studies have focused on the group I metabotropic glutamate receptors (mGluR1 and mGluR5) and activation of phospholipase C
signaling by these receptors in modulating nociception. Recently, it
was shown that the extracellular signal-regulated kinases
(ERKs)/mitogen-activated protein kinases are activated in spinal
cord dorsal horn neurons in response to stimulation of nociceptors and
that ERK signaling is involved in nociceptive plasticity. In the
present studies, we sought to test the hypothesis that group I mGluRs
modulate nociceptive transmission or plasticity via modulation of ERK
signaling in dorsal horn neurons. We show that activation of mGluR1 and mGluR5 leads to activation of ERK1 and ERK2 in the spinal cord. Furthermore, we find that inflammation-evoked ERK activation, which is
required for nociceptive plasticity, is downstream of mGluR1 and
mGluR5. Finally, we show colocalization of group I mGluRs with
activated ERK in dorsal horn neurons. These results show that mGluR1
and mGluR5 are activated in dorsal horn neurons in response to
peripheral inflammation and that activation of these group I mGluRs
leads to activation of ERK1 and ERK2, resulting in enhanced pain sensitivity.
Key words:
extracellular signal-regulated kinases (ERKs); mitogen-activated protein kinase (MAPK); nociception; formalin test; spinal cord; dorsal horn
Copyright © 2001 Society for Neuroscience 0270-6474/01/21113771-09$05.00/0
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