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The Journal of Neuroscience, November 15, 2002, 22(22):9679-9686
Two Distinct Signaling Pathways Upregulate NMDA Receptor Responses via Two Distinct Metabotropic Glutamate Receptor Subtypes
Pascal Benquet, Christine E. Gee, and Urs Gerber Brain Research Institute, University of Zurich, CH-8057 Zurich, Switzerland
Molecular processes regulating the gain of NMDA receptors modulate diverse physiological and pathological responses in the CNS. Group I metabotropic glutamate receptors (mGluRs), which neighbor NMDA receptors and which can be coactivated by synaptically released glutamate, couple to several different second messenger pathways, each of which could target NMDA receptors. In CA3 pyramidal cells we show that the activation of mGluR1 potentiates NMDA current via a G-protein-independent mechanism involving Src kinase activation. In contrast, mGluR5-mediated enhancement of NMDA current requires G-protein activation, triggering a signaling cascade including protein kinase C and Src. These results indicate that one neurotransmitter, glutamate, can activate two distinct and independent signaling systems to target the same effector. These two pathways are likely to contribute significantly to the highly differentiated control of NMDA receptor function.
Key words: mGluR1; mGluR5; Src tyrosine kinase; PKC; G-protein-independent signaling; potentiation; hippocampus
Copyright © 2002 Society for Neuroscience 0270-6474/02/22229679-08$05.00/0
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