Abstract
The N-methyl-D-aspartate (NMDA) receptor contributes to synaptic plasticity in the central nervous system and is both serine-threonine and tyrosine phosphorylated. In CA1 pyramidal neurons of the hippocampus, activators of protein kinase C (PKC) as well as the G-protein-coupled receptor ligands muscarine and lysophosphatidic acid enhanced NMDA-evoked currents. Unexpectedly, this effect was blocked by inhibitors of tyrosine kinases, including a Src required sequence and an antibody selective for Src itself. In neurons from mice lacking c-Src, PKC-dependent upregulation was absent. Thus, G-protein-coupled receptors can regulate NMDA receptor function indirectly through a PKC-dependent activation of the non-receptor tyrosine kinase (Src) signaling cascade.
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Acknowledgements
We thank M.W. Salter, S. Courtneidge and J. Roder for reagents and knockout mice. We thank M.W. Salter for assistance with the design of some of the experiments. We also thank X-M. Yu and L-Y. Wang for discussions. This work was supported by grants from the MRC of Canada. W-Y.L., Z-G.X. and S.L. are fellows of the Heart & Stroke, the MRC and the Ontario Neurotrauma Fnd., respectively.
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Lu, WY., Xiong, ZG., Lei, S. et al. G-protein-coupled receptors act via protein kinase C and Src to regulate NMDA receptors. Nat Neurosci 2, 331–338 (1999). https://doi.org/10.1038/7243
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DOI: https://doi.org/10.1038/7243
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