Abstract
In central neurons, the second messenger cGMP is believed to induce long-term changes in efficacy at glutamatergic synapses through activation of protein kinase G (PKG). Stimulating nitric oxide synthase, activating soluble guanylyl cyclase or elevating concentrations of intracellular cGMP depressed excitatory synaptic transmission in CA1 hippocampal neurons. Unexpectedly, intracellular cGMP depressed responses of AMPA receptors and inhibited excitatory postsynaptic currents in hippocampal neurons independently of phosphorylation. Our findings demonstrate that cGMP's modulation of excitatory transmission may involve a coupling of AMPA channel activity to levels of cGMP.
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Acknowledgements
We thank Y.-T. Wang, M. W. Salter and L.-Y. Wang for comments on this manuscript. We thank K. W. Yau for the gifts of KY9 and KY8. Supported by the Medical Research Council of Canada and the Ontario Neurotrauma Foundation. S.L. and M.J. are fellows of the Ontario Neurotrauma Foundation and NSERC, respectively.
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Lei, S., Jackson, M., Jia, Z. et al. Cyclic GMP-dependent feedback inhibition of AMPA receptors is independent of PKG. Nat Neurosci 3, 559–565 (2000). https://doi.org/10.1038/75729
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DOI: https://doi.org/10.1038/75729
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