Abstract
Synaptic plasticity, the cellular correlate for learning and memory, involves signaling cascades in the dendritic spine. Extensive studies have shown that long-term potentiation (LTP) of the excitatory postsynaptic current (EPSC) through glutamate receptors is induced by activation of N-methyl-D-asparate receptor (NMDA-R)--the coincidence detector--and Ca(2+)/calmodulin-dependent protein kinase II (CaMKII). Here we report that the same signaling pathway in the postsynaptic CA1 pyramidal neuron also causes LTP of the slow inhibitory postsynaptic current (sIPSC) mediated by metabotropic GABA(B) receptors (GABA(B)-Rs) and G protein-activated inwardly rectifying K(+) (GIRK) channels, both residing in dendritic spines as well as shafts. Indicative of intriguing differences in the regulatory mechanisms for excitatory and inhibitory synaptic plasticity, LTP of sIPSC but not EPSC was abolished in mice lacking Nova-2, a neuronal-specific RNA binding protein that is an autoimmune target in paraneoplastic opsoclonus myoclonus ataxia (POMA) patients with latent cancer, reduced inhibitory control of movements, and dementia.
Publication types
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Research Support, N.I.H., Extramural
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Research Support, Non-U.S. Gov't
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Research Support, U.S. Gov't, P.H.S.
MeSH terms
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Animals
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Calcium-Calmodulin-Dependent Protein Kinase Type 2
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Calcium-Calmodulin-Dependent Protein Kinases / metabolism
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Cells, Cultured
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Dendritic Spines / drug effects
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Dendritic Spines / metabolism
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Electric Stimulation
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Excitatory Postsynaptic Potentials / drug effects
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Excitatory Postsynaptic Potentials / physiology*
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GABA Antagonists / pharmacology
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GABA-B Receptor Antagonists
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Hippocampus / metabolism*
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Long-Term Potentiation / drug effects
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Long-Term Potentiation / physiology*
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Mice
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Mice, Knockout
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Nerve Tissue Proteins / genetics
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Nerve Tissue Proteins / metabolism
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Neural Inhibition / drug effects
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Neural Inhibition / physiology*
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Neuro-Oncological Ventral Antigen
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Organ Culture Techniques
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Pyramidal Cells / drug effects
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Pyramidal Cells / metabolism*
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RNA-Binding Proteins / genetics
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RNA-Binding Proteins / metabolism
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Rats
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Rats, Sprague-Dawley
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Receptors, GABA-B / metabolism
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Signal Transduction / drug effects
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Signal Transduction / physiology
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Synapses / drug effects
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Synapses / metabolism
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Synaptic Transmission / drug effects
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Synaptic Transmission / physiology*
Substances
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GABA Antagonists
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GABA-B Receptor Antagonists
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NOVA2 protein, human
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Nerve Tissue Proteins
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Neuro-Oncological Ventral Antigen
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RNA-Binding Proteins
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Receptors, GABA-B
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Calcium-Calmodulin-Dependent Protein Kinase Type 2
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Calcium-Calmodulin-Dependent Protein Kinases