期刊
NEURON
卷 80, 期 1, 页码 72-79出版社
CELL PRESS
DOI: 10.1016/j.neuron.2013.07.020
关键词
-
资金
- National Institutes of Health [NS045711, HD052731, HD056370, MH085617]
- Emory Neuroscience NINDS [P30NS055077]
A novel experience induces the Arc/Arg3.1 gene as well as plasticity of CA1 neural networks. To understand how these are linked, we briefly exposed GFP reporter mice of Arc transcription to a novel environment. Excitatory synaptic function of CA1 neurons with recent in vivo Arc induction (ArcGFP+) was similar to neighboring noninduced neurons. However, in response to group 1 metabotropic glutamate receptor (mGluR) activation, ArcGFP+ neurons preferentially displayed long-term synaptic depression (mGluR-LTD) and robust increases in dendritic Arc protein. mGluR-LTD in ArcGFP+ neurons required rapid protein synthesis and Arc, suggesting that dendritic translation of Arc underlies the priming of mGluR-LTD. In support of this idea, novelty exposure increased Arc messenger RNA in CA1 dendrites and promoted mGluR-induced translation of Arc in hippocannpal synaptoneurosomes. Repeated experience suppressed synaptic transmission onto ArcGFP+ neurons and occluded mGluR-LTD ex vivo. mGluR-LTD priming in neurons with similar Arc activation history may contribute to encoding a novel environment.
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