Molecular identity of dendritic voltage-gated sodium channels.

Molecular identity of dendritic voltage-gated sodium channels.
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DOI:
10.1126/science.1187958
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发表时间:
2010-05-14
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Nusser Z
Nusser Z
中科院分区:
其他
文献类型:
--
作者:
Lorincz A;Nusser Z

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Active invasion of the dendritic tree by action potentials (APs) generated in the axon is essential for associative synaptic plasticity and neuronal ensemble formation. In cortical pyramidal cells (PCs) this AP backpropagation is supported by dendritic voltage-gated Na+ channels (Nav), whose molecular identity is unknown. Using a highly sensitive electron microscopic immunogold technique, we reveal the presence of the Nav1.6 subunit in hippocampal CA1 PC proximal and distal dendrites. Here the subunit density is lower by a factor of 35 to 80 than that found in axon initial segments. A gradual decrease in Nav1.6 density along the proximodistal axis of the dendritic tree was also detected without any labeling in dendritic spines. Our results reveal the characteristic subcellular distribution of the Nav1.6 subunit, identifying this molecule as a key substrate enabling dendritic excitability.
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