Persistent Sodium Current Mediates the Steep Voltage Dependence of Spatial Coding in Hippocampal Pyramidal Neurons.
Persistent Sodium Current Mediates the Steep Voltage Dependence of Spatial Coding in Hippocampal Pyramidal Neurons.
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DOI:
10.1016/j.neuron.2018.05.025
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发表时间:
2018-07-11
期刊:
影响因子:
16.2
通讯作者:
Spruston N
中科院分区:
文献类型:
--
作者:
Hsu CL;Zhao X;Milstein AD;Spruston N
The mammalian hippocampus forms a cognitive map using neurons that fire according to an animal’s position (‘place cells’) and many other behavioral and cognitive variables. The responses of these neurons are shaped by their presynaptic inputs and the nature of their postsynaptic integration. In CA1 pyramidal neurons, spatial responses in vivo exhibit a strikingly supralinear dependence on baseline membrane potential. The biophysical mechanisms underlying this nonlinear cellular computation are unknown. Here, through a combination of in-vitro, in-vivo, and in-silico approaches, we show that persistent sodium current mediates the strong membrane-potential dependence of place-cell activity. This current operates at membrane potentials below action potential threshold and over seconds-long timescales, mediating powerful—and rapidly reversible—amplification of synaptic responses, which drive place-cell firing. Thus, we identify a biophysical mechanism that shapes the coding properties of neurons composing the hippocampal cognitive map. The hippocampus encodes experience using ‘place cells’. Hsu et al. show that their firing is rapidly and reversibly regulated by small changes in membrane-potential through persistent sodium current, thus providing a biophysical mechanism by which behavior can influence place-cell firing.
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