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Related Experiment Videos

Layer-specific properties of the persistent sodium current in sensorimotor cortex.

P Aracri1, E Colombo, M Mantegazza

  • 1C. Besta National Neurological Institute, Via Celoria 11, 20133 Milan, Italy.

Journal of Neurophysiology
|February 10, 2006
PubMed
Summary

Persistent sodium current (I(NaP)) characteristics differ between rat sensorimotor cortex layers. Layer V neurons exhibit higher I(NaP) density and slower inactivation, influencing burst firing and epilepsy susceptibility.

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Area of Science:

  • Neuroscience
  • Electrophysiology
  • Cortical Circuitry

Background:

  • The persistent sodium current (I(NaP)) plays a crucial role in neuronal excitability and firing patterns.
  • Understanding layer-specific differences in I(NaP) is essential for comprehending cortical function and dysfunction.

Purpose of the Study:

  • To characterize and compare the electrophysiological properties of I(NaP) in pyramidal neurons of layers II/III and V in the rat sensorimotor cortex.
  • To investigate the functional implications of I(NaP) differences for neuronal firing and susceptibility to network hyperexcitability.

Main Methods:

  • Whole-cell patch-clamp recordings were performed on rat sensorimotor cortex slices.
  • I(NaP) activation, inactivation, and recovery kinetics were analyzed in layer II/III and layer V pyramidal neurons.

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Main Results:

  • I(NaP) activated around -60 mV and half-activated at -43 mV in both layers.
  • Layer V neurons showed significantly higher I(NaP) peak amplitude and density compared to layer II/III neurons.
  • Voltage-dependent inactivation of I(NaP) was shifted to more positive potentials in layer V, and its inactivation kinetics were significantly slower.
  • A non-inactivating fraction of I(NaP) (approx. 25%) was observed in both layers.

Conclusions:

  • I(NaP) exhibits distinct properties in layer V versus layer II/III pyramidal neurons, including higher density, rightward-shifted inactivation, and slower inactivation kinetics in layer V.
  • These layer-specific I(NaP) characteristics may contribute to the propensity of layer V neurons to generate burst firing and increase susceptibility to epileptic events.