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Persistent sodium current modulates axonal excitability in CA1 pyramidal neurons.

Peter Müller1, Andreas Draguhn1, Alexei V Egorov1

  • 1Department of Neurophysiology, Institute of Physiology and Pathophysiology, Heidelberg University, Heidelberg, Germany.

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|June 5, 2018
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Summary

Persistent sodium currents (INaP) regulate ectopic action potential generation in mouse hippocampal axons. These currents are direction-selective, impacting neuronal signaling in physiological and pathological states.

Keywords:
axonectopic action potentialhippocampal slicepersistent sodium currentphenytoinriluzole

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Area of Science:

  • Neuroscience
  • Cellular Neuroscience
  • Neurophysiology

Background:

  • Axonal excitability is crucial for neuronal signaling accuracy, direction, and velocity.
  • Persistent sodium current (INaP) plays a role in spike generation and transmitter release.
  • Ectopic action potentials can arise in axons during physiological or pathological conditions.

Purpose of the Study:

  • To investigate the regulation of ectopic axonal excitability by INaP in mouse hippocampal CA1 pyramidal neurons.
  • To determine the role of INaP in the generation of ectopic action potentials along axonal fibers.

Main Methods:

  • Field potential and intracellular voltage recordings in mouse brain slices.
  • Electrically evoked antidromic spikes were analyzed.
  • Pharmacological blockade of INaP using riluzole and phenytoin.

Main Results:

  • INaP blockers (riluzole, phenytoin) suppressed electrically evoked antidromic spikes.
  • The effect was mediated by reduced probability of ectopic spike generation, with unaffected latency.
  • INaP contribution to excitability was direction-selective, greater in branches toward the entorhinal cortex.

Conclusions:

  • Distal CA1 pyramidal cell axon excitability is modulated by INaP in a direction-selective manner.
  • This mechanism is significant for ectopic spike generation in oscillating networks and pathological states like demyelination.