Axon initial segment structural plasticity in animal models of genetic and acquired epilepsy

Rosemary C. Harty, Tae Hwan Kim, Evan A. Thomas, Lisa Cardamone, Nigel C. Jones, Steven Petrou, Verena C. Wimmer

Research output: Contribution to journalArticleResearchpeer-review

31 Citations (Scopus)

Abstract

A novel form of neuronal plasticity, occurring at the axon initial segment (AIS), has recently been described. Lengthening of the AIS and movement away from the soma are consequences of changes in neuronal input and result in alterations in neuronal excitability. We hypothesised that AIS plasticity may play a role in epilepsy, due to chronic changes in neuronal activity. Immunohistochemistry and confocal microscopy were used to analyse AIS length and position in pyramidal neurons in deep layer 5 of the somatosensory cortex from 5 mice with genetic epilepsy and 4 controls, and from 3 rats subjected to amygdala kindling and 3 controls. The effect of a subtle alteration of AIS position was modelled computationally.We identified a difference in the position of the AIS in animals with seizures: in mice the AIS was positioned 0.2. μm further away from the soma, and in rats the AIS was positioned 0.6. μm closer to the soma compared with controls. Computational modelling indicated that a subtle alteration in AIS position could result in a change in action potential firing threshold.The identification of AIS plasticity in animal models of epilepsy is significant in furthering our understanding of the pathophysiological mechanisms involved in this disorder.

Original languageEnglish
Pages (from-to)272-279
Number of pages8
JournalEpilepsy Research
Volume105
Issue number3
DOIs
Publication statusPublished - Aug 2013
Externally publishedYes

Keywords

  • Amygdala kindling
  • Axon initial segment
  • Childhood absence epilepsy
  • Epilepsy
  • Seizure
  • Structural neuronal plasticity

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