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Chloride Homeostasis in Developing Motoneurons.

Pascal Branchereau1, Daniel Cattaert2

  • 1Institut de Neurosciences Cognitives et Intégratives d'Aquitaine (INCIA), Univ. Bordeaux, UMR 5287, CNRS, Bordeaux, France. pascal.branchereau@u-bordeaux.fr.

Advances in Neurobiology
|September 6, 2022
PubMed
Summary

The balance between excitation and inhibition relies on GABA/Glycine chloride-mediated synaptic inhibition maturation. This study challenges the typical model of chloride homeostasis in motoneurons, suggesting early alterations may link to pathology.

Keywords:
ALS diseaseChloride co-transporters (CCCs)GABA/glycineInhibitory synaptic eventsKCC2ModellingNKCC1Patch-clampSOD1G93A mouse; time courseSpinal cord motoneuron

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cellular Physiology

Background:

  • Maturation of GABA/Glycine chloride-mediated synaptic inhibition is vital for neural excitation-inhibition balance.
  • Immature neurons typically exhibit excitatory GABA/Glycine activity due to high intracellular chloride ([Cl-]i).
  • Developmentally, a decrease in [Cl-]i establishes inhibitory synaptic activity.

Purpose of the Study:

  • To investigate the role of cation-chloride cotransporters in neuronal chloride homeostasis.
  • To examine the expression patterns of KCC2 and NKCC1 in motoneurons during development.
  • To challenge the classical model of chloride homeostasis in the context of motoneurons.

Main Methods:

  • Analysis of cation-chloride cotransporter expression (KCC2 and NKCC1).
  • Measurement of intracellular chloride ([Cl-]i) levels.
  • Comparative study between cortical/hippocampal networks and motoneurons.

Main Results:

  • The classical model of cotransporter expression (high NKCC1/low KCC2 in immature neurons) does not hold true for motoneurons.
  • Motoneurons may exhibit altered chloride homeostasis early in development.
  • This early alteration in chloride homeostasis could be implicated in pathological conditions.

Conclusions:

  • The established model for chloride homeostasis via KCC2 and NKCC1 in cortical and hippocampal neurons is not applicable to motoneurons.
  • Dysregulation of chloride homeostasis in motoneurons during early development may contribute to neurological disorders.
  • Further research is needed to elucidate the specific mechanisms and pathological consequences of altered chloride homeostasis in motoneurons.