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Related Experiment Videos

Experience-dependent changes in intracellular Cl- regulation in developing auditory neurons.

Shumei Shibata1, Yasuhiro Kakazu, Akihito Okabe

  • 1Department of Cellular and System Physiology, Graduate School of Medical Sciences, Kyushu University, Fukuoka 812-8582, Japan.

Neuroscience Research
|January 27, 2004
PubMed
Summary

Neuronal activity, including GABAergic, glycinergic, and glutamatergic inputs, is crucial for the developmental decrease in intracellular chloride concentration ([Cl-](i)) in rat lateral superior olive neurons. This activity regulates chloride homeostasis and KCC2 expression.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Cellular Physiology

Background:

  • GABA and glycine responses shift from depolarization to hyperpolarization during CNS development.
  • This shift is attributed to a decrease in intracellular chloride concentration ([Cl-](i)).

Purpose of the Study:

  • To investigate the factors influencing the developmental decrease in [Cl-](i) in rat lateral superior olive (LSO) neurons.
  • To determine the role of neuronal activity in regulating intracellular chloride levels and KCC2 expression in LSO neurons.

Main Methods:

  • Patch-clamp recordings of glycine-gated chloride currents in isolated rat LSO neurons.
  • Measurement of intracellular chloride concentration ([Cl-](i)) using fluorescence.
  • Analysis of K+-Cl- cotransporter 2 (KCC2) mRNA expression.

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Main Results:

  • Neurons from rats with cochlear ablations before hearing onset showed no developmental decrease in [Cl-](i).
  • Strychnine pellet implantation also prevented the decrease in [Cl-](i) in most neurons.
  • High [Cl-](i) was associated with a lack of KCC2 mRNA expression in some neurons.

Conclusions:

  • The developmental decrease in [Cl-](i) in LSO neurons is dependent on neuronal activity.
  • Both GABAergic/glycinergic and glutamatergic afferent activity contribute to the maturation of chloride regulatory mechanisms.
  • Neuronal activity influences KCC2 expression, impacting chloride homeostasis.