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Updated: May 10, 2026

Inducing Long-Term Plasticity of Intrinsic Neuronal Excitability in Neurons of the Dorsal Lateral Geniculate Nucleus
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Inducing Long-Term Plasticity of Intrinsic Neuronal Excitability in Neurons of the Dorsal Lateral Geniculate Nucleus

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Homeostatic synaptic plasticity in developing spinal networks driven by excitatory GABAergic currents.

Peter Wenner1

  • 1Emory University, School of Medicine, 615 Michael Street, Rm 601, Physiology Department, Atlanta, GA 30322, United States.

Neuropharmacology
|June 4, 2013
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Summary

Homeostatic plasticity mechanisms maintain neural activity levels. In chick embryos, altered GABAergic signaling triggers compensatory changes in AMPA receptors and GABAergic currents, revealing developmental plasticity.

Keywords:
Chick embryoMotoneuronNetwork activity

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Published on: November 14, 2014

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Synaptic Plasticity

Background:

  • Homeostatic plasticity stabilizes neural network activity through compensatory changes.
  • Typically studied when GABAergic signaling is inhibitory, its role during excitatory GABAergic phases is less understood.
  • The chick embryo spinal cord offers a model for studying plasticity when GABA acts as an excitatory neurotransmitter.

Purpose of the Study:

  • To investigate homeostatic plasticity in the chick embryo spinal cord during a developmental stage where GABA is excitatory.
  • To identify the signaling pathways and molecular players involved in this early form of plasticity.
  • To compare findings with other developmental stages and systems where GABAergic signaling differs.

Main Methods:

  • In vivo perturbation of spinal activity in living chick embryos.
  • Analysis of compensatory changes in postsynaptic AMPA receptors.
  • Measurement of driving force alterations in GABAergic currents.
  • Comparison with different developmental stages and the developing retina.

Main Results:

  • Perturbing spinal activity induced compensatory changes in postsynaptic AMPA receptors.
  • The driving force for GABAergic currents also showed compensatory adjustments.
  • Reduced GABAA receptor signaling was identified as a potential trigger for these homeostatic changes.
  • These plasticity mechanisms differ from those observed in later developmental stages.

Conclusions:

  • Homeostatic plasticity is actively expressed in the developing chick embryo spinal cord even when GABAergic signaling is excitatory.
  • Reduced GABAA receptor signaling acts as a crucial sensor for initiating homeostatic plasticity.
  • These findings highlight the dynamic nature of neural development and the diverse strategies employed for activity homeostasis.