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Using an α-Bungarotoxin Binding Site Tag to Study GABA A Receptor Membrane Localization and Trafficking
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GluR- and TrkB-mediated maturation of GABA receptor function during the period of eye opening

Christian Henneberger1, René Jüttner, Sonja A Schmidt

  • 1Sensory and Developmental Physiology, Johannes Mueller Centre for Physiology, University Medicine (Charité), Tucholskystr. 2, D-10117 Berlin, Germany.

The European Journal of Neuroscience
|January 28, 2005
PubMed

Insights

Synapse maturation involves GABAergic inhibitory postsynaptic current (IPSC) shortening in developing neurons. N-methyl-D-aspartate receptor activity specifically controls this change, influencing GABA receptor subunit composition.

Area of Science:

  • Neuroscience
  • Developmental Biology
  • Synaptic Plasticity

Background:

  • Synapse maturation is characterized by changes in postsynaptic currents, driven by alterations in neurotransmitter receptor subunit composition.
  • GABAergic inhibitory postsynaptic currents (IPSCs) in superior colliculus neurons undergo significant shortening during postnatal development.

Purpose of the Study:

  • To investigate the developmental changes in GABAergic IPSC kinetics in superior colliculus neurons.
  • To determine the role of N-methyl-D-aspartate receptor (NMDAR) activity in regulating GABAergic synaptic current kinetics.
  • To explore the influence of brain-derived neurotrophic factor (BDNF) and metabotropic glutamate receptors (mGluRs) on this developmental process.

Main Methods:

  • Patch clamp electrophysiology to record IPSCs in developing neurons.
  • Quantitative analysis of IPSC kinetics (decay time).
  • Measurement of GABAAR alpha1 and alpha3 mRNA expression levels.
  • Pharmacological manipulation of NMDAR and Group I mGluR activity.
  • Experiments using BDNF knockout (bdnf-/-) mice.

Main Results:

  • GABAergic IPSCs significantly shortened from postnatal day 1 to 21, with the most rapid change occurring between postnatal days 12 and 15.
  • This shortening correlated with increased GABAAR alpha1 mRNA and decreased alpha3 mRNA expression, alongside enhanced sensitivity to zolpidem.
  • NMDAR activation accelerated IPSC decay, while NMDAR blockade slowed it, indicating NMDARs specifically control GABAergic kinetics.
  • BDNF absence led to a delayed increase in alpha1/alpha3 mRNA and IPSC shortening.
  • Group I mGluR blockade had no effect on IPSC kinetics.

Conclusions:

  • The developmental shortening of GABAergic IPSCs in superior colliculus neurons is primarily regulated by NMDAR activity.
  • The switch in GABAAR alpha subunit composition (alpha1/alpha3) is a key mechanism underlying the observed changes in synaptic current kinetics.
  • This regulation is independent of Group I mGluR signaling but involves BDNF, albeit with some delay.
  • These findings elucidate a critical mechanism in synaptic maturation and circuit refinement during early development.

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