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Activity- and age-dependent GABAergic synaptic plasticity in the developing rat hippocampus.

P Gubellini1, Y Ben-Ari, J L Gaïarsa

  • 1Institut de Neurobiologie de la Mediterranée (INMED), Institut National de la Santé et de la Recherche Médicale (INSERM) Unité 29, Avenue de Luminy, BP 13, 13273 Marseille Cedex 09, France.

The European Journal of Neuroscience
|February 28, 2002
PubMed
Summary

Activity-dependent plasticity of GABAergic synapses in developing rat hippocampus is regulated by specific stimulation frequencies. This plasticity is crucial for GABAergic synaptic transmission maturation but is limited to a critical developmental window.

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Area of Science:

  • Neuroscience
  • Developmental Biology
  • Synaptic Plasticity

Background:

  • GABAergic synaptic transmission plays a critical role in regulating neuronal excitability and network activity during brain development.
  • Activity-dependent mechanisms are essential for refining synaptic connections and ensuring proper functional maturation of neural circuits.
  • Understanding the developmental timeline and conditions for GABAergic plasticity is key to comprehending early brain development and potential disorders.

Purpose of the Study:

  • To investigate the developmental window for activity-dependent plasticity of GABAergic synaptic transmission in the rat hippocampus.
  • To determine the influence of specific stimulation protocols on GABAergic synaptic function during early postnatal development.
  • To elucidate the potential role of activity-induced modifications in the functional maturation of GABAergic synapses.

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Main Methods:

  • Whole-cell patch-clamp recordings were performed on rat hippocampal slices from postnatal day 0 to 15.
  • Spontaneous GABA(A) receptor-mediated postsynaptic currents (sGABA(A)-PSCs) were isolated.
  • A conditioning protocol using repetitive depolarizing pulses (DPs) at varying frequencies (0.05 Hz, 0.1 Hz, 1 Hz) was applied.

Main Results:

  • Repetitive depolarizing pulses (DPs) at 0.1 Hz induced long-lasting changes in sGABA(A)-PSC frequency and amplitude between postnatal days 0 and 8.
  • This plasticity was absent from postnatal day 12 onwards, indicating a critical developmental window.
  • DPs at 0.05 Hz or 1 Hz failed to induce significant synaptic plasticity, highlighting the frequency-dependence of the effect. DPs also activated previously silent synapses in very young animals (P0-1).

Conclusions:

  • Long-term changes in GABAergic synaptic activity can be induced during a restricted developmental period (P0-8) in the rat hippocampus.
  • The induction of plasticity is dependent on the frequency of the conditioning stimulation, with 0.1 Hz being effective.
  • Activity-induced modifications of GABAergic synapses likely represent a physiological mechanism contributing to the functional maturation of GABAergic transmission during early development.