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Activity-induced decrease in early and late inhibitory synaptic conductances in hippocampus.

G J Pacelli1, W Su, S R Kelso

  • 1Department of Biological Sciences, University of Illinois, Chicago 60680.

Synapse (New York, N.Y.)
|January 1, 1991
PubMed
Summary
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Hippocampal inhibitory synaptic activity is temporarily depressed, enhancing excitatory transmission. This "gating" mechanism optimizes synaptic modification, especially during bursts, within a 200-300 msec window.

Area of Science:

  • Neuroscience
  • Synaptic Plasticity
  • Hippocampal Circuitry

Background:

  • Inhibitory postsynaptic potentials (IPSPs) regulate neuronal excitability.
  • Understanding the use-dependence of synaptic responses is crucial for deciphering neural circuit function.

Purpose of the Study:

  • To investigate the use-dependence of IPSPs and their conductances in hippocampal CA1.
  • To determine the impact of synaptic input timing on excitatory and inhibitory postsynaptic potentials (EPSPs/IPSPs).

Main Methods:

  • Intracellular current-clamp and single-electrode voltage-clamp recordings in rat hippocampal brain slices.
  • Two-pulse and four-pulse synaptic stimulation paradigms were employed.
  • Analysis of IPSP/EPSP waveforms, reversal potentials, and underlying conductances.

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Main Results:

  • Paired synaptic stimulation induced a "primed" response with reduced IPSPs and enhanced EPSPs, optimal at 200-250 msec intervals.
  • IPSP conductances decreased significantly (early: ~50%, late: ~95%) during the primed response.
  • Primed four-pulse bursts caused greater postsynaptic depolarization than unprimed bursts.

Conclusions:

  • Hippocampal synaptic pathways create a 200-300 msec window of depressed inhibition and enhanced excitation.
  • This inhibitory gating mechanism facilitates long-term synaptic modification at excitatory synapses.