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The synaptic basis of GABAA,slow

M I Banks1, T B Li, R A Pearce

  • 1Anesthesiology, University of Wisconsin, Madison, Wisconsin 53706, USA.

The Journal of Neuroscience : the Official Journal of the Society for Neuroscience
|March 14, 1998
PubMed
Summary

Two types of inhibitory GABAA responses exist in hippocampal CA1 pyramidal neurons. This study identifies both fast and slow spontaneous inhibitory postsynaptic currents (sIPSCs), revealing distinct interneuron populations and receptor targets.

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Area of Science:

  • Neuroscience
  • Synaptic Transmission
  • Cellular Electrophysiology

Background:

  • Two kinetically distinct GABAA responses (fast and slow) are known in CA1 pyramidal neurons.
  • Previous studies of spontaneous inhibitory postsynaptic currents (sIPSCs) reported only fast events, questioning the synaptic origin of slow GABAA responses.

Purpose of the Study:

  • To investigate the synaptic basis of slow GABAA responses in CA1 pyramidal neurons.
  • To determine if both fast and slow GABAA responses originate from synaptic events.
  • To characterize the properties and origins of fast and slow sIPSCs.

Main Methods:

  • Minimally evoked spontaneous and miniature IPSCs were recorded in CA1 pyramidal neurons.
  • Pharmacological analysis using furosemide, a GABAA antagonist, was performed.
  • Electrophysiological recordings included whole-cell patch-clamp and excised patch-clamp techniques.

Main Results:

  • Two distinct classes of sIPSCs were identified, corresponding to fast and slow GABAA responses.
  • Slow sIPSCs occurred less frequently, suggesting interneurons with lower spontaneous firing rates.
  • Furosemide differentially modulated fast and slow IPSCs, indicating distinct postsynaptic receptor populations.
  • Furosemide's action on fast IPSCs confirmed direct postsynaptic receptor blockade.

Conclusions:

  • Both fast and slow GABAA responses are synaptic in origin.
  • Distinct interneuron populations generate fast and slow sIPSCs.
  • These interneurons target anatomically segregated and pharmacologically distinct postsynaptic GABAA receptors in the hippocampus.

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