Baclofen-induced disinhibition in area CA1 of rat hippocampus is resistant to extracellular Ba2+

Nevin A Lambert, Neil L. Harrison, Timothy J. Teyler

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The mechanism of disinhibition produced by (±)-baclofen was studied using intracellular recording in area CA1 of rat hippocampal slices. Baclofen reversibly depressed monosynaptic IPSPs evoked by direct activation of interneurons in the presence of the excitatory amino acid receptor antagonists 6,7-dinitroquinoxaline-2,3-dione (DNQX) and d,l-2amino-5-phosphonovalerate (APV). Ba2+ prevented baclofen-induced hyperpolarization of pyramidal neurons but not depression of monosynaptic IPSPs by baclofen. Baclofen reversibly depressed monosynaptic IPSPs when applied close to the recording site, but was ineffective when applied close to the stimulating site in stratum radiatum. These results suggest that baclofen disinhibits pyramidal neurons in area CA1 of the rat hippocampus by activating receptors on the terminals of inhibitory neurons that are coupled to a Ba2+-insensitive effector mechanism.

Original languageEnglish (US)
Pages (from-to)349-352
Number of pages4
JournalBrain Research
Issue number2
Publication statusPublished - May 3 1991
Externally publishedYes



  • CGP 35348
  • GABA receptor
  • Inhibitory neuron
  • Interneuron

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

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