Gamma-hydroxybutyric acid decreases thalamic sensory excitatory postsynaptic potentials by an action on presynaptic
1Physiology Unit, School of Molecular and Medical Biosciences, University of Wales Cardiff, UK.
Abstract:
The effect of gamma-hydroxybutyric acid (GHB) on the excitatory postsynaptic potential (EPSP) evoked in thalamocortical neurones of the rat dorsal lateral geniculate nucleus and ventrobasal thalamus was investigated in vitro. GHB (0.1-5 mM) dose-dependently and reversibly decreased (36-78%) the amplitude of the sensory EPSP. This effect of GHB was blocked by the GABAB receptor antagonist CGP 35348 (1 mM). NCS 382 (1-3 mM), a putative GHB receptor antagonist, did not antagonise but weakly potentiated both the GHB- and baclofen-mediated decrease of the EPSP amplitude.
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