Journal
CEREBRAL CORTEX
Volume 27, Issue 6, Pages 3172-3185Publisher
OXFORD UNIV PRESS INC
DOI: 10.1093/cercor/bhw168
Keywords
electrophysiology; gamma oscillations; network noise; schizophrenia; sensory-evoked potential
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Funding
- French National Institute of Health and Medical Research (Institut National de la Sante et de la Recherche Medicale)
- l'Universite de Strasbourg
- Neurex
- Australian Endeavour Research Fellowship Award
- la Fondation pour la Recherche Medicale
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The non-competitive N-methyl. -aspartate glutamate receptor (NMDAR) antagonist ketamine elicits a brain state resembling high-risk states for developing psychosis and early stages of schizophrenia characterized by sensory and cognitive deficits and aberrant ongoing gamma (30-80 Hz) oscillations in cortical and subcortical structures, including the thalamus. The underlying mechanisms are unknown. The goal of the present study was to determine whether a ketamine-induced psychotic-relevant state disturbs the functional state of the corticothalamic (CT) pathway. Multisite field recordings were performed in the somatosensory CT system of the sedated rat. Baseline activity was challenged by activation of vibrissa-related prethalamic inputs. The sensory-evoked thalamic response was characterized by a short-latency (similar to 4 ms) prethalamic-mediated negative sharp potential and a longer latency (similar to 10 ms) CT-mediated negative potential. Following a single subcutaneous injection of ketamine (2.5 mg/kg), spontaneously occurring and sensory-evoked thalamic gamma oscillations increased and decreased in power, respectively. The power of the sensory-related gamma oscillations was positively correlated with both the amplitude and the area under the curve of the corresponding CT potential but not with the prethalamic potential. The present results show that the layer VI CT pathway significantly contributes in thalamic gamma oscillations, and they support the hypothesis that reduced NMDAR activation disturbs the functional state of CT and corticocortical networks.
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