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N-methyl d-aspartate receptor antagonists ketamine and MK-801 induce wake-related aberrant gamma oscillations in the rat neocortex.

Abstract : BACKGROUND: Single subanesthetic doses of ketamine, a non-competitive NMDA receptor (NMDAr) antagonist, induce cognitive impairment, schizophreniform psychosis, hallucinations, and exacerbate schizophrenia symptoms. The neuronal mechanisms underlying transient disruption in NMDAr function are unknown. Disorders of cognition-related coherences of gamma frequency (30-80 Hz) oscillations between cortical areas are a major functional abnormality in schizophrenic patients. Does a single subanesthetic dose of ketamine or MK-801 alter properties of cortical gamma oscillations? METHODS: Properties of spontaneously occurring gamma oscillations in the electrocorticogram of the neocortex of freely moving rats (n = 16) were measured before and after subcutaneous administration of a single dose of ketamine (< or = 10 mg/kg), MK-801 (< or = .16 mg/kg), d-amphetamine (< or = 1 mg/kg), apomorphine (< or = 1.6 mg/kg), or vehicle (sodium chloride, .9%). RESULTS: The present study gives the first evidence that ketamine and MK-801, both of which induce NMDAr-dependent functional disconnections, dose-dependently increase the power (200%-400%) of wake-related gamma oscillations in the neocortex. Substances that modulate dopaminergic neurotransmission could also increase the gamma power but to a lesser degree. CONCLUSIONS: The present findings suggest that abnormal increased synchronization in ongoing gamma oscillations in cortical-related networks might cause dysfunctions of conscious integration, as seen in patients with schizophrenia.
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https://www.hal.inserm.fr/inserm-00238557
Contributor : Didier Pinault <>
Submitted on : Wednesday, February 6, 2008 - 6:31:45 PM
Last modification on : Thursday, April 23, 2020 - 2:26:29 PM
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Didier Pinault. N-methyl d-aspartate receptor antagonists ketamine and MK-801 induce wake-related aberrant gamma oscillations in the rat neocortex.. Biological Psychiatry, Elsevier, 2008, 63 (8), pp.730-5. ⟨10.1016/j.biopsych.2007.10.006⟩. ⟨inserm-00238557⟩

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