Ketamine has distinct electrophysiological and behavioral effects in depressed and healthy subjects

Abstract

Ketamine’s mechanism of action was assessed using gamma power from magnetoencephalography (MEG) as a proxy measure for homeostatic balance in 35 unmedicated subjects with major depressive disorder (MDD) and 25 healthy controls enrolled in a double-blind, placebo-controlled, randomized cross-over trial of 0.5 mg/kg ketamine. MDD subjects showed significant improvements in depressive symptoms, and healthy control subjects exhibited modest but significant increases in depressive symptoms for up to 1 day after ketamine administration. Both groups showed increased resting gamma power following ketamine. In MDD subjects, gamma power was not associated with the magnitude of the antidepressant effect. However, baseline gamma power was found to moderate the relationship between post-ketamine gamma power and antidepressant response; specifically, higher post-ketamine gamma power was associated with better response in MDD subjects with lower baseline gamma, with an inverted relationship in MDD subjects with higher baseline gamma. This relationship was observed in multiple regions involved in networks hypothesized to be involved in the pathophysiology of MDD. This finding suggests biological subtypes based on the direction of homeostatic dysregulation and has important implications for inferring ketamine’s mechanism of action from studies of healthy controls alone.

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Acknowledgements

We thank the 7SE research unit and staff for their support. Ioline Henter (NIMH) provided invaluable editorial assistance.

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Correspondence to Allison C. Nugent.

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Conflict of interest

Funding for this work was supported by the Intramural Research Program at the National Institute of Mental Health, National Institutes of Health (IRP-NIMH-NIH; NCT00088699/04-M-0222/ZIA MH002857), by a NARSAD Independent Investigator Award to C.A.Z., and by a Brain and Behavior Mood Disorders Research Award to C.A.Z. C.A.Z. is listed as a co-inventor on a patent for the use of ketamine in major depression and suicidal ideation. C.A.Z. is listed as a co-inventor on a patent for the use of (2 R,6 R)-hydroxynorketamine, (S)-dehydronorketamine, and other stereoisomeric dehydro and hydroxylated metabolites of (R,S)-ketamine metabolites in the treatment of depression and neuropathic pain. C.A.Z. is listed as co-inventor on a patent application for the use of (2 R,6 R)-hydroxynorketamine and (2 S,6 S)-hydroxynorketamine in the treatment of depression, anxiety, anhedonia, suicidal ideation, and PTSDs; he has assigned his patent rights to the US government, but will share a percentage of any royalties that may be received by the government. The remaining authors declare that they have no conflict of interest.

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Nugent, A.C., Ballard, E.D., Gould, T.D. et al. Ketamine has distinct electrophysiological and behavioral effects in depressed and healthy subjects. Mol Psychiatry 24, 1040–1052 (2019). https://doi.org/10.1038/s41380-018-0028-2

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