Abstract
Ketamine exhibits rapid and sustained antidepressant effects. As decreased myelination has been linked to depression pathology, changes in myelination may be a pivotal mechanism underlying ketamine’s long-lasting antidepressant effects. Although ketamine has a long-lasting facilitating effect on myelination, the precise roles of myelination in ketamine’s sustained antidepressant effects remain unknown. In this study, we employed spatial transcriptomics (ST) to examine ketamine’s lasting effects in the medial prefrontal cortex (mPFC) and hippocampus of mice subjected to chronic social defeat stress and identified several differentially expressed myelin-related genes. Ketamine’s ability to restore impaired myelination in the brain by promoting the differentiation of oligodendrocyte precursor cells (OPCs) into mature oligodendrocytes was demonstrated. Moreover, we showed that inhibiting the expression of myelin-associated oligodendrocytic basic protein (Mobp) blocked ketamine’s long-lasting antidepressant effects. We also illustrated that α-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid receptor (AMPAR) signaling mediated ketamine’s facilitation on myelination. In addition, we found that the (R)-stereoisomer of ketamine showed stronger effects on myelination than (S)-ketamine, which may explain its longer-lasting antidepressant effects. These findings reveal novel mechanisms underlying the sustained antidepressant effects of ketamine and the differences in antidepressant effects between (R)-ketamine and (S)-ketamine, providing new insights into the role of myelination in antidepressant mechanisms.
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Data availability
The raw data of RNA sequencing were uploaded to NCBI GEO database. The address is "https://www.ncbi.nlm.nih.gov/geo/query/acc.cgi?acc=GSE214861". The access code is "gtaxuwuwbnglhsj". All other data are available in the main text or the Supplementary Material.
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Acknowledgements
We acknowledged Mr. Changyong Qi and Ms. Xiaochuan Zou for animal colony maintenance, OEbiotech Inc. for technical support on spatial transcriptomics, and Raygen Health Molecular Medicine Inc. for technical support on in vivo two-photon imaging.
Funding
This study was supported by grants from the National Natural Science Foundation of China (82271254, 81974171, 82201420, 82070405, 82101270, and 82171189), Innovative and Entrepreneurial Team of Jiangsu Province (JSSCTD202144), Natural Science Foundation of Jiangsu Province (BK20211382 and BK20210975), China Postdoctoral Science Foundation (2021M701496), and Japan Society for the Promotion of Science (21H02846).
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CY, KH and J-jY contributed to the conception of the study; CY, KH, J-jY, CL and GC designed experiments. KH, CL and GC provided samples and reagents; CH, DW, ZW, YQ, JZ, RJ, XQX, XX, YW, HL and TH performed the experiments; ZW, DW and CH contributed to data analysis; CY, KH, CH, ZW and DW wrote the manuscript. All the authors approved the submission.
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CY has received research support from Nhwa. KH is the inventor of filed patent applications on “The use of R-Ketamine in the treatment of psychiatric diseases”, “(S)-norketamine and salt thereof as pharmaceutical”, “R-Ketamine and derivative thereof as prophylactic or therapeutic agent for neurodegeneration disease or recognition function disorder”, “Preventive or therapeutic agent and pharmaceutical composition for inflammatory diseases or bone diseases”, and “R-Ketamine and its derivatives as a preventive or therapeutic agent for a neurodevelopmental disorder” by the Chiba University. KH has also received speakers’ honoraria, consultant fee, or research support from Abbott, Meiji Seika Pharma, Seikagaku Corporation, Sumitomo Pharma, Taisho, Otsuka, Murakami Farm and Perception Neuroscience. Other authors declare no conflict of interest.
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Huang, C., Wu, Z., Wang, D. et al. Myelin-associated oligodendrocytic basic protein-dependent myelin repair confers the long-lasting antidepressant effect of ketamine. Mol Psychiatry (2023). https://doi.org/10.1038/s41380-023-02288-5
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DOI: https://doi.org/10.1038/s41380-023-02288-5
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