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Microglial depletion and abnormalities in gut microbiota composition and short-chain fatty acids in mice after repeated administration of colony stimulating factor 1 receptor inhibitor PLX5622

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Abstract

PLX5622, a brain-penetrant highly specific inhibitor of the colony-stimulating factor 1 receptor (CSF1R), is used to eliminate microglia in the brain. Considering the role of microglia and gut microbiota in the brain homeostasis, this study was undertaken to investigate whether repeated intragastric administration of PLX5622 (65 mg/kg/day for consecutive 7 days) could affect the composition of gut microbiota and the concentration of short-chain fatty acids (SCFAs) in fresh feces of adult mice. Repeated administration of PLX5622 caused significant reductions of the expression of genes and proteins for microglial markers in the prefrontal cortex (PFC) and hippocampus compared to control mice although the elimination of brain’s microglia was partial. There was a significant alteration in the β-diversity of intestine microbiota in the PLX5622-treated group. Linear discriminant analysis effect size identified eight significant enriched bacteria as microbial markers for PLX5622-treated group. Repeated administration of PLX5622 affected the relative abundance of several bacteria at the genus and species levels. Furthermore, repeated administration of PLX5622 caused a significant change in lactic acid compared to control group. Interestingly, we found significant correlations between microglial markers in the brain and the relative abundance of several bacteria, suggesting microbiome–microglia crosstalk through the brain–gut axis. These data demonstrate that repeated administration of PLX5622 leads to an abnormal composition of the gut microbiota and lactic acid in adult mice. Therefore, abnormalities in the composition of gut microbiota after repeated treatment of PLX5622 should be considered for behavioral and biological functions in animals treated with CSF1R inhibitors.

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Acknowledgements

This study was supported by Japan Society for the Promotion of Science (JSPS) (to K.H., 21H00184 and 21H02846).

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  1. Division of Clinical Neuroscience, Chiba University Center for Forensic Mental Health, Chiba, 260-8670, Japan

    Yong Yang, Tamaki Ishima, Xiayun Wan, Yan Wei, Lijia Chang, Jiancheng Zhang, Youge Qu & Kenji Hashimoto

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Yang, Y., Ishima, T., Wan, X. et al. Microglial depletion and abnormalities in gut microbiota composition and short-chain fatty acids in mice after repeated administration of colony stimulating factor 1 receptor inhibitor PLX5622. Eur Arch Psychiatry Clin Neurosci 272, 483–495 (2022). https://doi.org/10.1007/s00406-021-01325-0

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