Cited by 478Neuroinflammation and Neurodegeneration MechanismsGut microbiota and healthTryptophan and brain disorders

Microbiota-derived acetate enables the metabolic fitness of the brain innate immune system during health and disease

Open access
Erny, Daniel, Dokalis, Nikolaos, Mezö, Charlotte, Castoldi, Angela, Mossad, Omar, Staszewski, Ori, Frosch, Maximilian, Villa, Matteo +12 more·2021·Cell Metabolism

Abstract

As tissue macrophages of the central nervous system (CNS), microglia constitute the pivotal immune cells of this organ. Microglial features are strongly dependent on environmental cues such as commensal microbiota. Gut bacteria are known to continuously modulate microglia maturation and function by the production of short-chain fatty acids (SCFAs). However, the precise mechanism of this crosstalk is unknown. Here we determined that the immature phenotype of microglia from germ-free (GF) mice is epigenetically imprinted by H3K4me3 and H3K9ac on metabolic genes associated with substantial functional alterations including increased mitochondrial mass and specific respiratory chain dysfunctions. We identified acetate as the essential microbiome-derived SCFA driving microglia maturation and regulating the homeostatic metabolic state, and further showed that it is able to modulate microglial phagocytosis and disease progression during neurodegeneration. These findings indicate that acetate is an essential bacteria-derived molecule driving metabolic pathways and functions of microglia during health and perturbation.

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Crossref · 10.1016/j.cmet.2021.10.010

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  • Under homeostatic conditions, the gut microbiome is responsible for regulating microglial maturation and activation via short-chain fatty acids (SCFAs) release.

    “Under homeostatic conditions, the gut microbiome is responsible for regulating microglial maturation and activation via short-chain fatty acids (SCFAs) release.190,191”
  • The host microbiota regulates microglia mitochondrial functions and acetate is the major SCFA-rescuing microglial homeostasis in GF mice.

    “In a subsequent study, Erny et al. discovered that the host microbiota regulates microglia mitochondrial functions and identified acetate as the major SCFA-rescuing microglial homeostasis in GF mice.190”
  • In GF 5xFAD mice, administration of acetate aggravates hippocampal Aβ deposition by disrupting microglial phagocytosis of Aβ.

    “In GF 5xFAD mice, the administration of acetate aggravates hippocampal Aβ deposition by disrupting microglial phagocytosis of Aβ.190”
  • The majority of studies reporting detrimental effects of SCFAs were conducted using GF mice, which are functionally and structurally abnormal across various physiological functions.

    “Moreover, the majority of studies that reported the detrimental effects of SCFAs were conducted using GF mice,56,190,196,199 which are functionally and structurally abnormal across various physiological functions.313”
  • Acetate restores microglial homeostasis in GF mice, while propionate and butyrate do not have the same restorative effect.

    “In particular, acetate has been found to restore microglial homeostasis in GF mice, while propionate and butyrate do not have the same restorative effect.190”

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Authors
Erny, D., Dokalis, N., Mezö, C., Castoldi, A., Mossad, O., Staszewski, O., Frosch, M., Villa, M., Fuchs, V., Mayer, A., Neuber, J., Sosat, J., Tholen, S., Schilling, O., Vlachos, A., Blank, T., Gomez de Agüero, M., Macpherson, A. J., Pearce, E. J., & Prinz, M.
Affiliations
  • University of Freiburg (DE)
  • Max Planck Institute of Immunobiology and Epigenetics (DE)
  • University of Bern (CH)
Corresponding author
Prinz, Marco
Venue
Cell Metabolism
Publisher
Elsevier BV
Published
2021-11
Volume
33
Issue
11
Pages
2260-2276.e7
ISSN
1550-4131 (ISSN-L)
OpenAlex
W3209951581
Cited by
478
References
70
Citations by year
2026: 82 · 2025: 111 · 2024: 130 · 2023: 86 · 2022: 66 · 2021: 3
FWCI
28.53
Type
journal article
Language
en
Open access
Locations
  • Cell Metabolism (publishedVersion)
  • PubMed (publishedVersion)
  • Bern Open Repository and Information System (University of Bern) (submittedVersion)
Funders
  • Deutsche Forschungsgemeinschaft (A07, ID259373024, SFB/TRR167)
  • Medizinische Fakultät der Albert-Ludwigs-Universität Freiburg
  • Max-Planck-Gesellschaft
  • Novo Nordisk Fonden (SFB 1479, SFB 992)
  • Roman, Marga und Mareille Sobek Stiftung
  • Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (PZ00P3_168012)
  • Fritz Thyssen Stiftung
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Life Sciences › Neuroscience › Biological Psychiatry › Tryptophan and brain disorders
Keywords
acetate, short-chain fatty acids, microglia, gut microbiota, germ-free mice, microglial maturation, epigenetic regulation, H3K4me3, H3K9ac, mitochondrial dysfunction, electron transport chain, phagocytosis, neurodegeneration, innate immunity
MeSH terms
Acetates, Animals, Brain, Fatty Acids, Volatile, Immune System, Mice, Microbiota

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