Cited by 82Parkinson's Disease Mechanisms and TreatmentsNeuroinflammation and Neurodegeneration MechanismsGut microbiota and health

A prebiotic diet modulates microglial states and motor deficits in α-synuclein overexpressing mice

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Abdel-Haq, Reem, Schlachetzki, Johannes CM, Boktor, Joseph C, Cantu-Jungles, Thaisa M, Thron, Taren, Zhang, Mengying, Bostick, John W, Khazaei, Tahmineh +11 more·2022·eLife

Published version of a preprint

Abstract

Parkinson’s disease (PD) is a movement disorder characterized by neuroinflammation, α-synuclein pathology, and neurodegeneration. Most cases of PD are non-hereditary, suggesting a strong role for environmental factors, and it has been speculated that disease may originate in peripheral tissues such as the gastrointestinal (GI) tract before affecting the brain. The gut microbiome is altered in PD and may impact motor and GI symptoms as indicated by animal studies, although mechanisms of gut-brain interactions remain incompletely defined. Intestinal bacteria ferment dietary fibers into short-chain fatty acids, with fecal levels of these molecules differing between PD and healthy controls and in mouse models. Among other effects, dietary microbial metabolites can modulate activation of microglia, brain-resident immune cells implicated in PD. We therefore investigated whether a fiber-rich diet influences microglial function in α-synuclein overexpressing (ASO) mice, a preclinical model with PD-like symptoms and pathology. Feeding a prebiotic high-fiber diet attenuates motor deficits and reduces α-synuclein aggregation in the substantia nigra of mice. Concomitantly, the gut microbiome of ASO mice adopts a profile correlated with health upon prebiotic treatment, which also reduces microglial activation. Single-cell RNA-seq analysis of microglia from the substantia nigra and striatum uncovers increased pro-inflammatory signaling and reduced homeostatic responses in ASO mice compared to wild-type counterparts on standard diets. However, prebiotic feeding reverses pathogenic microglial states in ASO mice and promotes expansion of protective disease-associated macrophage (DAM) subsets of microglia. Notably, depletion of microglia using a CSF1R inhibitor eliminates the beneficial effects of prebiotics by restoring motor deficits to ASO mice despite feeding a prebiotic diet. These studies uncover a novel microglia-dependent interaction between diet and motor symptoms in mice, findings that may have implications for neuroinflammation and PD.

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  • Boosting levels of SCFAs with prebiotic intervention upregulates the neuroprotective phenotype of microglia in ASO mice, coupled with reduced motor deficits and α-synuclein aggregation in the SN.

    “Boosting the levels of SCFAs with prebiotic intervention upregulates the neuroprotective phenotype of microglia in ASO mice, coupled with reduced motor deficits and α-synuclein aggregation in the SN.318”

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Authors
Abdel-Haq, R., Schlachetzki, J. C., Boktor, J. C., Cantu-Jungles, T. M., Thron, T., Zhang, M., Bostick, J. W., Khazaei, T., Chilakala, S., Morais, L. H., Humphrey, G., Keshavarzian, A., Katz, J. E., Thomson, M., Knight, R., Gradinaru, V., Hamaker, B. R., Glass, C. K., & Mazmanian, S. K.
Affiliations
  • California Institute of Technology (US)
  • University of California San Diego (US)
  • Purdue University West Lafayette (US)
  • University of Southern California (US)
  • Division of Biology and Biological Engineering, California Institute of Technology
  • Rush University Medical Center (US)
Corresponding author
Mazmanian, Sarkis K
Venue
eLife
Published
2022-11-08
Volume
11
ISSN
2050-084X (ISSN-L)
OpenAlex
W4308633748
Cited by
82
References
92
Citations by year
2026: 16 · 2025: 32 · 2024: 25 · 2023: 8 · 2022: 1
FWCI
8.69
Type
journal article
Language
en
Open access
Locations
  • eLife (publishedVersion, cc-by)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • CaltechAUTHORS (California Institute of Technology) (submittedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • eScholarship (California Digital Library) (submittedVersion, cc-by)
Funders
  • U.S. Department of Defense (PD160030)
  • Heritage Medical Research Institute (HMRI-15-09-01)
  • Aligning Science Across Parkinson's (ASAP-000375)
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
Keywords
Parkinson's disease, dietary fiber, microglia, alpha-synuclein overexpression, gut microbiota, short-chain fatty acids, neuroinflammation, motor impairment, substantia nigra, CSF1R inhibition, gut-brain axis, microglial activation
MeSH terms
Animals, Diet, Disease Models, Animal, Mice, Inbred C57BL, Parkinson Disease, Substantia Nigra, Microglia, Mice, alpha-Synuclein, Prebiotics

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