Cited by 170Parkinson's Disease Mechanisms and TreatmentsGut microbiota and healthNeuroinflammation and Neurodegeneration Mechanisms

Oral administration of Proteus mirabilis damages dopaminergic neurons and motor functions in mice

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Choi, Jin Gyu, Kim, Namkwon, Ju, In Gyoung, Eo, Hyeyoon, Lim, Su-Min, Jang, Se-Eun, Kim, Dong-Hyun, Oh, Myung Sook·2018·Scientific Reports

Abstract

Recently, studies on the relationship between gut dysbiosis and Parkinson’s disease (PD) have increased, but whether a specific gut bacterium may cause PD remains unexplored. Here, we report, for the first time, that a specific gut bacterium directly induces PD symptoms and dopaminergic neuronal damage in the mouse brain. We found that the number of Enterobacteriaceae, particularly Proteus mirabilis, markedly and commonly increased in PD mouse models. Administration of P. mirabilis isolated from PD mice significantly induced motor deficits, selectively caused dopaminergic neuronal damage and inflammation in substantia nigra and striatum, and stimulated α-synuclein aggregation in the brain as well as in the colon. We found that lipopolysaccharides, a virulence factor of P. mirabilis, may be associated in these pathological changes via gut leakage and inflammatory actions. Our results suggest a role of P. mirabilis on PD pathogenesis in the brain.

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  • Proteus mirabilis can cause motor dyskinesia, produce neuroinflammation and cause dopaminergic neuronal damage by producing LPS.

    “Proteus mirabilis can cause motor dyskinesia, produce neuroinflammation and cause dopaminergic neuronal damage by producing LPS (Choi et al. 2018).”
  • Proteus mirabilis may trigger neuroinflammation and lead to pathological changes related to PD by its metabolites (such as lipopolysaccharide).

    “that may trigger neuroinflammation and lead to pathological changes related to PD by its metabolites (such as lipopolysaccharide) [39]”
  • Mice exposed to MPTP or 6-hydroxydopamine presented increased amount of Proteus mirabilis in their feces.

    “Mice exposed to 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine (MPTP) or 6-hydroxydopamine presented increased amount of Proteus mirabilis in their feces.”
  • After repeated oral administration of Proteus mirabilis isolated from MPTP/6-hydroxydopamine models to wild-type mice, the treated animals displayed Parkinson's disease-like symptoms, including impaired motor function, elevated α-synuclein aggregation in the brain and colon, and dopaminergic neuronal loss.

    “After repeated oral administration of these bacteria isolated from the above-mentioned models to WT mice, the treated animals displayed Parkinson's disease-like symptoms, including impaired motor function, elevated α-synuclein aggregation in the brain and colon as well as dopaminergic neuronal loss [408].”
  • Repeated oral administration of Proteus mirabilis or its derived LPS to MPTP-treated or young mice was sufficient to induce a PD-like phenotype with motor deficit, loss of dopaminergic neurons in the nigra, brain and gut inflammation with disruption of the intestinal epithelial barrier, and formation of α-syn inclusions in the brain and in the colon.

    “In the end, in a differently induced model of PD, the repeated oral administration of Proteus mirabilis or its derived LPS to 1-methyl-4-phenyl-1,2,3,6-tetrahydropyridine-treated or young mice was sufficient to induce a PD-like phenotype with motor deficit, loss of dopaminergic neurons in the nigra, brain and gut inflammation with disruption of the intestinal epithelial barrier, and formation of α”

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Research works printed but not linked: 1

  1. [63]Paxinos, G. & Franklin, K. Paxinos and Franklin’s the Mouse Brain in Stereotaxic Coordinates 4th Edition. 4th edn, (Academic Press, 2012).

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Authors
Choi, J. G., Kim, N., Ju, I. G., Eo, H., Lim, S.-M., Jang, S.-E., Kim, D.-H., & Oh, M. S.
Affiliations
Kyung Hee University (KR)
Corresponding author
  • Kim, Dong-Hyun
  • Oh, Myung Sook
Venue
Scientific Reports
Published
2018-01-19
Volume
8
Issue
1
Pages
1275-1275
ISSN
2045-2322 (ISSN-L)
OpenAlex
W2782946155
Cited by
170
References
65
Citations by year
2026: 12 · 2025: 19 · 2024: 23 · 2023: 32 · 2022: 23 · 2021: 25 · 2020: 19 · 2019: 14 · 2018: 3
FWCI
10.36
Type
journal article
Language
en
Open access
Locations
  • Scientific Reports (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
Funders
  • National Research Foundation (2015R1A2A2A01004341)
  • National Research Foundation of Korea (NRF-2017R1A5A2014768, 2017R1A5A2014768, NRF-2015R1A2A2A01004341)
  • Ministry of Science and ICT, South Korea (NRF-2017R1A5A2014768, 2017R1A5A2014768)
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Gut microbiota and health
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
Proteus mirabilis, Parkinson's disease, dopaminergic neurons, motor impairment, gut dysbiosis, Enterobacteriaceae, lipopolysaccharide, leaky gut, neuroinflammation, substantia nigra, striatum, alpha-synuclein aggregation, gut-brain axis, oral administration
MeSH terms
Gastrointestinal Microbiome, Animals, Colon, Corpus Striatum, Lipopolysaccharides, Male, Mice, Inbred C57BL, Movement, Proteus mirabilis, Substantia Nigra, MPTP Poisoning, Mice, Dopaminergic Neurons

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