Cited by 1,683Parkinson's Disease Mechanisms and TreatmentsNeuroinflammation and Neurodegeneration MechanismsNuclear Receptors and Signaling

Idiopathic Parkinson's disease: possible routes by which vulnerable neuronal types may be subject to neuroinvasion by an unknown pathogen

Braak, H., R�b, U., Gai, W. P., Del Tredici, K.·2003·Journal of Neural Transmission

Abstract

The progressive, neurodegenerative process underlying idiopathic Parkinson's disease is associated with the formation of proteinaceous inclusion bodies that involve a few susceptible neuronal types of the human nervous system. In the lower brain stem, the process begins in the dorsal motor nucleus of the vagus nerve and advances from there essentially upwards through susceptible regions of the medulla oblongata, pontine tegmentum, midbrain, and basal forebrain until it reaches the cerebral cortex. With time, multiple components of the autonomic, limbic, and motor systems become severely impaired. All of the vulnerable subcortical grays and cortical areas are closely interconnected. Incidental cases of idiopathic Parkinson's disease may show involvement of both the enteric nervous system and the dorsal motor nucleus of the vagus nerve. This observation, combined with the working hypothesis that the stereotypic topographic expansion pattern of the lesions may resemble that of a falling row of dominos, prompts the question whether the disorder might originate outside of the central nervous system, caused by a yet unidentified pathogen that is capable of passing the mucosal barrier of the gastrointestinal tract and, via postganglionic enteric neurons, entering the central nervous system along unmyelinated praeganglionic fibers generated from the visceromotor projection cells of the vagus nerve. By way of retrograde axonal and transneuronal transport, such a causative pathogen could reach selectively vulnerable subcortical nuclei and, unimpeded, gain access to the cerebral cortex. The here hypothesized mechanism offers one possible explanation for the sequential and apparently uninterrupted manner in which vulnerable brain regions, subcortical grays and cortical areas become involved in idiopathic Parkinson's disease.

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Crossref · 10.1007/s00702-002-0808-2

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  • Inflammation and oxidative stress are caused by swallowing nasal secretions, which leads to the accumulation of α-synuclein in the CNS.

    “Inflammation and oxidative stress are caused by swallowing nasal secretions, which leads to the accumulation of a-synuclein in the CNS.134”
  • The vagal nerve might provide a path for the spread of alpha-synuclein pathology from the enteric nervous system to the brain through the brainstem, midbrain, basal forebrain, and cortical areas.

    “The vagal nerve might provide a path for the spread of alpha-synuclein pathology from the ENS to the brain through the brainstem, midbrain, basal forebrain and finally the cortical areas (Braak et al., 2003;Hawkes et al., 2007)”
  • A toxin or pathogen and associated immune/inflammatory responses might start the detrimental process in the enteric nervous system and/or olfactory bulbs and spread via the vagal nerve and olfactory tract to the substantia nigra and further areas of the central nervous system.

    “where a toxin or a pathogen and associated immune/inflammatory responses might start the detrimental process and spread according to a specific pattern, via the vagal nerve and olfactory tract respectively, to the SN and further areas of the CNS”
  • Alpha-synuclein deposition in neurons might begin in the enteric nervous system and/or in the olfactory bulbs.

    “new evidence suggests that alpha-synuclein deposition in neurons might begin in the ENS and/or in the OB”
  • Braak and colleagues hypothesized that alpha-synuclein pathology might start in the olfactory bulbs and/or enteric nervous system by an unknown pathogen and/or environmental toxin and then progress to the substantia nigra and further areas of the central nervous system.

    “Braak and colleagues hypothesized that alpha-synuclein pathology might start in either the OB and/or in the ENS possibly by an unknown pathogen and/or environmental toxin and then progresses towards the SN and further areas in the CNS.”

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Authors
Braak, H., R�b, U., Gai, W. P., & Del Tredici, K.
Affiliations
  • Goethe University Frankfurt (DE)
  • Flinders University (AU)
Venue
Journal of Neural Transmission
Published
2003-05-01
Volume
110
Issue
5
Pages
517-536
ISSN
  • 0300-9564 (ISSN-L)
  • 1435-1463
OpenAlex
W2044908785
Cited by
1,683
References
102
Citations by year
2026: 72 · 2025: 118 · 2024: 120 · 2023: 132 · 2022: 161 · 2021: 170 · 2020: 129 · 2019: 107 · 2018: 84 · 2017: 84 · 2016: 67 · 2015: 66 · 2014: 56 · 2013: 55 · 2012: 44
FWCI
8.77
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neural Transmission (publishedVersion)
  • PubMed (publishedVersion)
  • Flinders Academic Commons (Flinders University) (submittedVersion)
Topics
  • Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Nuclear Receptors and Signaling
Keywords
idiopathic Parkinson's disease, neuroinvasion, neurodegeneration, dorsal motor nucleus of the vagus, enteric nervous system, transneuronal transport, retrograde axonal transport, subcortical gray matter
MeSH terms
Brain, Brain Stem, Humans, Neural Pathways, Neurons, Parkinson Disease, Severity of Illness Index, Vagus Nerve, Disease Progression

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