Infection with mosquito-borne alphavirus induces selective loss of dopaminergic neurons, neuroinflammation and widespread protein aggregation
Open accessAbstract
Neuroinvasive infections with mosquito-borne alphaviruses such as Western equine encephalitis virus (WEEV) can cause post-encephalitic parkinsonism. To understand the mechanisms underlying these neurological effects, we examined the capacity of WEEV to induce progressive neurodegeneration in outbred CD-1 mice following non-lethal encephalitic infection. Animals were experientally infected with recombinant WEEV expressing firefly luciferase or dsRed (RFP) reporters and the extent of viral replication was controlled using passive immunotherapy. WEEV spread along the neuronal axis from the olfactory bulb to the entorhinal cortex, hippocampus and basal midbrain by 4 days post infection (DPI). Infection caused activation of microglia and astrocytes, selective loss of dopaminergic neurons in the substantia nigra pars compacta (SNpc) and neurobehavioral abnormalities. After 8 weeks, surviving mice displayed continued loss of dopamine neurons in the SNpc, lingering glial cell activation and gene expression profiles consistent with a neurodegenerative phenotype. Strikingly, prominent proteinase K-resistant protein aggregates were present in the the entorhinal cortex, hippocampus and basal midbrain that stained positively for phospho-serine129 α-synuclein (SNCA). These results indicate that WEEV may cause lasting neurological deficits through a severe neuroinflammatory response promoting both neuronal injury and protein aggregation in surviving individuals.
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Viral infections may play a role in developing and progressing neurodegenerative disorders, particularly Alzheimer's disease.
“suggesting a potential role in developing and progressing neurodegenerative disorders, particularly AD (Bantle et al., 2019; Piekut et al., 2022; Ronca et al., 2017).”
From Arbovirus infection increases the risk for the development of neurodegenerative disease pathology in the murine model (2024) · cites this paper as Bantle et al., 2019
The Discussion says viral infection is a possible risk factor for neurodegenerative diseases, explicitly including Alzheimer’s disease. The Introduction also describes viral infection as a potential contributor to multiple neurodegenerative diseases. The paper does not specifically establish a role in Alzheimer’s disease progression or give AD particular emphasis; its experiments focus on Parkinson’s-like pathology in mice. (LLM, conf=0.82)
Experimental — accuracy not yet measuredViral infections such as Herpes simplex encephalitis, Epstein-Barr virus, Eastern Equine Encephalitis virus, Western Equine Encephalitis virus, and Venezuelan Equine Encephalitis Virus correlate with negative neurological consequences even after the acute phase.
“Several studies have shown that viral infections, such as Herpes simplex encephalitis, Epstein-Barr virus, Eastern Equine Encephalitis virus (EEEV), Western Equine Encephalitis virus (WEEV), and Venezuelan Equine Encephalitis Virus (VEEV), correlate with negative neurological consequences even after the acute phase”
From Arbovirus infection increases the risk for the development of neurodegenerative disease pathology in the murine model (2024) · cites this paper as Bantle et al., 2019
The Introduction reports neurological symptoms persisting long after acute WEEV infection, and the Discussion describes deficits in mice eight weeks after infection. The Discussion also mentions neurological injury associated with Epstein–Barr virus, but does not establish that it persists after the acute phase. The retrieved passages do not establish post-acute neurological consequences for herpes simplex encephalitis, EEEV, or VEEV; EEEV and VEEV appear only in references to other work. (LLM, conf=0.88)
Experimental — accuracy not yet measuredWEEV infection in a rodent model produces phospho-serine129 alpha-synuclein positive, proteinase K-resistant protein aggregates, indicating neurological sequelae and neuronal injury consistent with a Parkinson's neurodegenerative phenotype.
“Interestingly, phospho-serine129 α-synuclein positive, proteinase K-resistant protein aggregates are also present, indicating neurological sequelae and neuronal injury consistent with Parkinson's neurodegenerative phenotype (Bantle et al., 2019).”
From Arbovirus infection increases the risk for the development of neurodegenerative disease pathology in the murine model (2024) · cites this paper as Bantle et al., 2019
WEEV infection in a rodent model leads to glial cell activation and acute and chronic loss of dopaminergic neurons in the substantia nigra pars compacta.
“For example, WEEV infection in a rodent model leads to glial cell activation and acute and chronic loss of dopaminergic neurons in the substantia nigra pars compacta (Bantle et al., 2019).”
From Arbovirus infection increases the risk for the development of neurodegenerative disease pathology in the murine model (2024) · cites this paper as Bantle et al., 2019
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- Authors
- Bantle, C. M., Phillips, A. T., Smeyne, R. J., Rocha, S. M., Olson, K. E., & Tjalkens, R. B.
- Affiliations
- Colorado State University (US)
- Thomas Jefferson University (US)
- Corresponding author
- Tjalkens, Ronald B.
- ORCID
- Venue
- npj Parkinson's Disease
- Published
- 2019-09-13
- Volume
- 5
- Issue
- 1
- Pages
- 20-20
- ISSN
- 2373-8057 (ISSN-L)
- PMC
- PMC6744428
- OpenAlex
- W2972589620
- Cited by
- 89
- References
- 84
- Citations by year
- 2026: 11 · 2025: 11 · 2024: 10 · 2023: 11 · 2022: 16 · 2021: 16 · 2020: 14
- FWCI
- 5.07
- Type
- journal article
- Language
- en
- Open access
- gold
- doi.org
- Locations
- npj Parkinson s Disease (publishedVersion, cc-by)
- PubMed Central (publishedVersion, cc-by)
- PubMed (publishedVersion)
- DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion)
- Funders
- Colorado State University
- National Institute of Environmental Health Sciences (R01ES030937)
- Topics
- Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
- Health Sciences › Medicine › Public Health, Environmental and Occupational Health › Mosquito-borne diseases and control
- Health Sciences › Medicine › Neurology › Parkinson's Disease Mechanisms and Treatments
- Keywords
- western equine encephalitis virus, alphavirus, postencephalitic parkinsonism, dopaminergic neuron loss, substantia nigra pars compacta, neuroinflammation, microglial activation, astrocyte activation, protein aggregation, alpha-synuclein, neurodegeneration, olfactory bulb, entorhinal cortex, hippocampus, viral neuroinvasion, neurobehavioral abnormalities
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