Revisiting protein aggregation as pathogenic in sporadic Parkinson and Alzheimer diseases
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Abstract
The gold standard for a definitive diagnosis of Parkinson disease (PD) is the pathologic finding of aggregated α-synuclein into Lewy bodies and for Alzheimer disease (AD) aggregated amyloid into plaques and hyperphosphorylated tau into tangles. Implicit in this clinicopathologic-based nosology is the assumption that pathologic protein aggregation at autopsy reflects pathogenesis at disease onset. While these aggregates may in exceptional cases be on a causal pathway in humans (e.g., aggregated α-synuclein in SNCA gene multiplication or aggregated β-amyloid in APP mutations), their near universality at postmortem in sporadic PD and AD suggests they may alternatively represent common outcomes from upstream mechanisms or compensatory responses to cellular stress in order to delay cell death. These 3 conceptual frameworks of protein aggregation (pathogenic, epiphenomenon, protective) are difficult to resolve because of the inability to probe brain tissue in real time. Whereas animal models, in which neither PD nor AD occur in natural states, consistently support a pathogenic role of protein aggregation, indirect evidence from human studies does not. We hypothesize that (1) current biomarkers of protein aggregates may be relevant to common pathology but not to subgroup pathogenesis and (2) disease-modifying treatments targeting oligomers or fibrils might be futile or deleterious because these proteins are epiphenomena or protective in the human brain under molecular stress. Future precision medicine efforts for molecular targeting of neurodegenerative diseases may require analyses not anchored on current clinicopathologic criteria but instead on biological signals generated from large deeply phenotyped aging populations or from smaller but well-defined genetic–molecular cohorts.
Glossary
- Aβ=
- β-amyloid;
- AD=
- Alzheimer disease;
- DLB=
- dementia with Lewy bodies;
- PD=
- Parkinson disease
Footnotes
Go to Neurology.org/N for full disclosures. Funding information and disclosures deemed relevant by the authors, if any, are provided at the end of the article.
- Received July 6, 2018.
- Accepted in final form December 14, 2018.
- © 2019 American Academy of Neurology
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Letters: Rapid online correspondence
- Author response to Dr. Nelson: Revisiting protein aggregation as pathogenic in sporadic Parkinson and Alzheimer diseases
- Alberto J. Espay, Neurologist, University of Cincinnati
- Joaquin A. Vizcarra, Neurologist, University of Cincinnati
- Luca Marsili, Neurologist, University of Cincinnati
- Anthony E. Lang, Neurologist, University of Toronto
- S. Pablo Sardi, Neuroscientist, Sanofi Pharmaceuticals
- James B. Leverenz, Neurologist, Cleveland Clinic Foundation
Submitted March 22, 2019 - Reader response: Revisiting protein aggregation as pathogenic in sporadic Parkinson and Alzheimer diseases
- Peter T. Nelson, Neuropathologist, University of Kentucky
Submitted February 15, 2019
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