Abstract
The α-synuclein-immunoreactive pathology of dementia associated with Parkinson disease (DPD) comprises Lewy bodies (LB), Lewy neurites (LN), and Lewy grains (LG). The densities of LB, LN, LG together with vacuoles, neurons, abnormally enlarged neurons (EN), and glial cell nuclei were measured in fifteen cases of DPD. Densities of LN and LG were up to 19 and 70 times those of LB, respectively, depending on region. Densities were significantly greater in amygdala, entorhinal cortex (EC), and sectors CA2/CA3 of the hippocampus, whereas middle frontal gyrus, sector CA1, and dentate gyrus were least affected. Low densities of vacuoles and EN were recorded in most regions. There were differences in the numerical density of neurons between regions, but no statistical difference between patients and controls. In the cortex, the density of LB and vacuoles was similar in upper and lower laminae, while the densities of LN and LG were greater in upper cortex. The densities of LB, LN, and LG were positively correlated. Principal components analysis suggested that DPD cases were heterogeneous with pathology primarily affecting either hippocampus or cortex. The data suggest in DPD: (1) ratio of LN and LG to LB varies between regions, (2) low densities of vacuoles and EN are present in most brain regions, (3) degeneration occurs across cortical laminae, upper laminae being particularly affected, (4) LB, LN and LG may represent degeneration of the same neurons, and (5) disease heterogeneity may result from variation in anatomical pathway affected by cell-to-cell transfer of α-synuclein.
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Abbreviations
- Aβ:
-
β-Amyloid
- AD:
-
Alzheimer’s disease
- AG:
-
Argyrophilic grains
- AGD:
-
Argyrophilic grain disease
- ANOVA:
-
Analysis of variance
- CA:
-
Cornu Ammonis
- CERAD:
-
Consortium to establish a registry of Alzheimer’s disease
- CG:
-
Cingulate gyrus
- DLB:
-
Dementia with Lewy bodies
- DPD:
-
Dementia associated with Parkinson’s disease
- EC:
-
Entorhinal cortex
- EN:
-
Abnormally enlarged neurons
- LB:
-
Lewy bodies
- LN:
-
Lewy neurites
- LG:
-
Lewy grains
- MFG:
-
Middle frontal gyrus
- MSA:
-
Multiple system atrophy
- NCI:
-
Neuronal cytoplasmic inclusion
- NIA:
-
National Institute on Aging
- PC:
-
Principal component
- PCA:
-
Principal components analysis
- PD:
-
Parkinson’s disease
- pTDP-43:
-
Phosphorylated TDP-43
- PHG:
-
Parahippocampal gyrus
- SN:
-
Substantia nigra
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Acknowledgments
We thank Deborah Carter, Toral Patel, and Lisa Taylor-Reinwald of the Betty Martz Laboratory for Neurodegenerative Research for expert assistance and we thank the families of patients whose generosity made this research possible. Support for this work was provided by grants from the National Institute on Aging of the National Institutes of Health (P50-AG05681, P01-AG03991), National Institute of Neurologic Diseases and Stroke (NS075321, NS41509, NS058714), NIH (ULITR000488), the Hope Center for Neurological Disorders, the Buchanan Fund, the Charles F. & Joanne Knight Alzheimer’s Disease Research Center, the American Parkinson Disease Association (APDA) Advanced Research Centre for Parkinson Disease at Washington University in St Louis, The Greater St Louis Chapter of the APDA, the McDonnell Center for Molecular and Cellular Neurobiology, and the Barnes-Jewish Foundation (Elliot-Stein Family Fund and Parkinson Disease Research Fund).
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Armstrong, R.A., Kotzbauer, P.T., Perlmutter, J.S. et al. A quantitative study of α-synuclein pathology in fifteen cases of dementia associated with Parkinson disease. J Neural Transm 121, 171–181 (2014). https://doi.org/10.1007/s00702-013-1084-z
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DOI: https://doi.org/10.1007/s00702-013-1084-z