Early Selective Vulnerability of the CA2 Hippocampal Subfield in Primary Age-Related Tauopathy.
J Neuropathol Exp Neurol
; 80(2): 102-111, 2021 01 20.
Article
in En
| MEDLINE
| ID: mdl-33367843
Primary age-related tauopathy (PART) is a neurodegenerative entity defined as Alzheimer-type neurofibrillary degeneration primarily affecting the medial temporal lobe with minimal to absent amyloid-ß (Aß) plaque deposition. The extent to which PART can be differentiated pathoanatomically from Alzheimer disease (AD) is unclear. Here, we examined the regional distribution of tau pathology in a large cohort of postmortem brains (n = 914). We found an early vulnerability of the CA2 subregion of the hippocampus to neurofibrillary degeneration in PART, and semiquantitative assessment of neurofibrillary degeneration in CA2 was significantly greater than in CA1 in PART. In contrast, subjects harboring intermediate-to-high AD neuropathologic change (ADNC) displayed relative sparing of CA2 until later stages of their disease course. In addition, the CA2/CA1 ratio of neurofibrillary degeneration in PART was significantly higher than in subjects with intermediate-to-high ADNC burden. Furthermore, the distribution of tau pathology in PART diverges from the Braak NFT staging system and Braak stage does not correlate with cognitive function in PART as it does in individuals with intermediate-to-high ADNC. These findings highlight the need for a better understanding of the contribution of PART to cognitive impairment and how neurofibrillary degeneration interacts with Aß pathology in AD and PART.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Aging
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Tauopathies
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CA2 Region, Hippocampal
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Neurons
Limits:
Aged
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Aged80
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Female
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Humans
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Male
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Middle aged
Language:
En
Journal:
J Neuropathol Exp Neurol
Year:
2021
Document type:
Article
Affiliation country:
Country of publication: