Association of Cortical β-Amyloid Protein in the Absence of Insoluble Deposits With Alzheimer Disease
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View abstract on PubMed
Summary
This summary is machine-generated.Soluble beta-amyloid protein, even without deposits, accelerates cognitive decline in processing speed and visuospatial abilities. This suggests a neurotoxic role in aging, distinct from typical Alzheimer
Area Of Science
- Neurology
- Neuroscience
- Gerontology
Background
- Beta-amyloid (Aβ) deposits are a hallmark of Alzheimer's disease (AD).
- The role of soluble Aβ protein in cognitive decline, independent of Aβ deposits, remains unclear.
- Understanding Aβ's impact is crucial for diagnosing and treating age-related cognitive impairment.
Purpose Of The Study
- To investigate the association between cortical Aβ protein and cognitive decline.
- To examine relationships with neurofibrillary tangles, other neuropathologies, and APOE genotype in the absence of Aβ deposits.
- To clarify the neurotoxic potential of soluble Aβ in the aging brain.
Main Methods
- Analysis of data from two community-based clinicopathologic cohort studies (Religious Orders Study and Rush Memory and Aging Project).
- Targeted proteomics measured Aβ protein abundance; immunohistochemistry detected Aβ deposits.
- Linear mixed models and regression analyses assessed associations with cognitive decline and neuropathologic outcomes.
Main Results
- In individuals without Aβ deposits, Aβ protein was linked to faster decline in processing speed and visuospatial abilities.
- No association was found with episodic memory decline or paired helical filament tau tangle density.
- Aβ protein correlated with amyloid angiopathy but not other brain pathologies.
Conclusions
- Cortical soluble Aβ protein is associated with accelerated cognitive decline, even without Aβ deposits, suggesting a neurotoxic role in aging.
- The findings indicate a neuropathologic pathway potentially distinct from typical Alzheimer's disease.
- Further research is needed to elucidate the specific mechanisms of soluble Aβ neurotoxicity.
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