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Interactive versus additive relationships between regional cortical thinning and amyloid burden in predicting clinical decline in mild AD and MCI individuals
- Source :
- NeuroImage: Clinical, Vol 17, Iss, Pp 388-396 (2018), NeuroImage: Clinical, Vol. 17, p. 388-396 (2018), NeuroImage : Clinical
- Publication Year :
- 2018
- Publisher :
- Elsevier, 2018.
-
Abstract
- The biological mechanisms that link Beta-amyloid (Aβ) plaque deposition, neurodegeneration, and clinical decline in Alzheimer's disease (AD) dementia, have not been completely elucidated. Here we studied whether amyloid accumulation and neurodegeneration, independently or interactively, predict clinical decline over time in a group of memory impaired older individuals [diagnosed with either amnestic mild cognitive impairment (MCI), or mild AD dementia]. We found that baseline Aβ-associated cortical thinning across clusters encompassing lateral and medial temporal and parietal cortices was related to higher baseline Clinical Dementia Rating Sum-of-Boxes (CDR-SB). Baseline Aβ-associated cortical thinning also predicted CDR-SB over time. Notably, the association between CDR-SB change and cortical thickness values from the right lateral temporo-parietal cortex and right precuneus was driven by individuals with high Aβ burden. In contrast, the association between cortical thickness in the medial temporal lobe (MTL) and clinical decline was similar for individuals with high or low Aβ burden. Furthermore, amyloid pathology was a stronger predictor for clinical decline than MTL thickness. While this study validates previous findings relating AD biomarkers of neurodegeneration to clinical impairment, here we show that regions outside the MTL may be more vulnerable and specific to AD dementia. Additionally, excluding mild AD individuals revealed that these relationships remained, suggesting that lower cortical thickness values in specific regions, vulnerable to amyloid pathology, predict clinical decline already at the prodromal stage.<br />Highlights • Aβ burden is associated with cortical thinning in a pattern consistent with AD. • Interaction between Aβ and neocortical thinning predicts clinical decline. • MTL thickness predicts clinical decline regardless of Aβ burden. • Amyloid pathology is a stronger predictor for clinical decline than MTL thickness.
- Subjects :
- Male
0301 basic medicine
Amyloid
Clinical Dementia Rating
Cognitive Neuroscience
Disease
Beta-amyloid
lcsh:Computer applications to medicine. Medical informatics
Severity of Illness Index
lcsh:RC346-429
Cortical thickness
Temporal lobe
03 medical and health sciences
0302 clinical medicine
Alzheimer Disease
Cortex (anatomy)
mental disorders
medicine
Humans
Dementia
Cognitive Dysfunction
Radiology, Nuclear Medicine and imaging
lcsh:Neurology. Diseases of the nervous system
Aged
Cerebral Cortex
Amyloid beta-Peptides
Neurodegeneration
Prodromal Stage
Mild cognitive impairment
Regular Article
Alzheimer's disease
medicine.disease
Magnetic Resonance Imaging
030104 developmental biology
medicine.anatomical_structure
Neurology
Positron-Emission Tomography
Medial temporal lobe
Disease Progression
lcsh:R858-859.7
Female
Neurology (clinical)
Psychology
Neuroscience
030217 neurology & neurosurgery
Clinical decline
Subjects
Details
- Language :
- English
- ISSN :
- 22131582
- Volume :
- 17
- Database :
- OpenAIRE
- Journal :
- NeuroImage: Clinical
- Accession number :
- edsair.doi.dedup.....bcce1e0ed98a6105c87125b6f8963b89