title: Amyloid Beta-Weighted Cortical Thickness: A New Imaging Biomarker in Alzheimer's Disease.
abstract: Alzheimer's disease (AD) is the most common neurodegenerative disorder pathologically characterized by amyloid-beta (Aβ) plaques and neurofibrillary tangles. The aggregation of Aβ precedes tau pathologies in AD; however, the causal relation between the two pathologies and the mechanisms by which aggregated forms of Aβ contribute to cortical thinning are not fully understood. We proposed quantitative Aβ-weighted cortical thickness analysis to investigate the regional relationship between cortical thinning and amyloid plaque deposition using magnetic resonance (MR) and Pittsburg Compound B (PiB) positron emission tomography (PET) images in patients with AD, mild cognitive impairment (MCI), and subjects with normal cognition. We hypothesized that there are cortical areas that have prominent changes associated with Aβ deposition and there are areas that are relatively independent from Aβ deposition where pathologies other than Aβ (such as tau) are predominant. The study was performed using MRI and PiB PET data from the Alzheimer's Disease Neuroimaging Initiative. We measured accuracy of classification models in three different pairs of groups comparing AD, MCI, and normal cognition. Classification models that used Aβ-weighted cortical thickness were not inferior to classification models that used only cortical thickness or amyloid deposition. In addition, based on timing of changes in cortical thinning and Aβ deposition such as Aβ deposition after cortical thinning; cortical thinning after Aβ deposition, or concurrent Aβ deposition and cortical thinning, we identified three types of relationships between cortical thinning and Aβ deposition: (1) Aβ-associated cortical thinning; (2) Aβ-independent cortical thinning; and (3) Aβ deposition only without cortical thinning. Taken together, these findings suggest that Aβ-weighted cortical thickness values can be used as an objective biomarker of structural changes caused by amyloid pathology in the brain.
authors.forename: Chan Mi
authors.initials: CM
authors.lastname: Kim
authors.forename: Jihye
authors.initials: J
authors.lastname: Hwang
authors.forename: Jong-Min
authors.initials: JM
authors.lastname: Lee
authors.forename: Jee Hoon
authors.initials: JH
authors.lastname: Roh
authors.affiliation: Department of Neurology, Asan Medical Center, University of Ulsan College of Medicine, 88 Olympic- ro 43-gil, Songpa-gu, Seoul 138-736, Korea. jhlee@amc.seoul.kr.
authors.forename: Jae-Hong
authors.initials: JH
authors.lastname: Lee
authors.forename: Jae-Young
authors.initials: JY
authors.lastname: Koh
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000000981:diagnostic imaging / Q000378:metabolism* / Q000473:pathology*; D016229:Amyloid beta-Peptides / Q000378:metabolism*; D000814:Aniline Compounds / Q000378:metabolism; D015415:Biomarkers; D001931:Brain Mapping; D002540:Cerebral Cortex / Q000000981:diagnostic imaging / Q000473:pathology*; D060825:Cognitive Dysfunction / Q000000981:diagnostic imaging / Q000378:metabolism / Q000473:pathology; D005260:Female; D006801:Humans; D007091:Image Processing, Computer-Assisted; D008279:Magnetic Resonance Imaging; D008297:Male; D016874:Neurofibrillary Tangles / Q000473:pathology*; D049268:Positron-Emission Tomography; D013844:Thiazoles / Q000378:metabolism
chemical_list: C475519:2-(4'-(methylamino)phenyl)-6-hydroxybenzothiazole; D016229:Amyloid beta-Peptides; D000814:Aniline Compounds; D015415:Biomarkers; D013844:Thiazoles