Novel plasma biomarker surrogating cerebral amyloid deposition.
Alzheimer's disease (AD) is the most common and devastating dementia. Simple and practical biomarkers for AD are urgently required for accurate diagnosis and to facilitate the development of disease-modifying interventions. The subjects for the study were selected on the basis of PiB amyloid imaging by PET. Forty PiB-positive (PiB+) individuals, including cognitively healthy controls (HC), and mild cognitive impairment and AD individuals, and 22 PiB-negative (PiB-) HC participated. Employing our novel highly sensitive immunoprecipitation-mass spectrometry, we measured plasma amyloid β-proteins (Aβs; Aβ1-40 and Aβ1-42) and Aβ-approximate peptides (AβAPs), which were cleaved from amyloid precursor protein (APP). Among the AβAPs, APP669-711 appeared to be a good reference for deciphering pathological change of Aβ1-42. We evaluated the performance of the ratio of APP669-711 to Aβ1-42 (APP669-711/Aβ1-42) as a biomarker. APP669-711/Aβ1-42 significantly increased in the PiB+ groups. The sensitivity and specificity to discriminate PiB+ individuals from PiB- individuals were 0.925 and 0.955, respectively. Our plasma biomarker precisely surrogates cerebral amyloid deposition.
Koichi Tanaka Laboratory of Advanced Science and Technology, Shimadzu Corporation.
Naoki
N
Kaneko
Akinori
A
Nakamura
Yukihiko
Y
Washimi
Takashi
T
Kato
Takashi
T
Sakurai
Yutaka
Y
Arahata
Masahiko
M
Bundo
Akinori
A
Takeda
Shumpei
S
Niida
Kengo
K
Ito
Kenji
K
Toba
Koichi
K
Tanaka
Katsuhiko
K
Yanagisawa
D000368:Aged; D000369:Aged, 80 and over; D000544:Alzheimer Disease / Q000097:blood*; D016229:Amyloid beta-Peptides / Q000097:blood*; D015415:Biomarkers / Q000097:blood*; D005260:Female; D006801:Humans; D047468:Immunoprecipitation; D008279:Magnetic Resonance Imaging; D008297:Male; D013058:Mass Spectrometry; D049268:Positron-Emission Tomography; D012372:ROC Curve; D015203:Reproducibility of Results
D016229:Amyloid beta-Peptides; D015415:Biomarkers