Open AccessPlasma apolipoprotein J as a potential biomarker for Alzheimer's disease: Australian Imaging, Biomarkers and Lifestyle study of aging
Author(s) -
Gupta Veer Bala,
Doecke James D.,
Hone Eugene,
Pedrini Steve,
Laws Simon M.,
Thambisetty Madhav,
Bush Ashley I.,
Rowe Christopher C.,
Villemagne Victor L.,
Ames David,
Masters Colin L.,
Macaulay Stuart Lance,
Rembach Alan,
RaineySmith Stephanie R.,
Martins Ralph N.
Publication year - 2015
Publication title -
alzheimer's and dementia: diagnosis, assessment and disease monitoring
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.497
H-Index - 37
ISSN - 2352-8729
DOI - 10.1016/j.dadm.2015.12.001
Subject(s) - apolipoprotein e , biomarker , medicine , clusterin , alzheimer's disease , oncology , gastroenterology , positron emission tomography , endocrinology , pathology , disease , nuclear medicine , biology , apoptosis , biochemistry
For early detection of Alzheimer's disease (AD), the field needs biomarkers that can be used to detect disease status with high sensitivity and specificity. Apolipoprotein J (ApoJ, also known as clusterin) has long been associated with AD pathogenesis through various pathways. The aim of this study was to investigate the potential of plasma apoJ as a blood biomarker for AD. Methods Using the Australian Imaging, Biomarkers and Lifestyle (AIBL) study of aging, the present study assayed plasma apoJ levels over baseline and 18 months in 833 individuals. Plasma ApoJ levels were analyzed with respect to clinical classification, age, gender, apolipoprotein E ( APOE) ε4 allele status, mini‐mental state examination score, plasma amyloid beta (Aβ), neocortical Aβ burden (as measured by Pittsburgh compound B‐positron emission tomography), and total adjusted hippocampus volume. Results ApoJ was significantly higher in both mild cognitive impairment (MCI) and AD groups as compared with healthy controls (HC; P < .0001). ApoJ significantly correlated with both “standardized uptake value ratio” (SUVR) and hippocampus volume and weakly correlated with the plasma Aβ1–42/Aβ1–40 ratio. Plasma apoJ predicted both MCI and AD from HC with greater than 80% accuracy for AD and greater than 75% accuracy for MCI at both baseline and 18‐month time points. Discussion Mean apoJ levels were significantly higher in both MCI and AD groups. ApoJ was able to differentiate between HC with high SUVR and HC with low SUVR via APOE ε4 allele status, indicating that it may be included in a biomarker panel to identify AD before the onset of clinical symptoms.