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  • Title: Evolution of Abeta42 and Abeta40 levels and Abeta42/Abeta40 ratio in plasma during progression of Alzheimer's disease: a multicenter assessment.
    Author: Blennow K, De Meyer G, Hansson O, Minthon L, Wallin A, Zetterberg H, Lewczuk P, Vanderstichele H, Vanmechelen E, Kornhuber J, Wiltfang J, KND-Study Group, Heuser I, Maier W, Luckhaus C, Rüther E, Hüll M, Jahn H, Gertz HJ, Frölich L, Hampel H, Pernetzki R.
    Journal: J Nutr Health Aging; 2009 Mar; 13(3):205-8. PubMed ID: 19262954.
    Abstract:
    OBJECTIVE: To better understand the seemingly contradictory plasma beta-amyloid (Abeta) results in Alzheimer's disease (AD) patients by using a newly developed plasma Abeta assay, the INNO-BIA plasma Abeta forms, in a multicenter study. METHODS: A combined retrospective analysis of plasma Abeta isoforms on mild cognitive impairment (MCI) from three large cross-sectional studies involving 643 samples from the participating German and Swedish centers. RESULTS: Detection modules based on two different amino (N)-terminal specific Abeta monoclonal antibodies demonstrated that Abeta in plasma could be reliable quantified using a sandwich immunoassay technology with high precision, even for low Abeta42 plasma concentrations. Abeta40 and Abeta42 concentrations varied consistently with the ApoE genotype, while the Abeta42/Abeta40 ratio did not. Irrespective of the decrease of the Abeta42/Abeta40 ratio with age and MMSE, this parameter was strongly associated with AD, as defined in this study by elevated hyperphosphorylated (P-tau181P) levels in cerebrospinal fluid (CSF). CONCLUSION: A highly robust assay for repeatedly measuring Abeta forms in plasma such as INNO-BIA plasma Abeta forms might be a useful tool in a future risk assessment of AD.
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