Isolation and analysis of amyloid-β 1-42 monomer and oligomers in liquid droplets using an immunoaffinity membrane

Monomeric molecules such as amyloid-beta can aggregate and transform into oligomeric and fibrous forms, which are implicated in the development and progression of Alzheimer's disease. Novel analytical techniques for the formation of oligomers are required to examine the neurotoxic amyloid-beta oligomers involving fibrils. After isolating amyloid-beta monomer 1-42 using a biotinylated antibody bound to membrane-immobilized avidin (immunoaffinity membrane), their masses were determined by MALDI-TOF MS. Fluorometric determination of more than 0.5 mu M of aggregated amyloid-beta in pipette droplets was performed after aggregation and dilution of 1 mM amyloid-beta. Thus, large (>105 nm) amyloid-beta oligomers in microliter volumes of fluids were isolated using the immunoaffinity membrane and quantitatively analyzed after removal of amyloid-beta monomers and small oligomers by non-denaturing electrophoresis. In addition, amyloid-beta oligomers were specifically isolated from a mixture of human plasma and aggregated amyloid-beta and then fluorometrically analyzed. Our results show that the combination of immunoaffinity membrane-binding and fluorescence determinations together with one drop analysis could be used to isolate and detect huge neurotoxic amyloid-beta oligomers such as fibrils in plasma samples. (C) 2014 Elsevier B.V. All rights reserved.