title: Surface plasmon resonance for the label-free detection of Alzheimer's β-amyloid peptide aggregation.
abstract: Amyloid peptide oligomers and fibrils are studied as targets for therapy and diagnosis of Alzheimer's disease. They are usually detected by amyloid incubation, but such method is necessarily associated with Aβ1-42 depletion and dye binding or conjugation, which have a complex influence on fibril growth, provide information about fibril elongation over long time periods only, and might lead to false-positive results in amyloid inhibition assay. Surface plasmon resonance (SPR) is used to study with no labelling and in real time the aggregation of Aβ1-42 amyloid on specific antibodies. SPR data show, for the first time by using SPR, a multi-phase association behavior for Aβ1-42 oligomers accounting for a sigmoidal growth of amyloid as a function of time, with two antibody-dependent aggregation patterns. The new method represents an advantageous alternative to traditional procedures for investigating amyloid self-assembly and inhibition from early-stage oligomer association, on the time scale of seconds to minutes, to long-term polymerization, on the time scale of hours to days.
authors.affiliation: Consorzio Interuniversitario Istituto Nazionale Biostrutture e Biosistemi (I.N.B.B.), Viale delle Medaglie D'Oro 305, 00136, Rome, Italy.
authors.forename: Pasquale
authors.initials: P
authors.lastname: Palladino
authors.affiliation: Dipartimento di Scienze Chimiche, Università di Catania, Viale Andrea Doria 6, 95125, Catania, Italy.
authors.forename: Angela M
authors.initials: AM
authors.lastname: Aura
authors.affiliation: Consorzio Interuniversitario Istituto Nazionale Biostrutture e Biosistemi (I.N.B.B.), Viale delle Medaglie D'Oro 305, 00136, Rome, Italy. gspoto@unict.it.|Dipartimento di Scienze Chimiche, Università di Catania, Viale Andrea Doria 6, 95125, Catania, Italy. gspoto@unict.it.
authors.forename: Giuseppe
authors.initials: G
authors.lastname: Spoto
mesh_terms: D000544:Alzheimer Disease / Q000378:metabolism*; D016229:Amyloid beta-Peptides / Q000737:chemistry* / Q000378:metabolism; D006801:Humans; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D016229:Amyloid beta-Peptides
keywords: Alzheimer’s disease; Amyloid beta-peptides; Biosensors; Real-time detection; Surface plasmon resonance