title: High density lipoproteins bind Abeta and apolipoprotein C-II amyloid fibrils.
abstract: Disease-associated amyloid deposits contain both fibrillar and nonfibrillar components. The majority of these amyloid components originate or coexist in the bloodstream. To understand the nature of the interaction between the nonfibrillar and fibrillar components, we have developed a centrifugation method to isolate fibril binding proteins from human serum. Amyloid fibrils composed of either Abeta peptide or apolipoprotein C-II (apoC-II) cosedimented with specific serum proteins. Gel electrophoresis, mass spectrometry peptide fingerprinting, and Western analysis identified the major binding species as proteins found in HDL particles, including apoA-I, apoA-II, apoE, clusterin, and serum amyloid A. Sedimentation analysis showed that purified human HDL and recombinant apoA-I lipid particles bound directly to Abeta and apoC-II amyloid fibrils. These studies reveal a novel function of HDL that may contribute to the well-established protective effect of this lipoprotein class in heart disease.
authors.affiliation: Department of Biochemistry and Molecular Biology, Bio21 Molecular Science and Biotechnology Institute, University of Melbourne, Parkville, Victoria 3010, Australia.
authors.forename: Leanne M
authors.initials: LM
authors.lastname: Wilson
authors.forename: Chi L L
authors.initials: CL
authors.lastname: Pham
authors.forename: Alicia J
authors.initials: AJ
authors.lastname: Jenkins
authors.forename: John D
authors.initials: JD
authors.lastname: Wade
authors.forename: Andrew F
authors.initials: AF
authors.lastname: Hill
authors.forename: Matthew A
authors.initials: MA
authors.lastname: Perugini
authors.forename: Geoffrey J
authors.initials: GJ
authors.lastname: Howlett
mesh_terms: D000682:Amyloid / Q000737:chemistry / Q000378:metabolism; D016229:Amyloid beta-Peptides / Q000737:chemistry / Q000378:metabolism*; D053304:Apolipoprotein C-II; D001056:Apolipoproteins C / Q000737:chemistry / Q000378:metabolism; D002498:Centrifugation / Q000379:methods*; D006801:Humans; D008075:Lipoproteins, HDL / Q000737:chemistry / Q000378:metabolism*; D044967:Serum / Q000737:chemistry
chemical_list: D000682:Amyloid; D016229:Amyloid beta-Peptides; D053304:Apolipoprotein C-II; D001056:Apolipoproteins C; D008075:Lipoproteins, HDL