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Title: Nanoparticles and amyloid systems: A fatal encounter?

Nanoparticles (NPs) are used in many products of our daily life, however, there has been concern that they may also be harmful to human health. Recently NPs have been found to accelerate the fibrillation kinetics of amyloid systems. In the past this has been preliminarily attributed to a nucleation effect. Nanoparticle surfaces and interfaces appear to limit the degrees of freedom of amyloid systems (i.e., peptides and proteins) due to a phase space constraint such that rapid cross-beta structures are formed faster than without interface interactions and in turn fibril formation is enhanced significantly. Here we explore if lipid bilayers in the form of liposomes (140nm) also accelerate fibril formation for amyloid systems. We have investigated a fragment NNFGAIL of the Human islet amyloid polypeptide (hIAPP) in contact with 1,2-diphytanoyl-sn-glycero-3-phosphocholine (DPhPC) liposomes in aqueous solution. We found that the lipid bilayer vesicles do accelerate fibril formation in time-resolved off-line detected atomic force microscopy experiments. Characteristic Thioflavine-T fluorescence on the same structures verify that the structures consist of aggregated peptides in a typical cross-╬▓-structure arrangement.
Authors:
 [1]
  1. Leibniz Institute of Surface Modification, Chemical Department, Permoserstr. 15, D-04318 Leipzig, Germany and Wilhelm-Ostwald-Institute for Physical and Theoretical Chemistry, Linn├ęstr. 3, D-04103 Leipzig (Germany)
Publication Date:
OSTI Identifier:
22307918
Resource Type:
Journal Article
Resource Relation:
Journal Name: AIP Conference Proceedings; Journal Volume: 1618; Journal Issue: 1; Conference: ICCMSE 2014: International conference on computational methods in science and engineering 2014, Athens (Greece), 4-7 Apr 2014; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; AQUEOUS SOLUTIONS; ATOMIC FORCE MICROSCOPY; DEGREES OF FREEDOM; FLUORESCENCE; INTERFACES; LAYERS; LIPIDS; LIPOSOMES; NANOPARTICLES; NUCLEATION; PHASE SPACE; POLYPEPTIDES; SURFACES; TIME RESOLUTION