Two Disaccharides and Trimethylamine N-oxide Affect Abeta Aggregation Differently, but All Attenuate Oligomer-induced Membrane Permeability

Overview

Journal Biochemistry

Specialty Biochemistry

Date 2009 Jul 30

PMID 19637920

Citations 15

Authors

Wei Qi

Aming Zhang

Theresa A Good

Erik J Fernandez

Affiliations

Soon will be listed here.

Abstract

Interaction between aggregates of amyloid beta protein (Abeta) and membranes has been hypothesized by many to be a key event in the mechanism of neurotoxicity associated with Alzheimer's disease (AD). Proposed membrane-related mechanisms of neurotoxicity include ion channel formation, membrane disruption, changes in membrane capacitance, and lipid membrane oxidation. Recently, osmolytes such as trehalose have been found to delay Abeta aggregation in vitro and reduce neurotoxicity. However, no direct measurements have separated the effects of osmolytes on Abeta aggregation versus membrane interactions. In this article, we tested the influence of trehalose, sucrose and trimethylamine-N-oxide (TMAO) on Abeta aggregation and fluorescent dye leakage induced by Abeta aggregates from liposomes. In the absence of lipid vesicles, trehalose and sucrose, but not TMAO, were found to delay Abeta aggregation. In contrast, all of the osmolytes significantly attenuated dye leakage. Dissolution of preformed Abeta aggregates was excluded as a possible mechanism of dye leakage attenuation by measurements of Congo red binding as well as hydrogen-deuterium exchange detected by mass spectrometry (HX-MS). However, the accelerated conversion of high order oligomers to fibril caused by vesicles did not take place if any of the three osmolytes presented. Instead, in the case of disaccharide, osmolytes were found to form adducts with Abeta, and change the dissociation dynamics of soluble oligomeric species. Both effects may have contributed to the observed osmolyte attenuation of dye leakage. These results suggest that disaccharides and TMAO may have very different effects on Abeta aggregation because of the different tendencies of the osmolytes to interact with the peptide backbone. However, the effects on Abeta membrane interaction may be due to much more general phenomena associated with osmolyte enhancement of Abeta oligomer stability and/or direct interaction of osmolyte with the membrane surface.

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