amyloid-beta-peptides and Hemolysis

amyloid-beta-peptides has been researched along with Hemolysis* in 2 studies

Other Studies

2 other study(ies) available for amyloid-beta-peptides and Hemolysis

ArticleYear
Amyloid β-induced erythrocytic damage and its attenuation by carotenoids.
    FEBS letters, 2011, Apr-20, Volume: 585, Issue:8

    The presence of amyloid β-peptide (Aβ) in human blood has recently been established, and it has been hypothesized that Aβ readily contacts red blood cells (RBC) and oxidatively impairs RBC functions. In this study, we conducted in vitro and in vivo studies, which provide evidence that Aβ induces oxidative injury to RBC by binding to them, causing RBC phospholipid peroxidation and diminishing RBC endogenous carotenoids, especially xanthophylls. This type of damage is likely to injure the vasculature, potentially reducing oxygen delivery to the brain and facilitating Alzheimer's disease (AD). As a preventive strategy, because the Aβ-induced RBC damage could be attenuated by treatment of RBC with xanthophylls, we suggest that xanthophylls may contribute to the prevention of AD.

    Topics: Amyloid beta-Peptides; Animals; Antioxidants; Carotenoids; Erythrocytes; Flow Cytometry; Hemolysis; Humans; Lipid Peroxides; Lutein; Male; Mice; Mice, Inbred C57BL; Oxidation-Reduction; Oxidative Stress; Peptide Fragments; Phospholipids; Protein Binding; Xanthophylls

2011
Electrochemical and conformational consequences of copper (Cu(I) and Cu(II)) binding to beta-amyloid(1-40).
    Chembiochem : a European journal of chemical biology, 2009, Apr-17, Volume: 10, Issue:6

    Copper-induced structural rearrangements of Abeta40 structure and its redox properties are described in this study. Electrochemical and fluorescent methods are used to characterise the behaviour of Abeta-Cu species. The data suggest that time-dependent folding of Abeta-Cu species may cause changes in the redox potentials.Extracellular deposits of beta-amyloid (Abeta) into senile plaques are the major features observed in brains of Alzheimer's disease (AD) patients. A high concentration of copper has been associated with insoluble amyloid plaques. It is known that Abeta(1-40) can bind copper with high affinity, but electrochemical properties of Abeta(1-40)-Cu complexes are not well-characterised. In this study we demonstrate that complexation of copper (both as Cu(I) and Cu(II)) by Abeta(1-40) reduces the metal electrochemical activity. Formation of copper-Abeta(1-40) complexes is associated with alteration of the redox potential. The data reveal significant redox activity of fresh Abeta-copper solutions. However, copper-induced structural rearrangements of the peptide, documented by CD, correspond with time-dependent changes of formal reduction potentials (E(0')) of the complex. Fluorescent and electrochemical (cyclic voltammetry and differential pulse voltammetry) techniques suggest that reduction of the redox activity by Abeta-Cu complexes could be attributed to conformational changes that diminished copper accessibility to the external environment. According to our evidence, conformational rearrangements, induced by copper binding to amyloid, elongate the time necessary to attain the same beta-sheet content as for the metal-free peptide. Although the redox activity of Abeta-Cu complexes diminishes in a time-dependent manner, they are not completely devoid of toxicity as they destabilize red blood cells osmotic fragility, even after prolonged incubation.

    Topics: Adult; Amyloid beta-Peptides; Cell Membrane; Copper; Electrochemistry; Erythrocytes; Fluorescent Dyes; Hemolysis; Humans; Hydrophobic and Hydrophilic Interactions; Oxidation-Reduction; Peptide Fragments; Protein Structure, Secondary; Solubility; Time Factors

2009
chemdatabank.com