Metal binding to the amyloid-beta peptides in the presence of biomembranes : potential mechanisms of cell toxicity

• The amyloid-beta (A beta) peptides are key molecules in Alzheimer's disease (AD) pathology. They interact with cellular membranes, and can bind metal ions outside the membrane. Certain oligomeric A beta aggregates are known to induce membrane perturbations and the structure of these oligomers-and their membrane-perturbing effects-can be modulated by metal ion binding. If the bound metal ions are redox active, as e.g., Cu and Fe ions are, they will generate harmful reactive oxygen species (ROS) just outside the membrane surface. Thus, the membrane damage incurred by toxic A beta oligomers is likely aggravated when redox-active metal ions are present. The combined interactions between A beta oligomers, metal ions, and biomembranes may be responsible for at least some of the neuronal death in AD patients.

Ämnesord

NATURVETENSKAP  -- Biologi (hsv//swe)

NATURAL SCIENCES  -- Biological Sciences (hsv//eng)

NATURVETENSKAP  -- Kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)

Nyckelord

Amyloid-beta peptide

Phospholipid membrane

Redox-active metal ion

Cytotoxicity

Amyloid disease

Membrane pore

Reactive oxygen species

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