Amyloid-beta-42 oligomerization

Class

D-amino-acid amyloid-beta-42 oligomerization inhibitor

Amyloid-beta-42 (Aβ42) is a small protein fragment produced when a larger protein called amyloid precursor protein is cut by two enzymes, beta- and gamma-secretase. Normally Aβ42 exists as single molecules that are cleared from the brain, but it has a natural tendency to stick to itself, first forming small clusters called oligomers and eventually larger fibrils that make up amyloid plaques. Research on Alzheimer's disease suggests that the soluble oligomers, more than the plaques themselves, are especially damaging to synapses, the junctions where nerve cells communicate, and may set off further injury including inflammation and abnormal tau protein buildup. Molecules designed to block Aβ42 oligomerization aim to interrupt this early clustering step before toxic intermediates accumulate, rather than breaking apart plaques that have already formed. One approach uses short peptides built from D-amino acids, mirror-image versions of the amino acids that make up natural proteins, which can bind Aβ42 and interfere with its self-assembly while being more resistant to breakdown by the body's protein-cutting enzymes. This mechanism is studied mainly in Alzheimer's disease and other brain disorders where amyloid-beta accumulation is thought to be an early driver of nerve cell damage.