An intracellular protein that binds amyloid-β peptide and mediates neurotoxicity in Alzheimer's disease

Amyloid-β is a neurotoxic peptide which is implicated in the pathogenesis of Alzheimer's disease. It binds an intracellular polypeptide known as ERAB, thought to be a hydroxysteroid dehydrogenase enzyme, which is expressed in normal tissues, but is overexpressed in neurons affected in Alzheimer's disease. ERAB immunoprecipitates with amyloid-β, and when cell cultures are exposed to amyloid-β, ERAB inside the cell is rapidly redistributed to the plasma membrane. The toxic effect of amyloid-β on these cells is prevented by blocking ERAB and is enhanced by overexpression of ERAB. By interacting with intracellular amyloid-β, ERAB may therefore contribute to the neuronal dysfunction associated with Alzheimer's disease.

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