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Pathogenesis

Neurodegeneration Precedes Plaque Formation

Published in Gene Therapy Weekly, May 31st, 1999

Brain damage from Alzheimer's disease (AD) precedes formation of amyloid plaques in a transgenic mouse model of familial AD.

Extracellular A(beta) amyloid deposits known as senile plaques are the distinguishing feature of AD. It once seemed clear that these plaques caused AD symptoms; indeed, several candidate AD drugs aim to dissolve them.

But evidence is accumulating that plaque formation is poorly correlated with neuronal loss and disease severity. Now De-Hua Chui of Japan's National Institute of Neuroscience and colleagues have shown in a mouse model that AD pathogenesis is already well under way by the time of plaque formation.

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