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Paradoxical Alzheimer's finding may shed new light on memory loss
Date:3/12/2008

March 8, 2008 Do you remember the seventh song that played on your radio on the way to work yesterday? Most of us dont, thanks to a normal forgetting process that is constantly cleaning house culling inconsequential information from our brains. Researchers at the Buck Institute now believe that this normal memory loss is hyper-activated in Alzheimers disease (AD) and that this effect is key to the profound memory loss associated with the incurable neurodegenerative disorder.

Last year, this same group of researchers found that they could completely prevent Alzheimers disease in mice genetically engineered with a human Alzheimers geneMouzheimersby blocking a single site of cleavage of one molecule, called APP for amyloid precursor protein. Normally, this site on APP is attacked by molecular scissors called caspases, but blocking that process prevented the disease. Now they have studied human brain tissue and found that, just as expected, patients suffering from AD clearly show more of this cleavage process than people of the same age who do not have the disease. However, when they extended their studies to much younger people without Alzheimers disease, they were astonished to find an apparent paradox: these younger people displayed as much as ten times the amount of the same cleavage event as the AD patients. The researchers now believe they know why.

The Buck Institute study implicates a biochemical switch associated with that cleavage of APP, causing AD brains to become stuck in the process of breaking memories, and points to AD as a syndrome affecting the plasticity or malleability of the brain. The study, due to be published in the March 7 issue of the Journal of Alzheimers Disease, provides new insight into a molecular event resulting in decreased brain plasticity, a central feature of AD.

Young brains operate like Ferraris shifting between forward and reverse, making and breaking memories with a facility that surpasses that
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Contact: Kris Rebillot
krebillot@buckinstitute.org
415-209-2080
IOS Press
Source:Eurekalert

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