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Neuroimaging study may pave way for effective Alzheimer's treatments
Date:2/9/2010

Scientists have determined that a new instrument known as PIB-PET is effective in detecting deposits of amyloid-beta protein plaques in the brains of living people, and that these deposits are predictive of who will develop Alzheimer's disease.

The finding, the result of a survey of more than 100 studies involving the instrument, including those by the scientists, confirms the sensitivity of the tool, not yet commercially available. In clinical practice, amyloid deposits are detected only on autopsy.

The study also provides strong evidence supporting the so-called "amyloid hypothesis" the theory that accumulation of amyloid-beta protein plaques in the brain is central to the development of the disease. While significant evidence has supported this hypothesis, it has been questioned for two main reasons. First, amyloid deposits do not correlate with the severity of the disease, and are, in fact, found at autopsy in people who did not have clinical symptoms; and second, drugs targeting the plaques have shown disappointing results, even when the drugs were successful at substantially lowering plaque burden. Thus, the question of amyloid's role in the illness has remained.

"Our survey of PIB-PET studies, which looked cross-sectionally and longitudinally at people with normal cognitive performance, mild cognitive impairment and full-fledged Alzheimer's disease, showed that amyloid deposits can be detected in a significant proportion of cognitively normal older adults, and that their presence is associated with Alzheimer's-like brain atrophy and changes in brain activity," says co-author Gil Rabinovici, MD, assistant professor of neurology in the UCSF Memory and Aging Center.

The study also showed that older individuals with amyloid deposits were much more likely to show cognitive decline over time than their "amyloid-negative" counterparts, says Rabinovici, whose co-author was William Jagust, MD, of the Helen Wills Neuroscie
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Contact: Jennifer O'Brien
jobrien@pubaff.ucsf.edu
415-476-2557
University of California - San Francisco
Source:Eurekalert

Page: 1 2 3

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