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'Biomarkers' May Help Spot, Track Alzheimer's
Date:7/29/2008

A number of molecules in blood and spinal fluid seem likely candidates, researchers say

TUESDAY, July 29 (HealthDay News) -- Scientists may be succeeding in the hunt for biomarkers for Alzheimer's disease.

A biomarker -- something that can be measured and that gives an indication of what's going on inside the body -- will help in early detection, in testing new therapies and, once doctors have better drugs for Alzheimer's, with earlier intervention in the disease process.

"If we're going to have any kind of medication that alters or modifies the disease, if it's really going to change it rather than treat symptoms, then we need biomarkers that are sensitive to the illness before a person becomes impaired," explained Dr. Gary Kennedy, director of geriatric psychiatry at Montefiore Medical Center in New York City. "In Alzheimer's, we need two things: We need to know who's sick and who's not and, secondly, biomarkers should be treatment-sensitive, meaning if you've got the right treatment, you watch the biomarker go down, like blood sugar and insulin. That's the model we want."

One study being presented at the International Conference on Alzheimer's Disease (ICAD) in Chicago found that differences in levels of CD-69, a protein involved in white blood cell growth and production, allowed researchers to distinguish between people with Alzheimer's, people with Parkinson's-related dementia and those who were cognitively normal.

The study, from researchers at the University of Leipzig in Germany, was based on a theory that Alzheimer's occurs when neurons get a false signal to divide. The more popular theory holds that a build-up of amyloid plaque (made up mostly of beta amyloid protein) in the brain causes Alzheimer's.

"The alternative theory about Alzheimer's is that the [cell] replication process gets triggered pathologically, and then the cells are programmed to die, and that's what's killing the
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