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Researchers link Huntington's disease to overactive immune response in the brain
Date:7/14/2008

The damage to brain tissue seen in Huntington's disease may be caused by an overactive immune response in the bloodstream and the brain, according to new findings from two teams of researchers at the University of Washington in Seattle and University College London. The findings will be published online July 14 in the Journal of Experimental Medicine.

Working separately, the two teams found evidence in both brain cells and the bloodstream suggesting an important link between the immune system's response and Huntington's disease. Together, the findings may help scientists find biological markers for monitoring the disease progression earlier and with more accuracy, and could help them develop new treatments for the disease. Huntington's is a fatal inherited neurodegenerative disorder for which there is currently no effective treatment.

The UW team, lead by Dr. Thomas Moeller, research associate professor of neurology, had previously studied the role of inflammation and immune response in neurodegenerative diseases like Huntington's and ALS, also known as Lou Gehrig's disease. In this study, they found that patients with Huntington's had higher levels of immune-system signaling molecules, called cytokines, in their brain tissue.

The UW researchers then looked at a mouse-based model of the disease, studying the response of microglia, the immune cells of the nervous system. When the microglia were treated with a molecule triggering an immune response, the microglia from Huntington's mice produced much higher levels of cytokines, the immune system molecules. That finding suggests that the protein produced by the Huntington's disease genetic mutation, a protein called huntingtin, is causing the immune cells to be overactive. The researchers think that overly strong immune response may be the mechanism through which the disease causes damage to neurons in the brain.

"When we found increased levels of cytokines in the brains
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Contact: Justin Reedy
jreedy@u.washington.edu
206-685-0382
University of Washington
Source:Eurekalert

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