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Stimulating the brain's immune response may provide treatment for Alzheimer's disease
Date:1/26/2011

A new target for the prevention of adverse immune responses identified as factors in the development of Alzheimer's disease (AD) has been discovered by researchers at the University of South Florida's Department of Psychiatry and the Center of Excellence for Aging and Brain Repair.

Their findings are published online in the Journal of Neuroscience (http://www.jneurosci.org/).

The CD45 molecule is a receptor on the surface of the brain's microglia cells, cells that support the brain's neurons and also participate in brain immune responses.

Previous studies by the USF researchers showed that triggering CD45 was beneficial because it blocked a very early step in the development of Alzheimer's disease. In the present study, the researchers demonstrated in Alzheimer's mouse models that a loss of CD45 led to dramatically increased microglial inflammation.

Although the brain's immune response is involved in Alzheimer's disease pathology, "this finding suggests that CD45 on brain immune cells appears critically involved in dampening harmful inflammation," said study senior author Jun Tan, MD, PhD, a professor of psychiatry and Robert A. Silver chair at the Rashid Laboratory for Developmental Neurobiology, USF Silver Child Development Center and research biologist for Research and Development Service at the James A. Haley Veteran's Hospital.

The investigators also found an increase in harmful neurotoxins, such as A beta peptides, as well as neuron loss in the brains of the test mice.

"In short, CD45 deficiency leads to increased accumulation of neurotoxic A beta in the brains of old Alzheimer's mice, demonstrating the involvement of CD45 in clearing those toxins and protecting neurons," Dr. Tan said. "These findings are quite significant, because many in the field have long considered CD45 to be an indicator of harmful inflammation. So, researchers assumed that CD45
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Contact: Randolph Fillmore
rfillmor@health.usf.edu
813-850-7614
University of South Florida (USF Health)
Source:Eurekalert

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