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Targeting the blood-brain barrier may delay progression of Alzheimer's disease
Date:4/12/2010

Researchers may be one step closer to slowing the onset and progression of Alzheimer's disease. An animal study supported by the National Institute of Environmental Health Sciences (NIEHS), part of the National Institutes of Health, shows that by targeting the blood-brain barrier, researchers are able to slow the accumulation of a protein associated with the progression of the illness. The blood-brain barrier separates the brain from circulating blood, and it protects the brain by removing toxic metabolites and proteins formed in the brain and preventing entry of toxic chemicals from the blood.

"This study may provide the experimental basis for new strategies that can be used to treat Alzheimer's patients," said David S. Miller, Ph.D., chief of the Laboratory of Toxicology and Pharmacology at NIEHS and an author on the paper that appears in the May issue of Molecular Pharmacology.

Alzheimer's is an irreversible, progressive brain disease that slowly destroys memory and thinking skills, and eventually disrupts function of major organs. Estimates vary, but experts suggest that as many as 2.6 million to 5.1 million Americans may have Alzheimer's. One hallmark of Alzheimer's is the deposition of beta-amyloid protein in the brain. This protein clumps to form plaques that destroy neurons and lead to cognitive impairment and memory loss in Alzheimer patients.

"What we've shown in our mouse models is that we can reduce the accumulation of beta-amyloid protein in the brain by targeting a certain receptor in the brain known as the pregnane X receptor, or PXR," said Miller.

The researchers from NIEHS and the University of Minnesota Duluth demonstrated that when 12-week-old genetically modified mice expressing human beta-amyloid protein are treated with a steroid-like chemical that activates PXR, the amount of beta-amyloid protein in the brain is reduced. The activation of the PXR was found to increase the expression of a blo
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Contact: Robin Mackar
rmackar@niehs.nih.gov
919-541-0073
NIH/National Institute of Environmental Health Sciences
Source:Eurekalert

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