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Researchers Examine Alzheimer’s Treatment

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By News release • • May 31, 2000

A cell receptor called RAGE may be a new potential target for compounds to treat or prevent Alzheimer's Disease.

Researchers at the University of Kentucky College of Medicine and the Columbia University College of Physicians and Surgeons have determined that a receptor -- called the receptor for advanced glycation endproducts (or RAGE) -- interacts with amyloid fibrils (small fibers containing starch). RAGE is a multiligand receptor, meaning that it interacts with many molecules. When RAGE interacts with the amyloid fibrils, it accelerates fibril formation and induces cellular dysfunction.

UK researchers disrupted the interaction of RAGE with amyloid fibrils two ways. They added additional amounts of soluble RAGE to neurons with amyloid fibrils. Because the RAGE molecules were not linked to cells, they could interact with the fibrils but not cause cellular dysfunction. They also added an antibody to RAGE that would bind to the receptor and prevent any interaction with amyloid fibrils.

Both methods suppressed amyloid formation in a systemic model of amyloid diseases, including Alzheimer's disease. By blocking RAGE with an antibody, the researchers found that the process of amyloid fibril deposition was reversed.

"The exciting thing about this research is that it suggests that RAGE may be a potential target for inhibiting amyloid fibril deposition, which would likely inhibit the progression of Alzheimer's disease," said one of the study’s authors, Mark Kindy.

About 4 million people nationwide have Alzheimer’s. A protein called amyloid-beta is thought to be critical in the disease’s development, although the exact role of amyloid-beta is unknown. Collections of amyloid-beta proteins, also called amyloid fibrils, are found in the brains of Alzheimer's patients and cause tissue damage and eventually death.

The study leaders were Shi Du Yan, M.D., assistant professor of pathology, and David Stern, M.D., professor of physiology and cellular biophysics and of surgery, both at the Columbia University College of Physicians and Surgeons, and Mark Kindy, Ph.D., associate professor of biochemistry at the UK College of Medicine, UK Sanders-Brown Center on Aging, Stroke Program at the UK Chandler Medical Center, and Veterans Affairs Medical Center in Lexington. The results of the research are published in the June issue of Nature Medicine.

Source: Eurekalert

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