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Elevated Cholesterol Plays Significant Role in Alzheimer's Development

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www.ProHealth.com • July 5, 2002


New research at Georgetown University Medical Center has led to a deeper understanding of the role that elevated cholesterol plays in the development of Alzheimer's disease.

In data presented at the June 2002 annual meeting of The Endocrine Society, researchers discussed APP, a protein found in several major organs including the brain and heart that is present in all people. Its normal function in the body is unknown, but in people with Alzheimer's, APP is abnormally processed and converted to beta amyloid protein. When fragments of this protein break off, they become entangled, leading to the plaques that are one of the characteristic abnormalities found in the brains of people suffering from Alzheimer's.

"Past research has shown that high cholesterol levels appear to increase APP levels, which in turn leads to increased levels of beta amyloid protein and the risk of accumulation of amyloid beta peptide," said Vassilios Papadopoulos, Ph.D., professor of cell biology and pharmacology. "Our research showed that high cholesterol levels also increase the rate at which the amyloid beta peptides break off and form the tangles that kill brain cells."

In addition to this discovery, the Georgetown research also found that high cholesterol increases the production of another protein, apolipoprotein E (APOE), which is mainly responsible for transportation of cholesterol out of the cell. Researchers discovered that too much APOE results in the accumulation of free cholesterol, which is toxic to human nerve cells.

Papadopoulos and colleagues found that introducing a certain type of protein, bovine lipoproteins, would bind with the free cholesterol, allowing it to be transported back to the liver and negating its harmful effects.

"By giving the dangerous free cholesterol something to bind to, we are paving the way for possible new therapies," Papadopoulos said. "Our study adds to the growing body of evidence implicating high cholesterol as a significant risk factor in Alzheimer's disease, and breaks new ground in showing the damage caused by excessive levels of cholesterol." Papadopoulos added that many years of further study are required before any therapy derived from his team's findings might be tested in humans.



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