Study Examines How Stress Effects Alzheimer's
Stress hormones appear to rapidly exacerbate the formation of brain lesions that are the hallmarks of Alzheimer's disease, according to researchers at UC Irvine. The findings suggest that managing stress and reducing certain medications prescribed for the elderly could slow down the progression of this devastating disease. In a study with genetically modified mice, Frank LaFerla, professor of neurobiology and behavior, and a team of UCI researchers found that when young animals were injected for just seven days with dexamethasone, a glucocorticoid similar to the body's stress hormones, the levels of the protein beta-amyloid in the brain increased by 60 percent. When beta-amyloid production increases and these protein fragments aggregate, they form plaques, one of the two hallmark brain lesions of Alzheimer's disease. The scientists also found that the levels of another protein, tau, also increased. Tau accumulation eventually leads to the formation of tangles, the other sig...