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New model could lead to improved treatment for early stage Alzheimer's
Date:2/28/2013

GAINESVILLE, Fla. Researchers at the University of Florida and The Johns Hopkins University have developed a line of genetically altered mice that model the earliest stages of Alzheimer's disease. This model may help scientists identify new therapies to provide relief to patients who are beginning to experience symptoms.

The researchers report their findings in the current issue of The Journal of Neuroscience.

"The development of this model could help scientists identify new ways to enhance brain function in patients in the early stages of the disease," said David Borchelt, UF professor of neuroscience in the Evelyn F. and William L. McKnight Brain Institute and director of the SantaFe HealthCare Alzheimer's Disease Research Center. "Such therapies could preserve brain function longer and delay the appearance of more severe symptoms that leave patients unable to care for themselves."

In the early stages of Alzheimer's disease, people struggle with and fail to learn new games, rules or technologies because their cognitive flexibility decreases. The degenerative disease continues with memory loss and the decline of other brain functions.

The researchers worked with mice that had specially designed gene fragments derived from bacteria and from humans that allowed the investigators to control the production of a small peptide. The peptide, called amyloid beta peptide, is a short chain of amino acids. Accumulations of this particular peptide in the brain as lesions called plaques occur early in the progression of Alzheimer's disease and seem to trigger the early memory problems.

The team regulated the expression of the peptide using antibiotics when the animals stopped taking the antibiotic, the peptide-producing gene turned on and caused the mice to develop the plaques found in Alzheimer's patients. After the mice had developed the Alzheimer pathology, the researchers turned the gene back off and observed that
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Contact: Melissa Lutz Blouin
melissa.blouin@ufl.edu
352-273-5810
University of Florida
Source:Eurekalert

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