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“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 the mice showed persistent memory problems that resemble the early stages of the disease.
“This model may be useful to researchers to test drugs that could help with symptoms of early stage Alzheimer’s disease,” Borchelt said.This research is funded by the National Institute of Neurological Disease and Stroke of the National Institutes of Health, and the SantaFe HealthCare Alzheimer’s Disease Research Center of the University of Florida.
About the Author
Melissa Blouin is the Director of News and Publications at the University of Florida Academic Health Center. She was previously the senior director of academic communications at the University of Arkansas.