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Insulin receptor stops progression of Alzheimer's disease

Providence, RI Stimulation of a receptor in the brain that controls insulin responses has been shown to halt or diminish the neurodegeneration of Alzheimer's disease, providing evidence that the disease can be treated in its early stages, according to a study by researchers at Rhode Island Hospital and Brown Medical School.

Researchers have found that peroxisome-proliferator activated receptor (PPAR) agonists prevent several components of neurodegeneration and preserve learning and memory in rats with induced Alzheimer's disease (AD). They found that an agonist for PPAR delta, a receptor that is abundant in the brain, had the most overall benefit.

"This raises the possibility that you can treat patients with mild cognitive impairment who have possible or probable Alzheimer's disease. This is really amazing because right now, there's just no treatment that works," says lead author Suzanne M. de la Monte, MD, MPH, a neuropathologist at Rhode Island Hospital and a professor of pathology and clinical neuroscience at Brown Medical School in Providence, RI.

The study appears in the September issue (Volume 10, Issue 1) of the Journal of Alzheimer's Disease (www.j-alz.com).

In previous studies, the researchers demonstrated that Alzheimer's is a brain-specific neuroendocrine disorder, or a Type 3 diabetes, distinct from other types of diabetes. They showed that insulin and IGF-I receptors are produced separately in the brain, and begin to disappear early in Alzheimer's and continue to decline as the disease progresses. As insulin signaling breaks down, it leads to increased oxidative stress, impaired metabolism and cell death all causing neurodegeneration.

Scientists were also previously able to replicate Alzheimer's in rats with Streptozotocin (STZ), a compound that is known to destroy insulin producing cells in the pancreas and cause diabetes. When injected into the brains of rats, the c
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Contact: Nicole Gustin
ngustin@lifespan.org
401-444-7299
Lifespan
21-Sep-2006


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