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Insulin receptor stops progression of Alzheimer's disease

odegeneration of Alzheimer's disease ?plaque deposits, neurofibrillary tangles, diminished brain size, impaired cognitive function, cell loss and overall brain deterioration.

Having created an animal model for Alzheimer's, researchers in this study induced Alzheimer's with STZ and then administered treatment with three classes of PPAR agonists ?alpha, gamma and delta. All are found in various tissues and organs in the body, including the brain, and PPAR gamma is already FDA approved as a treatment for Type 2 diabetes, or adult-onset diabetes. The two other classes of PPAR agonists have not yet been approved for clinical use.

Following treatment, many of the abnormalities associated with Alzheimer's were reduced or nearly disappeared. The agonists affected different regions of the brain, with PPAR delta producing the most striking effect in preserving the hypothalamus and temporal lobes, areas of the brain responsible for memory, learning, and behavior. In these brain regions, PPAR alpha and PPAR gamma were effective in reducing amyloid gene expression. PPAR delta had the most benefit for reducing oxidative stress and improving learning and memory.

"That was the most spectacular," de la Monte says, "because everybody wants something for cognitive impairment, and that was the most improved with the PPAR delta agonist."

Researchers were not able to stop the deterioration of insulin and its receptors. However, by administering PPAR, they were able to bypass the defects in insulin signaling and preserve the cells that need insulin to thrive. PPAR molecules go directly to the nucleus of cells and tell DNA to turn on or off genes that are normally regulated by insulin, thus preventing them from dying and allowing them to communicate with each other. The major effects of the PPAR treatments were to increase brain size, preserve insulin and IGF-II receptor bearing neurons, and preserve learning and memory.

"The trigger for dementia is
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Source:Lifespan


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