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JCI early table of contents for March 26, 2012
Date:3/20/2012

EDITOR'S PICK
New evidence links Alzheimer's disease and diabetes

An emerging body of research suggests that Alzheimer's disease may be linked to insulin resistance, constituting a third type of diabetes. This model is based on several observations including an increased risk of developing Alzheimer's disease for diabetic patients, and reduced insulin levels in the brain tissue of Alzheimer's disease patients. Though intriguing, the existing evidence does not reveal if defective insulin signaling is causative of Alzheimer's or how insulin resistance impacts cognitive function. Two back-to-back research articles in the Journal of Clinical Investigation led by Konrad Talbot, Steve Arnold and colleagues at the University of Pennsylvania and by Fernanda De Felice, Sergio Ferreiria and colleagues at the University of Rio de Janeiro - address the connection between insulin resistance and Alzheimer's disease. The University of Pennsylvania team examined insulin signaling in human brain tissue postmortem, and concluded that the activation state of many insulin signaling molecules were highly related to memory and cognitive function. They further suggest that insulin resistance is a common and early feature of Alzheimer's disease. The De Felice group also observed impaired insulin signaling in Alzheimer's brain tissue in rodent and non-human primate model systems as well as from tissue from human patients. They went on to show in a mouse model system of Alzheimer's disease that treatment with a new anti-diabetic drug normalized insulin signaling and remarkably improved cognitive function. Cumulatively, these two new studies strongly support a connection between insulin resistance and Alzheimer's disease and provide hope for new therapeutics in Alzheimer's disease treatment.

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An anti-diabetes agent protects the mouse brain from defective insulin signaling caused by Alzheimer's diseaseassociated Aβ oligomers

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Contact: Sarah Jackson
press_releases@the-jci.org
Journal of Clinical Investigation
Source:Eurekalert

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