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Untangling Alzheimer's disease
Date:10/28/2013

ting material, a house, and frequently changing toys. Such environments have been shown to improve and maintain brain function in animals much as intellectual activity and physical fitness do in people.

The researchers ran a series of tests on a part of the mice's brains called the hippocampus, which plays a major role in memory and spatial navigation and is one of the earliest targets of Alzheimer's disease in humans. They found that, compared to mice in normal cages, the mice from the enriched environment developed higher levels of good proteins and lower levels of bad proteins. Then, for the first time, they identified the microRNAs responsible for regulating the expression of both good and bad proteins.

Armed with this new information, the researchers analyzed changes in the levels of microRNAs in the hippocampi of young, middle-aged, and old mice with an Alzheimer's-disease-like condition. They found that some of the microRNAs were expressed in exactly inverse amounts in mice with Alzheimer's disease as they were in mice from the enriched environment. The results were higher levels of bad proteins and lower levels of good proteins in the hippocampi of old mice with Alzheimer's disease. The microRNAs the researchers identified had already been shown or predicted to regulate the expression of proteins in ways that contributed to Alzheimer's disease. Their finding that the microRNAs are inversely regulated in mice from the enriched environment is important, because it suggests the molecules can be targeted by activities or drugs to preserve brain function.

Brain-busting potential

Two findings appear to have particular potential for treating people with Alzheimer's disease. In the brains of old mice with the disease, microRNA-325 was diminished, leading to higher levels of tomosyn, a protein that is well known to inhibit cellular communication in the brain. The researchers hope that eventually microRNA-325 can be used to
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Contact: George Hunka
ghunka@aftau.org
212-742-9070
American Friends of Tel Aviv University
Source:Eurekalert

Page: 1 2 3

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