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Dangerous custodians
Date:3/22/2010

Microglia are the cells responsible for immune surveillance in the brain, and they initiate protective inflammatory reactions in response to tissue damage and infection. An international team under the leadership of LMU neuroscientist Professor Jochen Herms has now shown that these cells may actually make a significant contribution to the loss of neurons associated with Alzheimer's disease. About 1.2 million people are thought to suffer from this form of progressive dementia in Germany, and this figure is expected to double as the average age of the population continues to increase. Their new findings lead Professor Herms and his team to believe that, as the disease develops, stressed nerve cells secrete a chemical messenger that attracts microglia. The ensuing inflammatory reactions ultimately result in the elimination of the neurons. This implies that chemical signalling between nerve cells and microglia plays an important role in mediating neuron loss during the course of the disease. "We may be able to make use of these results to develop novel agents that can slow the rate of neuron loss by interrupting communications between the two cell types", says Herms. (Nature Neuroscience online, 21 March 2010)

It is estimated that as many as 18 million people currently suffer from Alzheimer's disease worldwide, and the numbers are rising. This form of progressive dementia is due to an inexorable loss of nerve cells from the brain that is associated with the formation of insoluble protein aggregates, called beta-amyloid plaques and tangles. Large numbers of microglia gather in the vicinity of these plaques. Microglia serve as immune "policemen" that use their long processes to monitor their surroundings for signs of tissue damage. In accordance with this role, it has been thought that they congregate near plaques in order to degrade them.

Using two-photon microscopy, Professor Herms and his colleagues at the LMU's Center for Neuropathology wer
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Contact: Dr. Jochen Herms
Jochen.Herms@med.uni-muenchen.de
49-892-180-78010
Ludwig-Maximilians-Universitt Mnchen
Source:Eurekalert

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