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New findings on the brain's immune cells during Alzheimer's disease progression

Date:
April 11, 2013
Source:
Helmholtz Association of German Research Centres
Summary:
The plaque deposits in the brain of Alzheimer's patients are surrounded by the brain's own immune cells, the microglia. But it still remains unclear what role microglia play in Alzheimer's disease. Do they help break down the plaque deposit?

Immune cells of the brain, the microglia (brown), cluster around the beta-amyloid deposits (red) in a mouse model for Alzheimer’s disease.
Credit: Frank Heppner/ Copyright: Charité

The plaque deposits in the brain of Alzheimer's patients are surrounded by the brain's own immune cells, the microglia. This was already recognized by Alois Alzheimer more than one hundred years ago. But until today it still remains unclear what role microglia play in Alzheimer's disease. Do they help to break down the plaque deposit? A study by researchers of the Max Delbrück Center for Molecular Medicine (MDC) Berlin-Buch and Charité -- Universitätsmedizin Berlin has now shed light on these mysterious microglia during the progression of Alzheimer's disease.

Dr. Grietje Krabbe of the laboratory of Professor Helmut Kettenmann (MDC) and Dr. Annett Halle of the Neuropathology Department of the Charité headed by Professor Frank Heppner demonstrated that the microglial cells around the deposits do not show the classical activation pattern in mouse models of Alzheimer's disease. On the contrary, in the course of the Alzheimer's disease they lose two of their biological functions. Both their ability to remove cell fragments or harmful structures and their directed process motility towards acute lesions are impaired. The impact of the latter loss-of-function needs further investigation. The plaques consist of protein fragments, the beta-amyloid peptides, which in Alzheimer's disease are deposited in the brain over the course of years. They are believed to be involved in destroying the nerve cells of the affected patients, resulting in an incurable cognitive decline.

However, just why the microglial cells, which cluster around the deposits, are inactivated or lose their functionality is still not fully understood. The researchers concluded that this process occurs at a very early stage of disease development and is likely triggered by the beta-amyloid. This is confirmed by the fact that the loss-of-function of the microglial cells in the mice could be reversed by beta-amyloid antibodies thereby decreasing the beta-amyloid burden. According to the researchers, the potential to restore microglial function by directed manipulation should be pursued and exploited to develop treatments for Alzheimer's disease.


Story Source:

The above story is based on materials provided by Helmholtz Association of German Research Centres. Note: Materials may be edited for content and length.


Journal Reference:

  1. Grietje Krabbe, Annett Halle, Vitali Matyash, Jan L. Rinnenthal, Gina D. Eom, Ulrike Bernhardt, Kelly R. Miller, Stefan Prokop, Helmut Kettenmann, Frank L. Heppner. Functional Impairment of Microglia Coincides with Beta-Amyloid Deposition in Mice with Alzheimer-Like Pathology. PLoS ONE, 2013; 8 (4): e60921 DOI: 10.1371/journal.pone.0060921

Cite This Page:

Helmholtz Association of German Research Centres. "New findings on the brain's immune cells during Alzheimer's disease progression." ScienceDaily. ScienceDaily, 11 April 2013. <www.sciencedaily.com/releases/2013/04/130411124008.htm>.
Helmholtz Association of German Research Centres. (2013, April 11). New findings on the brain's immune cells during Alzheimer's disease progression. ScienceDaily. Retrieved July 28, 2014 from www.sciencedaily.com/releases/2013/04/130411124008.htm
Helmholtz Association of German Research Centres. "New findings on the brain's immune cells during Alzheimer's disease progression." ScienceDaily. www.sciencedaily.com/releases/2013/04/130411124008.htm (accessed July 28, 2014).

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