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Scientists discover how neuroglobin protects against Alzheimer's
Date:8/2/2010

A team of scientists at the University of California, Davis and the University of Auckland has discovered that neuroglobin may protect against Alzheimer's disease by preventing brain neurons from dying in response to natural stress. The team published the results of their study in the April, 2010 issue of Apoptosis.

Scientists have learned that neuroglobin protects cells from stroke damage, amyloid toxicity and injury due to lack of oxygen. Neuroglobin occurs in various regions of the brain and at particularly high levels in brain cells called neurons. Scientists have associated low levels of neuroglobin in brain neurons with increased risk of Alzheimer's disease. Recent studies have hinted that neuroglobin protects cells by maintaining the function of mitochondria and regulating the concentration of important chemicals in the cell. However, the exact mechanisms by which neuroglobin protects cells from dying a natural death has, until now, remained unclear.

The lead author of the study, UC Davis biomedical engineering professor Subhadip Raychaudhuri, found that neuroglobin preserves the functioning of a cell's mitochondria by neutralizing a molecule necessary for the formation of a type of protein that triggers the cell's collapse. The scientists think that the fundamental role of neuroglobin found in neurons is to prevent accidental cell death from occurring due to stress associated with normal cell functioning. Cells may protect themselves from triggering the chain of events leading to cell death by expressing a high level of neuroglobin.

Mitochondria are tiny "capsules" within a cell that make most of the raw material the cell uses to produce its energy. Mitochondria also play important roles in communication within and between cells and important aspects of cell differentiation and growth. A cell dies quickly when its mitochondria stop functioning. Various kinds of stressors, such as lack of oxygen, low nutrient levels, in
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Contact: Holly Ober
hjober@ucdavis.edu
University of California - Davis - Health System
Source:Eurekalert

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