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Lipid peroxides -- more sophisticated than their reputation
Date:8/24/2010

This release is available in German.

In a joint study conducted by Helmholtz Zentrum Mnchen, the German Center for Neurodegenerative Diseases (DZNE) and a research group at Karolinska Institutet in Stockholm, Sweden, researchers have now discovered that lipid peroxides* play a specific physiological role in the cell. Prior to this study, scientists had already established that accumulation of lipid peroxides* indicate cell stress. Lipid peroxides have further been shown to be very potent inducers of cell death. The results of this study now demonstrate that chemically modified (oxidized) lipids temporarily inactivate protein tyrosine phosphatases*. These in turn regulate the cellular communication of receptor tyrosine kinases (RTK)*. This finding is of central importance because aberrant activation of the receptor tyrosine kinases contributes to many diseases, including cancer. Until now, only hydrogen peroxide was known to oxidize and inactivate protein tyrosine phosphatases and thus to have a regulating effect on kinases.

"We were able to show that lipid peroxides are 100-1000 times more effective than hydrogen peroxide," said Dr. Marcus Conrad, lead authors of the publication, who has since moved from Helmholtz Zentrum Mnchen to the German Center for Neurodegenerative Disease. Dr. Arne stman and sa Sandin from the Karolinska Institutet added: "It will be very interesting to see if lipid peroxides contribute to the activation of tyrosine kinases in cancer and other diseases, e.g. diabetes and Alzheimer's disease."

*Background

Lipid peroxides are chemically modified lipids or fatty acids, which, among other things, indicate cellular stress. In high concentrations they can trigger cell death. Elevated concentrations of lipid peroxides are often found in patients with common diseases such as atherosclerosis, diabetes, cancer
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Contact: Sven Winkler
presse@helmholtz-muenchen.de
49-089-318-73946
Helmholtz Zentrum Mnchen - German Research Center for Environmental Health
Source:Eurekalert

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