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Dioxin-like chemical messenger makes brain tumors more aggressive
Date:10/6/2011

of cancer such as cancers of the bladder, bowel or lungs.

It was even more astonishing for the investigators to find that kynurenin activates a protein known as dioxin receptor. This, in turn, triggers a cascade of chemical reactions which ultimately promote tumor growth and weaken the immune system. So far, it had only been known that the dioxin receptor, scientifically called aryl hydrocarbon receptor (AHR), is activated by environmental toxins. "Why this receptor is even present in body cells and which is its activation partner in the body, was yet unknown," says Dr. Christiane Opitz, first author of the research article. "Kynurenin seems to have very similar effects as dioxin, but it is formed by the body itself," said Professor Platten.

Yet another new discovery was presented by the group: The amino acid tryptophan was broken down in cancer cells by a specific enzyme called tryptophan dioxygenase, or TDO for short, which scientists had previously found primarily in liver cells. "It came as a surprise to us that TDO is also active in cancer cells and strongly so in particularly aggressive tumors."

Searching for substances to specifically inhibit this metabolic pathway

The newly discovered metabolic pathway is a potential target for cancer treatment. The intention is to inhibit tumor growth and strengthen the immune system. "We will start searching for substances that specifically inhibit this metabolic pathway and may be used as potential antitumor drugs," said Professor Wolfgang Wick envisioning the next steps ahead.


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Contact: Dr. Michael Platten
michael.platten@med.uni-heidelberg.de
49-062-215-66804
University Hospital Heidelberg
Source:Eurekalert

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