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Substance tackles skin cancer from 2 sides
Date:11/2/2008

By playing it safe and using a two-pronged attack, a novel designer molecule fights malignant melanoma. It was created and tested by an international team of researchers led by the University of Bonn. On the one hand, the substance is similar to components of viruses and in this way alerts the immune system. The body's own defences are also strengthened against cancer cells in this process. At the same time, the novel molecule also puts pressure on the tumour in a different way. It switches off a specific gene in the malignant cells, thus driving them to suicide. With mice suffering from cancer, the researchers have thus been able to fight metastases in the lung. In Nature Medicine's November issue they report about this promising strategy. This article is available online from November 2nd 6 p.m. GMT onwards (doi: 10.1038/nm.1887).

For their research project, the scientists drew on the latest insights into biology's box of tricks. A close relative of the nuclear DNA, known as RNA, served them as therapy. It has only been known for a few years that small RNA molecules can basically be used to target certain genes and switch them off. This effect is called RNA interference; the Americans Craig Mellow and Andrew Fire were awarded the Nobel Prize in 2006 for its discovery.

'We used this method in order to drive the tumour cells to suicide,' the Bonn dermatology researcher Professor Thomas Tting explains. Every single body cell is equipped with a corresponding suicide programme. It is activated, for example, if the cell becomes malignant. It dies before it can do any more harm. 'But in tumours a gene is active that suppresses this suicide programme,' Professor Tting, who is head of the Experimental Dermatology Laboratory, explains. 'We have pinpointed this gene and switched it off by using RNA interference.'

At the same time the researchers also crept up on cancer by another route: 'We basically "disguised" our RNA,' Professor Gunt
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Contact: Professor Thomas Tting
Thomas.Tueting@ukb.uni-bonn.de
49-022-828-719-257
University of Bonn
Source:Eurekalert

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