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RNA promotes metastasis in lung cancer
Date:2/5/2013

The vast majority approximately 80 percent of our DNA does not code for proteins, yet it gets transcribed into RNA. These RNA molecules are called non-coding and fulfill multiple tasks in the cell. Alongside a well-studied group of small RNAs, there is also a class of so-called long non-coding RNAs consisting of more than 200 nucleotides.

Long non-coding RNAs regulate cellular processes such as cell cycle, growth and cell death. Therefore, it came as no surprise that many of these controlling molecules are linked to the progression of cancer. An example is the non-coding RNA MALAT1, which is considered a marker for disease progression in various forms of lung cancer: "The more MALAT1 tumor cells produce, the higher the odds for metastasis and a very unfavorable course of the disease," says Dr. Sven Diederichs, who discovered the molecule as part of his doctoral thesis. Diederichs now leads a junior research group at the German Cancer Research Center (Deutsches Krebsforschungszentrum, DKFZ) and the Institute of Pathology of Heidelberg University.

In his current project, Diederichs has investigated the actual mechanisms used by MALAT1 to interfere in cellular processes and to promote metastasis. Diederichs and his team recently developed a method for selectively silencing long non-coding RNAs in the cell. To do so, the researchers integrate signaling sequences into the DNA which cause RNA transcripts to be broken down immediately after being formed. Then they analyze resulting changes in cellular biology.

For the first time, Diederichs and his team have been able to achieve almost complete silencing of MALAT1 in lung cancer cell cultures. In the modified cells they found that MALAT1 regulates numerous genes involved in metastasis. As a result, MALAT1-deficient tumor cells have impaired mobility and are less capable of invading surrounding tissue. When implanted in mice, they formed considerably less tumor nodules in the animals' lu
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Contact: Sibylle Kohlstdt
s.kohlstaedt@dkfz.de
Helmholtz Association of German Research Centres
Source:Eurekalert

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