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Drug Strategy Makes Cancer Genes Get Lost in Translation

A new strategy for fighting cancer aims to make its genes get lost in translation, according to a report published by Cell Press.//

According to the researchers, such a therapy would essentially take advantage of a weakness of the disease: that the majority of growth- and proliferation-related proteins, which cancer depends upon, are encoded by "weak" messenger RNAs (mRNAs). Transcribed from DNA, mRNAs serve as templates for the synthesis of proteins through a process known as translation.

The researchers now report the discovery of a small molecule that targets such weak mRNA, preferentially interrupting its translation into active proteins. As a result, the molecule, called 4EGI-1, effectively silences oncogenes, which have links to cancer. They also found evidence that the small molecule inhibitor exhibits activity against multiple cancer cell lines, including lung and blood cancer cells.

While cancer-promoting proteins may be lost as a result of such treatment, more readily translated "housekeeping" genes--those encoded by "strong" mRNAs that cells need on a regular basis--might continue their activities, said Gerhard Wagner of Harvard Medical School. Therapies targeted at translation might have general use in tackling many forms of cancer, regardless of its genetic origin, given that the uncontrolled growth of cells is a general characteristic of the disease, he added.

The new findings establish a "possible new strategy for cancer therapy," the researchers said. However, they cautioned, the newly described inhibitor is not strong enough for use as a drug in itself. The researchers will next work to chemically modify the inhibitor to enhance its action and screen additional chemical libraries in search of more potent molecules before tests of such a drug in animals could ensue.

Weak mRNAs are translated into proteins less efficiently as a result of long and highly structured, "untranslated regions" at
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