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Scripps Florida scientists uncover a novel cooperative effort to stop cancer spread
Date:11/28/2012

JUPITER, FL, November 28, 2012 Scientists from the Florida campus of The Scripps Research Institute (TSRI) have uncovered a group of what have been considered relatively minor regulators in the body that band together to suppress the spread of cancer from its primary site.

The discovery offers a fresh batch of possible therapeutic targets as well as new diagnostic tools with the potential to predict and inhibit the spread of cancer (metastasis) in patients suffering from the disease.

The research, published recently in The Journal of Biological Chemistry, was conducted by TSRI Professor Donald G. Phinney, a nationally recognized authority in the study of adult bone marrow-derived stem cells, and a postdoctoral fellow in his laboratory, Christopher L. Haga.

In the new study, the scientists found that a cluster of seven microRNAs (miRNA) function cooperatively to repress a process known as epithelial-to-mesenchymal transition (EMT). While EMT is part of the normal biology of cell development in some parts of the body, the process has recently been implicated in two dangerous aspects of tumor growthtumor metastasis and the growth of drug-resistant cancer stem cells.

MicroRNAs are tiny fragments of RNA found in all mammalian cells. They bind to messenger RNAs, a process that generally results in gene silencing. This cluster of miRNAs, located in a genetic region known as DLK1-DIO3, suppresses a specific signaling network in human cancers that primarily affect glands such as breast cancer.

"These results establish the DLKI-DIO3 miRNA cluster as a critical checkpoint regulating tumor growth and metastasis," said Phinney. "Our data shows that when this cluster is silenced, it accelerates tumorogenesis and proliferation by inducing EMT."

Silencing the DLK1-DIO3 genetic region is an early event for tumors, Phinney said, pointing out that micro-metastasis can be detected even in the early stages of breast ca
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Contact: Eric Sauter
esauter@scripps.edu
267-337-3859
Scripps Research Institute
Source:Eurekalert  

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