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Researchers link new molecular culprit to breast cancer progression
Date:11/26/2012

genes on, they have to be available, but many of the genes HIF-1 activates are normally locked down in mature cells," explains Luo. "So we thought HIF-1 must have a partner that can do the unlocking."

That partner turned out to be JMJD2C, Luo says. Delving deeper, the researchers found that HIF-1 switches on the JMJD2C gene, stimulating production of the protein. HIF-1's presence also enables JMJD2C to bind to DNA at other HIF-1 target genes, then loosen those DNA sections, enabling more HIF-1 to bind to the same sites and activate the target genes.

To test the implications of their discovery, the research team injected mice with breast cancer cells in which the JMJD2C protein was not produced. Tumors with depleted JMJD2C were much less likely to grow and metastasize to the lungs, confirming the protein's role in breast cancer progression, says Luo.

"Active HIF proteins have been found in many types of tumors, so the implications of this finding go beyond breast cancer," says Luo. "JMJD2C is both an important piece of the puzzle of how tumors metastasize, and a potential target for anti-cancer therapy."


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Contact: Shawna Williams
shawna@jhmi.edu
410-955-8236
Johns Hopkins Medicine
Source:Eurekalert

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