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Researchers find new culprit in castration-resistant prostate cancer
Date:12/13/2012

it regulates the activity of genes without changing their DNA structure. Previously it was found that EZH2 levels are dramatically increased in late-stage castration resistant prostate cancer, Brown said, but researchers thought the protein was acting primarily to turn off gene activity which is its normal role.

Drugs aimed at blocking EZH2 activity are being tested in other cancers, where they are designed to block the protein's gene-suppressing role. However, they carry a risk of harmful side effects as a result. "But we found that isn't the important function of EZH2 in CRPC," Brown explained. "In these cancers, EZH2 works with the androgen receptor to turn on genes involved with cell growth." As a result, he proposes that inhibitors of EZH2 that avoid targeting its gene-repressor function might be a safe and effective strategy for use in castration-resistant prostate cancers.

Further, said Brown, the EZH2 protein itself is activated by a molecular signaling pathway known as PI3K, or PI3 kinase. Several PI3K inhibitors are in clinical trials at present, and Brown said that a combination of drugs to inhibit both that pathway and the EZH2 protein might be yet another way to attack the resistant prostate cancers.


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Contact: Bill Schaller
william_schaller@dfci.harvard.edu
617-632-5357
Dana-Farber Cancer Institute
Source:Eurekalert  

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