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Researchers find way to decrease chemoresistance in ovarian cancer
Date:5/2/2014

ATLANTA--Inhibiting enzymes that cause changes in gene expression could decrease chemotherapy resistance in ovarian cancer patients, researchers at Georgia State University and the University of Georgia say.

Dr. Susanna Greer, associate professor of biology, and research partners at the University of Georgia have identified two enzymes that suppress proteins that are important for regulating cell survival and chemoresistance in ovarian cancer. Their findings are published in the journal, PLOS ONE.

Ovarian cancer is one of the deadliest gynecological cancers, with a 60 percent mortality rate and a five-year survival rate for less than 30 percent of women in the advanced stage of the disease. The high mortality rate is largely due to the development of resistance to chemotherapeutic drugs. Understanding the molecular and genetic mechanisms that drive the development of acquired chemoresistance can help improve therapeutic agents for ovarian cancer treatment.

"Ovarian cancer is usually treated by surgery followed by chemotherapy," Greer said, "but because it's typically found fairly late, ovarian cancer is often refractory to chemotherapy. You have tumors that initially respond to chemotherapy and then don't. Ovarian cancer is the 8th most commonly diagnosed cancer in U.S. women, but due to its late diagnosis, causes more deaths than any other cancer of the female reproductive system."

In a previous study, Greer found the expression of the protein RGS10, which regulates ovarian cancer cell growth and survival, is suppressed in ovarian cancer cells that are chemoresistant. The suppression was caused by two important mechanisms that silence genes and contribute to the progression of many cancers - DNA methylation, a biochemical process in which a methyl group is added to specific building blocks of DNA, and histone deacetylation, a process in which enzymes remove functional groups of atoms from proteins associated with DNA.
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Contact: LaTina Emerson
lemerson1@gsu.edu
404-413-1353
Georgia State University
Source:Eurekalert

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