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Cancer cell line developed that is resistant to new cancer therapy
Date:12/11/2007

A cancer cell line that is resistant to one of the newest classes of cancer treatments has been developed by researchers who already are using it to determine what else to give patients when this happens.

The ultimate goal is to be able to understand how cancer cells develop resistance and to have forward-thinking strategies about how to combat that resistance, says Dr. Warren Fiskus, postdoctoral fellow in the laboratory of Dr. Kapil Bhalla, director of the Medical College of Georgia Cancer Center.

Resistant cells emerged by treating human leukemic cells with regular, increasing doses of histone deacetylase, or HDAC, inhibitors, similar to what patients would receive. At each dose level, there were some cells that did die, says Dr. Fiskus. Ultimately, we isolated a population of cells that were resistant to very high concentrations of these agents and other agents in the same class.

Dr. Fiskus is presenting the findings Dec. 11 during the American Society of Hematologys 49th Annual Meeting and Exposition in Atlanta.

They found the HDAC inhibitor-resistant cell line resistant to many therapies, including more standard treatment such as chemotherapy, but highly sensitive to heat shock protein 90, or hsp90, inhibitors, another emerging cancer treatment.

As part of their resistance mechanisms, they acquired greater sensitivity to hsp90 inhibitors, says Dr. Bhalla, Cecil F. Whitaker Jr., M.D./Georgia Research Alliance Eminent Scholar in Cancer. This creates a potential combination that can be tested in mouse models and ultimately clinical trials.

HDAC and hsp90 inhibitors are both being studied in combination with other cancer therapies but not each other. However the MCG researchers, who already have published work indicating a synergistic effect, were not surprised by what they found.

Resistance to HDAC inhibitors is going to emerge, so you need a cellular model to understand mec
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Contact: Toni Baker
tbaker@mcg.edu
706-721-4421
Medical College of Georgia  
Source:Eurekalert

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