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New approach to chronic lymphocytic leukemia treatment

Date:
March 14, 2014
Source:
Norris Cotton Cancer Center/Dartmouth-Hitchcock Medical Center
Summary:
A novel and unique approach to treating Chronic Lymphocytic Leukemia (CLL), a form of blood cancer that often requires repeated chemotherapy treatments to which it grows resistant, as been developed by scientists. Unlike other novel therapies that have shown promise in the treatment of CLL, this approach is unique because it does not directly target proteins within the B-cell receptor pathway, but instead uses novel model systems that reverse the pro-survival effects of the microenvironment.

Dartmouth researchers have developed a novel and unique approach to treating Chronic Lymphocytic Leukemia (CLL), a form of blood cancer that often requires repeated chemotherapy treatments to which it grows resistant. The researchers, led by Alexey V. Danilov, MD, PhD, assistant professor at the Geisel School of Medicine at Dartmouth and Hematologist-Oncologist at the Norris Cotton Cancer Center, modeled the lymph node microenvironment where CLL cells are found in the laboratory. They were able to disrupt the activity of a pathway (NF-kappaB) that ensures the survival and resistance of the CLL cells in such microenvironments.

The study findings were published in the March 15, 2014 issue of Clinical Cancer Research.

“In this in vitro microenvironment, we used MLN4924 to disrupt the activity of the NF-kappaB pathway by targeting Nedd8, which controls activation of NF-kappaB,” said Danilov. “This decreased the survival of CLL cells and re-sensitized them to conventional chemotherapy as well as novel agents. Because the CLL cells used were obtained from patients with this disorder, these findings are immediately relevant to the clinic.”

Danilov says that unlike other novel therapies that have shown promise in the treatment of CLL, this approach is unique because it does not directly target proteins within the B-cell receptor pathway. He also notes that other research models that mimic the natural lymph node microenvironment have typically induced prolonged survival of CLL cells and made them resistant to in vitro chemotherapy. This research used novel model systems which reversed the pro-survival effects of the microenvironment.

The researchers are now working to understand the intricate mechanisms of how MLN4924 decreased the survival of CLL cells. Once they understand the mechanisms involved, new therapeutic approaches and drug combinations can be developed for use in animal studies of CLL, and may ultimately lead to a clinical trial with human patients.


Story Source:

The above story is based on materials provided by Norris Cotton Cancer Center/Dartmouth-Hitchcock Medical Center. Note: Materials may be edited for content and length.


Journal Reference:

  1. J. C. Godbersen, L. A. Humphries, O. V. Danilova, P. E. Kebbekus, J. R. Brown, A. Eastman, A. V. Danilov. The Nedd8-Activating Enzyme Inhibitor MLN4924 Thwarts Microenvironment-Driven NF-B Activation and Induces Apoptosis in Chronic Lymphocytic Leukemia B Cells. Clinical Cancer Research, 2014; 20 (6): 1576 DOI: 10.1158/1078-0432.CCR-13-0987

Cite This Page:

Norris Cotton Cancer Center/Dartmouth-Hitchcock Medical Center. "New approach to chronic lymphocytic leukemia treatment." ScienceDaily. ScienceDaily, 14 March 2014. <www.sciencedaily.com/releases/2014/03/140314111344.htm>.
Norris Cotton Cancer Center/Dartmouth-Hitchcock Medical Center. (2014, March 14). New approach to chronic lymphocytic leukemia treatment. ScienceDaily. Retrieved October 23, 2014 from www.sciencedaily.com/releases/2014/03/140314111344.htm
Norris Cotton Cancer Center/Dartmouth-Hitchcock Medical Center. "New approach to chronic lymphocytic leukemia treatment." ScienceDaily. www.sciencedaily.com/releases/2014/03/140314111344.htm (accessed October 23, 2014).

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