
“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 said 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.
Date: March 14, 2014