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B in Cancer Cells Does Not Increase Sensitivity to Cytotoxic Drugs1
Laboratory of Medical Chemistry/Medical Oncology, University of Liège, 4000 Liège, Belgium [M. B-A., A-C. H., M-P. M., V. B.]; and Institut National de la Santé et de la Recherche Médicale Unité 487, Institut Gustave-Roussy, 94805 Villejuif, France [M. A., S. C.]
Several reports indicated that nuclear factor
B (NF-
B) activation by cytokines, cytotoxic drugs, or ionizing radiation protects cells against apoptosis. Therefore, we investigated the consequence of NF-
B inhibition on the efficiency of antineoplastic agents. HPB, HCT116, MCF7, and OVCAR-3 cells stably expressing a dominant negative I
B
inhibitor showed a decreased NF-
B activation following treatment with tumor necrosis factor
and various chemotherapeutic agents. However, there was no difference in survival between parental cells and cells expressing mutated I
B
. These studies suggest that, at least in these cell lines, stable NF-
B inhibition did not modify the response to cytotoxic drugs.
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