Selective Inhibition of IκB Kinase Sensitizes Mantle Cell Lymphoma B Cells to TRAIL by Decreasing Cellular FLIP Level

作者: Gaël Roué , Patricia Pérez-Galán , Mónica López-Guerra , Neus Villamor , Elias Campo

DOI: 10.4049/JIMMUNOL.178.3.1923

关键词: ApoptosisCytotoxic T cellImmunologyCaspaseCell cultureIκB kinaseCancer researchMedicineBortezomibGene knockdownFlip

摘要: In an attempt to circumvent the intrinsic resistance of mantle cell lymphoma (MCL) cells apoptosis, we have analyzed their sensitivity extrinsic apoptotic signal triggered by TRAIL. We show here that TRAIL can trigger apoptosis in a majority MCL lines and primary cultures, irrespective receptor levels, Bcl-2 family members, or caspase regulator expression. was closely linked activity NF-κB p50 factor consequent expression cellular FLIP (c-FLIP), which accumulated into TRAIL-dependent complex resistant cells. c-FLIP transient knockdown overcame TRAIL, while inhibitors differentially modulated cytotoxicity. Indeed, bortezomib increased cytotoxic effects sensitive cells, but led intracellular accumulation c-FLIP, impeding full synergistic interaction. contrast, IκB kinase inhibitor BMS-345541 decreased allowed all samples undergo TRAIL-mediated apoptosis. These results present combination stimulation inhibition as new approach therapy.

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