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c-FLIP mediates resistance of Hodgkin/Reed-Sternberg cells to death receptor-induced apoptosis

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Item Type:Article
Title:c-FLIP mediates resistance of Hodgkin/Reed-Sternberg cells to death receptor-induced apoptosis
Creators Name:Mathas, S. and Lietz, A. and Anagnostopoulos, I. and Hummel, F. and Wiesner, B. and Janz, M. and Jundt, F. and Hirsch, B. and Joehrens-Leder, K. and Vornlocher, H.P. and Bommert, K. and Stein, H. and Doerken, B.
Abstract:Resistance to death receptor-mediated apoptosis is supposed to be important for the deregulated growth of B cell lymphoma. Hodgkin/Reed-Sternberg (HRS) cells, the malignant cells of classical Hodgkin's lymphoma (cHL), resist CD95-induced apoptosis. Therefore, we analyzed death receptor signaling, in particular the CD95 pathway, in these cells. High level CD95 expression allowed a rapid formation of the death-inducing signaling complex (DISC) containing Fas-associated death domain-containing protein (FADD), caspase-8, caspase-10, and most importantly, cellular FADD-like interleukin 1beta-converting enzyme-inhibitory protein (c-FLIP). The immunohistochemical analysis of the DISC members revealed a strong expression of CD95 and c-FLIP overexpression in 55 out of 59 cases of cHL. FADD overexpression was detectable in several cases. Triggering of the CD95 pathway in HRS cells is indicated by the presence of CD95L in cells surrounding them as well as confocal microscopy showing c-FLIP predominantly localized at the cell membrane. Elevated c-FLIP expression in HRS cells depends on nuclear factor (NF)-{kappa}B. Despite expression of other NF-{kappa}B-dependent antiapoptotic proteins, the selective down-regulation of c-FLIP by small interfering RNA oligoribonucleotides was sufficient to sensitize HRS cells to CD95 and tumor necrosis factor-related apoptosis-inducing ligand-induced apoptosis. Therefore, c-FLIP is a key regulator of death receptor resistance in HRS cells.
Keywords:Lymphoma, CD95 Antigen, TRAIL Protein, NF-{kappa} B, siRNA
Source:Journal of Experimental Medicine
Publisher:Rockefeller University Press
Page Range:1041-1052
Date:19 April 2004
Official Publication:https://doi.org/10.1084/jem.20031080
PubMed:View item in PubMed

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