title: Cross-resistance to death ligand-induced apoptosis in cisplatin-selected HeLa cells associated with overexpression of DDB2 and subsequent induction of cFLIP.
abstract: This work reports the involvement of damaged DNA-binding protein 2 (DDB2), a component involved in the genomic repair of UV damage, in the cross-resistance of cisplatin-selected cell lines to death ligand-mediated apoptosis. The cisplatin-resistant cell line (HR3) exhibits enhanced expression of DDB2 and cross-resistance to UV-induced activation of apoptosis and caspases. This investigation further demonstrates that HR3 cells also exhibited cross-resistance to death ligands [Fas-inducing antibody and tumor necrosis factor (TNF)-alpha]. Depletion of the elevated DDB2 in HR3 cells sensitizes Fas-inducing antibody-induced and TNF-alpha-induced apoptosis. In contrast, the overexpression of DDB2 induces cellular FLICE-like inhibitory protein (cFLIP) expression and further attenuates death ligand-induced apoptosis. Moreover, reverse transcription-polymerase chain reaction and reporter assay indicated that DDB2 could increase both endogenous and exogenous cFLIP mRNA levels. Accordingly, the elimination of cFLIP by antisense oligonucleotides suppresses DDB2 protection. These findings reveal that DDB2 regulates TNF signaling-mediated apoptosis via cFLIP and contributes to acquired cross-resistance. DDB2, while participating in DNA repair, functions as a negative regulator of apoptosis and may therefore have a pivotal role in regulating immune response and cancer-therapeutic efficacy.
authors.affiliation: Tumor Biology Laboratory, Department of Biochemistry, Chang Gung University, Taoyuan, Taiwan 333, Republic of China.
authors.forename: Chun-Ling
authors.initials: CL
authors.lastname: Sun
authors.forename: Chuck C-K
authors.initials: CC
authors.lastname: Chao
mesh_terms: D017209:Apoptosis / Q000187:drug effects*; D053446:CASP8 and FADD-Like Apoptosis Regulating Protein; D002945:Cisplatin / Q000494:pharmacology*; D004260:DNA Repair; D004268:DNA-Binding Proteins / Q000502:physiology*; D019008:Drug Resistance, Neoplasm; D006367:HeLa Cells; D006801:Humans; D047908:Intracellular Signaling Peptides and Proteins / Q000235:genetics*; D012333:RNA, Messenger / Q000032:analysis; D015398:Signal Transduction; D014409:Tumor Necrosis Factor-alpha / Q000502:physiology; D016159:Tumor Suppressor Protein p53 / Q000502:physiology
chemical_list: D053446:CASP8 and FADD-Like Apoptosis Regulating Protein; C506386:CFLAR protein, human; C117669:DDB2 protein, human; D004268:DNA-Binding Proteins; D047908:Intracellular Signaling Peptides and Proteins; D012333:RNA, Messenger; D014409:Tumor Necrosis Factor-alpha; D016159:Tumor Suppressor Protein p53; D002945:Cisplatin