Document Detail


Cross-resistance to death ligand-induced apoptosis in cisplatin-selected HeLa cells associated with overexpression of DDB2 and subsequent induction of cFLIP.
MedLine Citation:
PMID:  15644494     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
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:
Chun-Ling Sun; Chuck C-K Chao
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2005-01-11
Journal Detail:
Title:  Molecular pharmacology     Volume:  67     ISSN:  0026-895X     ISO Abbreviation:  Mol. Pharmacol.     Publication Date:  2005 Apr 
Date Detail:
Created Date:  2005-03-22     Completed Date:  2005-04-20     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  0035623     Medline TA:  Mol Pharmacol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1307-14     Citation Subset:  IM    
Affiliation:
Tumor Biology Laboratory, Department of Biochemistry, Chang Gung University, Taoyuan, Taiwan 333, Republic of China.
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MeSH Terms
Descriptor/Qualifier:
Apoptosis / drug effects*
CASP8 and FADD-Like Apoptosis Regulating Protein
Cisplatin / pharmacology*
DNA Repair
DNA-Binding Proteins / physiology*
Drug Resistance, Neoplasm
Hela Cells
Humans
Intracellular Signaling Peptides and Proteins / genetics*
RNA, Messenger / analysis
Signal Transduction
Tumor Necrosis Factor-alpha / physiology
Tumor Suppressor Protein p53 / physiology
Chemical
Reg. No./Substance:
0/CASP8 and FADD-Like Apoptosis Regulating Protein; 0/CFLAR protein, human; 0/DDB2 protein, human; 0/DNA-Binding Proteins; 0/Intracellular Signaling Peptides and Proteins; 0/RNA, Messenger; 0/Tumor Necrosis Factor-alpha; 0/Tumor Suppressor Protein p53; 15663-27-1/Cisplatin

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