title: Essential role of c-Jun-NH2-terminal kinase on synergy induction of apoptosis by TRAIL plus ADM in ADM resistant MCF-7/ADM cells.
abstract: Combined treatment modalities using tumor necrosis factor related apoptosis-inducing ligand L (TRAIL) and cytotoxic drugs revealed highly additive effects in some tumor cell lines. Little is known about the efficacy and underlying mechanistic effects of the modalities in chemoresistant tumor cells. The purpose of this study is to investigate the possible role of JNK in the synergistic effect in Doxorubicin (Adriamycin, ADM) resistant MCF-7/ADM cells. Here we showed that the JNK pathway was activated slightly by TRAIL in MCF-7/ADM cell lines and was enhanced by the combination of the two treatments. Inhibition of JNK activity by transfection with dominant-negative JNK blocks TRAIL plus ADM induced-apoptosis significantly, and selective stimulation of the JNK pathway sensitizes ADM resistant breast cancer cells to ADM and TRAIL co-treatment through activation of mitochondria-regulated apoptotic pathway. We conclude that the JNK pathway plays an important role in mediating TRAIL plus ADM induced-apoptosis in breast cancer cells.
authors.affiliation: Cancer Biology Research Center, Tongji Hospital, Tongji Medical School, Huazhong, University of Science and Technology, 1095 Jiefang Avenue, Wuhan, Hubei 430030, P.R. China.
authors.forename: Fang
authors.initials: F
authors.lastname: Li
authors.forename: Li
authors.initials: L
authors.lastname: Meng
authors.forename: Hui
authors.initials: H
authors.lastname: Xing
authors.forename: Jianfeng
authors.initials: J
authors.lastname: Zhou
authors.forename: Shixuan
authors.initials: S
authors.lastname: Wang
authors.forename: Lei
authors.initials: L
authors.lastname: Huang
authors.forename: Gang
authors.initials: G
authors.lastname: Xu
authors.forename: Huaishi
authors.initials: H
authors.lastname: Zhu
authors.forename: Yunping
authors.initials: Y
authors.lastname: Lu
authors.forename: Ding
authors.initials: D
authors.lastname: Ma
mesh_terms: D000873:Anthracenes / Q000494:pharmacology; D000903:Antibiotics, Antineoplastic / Q000494:pharmacology; D017209:Apoptosis / Q000187:drug effects / Q000502:physiology*; D051017:Apoptosis Regulatory Proteins / Q000494:pharmacology*; D001943:Breast Neoplasms / Q000378:metabolism / Q000473:pathology; D053181:Caspase 8; D053453:Caspase 9; D020169:Caspases / Q000378:metabolism; D045744:Cell Line, Tumor; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D045304:Cytochromes c / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D004317:Doxorubicin / Q000494:pharmacology*; D019008:Drug Resistance, Neoplasm; D004357:Drug Synergism; D005260:Female; D005434:Flow Cytometry; D006801:Humans; D048031:JNK Mitogen-Activated Protein Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism / Q000502:physiology*; D008562:Membrane Glycoproteins / Q000494:pharmacology*; D008928:Mitochondria / Q000187:drug effects / Q000378:metabolism; D010766:Phosphorylation / Q000187:drug effects; D011065:Poly(ADP-ribose) Polymerases / Q000378:metabolism; D047428:Protein Kinase Inhibitors / Q000494:pharmacology; D053221:TNF-Related Apoptosis-Inducing Ligand; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*
chemical_list: D000873:Anthracenes; D000903:Antibiotics, Antineoplastic; D051017:Apoptosis Regulatory Proteins; D008562:Membrane Glycoproteins; D047428:Protein Kinase Inhibitors; D053221:TNF-Related Apoptosis-Inducing Ligand; C505653:TNFSF10 protein, human; D014409:Tumor Necrosis Factor-alpha; C432165:pyrazolanthrone; D004317:Doxorubicin; D045304:Cytochromes c; D011065:Poly(ADP-ribose) Polymerases; D048031:JNK Mitogen-Activated Protein Kinases; C505530:CASP8 protein, human; C506433:CASP9 protein, human; D053181:Caspase 8; D053453:Caspase 9; D020169:Caspases