TY - JOUR T1 - c-Jun N-terminal Kinase Activation is Required for Apoptotic Cell Death Induced by TNF-related Apoptosis-inducing Ligand plus DNA-damaging Agents in Sarcoma Cell Lines JF - Anticancer Research JO - Anticancer Res SP - 1153 LP - 1160 VL - 26 IS - 2A AU - TAKASHI MIKAMI AU - TAKAAKI KOYAMA AU - TAKASHI KOYAMA AU - ATSUHIRO IMAKIIRE AU - KENGO YAMAMOTO AU - MASAE FURUHATA AU - HIROKO TOYOTA AU - JUNICHIRO MIZUGUCHI Y1 - 2006/03/01 UR - http://ar.iiarjournals.org/content/26/2A/1153.abstract N2 - Background: Tumor necrosis factor (TNF)-related apoptosis-inducing ligand (TRAIL) in combination with a chemotherapeutic agent, cis-diammine dichloroplatinum (CDDP) or doxorubicin (DXR), has recently been demonstrated to result in enhanced apoptotic cell death in the sarcoma cell lines MG-63 and SaOS-2. DNA-damaging agents, such as CDDP induced sustained activation of c-Jun N-terminal kinase (JNK), probably leading to apoptosis. In the present study, whether JNK activation is involved in apoptotic cell death induced by combined treatment with CDDP/DXR and TRAIL was addressed. Results: MG-63 or SaOS-2 cells overexpressing the dominant-negative (dn) form of JNK (dnJNK1) were established by transfection with dnJNK1 cDNA. Following stimulation with the chemotherapeutic agent CDDP or TRAIL, both MG-63 and SaOS-2 cells demonstrated enhanced cell death compared with stimulation by either agent alone, as assayed for apoptosis using annexin V staining or mitochondrial membrane potential using DiOC6 staining. Interestingly, partial inhibition of the cell death induced by the combined treatment with CDDP/DXR and TRAIL was found in MG-63 or SaOS-2 cells overexpressing dnJNK1, suggesting that JNK activation is required for the combined treatment. Moreover, induction of caspase-8 activation by TRAIL or TRAIL plus CDDP/DXR was substantially prevented by dnJNK. Conclusion: Efficient cell death induced by combined treatment with the chemotherapeutic agents CDDP/DXR and TRAIL is involved in JNK activation in the sarcoma cell lines MG-63 and SaOS-2. These results would be useful for treatment modalities of patients with sarcoma. Copyright© 2006 International Institute of Anticancer Research (Dr. John G. Delinassios), All rights reserved ER -