Costunolide-Induced Apoptosis in Human Leukemia Cells: Involvement of c-Jun N-Terminal Kinase Activation
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概要
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The authors previously reported that costunolide, an active compound isolated from the stem bark of Magnolia sieboldii, induced apoptosis via reactive oxygen species (ROS) and Bcl-2-dependent mitochondrial permeability transition in human leukemia cells. In the present study, the authors investigated whether mitogen-activated protein kinases (MAPKs) are involved in the costunolide-induced apoptosis in human promonocytic leukemia U937 cells. Treatment with costunolide resulted in the significant activation of c-Jun N-terminal kinase (JNK), but not of extracellular-signal-related kinase (ERK1/2) or p38. In vitro kinase assays showed that JNK activity was low in untreated cells but increased dramatically after 30 min of costunolide treatment. U937 cells co-treated with costunolide and sorbitol, a JNK activator, exhibited higher levels of cell death. In addition, inhibition of the JNK pathway using a dominant-negative mutation of c-jun and JNK inhibitor SP600125, significantly prevented costunolide-induced apoptosis. Furthermore, pretreatment with the antioxidant NAC (N-acetyl-L-cysteine) blocked the costunolide-stimulated activation of JNK while the overexpression of Bcl-2 failed to reverse JNK activation. Pretreatment with SP600125 recovered the costunolide-suppressed Bcl-2 expression. These results indicate that costunolide-induced JNK activation acts downstream of ROS but upstream of Bcl-2, and suggest that ROS-mediated JNK activation plays a key role in costunolide-induced apoptosis. Moreover, the administration of costunolide (intraperitoneally once a day for 7 d) significantly suppressed tumor growth and increased survival in 3LL Lewis lung carcinoma-bearing model.
- 日本薬学会の論文
著者
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Lee Kyung-tae
Department Of Life And Nanopharmaceutical Sciences College Of Pharmacy Kyung Hee University
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Lee Kyung-tae
Department Of Biochemistry College Of Pharmacy Kyung Hee University
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Choi Jung-hye
Department Of Internal Medicine Hanyang University
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