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    Please use this identifier to cite or link to this item: http://ir.nhri.org.tw/handle/3990099045/2757


    Title: Activation of c-Jun NH2-terminal kinase and subsequent CPP32/Yama during topoisomerase inhibitor beta-Lapachone-induced apoptosis through an oxidation-dependent pathway
    Authors: Shiah, SG;Chuang, SE;Chau, YP;Shen, SC;Kuo, ML
    Contributors: National Institute of Cancer Research
    Abstract: beta-Lapachone (beta-Lap) has been found to inhibit DNA topoisomerases (Topos) by a mechanism distinct from that of other commonly known Topo inhibitors. Here, we demonstrated a pronounced elevation of H2O2 and O-2(-) in human leukemia HL-60 cells treated with beta-Lap. Treatment with other Topo poisons, such as camptothecin (CPT), VP-16, and GL331, did not have the same effect. On the other hand, antioxidant vitamin C (Vit C) treatment effectively antagonized beta-Lap-induced apoptosis. This suggested that a reactive oxygen species (ROS)-related pathway was involved in beta-Lap-induced apoptosis program. We also found that c-Jun NH2-terminal kinase (JNK) but not p38 mitogen-activated protein kinase or extracellular signal-regulated kinase 1/2 was persistently activated in apoptosis induced by beta-Lap. Overexpression of a dominant-negative mutant mitogen-activated protein kinase kinase kinase I (MEKK1-DN) or treatment with JNK-specific antisense oligonucleotide or Vit C all prevented beta-Lap-induced JNK activation and the subsequent apoptosis. Only the expression of MEKK1-DN, not Vit C treatment, blocked the JNK activity induced by CPT, VP-16, or GL331. These results confirm again that ROS acts as a mediator for JNK activation during beta-Lap-induced apoptosis. Furthermore, we found that beta-Lap can stimulate CPP32/Yama activity, which was, however, markedly inhibited by the MEKK1-DN expression or Vit C treatment. Again, CPT-induced CPP32/Yama activation can be abolished by MEKK1-DN but not by Vit C treatment. Taken together, these results indicate that beta-Lap but not other Topo inhibitors triggers apoptosis signaling, i.e., JNK and subsequent CPP32/Yama activation are mediated by the generation of ROS.
    Keywords: Oncology
    Date: 1999-01-15
    Relation: Cancer Research. 1999 Jan;59(2):391-398.
    Link to: http://cancerres.aacrjournals.org/cgi/content/abstract/59/2/391
    JIF/Ranking 2023: http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=NHRI&SrcApp=NHRI_IR&KeyISSN=0008-5472&DestApp=IC2JCR
    Cited Times(WOS): https://www.webofscience.com/wos/woscc/full-record/WOS:000078092900025
    Cited Times(Scopus): http://www.scopus.com/inward/record.url?partnerID=HzOxMe3b&scp=0033556233
    Appears in Collections:[莊雙恩] 期刊論文

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