title: Cellular components involved in the cell death induced by cisplatin in the absence of p53 activation.
abstract: Cisplatin (CDDP) is a DNA damaging agent and is widely used for treating cancer. While the role of p53 in CDDP-induced cell death has been stressed, evidence exists that CDDP can also kill p53-mutated cells. To investigate the latter mechanism, we performed a comparative study using three different human cell types, SNU-16 (a stomach cancer cell-line), U937 (a leukemic cell-line) and 293T (a kidney fibroblast cell-line), which are defective in terms of p53 activation. A focus was placed on Bcl-2 family proteins, reactive oxygen species (ROS), and mitogen-activated protein kinases. Our results suggest that the ability of CDDP to kill these cells can be mediated by JNK, p38 MAPK and ROS, but not by ERK. It was also found that CDDP can increase the ratio of pro-apoptotic/pro-survival Bcl-2 members. While the importance of these components was found to depend on cell type, JNK was commonly involved in the deaths of all cell types examined. Therefore, the JNK pathway appears to be an ideal target for the modulation of the lethal action of CDDP in multiple types of p53-mutated cells.
authors.affiliation: Laboratory of Radiation Tumor Physiology, Korea Institute of Radiological and Medical Sciences, Nowon-gu, Seoul, Korea.
authors.forename: In Hwa
authors.initials: IH
authors.lastname: Bae
authors.forename: Sung Wook
authors.initials: SW
authors.lastname: Kang
authors.forename: Sung Hwan
authors.initials: SH
authors.lastname: Yoon
authors.forename: Hong-Duck
authors.initials: HD
authors.lastname: Um
mesh_terms: D000970:Antineoplastic Agents / Q000627:therapeutic use*; D017209:Apoptosis / Q000187:drug effects*; D002945:Cisplatin / Q000627:therapeutic use*; D005347:Fibroblasts / Q000187:drug effects / Q000378:metabolism; D006801:Humans; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism; D007668:Kidney / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism; D013274:Stomach Neoplasms / Q000188:drug therapy* / Q000378:metabolism; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism*; D020298:U937 Cells / Q000187:drug effects / Q000378:metabolism; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: D000970:Antineoplastic Agents; D019253:Proto-Oncogene Proteins c-bcl-2; D017382:Reactive Oxygen Species; D016159:Tumor Suppressor Protein p53; D048031:JNK Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D002945:Cisplatin