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- Title
ASK1 mediates apoptotic cell death induced by genotoxic stress.
- Authors
Chen, Zhihong; Seimiya, Hiroyuki; Naito, Mikihiko; Mashima, Tetsuo; Kizaki, Atsuo; Dan, Shingo; Imaizumi, Miki; Ichijo, Hidenori; Miyazono, Kohei; Tsuruo, Takashi
- Abstract
Genotoxic stress-induced apoptosis is mediated by caspase family proteases as triggered by other stimuli. In this study, we found that the DNA-damaging agent cisplatin (cDDP) activated MAP kinase kinase kinase ASK1 and subsequent downstream subgroups of MAP kinase kinase, SEK1 (or MKK4) and MKK3/MKK6, which in turn activated c-Jun N-terminal kinase 1/stress-activated protein kinase (JNK1/SAPK) and p38 MAP kinase prior to caspase family protease activation and the onset of apoptosis in human ovarian carcinoma (OVCAR-3) and human kidney (293T) cells. As reported previously, benzyloxy carbonyl-Asp-CH2OC(O)-2, 6-dichlorobenzene (Z-Asp), a preferential inhibitor of caspase family proteases, blocked the apoptosis of OVCAR-3 cells induced by the genotoxic stress cDDP. Z-Asp, however, did not inhibit ASK1 activation and the subsequent kinase cascades. Overexpression of kinase-negative ASK1 (K709R), which inhibited ASK1 activation and the downstream MKK3-p38 and MKK4-JNK1 pathways, also suppressed the caspase protease activation and apoptosis induced by cDDP. These results indicate that the ASK1 pathway is involved in genotoxic stress-induced apoptosis and mediates apoptosis at a step upstream of caspase protease activation.
- Subjects
APOPTOSIS; PROTEIN kinases; GENETIC toxicology; CELL death
- Publication
Oncogene, 1999, Vol 18, Issue 1, p173
- ISSN
0950-9232
- Publication type
Article
- DOI
10.1038/sj.onc.1202276