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Cell Signal. 2007 Oct 17 Taxol-induced mitochondrial stress in melanoma cells is mediated by activation of c-Jun N-terminal kinase (JNK) and p38 pathways via uncoupling protein 2 Taxol resulted in the activation of apoptosis signal regulated kinase (ASK)1, c-jun NH(2)-terminal kinase (JNK), p38(MAPK) and extracellular-regulated kinase (ERK) together with the downregulation of uncoupling protein 2 (UCP2) reactive oxygen species (ROS) were induced and DNA-binding activity of the transcription factors AP-1, ATF-2 and ELK-1 was enhanced Ultimately, cytochrome c was released, and caspases-9 and -3 as well as PARP were cleaved Pretreatment of melanoma cells with the JNK inhibitor (SP600125) or the p38 inhibitor (SB203580) blocked taxol-induced UCP2 downregulation, ROS generation and apoptosis, whereas the ERK inhibitor (PD98059) had no such effect taxol-induced mitochondrial stress occurs through the activation of both JNK and p38 pathways a novel role for UCP2 |
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