Abstract
The previous studies by this author group has shown that paclitaxel, a mitotic inhibitor used in breast cancer chemotherapy, inhibits cell growth via induction of Raf-1-dependent apoptosis. In this article, the role of autophagy in paclitaxel anticancer action was investigated using v-Ha-ras-transformed NIH 3T3 cells. Paclitaxel induced a notable increase in the number of fluorescent particles labeled with monodansylcadaverine (MDC), a specific marker for autophagic vacuoles. MDC-labeled vacuoles clearly exhibited the fluorescent-tagged LC3 in cells transiently overexpressing GFP-LC3 (a protein that associates with autophagosome membranes). However, autophagy inhibition with 3-methyladenine (3-MA) failed to rescue v-Ha-ras-transformed NIH 3T3 cells from paclitaxel-induced cell death. More interestingly, the apoptosis inhibition by overexpression of the X-linked inhibitor of apoptosis (XIAP) did not fully block the cell death by paclitaxel, implying that apoptosis inhibition might accelerate the autophagic components of the paclitaxel response. Conversely, Raf-1 shRNA expression protected against paclitaxel-induced cell death through the simultaneous inhibition of both autophagy and apoptosis. These results suggest that both autophagy and apoptosis act as cooperative partners to induce cell death in v-Ha-ras-transformed NIH 3T3 cells treated with paclitaxel.
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This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education, Science and Technology (2009-0064464).
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Eum, KH., Lee, M. Crosstalk between autophagy and apoptosis in the regulation of paclitaxel-induced cell death in v-Ha-ras-transformed fibroblasts. Mol Cell Biochem 348, 61–68 (2011). https://doi.org/10.1007/s11010-010-0638-8
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DOI: https://doi.org/10.1007/s11010-010-0638-8