Abstract
We have previously shown that the death receptor ligand TRAIL (tumor necrosis factor-related apoptosis-inducing ligand) induces an increase of intracellular C16-ceramide in sensitive SW480 but not in resistant SW620 cells. Resistance in SW620 cells was overcome by exogenous ceramide, leading us to propose that defective ceramide signaling contributes to TRAIL resistance. In this study we found that the increase in C16-ceramide in SW480 cells was inhibited by fumonisin B1, an inhibitor of ceramide synthases (CerS). Protein analysis revealed that TRAIL-resistant SW620 cells expressed lower levels of ceramide synthase 6 (CerS6, also known as longevity assurance homologue 6), which prompted us to investigate the effect of CerS6 modulation on TRAIL phenotype. RNAi against CerS6 resulted in a specific and significant decrease of the C16-ceramide species, which was sufficient to inhibit TRAIL-induced apoptosis. In cells with decreased levels of CerS6, caspase-3 was activated but failed to translocate into the nucleus. CerS6 localized primarily to the perinuclear region, suggesting this enzyme may be important in regulation of nuclear permeability. Moderate elevation in CerS6 expression was sufficient to reverse TRAIL resistance in SW620 cells. These results suggest that modulation of CerS6 expression may constitute a new therapeutic strategy to alter apoptotic susceptibility.
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Acknowledgements
We thank Rick Peppler and Kylie Martin for assistance with flow cytometry experiments, Dr Jacek Bielawski of the Lipidomics Core Facility for assistance with the mass spectrophotometric characterization of ceramide profiles, Dr Kaushal Rege for providing the EDGE3′3 polymer and Tejas Tirodkar for technical assistance. We also thank Dr Yusuf Hannun for reviewing our data and making insightful suggestions.
This work was supported by 1P20-RR17698 NIH COBRE award to CVJ; R01 NIH/NIA AG016583 and NIH/NCI P01CA097132 awards to LMO; CA-088932, DE016572 and CA-097132 awards to BO; NIH/NGA: 1T32ES012878 ‘Training Program in Environmental Stress Signaling’ to TM and by a scholarship from the Abney Foundation to SWG. The MUSC Lipidomics Core Facility (NIH C06 RR018823) and the Flow Cytometry and Cell Sorting Shared Resource Facility were in part supported by MUSC and the Hollings Cancer Center.
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White-Gilbertson, S., Mullen, T., Senkal, C. et al. Ceramide synthase 6 modulates TRAIL sensitivity and nuclear translocation of active caspase-3 in colon cancer cells. Oncogene 28, 1132–1141 (2009). https://doi.org/10.1038/onc.2008.468
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DOI: https://doi.org/10.1038/onc.2008.468
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