Abstract
Purpose
Drug resistance remains a major challenge for the treatment of high-risk hepatoblastoma (HB). To enhance effectiveness of chemotherapy we modulate apoptosis in HB cells in vitro.
Methods
Viability was monitored in HB cells (HuH6, HepT1) and fibroblasts in monolayer and spheroid cultures treated with ABT-737, obatoclax, HA14-1, and TW-37 and each in combination with CDDP, etoposide, irinotecan, paclitaxel, and DOXO in a MTT assay. Western blot analyses were performed to determine expressions of pro- and anti-apoptotic proteins.
Results
Obatoclax and ABT-737 led to a dose-dependent decrease of viability in HB cells at concentrations above 0.3 μM. TW-37 and HA14-1 were less effective. ABT-737 and obatoclax had additive effects when combined with CDDP, etoposide, irinotecan, paclitaxel, or DOXO. This was also observed for fibroblast, however, for higher drug concentrations. In spheroid cultures, relative expression of Bcl-XL was increased, Bax was decreased, Mcl-1 was low, and Bcl-2 was not detected compared to 2D cultures, denoting an anti-apoptotic state in spheroids. Obatoclax and ABT-737 have overcome the resistance to CDDP. HuH6 cells have shown higher susceptability for apoptosis sensitizers than HepT1.
Conclusion
The data provide evidence that ABT-737 and obatoclax might improve treatment results in children with HB.
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Acknowledgments
The authors wish to acknowledge ABBOTT Laboratories for providing ABT-737.
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Lieber, J., Ellerkamp, V., Wenz, J. et al. Apoptosis sensitizers enhance cytotoxicity in hepatoblastoma cells. Pediatr Surg Int 28, 149–159 (2012). https://doi.org/10.1007/s00383-011-2988-z
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DOI: https://doi.org/10.1007/s00383-011-2988-z