Abstract
The effect of 17-allylamino-17-demethoxygeldanamycin (17-AAG), an hsp90 inhibitor, alone or in combination with paclitaxel on survival of anaplastic thyroid carcinoma (ATC) was evaluated. In 8505C and CAL62 cells, after treatment of 17-AAG, cell viability decreased, and the percentage of dead cells increased. 17-AAG did not cause cleavage of caspase-3 protein, and change expression of IAPs. Pretreatment of z-VAD-fmk did not alter cell viability and the percentage of dead cells. In 17-AAG-treated cells, knockdown of p53 rescued growth inhibition, while cycloheximide attenuated cell death. When cells were treated with both 17-AAG and paclitaxel, all of the combination index values were higher than 1, indicating antagonism between 17-AAG and paclitaxel. In 17-AAG- and paclitaxel-treated cells, compared with paclitaxel alone-treated cells, the protein levels of hsp90, hsp70, and hsc70 increased. In conclusion, our results suggest that 17-AAG induces non-apoptotic cell death requiring de novo protein synthesis in ATC cells. Moreover, these results demonstrate that 17-AAG antagonizes paclitaxel with concomitant alterations in hsp90 client proteins in ATC cells.
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Abbreviations
- 17-AAG:
-
17-Allylamino-17-demethoxygeldanamycin
- Act D:
-
Actinomycin D
- ATC:
-
Anaplastic thyroid carcinoma
- CHX:
-
Cycloheximide
- CI:
-
Combination index
- DMSO:
-
Dimethylsulfoxide
- FTC:
-
Follicular thyroid carcinoma
- hsc70:
-
Heat-shock cognate 70
- hsp70:
-
Heat-shock protein 70
- hsp90:
-
Heat-shock protein 90
- IAP:
-
Inhibitor of apoptosis protein
- MTC:
-
Medullary thyroid carcinoma
- PTC:
-
Papillary thyroid carcinoma
- siRNA:
-
Small interfering RNA
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Acknowledgments
This research was supported by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (2012R1A1A2008786) to S.J. Lee, Republic of Korea.
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The authors declare that there is no conflict of interest that could be perceived as prejudicing the impartiality of the research reported.
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Kim, S.H., Kang, J.G., Kim, C.S. et al. The effect of 17-allylamino-17-demethoxygeldanamycin alone or in combination with paclitaxel on anaplastic thyroid carcinoma cells. Endocrine 48, 886–893 (2015). https://doi.org/10.1007/s12020-014-0371-2
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DOI: https://doi.org/10.1007/s12020-014-0371-2