Abstract
Hypoxia changes the responses of cancer cells to many chemotherapy agents, resulting in chemoresistance. The underlying molecular mechanism of hypoxia-induced drug resistance remains unclear. Pim-1 is a survival kinase, which phosphorylates Bad at serine 112 to antagonize drug-induced apoptosis. Here we show that hypoxia increases Pim-1 in a hypoxia-inducible factor-1α-independent manner. Inhibition of Pim-1 function by dominant-negative Pim-1 dramatically restores the drug sensitivity to apoptosis induced by chemotherapy under hypoxic conditions in both in vitro and in vivo tumor models. Introduction of siRNAs for Pim-1 also resensitizes cancer cells to chemotherapy drugs under hypoxic conditions, whereas forced overexpression of Pim-1 endows solid tumor cells with resistance to cisplatin, even under normoxia. Dominant-negative Pim-1 prevents a decrease in mitochondrial transmembrane potential in solid tumor cells, which is normally induced by cisplatin (CDDP), followed by the reduced activity of Caspase-3 and Caspase-9, indicating that Pim-1 participates in hypoxia-induced drug resistance through the stabilization of mitochondrial transmembrane potential. Our results demonstrate that Pim-1 is a pivotal regulator involved in hypoxia-induced chemoresistance. Targeting Pim-1 may improve the chemotherapeutic strategy for solid tumors.
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Abbreviations
- CCCP:
-
carbonylcyanide m-chlorophenylhydrazone
- CDDP:
-
cisplatin
- dnPim-1:
-
dominant-negative Pim-1
- HIF-1:
-
hypoxia-inducible factor-1
- HRE:
-
hypoxia response element
- MTP:
-
mitochondrial transmembrane potential
- TMRE:
-
tetramethylrhodamine, ethylester, perchlorate
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Acknowledgements
This work was supported in part by the NIHRO1CA (089266 Lee MH), Grants-in-Aid for Scientific Research from the Japan Society for the Promotion of Science (JSPS) (Chen J), Grants-in-Aid for Cancer Research from the Japanese Ministry of Education, Culture, Sports, Science and Technology (Kobayashi M), US Department of Defense Breast Cancer Research Program of the Office of the Congressionally Directed Medical Research Programs (DOD SIDA BC062166 Yeung SJ & Lee MH) and Cancer Center Core Grant (CA16672). We thank Dr BQ Vuong for providing the pCDNA3.1-His-SOCS1 plasmid. We thank Mrs Shirley Ware-Gully for her assistance in preparing the article.
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Supplementary Information accompanies the paper on the Oncogene website (http://www.nature.com/onc)
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Chen, J., Kobayashi, M., Darmanin, S. et al. Pim-1 plays a pivotal role in hypoxia-induced chemoresistance. Oncogene 28, 2581–2592 (2009). https://doi.org/10.1038/onc.2009.124
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DOI: https://doi.org/10.1038/onc.2009.124
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