Abstract
KRAS mutant lung cancers have long been considered as untreatable with drugs. Transforming growth factor-β-activated kinase 1 (TAK1) appears to play an anti-apoptotic role in response to multiple stresses and has been reported to be a responsive kinase that regulates cell survival in KRAS-dependent cells. In this study, in order to find a useful approach to treat KRAS mutant lung cancer, we focused on the combined effects of 5Z-7-oxozeaenol, a TAK1 inhibitor, with hyperthermia (HT) in KRAS mutant lung cancer cell line A549. Annexin V-FITC/PI assay, cell cycle analysis, and colony formation assay revealed a significant enhancement in apoptosis induced by HT treatment, when the cells were pre-incubated with 5Z-7-oxozeaenol in a dose-dependent manner. The enhanced apoptosis by 5Z-7-oxozeaenol was accompanied by a significant increase in reactive oxygen species (ROS) generation and loss of mitochondrial membrane potential (MMP). In addition, western blot showed that 5Z-7-oxozeaenol enhanced HT-induced expressions of cleaved caspase-3, cleaved caspase-8, and HSP70 and decreased HT-induced expressions of Bcl-2, p-p38, p-JNK, and LC3. Moreover, 5Z-7-oxozeaenol pre-treatment resulted in a marked elevation of intracellular calcium level which might be associated with endoplasmic reticulum (ER) stress-related pathway. Taken together, our data provides further insights of the mechanism of action of 5Z-7-oxozeaenol and HT treatment, and their potential application as a novel approache to treat patients with KRAS mutant lung cancer.
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Abbreviations
- AIF:
-
Apoptosis-inducing factor
- DMSO:
-
Dimethyl sulfoxide
- DiOC6(3):
-
3,3′-dihexyloxacarbocyanine iodide
- FITC:
-
Fluorescein isothiocyanate
- HE:
-
Hydroethidine
- HPF:
-
Hydroxyphenyl fluorescein
- HT:
-
Hyperthermia
- IP3R:
-
Inositol 1,4,5-trisphosphate receptor
- MAP3K:
-
Mitogen-activated protein kinase kinase kinase
- MMP:
-
Mitochondrial membrane potential
- MKKs:
-
Mitogen-activated protein kinase kinases
- MPTP:
-
Mitochondria permeability transition pore
- NSCLC:
-
Non-small cell lung cancer
- PI:
-
Propidium iodide
- ROS:
-
Reactive oxygen species
- SCLC:
-
Small cell lung cancer
- TAK1:
-
Transforming growth factor-β-activated kinase 1
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Acknowledgments
This work was supported in part by Grant-in-Aid for Challenging Exploratory Research (No. 26670551), Japan society for the Promotion of Science.
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Li, P., Zhao, QL., Jawaid, P. et al. Enhancement of hyperthermia-induced apoptosis by 5Z-7-oxozeaenol, a TAK1 inhibitor, in A549 cells. Cell Stress and Chaperones 21, 873–881 (2016). https://doi.org/10.1007/s12192-016-0712-6
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DOI: https://doi.org/10.1007/s12192-016-0712-6