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Ursolic acid sensitizes radioresistant NSCLC cells expressing HIF‑1α through reducing endogenous GSH and inhibiting HIF‑1α

  • Authors:
    • Bing Song
    • Qian Zhang
    • Maohu Yu
    • Xinrong Qi
    • Gang Wang
    • Linlin Xiao
    • Qiyi Yi
    • Wensen Jin
  • View Affiliations / Copyright

    Affiliations: Department of Cardiology, First Affiliated Hospital, Anhui Medical University, Hefei, Anhui 230032, P.R. China, Teaching and Research Section of Nuclear Medicine, Anhui Medical University, Hefei, Anhui 230032, P.R. China
    Copyright: © Song et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Pages: 754-762
    |
    Published online on: December 7, 2016
       https://doi.org/10.3892/ol.2016.5468
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Abstract

In previous studies, the present authors demonstrated that effective sensitization of ionizing radiation‑induced death of tumor cells, including non‑small cell lung cancer (NSCLC) cells, could be produced by oleanolic acid (OA), a pentacyclic triterpenoid present in plants. In the present study, it was investigated whether ursolic acid (UA), an isomer of OA, had also the capacity of sensitizing radioresistant NSCLC cells. The radioresistant cell line H1299/M‑hypoxia inducible factor‑1α (HIF‑1α) was established by transfection with a recombinant plasmid expressing mutant HIF‑1α (M‑HIF‑1α). Compared with parental H1299 cells and H1299 cells transfected with empty plasmid, H1299/M‑HIF‑1α cells had lower radiosensitivity. Following the use of UA to treat NSCLC cells, elevation of the radiosensitivity of cells was observed by MTT assay. The irradiated H1299/M‑HIF‑1α cells were more sensitive to UA pretreatment than the irradiated cells with empty plasmid and control. The alteration of DNA damage in the irradiated cells was further measured using micronucleus (MN) assay. The combination of UA treatment with radiation could induce the increase of cellular MN frequencies, in agreement with the change in the tendency observed in the cell viability assay. It was further shown that the endogenous glutathione (GSH) contents were markedly attenuated in the differently irradiated NSCLC cells with UA (80 µmol/l) pretreatment through glutathione reductase/5,5'‑dithiobis‑(2‑nitrob‑enzoic acid) (DTNB) recycling assay. The results revealed that UA treatment alone could effectively decrease the GSH content in H1299/M‑HIF‑1α cells. In addition, the inhibition of HIF‑1α expression in radioresistant cells was confirmed by western blotting. It was then concluded that UA could upregulate the radiosensitivity of NSCLC cells, and in particular reduce the refractory response of cells expressing HIF‑1α to ionizing radiation. The primary mechanism is associated with reduction of endogenous GSH and inhibition of high expression of intracellular HIF‑1α. UA should therefore be deeply studied as a potential radiosensitizing reagent for NSCLC radiotherapy.
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Copy and paste a formatted citation
Spandidos Publications style
Song B, Zhang Q, Yu M, Qi X, Wang G, Xiao L, Yi Q and Jin W: Ursolic acid sensitizes radioresistant NSCLC cells expressing HIF‑1α through reducing endogenous GSH and inhibiting HIF‑1α. Oncol Lett 13: 754-762, 2017.
APA
Song, B., Zhang, Q., Yu, M., Qi, X., Wang, G., Xiao, L. ... Jin, W. (2017). Ursolic acid sensitizes radioresistant NSCLC cells expressing HIF‑1α through reducing endogenous GSH and inhibiting HIF‑1α. Oncology Letters, 13, 754-762. https://doi.org/10.3892/ol.2016.5468
MLA
Song, B., Zhang, Q., Yu, M., Qi, X., Wang, G., Xiao, L., Yi, Q., Jin, W."Ursolic acid sensitizes radioresistant NSCLC cells expressing HIF‑1α through reducing endogenous GSH and inhibiting HIF‑1α". Oncology Letters 13.2 (2017): 754-762.
Chicago
Song, B., Zhang, Q., Yu, M., Qi, X., Wang, G., Xiao, L., Yi, Q., Jin, W."Ursolic acid sensitizes radioresistant NSCLC cells expressing HIF‑1α through reducing endogenous GSH and inhibiting HIF‑1α". Oncology Letters 13, no. 2 (2017): 754-762. https://doi.org/10.3892/ol.2016.5468
Copy and paste a formatted citation
x
Spandidos Publications style
Song B, Zhang Q, Yu M, Qi X, Wang G, Xiao L, Yi Q and Jin W: Ursolic acid sensitizes radioresistant NSCLC cells expressing HIF‑1α through reducing endogenous GSH and inhibiting HIF‑1α. Oncol Lett 13: 754-762, 2017.
APA
Song, B., Zhang, Q., Yu, M., Qi, X., Wang, G., Xiao, L. ... Jin, W. (2017). Ursolic acid sensitizes radioresistant NSCLC cells expressing HIF‑1α through reducing endogenous GSH and inhibiting HIF‑1α. Oncology Letters, 13, 754-762. https://doi.org/10.3892/ol.2016.5468
MLA
Song, B., Zhang, Q., Yu, M., Qi, X., Wang, G., Xiao, L., Yi, Q., Jin, W."Ursolic acid sensitizes radioresistant NSCLC cells expressing HIF‑1α through reducing endogenous GSH and inhibiting HIF‑1α". Oncology Letters 13.2 (2017): 754-762.
Chicago
Song, B., Zhang, Q., Yu, M., Qi, X., Wang, G., Xiao, L., Yi, Q., Jin, W."Ursolic acid sensitizes radioresistant NSCLC cells expressing HIF‑1α through reducing endogenous GSH and inhibiting HIF‑1α". Oncology Letters 13, no. 2 (2017): 754-762. https://doi.org/10.3892/ol.2016.5468
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