Summary
Chemotherapy is usually the subsequent treatment for non-small cell lung cancer patients with acquired radioresistance after long-term fractionated radiotherapy. However, few studies have focused on the selection of chemotherapeutic drugs to treat lung adenocarcinoma patients with radioresistance. Our study compared the sensitivity changes of lung adenocarcinoma cells to conventional chemotherapeutic drugs under radioresistant circumstances by using three lung adenocarcinoma cell models, which were irradiated with fractionated X-rays at a total dose of 60 Gy. The results showed that the toxicities of paclitaxel, docetaxel and SN-38 were increased in radioresistant cells. The IC50 values of docetaxel and SN-38 decreased 0 ~ 3 times and 3 ~ 36 times in radioresistant cells, respectively. Notably, the A549 radioresistant cells were approximately 36 times more sensitive to SN-38 than the parental cells. Further results revealed that the downregulation of the efflux transporter BCRP by long-term fractionated irradiation was an important factor contributing to the increased cytotoxicity of SN-38. In addition, the reported miRNAs and transcriptional factors that regulate BCRP did not participate in the downregulation. In conclusion, these results presented important data on the sensitivity changes of lung adenocarcinoma cells to chemotherapeutic drugs after acquiring radioresistance and suggested that irinotecan (the prodrug of SN-38) might be a promising drug candidate for lung adenocarcinoma patients with acquired radioresistance.
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The authors thank Prof. Huidi Jiang and Prof. Su Zeng from the College of Pharmaceutical Sciences, Zhejiang University, for their kind advice and help.
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The work was supported by the Zhejiang Provincial Natural Science Foundation of China under Grant No. LQ19H310001, Zhejiang Provincial Medicine and Health Science Foundation (grant No. 2020RC027) and National Natural Scientific Foundation of China (81803631, 81773242).
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Shirong Zhang, Shenglin Ma and Yuqing Wang conceived and designed the study. Yuqing Wang, Jie Huang, Qiong Wu and Jingjing Zhang performed the experiments. Yuqing Wang wrote the paper. Shirong Zhang, Shenglin Ma and Zhiyuan Ma reviewed and edited the manuscript.
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Wang, Y., Huang, J., Wu, Q. et al. Downregulation of breast cancer resistance protein by long-term fractionated radiotherapy sensitizes lung adenocarcinoma to SN-38. Invest New Drugs 39, 458–468 (2021). https://doi.org/10.1007/s10637-020-01003-3
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DOI: https://doi.org/10.1007/s10637-020-01003-3