mTORC1 inhibitor RAD001 (everolimus) enhances non-small cell lung cancer cell radiosensitivity in vitro via suppressing epithelial-mesenchymal transition

Acta Pharmacologica Sinica
Yu ChenYuan Chen

Abstract

Resistance to radiotherapy causes non-small cell lung cancer (NSCLC) treatment failure associated with local recurrence and metastasis. Thus, understanding the radiosensitization of NSCLC cells is crucial for developing new treatments and improving prognostics. mTORC1 has been shown to regulate tumor cell radiosensitivity, but the underlying mechanisms are unclear. Moreover, mTORC1 also regulates epithelial-mesenchymal transition (EMT) that is important to metastasis and recurrence. In this study we explored whether mTORC1 regulated NSCLC cell radiosensitivity by altering EMT. We performed immunohistichemical analysis using tumor, adjacent and normal tissues from 50 NSCLC patients, which confirmed significantly elevated mTOR protein expression in NSCLC tissue. Then we used NCI-H460 and NCI-H661 cell lines to examine the effects of the mTORC1 inhibitor RAD001 (everolimus) on in vitro radiosensitivity, protein expression and dose-survival curves. RAD001 (10 nmol/L) significantly inhibited the mTORC1 pathway in both the cell lines. Pretreatment with RAD001 (0.1 nmol/L) enhanced the radiosensitivity in NCI-H661 cells with wild-type PIK3CA and KRAS but not in NCI-H460 cells with mutant PIK3CA and KRAS; the sensitivity enhancement ra...Continue Reading

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Citations

Feb 15, 2020·Canadian Journal of Physiology and Pharmacology·Guiqin HouZhaoming Lu
Jan 14, 2020·Journal of Oncology·Yunseo WooYu-Jin Jung
May 10, 2021·Biomedicine & Pharmacotherapy = Biomédecine & Pharmacothérapie·Zijing LiuXin Jiang

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Methods Mentioned

BETA
X-ray
protein assay
light microscopy
confocal

Software Mentioned

GraphPad Prism
pheatmap
SPSS
GraphPad
R

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