Targeting the EMT transcription factor Snail overcomes resistance to osimertinib in EGFR ‐mutant non‐small cell lung cancer

作者：Qiong Qin, Xiaoqing Li, Xingmei Liang, Lili Zeng, Jing Wang, Linlin Sun, Diansheng Zhong · 发表于：Thoracic Cancer · 年份：2021 · DOI：10.1111/1759-7714.13906 · 被引用次数：60 · 研究领域：Advanced Breast Cancer Therapies、Cancer Cells and Metastasis、Cancer-related Molecular Pathways

BACKGROUND: The resistance mechanism of the third generation of epidermal growth factor (EGFR) tyrosine kinase inhibitor (TKI) osimertinib is complex. Epithelial mesenchymal transition (EMT) is a common mechanism of EGFR-TKI acquired resistance. Snail is an important transcription factor related to EMT. Whether targeting Snail can reverse the resistance of osimertinib by downregulating Snail is unknown. METHODS: The presence of EMT in H1975/OR (osimertinib resistance) cells was confirmed by transwell assay. To explore the EMT role in resistance, the expression levels of EMT markers were detected in both parental cells H1975 and resistant cells H1975OR. We used RNA interference technology to knockdown the key regulator Snail in resistant cells. After the interference efficiency was confirmed, changes in EMT-related molecules of Snail were explicitly downregulated, and changes in sensitivity and migration and invasion ability were also examined. We used CDK4/6 inhibitor to test the ability of reversing drug resistance by downregulating Snail. RESULTS: Compared with the H1975 cell line, the H1975/OR resistant cell line showed increased invasiveness, upregulated expression of vimentin and downregulation of E-cadherin. EMT occurred in the H1975/OR resistant cell line. The expression of Snail was upregulated in the osimertinib-resistant cell line H1975/OR. Knockdown of Snail increased the sensitivity of H1975/OR cells to osimertinib. CDK4/6 inhibitor palbociclib could downregulate ...