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

Thoracic Cancer

Qiong Qin¹  Xingmei Liang¹  Lili Zeng¹  Diansheng Zhong¹  Xiaoqing Li²  Linlin Sun³  Jing Wang³ 

[1] Department of Oncology Tianjin Medical University General Hospital Tianjin China;Phase I clinical trail Department, Tianjin Medical University Cancer Institute and Hospital Tianjin China;Tianjin Lung Cancer Institute Tianjin Medical University General Hospital Tianjin China;

关键词: acquired resistance;    CDK4/6 inhibitor;    epithelial‐mesenchymal transition (EMT);    Snail;    tyrosine kinase inhibitor (TKI);   

DOI  :  10.1111/1759-7714.13906

来源: DOAJ

【 摘 要 】

Abstract 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 the expression of Snail. CDK 4/6 inhibitor palbociclib combined with osimertinib could reverse the resistance of osimertinib in H1975/OR. Conclusions Snail plays an important role in the third generation of EGFR‐TKI osimertinib resistance, which may be reversed by downregulating Snail.

【 授权许可】

Unknown