S-Space College of Medicine/School of Medicine (의과대학/대학원) Dept. of Medicine (의학과) Journal Papers (저널논문_의학과)
Acquired resistance of MET-amplified non-small cell lung cancer cells to the MET inhibitor capmatinib
- Issue Date
- Cancer Research and Treatment, Vol.51 No.3, pp.951-962
- Purpose Amplified mesenchymal-epithelial transition factor, MET, is a receptor tyrosine kinase (RTK) that has been considered a druggable target in non-small cell lung cancer (NSCLC). Although multiple MET tyrosine kinase inhibitors (TKIs) are being actively developed for MET-driven NSCLC, the mechanisms of acquired resistance to MET-TKIs have not been well elucidated. To understand the mechanisms of resistance and establish therapeutic strategies, we developed an in vitro model using the MET-amplified NSCLC cell line EBC-1. Materials and Methods We established capmatinib-resistant NSCLC cell lines and identified alternative signaling pathways using 3' mRNA sequencing and human phospho-RTK arrays. Copy number alterations were evaluated by quantitative polymerase chain reaction and cell proliferation assay; activation of RTKs and downstream effectors were compared between the parental cell line EBC-1 and the resistant cell lines. Results We found that EBC-CR1 showed an epidermal growth factor receptor (EGFR)-dependent growth and sensitivity to afatinib, an irreversible EGFR TKI. EBC-CR2 cells that had overexpression of EGFR-MET heterodimer dramatically responded to combined capmatinib with afatinib. In addition, EBC-CR3 cells derived from EBC-CR1 cells that activated EGFR with amplified phosphoinositide-3 kinase catalytic subunit alpha (PIK3CA) were sensitive to combined afatinib with BYL719, a phosphoinositide 3-kinase alpha (PI3K alpha) inhibitor. Conclusion Our in vitro studies suggested that activation of EGFR signaling and/or genetic alteration of downstream effectors like PIK3CA were alternative resistance mechanisms used by capmatinib-resistant NSCLC cell lines. In addition, combined treatments with MET, EGFR, and PI3K alpha inhibitors may be effective therapeutic strategies in capmatinib-resistant NSCLC patients.