Abstract
Osimertinib, a third-generation epidermal growth factor receptor tyrosine kinase inhibitor (EGFR-TKI), has demonstrated significant clinical benefits in the treatment of EGFR-mutated non-small cell lung cancer (NSCLC). However, inevitable acquired resistance to osimertinib limits its clinical utility, and there is a lack of effective countermeasures. Here, we established osimertinib-resistant cell lines and performed drug library screening. This screening identified ivacaftor, a cystic fibrosis transmembrane conductance regulator (CFTR) potentiator, as a synergistic enhancer of osimertinib-induced anti-tumor activity both in vitro and in vivo. Mechanistically, ivacaftor facilitated the colocalization of CFTR and PTEN on the plasma membrane to promote the function of PTEN, subsequently inhibiting the PI3K/AKT signaling pathway and suppressing tumor growth. In summary, our study suggests that activating CFTR enhances osimertinib-induced anti-tumor activity by regulating the PTEN-AKT axis. Furthermore, ivacaftor and osimertinib constitute a potential combination strategy for treating osimertinib-resistant EGFR-mutated NSCLC patients.

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Acknowledgements
This work was supported by Zhejiang Major R&D programs (2021C03042), Key R&D Program of Zhejiang Respiratory Disease (2023C03069), and Zhejiang Provincial Clinical Research Center for Respiratory Disease (2022E50005).
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YKL: Conceptualization, Methodology, Investigation, Validation, Formal analysis, Data curation, Writing—original draft, Writing— review & editing. FJG: Conceptualization, Methodology, Investigation, Validation, Formal analysis, Data curation. XNL: Investigation, Formal analysis, Data curation. CMZ: Conceptualization, Methodology. MJQ: Methodology, Investigation. YHL: Investigation. MMZ: Resources. JJQ: Resources. LJF: Resources. JJL: Resources. BY: Resources, Supervision. QJH: Resources, Supervision. JYZ: Resources, Writing—review & editing, Supervision, Funding acquisition. HZ: Conceptualization, Methodology, Resources, Writing—review & editing, Supervision, Project administration, Funding acquisition. All the authors have read and approved the article.
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Li, Yk., Ge, Fj., Liu, Xn. et al. Ivacaftor, a CFTR potentiator, synergizes with osimertinib against acquired resistance to osimertinib in NSCLC by regulating CFTR-PTEN-AKT axis. Acta Pharmacol Sin 46, 1045–1057 (2025). https://doi.org/10.1038/s41401-024-01427-0
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DOI: https://doi.org/10.1038/s41401-024-01427-0


