Targeting RRM2 with dual-modal theranostic smart nanoresponder overcomes osimertinib resistance and triggers immune remodeling in NSCLC
Menée à l'aide de lignées cellulaires, de modèles murins ainsi que d'échantillons tumoraux et d'échantillons tissulaires adjacents provenant de patients atteints d'un cancer du poumon non à petites cellules, cette étude met en évidence l'intérêt thérapeutique de nanovésicules chargées en osimertinib, sensibles au pH et permettant, grâce à l'iode124 et le fluorophore Cy5.5 qu'elles comportent, le suivi en temps réel du ciblage de la tumeur et de la biodistribution du médicament au moyen d'examens d'imagerie
Osimertinib (Osi) resistance limits its efficacy in EGFR-mutant non–small cell lung cancer (NSCLC). Here, we developed a pH-responsive cationic nanovesicle (124I/Cy5.5-sO@FCLs), equipped with dual-modal positron emission tomography (PET) and fluorescence imaging capabilities, to enable dynamic monitoring of the role of ribonucleotide reductase M2 subunit (RRM2) disruption in overcoming Osi resistance and enhance targeted anticancer efficacy in NSCLC. RRM2 was identified as a critical driver of poor prognosis and Osi resistance in NSCLC. The 124I/Cy5.5-sO@FCLs enabled real-time tracking of tumor targeting and biodistribution, and CRISPR-Cas9–mediated RRM2 disruption efficiently reversed Osi resistance and potentiated synergistic anticancer effects, which was attributed to counteracting TGF-β/Smad2/3–mediated epithelial-mesenchymal transition (EMT) and amplifying cGAS/STING-induced ferroptosis. Furthermore, the nanovesicles triggered STING-dependent immunogenic cell death (ICD), stimulating tumor infiltration of dendritic cells (DCs) and T cells; combination with anti–PD-L1 therapy augmented NSCLC regression. Collectively, 124I/Cy5.5-sO@FCLs integrate gene editing with targeted therapies while enabling dynamic, quantitative monitoring, providing an approach for precision-targeted treatment in Osi-resistant NSCLC. A nanoresponder was developted to integrate precise treatment and real-time monitoring and eliminate Osi resistance in NSCLC.
Science Advances , article en libre accès, 2025