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• W4293173694 abstract "The evolutionary properties of organisms lead to the issue of targeted drug resistance. Numerous clinical trials have shown that tumor‑associated macrophages (TAMs) in patients with lung cancer adversely affect the clinical efficacy of epithelial growth factor receptor (EGFR) tyrosine kinase inhibitors (TKIs). However, the mechanism by which TAMs influence the tumor cell response to TKIs remains unclear. The aim of the present study was to investigate the influence of TAM‑derived exosomes on the sensitivity of PC9 and HCC827 lung adenocarcinoma cells to the EGFR inhibitor gefitinib. Multiple cytokines were used to induce the differentiation of THP‑1 human leukemia monocytes into macrophages in vitro. The obtained cells were identified as TAMs by cytomorphology and flow cytometry. Exosomes were extracted from the TAM culture supernatants and identified using electron microscopy and nanoparticle tracking analysis. Flow cytometry was used to examine the apoptosis of lung adenocarcinoma cells when treated with gefitinib and/or TAM‑derived exosomes. In addition, western blotting was used to detect the expression of the key proteins of the AKT, ERK1/2 and STAT3 signaling pathways. TAM‑derived exosomes were successfully obtained. The TAM‑derived exosomes were shown to affect the proliferation and apoptosis of lung adenocarcinoma cells. Furthermore, the killing effect of gefitinib on the tumor cells was attenuated. The mechanism underlying the effects of the TAM‑derived exosomes may be associated with reactivation of the AKT, ERK1/2 and STAT3 signaling pathways. In conclusion, the findings indicate that TAM‑derived exosomes promote resistance to gefitinib in non‑small cell lung cancer (NSCLC), and the mechanism may be associated with reactivation of the AKT, ERK1/2 and STAT3 signaling pathways. This study may serve as a reference in the exploration of alternative strategies for NSCLC following the development of resistance to EGFR‑targeted drugs." @default.
• W4293173694 created "2022-08-27" @default.
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• W4293173694 date "2022-08-24" @default.
• W4293173694 modified "2023-10-06" @default.
• W4293173694 title "Tumor‑associated macrophage‑derived exosomes promote EGFR‑TKI resistance in non‑small cell lung cancer by regulating the AKT, ERK1/2 and STAT3 signaling pathways" @default.
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• W4293173694 doi "https://doi.org/10.3892/ol.2022.13476" @default.
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