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- W2616998933 abstract "Autophagy is a conserved catabolic process to degrade cellular organelles. The role of autophagy in cancer development is complex. Amplification of fibroblast growth factor receptor 1 (FGFR1) is one of the most frequent targets in lung squamous cell carcinoma (SQCC). Whether fibroblast growth factor 2 (FGF2)/FGFR1 contributes to the regulation of autophagy remains elusive.Autophagic activity was evaluated by immunoblotting for microtubule-associated protein 1 light chain 3 (LC3), formation of GFP-LC3 puncta, and monodansylcadaverine (MDC) staining. The effect of autophagy inhibition on cell survival was assessed by cell viability and apoptosis assays.We elucidated that FGFR1 activation suppressed autophagy. Pharmacological or genetic inhibition of FGFR1 by AZD4547 or FGFR1 short hairpin RNA (shRNA) induced autophagy in FGFR1-amplified non-small cell lung cancer (NSCLC) cells, H1581 and H520 cells. Mechanistic study revealed that the induction of autophagy by FGFR1 inhibition was mediated through inhibiting the ERK/MAPK pathway not by AKT pathway, accompanied by upregulation of beclin-1. Furthermore, activation of ERK/MAPK by transfection with a constitutively active MEK1 (caMEK1) construct or knockdown of beclin-1 by RNAi could attenuate autophagy induced by FGFR1 inhibition. Beclin-1 expression was inversely correlated with MEK1 phosphorylation. Inhibition of autophagy by beclin-1 silencing could enhance apoptosis after AZD4547 treatment in H1581 and H520 cells. High levels of LC3B mRNA was a marker of poor prognosis in NSCLC patients.Simultaneously inhibiting FGFR1 and autophagy could enhance cell death which should be further explored in vivo." @default.
- W2616998933 created "2017-06-05" @default.
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- W2616998933 date "2017-05-30" @default.
- W2616998933 modified "2023-10-13" @default.
- W2616998933 title "FGF2/FGFR1 regulates autophagy in FGFR1-amplified non-small cell lung cancer cells" @default.
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- W2616998933 doi "https://doi.org/10.1186/s13046-017-0534-0" @default.
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