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• W4307457805 abstract "Background Lung squamous cell carcinoma (LUSC) currently has limited therapeutic options because of the relatively few validated targets and the lack of clinical drugs for some of these targets. Although NRF2/NFE2L2 pathway activation commonly occurs in LUSC, NRF2 has predominantly been studied in other cancer models. Here, we investigated the function of NRF2 in LUSC, including in organoid models, and we explored the activity of a small molecule NRF2 inhibitor ML385, which has not previously been investigated in LUSC. Methods We first explored the role of NRF2 signaling in LUSC cancer cell line and organoid proliferation through NRF2 knockdown or ML385 treatment, both in vivo and in vitro. Next, we performed Western blot and immunofluorescence assays to determine the effect of NRF2 inhibition on PI3K-mTOR signaling. Finally, we used cell viability and clonogenic assays to explore whether ML385 could sensitize LUSC cancer cells to PI3K inhibitors. Results We find that downregulation of NRF2 signaling inhibited proliferation of LUSC cancer cell lines and organoids, both in vivo and in vitro. We also demonstrate that inhibition of NRF2 reduces PI3K-mTOR signaling, with two potential mechanisms being involved. Although NRF2 promotes AKT phosphorylation, it also acts downstream of AKT to increase RagD protein expression and recruitment of mTOR to lysosomes after amino acid stimulation. We also find that ML385 potentiates LUSC growth inhibition by a pan-PI3K inhibitor, which correlates with stronger inhibition of PI3K-mTOR signaling. Conclusions Our data provide additional support for NRF2 promoting LUSC growth through PI3K-mTOR activation and support development of NRF2 inhibitors for the treatment of LUSC." @default.
• W4307457805 created "2022-11-01" @default.
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• W4307457805 date "2022-10-28" @default.
• W4307457805 modified "2023-10-17" @default.
• W4307457805 title "The <scp>NRF2</scp> antagonist <scp>ML385</scp> inhibits <scp>PI3K‐mTOR</scp> signaling and growth of lung squamous cell carcinoma cells" @default.
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• W4307457805 doi "https://doi.org/10.1002/cam4.5311" @default.
• W4307457805 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36305267" @default.
• W4307457805 hasPublicationYear "2022" @default.
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