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• W4386213256 abstract "Abstract Pyridinyl imidazole class p38 MAPKα/β (MAPK14/MAPK11) inhibitors including SB202190 have been shown to induce a cell-type specific defective autophagy response resulting in micron-scale vacuole formation and autophagy-dependent death. We had earlier shown that this is an off-target effect of SB202190. Here we provide evidence that the cell-type specific vacuole formation is independent of canonical autophagy pathway. While SB202190 seems to interfere with autophagic flux in many cell lines parallel to vacuolation, autophagy-deficient DU-145 cells and CRISPR/Cas9 gene-edited ATG5 knockout A549 cells also undergo vacuolation upon SB202190 treatment. Further analyses identified the late-endosomal GTPase RAB7 as a marker for the SB202190-induced micron-scale vacuoles. A screen for modulators of SB202190-induced vacuolation revealed molecules including multi-kinase inhibitor Sorafenib as inhibitor of vacuolation. Moreover VE-821, an ATR kinase inhibitor was found to phenocopy the cell-type specific vacuolation response of SB202190. To identify the factors determining the cell-type specificity of the vacuolation response induced by SB-compounds and VE-821, we compared the transcriptomics data from vacuole forming and non-vacuole forming cancer cell lines and identified a gene expression signature which may define sensitivity of cancer cells to these small-molecule kinase inhibitors. Further analyses using the small molecule tools and the gene signature discovered here, could reveal novel mechanisms regulating this interesting phenotype relevant to anti-cancer therapy." @default.
• W4386213256 created "2023-08-29" @default.
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• W4386213256 date "2023-08-28" @default.
• W4386213256 modified "2023-09-27" @default.
• W4386213256 title "Kinase inhibitor-induced cell-type specific vacuole formation in the absence of canonical ATG5-dependent autophagy" @default.
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• W4386213256 doi "https://doi.org/10.1101/2023.08.27.554994" @default.
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