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• W4310962695 endingPage "734" @default.
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• W4310962695 abstract "Abstract Induction of cell death represents a primary goal of most anticancer treatments. Despite the efficacy of such approaches, a small population of “persisters” develop evasion strategies to therapy-induced cell death. While previous studies have identified mechanisms of resistance to apoptosis, the mechanisms by which persisters dampen other forms of cell death, such as pyroptosis, remain to be elucidated. Pyroptosis is a form of inflammatory cell death that involves formation of membrane pores, ion gradient imbalance, water inflow, and membrane rupture. Herein, we investigate mechanisms by which cancer persisters resist pyroptosis, survive, then proliferate in the presence of tyrosine kinase inhibitors (TKI). Lung, prostate, and esophageal cancer persister cells remaining after treatments exhibited several hallmarks indicative of pyroptosis resistance. The inflammatory attributes of persisters included chronic activation of inflammasome, STING, and type I interferons. Comprehensive metabolomic characterization uncovered that TKI-induced pyroptotic persisters display high methionine consumption and excessive taurine production. Elevated methionine flux or exogenous taurine preserved plasma membrane integrity via osmolyte-mediated effects. Increased dependency on methionine flux decreased the level of one carbon metabolism intermediate S-(5′-adenosyl)-L-homocysteine, a determinant of cell methylation capacity. The consequent increase in methylation potential induced DNA hypermethylation of genes regulating metal ion balance and intrinsic immune response. This enabled thwarting TKI resistance by using the hypomethylating agent decitabine. In summary, the evolution of resistance to pyroptosis can occur via a stepwise process of physical acclimation and epigenetic changes without existing or recurrent mutations. Significance: Methionine enables cancer cells to persist by evading pyroptotic osmotic lysis, which leads to genome-wide hypermethylation that allows persisters to gain proliferative advantages." @default.
• W4310962695 created "2022-12-21" @default.
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• W4310962695 date "2022-12-08" @default.
• W4310962695 modified "2023-10-16" @default.
• W4310962695 title "Elevated Methionine Flux Drives Pyroptosis Evasion in Persister Cancer Cells" @default.
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• W4310962695 doi "https://doi.org/10.1158/0008-5472.can-22-1002" @default.
• W4310962695 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/36480167" @default.
• W4310962695 hasPublicationYear "2022" @default.
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