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• W2022670325 endingPage "1921" @default.
• W2022670325 startingPage "1910" @default.
• W2022670325 abstract "The cycle inhibiting factor (Cif) belongs to a family of bacterial toxins and effector proteins, the cyclomodulins, that deregulate the host cell cycle. Upon injection into HeLa cells by the enteropathogenic Escherichia coli (EPEC) type III secretion system, Cif induces a cytopathic effect characterized by the recruitment of focal adhesion plates and the formation of stress fibres, an irreversible cell cycle arrest at the G(2)/M transition, and sustained inhibitory phosphorylation of mitosis inducer, CDK1. Here, we report that the reference typical EPEC strain B171 produces a functional Cif and that lipid-mediated delivery of purified Cif into HeLa cells induces cell cycle arrest and actin stress fibres, implying that Cif is necessary and sufficient for these effects. EPEC infection of intestinal epithelial cells (Caco-2, IEC-6) also induces cell cycle arrest and CDK1 inhibition. The effect of Cif is strikingly similar to that of cytolethal distending toxin (CDT), which inhibits the G(2)/M transition by activating the DNA-damage checkpoint pathway. However, in contrast to CDT, Cif does not cause phosphorylation of histone H2AX, which is associated with DNA double-stranded breaks. Following EPEC infection, the checkpoint effectors ATM/ATR, Chk1 and Chk2 are not activated, the levels of the CDK-activating phosphatases Cdc25B and Cdc25C are not affected, and Cdc25C is not sequestered in host cell cytoplasm. Hence, Cif activates a DNA damage-independent signalling pathway that leads to inhibition of the G(2)/M transition." @default.
• W2022670325 created "2016-06-24" @default.
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• W2022670325 date "2006-12-01" @default.
• W2022670325 modified "2023-10-17" @default.
• W2022670325 title "Escherichia coli cyclomodulin Cif induces G₂arrest of the host cell cycle without activation of the DNA-damage checkpoint-signalling pathway" @default.
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• W2022670325 doi "https://doi.org/10.1111/j.1462-5822.2006.00757.x" @default.
• W2022670325 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/16848790" @default.
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