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• W2158906957 abstract "Epithionitriles represent a previously unrecognized class of cancer chemopreventive phytochemical generated from alkenyl glucosinolates in cruciferous vegetables. In rat liver RL-34 epithelial cells, 1-cyano-2,3-epithiopropane (CETP), 1-cyano-3,4-epithiobutane (CETB) and 1-cyano-4,5-epithiopentane (CETPent) were shown to induce cytoprotective enzymes including NAD(P)H:quinone oxidoreductase 1 (NQO1), glutathione (GSH) S -transferase A3 and the glutamate–cysteine ligase modifier subunit; CETP was more potent in this regard than were either CETB or CETPent, with 50 μM CETP eliciting a remarkable ∼10-fold induction of NQO1. Furthermore, 50 μM CETP stimulated a 2.0-fold overproduction of GSH in RL-34 cells. Transfection experiments demonstrated that epithionitriles induced gene expression through an antioxidant response element (ARE) and that transactivation of an Nqo1-luciferase reporter plasmid was dependent on NF-E2 p45-related factor 2 (Nrf2), a cap'n'collar basic region leucine zipper transcription factor. Evidence is presented that CETP affected Nrf2-mediated induction of ARE-driven transcription by inhibiting Kelch-like ECH-associated protein 1 (Keap1), a ubiquitin ligase substrate adaptor that negatively regulates Nrf2. We found that Nqo1 was expressed constitutively at high levels in Keap1 −/− mouse embryonic fibroblasts (MEFs) and it was not further induced by CETP. However, knock-in of mouse Keap1 or zebrafish Keap1a into Keap1 −/− MEFs repressed Nqo1-luciferase reporter gene activity, but repression by the murine or zebrafish proteins was antagonized by CETP. Pre-treatment of Nrf2 +/+ MEFs, but not Nrf2 −/− MEFs, with 15 μM CETP for 24 h conferred 2.4-fold resistance against subsequent exposure to the α,β-unsaturated aldehyde acrolein, indicating that the phytochemical exerts chemopreventive properties against genotoxic xenobiotics." @default.
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• W2158906957 date "2009-07-24" @default.
• W2158906957 modified "2023-10-09" @default.
• W2158906957 title "1-Cyano-2,3-epithiopropane is a novel plant-derived chemopreventive agent which induces cytoprotective genes that afford resistance against the genotoxic , -unsaturated aldehyde acrolein" @default.
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• W2158906957 doi "https://doi.org/10.1093/carcin/bgp182" @default.
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