title: Regulation of glutathione S-transferase P1-1 gene expression by NF-kappaB in tumor necrosis factor alpha-treated K562 leukemia cells.
abstract: Glutathione S-transferases (GSTs) play an important role in the protection of cells against xenobiotics and lipid hydroperoxides generated by oxidative stress. In human, the GSTP1-1 expression is commonly increased in many tumors and involved in the development of antineoplastic drug resistance. Reactive oxygen species are released at inflammation sites and oxidative stress conditions enhance the expression of genes encoding antioxidant enzymes such as GSTs. Here we investigated the regulation of the GSTP1-1 gene expression in the K562 cell line by nuclear factor kappaB (NF-kappaB) and the pro-inflammatory cytokine tumor necrosis factor alpha (TNFalpha). By studying GSTP1-1 mRNA expression and NF-kappaB/GSTP1-1 promoter interactions, we showed the implication of NF-kappaB in the GSTP1-1 gene expression and we described a new specific TNFalpha-inducible NF-kappaB binding site upstream of the minimal promoter. Moreover, TNFalpha treatment as well as cotransfection of NF-kappaB signaling pathway intermediates induced an activation of the GSTP1-1 gene promoter in K562 cells. Site-directed mutagenesis of the NF-kappaB site strongly inhibited TNFalpha- and NF-kappaBp65-induced promoter activation. Altogether, we showed that a sequence located at -323/-314 within the GSTP1-1 promoter bound NF-kappaB p50/65 and p65/p65 dimers and that this kappaB site was involved in the regulation of the gene by TNFalpha.
authors.affiliation: Laboratoire de Recherche sur le Cancer et les Maladies du Sang, Centre Universitaire de Luxembourg, 162A Avenue de la Faïencerie, Luxembourg L-1511, Luxembourg.
authors.forename: Franck
authors.initials: F
authors.lastname: Morceau
authors.forename: Annelyse
authors.initials: A
authors.lastname: Duvoix
authors.forename: Sylvie
authors.initials: S
authors.lastname: Delhalle
authors.forename: Michaël
authors.initials: M
authors.lastname: Schnekenburger
authors.forename: Mario
authors.initials: M
authors.lastname: Dicato
authors.forename: Marc
authors.initials: M
authors.lastname: Diederich
mesh_terms: D001665:Binding Sites; D015972:Gene Expression Regulation, Neoplastic / Q000187:drug effects*; D051549:Glutathione S-Transferase pi; D005982:Glutathione Transferase / Q000235:genetics / Q000378:metabolism*; D006801:Humans; D007527:Isoenzymes / Q000235:genetics / Q000378:metabolism*; D007938:Leukemia; D016328:NF-kappa B / Q000502:physiology*; D009570:Nitriles; D009930:Organic Chemicals / Q000494:pharmacology; D011401:Promoter Regions, Genetic / Q000187:drug effects; D015398:Signal Transduction / Q000187:drug effects / Q000502:physiology; D013450:Sulfones; D014407:Tumor Cells, Cultured; D014409:Tumor Necrosis Factor-alpha / Q000494:pharmacology*
chemical_list: C434003:3-(4-methylphenylsulfonyl)-2-propenenitrile; D007527:Isoenzymes; D016328:NF-kappa B; D009570:Nitriles; D009930:Organic Chemicals; D013450:Sulfones; D014409:Tumor Necrosis Factor-alpha; C496556:GSTP1 protein, human; D051549:Glutathione S-Transferase pi; D005982:Glutathione Transferase