title: Novel hematopoietic target genes in the NRF2-mediated transcriptional pathway.
abstract: Nuclear factor- (erythroid-derived 2) like 2 (NFE2L2, NRF2) is a key transcriptional activator of the antioxidant response pathway and is closely related to erythroid transcription factor NFE2. Under oxidative stress, NRF2 heterodimerizes with small Maf proteins and binds cis-acting enhancer sequences found near oxidative stress response genes. Using the dietary isothiocyanate sulforaphane (SFN) to activate NRF2, chromatin immunoprecipitation sequencing (ChIP-seq) identified several hundred novel NRF2-mediated targets beyond its role in oxidative stress. Activated NRF2 bound the antioxidant response element (ARE) in promoters of several known and novel target genes involved in iron homeostasis and heme metabolism, including known targets FTL and FTH1, as well as novel binding in the globin locus control region. Five novel NRF2 target genes were chosen for followup: AMBP, ABCB6, FECH, HRG-1 (SLC48A1), and TBXAS1. SFN-induced gene expression in erythroid K562 and lymphoid cells were compared for each target gene. NRF2 silencing showed reduced expression in lymphoid, lung, and hepatic cells. Furthermore, stable knockdown of NRF2 negative regulator KEAP1 in K562 cells resulted in increased NQO1, AMBP, and TBXAS1 expression. NFE2 binding sites in K562 cells revealed similar binding profiles as lymphoid NRF2 sites in all potential NRF2 candidates supporting a role for NRF2 in heme metabolism and erythropoiesis.
authors.affiliation: Environmental Genomics Section, Laboratory of Molecular Genetics, National Institute of Environmental Health Sciences-National Institutes of Health, Research Triangle Park, NC 27709, USA.
authors.forename: Michelle R
authors.initials: MR
authors.lastname: Campbell
authors.forename: Mehmet
authors.initials: M
authors.lastname: Karaca
authors.forename: Kelly N
authors.initials: KN
authors.lastname: Adamski
authors.forename: Brian N
authors.initials: BN
authors.lastname: Chorley
authors.forename: Xuting
authors.initials: X
authors.lastname: Wang
authors.forename: Douglas A
authors.initials: DA
authors.lastname: Bell
mesh_terms: D002460:Cell Line; D047369:Chromatin Immunoprecipitation; D041905:Erythroid Cells / Q000187:drug effects / Q000378:metabolism; D005786:Gene Expression Regulation / Q000187:drug effects; D020868:Gene Silencing / Q000187:drug effects; D005796:Genes; D056726:Genetic Association Studies; D056426:Genetic Loci; D005914:Globins / Q000235:genetics; D006410:Hematopoiesis / Q000187:drug effects / Q000235:genetics*; D006801:Humans; D017879:Isothiocyanates / Q000494:pharmacology; D016660:NAD(P)H Dehydrogenase (Quinone) / Q000235:genetics / Q000378:metabolism; D050984:NF-E2 Transcription Factor, p45 Subunit / Q000235:genetics / Q000378:metabolism; D051267:NF-E2-Related Factor 2 / Q000378:metabolism*; D011485:Protein Binding / Q000187:drug effects / Q000235:genetics; D015203:Reproducibility of Results; D013454:Sulfoxides; D014158:Transcription, Genetic / Q000187:drug effects
chemical_list: D017879:Isothiocyanates; D050984:NF-E2 Transcription Factor, p45 Subunit; D051267:NF-E2-Related Factor 2; C494692:NFE2 protein, human; D013454:Sulfoxides; D005914:Globins; D016660:NAD(P)H Dehydrogenase (Quinone); C447479:NQO1 protein, human; C016766:sulforaphane