title: High Glucose Increases the Expression of Inflammatory Cytokine Genes in Macrophages Through H3K9 Methyltransferase Mechanism.
abstract: Recent studies suggest that histone modification is one of the mechanisms regulating inflammatory cytokine gene expression in hyperglycemic conditions. However, it remains unknown how histone methylation is initiated and involved in changes of inflammatory cytokine gene expression under high glucose (HG) conditions. Our aim was to investigate whether H3K9 methylation was involved in HG-induced expression of inflammatory cytokines in macrophages. Expression profile of cytokine genes under hyperglycemia in THP-1-derived macrophages was determined by human cytokine antibody array. Based on the results from the human cytokine antibody array analyses, the H3K9me3 levels of 4 inflammatory cytokine genes, including interleukin-6 (IL-6), IL-12p40, macrophage inflammatory protein-1α (MIP-1α), and MIP-1β under HG were determined by ChIP assays. Furthermore, the expression of these 4 inflammatory cytokine genes under either HG or chaetocin (an inhibitor of SUV39H1 methyltransferase) exposure or overexpression of SUV39H1 (a H3K9me3-specific methyltransferase) was analyzed by quantitative polymerase chain reaction. Macrophages cultured in HG conditions showed increased gene expression and decreased H3K9me3 levels of inflammatory cytokine genes compared with macrophages incubated in normal glucose (NG) culture. Inhibition of SUV39H1 with chaetocin in NG-treated macrophages also increased the expression of IL-6, IL-12p40, MIP-1α, and MIP-1β. Furthermore, inhibition of SUV39H1 with chaetocin in HG-treated macrophages further increased the expression of these inflammatory cytokines. Contrarily, NG-treated macrophages transfected with SUV39H1 plasmids show decreased expression of inflammatory cytokines. Furthermore, overexpression of SUV39H1 in HG-treated macrophages alleviated the expression of inflammatory cytokines under HG conditions. Finally, HG also increases the expression of inflammation cytokines in mouse bone marrow-derived macrophages. Our data demonstrated that HG increases the expression of inflammatory cytokines in macrophages through decreased H3K9me3 levels, which was partly mediated by SUV39H1. Dysregulation of epigenetic histone modification may be one of the underlying mechanisms for HG-induced inflammatory cytokine expression in macrophages.
authors.affiliation: Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People's Hospital , Shanghai Diabetes Institute, Shanghai Clinical Center for Diabetes, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Key Clinical Center for Metabolic Diseases, Shanghai, China .
authors.forename: Mei-Fang
authors.initials: MF
authors.lastname: Li
authors.affiliation: Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People's Hospital , Shanghai Diabetes Institute, Shanghai Clinical Center for Diabetes, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Key Clinical Center for Metabolic Diseases, Shanghai, China .
authors.forename: Rong
authors.initials: R
authors.lastname: Zhang
authors.affiliation: Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People's Hospital , Shanghai Diabetes Institute, Shanghai Clinical Center for Diabetes, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Key Clinical Center for Metabolic Diseases, Shanghai, China .
authors.forename: Ting-Ting
authors.initials: TT
authors.lastname: Li
authors.affiliation: Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People's Hospital , Shanghai Diabetes Institute, Shanghai Clinical Center for Diabetes, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Key Clinical Center for Metabolic Diseases, Shanghai, China .
authors.forename: Ming-Yun
authors.initials: MY
authors.lastname: Chen
authors.affiliation: Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People's Hospital , Shanghai Diabetes Institute, Shanghai Clinical Center for Diabetes, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Key Clinical Center for Metabolic Diseases, Shanghai, China .
authors.forename: Lian-Xi
authors.initials: LX
authors.lastname: Li
authors.affiliation: Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People's Hospital , Shanghai Diabetes Institute, Shanghai Clinical Center for Diabetes, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Key Clinical Center for Metabolic Diseases, Shanghai, China .
authors.forename: Jun-Xi
authors.initials: JX
authors.lastname: Lu
authors.affiliation: Department of Endocrinology and Metabolism, Shanghai Jiao Tong University Affiliated Sixth People's Hospital , Shanghai Diabetes Institute, Shanghai Clinical Center for Diabetes, Shanghai Key Laboratory of Diabetes Mellitus, Shanghai Key Clinical Center for Metabolic Diseases, Shanghai, China .
authors.forename: Wei-Ping
authors.initials: WP
authors.lastname: Jia
mesh_terms: D000818:Animals; D002460:Cell Line; D054405:Chemokine CCL3 / Q000819:agonists / Q000235:genetics* / Q000276:immunology; D054407:Chemokine CCL4 / Q000819:agonists / Q000235:genetics* / Q000276:immunology; D004791:Enzyme Inhibitors / Q000494:pharmacology; D044127:Epigenesis, Genetic; D020869:Gene Expression Profiling; D005947:Glucose / Q000494:pharmacology*; D000076983:Histone Methyltransferases; D011495:Histone-Lysine N-Methyltransferase / Q000037:antagonists & inhibitors / Q000235:genetics* / Q000276:immunology; D006657:Histones / Q000235:genetics / Q000276:immunology; D006801:Humans; D053762:Interleukin-12 Subunit p40 / Q000819:agonists / Q000235:genetics* / Q000276:immunology; D015850:Interleukin-6 / Q000819:agonists / Q000235:genetics* / Q000276:immunology; D008264:Macrophages / Q000166:cytology / Q000187:drug effects* / Q000276:immunology; D008297:Male; D008745:Methylation; D051379:Mice; D008810:Mice, Inbred C57BL; D010879:Piperazines / Q000494:pharmacology; D061251:Primary Cell Culture; D011401:Promoter Regions, Genetic; D040081:Protein Array Analysis; D015398:Signal Transduction
chemical_list: D054405:Chemokine CCL3; D054407:Chemokine CCL4; D004791:Enzyme Inhibitors; D006657:Histones; D053762:Interleukin-12 Subunit p40; D015850:Interleukin-6; D010879:Piperazines; C002511:chaetocin; D000076983:Histone Methyltransferases; D011495:Histone-Lysine N-Methyltransferase; D005947:Glucose