Regulation of the Interleukin-6 gene expression during monocytic differentiation of HL-60 cells by chromatin remodeling and methylation. 2014

Magdalena K Poplutz, and Inga Wessels, and Lothar Rink, and Peter Uciechowski
Institute of Immunology, RWTH Aachen University, Medical Faculty, Pauwelsstr. 30, D-52074 Aachen, Germany.

The pro-inflammatory cytokine Interleukin (IL)-6 is involved in the proliferation and differentiation of leukocytes and non-immune cells, but its overproduction is associated with inflammatory and autoimmune disorders. The main producers of IL-6 are mature monocytes, whereas progenitor cells and the promyeloid cell line HL-60 do not synthesize IL-6. In contrast, HL-60 cells differentiated into monocytic cells were able to express IL-6 after lipopolysaccharide (LPS) stimulation. This study investigated the chromatin structure of the IL-6 promoter and the effect of methylation on IL-6 gene regulation during monopoiesis. The results show that the proximal IL-6 promoter regions I to III (+13/-329) were inaccessible in undifferentiated HL-60 cells but became significantly accessible in differentiated HL-60 cells stimulated with LPS. Region IL-6 VI (-1099/-1142) remained closed, but the upstream region IL-6 VII (-2564/-2877) relaxed after differentiation and LPS treatment. The opening of IL-6 IV (-309/-521) and IL-6V (-500/-722), containing DNA and histone methylation sites, was differentiation-dependent only. Demethylation experiments using 5-aza-2'-deoxycytidine (AZA) followed by LPS stimulation revealed a significant enhanced IL-6 mRNA expression and protein release by HL-60 cells. AZA treatment resulted in significant increased IL-6 promoter accessibilities, identifying methylation as an important repressor of IL-6 gene regulation in promyeloid cells. The histone deacetylase (HDAC) inhibitor trichostatin A (TSA) had no effect on IL-6 promoter accessibility. Our data indicate that during monopoiesis the proximal IL-6 promoter is reorganized into an accessible conformation allowing transcription of IL-6 after LPS stimulation. DNA methylation appears to be the essential epigenetic mechanism in IL-6 gene expression of mature monocytes and their progenitors by controlling the chromatin structure.

UI MeSH Term Description Entries
D008070 Lipopolysaccharides Lipid-containing polysaccharides which are endotoxins and important group-specific antigens. They are often derived from the cell wall of gram-negative bacteria and induce immunoglobulin secretion. The lipopolysaccharide molecule consists of three parts: LIPID A, core polysaccharide, and O-specific chains (O ANTIGENS). When derived from Escherichia coli, lipopolysaccharides serve as polyclonal B-cell mitogens commonly used in laboratory immunology. (From Dorland, 28th ed) Lipopolysaccharide,Lipoglycans
D009000 Monocytes Large, phagocytic mononuclear leukocytes produced in the vertebrate BONE MARROW and released into the BLOOD; contain a large, oval or somewhat indented nucleus surrounded by voluminous cytoplasm and numerous organelles. Monocyte
D011401 Promoter Regions, Genetic DNA sequences which are recognized (directly or indirectly) and bound by a DNA-dependent RNA polymerase during the initiation of transcription. Highly conserved sequences within the promoter include the Pribnow box in bacteria and the TATA BOX in eukaryotes. rRNA Promoter,Early Promoters, Genetic,Late Promoters, Genetic,Middle Promoters, Genetic,Promoter Regions,Promoter, Genetic,Promotor Regions,Promotor, Genetic,Pseudopromoter, Genetic,Early Promoter, Genetic,Genetic Late Promoter,Genetic Middle Promoters,Genetic Promoter,Genetic Promoter Region,Genetic Promoter Regions,Genetic Promoters,Genetic Promotor,Genetic Promotors,Genetic Pseudopromoter,Genetic Pseudopromoters,Late Promoter, Genetic,Middle Promoter, Genetic,Promoter Region,Promoter Region, Genetic,Promoter, Genetic Early,Promoter, rRNA,Promoters, Genetic,Promoters, Genetic Middle,Promoters, rRNA,Promotor Region,Promotors, Genetic,Pseudopromoters, Genetic,Region, Genetic Promoter,Region, Promoter,Region, Promotor,Regions, Genetic Promoter,Regions, Promoter,Regions, Promotor,rRNA Promoters
D002454 Cell Differentiation Progressive restriction of the developmental potential and increasing specialization of function that leads to the formation of specialized cells, tissues, and organs. Differentiation, Cell,Cell Differentiations,Differentiations, Cell
D005786 Gene Expression Regulation Any of the processes by which nuclear, cytoplasmic, or intercellular factors influence the differential control (induction or repression) of gene action at the level of transcription or translation. Gene Action Regulation,Regulation of Gene Expression,Expression Regulation, Gene,Regulation, Gene Action,Regulation, Gene Expression
D006801 Humans Members of the species Homo sapiens. Homo sapiens,Man (Taxonomy),Human,Man, Modern,Modern Man
D006877 Hydroxamic Acids A class of weak acids with the general formula R-CONHOH. Hydroxamic Acid,Acid, Hydroxamic,Acids, Hydroxamic
D000077209 Decitabine An azacitidine derivative and antineoplastic antimetabolite. It inhibits DNA methyltransferase to re-activate silent genes, limiting METASTASIS and NEOPLASM DRUG RESISTANCE. Decitabine is used in the treatment of MYELODISPLASTIC SYNDROMES, and ACUTE MYELOID LEUKEMIA. 2'-Deoxy-5-azacytidine,5-Aza-2'-deoxycytidine,5-AzadC,5-Azadeoxycytidine,5-Deoxyazacytidine,5AzadC,AzadC Compound,Dacogen,Decitabine Mesylate,NSC 127716,NSC-127716,2' Deoxy 5 azacytidine,5 Aza 2' deoxycytidine,5 Azadeoxycytidine,5 Deoxyazacytidine,Compound, AzadC,Mesylate, Decitabine,NSC127716
D001374 Azacitidine A pyrimidine analogue that inhibits DNA methyltransferase, impairing DNA methylation. It is also an antimetabolite of cytidine, incorporated primarily into RNA. Azacytidine has been used as an antineoplastic agent. Azacytidine,5-Azacytidine,NSC-102816,Vidaza,5 Azacytidine,NSC 102816,NSC102816
D015254 DNA Modification Methylases Enzymes that are part of the restriction-modification systems. They are responsible for producing a species-characteristic methylation pattern, on either adenine or cytosine residues, in a specific short base sequence in the host cell's own DNA. This methylated sequence will occur many times in the host-cell DNA and remain intact for the lifetime of the cell. Any DNA from another species which gains entry into a living cell and lacks the characteristic methylation pattern will be recognized by the restriction endonucleases of similar specificity and destroyed by cleavage. Most have been studied in bacterial systems, but a few have been found in eukaryotic organisms. DNA Modification Methyltransferases,Modification Methylases,Methylases, DNA Modification,Methylases, Modification,Methyltransferases, DNA Modification,Modification Methylases, DNA,Modification Methyltransferases, DNA

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