title: Deacetylase activity is required for STAT5-dependent GM-CSF functional activity in macrophages and differentiation to dendritic cells.
abstract: After interaction with its receptor, GM-CSF induces phosphorylation of the beta-chain in two distinct domains in macrophages. One induces activation of mitogen-activated protein kinases and the PI3K/Akt pathway, and the other induces JAK2-STAT5. In this study we describe how trichostatin A (TSA), which inhibits deacetylase activity, blocks JAK2-STAT5-dependent gene expression but not the expression of genes that depend on the signal transduction induced by the other domain of the receptor. TSA treatment inhibited the GM-CSF-dependent proliferation of macrophages by interfering with c-myc and cyclin D1 expression. However, M-CSF-dependent proliferation, which requires ERK1/2, was unaffected. Protection from apoptosis, which involves Akt phosphorylation and p21(waf-1) expression, was not modified by TSA. GM-CSF-dependent expression of MHC class II molecules was inhibited because CIITA was not induced. The generation of dendritic cells was also impaired by TSA treatment because of the inhibition of IRF4, IRF2, and RelB expression. TSA mediates its effects by preventing the recruitment of RNA polymerase II to the promoter of STAT5 target genes and by inhibiting their expression. However, this drug did not affect STAT5A or STAT5B phosphorylation or DNA binding. These results in GM-CSF-treated macrophages reveal a relationship between histone deacetylase complexes and STAT5 in the regulation of gene expression.
authors.affiliation: Institute for Research in Biomedicine and University of Barcelona, Barcelona Science Park, Josep Samitier 105, Barcelona, Spain.
authors.forename: Carlos
authors.initials: C
authors.lastname: Sebastián
authors.forename: Maria
authors.initials: M
authors.lastname: Serra
authors.forename: Andrée
authors.initials: A
authors.lastname: Yeramian
authors.forename: Neus
authors.initials: N
authors.lastname: Serrat
authors.forename: Jorge
authors.initials: J
authors.lastname: Lloberas
authors.forename: Antonio
authors.initials: A
authors.lastname: Celada
mesh_terms: D000818:Animals; D017209:Apoptosis / Q000187:drug effects / Q000276:immunology; D002454:Cell Differentiation / Q000187:drug effects / Q000276:immunology*; D049109:Cell Proliferation / Q000187:drug effects; D056741:Cyclin D; D050759:Cyclin-Dependent Kinase Inhibitor p21 / Q000276:immunology / Q000378:metabolism; D016213:Cyclins / Q000276:immunology / Q000378:metabolism; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D005786:Gene Expression Regulation / Q000187:drug effects / Q000276:immunology*; D016178:Granulocyte-Macrophage Colony-Stimulating Factor / Q000276:immunology* / Q000378:metabolism; D000949:Histocompatibility Antigens Class II / Q000276:immunology / Q000378:metabolism; D056572:Histone Deacetylase Inhibitors; D006655:Histone Deacetylases / Q000276:immunology* / Q000378:metabolism; D006877:Hydroxamic Acids / Q000494:pharmacology; D050836:Interferon Regulatory Factor-2 / Q000276:immunology / Q000378:metabolism; D050835:Interferon Regulatory Factors / Q000276:immunology / Q000378:metabolism; D053614:Janus Kinase 2 / Q000235:genetics / Q000276:immunology; D008264:Macrophages / Q000166:cytology / Q000276:immunology* / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D019950:Mitogen-Activated Protein Kinase 1 / Q000276:immunology / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000276:immunology / Q000378:metabolism; D009687:Nuclear Proteins / Q000276:immunology / Q000378:metabolism; D019869:Phosphatidylinositol 3-Kinases / Q000276:immunology / Q000378:metabolism; D010766:Phosphorylation / Q000187:drug effects; D011401:Promoter Regions, Genetic / Q000276:immunology; D051057:Proto-Oncogene Proteins c-akt / Q000276:immunology / Q000378:metabolism; D016271:Proto-Oncogene Proteins c-myc / Q000276:immunology / Q000378:metabolism; D012319:RNA Polymerase II / Q000276:immunology / Q000378:metabolism; D016187:Receptors, Granulocyte-Macrophage Colony-Stimulating Factor / Q000276:immunology / Q000378:metabolism; D050799:STAT5 Transcription Factor / Q000276:immunology* / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects / Q000276:immunology; D015534:Trans-Activators / Q000276:immunology / Q000378:metabolism; D051841:Transcription Factor RelB / Q000276:immunology / Q000378:metabolism; D000099218:Interferon Regulatory Factor-4
chemical_list: D056741:Cyclin D; D050759:Cyclin-Dependent Kinase Inhibitor p21; D016213:Cyclins; D004791:Enzyme Inhibitors; D016178:Granulocyte-Macrophage Colony-Stimulating Factor; D000949:Histocompatibility Antigens Class II; D056572:Histone Deacetylase Inhibitors; D006655:Histone Deacetylases; D006877:Hydroxamic Acids; D050836:Interferon Regulatory Factor-2; D050835:Interferon Regulatory Factors; D053614:Janus Kinase 2; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D009687:Nuclear Proteins; D019869:Phosphatidylinositol 3-Kinases; D051057:Proto-Oncogene Proteins c-akt; D016271:Proto-Oncogene Proteins c-myc; D012319:RNA Polymerase II; D016187:Receptors, Granulocyte-Macrophage Colony-Stimulating Factor; D050799:STAT5 Transcription Factor; D015534:Trans-Activators; D051841:Transcription Factor RelB; D000099218:Interferon Regulatory Factor-4; C493957:Cdkn1a protein, mouse; C494230:Irf2 protein, mouse; C083728:MHC class II transactivator protein; C489428:Myc protein, mouse; C497594:Relb protein, mouse; C494093:Stat5a protein, mouse; C494096:Stat5b protein, mouse; C012589:trichostatin A; C507926:Jak2 protein, mouse