title: The transcriptional repressor Gfi1 controls STAT3-dependent dendritic cell development and function.
abstract: The mechanisms controlling the differentiation of dendritic cells (DCs) remain largely unknown. Using a transcriptional profiling approach, we identified Gfi1 as a novel critical transcription factor in DC differentiation. Gfi1-/- mice showed a global reduction of myeloid and lymphoid DCs in all lymphoid organs whereas epidermal Langerhans cells were enhanced in number. In vivo, Gfi1-/- DCs showed striking phenotypic and functional alterations such as defective maturation and increased cytokine production. In vitro, Gfi1-/- hematopoietic progenitor cells were unable to develop into DCs. Instead, they differentiated into macrophages, suggesting that Gfi1 is a critical modulator of DC versus macrophage development. Analysis of hematopoietic chimeras and retrovirus-reconstituted hematopoietic progenitor cells established a cell autonomous and nonredundant role for Gfi1 in DC development. The developmental defect of Gfi1-/- progenitor cells was associated with decreased STAT3 activation. In conclusion, we have identified Gfi1 as a critical transcription factor that controls DC versus macrophage development and dissociates DC maturation and activation.
authors.affiliation: Department of Pediatric Hematology/Oncology, Hannover Medical School, Carl Neuberg Strasse 1, 30625 Hannover, Germany.
authors.forename: Chozhavendan
authors.initials: C
authors.lastname: Rathinam
authors.forename: Robert
authors.initials: R
authors.lastname: Geffers
authors.forename: Raif
authors.initials: R
authors.lastname: Yücel
authors.forename: Jan
authors.initials: J
authors.lastname: Buer
authors.forename: Karl
authors.initials: K
authors.lastname: Welte
authors.forename: Tarik
authors.initials: T
authors.lastname: Möröy
authors.forename: Christoph
authors.initials: C
authors.lastname: Klein
mesh_terms: D000818:Animals; D002454:Cell Differentiation / Q000276:immunology*; D004268:DNA-Binding Proteins / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D003713:Dendritic Cells / Q000166:cytology* / Q000276:immunology; D020869:Gene Expression Profiling; D006412:Hematopoietic Stem Cells / Q000166:cytology / Q000276:immunology; D008264:Macrophages / Q000166:cytology / Q000276:immunology; D051379:Mice; D050796:STAT3 Transcription Factor; D015534:Trans-Activators / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D014157:Transcription Factors / Q000235:genetics / Q000276:immunology / Q000378:metabolism*; D014158:Transcription, Genetic
chemical_list: D004268:DNA-Binding Proteins; C079873:Gfi1 protein, mouse; D050796:STAT3 Transcription Factor; C494087:Stat3 protein, mouse; D015534:Trans-Activators; D014157:Transcription Factors