title: GATA-2 and GATA-2/ER display opposing activities in the development and differentiation of blood progenitors.
abstract: GATA-2 is a zinc finger transcription factor essential for the development of hematopoiesis. While GATA-2 is generally considered to play an important role in the biology of hematopoietic stem and progenitor cells, its function within these compartments is not well understood. Here we have employed both conditional expression of GATA-2 and conditional activation of a GATA-2/estrogen receptor (ER) chimera to examine the effect of enforced GATA-2 expression in the development and differentiation of hematopoietic progenitors from murine embryonic stem cells. Consistent with the phenotype of GATA-2 null animals, conditional expression of GATA-2 from a tetracycline-inducible promoter enhanced the production of hematopoietic progenitors. Conditional activation of a GATA-2/ER chimera produced essentially opposite effects to those observed with conditional GATA-2 expression. GATA-2 and GATA-2/ER differ in their binding activities and transcriptional interactions from other hematopoietic-associated transcription factors such as c-Myb and PU.1. While we have exploited these differences in activity to explore the transcriptional networks underlying hematopoietic cell fate determination, our results suggest that care should be taken in interpreting results obtained using only chimeric proteins.
authors.affiliation: Department of Molecular Cell Biology, Research Institute for Microbial Diseases, Osaka University, Suita 565-0871, Japan.
authors.forename: Kenji
authors.initials: K
authors.lastname: Kitajima
authors.forename: Masaaki
authors.initials: M
authors.lastname: Masuhara
authors.forename: Takumi
authors.initials: T
authors.lastname: Era
authors.forename: Tariq
authors.initials: T
authors.lastname: Enver
authors.forename: Toru
authors.initials: T
authors.lastname: Nakano
mesh_terms: D000818:Animals; D015415:Biomarkers; D002454:Cell Differentiation / Q000502:physiology; D002460:Cell Line; D004268:DNA-Binding Proteins / Q000235:genetics / Q000378:metabolism*; D004921:Erythropoietin / Q000494:pharmacology; D004958:Estradiol / Q000494:pharmacology; D050989:GATA2 Transcription Factor; D018507:Gene Expression Regulation, Developmental; D017930:Genes, Reporter; D006412:Hematopoietic Stem Cells / Q000187:drug effects / Q000502:physiology*; D006801:Humans; D051379:Mice; D008822:Mice, Transgenic; D010641:Phenotype; D011500:Protein Synthesis Inhibitors / Q000494:pharmacology; D011960:Receptors, Estrogen / Q000235:genetics / Q000378:metabolism*; D011993:Recombinant Fusion Proteins / Q000235:genetics / Q000378:metabolism; D013752:Tetracycline / Q000494:pharmacology; D013926:Thrombopoietin / Q000494:pharmacology; D014157:Transcription Factors / Q000235:genetics / Q000378:metabolism*; D014158:Transcription, Genetic; D016335:Zinc Fingers
chemical_list: D015415:Biomarkers; D004268:DNA-Binding Proteins; D050989:GATA2 Transcription Factor; C494711:GATA2 protein, human; C494712:Gata2 protein, mouse; D011500:Protein Synthesis Inhibitors; D011960:Receptors, Estrogen; D011993:Recombinant Fusion Proteins; D014157:Transcription Factors; D004921:Erythropoietin; D004958:Estradiol; D013926:Thrombopoietin; D013752:Tetracycline