title: Self-renewal and differentiation of a basic fibroblast growth factor-dependent multipotent hematopoietic cell line derived from embryonic stem cells.
abstract: Despite the accumulation of informat on on the origin of hematopoietic stem cells, it is still unclear how these cells are generated in ontogeny. Isolation of cell lines equivalent to early embryonic hematopoietic progenitor cells can be helpful. A multipotent hematopoietic progenitor cell line, A-6, was isolated from H-1 embryonic stem (ES) cells. The self-renewal of A-6 cells was supported by basic-fibroblast growth factor (b-FGF) and their differentiation into definitive erythroid cells, granulocytes and macrophages was induced after co-culture with ST-2 stromal cells. A-6 cells were positive for the surface markers of hematopoietic stem cell, c-kit, CD31, CD34, Flt3/Flk2, PgP-1, and HSA, but were negative for that of the differentiated cells. Reverse transcription-polymerase chain reaction analysis showed that A-6 cells produced mRNA from SCL/tal-1 and GATA-2 genes. Among various cytokines examined, on y stem cell factor (SCF) and Flt3/Flk2 ligand (FL) supported the proliferation of A-6 cells instead of b-FGF. The FL, as well as b-FGF, supported the self-renewal of A-6 cells, whereas SCF induced differentiation into myeloid cells. A-6 cells will be useful for the characterization of hematopoietic progenitor cells derived from ES cells and provide a model system to realize the control mechanisms between self-renewal and different ation of hematopoietic stem cells.
authors.affiliation: Department of Retroviral Regulation, Tokyo Medical and Dental University, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Anzai
authors.forename: M
authors.initials: M
authors.lastname: Nagayoshi
authors.forename: M
authors.initials: M
authors.lastname: Obata
authors.forename: Y
authors.initials: Y
authors.lastname: Ikawa
authors.forename: T
authors.initials: T
authors.lastname: Atsumi
mesh_terms: D000818:Animals; D000943:Antigens, Differentiation; D002454:Cell Differentiation; D002460:Cell Line; D019070:Cell Lineage; D004268:DNA-Binding Proteins / Q000096:biosynthesis; D004622:Embryo, Mammalian / Q000166:cytology; D016222:Fibroblast Growth Factor 2 / Q000494:pharmacology*; D050989:GATA2 Transcription Factor; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000187:drug effects; D008565:Membrane Proteins / Q000494:pharmacology; D051379:Mice; D019089:Stem Cell Factor / Q000096:biosynthesis / Q000494:pharmacology; D013234:Stem Cells / Q000166:cytology*; D014157:Transcription Factors / Q000096:biosynthesis; D015017:Yolk Sac / Q000166:cytology
chemical_list: D000943:Antigens, Differentiation; D004268:DNA-Binding Proteins; D050989:GATA2 Transcription Factor; C494712:Gata2 protein, mouse; D008565:Membrane Proteins; D019089:Stem Cell Factor; D014157:Transcription Factors; C084881:flt3 ligand protein; D016222:Fibroblast Growth Factor 2