title: Immortalization of multipotent growth-factor dependent hemopoietic progenitors from mice transgenic for GATA-1 driven SV40 tsA58 gene.
abstract: The transcription factor GATA-1 is required for the normal development of erythroid cells. GATA-1 is also expressed in other hemopoietic cells, suggesting that it might be initially activated in a multipotent progenitor. To immortalize GATA-1-expressing progenitors, we generated mice transgenic for a thermosensitive SV40 T gene, driven by the GATA-1 promoter-enhancer. Immortalized marrow cells grow in culture at 32 degrees C but not at 38 degrees C, and are dependent on erythropoietin (Epo) or interleukin 3 (IL-3). Epo dependent cells express hemoglobin, high levels of GATA-1, GATA-2 and NF-E2 p45 mRNAs, and are positive for stem cell antigen 2 (Sca-2) and the early myeloid marker ER-MP12. IL-3 dependent cells can be derived from Epo dependent lines, and are hemoglobin-, Sca-2- and ER-MP12-negative, have low GATA-1 and NF-E2 p45 mRNA levels, and express myeloid markers Mac-1, F4/80 and Gr-1. Brief treatment of Epo dependent cells with myeloid growth factors (plus Epo) leads to the induction of Mac-1, F4/80 and Gr-1, concomitant with the disappearance from most cells of Sca-2, ER-MP12 and GATA-1 driven T antigen nuclear expression. Thus, the immortalized Epo dependent cells have the property of a progenitor capable of differentiation towards either the erythroid or myeloid lineages. These cells initiate transcription of a proportion of GATA-1 RNA molecules at an upstream promoter, previously known to be expressed only in testis cells.
authors.affiliation: Dip. di Genetica e di Biologia dei Microrganismi, Università di Milano, Italy.
authors.forename: L A
authors.initials: LA
authors.lastname: Cairns
authors.forename: S
authors.initials: S
authors.lastname: Crotta
authors.forename: M
authors.initials: M
authors.lastname: Minuzzo
authors.forename: E
authors.initials: E
authors.lastname: Moroni
authors.forename: F
authors.initials: F
authors.lastname: Granucci
authors.forename: S
authors.initials: S
authors.lastname: Nicolis
authors.forename: R
authors.initials: R
authors.lastname: Schiró
authors.forename: L
authors.initials: L
authors.lastname: Pozzi
authors.forename: B
authors.initials: B
authors.lastname: Giglioni
authors.forename: P
authors.initials: P
authors.lastname: Ricciardi-Castagnoli
mesh_terms: D000818:Animals; D000952:Antigens, Polyomavirus Transforming / Q000235:genetics; D001483:Base Sequence; D002454:Cell Differentiation / Q000235:genetics; D002461:Cell Line, Transformed; D002472:Cell Transformation, Viral / Q000235:genetics; D004268:DNA-Binding Proteins / Q000502:physiology*; D050981:Erythroid-Specific DNA-Binding Factors; D004921:Erythropoietin / Q000502:physiology; D050982:GATA1 Transcription Factor; D006133:Growth Substances / Q000502:physiology*; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D051379:Mice; D008822:Mice, Transgenic; D008969:Molecular Sequence Data; D050983:NF-E2 Transcription Factor; D050984:NF-E2 Transcription Factor, p45 Subunit; D011401:Promoter Regions, Genetic / Q000502:physiology; D013539:Simian virus 40 / Q000235:genetics*; D013696:Temperature; D014157:Transcription Factors / Q000502:physiology*
chemical_list: D000952:Antigens, Polyomavirus Transforming; D004268:DNA-Binding Proteins; D050981:Erythroid-Specific DNA-Binding Factors; D050982:GATA1 Transcription Factor; C494689:Gata1 protein, mouse; D006133:Growth Substances; D050983:NF-E2 Transcription Factor; D050984:NF-E2 Transcription Factor, p45 Subunit; C494693:Nfe2 protein, mouse; D014157:Transcription Factors; D004921:Erythropoietin