title: Embryonal subregion-derived stromal cell lines from novel temperature-sensitive SV40 T antigen transgenic mice support hematopoiesis.
abstract: Throughout life, the hematopoietic system requires a supportive microenvironment that allows for the maintenance and differentiation of hematopoietic stem cells (HSC). To understand the cellular interactions and molecules that provide these functions, investigators have previously established stromal cell lines from the late gestational stage and adult murine hematopoietic microenvironments. However, the stromal cell microenvironment that supports the emergence, expansion and maintenance of HSCs during mid-gestational stages has been largely unexplored. Since several tissues within the mouse embryo are known to harbor HSCs (i.e. aortagonads-mesonephros, yolk sac, liver), we generated numerous stromal cell clones from these mid-gestational sites. Owing to the limited cell numbers, isolations were performed with tissues from transgenic embryos containing the ts SV40 Tag gene (tsA58) under the transcriptional control of constitutive and ubiquitously expressing promoters. We report here that the growth and cloning efficiency of embryonic cells (with the exception of the aorta) is increased in the presence of the tsA58 transgene. Furthermore, our results show that the large panel of stromal clones isolated from the different embryonal subregions exhibit heterogeneity in their ability to promote murine and human hematopoietic differentiation. Despite our findings of heterogeneity in hematopoietic growth factor gene expression profiles, high-level expression of some factors may influence hematopoietic differentiation. Interestingly, a few of these stromal clones express a recently described chordin-like protein, which is an inhibitor of bone morphogenic proteins and is preferentially expressed in cells of the mesenchymal lineage.
authors.affiliation: Department of Cell Biology and Genetics, Erasmus University, Rotterdam, Netherlands.
authors.forename: Robert A J
authors.initials: RA
authors.lastname: Oostendorp
authors.forename: Alexander J
authors.initials: AJ
authors.lastname: Medvinsky
authors.forename: Nuray
authors.initials: N
authors.lastname: Kusadasi
authors.forename: Naoki
authors.initials: N
authors.lastname: Nakayama
authors.forename: Kirsty
authors.initials: K
authors.lastname: Harvey
authors.forename: Claudia
authors.initials: C
authors.lastname: Orelio
authors.forename: Katrin
authors.initials: K
authors.lastname: Ottersbach
authors.forename: Todd
authors.initials: T
authors.lastname: Covey
authors.forename: Rob E
authors.initials: RE
authors.lastname: Ploemacher
authors.forename: Chris
authors.initials: C
authors.lastname: Saris
authors.forename: Elaine
authors.initials: E
authors.lastname: Dzierzak
mesh_terms: D000818:Animals; D000952:Antigens, Polyomavirus Transforming / Q000235:genetics* / Q000378:metabolism*; D002454:Cell Differentiation / Q000187:drug effects; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D002999:Clone Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D018920:Coculture Techniques; D017077:Culture Media, Conditioned / Q000494:pharmacology; D004622:Embryo, Mammalian / Q000166:cytology*; D018507:Gene Expression Regulation, Developmental / Q000187:drug effects; D006410:Hematopoiesis; D016298:Hematopoietic Cell Growth Factors / Q000235:genetics; D006801:Humans; D008565:Membrane Proteins / Q000378:metabolism; D051379:Mice; D008822:Mice, Transgenic; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D013234:Stem Cells / Q000166:cytology / Q000187:drug effects / Q000378:metabolism; D017154:Stromal Cells / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism; D013696:Temperature
chemical_list: D000952:Antigens, Polyomavirus Transforming; D017077:Culture Media, Conditioned; D016298:Hematopoietic Cell Growth Factors; D008565:Membrane Proteins; D012333:RNA, Messenger