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Embryonal subregion-derived stromal cell lines from novel temperature-sensitive SV40 T antigen transgenic mice support hematopoiesis.

TitleEmbryonal subregion-derived stromal cell lines from novel temperature-sensitive SV40 T antigen transgenic mice support hematopoiesis.
Publication TypeJournal Article
Year of Publication2002
AuthorsOostendorp RAJ, Medvinsky AL, Kusadasi N, Nakayama N, Harvey K, Orelio C, Ottersbach K, Covey T, Ploemacher RE, Saris C, Dzierzak E
JournalJ Cell Sci
Volume115
IssuePt 10
Pagination2099-108
Date Published2002 May 15
ISSN0021-9533
KeywordsAnimals, Antigens, Polyomavirus Transforming, Cell Differentiation, Cell Division, Cell Line, Clone Cells, Coculture Techniques, Culture Media, Conditioned, Embryo, Mammalian, Gene Expression Regulation, Developmental, Hematopoiesis, Hematopoietic Cell Growth Factors, Humans, Membrane Proteins, Mice, Mice, Transgenic, RNA, Messenger, Stem Cells, Stromal Cells, Temperature
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.

Alternate JournalJ. Cell. Sci.
PubMed ID11973351
Grant ListR01 DK51077 / DK / NIDDK NIH HHS / United States
RG0345/1999M / RG / CSR NIH HHS / United States
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