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Putative intermediate precursor between hematogenic endothelial cells and blood cells in the developing embryo
Author(s) -
Fraser Stuart T.,
Ogawa Minetaro,
Yokomizo Tomomasa,
Ito Yoshiaki,
Nishikawa Satomi,
Nishikawa ShinIchi
Publication year - 2003
Publication title -
development, growth and differentiation
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.864
H-Index - 66
eISSN - 1440-169X
pISSN - 0012-1592
DOI - 10.1046/j.1440-169x.2003.00675.x
Subject(s) - adherens junction , ve cadherin , biology , microbiology and biotechnology , population , haematopoiesis , endothelial stem cell , embryonic stem cell , runx1 , cadherin , stem cell , cell , genetics , in vitro , medicine , gene , environmental health
During embryogenesis, endothelial cells are a source of hematopoietic cells. Vascular endothelial (VE)‐cadherin modulates adherens junctions between endothelial cells. How endothelial cells, integrated into the vascular bed via adherens junctions, give rise to free‐floating hematopoietic cells has been examined. Contrary to our previous reports, in this report a cell type simultaneously expressing VE‐cadherin and the hematopoietic marker CD45 was identified, without rigorous enzymatic dissociation of embryonic tissues. In spite of expressing several other endothelial markers such as endothelial cell nitrous oxide synthase (ECNOS) and MECA‐32, this newly defined population failed to produce endothelial colonies when cultured on OP9 stroma, in direct contrast to enzymatically dissociated VE‐cadherin + cells. When isolated from 9.5 days post coitus (d.p.c.) embryos, VE‐cadherin + CD45 + cells generated erythroid, myeloid, but not B lymphoid, cells, also in contrast to VE‐cadherin + cells obtained by enzymatic dissociation. Runx1 null mutant embryos lacked this novel population. Collectively, these results introduce a novel VE‐cadherin + population within the developing embryo, which may represent an intermediate cell type in the transition of hemogenic endothelial cells into blood.