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Related Collections Hemostasis, Thrombosis, and Vascular Biology Social Bookmarking                   What's this?  Previous Article  |  Table of Contents  |  Next Article  Blood, 1 April 2002, Vol. 99, No. 7, pp. 2397-2407 HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY Vascular endothelial growth factor receptor Flt-1 negatively regulates developmental blood vessel formation by modulating endothelial cell division Joseph B. Kearney, Carrie A. Ambler, Kelli-Ann Monaco, Natalie Johnson, Rebecca G. Rapoport, and Victoria L. Bautch From the Program in Genetics and Molecular Biology, Department of Biology, University of North Carolina at Chapel Hill, Chapel Hill. Mice lacking the vascular endothelial growth factor (VEGF) receptor flt-1 die of vascular overgrowth, and we are interested in how flt-1 normally prevents this outcome. Our results support a model whereby aberrant endothelial cell division is the cellular mechanism resulting in vascular overgrowth, and they suggest that VEGF-dependent endothelial cell division is normally finely modulated by flt-1 to produce blood vessels. Flt-1/ embryonic stem cell cultures had a 2-fold increase in endothelial cells by day 8, and the endothelial cell mitotic index was significantly elevated before day 8. Flt-1 mutant embryos also had an increased endothelial cell mitotic index, indicating that aberrant endothelial cell division occurs in vivo in the absence of flt-1. The flt-1 mutant vasculature of the cultures was partially rescued by mitomycin C treatment, consistent with a cell division defect in the mutant background. Analysis of cultures at earlier time points showed no significant differences until day 5, when flt-1 mutant cultures had increased -galactosidase+ cells, indicating that the expansion of flt-1 responsive cells occurs after day 4. Mitomycin C treatment blocked this early expansion, suggesting that aberrant division of angioblasts and/or endothelial cells is a hallmark of the flt-1 mutant phenotype throughout vascular development. Consistent with this model is the finding that expansion of platelet and endothelial cell adhesion molecule+ and VE-cadherin+ vascular cells in the flt-1 mutant background first occurs between day 5 and day 6. Taken together, these data show that flt-1 normally modulates vascular growth by controlling the rate of endothelial cell division both in vitro and in vivo. © 2002 by The American Society of Hematology.   CiteULike    Connotea    Del.icio.us    Digg    Reddit    Technorati    What's this? This article has been cited by other articles: C. Clapp, S. 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