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Publication

The VEGF receptor Flt-1 spatially modulates Flk-1 signaling and blood vessel branching.

Authors Kappas NC, Zeng G, Chappell JC, Kearney JB, Hazarika S, Kallianos KG, Patterson C, Annex BH, Bautch VL Submitted By Thomas Coffman on 8/11/2010 Status Published Journal The Journal of cell biology Year 2008 Date Published 6/2/2008 Volume : Pages 181 : 847 - 858 PubMed Reference Abstract Blood vessel formation requires the integrated regulation of endothelial cell proliferation and branching morphogenesis, but how this coordinated regulation is achieved is not well understood. Flt-1 (vascular endothelial growth factor [VEGF] receptor 1) is a high affinity VEGF-A receptor whose loss leads to vessel overgrowth and dysmorphogenesis. We examined the ability of Flt-1 isoform transgenes to rescue the vascular development of embryonic stem cell-derived flt-1-/- mutant vessels. Endothelial proliferation was equivalently rescued by both soluble (sFlt-1) and membrane-tethered (mFlt-1) isoforms, but only sFlt-1 rescued vessel branching. Flk-1 Tyr-1173 phosphorylation was increased in flt-1-/- mutant vessels and partially rescued by the Flt-1 isoform transgenes. sFlt-1-rescued vessels exhibited more heterogeneous levels of pFlk than did mFlt-1-rescued vessels, and reporter gene expression from the flt-1 locus was also heterogeneous in developing vessels. Our data support a model whereby sFlt-1 protein is more efficient than mFlt-1 at amplifying initial expression differences, and these amplified differences set up local discontinuities in VEGF-A ligand availability that are important for proper vessel branching.

Investigators with authorship
Name Institution Thomas Coffman Duke University Medical Center

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