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Blood, 1 March 2007, Vol. 109, No. 5, pp. 1962-1970.
Prepublished online as a Blood First Edition Paper on October 24, 2006; DOI 10.1182/blood-2005-10-038893.
Previous Article | Table of Contents | Next Article 
HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY
Cooperation between VEGF and ß3 integrin during cardiac vascular development
Sara M. Weis1,
Jeffrey N. Lindquist1,
Leo A. Barnes1,
Kimberly M. Lutu-Fuga1,
Jianhua Cui1,
Malcolm R. Wood2, and
David A. Cheresh1
1 Moores UCSD Cancer Center, University of California, San Diego;
2 Core Microscopy Facility, The Scripps Research Institute, La Jolla, CA
In the developing myocardium, vascular endothelial growth factor (VEGF)dependent neovascularization occurs by division of existing vessels, a process that persists for several weeks following birth. During this remodeling phase, mRNA expression of ß3 integrin in the heart decreases significantly as vessel maturation progresses. However, in male mice lacking ß3, coronary capillaries fail to mature and continue to exhibit irregular endothelial thickness, endothelial protrusions into the lumen, and expanded cytoplasmic vacuoles. Surprisingly, this phenotype was not seen in female ß3-null mice. Enhanced VEGF signaling contributes to the ß3-null phenotype, because these vessels can be normalized by inhibitors of VEGF or Flk-1. Moreover, intravenous injection of VEGF induces a similar angiogenic phenotype in hearts of adult wild-type mice. These findings show a clear vascular phenotype in the hearts of mice lacking ß3 and suggest this integrin plays a critical role in coronary vascular development and the vascular response to VEGF.

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