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Prepublished online as a Blood First Edition Paper on September 25, 2003; DOI 10.1182/blood-2003-07-2192.

Submitted July 2, 2003
Accepted September 8, 2003
Alphastatin, a 24 amino acid fragment of human fibrinogen, is a potent new inhibitor of activated endothelial cells in vitro and in vivo
Carolyn A Staton, Nicola J Brown, Gary R Rodgers, Kevin P Corke, Simon Tazzyman, James C Underwood, and Claire E Lewis*
Tumour Targeting Group, University of Sheffield Medical School, Sheffield, United Kingdom
Microcirculation Research Unit, University of Sheffield Medical School, Sheffield, United Kingdom
Institute of Cancer Research, University of Sheffield Medical School, Sheffield, United Kingdom
* Corresponding author; email: claire.lewis{at}sheffield.ac.uk.
Angiogenesis, the development of new blood vessels from existing vasculature, is crucial for the development and metastasis of solid tumors. Here, we show for the first time that a 24-amino acid peptide derived from the amino terminus of the alpha chain of human fibrinogen (termed 'alphastatin') has potent anti-angiogenic properties, inhibiting both the migration and tubule formation of human dermal microvascular endothelial cells in response to VEGF or bFGF in vitro. Moreover, alphastatin markedly inhibits the growth of tumors in a syngeneic murine model. Tumors from mice receiving daily injections of alphastatin for 12 days exhibited large areas of intravascular disruption and thrombosis, with substantial cellular necrosis. Importantly, alphastatin administration had no detectable effect on vessels in such healthy tissues as liver, lungs and kidney. Taken together, these data indicate that alphastatin is a potent new anti-angiogenic agent in vitro and anti-vascular agent in vivo.

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