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Prepublished online as a Blood First Edition Paper on October 24, 2002; DOI 10.1182/blood-2002-02-0582.

Submitted February 22, 2002
Accepted October 15, 2002
Angiostatin selectively inhibits signaling by hepatocyte growth factor in endothelial and smooth muscle cells
Nadeem Wajih and David C Sane*
Section of Cardiology, Wake Forest University School of Medicine, Winston-Salem, NC, USA
* Corresponding author; email: dsane{at}wfubmc.edu.
Angiostatin, an inhibitor of angiogenesis, contains 3-4 kringles domains that are derived from proteolytic cleavage of plasminogen. The anti-angiogenic effects of angiostatin occur, in part, from its inhibition of endothelial cell surface ATP synthase, integrin functions and pericellular proteolysis. Angiostatin has structural similarities to hepatocyte growth factor ("scatter factor"), a promoter of angiogenesis, that induces proliferation and migration of both endothelial and smooth muscle cells via its cell surface receptor, c-met. We hypothesized that angiostatin might block HGF-induced signaling in endothelial cells and smooth muscle cells. Angiostatin inhibited HGF-induced phosphorylation of c-met, Akt, and ERK1/2. Angiostatin also significantly inhibited proliferation of HUVEC- induced by HGF. In contrast, angiostatin did not inhibit VEGF- or bFGF-induced signaling events or HUVEC proliferation. Angiostatin bound to immobilized truncated c-met produced by A431 cells and could be immunoprecipitated as a complex with soluble c-met. HGF inhibited the binding of 125I-angiostatin to HUVEC. Soluble c-met, produced by several tumor cell lines, could inhibit the anti-angiogenic effect of angiostatin. The disruption of HGF/c-met signaling is a novel mechanism for the anti-angiogenic effect of angiostatin.

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