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Prepublished online as a Blood First Edition Paper on October 24, 2002; DOI 10.1182/blood-2002-02-0582.
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Blood, 1 March 2003, Vol. 101, No. 5, pp. 1857-1863
HEMOSTASIS, THROMBOSIS, AND VASCULAR BIOLOGY
Angiostatin selectively inhibits signaling by hepatocyte growth
factor in endothelial and smooth muscle cells
Nadeem Wajih and
David C. Sane
From the Wake Forest University School of Medicine,
Section of Cardiology, Winston-Salem, NC.
Angiostatin, an inhibitor of angiogenesis, contains 3 to 4 kringle
domains that are derived from proteolytic cleavage of plasminogen. The
antiangiogenic effects of angiostatin occur, in part, from its
inhibition of endothelial cell surface adenosine
triphosphate synthase, integrin functions, and pericellular
proteolysis. Angiostatin has structural similarities to hepatocyte
growth factor (HGF; "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 and smooth muscle cells. Angiostatin inhibited
HGF-induced phosphorylation of c-met, Akt, and ERK1/2. Angiostatin
also significantly inhibited proliferation of human umbilical vein
endothelial cells (HUVECs) induced by HGF. In contrast,
angiostatin did not inhibit vascular endothelial growth factor
(VEGF)-or basic fibroblast growth factor (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 HUVECs. Soluble c-met,
produced by several tumor cell lines, could inhibit the antiangiogenic
effect of angiostatin. The disruption of HGF/c-met signaling is a novel
mechanism for the antiangiogenic effect of angiostatin.

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