Integrin alpha2beta1 is the required receptor for endorepellin angiostatic activity.

Abstract	Endorepellin, the C-terminal module of perlecan, has angiostatic activity. Here we provide definitive genetic and biochemical evidence that the functional endorepellin receptor is the alpha2beta1 integrin. Notably, the specific endorepellin binding to the receptor was cation-independent and was mediated by the alpha2 I domain. We show that the anti-angiogenic effects of endorepellin cannot occur in the absence of alpha2beta1. Microvascular endothelial cells from alpha2beta1(-/-) mice, but not those isolated from either wild-type or alpha1beta1(-/-) mice, did not respond to endorepellin. Moreover, syngeneic Lewis lung carcinoma xenografts in alpha2beta1(-/-) mice failed to respond to systemic delivery of endorepellin. In contrast, endorepellin inhibited tumor growth and angiogenesis in the wild-type mice expressing integrin alpha2beta1. We conclude that the angiostatic effects of endorepellin in vivo are mediated by a specific interaction of endorepellin with the alpha2beta1 integrin receptor.
Authors	Benjamin P Woodall, Alexander Nyström, Rex A Iozzo, Johannes A Eble, Stephan Niland, Thomas Krieg, Beate Eckes, Ambra Pozzi, Renato V Iozzo
Journal	The Journal of biological chemistry (J Biol Chem) Vol. 283 Issue 4 Pg. 2335-43 (Jan 25 2008) ISSN: 0021-9258 [Print] United States
PMID	18024432 (Publication Type: Journal Article, Research Support, N.I.H., Extramural, Research Support, Non-U.S. Gov't)
Chemical References	Angiostatic Proteins Heparan Sulfate Proteoglycans Integrin alpha1beta1 Integrin alpha2beta1 Peptide Fragments endorepellin protein, mouse perlecan
Topics	Angiostatic Proteins (genetics, metabolism, pharmacology) Animals Carcinoma, Lewis Lung (genetics, metabolism, pathology) Cell Line, Tumor Endothelium, Vascular (metabolism, pathology) Female Heparan Sulfate Proteoglycans (genetics, metabolism, pharmacology) Humans Integrin alpha1beta1 (genetics, metabolism) Integrin alpha2beta1 (genetics, metabolism) Mice Mice, Knockout Neoplasm Transplantation Neovascularization, Pathologic (genetics, metabolism, pathology) Peptide Fragments (genetics, metabolism, pharmacology) Transplantation, Heterologous

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