Abstract
Angiostatin, a fragment of plasminogen, has been identified and characterized as an endogenous inhibitor of neovascularization. We show that angiostatin treatment of endothelial cells in the absence of growth factors results in an increased apoptotic index whereas the proliferation index is unchanged. Angiostatin also inhibits migration and tube formation of endothelial cells. Angiostatin treatment has no effect on growth factor-induced signal transduction but leads to an RGD-independent induction of the kinase activity of focal adhesion kinase, suggesting that the biological effects of angiostatin relate to subversion of adhesion plaque formation in endothelial cells.
Publication types
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Research Support, Non-U.S. Gov't
MeSH terms
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Angiostatins
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Antineoplastic Agents / pharmacology*
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Apoptosis / drug effects*
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Cell Adhesion Molecules / metabolism*
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Cells, Cultured
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Endothelium, Vascular / drug effects*
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Endothelium, Vascular / enzymology
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Endothelium, Vascular / physiology
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Enzyme Activation
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Focal Adhesion Kinase 1
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Focal Adhesion Protein-Tyrosine Kinases
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Humans
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Oligopeptides / metabolism*
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Peptide Fragments / pharmacology*
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Phosphorylation
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Plasminogen / pharmacology*
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Protein-Tyrosine Kinases / metabolism*
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Receptor, Insulin / metabolism*
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Signal Transduction / drug effects
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Tyrosine / metabolism
Substances
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Antineoplastic Agents
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Cell Adhesion Molecules
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Oligopeptides
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Peptide Fragments
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Tyrosine
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arginyl-glycyl-aspartic acid
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Angiostatins
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Plasminogen
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Protein-Tyrosine Kinases
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Receptor, Insulin
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Focal Adhesion Kinase 1
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Focal Adhesion Protein-Tyrosine Kinases
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PTK2 protein, human