PMID:17413041

Citation	Staniszewska, I, Zaveri, S, Del Valle, L, Oliva, I, Rothman, VL, Croul, SE, Roberts, DD, Mosher, DF, Tuszynski, GP and Marcinkiewicz, C (2007) Interaction of alpha9beta1 integrin with thrombospondin-1 promotes angiogenesis. Circ. Res. 100:1308-16
Abstract	Thrombospondin-1 is a multifunctional protein interacting with several cell surface receptors including integrins. We found that it is a ligand for alpha9beta1 integrin, and has an integrin binding site within its N-terminal domain (NoC1). Interaction of thrombospondin-1 and its recombinant NoC1 domain with alpha9beta1 integrin was confirmed in ELISA and cell adhesion assays. Binding of NoC1 to cells expressing alpha9beta1 integrin activated signaling proteins such as Erk1/2 and paxillin. Blocking of this integrin by monoclonal antibody and the met-leu-asp-disintegrin inhibited dermal human microvascular endothelial cell proliferation and NoC1-induced migration of these cells. Immunohistochemical studies revealed that alpha9beta1 is expressed on microvascular endothelium in several organs including skin, lung, heart and brain. NoC1 induced neovascularization in an experimental quail chorioallantoic membrane system and Matrigel plug formation assay in mice. This proangiogenic activity of NoC1 in vivo was inhibited by alpha9beta1 inhibitors. In summary, our results revealed that alpha9beta1 integrin expressed on microvascular endothelial cells interacts with thrombospondin-1, and this interaction is involved in modulation of angiogenesis.
Links	PubMed Online version:10.1161/01.RES.0000266662.98355.66
Keywords	Cell Adhesion; Cell Movement; Cell Proliferation; Endothelial Cells/cytology; Humans; Integrins/physiology; K562 Cells; Neovascularization, Physiologic; Protein Structure, Tertiary; Thrombospondin 1/chemistry; Thrombospondin 1/physiology
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Annotations

Gene product	Qualifier	GO Term	Evidence Code	with/from	Aspect	Extension	Notes	Status
HUMAN:TSP1	involved_in	GO:0001937: negative regulation of endothelial cell proliferation	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete
HUMAN:TSP1	involved_in	GO:0000187: activation of MAPK activity	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete
HUMAN:TSP1	involved_in	GO:0045766: positive regulation of angiogenesis	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete
HUMAN:TSP1	involved_in	GO:0042327: positive regulation of phosphorylation	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete
HUMAN:TSP1	involved_in	GO:0030335: positive regulation of cell migration	ECO:0000315: mutant phenotype evidence used in manual assertion		P		Seeded From UniProt	complete
HUMAN:TSP1	enables	GO:0005178: integrin binding	ECO:0000315: mutant phenotype evidence used in manual assertion		F		Seeded From UniProt	complete

References

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