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Lee, Sang Hoon; Schloss, Derrick J.; Jarvis, Lesley; Krasnow, Mark A.; Swain, Judith L.
Journal of biological chemistry/The Journal of biological chemistry, 02/2001, Letnik: 276, Številka: 6Journal Article
Sprouty negatively modulates branching morphogenesis in the Drosophila tracheal system. To address the role of mammalian Sprouty homologues in angiogenesis, another form of branching morphogenesis, a recombinant adenovirus engineered to express murine Sprouty-4 selectively in endothelial cells, was injected into the sinus venosus of embryonic day 9.0 cultured mouse embryos. Sprouty-4 expression inhibited branching and sprouting of small vessels, resulting in abnormal embryonic development. In vitro, Sprouty-4 inhibited fibroblast growth factor and vascular endothelial cell growth factor-mediated cell proliferation and migration and prevented basic fibroblast growth factor and vascular endothelial cell growth factor-induced MAPK phosphorylation in endothelial cells, indicating inhibition of tyrosine kinase-mediated signaling pathways. The ability of constitutively activated mutant RasL61 to rescue Sprouty-4 inhibition of MAPK phosphorylation suggests that Sprouty inhibits receptor tyrosine kinase signaling upstream of Ras. Thus, Sprouty may regulate angiogenesis in normal and disease processes by modulating signaling by endothelial tyrosine kinases.
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JCR | SNIP | JCR | SNIP | JCR | SNIP | JCR | SNIP |
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in: SICRIS
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