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EMBO J. 2006 May 17;25(10):2075-82. Epub 2006 Apr 20.

Regulating angiogenesis at the level of PtdIns-4,5-P2.

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  • 1Schepens Eye Research Institute, Harvard Medical School, Boston, MA 02114, USA.

Abstract

Angiogenesis is a coordinated sequence of cellular responses that result in the outgrowth of new blood vessels. The angiogenic program is regulated by extracellular factors, whose input is integrated at least in part at the level of signal transduction pathways driven by phosphoinositide 3 kinase (PI3K) and phospholipase Cgamma (PLCgamma). Using an in vitro angiogenesis model, we discovered that PI3K was essential for tube formation, whereas PLCgamma promoted regression. The underlying mechanism by which PLCgamma antagonized tube formation appeared to be by competing with PI3K for their common substrate, phosphatidylinositol-4,5-bisphosphate. These studies are the first to identify signaling enzymes involved with vessel regression, and reveal that the angiogenic program can be coordinated by the availability of a membrane lipid.

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