title: Inhibition of the tyrosine phosphatase SHP-2 suppresses angiogenesis in vitro and in vivo.
abstract: Endothelial cell survival is indispensable to maintain endothelial integrity and initiate new vessel formation. We investigated the role of SHP-2 in endothelial cell survival and angiogenesis in vitro as well as in vivo. SHP-2 function in cultured human umbilical vein and human dermal microvascular endothelial cells was inhibited by either silencing the protein expression with antisense-oligodesoxynucleotides or treatment with a pharmacological inhibitor (PtpI IV). SHP-2 inhibition impaired capillary-like structure formation (p < 0.01; n = 8) in vitro as well as new vessel growth ex vivo(p < 0.05; n = 10) and in vivo in the chicken chorioallantoic membrane (p < 0.01, n = 4). Additionally, SHP-2 knock-down abrogated fibroblast growth factor 2 (FGF-2)-dependent endothelial proliferation measured by MTT reduction (p < 0.01; n = 12). The inhibitory effect of SHP-2 knock-down on vessel growth was mediated by increased endothelial apoptosis (annexin V staining, p < 0.05, n = 9), which was associated with reduced FGF-2-induced phosphorylation of phosphatidylinositol 3-kinase (PI3-K), Akt and extracellular regulated kinase 1/2 (ERK1/2) and involved diminished ERK1/2 phosphorylation after PI3-K inhibition (n = 3). These results suggest that SHP-2 regulates endothelial cell survival through PI3-K-Akt and mitogen-activated protein kinase pathways thereby strongly affecting new vessel formation. Thus, SHP-2 exhibits a pivotal role in angiogenesis and may represent an interesting target for therapeutic approaches controlling vessel growth.
authors.affiliation: Institute of Physiology, Medical Policlinic, Ludwig Maximilians University, Munich, Germany.
authors.forename: Hanna
authors.initials: H
authors.lastname: Mannell
authors.forename: Nicole
authors.initials: N
authors.lastname: Hellwig
authors.forename: Torsten
authors.initials: T
authors.lastname: Gloe
authors.forename: Christian
authors.initials: C
authors.lastname: Plank
authors.forename: Hae-Young
authors.initials: HY
authors.lastname: Sohn
authors.forename: Leopold
authors.initials: L
authors.lastname: Groesser
authors.forename: Barbara
authors.initials: B
authors.lastname: Walzog
authors.forename: Ulrich
authors.initials: U
authors.lastname: Pohl
authors.forename: Florian
authors.initials: F
authors.lastname: Krotz
mesh_terms: D020533:Angiogenesis Inhibitors / Q000494:pharmacology*; D000818:Animals; D017209:Apoptosis / Q000187:drug effects; D049109:Cell Proliferation / Q000187:drug effects; D002470:Cell Survival / Q000187:drug effects; D002478:Cells, Cultured; D002642:Chick Embryo; D049033:Chorioallantoic Membrane / Q000098:blood supply*; D042783:Endothelial Cells / Q000187:drug effects* / Q000201:enzymology; D016222:Fibroblast Growth Factor 2 / Q000378:metabolism; D006801:Humans; D051379:Mice; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D018919:Neovascularization, Physiologic / Q000187:drug effects*; D016376:Oligonucleotides, Antisense / Q000378:metabolism*; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D010766:Phosphorylation; D047428:Protein Kinase Inhibitors / Q000494:pharmacology*; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11 / Q000037:antagonists & inhibitors* / Q000235:genetics / Q000378:metabolism; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D015398:Signal Transduction / Q000187:drug effects; D013997:Time Factors; D046509:Tissue Culture Techniques; D014162:Transfection
chemical_list: D020533:Angiogenesis Inhibitors; D016376:Oligonucleotides, Antisense; D047428:Protein Kinase Inhibitors; D016222:Fibroblast Growth Factor 2; D019869:Phosphatidylinositol 3-Kinases; D051057:Proto-Oncogene Proteins c-akt; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; C516724:PTPN11 protein, human; D054592:Protein Tyrosine Phosphatase, Non-Receptor Type 11; C516725:Ptpn11 protein, mouse