Umbilical VeinsHuman Umbilical Vein Endothelial CellsEndothelial CellsEndothelium, VascularCells, CulturedNeovascularization, PhysiologicNeovascularization, PathologicAngiogenesis InhibitorsVascular Endothelial Growth Factor ACell AdhesionEndotheliumE-SelectinCell MovementVascular Cell Adhesion Molecule-1Umbilical ArteriesVeinsAngiogenesis Inducing AgentsUmbilical CordIntercellular Adhesion Molecule-1RNA, MessengerNitric Oxide Synthase Type IIIVascular Endothelial Growth Factor Receptor-2Tumor Necrosis Factor-alphaSignal TransductionCell Adhesion MoleculesEndothelial Growth FactorsThrombinCell ProliferationVascular Endothelial Growth FactorsDose-Response Relationship, DrugLymphokinesChorioallantoic MembraneNitric OxideCulture Media, ConditionedCell DivisionCell LineAntigens, CD31von Willebrand FactorAortaUp-RegulationGene Expression RegulationPhosphorylationCell SurvivalEpoprostenolStress, MechanicalApoptosisCapillariesInterleukin-1Time FactorsInterleukin-8Saphenous VeinFibroblast Growth Factor 2Blotting, WesternNF-kappa BReverse Transcriptase Polymerase Chain ReactionReceptors, Vascular Endothelial Growth FactorEnzyme InhibitorsCoculture TechniquesEnzyme ActivationThromboplastinProto-Oncogene Proteins c-aktFetal BloodMicrocirculationMonocytesCattleGene ExpressionLamininAntigens, CDAngiopoietin-2Angiopoietin-1RNA, Small InterferingTransfectionRecombinant ProteinsDrug CombinationsReceptors, Cell SurfaceEndostatinsIntegrin alphaVbeta3Vascular Endothelial Growth Factor Receptor-1Blood VesselsNeutrophilsHistamineImmunohistochemistryMice, NudePortal VeinP-SelectinCell Line, TumorCapillary PermeabilityCollagenDown-RegulationProteoglycansReactive Oxygen SpeciesReceptors, ThrombinMicrovesselsThrombomodulinReceptors, Growth FactorNitric Oxide SynthaseFlow CytometryReceptor, TIE-2Varicose VeinsMice, Inbred C57BL