GliomaBrain NeoplasmsCell DivisionTumor Cells, CulturedCell Line, TumorGlioblastomaAstrocytomaCell ProliferationApoptosisMice, NudeGene Expression Regulation, NeoplasticCell Growth ProcessesNeoplasm InvasivenessSignal TransductionCell SurvivalDacarbazineOptic Nerve GliomaBlotting, WesternNeoplasm TransplantationTransfectionRNA, Small InterferingRNA, MessengerAntineoplastic Agents, AlkylatingCell CycleAntineoplastic AgentsAstrocytesCell MovementXenograft Model Antitumor AssaysCell LineReverse Transcriptase Polymerase Chain ReactionDown-RegulationGliosarcomaBrain Stem NeoplasmsPhosphorylationTransplantation, HeterologousFlow Cytometry