“…Using Kiloplex ELISA-based array, we detected 38 proteins significantly accumulated in the supernatant of TMZ-treated glioma cells and in the supernatant of MMP14-overexpressing U87 glioma cells (Supplemental Tables S1 and S2) including MMP2, Plexin B3, Activin A, Draxin and DLL4. Among highly expressed proteins, the DLL4 was of most interest since it was the only one to be associated with negative prognosis un GBM patients 41 : TMZ has no effect on secretion of MMP2 in A172 and U373 cells 42 and recurrent GBM, 43 Plexin B3 plays anti-glioma role, 44 inhibiting cell motility and does not correlate with GBM patient survival, 45 similar to Activin A (using TCGA and Rembrandt databases) and DLL4 is a known ligand of Notch receptor Types 1 and 3, which stimulates release of Notch intracellular domain (NICD) by γ-secretase, followed by NICD nuclear translocation, 46 activation of transcription of genes such as HES 47 and promotion of stemness. 33,34 Treatment of U87 and GBM43 glioma cells with recombinant human DLL4 demonstrates white colocalization of signals from activated Notch3 (NICD3) and expression of MMP14 (Fig.…”