title: Crosstalk between tumor and endothelial cells promotes tumor angiogenesis by MAPK activation of Notch signaling.
abstract: While significant progress has been made in understanding the induction of tumor vasculature by secreted angiogenic factors, little is known regarding contact-dependent signals that promote tumor angiogenesis. Here, we report that the Notch ligand Jagged1 induced by growth factors via mitogen-activating protein kinase (MAPK) in head and neck squamous cell carcinoma (HNSCC) cells triggered Notch activation in neighboring endothelial cells (ECs) and promoted capillary-like sprout formation. Jagged1-expressing HNSCC cells significantly enhanced neovascularization and tumor growth in vivo. Moreover, the level of Jagged1 was significantly correlated with tumor blood vessel content and associated with HNSCC development. Our results elucidate a novel mechanism by which the direct interplay between tumor cells and ECs promotes angiogenesis through MAPK and Notch signaling pathways.
authors: Laboratory of Molecular Signaling and Apoptosis, Department of Biologic and Materials Sciences, University of Michigan, Ann Arbor, MI 48109, USA.
authors: Qinghua
authors: Q
authors: Zeng
authors: Shenglin
authors: S
authors: Li
authors: Douglas B
authors: DB
authors: Chepeha
authors: Thomas J
authors: TJ
authors: Giordano
authors: Jong
authors: J
authors: Li
authors: Honglai
authors: H
authors: Zhang
authors: Peter J
authors: PJ
authors: Polverini
authors: Jacques
authors: J
authors: Nor
authors: Jan
authors: J
authors: Kitajewski
authors: Cun-Yu
authors: CY
authors: Wang
mesh_terms: D000818:Animals; D002135:Calcium-Binding Proteins; D002294:Carcinoma, Squamous Cell / Q000098:blood supply / Q000473:pathology*; D004730:Endothelium, Vascular / Q000378:metabolism*; D004789:Enzyme Activation; D005260:Female; D006258:Head and Neck Neoplasms / Q000098:blood supply / Q000473:pathology*; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins; D000072100:Jagged-1 Protein; D008024:Ligands; D008565:Membrane Proteins / Q000235:genetics / Q000378:metabolism*; D051379:Mice; D016513:Mice, SCID; D020928:Mitogen-Activated Protein Kinases / Q000378:metabolism*; D009369:Neoplasms / Q000098:blood supply / Q000188:drug therapy / Q000473:pathology; D009389:Neovascularization, Pathologic / Q000473:pathology*; D034741:RNA, Small Interfering / Q000494:pharmacology; D011956:Receptors, Cell Surface / Q000378:metabolism; D051880:Receptors, Notch; D000072099:Serrate-Jagged Proteins; D015398:Signal Transduction
chemical_list: D002135:Calcium-Binding Proteins; D036341:Intercellular Signaling Peptides and Proteins; C000606273:JAG1 protein, human; C000606274:Jag1 protein, mouse; D000072100:Jagged-1 Protein; D008024:Ligands; D008565:Membrane Proteins; D034741:RNA, Small Interfering; D011956:Receptors, Cell Surface; D051880:Receptors, Notch; D000072099:Serrate-Jagged Proteins; D020928:Mitogen-Activated Protein Kinases