title: Expression of an Ets-1 dominant-negative mutant perturbs normal and tumor angiogenesis in a mouse ear model.
abstract: We and others have shown that members of the Ets family of transcription factors are involved in morphogenic properties of endothelial cells in vitro. To investigate the role of these factors in the transcriptional regulation of angiogenesis in vivo, we set up a nontraumatic model that allows daily macroscopic examination of both growth factor- and tumor-induced angiogenesis in mouse ears. In the same animal, we were thus able to record variations in the patterns of neovessels induced and cell populations recruited by the angiogenic factors FGF-2 and VEGF. In this model, inhibition of FGF-2-induced angiogenesis by the pharmacological compound TNP-470 was readily observed, demonstrating that the mouse ear model is also useful in the evaluation of antiangiogenic strategies. Our functional analysis of Ets transcription factors activity utilized a competitor protein, Ets1-DB, a dominant negative Ets1 mutant lacking the transactivation domain. Retrovirus-mediated expression of Ets1-DB inhibited FGF-2-induced angiogenesis, while the expression of Ets1-DB in cancerous and stromal cells disturbed tumor-induced angiogenesis. These results illustrate the value of the ear model and highlight the role of Ets family members in the transcriptional regulation of tumor angiogenesis.
authors.affiliation: FRE 2353 CNRS/Institut Pasteur de Lille/Université Lille 2, Institut de Biologie de Lille, France.
authors.forename: Albin
authors.initials: A
authors.lastname: Pourtier-Manzanedo
authors.forename: Chantal
authors.initials: C
authors.lastname: Vercamer
authors.forename: Eric
authors.initials: E
authors.lastname: Van Belle
authors.forename: Virginie
authors.initials: V
authors.lastname: Mattot
authors.forename: Frederic
authors.initials: F
authors.lastname: Mouquet
authors.forename: Bernard
authors.initials: B
authors.lastname: Vandenbunder
mesh_terms: D000818:Animals; D004423:Ear / Q000473:pathology*; D016228:Endothelial Growth Factors / Q000502:physiology; D005260:Female; D016222:Fibroblast Growth Factor 2 / Q000502:physiology; D005799:Genes, Dominant; D005822:Genetic Vectors; D036341:Intercellular Signaling Peptides and Proteins / Q000502:physiology; D008222:Lymphokines / Q000502:physiology; D051379:Mice; D008819:Mice, Nude; D008856:Microscopy, Fluorescence; D009154:Mutation; D009368:Neoplasm Transplantation; D009374:Neoplasms, Experimental / Q000098:blood supply / Q000235:genetics*; D009389:Neovascularization, Pathologic / Q000235:genetics*; D050784:Proto-Oncogene Protein c-ets-1; D011518:Proto-Oncogene Proteins / Q000235:genetics*; D050783:Proto-Oncogene Proteins c-ets; D014157:Transcription Factors / Q000235:genetics*; D042461:Vascular Endothelial Growth Factor A; D042442:Vascular Endothelial Growth Factors
chemical_list: D016228:Endothelial Growth Factors; C494042:Ets1 protein, mouse; D036341:Intercellular Signaling Peptides and Proteins; D008222:Lymphokines; D050784:Proto-Oncogene Protein c-ets-1; D011518:Proto-Oncogene Proteins; D050783:Proto-Oncogene Proteins c-ets; D014157:Transcription Factors; D042461:Vascular Endothelial Growth Factor A; D042442:Vascular Endothelial Growth Factors; D016222:Fibroblast Growth Factor 2