Early Induction of Angiogenetic Signals in Gliomas of GFAP-v-src Transgenic Mice
| Autor: | Johannes A. Hainfellner, Jean-Philippe Theurillat, Alessia Maddalena, Adriano Aguzzi, Jakob Weissenberger |
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| Přispěvatelé: | University of Zurich, Aguzzi, A |
| Rok vydání: | 1999 |
| Předmět: |
Male
Vascular Endothelial Growth Factor A Pathology Angiogenesis medicine.medical_treatment Endothelial Growth Factors Breeding medicine.disease_cause Mice chemistry.chemical_compound Genes Retinoblastoma Lymphokines Neovascularization Pathologic Brain Neoplasms Vascular Endothelial Growth Factors Receptor TIE-1 Receptor TIE-2 Vascular endothelial growth factor Genes src Vascular endothelial growth factor A Female Signal Transduction medicine.medical_specialty Tumor suppressor gene 10208 Institute of Neuropathology Mice Transgenic Receptors Cell Surface 610 Medicine & health Astrocytoma Biology Receptors TIE Pathology and Forensic Medicine Proto-Oncogene Proteins Glial Fibrillary Acidic Protein medicine Animals Receptors Growth Factor RNA Messenger Autocrine signalling Vascular Endothelial Growth Factor Receptor-1 Growth factor Receptor Protein-Tyrosine Kinases Genes p53 Artificial Gene Fusion 2734 Pathology and Forensic Medicine Receptors Vascular Endothelial Growth Factor chemistry Tumor progression Astrocytes Cancer research 570 Life sciences biology Carcinogenesis Regular Articles |
| Zdroj: | Scopus-Elsevier |
| ISSN: | 0002-9440 |
| DOI: | 10.1016/s0002-9440(10)65303-5 |
| Popis: | Angiogenesis is a prerequisite for solid tumor growth. Glioblastoma multiforme, the most common malignant brain tumor, is characterized by extensive vascular proliferation. We previously showed that transgenic mice expressing a GFAP-v-src fusion gene in astrocytes develop low-grade astrocytomas that progressively evolve into hypervascularized glioblastomas. Here, we examined whether tumor progression triggers angiogenetic signals. We found abundant transcription of vascular endothelial growth factor (VEGF) in neoplastic astrocytes at surprisingly early stages of tumorigenesis. VEGF and v-src expression patterns were not identical, suggesting that VEGF activation was not only dependent on v-src. Late-stage gliomas showed perinecrotic VEGF up-regulation similarly to human glioblastoma. Expression patterns of the endothelial angiogenic receptors flt-1, flk-1, tie-1, and tie-2 were similar to those described in human gliomas, but flt-1 was expressed also in neoplastic astrocytes, suggesting an autocrine role in tumor growth. In crossbreeding experiments, hemizygous ablation of the tumor suppressor genes Rb and p53 had no significant effect on the expression of VEGF, flt-1, flk-1, tie-1, and tie-2. Therefore, expression of angiogenic signals is an early event during progression of GFAP-v-src tumors and precedes hypervascularization. Given the close similarities in the progression pattern between GFAP-v-src and human gliomas, the present results suggest that these mice may provide a useful tool for antiangiogenic therapy research. |
| Databáze: | OpenAIRE |
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