Functional endothelin ETB receptors are selectively expressed in human oligodendrogliomas
| Autor: | E. Anguelova, C. Daumas-Duport, P. Varlet, Pierre-Olivier Couraud, Sylvie Cazaubon, Nathalie Chaverot, N. Leonard, Frédéric Beuvon |
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| Rok vydání: | 2005 |
| Předmět: |
Cytoplasm
medicine.medical_specialty Oligoastrocytoma Cell Survival Endothelin B Receptor Antagonists Oligodendroglioma Astrocytoma Biology Focal adhesion Cellular and Molecular Neuroscience Piperidines Internal medicine Tumor Cells Cultured medicine Humans Extracellular Signal-Regulated MAP Kinases Receptor Molecular Biology Antihypertensive Agents Cell Nucleus Endothelin-1 Brain Neoplasms Cell Membrane Actin cytoskeleton reorganization Protein-Tyrosine Kinases Receptor Endothelin A medicine.disease Immunohistochemistry Receptor Endothelin B Endothelin 1 Actin Cytoskeleton Endocrinology Focal Adhesion Kinase 1 Focal Adhesion Protein-Tyrosine Kinases Cancer research Signal transduction Glioblastoma Oligopeptides |
| Zdroj: | Molecular Brain Research. 137:77-88 |
| ISSN: | 0169-328X |
| Popis: | Endothelin-1 (ET-1), a vasoactive and mitogenic peptide mainly produced by vascular endothelial cells, may be involved in the progression of several human tumors. Here, we present an immunohistochemical analysis of the expression pattern of ET-1 receptor subtypes (ET(A)-R and ET(B)-R) and a functional study of their potential role in human oligodendrogliomas and oligoastrocytomas. By comparison, we assessed the corresponding expression patterns of glioblastomas. Interestingly, a nuclear localization of ET-1 receptor subtypes (associated or not with a cytoplasmic labeling) was constantly observed in tumor cells from all three glioma types. Moreover, we noted a distinct receptor distribution in the different gliomas: a nuclear expression of ET(B)-R by tumor cells was found to be restricted to oligodendrogliomas and oligoastrocytomas, while a nuclear expression of ET(A)-R was only detected in tumor cells from some glioblastomas. Using primary cultures of oligodendroglial tumor cells, we confirmed the selective expression of nuclear ET(B)-R, together with a plasma membrane expression, and further demonstrated that this receptor was functionally coupled to intracellular signaling pathways known to be involved in cell survival and/or proliferation: extracellular signal-regulated kinase and focal adhesion kinase activation, actin cytoskeleton reorganization. In addition, impairment of ET(B)-R activation in these cells by in vitro treatment with an ET(B)-R-specific antagonist induced cell death. These data point to ET-1 as a possible survival factor for oligodendrogliomas via ET(B)-R activation and suggest that ET(B)-R-specific antagonists might constitute a potential therapeutic alternative for oligodendrogliomas. |
| Databáze: | OpenAIRE |
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