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EphB4 mediates resistance to antiangiogenic therapy in experimental glioma
INTRODUCTION: Alterations in vascular morphogenesis are hallmarks of antiangiogenesis-resistant tumor vessels. Vascular morphogenesis is regulated by ephrinB2-EphB4 system which may induce different biological effects depending on the oncological and molecular contexts. It was the aim of the current...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Springer Netherlands
2018
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6208883/ https://www.ncbi.nlm.nih.gov/pubmed/29987450 http://dx.doi.org/10.1007/s10456-018-9633-6 |
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author | Uhl, Christian Markel, Moritz Broggini, Thomas Nieminen, Melina Kremenetskaia, Irina Vajkoczy, Peter Czabanka, Marcus |
author_facet | Uhl, Christian Markel, Moritz Broggini, Thomas Nieminen, Melina Kremenetskaia, Irina Vajkoczy, Peter Czabanka, Marcus |
author_sort | Uhl, Christian |
collection | PubMed |
description | INTRODUCTION: Alterations in vascular morphogenesis are hallmarks of antiangiogenesis-resistant tumor vessels. Vascular morphogenesis is regulated by ephrinB2-EphB4 system which may induce different biological effects depending on the oncological and molecular contexts. It was the aim of the current study to characterize the influence of EphB4 on tumor microcirculation after antiangiogenic treatment using different SF126 glioma models. MATERIALS AND METHODS: Using an ecotropic transfection system, empty vector (pLXSN) or EphB4 (EphB4(OE)) overexpressing Phoenix-ECO cells were coimplanted with SF126 glioma cells subcutaneously (dorsal skinfold chamber, DSC) and orthotopically (cranial window, CW). Tumor volume was assessed by MRI. Intravital microscopy (IVM) allowed microcirculatory analysis (total {TVD} and functional vessel density {FVD}, diameter {D}, and permeability index {PI}) before and after antiangiogenic treatment (Sunitinib: DSC: 40 mg/kg BW, 6 days; CW: 80 mg/kg BW, 4 days). Immunohistochemistry included Pecam–Desmin, Ki67, TUNEL, and Caspase 3 stainings. RESULTS: EphB4(OE) induced large and treatment-resistant tumor vessels (FVD: Control/Su: 110 ± 23 cm/cm(2) vs. EphB4(OE)/Su: 103 ± 42 cm/cm(2)). Maintenance of pericyte–endothelial cell interactions (Control: 80 ± 12 vs. Control/Su: 47 ± 26%; EphB4(OE): 88 ± 9 vs. EphB4(OE)/Su: 74 ± 25%) and reduced antiproliferative (Control: 637 ± 80 vs. Control/Su: 110 ± 22; EphB4(OE): 298 ± 108 vs. EphB4(OE)/Su: 213 ± 80) and proapoptotic responses (Control: 196 ± 25 vs. Control / Su: 404 ± 60; EphB4(OE): 183 ± 20 vs. EphB4(OE)/Su: 270 ± 66) were observed under EphB4 overexpression. CONCLUSION: EphB4 overexpression leads to vascular resistance by altering vascular morphogenesis, pericyte coverage, and cellular proliferation/apoptosis in experimental SF126 glioma models. |
format | Online Article Text |
id | pubmed-6208883 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2018 |
publisher | Springer Netherlands |
record_format | MEDLINE/PubMed |
spelling | pubmed-62088832018-11-09 EphB4 mediates resistance to antiangiogenic therapy in experimental glioma Uhl, Christian Markel, Moritz Broggini, Thomas Nieminen, Melina Kremenetskaia, Irina Vajkoczy, Peter Czabanka, Marcus Angiogenesis Original Paper INTRODUCTION: Alterations in vascular morphogenesis are hallmarks of antiangiogenesis-resistant tumor vessels. Vascular morphogenesis is regulated by ephrinB2-EphB4 system which may induce different biological effects depending on the oncological and molecular contexts. It was the aim of the current study to characterize the influence of EphB4 on tumor microcirculation after antiangiogenic treatment using different SF126 glioma models. MATERIALS AND METHODS: Using an ecotropic transfection system, empty vector (pLXSN) or EphB4 (EphB4(OE)) overexpressing Phoenix-ECO cells were coimplanted with SF126 glioma cells subcutaneously (dorsal skinfold chamber, DSC) and orthotopically (cranial window, CW). Tumor volume was assessed by MRI. Intravital microscopy (IVM) allowed microcirculatory analysis (total {TVD} and functional vessel density {FVD}, diameter {D}, and permeability index {PI}) before and after antiangiogenic treatment (Sunitinib: DSC: 40 mg/kg BW, 6 days; CW: 80 mg/kg BW, 4 days). Immunohistochemistry included Pecam–Desmin, Ki67, TUNEL, and Caspase 3 stainings. RESULTS: EphB4(OE) induced large and treatment-resistant tumor vessels (FVD: Control/Su: 110 ± 23 cm/cm(2) vs. EphB4(OE)/Su: 103 ± 42 cm/cm(2)). Maintenance of pericyte–endothelial cell interactions (Control: 80 ± 12 vs. Control/Su: 47 ± 26%; EphB4(OE): 88 ± 9 vs. EphB4(OE)/Su: 74 ± 25%) and reduced antiproliferative (Control: 637 ± 80 vs. Control/Su: 110 ± 22; EphB4(OE): 298 ± 108 vs. EphB4(OE)/Su: 213 ± 80) and proapoptotic responses (Control: 196 ± 25 vs. Control / Su: 404 ± 60; EphB4(OE): 183 ± 20 vs. EphB4(OE)/Su: 270 ± 66) were observed under EphB4 overexpression. CONCLUSION: EphB4 overexpression leads to vascular resistance by altering vascular morphogenesis, pericyte coverage, and cellular proliferation/apoptosis in experimental SF126 glioma models. Springer Netherlands 2018-07-10 2018 /pmc/articles/PMC6208883/ /pubmed/29987450 http://dx.doi.org/10.1007/s10456-018-9633-6 Text en © The Author(s) 2018 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. |
spellingShingle | Original Paper Uhl, Christian Markel, Moritz Broggini, Thomas Nieminen, Melina Kremenetskaia, Irina Vajkoczy, Peter Czabanka, Marcus EphB4 mediates resistance to antiangiogenic therapy in experimental glioma |
title | EphB4 mediates resistance to antiangiogenic therapy in experimental glioma |
title_full | EphB4 mediates resistance to antiangiogenic therapy in experimental glioma |
title_fullStr | EphB4 mediates resistance to antiangiogenic therapy in experimental glioma |
title_full_unstemmed | EphB4 mediates resistance to antiangiogenic therapy in experimental glioma |
title_short | EphB4 mediates resistance to antiangiogenic therapy in experimental glioma |
title_sort | ephb4 mediates resistance to antiangiogenic therapy in experimental glioma |
topic | Original Paper |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6208883/ https://www.ncbi.nlm.nih.gov/pubmed/29987450 http://dx.doi.org/10.1007/s10456-018-9633-6 |
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