Development of lentiviral vectors to study the influence of angiogenic molecules on glioma growth

Authors: Rueda, Naika
Advisor: Vallières, Luc
Abstract: Glioblastomas are highly lethal tumors of the central nervous system characterized by large spread into the surrounding tissues. They modify and migrate along pre-existing blood vessels. This vascular cooption is a process involving the release of angiopoietin-2 (Angpt2) from endothelial cells and binding to the Tie2 receptor. The first goal of this study was to examine the therapeutic potential of two proteins that could interfere with Angpt2, namely Angpt3 and the soluble extracellular domain of Tie2 (sTie2). The second goal was to develop a lentiviral vector capable of delivering such proteins while offering the possibility to identify and destroy the genetically modified cells. To this end, we designed a bicistronic construct expressing the marker enhanced green fluorescent protein (EGFP) fused to the suicide gene herpes simplex virus 1-thymidine kinase (HSVtk). GL261 glioma cells transduced with this vector could be tracked and killed on command by the administration of the prodrug ganciclovir, either in vitro or after implantation into mouse brains. High levels of Angpt3 or sTie2 could be achieved with this vector; however, Angpt3 increased capillary destabilization and glioma growth, whereas sTie2 exerted no effect. Overall, this study helps to understand the importance of the Tie2 signaling pathway in glioma development and the role of Angpt3, but suggests that neither this molecule nor sTie2 are effective agents against malignant gliomas. This study also provides a lentiviral vector design for safer gene therapy.
Document Type: Thèse de doctorat
Issue Date: 2010
Open Access Date: 16 April 2018
Grantor: Université Laval
Collection:Thèses et mémoires

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