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Here, we describe the construction and testing of a novel herpes simplex virus type 1 (HSV-1) derived oncolytic virus (OV): 34.5ENVE (viral ICP34.5 Expressed by Nestin promotor and Vstat120 Expressing), for the treatment of cancer. This virus showed significant glioma-specific killing and antiangiogenic effects in vitro and in vivo. Treatment of subcutaneous and intracranial glioma-bearing mice with 34.5ENVE showed a significant increase in median survival of mice in four different glioma models. Histology and dynamic contrast-enhanced magnetic resonance imaging (DCE-MRI) revealed reduced microvessel density (MVD) and increased tumoral necrosis in 34.5ENVE-treated tumor tissue compared to control OV-treated tumor tissue. Collectively, these results describe the construction, efficacy, and impact on tumor microenvironment of a transcriptionally driven OV armed with Vstat120 gene expression. These preclinical results will facilitate future clinical testing of 34.5ENVE.
Targeted inhibition of oncogenic miRNA-21 has been proposed to treat glioblastoma by rescuing tumor suppressors, PTEN and PDCD4. However, systemic delivery of anti-miR-21 sequences requires a robust and efficient delivery platform to successfully inhibit this druggable target. Three-way-junction (3WJ)-based RNA nanoparticles (RNP), artificially derived from pRNA of bacteriophage phi29 DNA packaging motor, was recently shown to target glioblastoma. Here, we report that multi-valent folate (FA)-conjugated 3WJ RNP constructed to harbor anti-miR-21 LNA sequences (FA-3WJ-LNA-miR21) specifically targeted and delivered anti-miR-21 LNA and knocked down miR-21 expression in glioblastoma cells in vitro and in vivo with favorable biodistribution. Systemically injected FA-3WJ-LNA-miR21 RNP efficiently rescued PTEN and PDCD4, resulting in glioblastoma cell apoptosis and tumor growth regression. Overall survival rate was also significantly improved by FA-3WJ-LNA-miR21 RNP. These results are indicative of the clinical benefit of FA-3WJ RNP-based gene therapy for the successful targeted therapy of developing and even recurring glioblastoma.
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