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Mol Ther Oncolytics. 2017 May 2;5:75-86. doi: 10.1016/j.omto.2017.04.002. eCollection 2017 Jun 16.

Oncolytic Herpes Simplex Virus Inhibits Pediatric Brain Tumor Migration and Invasion.

Author information

1
Leeds Institute of Cancer and Pathology, University of Leeds, Leeds LS9 7TF, UK.
2
Yorkshire Regional Centre for Paediatric Oncology and Haematology, Leeds General Infirmary, Leeds LS1 3EX, UK.
3
Department of Immunology, Mayo Clinic, Rochester, MN 55905, USA.
4
Leeds Institute of Biomedical and Clinical Sciences, University of Leeds, Leeds LS9 7TF, UK.
5
Department of Pathology, St. James's University Hospital, Leeds LS9 7TF, UK.
6
Institut de Recerca Sant Joan de Deu, Barcelona 08950, Spain.
7
Virttu Biologics, Glasgow G11 6NT, UK.
8
Institute of Cancer Research, London SM2 5NG, UK.

Abstract

Pediatric high-grade glioma (pHGG) and diffuse intrinsic pontine glioma (DIPG) are invasive tumors with poor survival. Oncolytic virotherapy, initially devised as a direct cytotoxic treatment, is now also known to act via immune-mediated mechanisms. Here we investigate a previously unreported mechanism of action: the inhibition of migration and invasion in pediatric brain tumors. We evaluated the effect of oncolytic herpes simplex virus 1716 (HSV1716) on the migration and invasion of pHGG and DIPG both in vitro using 2D (scratch assay, live cell imaging) and 3D (spheroid invasion in collagen) assays and in vivo using an orthotopic xenograft model of DIPG invasion. HSV1716 inhibited migration and invasion in pHGG and DIPG cell lines. pHGG cells demonstrated reduced velocity and changed morphology in the presence of virus. HSV1716 altered pHGG cytoskeletal dynamics by stabilizing microtubules, inhibiting glycogen synthase kinase-3, and preventing localized clustering of adenomatous polyposis coli (APC) to the leading edge of cells. HSV1716 treatment also reduced tumor infiltration in a mouse orthotopic xenograft DIPG model. Our results demonstrate that HSV1716 targets the migration and invasion of pHGG and DIPG and indicates the potential of an oncolytic virus (OV) to be used as a novel anti-invasive treatment strategy for pediatric brain tumors.

KEYWORDS:

oncolytic virus paediatric brain tumor invasion migration

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