Interleukin-13 Displaying Retargeted Oncolytic Measles Virus Strains Have Significant Activity Against Gliomas With Improved Specificity

Allen, Cory; Paraskevakou, Georgia; Iankov, Ianko; Giannini, Caterina; Schroeder, Mark; Sarkaria, Jann; Puri, Raj K; Russell, Stephen J; Galanis, Evanthia
September 2008
Molecular Therapy;Sep2008, Vol. 16 Issue 9, p1556
Academic Journal
The majority of glioblastoma multiforme (GBM) tumors (80%) overexpress interleukin-13 receptor α2 (IL-13Rα2), but there is no expression of IL-13Rα2 in normal brain. Vaccine strains of measles virus have significant antitumor activity against gliomas. We tested the hypothesis that measles virus entry could be retargeted via the IL-13Rα2. MV-GFP-HAA-IL-13 was generated from the Edmonston-NSe vaccine strain, by displaying human IL-13 at the C-terminus of the H protein, and introducing CD46 and signaling lymphocyte activation molecule (SLAM)-ablating mutations in H. The IL-13 retargeted virus showed significant cytopathic effect (CPE) against IL-13Rα2 overexpressing glioma lines, and lack of CPE/viral replication in normal human astrocytes and normal human fibroblasts not expressing IL-13Rα2. In vivo treatment of orthotopically implanted GBM12 xenografts demonstrated significant prolongation of survival in mice treated with the retargeted strain (P < 0.0001), and comparable activity between the IL-13R retargeted strain and MV-GFP (P = 0.6377). In contrast to MV-GFP-treated mice, administration of the retargeted strain in the central nervous system of measles replication-permissive Ifnarko CD46 Ge mice resulted in lack of neurotoxicity. Strains of measles virus retargeted against the glioma-specific IL-13Rα2 receptor have comparable therapeutic efficacy, and improved specificity as compared with the unmodified measles virus strain MV-GFP in vitro and in vivo.Molecular Therapy (2008) 16 9, 1556–1564 doi:10.1038/mt.2008.152


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