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Efficacy of systemic temozolomide-activated phage-targeted gene therapy in human glioblastoma.
EMBO Molecular Medicine 2019 Februrary 27
Glioblastoma multiforme (GBM) is the most lethal primary intracranial malignant neoplasm in adults and most resistant to treatment. Integration of gene therapy and chemotherapy, chemovirotherapy, has the potential to improve treatment. We have introduced an intravenous bacteriophage (phage) vector for dual targeting of therapeutic genes to glioblastoma. It is a hybrid AAV/phage, AAVP, designed to deliver a recombinant adeno-associated virus genome (rAAV) by the capsid of M13 phage. In this vector, dual tumor targeting is first achieved by phage capsid display of the RGD4C ligand that binds the αv β3 integrin receptor. Second, genes are expressed from a tumor-activated and temozolomide (TMZ)-induced promoter of the glucose-regulated protein, Grp78 Here, we investigated systemic combination therapy using TMZ and targeted suicide gene therapy by the RGD4C/AAVP- Grp78 Firstly, in vitro we showed that TMZ increases endogenous Grp78 gene expression and boosts transgene expression from the RGD4C/AAVP- Grp78 in human GBM cells. Next, RGD4C/AAVP- Grp78 targets intracranial tumors in mice following intravenous administration. Finally, combination of TMZ and RGD4C/AAVP- Grp78 targeted gene therapy exerts a synergistic effect to suppress growth of orthotopic glioblastoma.
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