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Engineered Oncolytic Poliovirus PVSRIPO Subverts MDA5-Dependent Innate Immune Responses in Cancer Cells. | LitMetric

AI Article Synopsis

Article Abstract

We are pursuing cancer immunotherapy with a neuro-attenuated recombinant poliovirus, PVSRIPO. PVSRIPO is the live attenuated type 1 (Sabin) poliovirus vaccine carrying a heterologous internal ribosomal entry site (IRES) of human rhinovirus type 2 (HRV2). Intratumoral infusion of PVSRIPO is showing promise in the therapy of recurrent WHO grade IV malignant glioma (glioblastoma), a notoriously treatment-refractory cancer with dismal prognosis. PVSRIPO exhibits profound cytotoxicity in infected neoplastic cells expressing the poliovirus receptor CD155. In addition, it elicits intriguing persistent translation and replication, giving rise to sustained type I interferon (IFN)-dominant proinflammatory stimulation of antigen-presenting cells. A key determinant of the inflammatory footprint generated by neoplastic cell infection and its role in shaping the adaptive response after PVSRIPO tumor infection is the virus's inherent relationship to the host's innate antiviral response. In this report, we define subversion of innate host immunity by PVSRIPO, enabling productive viral translation and cytopathogenicity with extremely low multiplicities of infection in the presence of an active innate antiviral IFN response. Engaging innate antiviral responses is considered key for instigating tumor-antigen-specific antitumor immunity with cancer immunotherapy approaches. However, they are a double-edged sword for attempts to enlist viruses in such approaches. In addition to their role in the transition from innate to adaptive immunity, innate antiviral IFN responses may intercept the viral life cycle in cancerous cells, prevent viral cytopathogenicity, and restrict viral spread. This has been shown to reduce overall antitumor efficacy of several proposed oncolytic virus prototypes, presumably by limiting direct cell killing and the ensuing inflammatory profile within the infected tumor. In this report, we outline how an unusual recalcitrance of polioviruses toward innate antiviral responses permits viral cytotoxicity and propagation in neoplastic cells, combined with engaging active innate antiviral IFN responses.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC6146809PMC
http://dx.doi.org/10.1128/JVI.00879-18DOI Listing

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