Tumor cells permissive to Maraba virus MG1 infection and replication (MG1-permissive tumor cells)

Tumor cells permissive to MG1 infection and replication refer to malignant cells that exhibit specific vulnerabilities, primarily defects in the Type I interferon (IFN) antiviral signaling pathway, which allow the Maraba virus MG1 to selectively infect and replicate within them. MG1 is an engineered oncolytic rhabdovirus designed with mutations in its G and L proteins to enhance its safety profile by making it hypersensitive to IFN, thereby sparing healthy cells with intact antiviral defenses (Brun et al., 2010). In permissive tumor cells, the virus replicates uncontrollably, leading to direct oncolysis and the release of tumor-associated antigens and pathogen-associated molecular patterns. This process transforms the immunosuppressive tumor microenvironment into an immunologically hot one, stimulating a systemic immune response against the cancer. Clinical applications often involve using MG1 as a vaccine vector (e.g., MG1-MAGEA3) to prime or boost T-cell responses against specific tumor antigens (Pol et al., 2014). The primary entry receptor for Maraba virus is believed to be the low-density lipoprotein receptor (LDLR) or its family members, which are widely expressed on many cell types, making the intracellular IFN defect the primary gatekeeper for selectivity (Finkelshtein et al., 2013). The permissiveness of these cells is a critical determinant of the therapeutic efficacy of MG1-based oncolytic immunotherapy.

Other names

MG1-susceptible cancer cellsIFN-deficient tumor cellsMaraba virus-permissive cells

Selective oncolytic viral replication in cells with impaired Type I interferon signaling, leading to direct cell lysis and the induction of systemic anti-tumor immunity.