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- W4313430114 abstract "Abstract Glioblastoma multiforme (GBM) is a deadly CNS malignancy with an average survival of ~12–18 months post diagnosis. The unique immune environment of the brain and the immunosuppressive features of GBM complicate the use of immunotherapies against these tumors. We aimed to promote the efficacy of αPD-1 against the GL261 murine model of GBM by supplementing this therapy with an engineered IL-2 cytokine. IL-2 therapy has been used clinically for metastatic melanoma and renal cancer, but its short half-life in circulation necessitated high doses to keep the drug concentration sufficiently high. Fusing IL-2 to the mouse serum albumin molecule (MSA-IL-2), extends the cytokine’s half-life. Neither αPD-1 nor MSA-IL-2 are effective monotherapies for GL261 tumors, but the combination provides durable tumor clearance and prevents subsequent rechallenge. Most strikingly, this combination therapy cleared established GL261 tumors even in mice incapable of MHC class I restricted antigen presentation. Instead, therapeutic efficacy was abrogated by the depletion of CD4 T cells. Our combination therapy also reversed multiple key features of GBM-associated peripheral immune suppression, including depressed CD4 T cell counts and dampened MHC class II expression. Our combination therapy’s ability to overcome these immune derangements associated with glioma growth and to function independent of MHC class I restricted antigen presentation enhance the appeal of this therapy for future translational adaptation. This work was supported by the National Institutes of Health (R01 NS103212) and the Mayo Clinic-Koch Institute Cancer Solutions Team Grant" @default.
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- W4313430114 date "2022-05-01" @default.
- W4313430114 modified "2023-09-27" @default.
- W4313430114 title "Combination of αPD-1 and extended half-life IL-2 is effective against the GL261 glioma and uniquely reverses GBM-associated immunosuppression" @default.
- W4313430114 doi "https://doi.org/10.4049/jimmunol.208.supp.122.09" @default.
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