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- W2590350007 abstract "Systemic viroimmunotherapy activates endogenous innate and adaptive immune responses against both viral and tumor antigens. We have shown that therapy with vesicular stomatitis virus (VSV) engineered to express a tumor-associated antigen activates antigen-specific adoptively transferred T cells (adoptive cell therapy, ACT) in vivo to generate effective therapy. The overall goal of this study was to phenotypically characterize the immune response to VSV+ACT therapy and use the information gained to rationally improve combination therapy. We observed rapid expansion of blood CD8+ effector cells acutely following VSV therapy with markedly high expression of the immune checkpoint molecules PD-1 and TIM-3. Using these data, we tested a treatment schedule incorporating mAb immune checkpoint inhibitors with VSV+ACT treatment. Unlike clinical scenarios, we delivered therapy at early time points following tumor establishment and treatment. Our goal was to potentiate the immune response generated by VSV therapy to achieve durable control of metastatic disease. Despite the high frequency of endogenous PD-1+ TIM-3+ CD8+ T cells following virus administration, antibody blockade did not improve survival. These findings provide highly significant information about response kinetics to viroimmunotherapy and juxtapose the clinical use of checkpoint inhibitors against chronically dysfunctional T cells and the acute T cell response to oncolytic viruses. Systemic viroimmunotherapy activates endogenous innate and adaptive immune responses against both viral and tumor antigens. We have shown that therapy with vesicular stomatitis virus (VSV) engineered to express a tumor-associated antigen activates antigen-specific adoptively transferred T cells (adoptive cell therapy, ACT) in vivo to generate effective therapy. The overall goal of this study was to phenotypically characterize the immune response to VSV+ACT therapy and use the information gained to rationally improve combination therapy. We observed rapid expansion of blood CD8+ effector cells acutely following VSV therapy with markedly high expression of the immune checkpoint molecules PD-1 and TIM-3. Using these data, we tested a treatment schedule incorporating mAb immune checkpoint inhibitors with VSV+ACT treatment. Unlike clinical scenarios, we delivered therapy at early time points following tumor establishment and treatment. Our goal was to potentiate the immune response generated by VSV therapy to achieve durable control of metastatic disease. Despite the high frequency of endogenous PD-1+ TIM-3+ CD8+ T cells following virus administration, antibody blockade did not improve survival. These findings provide highly significant information about response kinetics to viroimmunotherapy and juxtapose the clinical use of checkpoint inhibitors against chronically dysfunctional T cells and the acute T cell response to oncolytic viruses." @default.
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- W2590350007 date "2017-04-01" @default.
- W2590350007 modified "2023-09-26" @default.
- W2590350007 title "Inhibitory Receptors Induced by VSV Viroimmunotherapy Are Not Necessarily Targets for Improving Treatment Efficacy" @default.
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- W2590350007 doi "https://doi.org/10.1016/j.ymthe.2017.01.023" @default.
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