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• W3216414181 abstract "Although CD8+ T cells undergo autonomous clonal proliferation after antigen stimulation in vivo, the expansion of activated CD4+ T cells is limited by intrinsic factors that are poorly characterized. Using genome-wide CRISPR-Cas9 screens and an in vivo system modeling of antigen-experienced CD4+ T cell recruitment and proliferation during a localized immune response, we identified suppressor of cytokine signaling 1 (SOCS1) as a major nonredundant checkpoint imposing a brake on CD4+ T cell proliferation. Using anti–interleukin-2 receptor (IL-2R) blocking antibodies, interferon-γ receptor (IFN-γR) knockout mice, and transcriptomic analysis, we show that SOCS1 is a critical node integrating both IL-2 and IFN-γ signals to block multiple downstream signaling pathways abrogating CD4+ T helper 1 (TH1) cell response. Inactivation of SOCS1 in both murine and human CD4+ T cell antitumor adoptive therapies restored intratumor accumulation, proliferation/survival, persistence, and polyfunctionality and promoted rejection of established tumors. However, in CD8+ T cells, SOCS1 deletion did not affect the proliferation but rather improved survival and effector functions, which allowed for optimal therapeutic outcome when associated with SOCS1 inactivation in CD4+ T cells. Together, these findings identify SOCS1 as a major intracellular negative checkpoint of adoptive T cell response, opening new possibilities to optimize CAR-T cell therapy composition and efficacy." @default.
• W3216414181 created "2021-12-06" @default.
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• W3216414181 date "2021-12-24" @default.
• W3216414181 modified "2023-10-09" @default.
• W3216414181 title "In vivo genome-wide CRISPR screens identify SOCS1 as intrinsic checkpoint of CD4 ⁺ T _H 1 cell response" @default.
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