Abstract
TCF-1+ CD8+ T cell populations have emerged as critical determinants for long-lived immunological memory. This cell population has stem-like properties and is implicated in improved disease outcomes by driving sustained killing of infected cells and maintaining the immune-cancer equilibrium. During an immune response, several factors, including antigen deposition and affinity, the inflammatory milieu, and T cell priming dynamics, aggregate to skew CD8+ T cell differentiation. Although these mechanisms are altered between acute and chronic disease settings, phenotypically similar stem-like TCF-1+ CD8+ T cell states are formed in each of these settings. Here, we characterize the specialized microenvironments within lymph nodes and the tumor microenvironment, which foster the generation or re-activation of stem-like TCF-1+ CD8+ T cell populations. We highlight the potential for targeting the stem-like CD8+ T cell niche to enhance vaccination and cancer immunotherapy and to track the trajectory of stem-like CD8+ T cells as biomarkers of therapeutic efficacy.
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