Journal
TRENDS IN IMMUNOLOGY
Volume 44, Issue 4, Pages 276-286Publisher
CELL PRESS
DOI: 10.1016/j.it.2023.02.006
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Reinvigorating exhausted CD8+ T cells is a major goal in immunotherapy for chronic viral infection and cancer. Recent advances have shown that exhausted CD8+ T cells exhibit heterogeneity and can differentiate into either terminally differentiated effector cells or remain exhausted. The potential therapeutic implications of redirecting progenitor CD8+ T cell differentiation towards effector cells are also discussed.
Reinvigorating the function of exhausted CD8+ T cells during chronic viral infection and cancer is a major goal of current immunotherapy regimens. Here, we discuss recent advances in our understanding of exhausted CD8+ T cell heterogeneity as well as the potential differentiation trajectories that exhausted T cells follow during chronic infection and/or cancer. We highlight surmounting evidence suggesting that some T cell clones are divergent in nature and can develop into either terminally differentiated effector or exhausted CD8+ T cells. Lastly, we consider the potential therapeutic implications of such a bifurcation model of CD8+ T cell differentiation, including the intriguing hypothesis that redirecting progenitor CD8+ T cell differentiation along an effector pathway may serve as a novel approach to mitigate T cell exhaustion.
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