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IL-2/anti-IL-2 complex-based therapy has been proposed as a potential adjunct therapeutic tool to enhance in vivo efficacy of T cell-based immunotherapeutic strategies for chronic viral infections and human cancers. In this study, we demonstrate that IL-2 complex therapy can have discerning effects on CD8(+) T cells depending on their stage of differentiation. To delineate the underlying mechanism for these opposing effects on CD8(+) T cells, we examined the effects of IL-2 therapy during early priming, effector, and memory phases of T cell responses generated following immunization with an adenoviral vector encoding multiple EBV CD8(+) epitopes. IL-2 complex treatment during the early priming phase, which coincided with low levels of IL-2Rβ (CD122) and higher levels of IL-2Rα (CD25) on CD8(+) T cells, did not induce the expansion of effector T cells. In contrast, IL-2 complex treatment following the establishment of memory enhanced the expansion of Ag-specific T cells. Additionally, central memory T cells preferentially expanded following treatment at the expense of effector memory T cell populations. These studies demonstrate how differentiation status of the responding CD8(+) T cells impacts on their responsiveness to IL-2 complexes and highlight that timing of treatment should be considered before implementing this therapy in a clinical setting.

the journal of immunology/the journal of immunology

Differential Outcome of IL-2/Anti–IL-2 Complex Therapy on Effector and Memory CD8+ T Cells following Vaccination with an Adenoviral Vector Encoding EBV Epitopes