Effector CD8+ T-cell Engraftment and Antitumor Immunity in Lymphodepleted Hosts Is IL7R? Dependent.

ABSTRACT: Adoptive cellular therapy, in which activated tumor-reactive T cells are transferred into lymphodepleted recipients, is a promising cancer treatment option. Activation of T cells decreases IL7 responsiveness; therefore, IL15 is generally considered the main driver of effector T-cell responses in this setting. However, we found in lymphodepleted mice that CD8(+) T cells activated with IL12 showed enhanced engraftment that was initially dependent on host IL7, but not IL15. Mechanistically, enhanced IL7 responsiveness was conferred by elevated IL7R? expression, which was critical for antitumor immunity. Elevated IL7R? expression was achievable without IL12, as polyclonal CD8(+) T cells activated with high T-cell receptor (TCR) stimulation depended on T-cell IL7R? expression and host IL7 for maximal engraftment. Finally, IL12 conditioning during the activation of human CD8(+) T cells, including TCR-modified T cells generated using a clinically relevant protocol, led to enhanced IL7R? expression. Our results demonstrate the importance of the donor IL7R?/host IL7 axis for effector CD8(+) T-cell engraftment and suggest novel strategies to improve adoptive cellular therapy as a cancer treatment.

SUBMITTER: Johnson CB 

PROVIDER: S-EPMC4766846 | biostudies-literature | 2015 Dec

REPOSITORIES: biostudies-literature