Abstract:Exhausted immune responses to chronic diseases represent a major challenge to global health. To explore their cell fate and plasticity in exhaustion, we analyzed CD4+T cells in a mouse model with regulatable antigen presentation. When the cells are driven through the effector phase, and are then exposed to different levels of persistent antigen, they lose their Th1 functions, upregulate exhaustion markers, resemble naturally anergic cells and become unable to help B cells and, at the highest dose, undergo apop… Show more
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