Maintenance of T cell function in the face of chronic antigen stimulation and repeated reactivation for a latent virus infection

LK Mackay, L Wakim, CJ Van Vliet… - The Journal of …, 2012 - journals.aai.org
LK Mackay, L Wakim, CJ Van Vliet, CM Jones, SN Mueller, O Bannard, DT Fearon
The Journal of Immunology, 2012journals.aai.org
Persisting infections are often associated with chronic T cell activation. For certain
pathogens, this can lead to T cell exhaustion and survival of what is otherwise a cleared
infection. In contrast, for herpesviruses, T cells never eliminate infection once it is
established. Instead, effective immunity appears to maintain these pathogens in a state of
latency. We used infection with HSV to examine whether effector-type T cells undergoing
chronic stimulation retained functional and proliferative capacity during latency and …
Abstract
Persisting infections are often associated with chronic T cell activation. For certain pathogens, this can lead to T cell exhaustion and survival of what is otherwise a cleared infection. In contrast, for herpesviruses, T cells never eliminate infection once it is established. Instead, effective immunity appears to maintain these pathogens in a state of latency. We used infection with HSV to examine whether effector-type T cells undergoing chronic stimulation retained functional and proliferative capacity during latency and subsequent reactivation. We found that latency-associated T cells exhibited a polyfunctional phenotype and could secrete a range of effector cytokines. These T cells were also capable of mounting a recall proliferative response on HSV reactivation and could do so repeatedly. Thus, for this latent infection, T cells subjected to chronic Ag stimulation and periodic reactivation retain the ability to respond to local virus challenge.
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