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Phenotypic and Functional Alterations in Circulating Memory CD8 T Cells with Time after Primary Infection


Following infection or vaccination, memory CD8 T cells persist at higher numbers and have enhanced functional abilities compared to naïve cells, providing immune hosts with increased protection from viral, bacterial, or parasitic infection. Protection provided by memory CD8 T cells depends on the numbers, quality (functional abilities), and location of cells present at the time of re-infection. While memory CD8 T cells can be maintained for great lengths of time, how time influences qualitative properties of these cells remains largely unknown. We show that the phenotype and functions of circulating memory CD8 T cells, including cytokine production, proliferation, and mitochondrial function following re-infection improves with time after infection. We also show that changes in function are not due solely to changes in subset composition of the memory pool. Importantly, due to enhanced proliferative and metabolic abilities, memory CD8 T cells analyzed late after infection were more protective against a chronic viral infection. Our study shows that the properties of memory CD8 T cells continue to change with time, and that the protective outcome of vaccination may depend on the timing of re-infection relative to the initial immunization.


Vyšlo v časopise: Phenotypic and Functional Alterations in Circulating Memory CD8 T Cells with Time after Primary Infection. PLoS Pathog 11(10): e32767. doi:10.1371/journal.ppat.1005219
Kategorie: Research Article
prolekare.web.journal.doi_sk: https://doi.org/10.1371/journal.ppat.1005219

Souhrn

Following infection or vaccination, memory CD8 T cells persist at higher numbers and have enhanced functional abilities compared to naïve cells, providing immune hosts with increased protection from viral, bacterial, or parasitic infection. Protection provided by memory CD8 T cells depends on the numbers, quality (functional abilities), and location of cells present at the time of re-infection. While memory CD8 T cells can be maintained for great lengths of time, how time influences qualitative properties of these cells remains largely unknown. We show that the phenotype and functions of circulating memory CD8 T cells, including cytokine production, proliferation, and mitochondrial function following re-infection improves with time after infection. We also show that changes in function are not due solely to changes in subset composition of the memory pool. Importantly, due to enhanced proliferative and metabolic abilities, memory CD8 T cells analyzed late after infection were more protective against a chronic viral infection. Our study shows that the properties of memory CD8 T cells continue to change with time, and that the protective outcome of vaccination may depend on the timing of re-infection relative to the initial immunization.


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Hygiena a epidemiológia Infekčné lekárstvo Laboratórium

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