CD4+ T help promotes influenza virus-specific CD8+ T cell memory by limiting metabolic dysfunction

Proceedings of the National Academy of Sciences of the United States of America
Jolie G CullenStephen J Turner

Abstract

There is continued interest in developing novel vaccine strategies that induce establish optimal CD8+ cytotoxic T lymphocyte (CTL) memory for pathogens like the influenza A viruses (IAVs), where the recall of IAV-specific T cell immunity is able to protect against serologically distinct IAV infection. While it is well established that CD4+ T cell help is required for optimal CTL responses and the establishment of memory, when and how CD4+ T cell help contributes to determining the ideal memory phenotype remains unclear. We assessed the quality of IAV-specific CD8+ T cell memory established in the presence or absence of a concurrent CD4+ T cell response. We demonstrate that CD4+ T cell help appears to be required at the initial priming phase of infection for the maintenance of IAV-specific CTL memory, with "unhelped" memory CTL exhibiting intrinsic dysfunction. High-throughput RNA-sequencing established that distinct transcriptional signatures characterize the helped vs. unhelped IAV-specific memory CTL phenotype, with the unhelped set showing a more "exhausted T cell" transcriptional profile. Moreover, we identify that unhelped memory CTLs exhibit defects in a variety of energetic pathways, leading to diminished spare respirato...Continue Reading

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