期刊
PLOS PATHOGENS
卷 12, 期 1, 页码 -出版社
PUBLIC LIBRARY SCIENCE
DOI: 10.1371/journal.ppat.1005380
关键词
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资金
- NIH [R01 AI106725, AI T32 007061]
- UMass GSBS Millennium Program
- Center for AIDS Research [P30 AI 060354]
- NATIONAL INSTITUTE OF ALLERGY AND INFECTIOUS DISEASES [P30AI060354, R01AI106725, T32AI007061] Funding Source: NIH RePORTER
T cell vaccines against Mycobacterium tuberculosis (Mtb) and other pathogens are based on the principle that memory T cells rapidly generate effector responses upon challenge, leading to pathogen clearance. Despite eliciting a robust memory CD8(+) T cell response to the immunodominant Mtb antigen TB10.4 (EsxH), we find the increased frequency of TB10.4-specific CD8(+) T cells conferred by vaccination to be short-lived after Mtb challenge. To compare memory and naive CD8(+) T cell function during their response to Mtb, we track their expansions using TB10.4-specific retrogenic CD8(+) T cells. We find that the primary (naive) response outnumbers the secondary (memory) response during Mtb challenge, an effect moderated by increased TCR affinity. To determine whether the expansion of polyclonal memory T cells is restrained following Mtb challenge, we used TCR beta deep sequencing to track TB10.4-specific CD8(+) T cells after vaccination and subsequent challenge in intact mice. Successful memory T cells, defined by their clonal expansion after Mtb challenge, express similar CDR3 beta sequences suggesting TCR selection by antigen. Thus, both TCR-dependent and -independent factors affect the fitness of memory CD8(+) responses. The impaired expansion of the majority of memory T cell clonotypes may explain why some TB vaccines have not provided better protection.
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