Abstract
CD8+ T cells confer host protection through T-cell-receptor (TCR)-mediated recognition of foreign antigens presented by infected cells. Thus, generation of CD8+ T cell populations with high antigen sensitivity is critical for efficient pathogen clearance. Besides selection of high-affinity TCRs, the molecular mechanisms regulating the antigen sensitivity of CD8+ T cells remain poorly defined. Herein, we have demonstrated that the antigen sensitivity of effector and memory CD8+ T cells is dynamically regulated and can be tuned by pathogen-induced inflammatory milieux independently of the selection of cells with higher TCR affinity. Mechanistically, we have demonstrated that the signal-transduction capacity of key TCR proximal molecules is enhanced by inflammatory cytokines, which reduced the antigen density required to trigger antimicrobial functions. Dynamic tuning of CD8+ T cell antigen sensitivity by inflammatory cytokines most likely optimizes immunity to specific pathogens while minimizing the risk of immunopathology at steady state.
Original language | English (US) |
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Pages (from-to) | 140-152 |
Number of pages | 13 |
Journal | Immunity |
Volume | 38 |
Issue number | 1 |
DOIs | |
State | Published - Jan 24 2013 |
Externally published | Yes |
ASJC Scopus subject areas
- Immunology and Allergy
- Immunology
- Infectious Diseases