Abstract:
:Mucosal associated invariant T (MAIT) cells recognise conserved microbial metabolites from riboflavin synthesis. Striking evolutionary conservation and pulmonary abundance implicate them in antibacterial host defence, yet their functions in protection against clinically important pathogens are unknown. Here we show that mouse Legionella longbeachae infection induces MR1-dependent MAIT cell activation and rapid pulmonary accumulation of MAIT cells associated with immune protection detectable in immunocompetent host animals. MAIT cell protection is more evident in mice lacking CD4+ cells, and adoptive transfer of MAIT cells rescues immunodeficient Rag2-/-γC-/- mice from lethal Legionella infection. Protection is dependent on MR1, IFN-γ and GM-CSF, but not IL-17A, TNF or perforin, and enhanced protection is detected earlier after infection of mice antigen-primed to boost MAIT cell numbers before infection. Our findings define a function for MAIT cells in protection against a major human pathogen and indicate a potential role for vaccination to enhance MAIT cell immunity.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Wang H,D'Souza C,Lim XY,Kostenko L,Pediongco TJ,Eckle SBG,Meehan BS,Shi M,Wang N,Li S,Liu L,Mak JYW,Fairlie DP,Iwakura Y,Gunnersen JM,Stent AW,Godfrey DI,Rossjohn J,Westall GP,Kjer-Nielsen L,Strugnell RA,McCluskdoi
10.1038/s41467-018-05202-8subject
Has Abstractpub_date
2018-08-22 00:00:00pages
3350issue
1issn
2041-1723pii
10.1038/s41467-018-05202-8journal_volume
9pub_type
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