MAIT cells protect against pulmonary Legionella longbeachae infection

Huimeng Wang, Criselle D’Souza, Xin Yi Lim, Lyudmila Kostenko, Troi J. Pediongco, Sidonia B.G. Eckle, Bronwyn S. Meehan, Mai Shi, Nancy Wang, Shihan Li, Ligong Liu, Jeffrey Y.W. Mak, David P. Fairlie, Yoichiro Iwakura, Jennifer M. Gunnersen, Andrew W. Stent, Dale I. Godfrey, Jamie Rossjohn, Glen P. Westall, Lars Kjer-NielsenRichard A. Strugnell, James McCluskey, Alexandra J. Corbett, Timothy S.C. Hinks, Zhenjun Chen

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146 Citations (Scopus)


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 Legionellalongbeachae 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.

Original languageEnglish
Article number3350
Number of pages15
JournalNature Communications
Issue number1
Publication statusPublished - 1 Dec 2018

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