Journal
PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA
Volume 115, Issue 45, Pages E10662-E10671Publisher
NATL ACAD SCIENCES
DOI: 10.1073/pnas.1809100115
Keywords
innate immunity; bacterial infection; C-type lectin receptors; glycolipids; adjuvant
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Funding
- Japan Society for the Promotion of Science (JSPS) KAKENHI [JP26293099, JP26110009, JP16K09952]
- Japan Agency for Medical Research and Development (AMED) [JP17gm0910010, JP17ak0101070, JP18fk0108075, JP18fk0108044]
- Netherlands Organization for Scientific Research [91713303]
- National Health and Medical Research Council (NHMRC) [APP1041294, APP1057846]
- Australian Research Council [SRI110001002]
- Takeda Science Foundation
- Niedersachsen-Research Network on Neuroinfectiology
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Group A Streptococcus (GAS) is a Gram-positive bacterial pathogen that causes a range of diseases, including fatal invasive infections. However, the mechanisms by which the innate immune system recognizes GAS are not well understood. We herein report that the C-type lectin receptor macrophage inducible C-type lectin (Mincle) recognizes GAS and initiates antibacterial immunity. Gene expression analysis of myeloid cells upon GAS stimulation revealed the contribution of the caspase recruitment domain-containing protein 9 (CARD9) pathway to the antibacterial responses. Among receptors signaling through CARD9, Mincle induced the production of inflammatory cytokines, inducible nitric oxide synthase, and reactive oxygen species upon recognition of the anchor of lipoteichoic acid, monoglucosyldiacylglycerol (MGDG), produced by GAS. Upon GAS infection, Mincle-deficient mice exhibited impaired production of proinflammatory cytokines, severe bacteremia, and rapid lethality. GAS also possesses another Mincle ligand, diglucosyldiacylglycerol; however, this glycolipid interfered with MGDG-induced activation. These results indicate that Mincle plays a central role in protective immunity against acute GAS infection.
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