Journal
IMMUNITY
Volume 45, Issue 4, Pages 788-801Publisher
CELL PRESS
DOI: 10.1016/j.immuni.2016.09.012
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Funding
- CNIC
- Spanish Ministry of Economy and Competitiveness (MINECO) [SAF-2013-42920R]
- European Commission [635122-PROCROP H2020]
- European Research Council [ERC-2010-StG 260414]
- MINECO
- Pro-CNIC Foundation
- Severo Ochoa Center of Excellence (MINECO award) [SEV-2015-0505]
- [SAF2015-74561-JIN]
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C-type lectin receptors sense a diversity of endogenous and exogenous ligands that may trigger differential responses. Here, we have found that human and mouse Mincle bind to a ligand released by Leishmania, a eukaryote parasite that evades an effective immune response. Mincle-deficient mice had milder dermal pathology and a tenth of the parasite burden compared to wild-type mice after Leishmania major intradermal ear infection. Mincle deficiency enhanced adaptive immunity against the parasite, correlating with increased activation, migration, and priming by Mincle-deficient dendritic cells ( DCs). Leishmania triggered a Mincle-dependent inhibitory axis characterized by SHP1 coupling to the FcRg chain. Selective loss of SHP1 in CD11c(+) cells phenocopies enhanced adaptive immunity to Leishmania. In conclusion, Leishmania shifts Mincle to an inhibitory ITAM ( ITAMi) configuration that impairs DC activation. Thus, ITAMi can be exploited for immune evasion by a pathogen and may represent a paradigm for ITAM-coupled receptors sensing self and non-self.
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