Please use this identifier to cite or link to this item:http://hdl.handle.net/20.500.12105/9709
Leishmania Uses Mincle to Target an Inhibitory ITAM Signaling Pathway in Dendritic Cells that Dampens Adaptive Immunity to Infection
Iborra, Salvador CNIC | Martinez-Lopez, Maria CNIC | Cueto, Francisco J. CNIC | Conde-Garrosa, Ruth CNIC | del Fresno, Carlos CNIC | Izquierdo-Fernandez, Helena María CNIC | Abram, Clare L | Mori, Daiki | Campos-Martín, Yolanda | Reguera, Rosa María | Kemp, Benjamin | Yamasaki, Sho | Robinson, Matthew J | Soto, Manuel | Lowell, Clifford A | Sancho, David CNIC
Immunity. 2016; 45(4):788-801
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 FcRγ 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.
Adaptive Immunity | Animals | CD11c Antigen | Cell Differentiation | Cell Line, Tumor | Dendritic Cells | Immunoreceptor Tyrosine-Based Activation Motif | Lectins, C-Type | Leishmania major | Membrane Proteins | Mice | Mice, Inbred C57BL | Mice, Transgenic | Protein Tyrosine Phosphatase, Non-Receptor Type 6 | Receptors, Fc | Signal Transduction
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