TARM1 Is a Novel Leukocyte Receptor Complex–Encoded ITAM Receptor That Costimulates Proinflammatory Cytokine Secretion by Macrophages and Neutrophils


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Article
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Authors
Radjabova, Valeria 
Mastroeni, Piero 
Skjødt, Karsten 
Zaccone, Paola 
de Bono, Bernard 
Abstract

We identified a novel, evolutionarily conserved receptor encoded within the human leukocyte receptor complex and syntenic region of mouse chromosome 7, named T cell–interacting, activating receptor on myeloid cells-1 (TARM1). The transmembrane region of TARM1 contained a conserved arginine residue, consistent with association with a signaling adaptor. TARM1 associated with the ITAM adaptor FcRγ but not with DAP10 or DAP12. In healthy mice, TARM1 is constitutively expressed on the cell surface of mature and immature CD11b+Gr-1+ neutrophils within the bone marrow. Following i.p. LPS treatment or systemic bacterial challenge, TARM1 expression was upregulated by neutrophils and inflammatory monocytes and TARM1+ cells were rapidly recruited to sites of inflammation. TARM1 expression was also upregulated by bone marrow–derived macrophages and dendritic cells following stimulation with TLR agonists in vitro. Ligation of TARM1 receptor in the presence of TLR ligands, such as LPS, enhanced the secretion of proinflammatory cytokines by macrophages and primary mouse neutrophils, whereas TARM1 stimulation alone had no effect. Finally, an immobilized TARM1-Fc fusion protein suppressed CD4+ T cell activation and proliferation in vitro. These results suggest that a putative T cell ligand can interact with TARM1 receptor, resulting in bidirectional signaling and raising the T cell activation threshold while costimulating the release of proinflammatory cytokines by macrophages and neutrophils.

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Journal Title
The Journal of Immunology
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Volume Title
195
Publisher
American Association of Immunologists
Sponsorship
This work was supported by grants from the Cancer Research UK, the Wellcome Trust, the Medical Research Council UK, and by a Marie Curie International Outgoing Fellowship awarded to A.D.B. with additional support from the Wellcome Trust and the National Institute for Health Research Cambridge Biomedical Research Centre.