Journal
JOURNAL OF IMMUNOLOGY
Volume 177, Issue 4, Pages 2051-2055Publisher
AMER ASSOC IMMUNOLOGISTS
DOI: 10.4049/jimmunol.177.4.2051
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Funding
- NCI NIH HHS [CA 87922] Funding Source: Medline
- NIAID NIH HHS [AI 068129] Funding Source: Medline
- NIAMS NIH HHS [R01 AR050038, AR 050038] Funding Source: Medline
- BLRD VA [I01 BX000615] Funding Source: Medline
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DAP12 is an ITAM-containing adapter that associates with receptors in myeloid and NK cells. DAP12-associated receptors can give activation signals leading to cytokine production; however, in some situations, DAP12 inhibits cytokine production stimulated through TLRs and FcRs. Here we show that Triggering Receptor Expressed on Myeloid cells (TREM)-2 is responsible for the DAP12-mediated inhibition in mouse macrophages. A chimeric receptor composed of the extracellular domain of TREM-2 and the cytoplasmic domain of DAP12 inhibited the TLR- and TcR-induced TNF production of DAP12-deficient macrophages, whereas a TREM-1 chimera did not. In wild-type macrophages, TREM-2 knockdown increased TLR-induced TNF production. A TREM-2 Fc fusion protein bound to macrophages, indicating that macrophages express a TREM-2 ligand, Thus, the interaction of TREM-2 and its ligand results in an inhibitory signal that can reduce the inflammatory response.
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