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Enhanced Toll-like receptor responses in the absence of signaling adaptor DAP12. - eScholarship
Jessica A. Hamerman,Nadia K. Tchao,Clifford A. Lowell,Lewis L. Lanier +3 more
- Vol. 6, Iss: 6, pp 579-586
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TLDR
This article examined the responses of mice lacking DAP12 to stimulation through Toll-like receptors (TLRs) and found that one or more DAP-pairing receptors negatively regulate signaling through TLRs.Abstract:
DAP12 is a signaling adaptor containing an immunoreceptor tyrosine-based activation motif (ITAM) that pairs with receptors on myeloid cells and natural killer cells. We examine here the responses of mice lacking DAP12 to stimulation through Toll-like receptors (TLRs). Unexpectedly, DAP12-deficient macrophages produced higher concentrations of inflammatory cytokines in response to a variety of pathogenic stimuli. Additionally, macrophages deficient in spleen tyrosine kinase (Syk), which signals downstream of DAP12, showed a phenotype identical to that of DAP12-deficient macrophages. DAP12-deficient mice were more susceptible to endotoxic shock and had enhanced resistance to infection by the intracellular bacterium Listeria monocytogenes. These data suggest that one or more DAP12-pairing receptors negatively regulate signaling through TLRs.read more
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Syk Facilitates Influenza A Virus Replication by Restraining Innate Immunity at the Late Stage of Viral Infection
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References
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TL;DR: The role of the IgA-FcαRI interaction in the activation of different signaling pathways and its multifaceted role in immunity are discussed.
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Dectin-1 Regulates Hepatic Fibrosis and Hepatocarcinogenesis by Suppressing TLR4 Signaling Pathways
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