Journal
NATURE REVIEWS IMMUNOLOGY
Volume 17, Issue 6, Pages 376-390Publisher
NATURE PORTFOLIO
DOI: 10.1038/nri.2017.25
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Funding
- US National Institutes of Health [AI116550, AI093589, P30 DK34854]
- Burroughs Wellcome Fund
- Life Sciences Research Foundation
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The receptors of the innate immune system detect specific microbial ligands to promote effective inflammatory and adaptive immune responses. Although this idea is well appreciated, studies in recent years have highlighted the complexity of innate immune detection, with multiple host receptors recognizing the same microbial ligand. Understanding the collective actions of diverse receptors that recognize common microbial signatures represents a new frontier in the study of innate immunity, and is the focus of this Review. Here, we discuss examples of individual bacterial cell wall components that are recognized by at least two and as many as four different receptors of the innate immune system. These receptors survey the extracellular or cytosolic spaces for their cognate ligands and operate in a complementary manner to induce distinct cellular responses. We further highlight that, despite this genetic diversity in receptors and pathways, common features exist to explain the operation of these receptors. These common features may help to provide unifying organizing principles associated with host defence.
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