SR-A, MARCO and TLRs Differentially Recognise Selected Surface Proteins from Neisseria meningitidis: an Example of Fine Specificity in Microbial Ligand Recognition by Innate Immune Receptors
Macrophages express various classes of pattern recognition receptors involved in innate immune recognition of artificial, microbial and host-derived ligands. These include the scavenger receptors (SRs), which are important for phagocytosis, and the Toll-like receptors (TLRs) involved in microbe sens...
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Published in: | Journal of innate immunity Vol. 1; no. 2; pp. 153 - 163 |
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Main Authors: | , , , , , , , |
Format: | Journal Article |
Language: | English |
Published: |
Basel, Switzerland
S. Karger AG
01-01-2009
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Subjects: | |
Online Access: | Get full text |
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Summary: | Macrophages express various classes of pattern recognition receptors involved in innate immune recognition of artificial, microbial and host-derived ligands. These include the scavenger receptors (SRs), which are important for phagocytosis, and the Toll-like receptors (TLRs) involved in microbe sensing. The class A macrophage scavenger receptor (SR-A) and macrophage receptor with a collagenous structure (MARCO) display similar domain structures and ligand-binding specificity, which has led to the assumption that these two receptors may be functionally redundant. In this study we show that SR-A and MARCO differentially recognise artificial polyanionic ligands as well as surface proteins from the pathogenic bacterium Neisseria meningitidis. We show that, while acetylated low-density lipoprotein (AcLDL) is a strong ligand for SR-A, it is not a ligand for MARCO. Of the neisserial proteins that were SR ligands, some were ligands for both receptors, while other proteins were only recognised by either SR-A or MARCO. We also analysed the potential of these ligands to act as TLR agonists and assessed the requirement for SR-A and MARCO in pro-inflammatory cytokine induction. SR ligation alone did not induce cytokine production; however, for proteins that were both SR and TLR ligands, the SRs were required for full activation of TLR pathways. |
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Bibliography: | ObjectType-Article-2 SourceType-Scholarly Journals-1 ObjectType-Feature-1 content type line 23 ObjectType-Article-1 ObjectType-Feature-2 Annette Plüddemann and Subhankar Mukhopadhyay contributed equally to this study. |
ISSN: | 1662-811X 1662-8128 1662-8128 |
DOI: | 10.1159/000155227 |