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Cutting Edge: Primary Innate Immune Cells Respond Efficiently to Polymeric Peptidoglycan, but Not to Peptidoglycan Monomers

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Journal J Immunol
Date 2011 Mar 2
PMID 21357534
Citations 25
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Abstract

The cell wall of bacteria induces proinflammatory cytokines in monocytes and neutrophils in human blood. The nature of the stimulating component of bacterial cell walls is not well understood. We have previously shown polymeric peptidoglycan (PGN) has this activity, and the cytokine response requires PGN internalization and trafficking to lysosomes. In this study, we demonstrate that peptidoglycan monomers such as muramyl dipeptide and soluble peptidoglycan fail to induce robust cytokine production in immune cells, although they activate the nucleotide-binding oligomerization domain proteins in transfected cell models. We further show that lysosomal extracts from immune cells degrade intact peptidoglycan into simpler products and that the lysosomal digestion products activate the nucleotide-binding oligomerization domain proteins. We conclude that naive innate immune cells recognize PGN in its polymeric form rather than monomers such as muramyl dipeptide and require PGN lysosomal hydrolysis to respond. These findings offer new opportunities in the treatment of sepsis, especially sepsis arising from Gram-positive organisms.

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References
1.
Rockel C, Hartung T, Hermann C . Different Staphylococcus aureus whole bacteria mutated in putative pro-inflammatory membrane components have similar cytokine inducing activity. Immunobiology. 2010; 216(3):316-21. DOI: 10.1016/j.imbio.2010.08.001. View

2.
Schleifer K, Kandler O . Peptidoglycan types of bacterial cell walls and their taxonomic implications. Bacteriol Rev. 1972; 36(4):407-77. PMC: 408328. DOI: 10.1128/br.36.4.407-477.1972. View

3.
Girardin S, Boneca I, Carneiro L, Antignac A, Jehanno M, Viala J . Nod1 detects a unique muropeptide from gram-negative bacterial peptidoglycan. Science. 2003; 300(5625):1584-7. DOI: 10.1126/science.1084677. View

4.
Lee J, Tattoli I, Wojtal K, Vavricka S, Philpott D, Girardin S . pH-dependent internalization of muramyl peptides from early endosomes enables Nod1 and Nod2 signaling. J Biol Chem. 2009; 284(35):23818-29. PMC: 2749154. DOI: 10.1074/jbc.M109.033670. View

5.
Coulombe F, Divangahi M, Veyrier F, de Leseleuc L, Gleason J, Yang Y . Increased NOD2-mediated recognition of N-glycolyl muramyl dipeptide. J Exp Med. 2009; 206(8):1709-16. PMC: 2722178. DOI: 10.1084/jem.20081779. View