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Title 

IL-32 synergizes with nucleotide oligomerization domain (NOD) 1 and NOD2 ligands for IL-1β and IL-6 production through a caspase 1-dependent mechanism

Authors 

M G NeteaT AzamG FerwerdaS E GirardinM WalshJ S ParkE AbrahamJ M KimDo Young YoonC A DinarelloS H Kim

Publisher 

National Academy of Sciences

Issue Date 

2005

Citation 

Proceedings of the National Academy of Sciences of the United States of America, vol. 102, no. 45, pp. 16309-16314

Keywords 

cytokinestoll-like receptorscaspase inhibitorcaspase recruitment domain protein 15cell surface receptorgludapcininterleukin 1betainterleukin 1beta converting enzymeinterleukin 6ligand

Abstract 

The activation of innate immunity requires the amplification of signals induced by pattern-recognition receptors for bacterial products. We have investigated the role of the newly described cytokine IL-32 in the amplification of cytokine production induced by the two most clinically relevant families of microbial receptors, the cell-surface Toll-like receptors (TLRs) and the intracellular nuclear oligomerization domain (NOD) receptor family. IL-32 synergized with the NOD1- and NOD2-specific muropeptides of peptidoglycans for the release of IL-1β and IL-6 (a 3- to 10-fold increase). In contrast, IL-32 did not influence the cytokine production induced via TLRs. The synergistic effect of IL-32 and synthetic muramyl dipeptide (MDP) on cytokine production was absent in the cells of patients with Crohn's disease bearing the NOD2 frameshift mutation 3020insC, demonstrating that the IL-32/MDP synergism depends on NOD2. This in vitro synergism between IL-32 and NOD2 ligands was consistent with a marked constitutive expression of IL-32 in human colon epithelial tissue. In addition, the potentiating effect of IL-32 on the cytokine production induced by the synthetic muropeptide FK-156 was absent in NOD1-deficient macrophages, supporting the interaction between IL-32 and NOD1 pathways. When specific caspase inhibitors were used, the synergism between IL-32 and MDP/NOD2 depended on the activation of caspase 1. Only additive effects of IL-32 and muropeptides were observed for TNF-α production. The modulation of intracellular NOD2 pathways by IL-32, but not cell-surface TLRs, and the marked expression of IL-32 in colon mucosa suggest a role of IL-32 in the pathogenesis of Crohn's disease.

ISSN 

0027-8424

Link 

http://dx.doi.org/10.1073/pnas.0508237102

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2019-05-02


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