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Inhibition of FcεRI-mediated mast cell responses by ES-62, a product of parasitic filarial nematodes

Abstract

Atopic allergy is characterized by an increase in IgE antibodies that signal through the high-affinity Fcε receptor (FcεRI) to induce the release of inflammatory mediators from mast cells. For unknown reasons, the prevalence of allergic diseases has recently increased steeply in the developed world1. However, this increase has not been mirrored in developing countries2, even though IgE concentrations are often greatly elevated in individuals from these countries, owing to nonspecific IgE induction by universally present parasitic worms3. Here we offer one explanation for this paradox based on the properties of ES-62, a molecule secreted by filarial nematodes4. We found that highly purified, endotoxin-free ES-62 directly inhibits the FcεRI-induced release of allergy mediators from human mast cells by selectively blocking key signal transduction events, including phospholipase D–coupled, sphingosine kinase–mediated calcium mobilization and nuclear factor-κB activation. ES-62 mediates these effects by forming a complex with Toll-like receptor 4, which results in the sequestration of protein kinase C-α (PKC-α). This causes caveolae/lipid raft–mediated, proteasome-independent degradation of PKC-α, a molecule important for the coupling of FcεRI to phospholipase D and mast cell activation. We also show that ES-62 is able to protect mice from mast cell–dependent hypersensitivity in the skin and lungs, indicating that it has potential as a novel therapeutic for allergy.

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Figure 1: ES-62 inhibition of FcεRI-mediated Ca2+ mobilization and degranulation of human BMMC correlates with downregulation of PKC-α expression.
Figure 2: ES-62–mediated inhibition of proinflammatory mediator production from BMMCs correlates with decreased NF-κB activity, and TLR4 antisense oligonucleotides prevent ES-62 modulation of mast cell function.
Figure 3: ES-62 forms a complex with TLR4 and PKC-α and is internalized into vesicular compartments.
Figure 4: In vivo exposure to ES-62 inhibits mouse mast-cell activity ex vivo and protects against immediate hypersensitivity.

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Acknowledgements

This work was supported by grants from the YonH Loo Lin School of Medicine, the National University of Singapore (A.J.M.) and the Wellcome Trust (W.H. and M.M.H.).

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Correspondence to William Harnett.

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Supplementary Methods and References, Supplementary Figs. 1–5 (PDF 4104 kb)

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Melendez, A., Harnett, M., Pushparaj, P. et al. Inhibition of FcεRI-mediated mast cell responses by ES-62, a product of parasitic filarial nematodes. Nat Med 13, 1375–1381 (2007). https://doi.org/10.1038/nm1654

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