Cutting Edge: Ezrin Regulates Inflammation by Limiting B Cell IL-10 Production

  • Pore D
  • Matsui K
  • Parameswaran N
  • et al.
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Abstract

IL-10 produced by B cells is important for controlling inflammation, thus underscoring the need to identify mechanisms regulating its production. In this study, we demonstrate that conditional deletion of ezrin in B cells increases IL-10 production induced by TLR4 ligation. The MyD88-independent Toll/IL-1R domain–containing adapter inducing IFN-β–IFN regulatory factor 3 pathway is required for Ezrin-deficient B cells to produce higher IL-10 upon LPS stimulation. Treatment of B cells with a novel small-molecule inhibitor of ezrin induces its dephosphorylation and increases LPS-induced NF-κB and IFN regulatory factor 3 activation and IL-10 secretion, indicating a role for threonine 567 phosphorylation of ezrin in limiting IL-10. Loss of ezrin in B cells results in dampened proinflammatory response to a sublethal dose of LPS in vivo, which is dependent on increased IL-10 production. Taken together, our data yield new insights into molecular and membrane-cytoskeletal regulation of B cell IL-10 production and reveal ezrin as a potential therapeutic target in inflammatory diseases.

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Pore, D., Matsui, K., Parameswaran, N., & Gupta, N. (2016). Cutting Edge: Ezrin Regulates Inflammation by Limiting B Cell IL-10 Production. The Journal of Immunology, 196(2), 558–562. https://doi.org/10.4049/jimmunol.1502098

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