Role for nuclear interleukin-37 in the suppression of innate immunity.

Proceedings of the National Academy of Sciences of the United States of America
Suzhao LiCharles A Dinarello

Abstract

The IL-1 family member IL-37 broadly suppresses innate inflammation and acquired immunity. Similar to IL-1α and IL-33, IL-37 is a dual-function cytokine in that IL-37 translocates to the nucleus but also transmits a signal via surface membrane receptors. The role of nuclear IL-37 remains unknown on the ability of this cytokine to inhibit innate inflammation. Here, we compared suppression of innate inflammation in transgenic mice expressing native human IL-37 (IL-37Tg) with those of transgenic mice carrying the mutation of aspartic acid (D) to alanine (A) at amino acid 20 (IL-37D20ATg). The mutation D20A prevents cleavage of caspase-1, a step required for IL-37 nuclear translocation. In vitro, peritoneal macrophages from IL-37Tg mice reduced LPS-induced IL-1β, IL-6, TNFα and IFNγ by 40-50% whereas in macrophages from IL-37D20ATg mice this suppression was not observed, consistent with loss of nuclear function. Compared with macrophages from IL-37Tg mice, significantly less or no suppression of LPS-induced MAP kinase and NFκB activation was also observed in macrophages from IL-37D20ATg mice. In vivo, levels of IL-1β, IL-6, and TNFα in the lungs and liver were markedly reduced during endotoxemia in IL-37Tg mice but not observed in ...Continue Reading

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