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IL-33 causes selective mast cell tolerance to bacterial cell wall products by inducing IRAK1 degradation.

Abstract：

:Mast cells are important cellular constituents of epithelial-mesenchymal interactions, densely located at sites of microbial entry into the host where they are continuously exposed to products from commensals. In order to avoid excessive activation and the associated pathology, mast cell responses to TLR agonists must be tightly regulated. Here, we show that exposure in vitro to subactivating levels of the epithelial cell product, IL-33, renders mast cells insensitive to bacterial cell wall products. Mast cell responsiveness to Ag, cytoplasmic dsDNA, and TLR7/8 agonists is unaffected or enhanced by IL-33. The IL-33-induced mast cell selective tolerance requires the IL-33 receptor ST2 and peritoneal mast cells from St2(-/-) mice display a constitutively activated phenotype, demonstrated by increased expression of activation markers including CD11b and CD28. IL-33 exposure neither affects the levels of TLR4, MyD88, TIRAP, IL-1R associated kinase 2 (IRAK2), or IRAK4, nor induces persistent A20 or Tollip expression, but potently causes ST2-dependent IRAK1 degradation. We show that while IRAK2 is redundant for TLR4 signaling, IRAK1 is essential for TLR4 signaling in mast cells. We suggest that IL-33 produced during homeostasis retains mast cells in an unresponsive state to bacterial cell wall products via IRAK1 degradation, thus preventing chronic inflammation and tissue destruction.

journal_name

Eur J Immunol

journal_title

European journal of immunology

authors

Sandig H,Jobbings CE,Roldan NG,Whittingham-Dowd JK,Orinska Z,Takeuchi O,Akira S,Bulfone-Paus S

doi

10.1002/eji.201242786

subject

Has Abstract

pub_date

2013-04-01 00:00:00

pages

979-88

issue

4

eissn

0014-2980

issn

1521-4141

journal_volume

43

pub_type

杂志文章

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