Kashiwakura JI, Koizumi N, Saitoh K, Kagohashi K, Sasaki Y, Kobayashi F, Kawahara S, Yamauchi Y, Kitai Y, Muromoto R, Oritani K, Matsuda T. Signal-transducing adaptor protein-2 has a nonredundant role for IL-33-triggered mast cell activation.
Biochem Biophys Res Commun 2021;
572:80-5. [PMID:
34358967 DOI:
10.1016/j.bbrc.2021.07.098]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 07/21/2021] [Accepted: 07/29/2021] [Indexed: 11/22/2022]
Abstract
Signal-transducing adaptor protein (STAP)-2 is one of the STAP family adaptor proteins and ubiquitously expressed in a variety types of cells. Although STAP-2 is required for modification of FcεRI signal transduction in mast cells, other involvement of STAP-2 in mast cell functions is unknown, yet. In the present study, we mainly investigated functional roles of STAP-2 in IL-33-induced mast cell activation. In STAP-2-deficient, but not STAP-1-deficient, mast cells, IL-33-induced IL-6 and TNF-α production was significantly decreased compared with that of wild-type mast cells. In addition, STAP-2-deficiency greatly reduced TLR4-mediated mast cell activation and cytokine production. For the mechanisms, STAP-2 directly binds to IKKα after IL-33 stimulation, leading to elevated NF-κB activity. In conclusion, STAP-2, but not STAP-1, participates in IL-33-induced mast cells activation.
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