Trib3 is regulated by IL-3 and affects bone marrow-derived mast cell survival and function

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• 作者：Tiit Ö ; rd^a ; Daima Ö ; rd^b ; Sulev Kuuse^a ; Mario Plaas^c ; T&otilde ; nis Ö ; rd^b ; ^tord@ebc.ee
• 关键词：ATF ; activating transcription factor ; BMMCs ; bone marrow-derived mast cells ; BSA ; bovine serum albumin ; C/EBP ; CCAAT/enhancer binding protein ; CHOP ; C/EBP homologous protein ; DAPI ; 4&prime ; 6-diamidino-2-phenylindole ; DNP ; dinitrophenyl ; Epo ; erythropoiet
• 刊名：Cellular Immunology
• 出版年：2012
• 出版时间：November, 2012
• 年：2012
• 卷：280
• 期：1
• 页码：68-75
• 全文大小：547 K

文摘

Mast cells are the principal effectors of IgE-mediated immune responses, including allergic reactions. Tribbles homolog 3 (Trib3) encodes a pseudokinase implicated in the cellular stress response and has been linked to inflammation in certain situations. Here we report the role of Trib3 in mouse bone marrow-derived mast cells (BMMCs). Our results show that Trib3 mRNA expression in BMMCs is positively regulated by the growth factor interleukin (IL)-3. BMMCs originating from Trib3 knockout mice demonstrate unaltered differentiation kinetics and cell surface expression of mast cell markers. When challenged with transient IL-3 deprivation, Trib3-deficient BMMCs display delayed recovery, and during prolonged IL-3 starvation, cell death is accelerated in Trib3-null cultures. IgE-dependent and pharmacologically induced degranulation is impaired in Trib3-deficient BMMCs, as is activation-induced cytokine mRNA expression. Thus, Trib3 contributes to the survival and activity of primary cultured mast cells, which suggests a role for Trib3 in the modulation of the immune response.