[No authors listed]
The pyrin and HIN-domain (PYHIN) family member1 (pyhin1) is a member of PYHIN proteins and involved in transcriptional regulation of genes important for cell cycle control, differentiation and apoptosis. The regulatory action of mouse pyhin1 on LPS-induced inflammatory response was examined. LPS augmented the pyhin1 mRNA expression in murine RAW 264.7 macrophage cells and peritoneal macrophages. The augmentation of pyhin1 mRNA expression was abolished by parthenolide, a NF-κB inhibitor. Silencing of pyhin1 with small interfering RNA reduced the production of IFN-β and NO. However, pyhin1 silencing did not affect the production of TNF-α, IL-6, IL-10 and prostaglandin E2. Reduced IFN-β production by pyhin1 silencing caused inactivation of and reduced expression of IRF1. Pyhin1 silencing inhibited the expression of TRAF6, TBK1 and TRIF, which trigger IFN-β production in the MyD88-independent pathway. However, pyhin1 silencing did not affect the expression of MyD88, IRAK4 and several mitogen-activated protein kinases in the MyD88-dependent pathway. Taken together, mouse pyhin1 was suggested to be a NF-κB-responsible gene in response to LPS and positively regulate LPS-induced IFN-β and NO production through up-regulating the MyD88-independent signaling pathway.
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