目的研究解旋酶DDX41在人牙髓组织和细胞中的表达,为深入探讨其在龋病及牙髓病天然免疫应答过程中的作用奠定基础。方法应用逆转录-聚合酶链反应(RT-PCR)、免疫细胞化学和免疫组织化学技术对人牙髓组织和牙髓细胞中DDX41的表达和定位进...目的研究解旋酶DDX41在人牙髓组织和细胞中的表达,为深入探讨其在龋病及牙髓病天然免疫应答过程中的作用奠定基础。方法应用逆转录-聚合酶链反应(RT-PCR)、免疫细胞化学和免疫组织化学技术对人牙髓组织和牙髓细胞中DDX41的表达和定位进行分析。结果 RT-PCR结果显示DDX41 m RNA在人牙髓细胞中有显著表达;免疫细胞化学和免疫组织化学染色结果显示DDX41在牙髓细胞的胞浆和胞核中皆有表达,但胞核中的表达水平较低;在牙髓组织中,DDX41主要在牙髓组织表面的成牙本质细胞的胞浆和胞核中皆有表达。结论人牙髓组织中的成牙本质细胞作为牙髓免疫的效应细胞之一,在龋病和牙髓炎的免疫反应过程中,细胞内可能存在DDX41/STING依赖的TBK1-IRF3-IFN-β信号通路的活化。展开更多
RNA helicases are involved in almost every aspect of RNA, from transcription to RNA decay. DExD/H-box hell- cases compdse the largest SF2 helicase superfamily, which are characterized by two conserved RecA-like domain...RNA helicases are involved in almost every aspect of RNA, from transcription to RNA decay. DExD/H-box hell- cases compdse the largest SF2 helicase superfamily, which are characterized by two conserved RecA-like domains. In recent years, an increasing number of unexpected functions of these proteins have been discovered. They play important roles not only in innate immune response but also in diseases like cancers and chronic hepatitis C. In this review, we summarize the recant literatures on one member of the SF2 superfamily, the DEAD- box protein DDX41. After bacterial or viral infection, DNA or cyclic-di-GMP is released to cells. After phosphorylation of Tyr414 by BTK kinase, DDX41 will act as a sensor to recognize the invaders, followed by induction of type I interferons （IFN）. After the immune response, DDX41 is degraded by the E3 ligase TRIM21, using Lys9 and Lys115 of DDX41 as the ubiquitination sites. Besides the roles in Innate immunity, DDX41 is also related to diseases. An increasing number of both inherited and acquired mutetions in DDX41 gane are identified from myelodysplastic syndrome and/or acute myeloid leukemia （MDS/AML） patients. The review focuses on DDX41, as well as its homolog Abstrakt in Drosophila, which is important for survlval at all stages throughout the life cycle of the fly.展开更多
文摘目的研究解旋酶DDX41在人牙髓组织和细胞中的表达,为深入探讨其在龋病及牙髓病天然免疫应答过程中的作用奠定基础。方法应用逆转录-聚合酶链反应(RT-PCR)、免疫细胞化学和免疫组织化学技术对人牙髓组织和牙髓细胞中DDX41的表达和定位进行分析。结果 RT-PCR结果显示DDX41 m RNA在人牙髓细胞中有显著表达;免疫细胞化学和免疫组织化学染色结果显示DDX41在牙髓细胞的胞浆和胞核中皆有表达,但胞核中的表达水平较低;在牙髓组织中,DDX41主要在牙髓组织表面的成牙本质细胞的胞浆和胞核中皆有表达。结论人牙髓组织中的成牙本质细胞作为牙髓免疫的效应细胞之一,在龋病和牙髓炎的免疫反应过程中,细胞内可能存在DDX41/STING依赖的TBK1-IRF3-IFN-β信号通路的活化。
基金ACKNOWLEDGMENTS This work was supported by the National Basic Research Program （973 Program） （No. 2014CB910400 and 2013CB911103）, the National Natural Science Foundation of China （Grants No. 31570875, 31330019, 81590761, 31560727 and 81501353）, the Beijing Nova Program （Grant No. Z141102001814020） to S.O., Youth Innovation Promotion Association CAS （Grant No. 2013065） to S.O., and the special project of Ebola virus research from the president foundation of Chinese Academy of Sciences.
文摘RNA helicases are involved in almost every aspect of RNA, from transcription to RNA decay. DExD/H-box hell- cases compdse the largest SF2 helicase superfamily, which are characterized by two conserved RecA-like domains. In recent years, an increasing number of unexpected functions of these proteins have been discovered. They play important roles not only in innate immune response but also in diseases like cancers and chronic hepatitis C. In this review, we summarize the recant literatures on one member of the SF2 superfamily, the DEAD- box protein DDX41. After bacterial or viral infection, DNA or cyclic-di-GMP is released to cells. After phosphorylation of Tyr414 by BTK kinase, DDX41 will act as a sensor to recognize the invaders, followed by induction of type I interferons （IFN）. After the immune response, DDX41 is degraded by the E3 ligase TRIM21, using Lys9 and Lys115 of DDX41 as the ubiquitination sites. Besides the roles in Innate immunity, DDX41 is also related to diseases. An increasing number of both inherited and acquired mutetions in DDX41 gane are identified from myelodysplastic syndrome and/or acute myeloid leukemia （MDS/AML） patients. The review focuses on DDX41, as well as its homolog Abstrakt in Drosophila, which is important for survlval at all stages throughout the life cycle of the fly.
