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      Comprehensive network map of transcriptional activation of chicken type I IFNs and IFN-stimulated genes

      , , ,
      Comparative Immunology, Microbiology and Infectious Diseases
      Elsevier BV

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          The role of pattern-recognition receptors in innate immunity: update on Toll-like receptors.

          The discovery of Toll-like receptors (TLRs) as components that recognize conserved structures in pathogens has greatly advanced understanding of how the body senses pathogen invasion, triggers innate immune responses and primes antigen-specific adaptive immunity. Although TLRs are critical for host defense, it has become apparent that loss of negative regulation of TLR signaling, as well as recognition of self molecules by TLRs, are strongly associated with the pathogenesis of inflammatory and autoimmune diseases. Furthermore, it is now clear that the interaction between TLRs and recently identified cytosolic innate immune sensors is crucial for mounting effective immune responses. Here we describe the recent advances that have been made by research into the role of TLR biology in host defense and disease.
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            STING an Endoplasmic Reticulum Adaptor that Facilitates Innate Immune Signaling

            We report here the identification, following expression cloning, of a molecule, STING (STimulator of INterferon Genes) that regulates innate immune signaling processes. STING, comprising 5 putative transmembrane (TM) regions, predominantly resides in the endoplasmic reticulum (ER) and is able to activate both NF-κB and IRF3 transcription pathways to induce type I IFN and exert a potent anti-viral state following expression. In contrast, loss of STING rendered murine embryonic fibroblasts (STING −/−MEFs) extremely susceptible to negative-stranded virus infection, including vesicular stomatitis virus, VSV. Further, STING ablation abrogated the ability of intracellular B-form DNA, as well as members of the herpes virus family, to induce IFNβ, but did not significantly affect the Toll-like receptor (TLR pathway). Yeast-two hybrid and co-immunprecipitation studies indicated that STING interacts with RIG-I and with Ssr2/TRAPβ, a member of the translocon-associated protein (TRAP) complex required for protein translocation across the ER membrane following translation[1, 2]. RNAi ablation of TRAPβ and translocon adaptor Sec61β was subsequently found to inhibit STING’s ability to stimulate IFNβ. Thus, aside from identifying a novel regulator of innate immune signaling, this data implicates for the first time a potential role for the translocon in innate signaling pathways activated by select viruses as well as intracellular DNA.
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              Interferon-stimulated genes: a complex web of host defenses.

              Interferon-stimulated gene (ISG) products take on a number of diverse roles. Collectively, they are highly effective at resisting and controlling pathogens. In this review, we begin by introducing interferon (IFN) and the JAK-STAT signaling pathway to highlight features that impact ISG production. Next, we describe ways in which ISGs both enhance innate pathogen-sensing capabilities and negatively regulate signaling through the JAK-STAT pathway. Several ISGs that directly inhibit virus infection are described with an emphasis on those that impact early and late stages of the virus life cycle. Finally, we describe ongoing efforts to identify and characterize antiviral ISGs, and we provide a forward-looking perspective on the ISG landscape.
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                Author and article information

                Journal
                Comparative Immunology, Microbiology and Infectious Diseases
                Comparative Immunology, Microbiology and Infectious Diseases
                Elsevier BV
                01479571
                February 2020
                February 2020
                : 68
                : 101407
                Article
                10.1016/j.cimid.2019.101407
                a6f4c67a-893d-4efe-a099-8dc6da81b6c7
                © 2020

                https://www.elsevier.com/tdm/userlicense/1.0/

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