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https://www.selleckchem.com/products/BafilomycinA1.html Immune reactions are controlled by the delicate spatiotemporal orchestration of multiple cells communicating by cytokines. Studies of cytokines that began with the discovery of IFN focused on positive regulatory mechanisms that induce secretion in response to harmful stimuli. However, there is a growing awareness that negative regulatory mechanisms that stop secretion of cytokines at specific times and spaces are also important for a successful immune reaction. Type I IFN is the primary cytokine in innate immunity. Although its induction is a prerequisite for the consequent adaptive immune reaction, its oversecretion can cause destructive tissue damage. IFN regulatory factor 7 (IRF7) is a master transcription factor of type I IFN, and multiple observations indicate the key role of IRF7 and the importance of its negative regulation. In this study, we found that the inducible heat shock protein 70 (HSP70) regulated the early type I IFN response by using mice knockout for HSP70. HSP70 dampened IRF7 activation; the inhibitory effect of HSP70 over IKKε-mediated IRF7 activation originated from simple competitive binding. This suggests the possibility of blocking the feed-forward loop between IRF7 and type I IFN in stress environments with increased expression of HSP70. Copyright © 2020 by The American Association of Immunologists, Inc.Nucleotide oligomerization domain-like receptors (NLRs) and RIG-I-like receptors (RLRs) detect diverse pathogen-associated molecular patterns to activate the innate immune response. The role of mammalian NLR NOD1 in sensing bacteria is well established. Although several studies suggest NOD1 also plays a role in sensing viruses, the mechanisms behind this are still largely unknown. In this study, we report on the synergism and antagonism between NOD1 and MDA5 isoforms in teleost. In zebrafish, the overexpression of NOD1 enhances the antiviral response and mRNA abundances of key antiviral

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