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J Virol. 2019 Aug 28. pii: JVI.01073-19. doi: 10.1128/JVI.01073-19. [Epub ahead of print]
Disruption of type III interferon genes Ifnl2 and Ifnl3 recapitulates loss of the type III IFN receptor in the mucosal antiviral response.
Peterson ST1,2, Kennedy EA1,2, Brigleb PH3,4, Taylor GM5,4, Urbanek K5,4, Bricker TL1, Lee S1,2, Shin H1, Dermody TS3,5,4, Boon ACM1, Baldridge MT6,2.
Author information
1 Department of Medicine, Division of Infectious Diseases, Washington University School of Medicine, St. Louis, MO, USA. 2 Edison Family Center for Genome Sciences & Systems Biology, Washington University School of Medicine, St. Louis, MO, USA. 3 Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. 4 Center for Microbial Pathogenesis, UPMC Children's Hospital of Pittsburgh, Pittsburgh, PA, USA. 5 Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. 6 Department of Medicine, Division of Infectious Diseases, Washington University School of Medicine, St. Louis, MO, USA. mbaldridge@wustl.edu.
Abstract
Type III interferon (IFN), or IFN-λ, is an essential component of the innate immune response to mucosal viral infections. Both in the intestine and the lung, signaling via the IFN-λ receptor, IFNLR, controls clinically important viral pathogens including influenza virus, norovirus, and rotavirus. While it is thought that IFN-λ cytokines are the exclusive ligands for signaling through IFNLR, it is not known whether genetic ablation of these cytokines phenotypically recapitulates disruption of the receptor. Here, we report the serendipitous establishment of Ifnl2-/-Ifnl3-/- mice, which lack all known functional murine IFN-λ cytokines. We demonstrate that, like Ifnlr1-/- mice lacking IFNLR signaling, these mice display defective control of murine norovirus, reovirus, and influenza virus, and therefore genocopy Ifnlr1-/- mice. Thus, for regulation of viral infections at mucosal sites of both the intestine and lung, signaling via IFNLR can be fully explained by the activity of known cytokines IFN-λ2 and IFN-λ3. Our results confirm the current understanding of ligand-receptor interactions for type III IFN signaling and highlight the importance of this pathway in regulation of mucosal viral pathogens.ImportanceType III interferons are potent antiviral cytokines important for regulation of viruses that infect at mucosal surfaces. Studies using mice lacking the type III interferon receptor, Ifnlr1, have demonstrated that signaling through this receptor is critical for protection against influenza virus, norovirus, and reovirus. Using a genetic approach to disrupt murine type III interferon cytokine genes Ifnl2 and Ifnl3, we found that mice lacking these cytokines fully recapitulate the impaired control of viruses observed in mice lacking Ifnlr1 Our results support an exclusive role for known type III interferon cytokines in signaling via IFNLR to mediate antiviral effects at mucosal surfaces. These findings emphasize the importance of type III interferons in regulation of a variety of viral pathogens and provide important genetic evidence to support our understanding of the ligand-receptor interactions in this pathway.
Copyright ? 2019 American Society for Microbiology.
PMID: 31462571 DOI: 10.1128/JVI.01073-19
Disruption of type III interferon genes Ifnl2 and Ifnl3 recapitulates loss of the type III IFN receptor in the mucosal antiviral response.
Peterson ST1,2, Kennedy EA1,2, Brigleb PH3,4, Taylor GM5,4, Urbanek K5,4, Bricker TL1, Lee S1,2, Shin H1, Dermody TS3,5,4, Boon ACM1, Baldridge MT6,2.
Author information
1 Department of Medicine, Division of Infectious Diseases, Washington University School of Medicine, St. Louis, MO, USA. 2 Edison Family Center for Genome Sciences & Systems Biology, Washington University School of Medicine, St. Louis, MO, USA. 3 Department of Microbiology and Molecular Genetics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. 4 Center for Microbial Pathogenesis, UPMC Children's Hospital of Pittsburgh, Pittsburgh, PA, USA. 5 Department of Pediatrics, University of Pittsburgh School of Medicine, Pittsburgh, PA, USA. 6 Department of Medicine, Division of Infectious Diseases, Washington University School of Medicine, St. Louis, MO, USA. mbaldridge@wustl.edu.
Abstract
Type III interferon (IFN), or IFN-λ, is an essential component of the innate immune response to mucosal viral infections. Both in the intestine and the lung, signaling via the IFN-λ receptor, IFNLR, controls clinically important viral pathogens including influenza virus, norovirus, and rotavirus. While it is thought that IFN-λ cytokines are the exclusive ligands for signaling through IFNLR, it is not known whether genetic ablation of these cytokines phenotypically recapitulates disruption of the receptor. Here, we report the serendipitous establishment of Ifnl2-/-Ifnl3-/- mice, which lack all known functional murine IFN-λ cytokines. We demonstrate that, like Ifnlr1-/- mice lacking IFNLR signaling, these mice display defective control of murine norovirus, reovirus, and influenza virus, and therefore genocopy Ifnlr1-/- mice. Thus, for regulation of viral infections at mucosal sites of both the intestine and lung, signaling via IFNLR can be fully explained by the activity of known cytokines IFN-λ2 and IFN-λ3. Our results confirm the current understanding of ligand-receptor interactions for type III IFN signaling and highlight the importance of this pathway in regulation of mucosal viral pathogens.ImportanceType III interferons are potent antiviral cytokines important for regulation of viruses that infect at mucosal surfaces. Studies using mice lacking the type III interferon receptor, Ifnlr1, have demonstrated that signaling through this receptor is critical for protection against influenza virus, norovirus, and reovirus. Using a genetic approach to disrupt murine type III interferon cytokine genes Ifnl2 and Ifnl3, we found that mice lacking these cytokines fully recapitulate the impaired control of viruses observed in mice lacking Ifnlr1 Our results support an exclusive role for known type III interferon cytokines in signaling via IFNLR to mediate antiviral effects at mucosal surfaces. These findings emphasize the importance of type III interferons in regulation of a variety of viral pathogens and provide important genetic evidence to support our understanding of the ligand-receptor interactions in this pathway.
Copyright ? 2019 American Society for Microbiology.
PMID: 31462571 DOI: 10.1128/JVI.01073-19