title: Morbillivirus control of the interferon response: relevance of STAT2 and mda5 but not STAT1 for canine distemper virus virulence in ferrets.
abstract: The V proteins of paramyxoviruses control the innate immune response. In particular, the V protein of the genus Morbillivirus interferes with the signal transducer and activator of transcription 1 (STAT1), STAT2, and melanoma differentiation-associated protein 5 (mda5) signaling pathways. To characterize the contributions of these pathways to canine distemper virus (CDV) pathogenesis, we took advantage of the knowledge about the mechanisms of interaction between the measles virus V protein with these key regulators of innate immunity. We generated recombinant CDVs with V proteins unable to properly interact with STAT1, STAT2, or mda5. A virus with combined STAT2 and mda5 deficiencies was also generated, and available wild-type and V-protein-knockout viruses were used as controls. Ferrets infected with wild-type and STAT1-blind viruses developed severe leukopenia and loss of lymphocyte proliferation activity and succumbed to the disease within 14 days. In contrast, animals infected with viruses with STAT2 or mda5 defect or both STAT2 and mda5 defects developed a mild self-limiting disease similar to that associated with the V-knockout virus. This study demonstrates the importance of interference with STAT2 and mda5 signaling for CDV immune evasion and provides a starting point for the development of morbillivirus vectors with reduced immunosuppressive properties.
  
  
  OBJECTIVE
  The V proteins of paramyxoviruses interfere with the recognition of the virus by the immune system of the host. For morbilliviruses, the V protein is known to interact with the signal transducer and activator of transcription 1 (STAT1) and STAT2 and the melanoma differentiation-associated protein 5 (mda5), which are involved in interferon signaling. Here, we examined the contribution of each of these signaling pathways to the pathogenesis of the carnivore morbillivirus canine distemper virus. Using viruses selectively unable to interfere with the respective signaling pathway to infect ferrets, we found that inhibition of STAT2 and mda5 signaling was critical for lethal disease. Our findings provide new insights in the mechanisms of morbillivirus immune evasion and may lead to the development of new vaccines and oncolytic vectors.
authors.affiliation: INRS-Institut Armand-Frappier, University of Quebec, Laval, Quebec, Canada.
authors.forename: Nicholas
authors.initials: N
authors.lastname: Svitek
authors.forename: Ingo
authors.initials: I
authors.lastname: Gerhauser
authors.forename: Christophe
authors.initials: C
authors.lastname: Goncalves
authors.forename: Elena
authors.initials: E
authors.lastname: Grabski
authors.forename: Marius
authors.initials: M
authors.lastname: Döring
authors.forename: Ulrich
authors.initials: U
authors.lastname: Kalinke
authors.forename: Danielle E
authors.initials: DE
authors.lastname: Anderson
authors.forename: Roberto
authors.initials: R
authors.lastname: Cattaneo
authors.forename: Veronika
authors.initials: V
authors.lastname: von Messling
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D001483:Base Sequence; D001665:Binding Sites; D002460:Cell Line; D002467:Cell Nucleus / Q000378:metabolism; D017124:Conserved Sequence; D004216:Distemper / Q000276:immunology / Q000378:metabolism*; D004217:Distemper Virus, Canine / Q000235:genetics / Q000276:immunology / Q000472:pathogenicity*; D005289:Ferrets; D006801:Humans; D007372:Interferons / Q000378:metabolism*; D008297:Male; D008969:Molecular Sequence Data; D009154:Mutation; D010750:Phosphoproteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D011485:Protein Binding; D021381:Protein Transport; D020365:RNA Helicases / Q000378:metabolism*; D050794:STAT1 Transcription Factor; D050795:STAT2 Transcription Factor / Q000378:metabolism*; D015398:Signal Transduction; D014764:Viral Proteins / Q000737:chemistry / Q000235:genetics / Q000378:metabolism; D014774:Virulence / Q000235:genetics; D014779:Virus Replication
chemical_list: D010750:Phosphoproteins; D050794:STAT1 Transcription Factor; D050795:STAT2 Transcription Factor; C069181:V protein, measles virus; D014764:Viral Proteins; D007372:Interferons; D020365:RNA Helicases