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Different Mechanisms Are Utilized by Coronavirus Transmissible Gastroenteritis Virus To Regulate Interferon Lambda 1

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Area of Science:

  • Immunology
  • Virology
  • Cell Biology

Background:

  • Type III interferons (IFN-λ) are crucial for epithelial cell defense at barrier surfaces.
  • Transmissible gastroenteritis virus (TGEV), an alphacoronavirus, causes significant intestinal damage in swine.
  • Understanding coronavirus-induced IFN-λ modulation is vital for innate antiviral responses.

Purpose of the Study:

  • To investigate the differential induction and regulation of IFN-λ1 and IFN-λ3 by TGEV.
  • To elucidate the molecular mechanisms underlying TGEV-mediated IFN-λ production.
  • To compare the antiviral efficacy of IFN-λ1 and IFN-λ3 against TGEV.

Main Methods:

  • In vitro and in vivo experiments to assess IFN-λ production upon TGEV infection.
  • Analysis of signaling pathways including RIG-I-like receptors (RLRs) and unfolded protein response (UPR).
  • Site-directed mutagenesis of TGEV nsp1 protein and functional domain analysis.
  • Assessment of antiviral activity of IFN-λ1 and IFN-λ3 in porcine intestinal epithelial cells (IPEC-J2).

Main Results:

  • TGEV infection induced higher IFN-λ3 production than IFN-λ1, despite higher basal IFN-λ1 expression.
  • IFN-λ3 production involved the RIG-I-like receptor (RLR) pathway, while IFN-λ1 did not.
  • TGEV nsp1 protein activated both IFN-λ1 and IFN-λ3 via NF-κB signaling through the PERK-eIF2α UPR pathway.
  • A specific motif (amino acids 85-102) in TGEV nsp1 was critical for IFN-λ induction.
  • IFN-λ3 exhibited greater antiviral activity against TGEV than IFN-λ1 in IPEC-J2 cells.

Conclusions:

  • Distinct regulatory mechanisms govern IFN-λ1 and IFN-λ3 production during TGEV infection.
  • TGEV nsp1 plays a key role in modulating IFN-λ responses through UPR and NF-κB activation.
  • IFN-λ3 represents a more potent antiviral agent against TGEV, suggesting therapeutic potential.