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Type I Interferon Response Limits Astrovirus Replication and Protects against Increased Barrier Permeability In Vitro
Shauna A Marvin1, C Theodore Huerta2, Bridgett Sharp1
1Department of Infectious Diseases, St. Jude Children's Research Hospital, Memphis, Tennessee, USA.
Journal of Virology
|December 15, 2015
Summary
Type I interferons (IFN-β) limit astrovirus infection by inhibiting viral replication and protecting intestinal barrier permeability. This immune response was observed in both cell cultures and a new mouse model, suggesting a key role in astrovirus pathogenesis.
Area of Science:
- Virology
- Immunology
- Gastroenterology
Background:
- Human astroviruses (HAstV) are a significant cause of pediatric diarrhea.
- The intrinsic epithelial cell immune response to astrovirus infection is not well understood.
Purpose of the Study:
- To investigate the role of type I interferon in astrovirus infection.
- To characterize a new mouse model for astrovirus research.
Main Methods:
- Infection of differentiated Caco2 cells with HAstV-1.
- In vivo studies using a murine astrovirus (MuAstV) model.
- Assessment of viral replication, IFN-β production, and barrier permeability.
Main Results:
- HAstV-1 infection induced type I interferon (IFN-β) production in Caco2 cells.
- IFN-β inhibited viral RNA and capsid protein synthesis, reducing viral replication.
- IFN-β protected against increased intestinal barrier permeability caused by HAstV-1.
- Similar protective effects of type I IFNs were observed in the MuAstV mouse model.
Conclusions:
- Type I interferons play a crucial role in limiting astrovirus infection and preserving intestinal barrier function.
- The developed mouse model is valuable for studying astrovirus replication and pathogenesis in vivo.
- Virus-induced type I IFNs represent a potential therapeutic target against astrovirus infection.
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