Importance of type I and III interferons at respiratory and intestinal barrier surfaces

Interferons (IFNs) constitute the first line of defense against microbial infections particularly against viruses. They provide antiviral properties to cells by inducing the expression of hundreds of genes known as interferon-stimulated genes (ISGs). The two most important IFNs that can be produced...

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Main Authors: Stanifer, Megan (Author) , Guo, Cuncai (Author) , Doldan, Patricio (Author) , Boulant, Steeve (Author)
Format: Article (Journal)
Language:English
Published: 1 December 2020
In: Frontiers in immunology
Year: 2020, Volume: 11, Pages: 1-14
ISSN:1664-3224
DOI:10.3389/fimmu.2020.608645
Online Access:Verlag, lizenzpflichtig, Volltext: https://doi.org/10.3389/fimmu.2020.608645
Verlag, lizenzpflichtig, Volltext: https://www.frontiersin.org/articles/10.3389/fimmu.2020.608645/full
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Author Notes:Megan L. Stanifer, Cuncai Guo, Patricio Doldan and Steeve Boulant

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520 |a Interferons (IFNs) constitute the first line of defense against microbial infections particularly against viruses. They provide antiviral properties to cells by inducing the expression of hundreds of genes known as interferon-stimulated genes (ISGs). The two most important IFNs that can be produced by virtually all cells in the body during intrinsic innate immune response belong to two distinct families: the type I and type III IFNs. The type I IFN receptor is ubiquitously expressed whereas the type III IFN receptor’s expression is limited to epithelial cells and a subset of immune cells. While originally considered to be redundant, type III IFNs have now been shown to play a unique role in protecting mucosal surfaces against pathogen challenges. The mucosal specific functions of type III IFN do not solely rely on the restricted epithelial expression of its receptor but also on the distinct means by which type III IFN mediates its anti-pathogen functions compared to the type I IFN. In this review we first provide a general overview on IFNs and present the similarities and differences in the signal transduction pathways leading to the expression of either type I or type III IFNs. By highlighting the current state-of-knowledge of the two archetypical mucosal surfaces (e.g. the respiratory and intestinal epitheliums), we present the differences in the signaling cascades used by type I and type III IFNs to uniquely induce the expression of ISGs. We then discuss in detail the role of each IFN in controlling pathogen infections in intestinal and respiratory epithelial cells. Finally, we provide our perspective on novel concepts in the field of IFN (stochasticity, response heterogeneity, cellular polarization/differentiation and tissue microenvironment) that we believe have implications in driving the differences between type I and III IFNs and could explain the preferences for type III IFNs at mucosal surfaces. 
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