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Lambda interferons come to light: dual function cytokines mediating antiviral immunity and damage control.

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Lambda interferons (IFNλs) are crucial for frontline antiviral defense at anatomical barriers, acting before type I interferons. These cytokines also regulate inflammation and limit host damage, demonstrating a dual role in immunity and tissue protection.

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Area of Science:

  • Immunology
  • Virology
  • Cytokine Biology

Background:

  • Lambda interferons (IFNλs), also known as type III IFNs or interleukins-28/29, were identified 15 years ago.
  • They share structural and functional similarities with IL-10 and type I IFNs.
  • IFNλs utilize a unique receptor complex (IFNLR1 and IL10R2) but share signaling pathways with type I IFNs, raising questions about their distinct biological significance.

Purpose of the Study:

  • To review current evidence on the non-redundant roles of IFNλs.
  • To highlight the primary function of IFNλs in antiviral immunity at anatomical barriers.
  • To discuss the emerging roles of IFNλs in inflammation regulation and host damage control.

Main Methods:

  • Literature review of recent scientific evidence.
  • Analysis of comparative roles of IFNλs and type I IFNs.
  • Examination of IFNλ signaling and function.

Main Results:

  • IFNλs play a primary role in frontline antiviral defense at epithelial barriers, preceding type I IFN responses.
  • IFNλs exhibit distinct functions from type I IFNs in regulating inflammation and minimizing host tissue damage.
  • Evidence supports a dual role for IFNλs in mediating antiviral immunity and controlling inflammation.

Conclusions:

  • IFNλs are critical for initiating antiviral responses at mucosal surfaces.
  • IFNλs possess unique immunomodulatory functions distinct from type I IFNs, particularly in limiting inflammation and damage.
  • IFNλs represent key cytokines with dual roles in antiviral defense and host protection.