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Type I interferons in infectious disease.

Finlay McNab1, Katrin Mayer-Barber2, Alan Sher2

  • 11] Allergic Inflammation Discovery Performance Unit, Respiratory Disease Respiratory Research and Development, GlaxoSmithKline, Stevenage, Hertfordshire SG1 2NY, UK. [2] Division of Immunoregulation, Medical Research Council (MRC) National Institute for Medical Research, Mill Hill, London NW7 1AA, UK.

Nature Reviews. Immunology
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Summary
This summary is machine-generated.

Type I interferons (IFNs) play complex roles in infections. While crucial for antiviral defense, they can cause harm in acute infections or suppression in chronic ones, highlighting intricate immune regulation.

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Area of Science:

  • Immunology
  • Infectious Diseases
  • Molecular Biology

Background:

  • Type I interferons (IFNs) are critical immune mediators with diverse roles in host defense against various pathogens.
  • Their function varies significantly depending on the type of infection, ranging from essential antiviral activity to detrimental immunopathology or immunosuppression.

Purpose of the Study:

  • To elucidate the multifaceted roles of Type I IFNs in different infectious contexts.
  • To explore the regulatory mechanisms governing Type I IFN activity during infections.
  • To understand how cytokine networks modulate Type I IFN responses for host protection.

Main Methods:

  • Review and synthesis of existing literature on Type I IFN function in viral, bacterial, parasitic, and fungal infections.
  • Analysis of experimental models, including those for influenza, Listeria monocytogenes, Mycobacterium tuberculosis, and lymphocytic choriomeningitis virus.
  • Examination of cytokine cross-regulation, such as the roles of prostaglandin E2 and interleukin-1.

Main Results:

  • Type I IFNs are vital for antiviral immunity but can exacerbate pathology in acute viral infections (e.g., influenza).
  • In chronic viral infections (e.g., LCMV), Type I IFNs can induce immunosuppression.
  • During bacterial infections, optimal Type I IFN levels are context-dependent, with high concentrations potentially impairing immune cell function and promoting immunosuppression.

Conclusions:

  • Type I IFNs exhibit a dual role in infectious diseases, necessitating precise regulation.
  • Cytokine networks, including prostaglandin E2 and interleukin-1, actively modulate Type I IFN expression and downstream effects.
  • Understanding these complex regulatory interactions is key to balancing host protection with minimal tissue damage.