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Autoimmune diseases are a group of disorders in which the body's immune system mistakenly attacks its own cells, tissues, and organs. This results from an overactive immune response against substances and tissues normally present in the body. Let's delve into the concept and mechanism of autoimmune diseases from an immune system point of view, explore different causes and examples of such diseases, and discuss potential solutions.
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An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
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Interferon and autoantigens: intersection in autoimmunity.

Brendan Antiochos1, Livia Casciola-Rosen1

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|May 25, 2023
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Summary
This summary is machine-generated.

The interferon (IFN) system is upregulated in rheumatic diseases, with autoantibodies targeting IFN-stimulated genes (ISGs) and other IFN-related proteins. This review explores why these IFN-linked proteins become autoantigens in conditions like SLE.

Keywords:
autoantibodyautoantigenautoimmunityinnate immunityinterferon

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Area of Science:

  • Immunology
  • Rheumatology
  • Molecular Biology

Background:

  • The interferon (IFN) system is crucial for innate immunity.
  • IFN system dysregulation is observed in various rheumatic diseases, especially those with autoantibody production, including SLE, Sjögren's syndrome, myositis, and systemic sclerosis.
  • Autoantibodies in these diseases frequently target components of the IFN system.

Purpose of the Study:

  • To review the features of IFN-linked proteins that contribute to their recognition as autoantigens.
  • To discuss the role of the IFN system in the pathogenesis of rheumatic diseases.
  • To highlight the connection between IFN system components and autoantibody targets.

Main Methods:

  • Literature review of studies on interferonopathies and rheumatic diseases.
  • Analysis of autoantigen targets in systemic autoimmune diseases.
  • Examination of IFN-stimulated genes (ISGs), pattern recognition receptors (PRRs), and IFN modulators as autoantigens.

Main Results:

  • Many autoantigens in rheumatic diseases are components of the IFN system, including ISGs, PRRs, and IFN modulators.
  • The characteristics of these IFN-linked proteins may explain their immunogenicity and status as autoantigens.
  • Anti-IFN autoantibodies are also noted in certain immunodeficiency states.

Conclusions:

  • The aberrant upregulation of the IFN system in rheumatic diseases creates a milieu where its components become targets for autoantibodies.
  • Understanding the features of IFN-linked autoantigens is key to elucidating disease mechanisms in autoimmune conditions.
  • Further research into the interplay between the IFN system and autoimmunity is warranted.