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Related Experiment Videos

Oxygen free radicals and systemic autoimmunity.

H Ahsan1, A Ali, R Ali

  • 1Department of Biochemistry, Faculty of Medicine, J.N. Medical College, AMU, Aligarh-202002, India.

Clinical and Experimental Immunology
|February 28, 2003
PubMed
Summary

Reactive oxygen species cause DNA damage, leading to the production of immunogenic DNA modifications. These modifications are implicated in autoimmune diseases like systemic lupus erythematosus (SLE), particularly in kidney inflammation.

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Area of Science:

  • Biochemistry
  • Immunology
  • Molecular Biology

Background:

  • Reactive oxygen species (ROS) are byproducts of metabolic processes that can cause oxidative damage to DNA.
  • Oxidative DNA damage can lead to mutations and DNA-protein cross-links, potentially triggering autoimmune responses.
  • Systemic lupus erythematosus (SLE) is a prototypic autoimmune disease associated with autoantibodies against nuclear antigens.

Purpose of the Study:

  • To investigate the role of reactive oxygen species and subsequent DNA modifications in the pathogenesis of autoimmune diseases.
  • To explore the immunogenicity of modified DNA and the characteristics of induced autoantibodies.
  • To establish the link between oxidative DNA damage and clinical manifestations in SLE patients.

Main Methods:

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  • Analysis of DNA modifications induced by reactive oxygen species, specifically the hydroxy radical (*OH).
  • Assessment of the immunogenicity of modified DNA and characterization of autoantibody binding.
  • Detection of specific oxidative damage markers, such as 8-hydroxyguanosine, in DNA from SLE patients.
  • Correlation of autoantibody titers with the degree of renal inflammation in SLE.

    • Main Results:

    • Reactive oxygen species generate various DNA modifications, including sugar/base products and DNA-protein cross-links.
    • Modified DNA is highly immunogenic, eliciting autoantibodies with diverse binding specificities.
    • 8-hydroxyguanosine was detected in immune complex-derived DNA from SLE patients, supporting ROS involvement.
    • Increased apoptosis and impaired clearance of apoptotic cells may contribute to SLE pathogenesis.
    • Autoantibody titers correlate with renal inflammation severity in SLE patients.

    Conclusions:

    • Reactive oxygen species-induced DNA damage is a significant factor in the pathogenesis of autoimmune diseases like SLE.
    • The immunogenicity of modified DNA contributes to autoantibody production and immune complex formation.
    • Oxidative stress and aberrant apoptosis play crucial roles in the development and progression of systemic autoimmunity.
    • Anti-DNA antibodies contribute to immune complex deposition in renal glomeruli, exacerbating kidney inflammation in SLE.