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DNA-hydrolyzing autoantibodies

A G Gabibov1, G V Gololobov, O I Makarevich

  • 1Engelhardt Institute of Molecular Biology, Russian Academy of Sciences, Moscow.

Applied Biochemistry and Biotechnology
|May 1, 1994
PubMed
Summary
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Researchers found that autoantibodies to DNA from patients with systemic lupus erythematosus (SLE) can actively break down DNA. This DNA-hydrolyzing activity suggests a novel mechanism for autoimmune damage in SLE.

Area of Science:

  • Immunology
  • Biochemistry
  • Molecular Biology

Background:

  • Autoantibodies to DNA are a key marker for systemic lupus erythematosus (SLE).
  • Antibodies typically bind antigens, but some may possess catalytic activity, potentially causing more damage.

Purpose of the Study:

  • To investigate the DNA-hydrolyzing activity of DNA-binding autoantibodies from SLE patients.
  • To characterize the catalytic properties and specificity of these autoantibodies.

Main Methods:

  • Purification of DNA-binding autoantibodies using protein A-sepharose, HPLC gel filtration, and DNA-affinity chromatography.
  • Assessing DNA hydrolysis using supercoiled plasmid, radiolabeled DNA fragments, and oligonucleotides as substrates.
  • Utilizing gel electrophoresis, autoradiography, and linear dichroism to detect DNA fragmentation.

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Main Results:

  • DNA-binding autoantibodies purified from SLE patients demonstrated significant DNA-hydrolyzing activity.
  • Hydrolysis was confirmed by DNA fragmentation visualized via gel electrophoresis and autoradiography.
  • Catalytic activity was localized to the Fab fragments of the autoantibodies, not the Fc fragment.

Conclusions:

  • Autoantibodies in SLE patients possess intrinsic DNA-hydrolyzing capabilities.
  • This catalytic activity may contribute to the pathogenesis and tissue damage observed in systemic lupus erythematosus.
  • The findings highlight a potential new avenue for understanding and treating SLE.