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Antibodies against free radical modified native DNA recognize B-conformation
Immunological Investigations
|October 1, 1992
Summary
Hydroxyl radicals damage DNA, leading to modifications recognized by antibodies. These findings suggest a link between DNA damage and Systemic Lupus Erythematosus (SLE) autoantibodies.
Area of Science:
- Biochemistry
- Immunology
- Molecular Biology
Background:
- Hydroxyl radicals, key reactive oxygen species, induce DNA modifications.
- These modifications are implicated in various human diseases.
Purpose of the Study:
- To investigate DNA modifications induced by hydroxyl radicals.
- To determine if these modified DNA structures are recognized by autoantibodies, particularly in Systemic Lupus Erythematosus (SLE).
Main Methods:
- Generating hydroxyl radicals by exposing hydrogen peroxide to UV light in the presence of calf thymus DNA.
- Analyzing DNA modifications using techniques like Tm measurement.
- Inducing antibodies against modified DNA in experimental animals.
- Testing the binding of these antibodies and SLE patient autoantibodies to modified DNA using ELISA and gel retardation assays.
Main Results:
- Hydroxyl radical exposure caused single-strand breaks, decreased Tm, and modified adenine and thymine bases in DNA.
- Antibodies generated against modified DNA were immunogen-specific and recognized native DNA.
- Naturally occurring autoantibodies from SLE patients recognized the hydroxyl radical-modified DNA.
Conclusions:
- Hydroxyl radical-induced DNA modifications are immunogenic.
- Autoantibodies in SLE patients can recognize these modified DNA structures, suggesting a role in SLE pathogenesis.