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An unusual mouse myeloma protein binding native DNA
Clinical and Experimental Immunology
|February 1, 1975
Summary
A mouse myeloma protein, SP 104, exhibits antibody activity against double-stranded DNA. Its specificity mirrors antibodies found in human systemic lupus erythematosus (SLE) and related mouse models.
Area of Science:
- Immunology
- Molecular Biology
- Autoimmunity
Background:
- Systemic lupus erythematosus (SLE) is an autoimmune disease characterized by autoantibodies, including those targeting DNA.
- Murine models are crucial for understanding SLE pathogenesis and antibody production.
Purpose of the Study:
- To characterize a novel monoclonal IgA-kappa myeloma protein, SP 104, derived from CA F1 mice.
- To investigate the antibody activity and specificity of SP 104, particularly its binding to DNA.
Main Methods:
- Monoclonal antibody production from a lymphoid tumor in CA F1 mice.
- Immunoelectrophoresis to confirm monoclonal IgA nature.
- Assessment of antibody activity against native double-stranded DNA.
Main Results:
- SP 104 was identified as a monoclonal IgA-kappa protein.
- The protein demonstrated specific antibody activity against native double-stranded DNA.
- SP 104's specificity closely resembled human SLE and NZB/NZW F1 mouse anti-DNA antibodies.
- SP 104's idiotype did not cross-react with other known DNA-binding mouse myeloma proteins.
Conclusions:
- SP 104 serves as a valuable model for studying anti-DNA antibodies relevant to SLE.
- The characterization of SP 104 provides insights into the idiotype and specificity of autoantibodies in autoimmune diseases.