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Human polyclonal and monoclonal IgG and IgM complement 3 nephritic factors: evidence for idiotypic commonality
G C Tsokos1, A E Stitzel, A D Patel
1Department of Medicine, Uniformed Services University of the Health Sciences, Bethesda, Maryland 20892.
Clinical Immunology and Immunopathology
|October 1, 1989
Summary
Complement 3 nephritic factors (C3NeF) from MPGN patients share a common idiotype. These autoantibodies do not appear to be triggered by common antigens, suggesting a unique autoimmune response.
Area of Science:
- Immunology
- Nephrology
Background:
- Membranoproliferative glomerulonephritis (MPGN) is associated with complement 3 nephritic factors (C3NeF).
- The origin and antigenic targets of C3NeF remain incompletely understood.
Purpose of the Study:
- To investigate the genesis and diversity of C3NeF antibodies.
- To determine if C3NeF share common idiotypic determinants.
- To identify potential antigens responsible for C3NeF autoantibody production.
Main Methods:
- Isolation of C3NeF from patient sera and cell cultures.
- Establishment of human monoclonal C3NeF antibodies (IgG and IgM).
- Affinity chromatography to isolate anti-idiotypic antibodies (anti-IdNeF).
- Binding assays to assess antibody interactions.
Main Results:
- All anti-IdNeF preparations bound to C3NeF from various sources, including monoclonal antibodies.
- Monoclonal C3NeF did not bind to a wide range of common antigens.
- C3NeF antibodies demonstrated a shared idiotype.
Conclusions:
- C3NeF express a common idiotype, indicating a shared structural feature.
- The autoantibodies are unlikely to be a response to common environmental or self-antigens.
- Further research is needed to elucidate the specific trigger for C3NeF production in MPGN.