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Specificities of monoclonal antibodies against the complement C3d split product
E D Lund1, L S Sørensen, I Brandslund
1Department of Clinical Chemistry, Vejle County Hospital, Denmark.
Complement and Inflammation
|January 1, 1990
Summary
Developing an ELISA for complement split product C3d quantification is challenging. Current antibodies show cross-reactivity, hindering specific C3d measurement in plasma. Further research is needed for accurate C3d assays.
Area of Science:
- Immunology
- Biochemistry
Background:
- The quantification of complement split product C3d is crucial for understanding complement system activation.
- The current gold standard, rocket immunoelectrophoresis, is labor-intensive and costly.
- There is a need for a more accessible and efficient method for C3d measurement.
Purpose of the Study:
- To explore the feasibility of developing an enzyme-linked immunosorbent assay (ELISA) for direct C3d quantification in plasma.
- To evaluate the specificity of available antibodies for C3 and its degradation products.
Main Methods:
- PAGE immunoblotting was employed to assess antibody specificity against C3 and its breakdown products (C3b, C3bi).
- Investigated antibodies for their ability to specifically bind C3d.
Main Results:
- No commercially available antibodies demonstrated specificity for C3d.
- All tested antibodies exhibited cross-reactivity with C3 and/or its other degradation products (C3b, C3bi).
Conclusions:
- Developing a specific ELISA for C3d quantification is currently not feasible due to antibody limitations.
- The cross-reactivity issues necessitate the development of novel antibodies or alternative strategies for accurate C3d measurement.