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A murine monoclonal multireactive immunoglobulin kappa light chain
W Mahana1, F Jacquemart, M Ermonval
1Unité d'Immunocytochimie, Institut Pasteur, Paris, France.
Scandinavian Journal of Immunology
|January 1, 1994
Summary
Free immunoglobulin kappa light chains (KLC) can bind to various molecules, including self and non-self antigens. This study characterized the N12.12 monoclonal KLC, revealing its unexpected multireactivity.
Area of Science:
- Immunology
- Molecular Biology
- Biochemistry
Background:
- Monoclonal antibodies are typically composed of both heavy and light chains.
- Immunoglobulin kappa light chains (KLC) are a component of antibodies.
- B-cell hybridomas are used to produce monoclonal antibodies.
Purpose of the Study:
- To characterize the binding properties of a secreted monoclonal immunoglobulin kappa light chain (KLC), N12.12.
- To determine if free KLC exhibits antigen-binding capabilities.
- To investigate the potential multireactivity of free KLC.
Main Methods:
- Enzyme immunoassay (EIA) and SDS-PAGE to detect heavy chains.
- Biosynthetic labeling with 35S-methionine to identify secreted proteins.
- Antigen-binding assays using mouse actin, TNP25-BSA, and bovine myoglobin.
- Inhibition assays to determine binding specificity and dissociation constant (KD).
Main Results:
- The N12.12 hybridoma secreted only kappa light chains, with no detectable heavy chains.
- N12.12 KLC demonstrated binding to mouse actin and trinitrophenylated bovine serum albumin (TNP25-BSA).
- Binding to mouse actin was specific and exhibited a dissociation constant (KD) of 10(-7) M.
Conclusions:
- Free immunoglobulin kappa light chains can possess antigen-binding capabilities.
- The N12.12 KLC displays multireactivity, binding to both self (mouse actin) and non-self (TNP25-BSA) molecules.
- These findings suggest that free KLCs may contribute to natural antibody multireactivity.