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False-positive signals in enzyme immunoassay (EIA) interactions between rodent IgG subclasses
1Quadrant Research Foundation, Cambridge Research Laboratories, U.K.
Journal of Immunological Methods
|June 12, 1990
Summary
Mouse and rat monoclonal antibodies (MAbs) show isotype-dependent interactions, with IgG2a subclasses exhibiting the strongest binding. These findings reveal specific antibody interactions relevant to immunoassays.
Area of Science:
- Immunology
- Biochemistry
Background:
- Monoclonal antibodies (MAbs) are crucial tools in various biological assays.
- Understanding interactions between MAbs from different species, like mouse and rat, is important for assay development.
Purpose of the Study:
- To investigate and characterize the interactions between mouse and rat monoclonal antibodies (MAbs) in Enzyme Immunoassays (EIA).
- To determine the influence of antibody isotype on these interspecies MAb interactions.
Main Methods:
- Utilized panels of mouse and rat MAbs across various isotypes.
- Employed Enzyme Immunoassays (EIA) to detect and quantify antibody binding.
- Investigated intraspecies interactions using rat kappa light chain allotypes.
Main Results:
- Mouse and rat IgG2a MAbs demonstrated the strongest binding interactions.
- Immobilized IgG1 antibodies showed significantly less interaction between species.
- Rat IgG2b and IgG2c isotypes exhibited intermediate binding activity.
- Intraspecies interactions among rat MAbs were also observed.
Conclusions:
- Antibody isotype significantly influences interspecies MAb interactions in EIA.
- The IgG2a subclass appears particularly prone to self- and cross-species binding.
- Potential molecular basis for IgG2a interactions may involve its extended hinge region and flexible Fab arms.