Determination of a monoclonal antibody binding activity using immunodetection

Area of Science:

• Biochemistry
• Immunology
• Analytical Chemistry

Background:

• Chimeric IgG BR-96 targets the Lewis Y antigen, a biomarker of interest.
• Accurate measurement of antibody-antigen binding is crucial for diagnostics and therapeutics.
• Existing immunoassays may lack speed, reproducibility, or automation capabilities.

Purpose of the Study:

• To develop and validate a rapid and reproducible method for quantifying chimeric IgG BR-96 binding to the Lewis Y antigen.
• To assess the assay's correlation with established methods and its robustness against sample degradation and cross-reactivity.

Main Methods:

• Utilized ImmunoDetection technology for binding assays.
• Employed conventional High-Performance Liquid Chromatography (HPLC) equipment.
• Assessed assay performance metrics including speed, reproducibility, correlation, and cross-reactivity.

Main Results:

• The developed method provides results in 2 minutes with high reproducibility (< 5% CV).
• Demonstrated excellent correlation with Lewis Y and anti-idiotypic enzyme immunoassays.
• Showed minimal cross-reactivity with other proteins and a different chimeric IgG (L6).
• Observed reduced binding activity in samples degraded by heat or freeze-thaw cycles.

Conclusions:

• The ImmunoDetection assay is a rapid, reproducible, and accurate method for measuring chimeric IgG BR-96 and Lewis Y antigen binding.
• The assay's compatibility with standard HPLC equipment facilitates automation and broad accessibility.
• This method holds promise for applications requiring efficient and reliable antibody-antigen interaction analysis.