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Antibody Actions

Antibody Actions

Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...

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Related Experiment Video

Updated: Oct 6, 2025

Quantification of Protein Interaction Network Dynamics using Multiplexed Co-Immunoprecipitation

Quantification of Protein Interaction Network Dynamics using Multiplexed Co-Immunoprecipitation

Published on: August 21, 2019

Previously Unrecognized Nonreproducible Antibody-Probe Interactions.

Jiaojiao Pan^1,2, Lan Yang¹, Wenya Wu^1,2

¹Division of Nanobiomedicine, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.

Analytical Chemistry

|January 19, 2022

Summary

Antibody-antigen interactions are often unpredictable. A new four-state model (0-NRI-RI-Hook) explains nonreproducible antibody-probe interactions (NRIs) and nonspecific binding, challenging traditional models in immunology.

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Area of Science:

Immunology
Biochemistry
Biotechnology

Background:

Traditional models of antibody-antigen interactions only account for noninteraction (0) or reproducible interaction (RI) states.
These models fail to explain the common occurrence of nonreproducible signals in antibody-based assays.
Understanding these nonreproducible signals is crucial for accurate serological and immunological diagnostics.

Purpose of the Study:

To investigate the nature of nonreproducible antibody-based results.
To develop a new model that explains nonreproducible antibody-probe interactions (NRIs).
To challenge the reliance on specificity data in antibody-based research.

Main Methods:

Utilized a peptide-protein hybrid microarray to monitor diverse experimental systems.
Observed and identified nonreproducible antibody-probe interactions (NRIs).
Developed and validated the "0-NRI-RI-Hook four-state model" for antibody interactions.

Main Results:

Antibody-probe interactions were identified as a significant source of nonreproducible results.
The "0-NRI-RI-Hook four-state model" was developed, accurately describing antibody interactions.
This model demonstrates that both nonspecific interactions and NRIs are concentration-dependent and unavoidable.
The model accounts for four states: noninteraction (0), nonreproducible interaction (NRI), reproducible interaction (RI), and hook effect.

Conclusions:

Nonreproducible antibody-probe interactions (NRIs) are a substantial factor in antibody-based assays.
The "0-NRI-RI-Hook four-state model" provides a more comprehensive understanding of antibody-antigen interactions.
The findings challenge the established paradigms in serology and immunology by highlighting the limitations of specificity-focused data.