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Cross-reactivity

Cross-reactivity

Antigens Involved in Adaptive Immunity

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and...

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...

Affinity and Avidity

Affinity and Avidity

Antibody Structure

Antibody Structure

Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...

Humoral Immune Responses

Humoral Immune Responses

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Related Experiment Video

Updated: Apr 22, 2026

Single-cell Screening Method for the Selection and Recovery of Antibodies with Desired Specificities from Enriched Human Memory B Cell Populations

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Anti-idiotypic antibodies: what do they recognize?

¹Department of Microbiology, Cancer Center/Institute of Cancer Research, Columbia University, New York, NY 10032, USA.

Immunology Today

|October 8, 2014

Summary

Anti-idiotypic antibodies can mimic ligands by binding to target epitopes. This cross-reactivity with receptors allows them to act as internal images of ligands, impacting biological recognition.

Area of Science:

Immunology
Structural Biology
Biochemistry

Background:

Understanding ligand-binding proteins is crucial for molecular recognition.
Anti-idiotypic antibodies offer a unique tool to probe these interactions.

Purpose of the Study:

To discuss the reaction mechanisms of anti-idiotypic antibodies with target epitopes.
To explore their cross-reactivity with receptors and function as internal images of ligands.

Main Methods:

Theoretical discussion based on current understanding of protein structure.
Analysis of antibody-epitope interactions and receptor cross-reactivity.

Main Results:

Anti-idiotypic antibodies can bind to specific epitopes on target proteins.

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These antibodies may mimic the structure and function of natural ligands.

Conclusions:

Anti-idiotypic antibodies serve as valuable probes for studying ligand-binding proteins.
Their ability to act as internal images has implications for understanding immune responses and developing diagnostics or therapeutics.