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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...

Humoral Immune Responses

Humoral Immune Responses

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 reactivity.

Cross-reactivity

Cross-reactivity

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...

B Cell Activation and Differentiation

B Cell Activation and Differentiation

The adaptive immune response, a sophisticated defense mechanism, relies on the activation and differentiation of B lymphocytes, or B cells. These processes enable our bodies to mount a tailored response against specific pathogens such as bacteria, free virus particles, toxins, and parasites.
When naive B cells encounter a specific antigen that can bind to the B cell receptor (BCR) on their surface, they undergo sensitization to respond to the antigen's presence. Sensitization begins with...

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Related Experiment Video

Updated: May 22, 2026

Printed Glycan Array: A Sensitive Technique for the Analysis of the Repertoire of Circulating Anti-carbohydrate Antibodies in Small Animals

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Antibodies are challenged.

Jayeeta Banerjee¹

¹DST Fast Track Scientist, Biology Department, IISER-Pune, Central Tower, Pune, Maharashtra, India. jayeetab@iiserpune.ac.in

Indian Journal of Medical Sciences

|May 10, 2012

Summary

This summary is machine-generated.

Aptamers, or "chemical antibodies," are novel oligonucleotide therapeutics that mimic antibody functions. This review explores their synthesis, handling, and applications, highlighting their growing importance in biotechnology.

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Area of Science:

Biotechnology
Molecular Biology
Immunology

Background:

Antibodies, proteins used for antigen identification and neutralization, have dominated biomedical research since the 1890s.
Aptamers, discovered in the 1990s, are single-stranded oligonucleotides or peptides with high target affinity and specificity.
Often called "chemical antibodies" due to their synthetic origin and similar functions, aptamers are rapidly emerging as key players in biomedical applications.

Purpose of the Study:

To provide an overview of aptamer technology.
To compare and contrast aptamers with antibodies.
To discuss the synthesis, handling, and applicability of aptamers.

Main Methods:

Literature review of aptamer and antibody research.
Comparative analysis of aptamer and antibody characteristics.
Discussion of aptamer applications in detection, imaging, inhibition, and therapeutics.

Main Results:

Aptamers exhibit high affinity and specificity for target molecules, similar to antibodies.
Aptamer technology offers advantages in synthesis and handling compared to antibodies.
The aptamer market is experiencing significant growth, with approved drugs and numerous clinical trials.

Conclusions:

Aptamers represent a promising alternative to antibodies in various biomedical fields.
The unique properties of aptamers facilitate their use in diagnostics and therapeutics.
Continued research and development in aptamer technology are expected to drive innovation in medical biotechnology.