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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

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...

Antibody Structure and Classes

Antibody Structure and Classes

Antibodies, also known as immunoglobulins, are produced by B cells in response to foreign substances, such as bacteria and viruses. These proteins are critical for recognizing and neutralizing these substances, protecting the body from potential harm.
The basic structure of an antibody consists of four protein chains: two identical heavy chains and two identical light chains. These chains are held together by disulfide bonds and other non-covalent interactions, forming a Y-shaped structure.

Antimicrobial Proteins

Antimicrobial Proteins

Antimicrobial proteins are important components of the immune system. They aid the body in combating pathogens by either killing them directly or hindering their replication processes. Four main types of antimicrobial substances are interferons, the complement system, iron-binding proteins, and antimicrobial proteins.
Interferons
Interferons (IFNs) are proteins produced by lymphocytes, macrophages, and fibroblasts infected with viruses. While IFNs cannot prevent viruses from entering and...

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Related Experiment Video

Updated: Feb 20, 2026

A Method to Assess Fc-mediated Effector Functions Induced by Influenza Hemagglutinin Specific Antibodies

A Method to Assess Fc-mediated Effector Functions Induced by Influenza Hemagglutinin Specific Antibodies

Published on: February 23, 2018

Beyond binding: antibody effector functions in infectious diseases.

Lenette L Lu^1,2, Todd J Suscovich¹, Sarah M Fortune²

¹Ragon Institute of MGH, MIT and Harvard, 400 Technology Square, Cambridge, Massachusetts 02139, USA.

Nature Reviews. Immunology

|October 25, 2017

Summary

Antibodies are crucial for fighting infections by neutralizing pathogens and working with the immune system. Understanding antibody functions can improve vaccines and treatments for infectious diseases.

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Published on: November 30, 2011

Area of Science:

Immunology
Infectious Diseases
Vaccinology

Background:

Antibodies are key components of host defense against pathogens.
Beyond pathogen neutralization, antibodies employ diverse mechanisms to control infections.

Purpose of the Study:

To review antibody effector functions in host defense.
To discuss how these functions balance microbial clearance and pathology.
To guide rational vaccine and therapeutic design.

Main Methods:

Literature review of antibody effector mechanisms.
Analysis of antibody interactions with innate and adaptive immunity.
Examination of antibody constant domain regulation.

Main Results:

Antibodies form immune complexes for pathogen clearance, toxin neutralization, and infected cell elimination.
Antibody effector functions enhance antigen presentation and regulate inflammation.
Antibody constant domain modifications dynamically regulate effector functions.

Conclusions:

Antibody effector functions are critical for controlling infections and preventing pathology.
Targeting antibody mechanisms offers potential for improved vaccines and therapies.
Further understanding can address gaps in infectious disease armamentarium.