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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.

Antigen Processing Pathways

Antigen Processing Pathways

MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...

Antigen Presenting Cells

Antigen Presenting Cells

The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...

Diversity of Antigen Receptors

Diversity of Antigen Receptors

Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...

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Related Experiment Video

Updated: May 24, 2026

Visualizing Antigen Specific CD4+ T Cells using MHC Class II Tetramers

Visualizing Antigen Specific CD4+ T Cells using MHC Class II Tetramers

Published on: March 6, 2009

AntigenMap 3D: an online antigenic cartography resource.

J Lamar Barnett¹, Jialiang Yang, Zhipeng Cai

¹Department of Basic Sciences, College of Veterinary Medicine, Mississippi State University, Mississippi State, MS 39762, USA.

Bioinformatics (Oxford, England)

|March 9, 2012

Summary

Antigenic cartography visualizes immunological data. A new 3D tool, AntigenMap 3D, improves visualization for identifying pathogen variants and vaccine candidates, especially for rapidly changing viruses like influenza.

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Last Updated: May 24, 2026

Visualizing Antigen Specific CD4+ T Cells using MHC Class II Tetramers

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Area of Science:

Immunology
Bioinformatics
Computational Biology

Background:

Antigenic cartography aids in visualizing and reducing errors in immunological data.
Two-dimensional (2D) cartography may not fully capture complex antigenic relationships in high-dimensional data.

Purpose of the Study:

To introduce AntigenMap 3D, an online, interactive resource for constructing and visualizing 3D antigenic cartography.
To provide a robust tool for analyzing high-dimensional immunological data.

Main Methods:

Development of an online platform for 3D antigenic cartography construction.
Implementation of interactive visualization features for exploring antigenic relationships.

Main Results:

AntigenMap 3D enables the creation of 3D antigenic maps from immunological data.
The tool facilitates the identification of antigenic variants and potential vaccine candidates.

Conclusions:

AntigenMap 3D offers a superior method for visualizing complex antigenic data compared to 2D approaches.
This resource is particularly valuable for pathogens with rapid antigenic variation, such as influenza A virus, aiding in vaccine development.