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T Cell Activation and Clonal Selection

T Cell Activation and Clonal Selection

T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
Naive T cells that have not yet encountered an antigen express two primary CD...

Antigens Involved in Adaptive Immunity

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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.
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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.
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Related Experiment Video

Updated: Jun 25, 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

Visualizing antigen specific CD4+ T cells using MHC class II tetramers.

Eddie A James¹, Rebecca LaFond, Ivana Durinovic-Bello

¹Tetramer Core Laboratory, Benaroya Research Institute. ejames@benaroyaresearch.org

Journal of Visualized Experiments : Jove

|March 10, 2009

Summary

Major histocompatibility complex (MHC) class II tetramers visualize antigen-specific CD4+ T cells. An in vitro expansion step enhances detection sensitivity for these rare cells, enabling flow cytometry analysis.

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Simultaneous Quantification of Anti-vector and Anti-transgene-Specific CD8⁺ T Cells Via MHC I Tetramer Staining After Vaccination with a Viral Vector

Published on: November 28, 2018

Area of Science:

Immunology
Cell Biology
Biotechnology

Background:

Major histocompatibility complex (MHC) class II tetramers are crucial tools for visualizing antigen-specific CD4+ T cells.
The interaction between peptide-loaded MHC and T-cell receptors is highly specific, but individual affinities are low.
Avidity enhancement through streptavidin cross-linking enables tetramer staining, but low T cell frequencies necessitate improved detection methods.

Purpose of the Study:

To describe a method for the direct visualization and analysis of antigen-specific CD4+ T cells using MHC class II tetramers.
To detail an in vitro amplification strategy to increase the detection threshold for rare CD4+ T cell populations.
To outline subsequent flow cytometry analysis and potential downstream applications of tetramer-positive cells.

Main Methods:

Peripheral blood mononuclear cells (PBMCs) were purified, and CD4+ T cells were isolated via negative selection.
CD4+ T cells were expanded in vitro with antigenic peptide and IL-2, using autologous CD4- cells as antigen-presenting cells.
Expanded cells were stained with MHC class II tetramers and analyzed by flow cytometry using surface markers like CD4, CD3, and CD25.

Main Results:

Tetramer-positive CD4+ T cells formed a distinct population after in vitro expansion and staining.
Tetramer-positive cells were typically CD25+ and exhibited high CD4 expression.
Comparison with irrelevant tetramers is essential to validate positive staining due to potential background variations.

Conclusions:

MHC class II tetramer staining combined with in vitro expansion provides a sensitive method for detecting antigen-specific CD4+ T cells.
This approach allows for direct visualization and analysis of rare T cell populations via flow cytometry.
Tetramer-positive cells can be sorted for further functional assays, including ELISPOT and proliferation assays, or for co-staining with other markers like FoxP3.