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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...

T Cell Types and Functions

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...

Cell-mediated Immune Responses

Cell-mediated Immune Responses

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...

Cytotoxic T Cells-mediated Immune Response

Cytotoxic T Cells-mediated Immune Response

Cytotoxic T cells are a vital component of the immune system. They have the remarkable ability to identify and target antigens on infected or abnormal cells. These antigens often originate from intracellular pathogens such as viruses or abnormal proteins cancer cells produce.
Immunological surveillance is the ability of immune cells to monitor and eliminate infected cells with intracellular pathogens, neoplastically transformed cells, and cells with non-self antigens. Cytotoxic T cells and NK...

Cells of the Adaptive Immune Response

Cells of the Adaptive Immune Response

The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...

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Related Experiment Video

Updated: Jul 14, 2026

Competitive Homing Assays to Study Gut-tropic T Cell Migration

Competitive Homing Assays to Study Gut-tropic T Cell Migration

Published on: March 1, 2011

Long-term commitment to inflammation-seeking homing in CD4+ effector cells.

Silke Jennrich¹, Boris A Ratsch, Alf Hamann

¹Charité, Campus Mitte, Experimentelle Rheumatologie, c/o Deutsches Rheumaforschungszentrum, 12200 Berlin, Germany.

Journal of Immunology (Baltimore, Md. : 1950)

|June 6, 2007

Summary

T effector cells can develop stable homing properties, with some cells retaining P-selectin ligand expression long-term. However, a significant portion remains adaptable, with homing molecule expression modulated by restimulation and environment.

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Area of Science:

Immunology
Cellular Biology
Molecular Medicine

Background:

T effector cell migration to inflammation sites is crucial for immune defense.
The stability of organ-specific homing receptor expression on T cells in vivo is not well understood.
Adhesion molecules mediate T cell trafficking, with partly tissue-specific roles.

Purpose of the Study:

To investigate the long-term stability of homing receptor expression on T effector cells in vivo.
To determine if T cells can 'memorize' their initial priming site and develop stable organ-specific homing.
To explore factors influencing the stability of P-selectin ligand expression on T cells.

Main Methods:

Adoptive transfer of CD4(+) T cells sorted for P-selectin ligand expression.
Analysis of long-term P-selectin ligand expression on transferred T cells.
Assessment of P-selectin ligand re-expression upon antigen challenge in different environments.
Evaluation of the impact of repeated stimulation and IL-12 on phenotype stability.

Main Results:

Approximately one-third of effector T cells maintained long-term P-selectin ligand expression.
Lost P-selectin ligands could be re-expressed upon antigen challenge, primarily within peripheral lymph nodes (pLNs).
Repeated stimulation with IL-12 increased the frequency of stable P-selectin ligand expressers, suggesting phenotype fixation.
Isolated P-selectin ligand-positive memory T cells showed the highest frequency of long-term expression.
Tissue-specific environments were not essential for maintaining P-selectin ligand expression in a subfraction of cells.

Conclusions:

Selectin ligand expression can become clonally imprinted on T cells under specific conditions, leading to stable homing phenotypes.
A major fraction of T cells retains flexibility, with their homing molecule expression being environmentally modulated upon restimulation.
These findings provide insights into the mechanisms governing T cell trafficking and memory formation in immune responses.