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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...

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Cell-mediated Immune Responses

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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.
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Cytotoxic T Cells-mediated Immune Response

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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...

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Related Experiment Video

Updated: Jul 3, 2026

In Vivo Augmentation of Gut-Homing Regulatory T Cell Induction

In Vivo Augmentation of Gut-Homing Regulatory T Cell Induction

Published on: January 22, 2020

CXCR4-CCR5: a couple modulating T cell functions.

Rita Lucia Contento¹, Barbara Molon, Cedric Boularan

¹Venetian Institute of Molecular Medicine, via Orus 2, 35129 Padua, Italy.

Proceedings of the National Academy of Sciences of the United States of America

|July 18, 2008

Summary

This summary is machine-generated.

Chemokine receptors CCR5 and CXCR4 cooperate within the immunological synapse to enhance T cell activation. This physical interaction between chemokine receptors fine-tunes immune responses and T lymphocyte functions.

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Last Updated: Jul 3, 2026

In Vivo Augmentation of Gut-Homing Regulatory T Cell Induction

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Published on: January 22, 2020

Retroviral Overexpression of CXCR4 on Murine B-1a Cells and Adoptive Transfer for Targeted B-1a Cell Migration to the Bone Marrow and IgM Production

Retroviral Overexpression of CXCR4 on Murine B-1a Cells and Adoptive Transfer for Targeted B-1a Cell Migration to the Bone Marrow and IgM Production

Published on: May 31, 2020

Area of Science:

Immunology
Cell Biology
Molecular Biology

Background:

Chemokines and their receptors are crucial for leukocyte migration.
Chemokine receptors possess versatile functions beyond chemotaxis, fine-tuning immune responses.
CCR5 and CXCR4 are recruited to the immunological synapse during T cell activation, providing costimulatory signals.

Purpose of the Study:

To elucidate the molecular mechanisms behind chemokine receptor signaling versatility.
To investigate the functional interaction between CXCR4 and CCR5 in modulating T lymphocyte responses.
To understand how chemokine receptor cooperation impacts T cell costimulation.

Main Methods:

Investigating the functional interaction between CXCR4 and CCR5.
Assessing chemokine-induced T cell costimulation at the immunological synapse.
Examining the physical association of CCR5 and CXCR4 in signaling complexes.

Main Results:

Simultaneous expression and cooperation of CCR5 and CXCR4 are essential for chemokine-induced T cell costimulation.
A physical association between CCR5 and CXCR4 forms a signaling complex.
This complex activates distinct T cell functions, modulating T lymphocyte responses.

Conclusions:

Cooperation between chemokine receptors, specifically CCR5 and CXCR4, is vital for T cell costimulation.
Physical association of these receptors forms a signaling complex that dictates specific T cell functions.
Receptor cooperation is a key mechanism underlying the functional plasticity of chemokines in immune regulation.