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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...

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...

Cell-mediated Immune Responses

Cell-mediated Immune Responses

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Related Experiment Video

Updated: Jul 6, 2025

Tumor Transplantation for Assessing the Dynamics of Tumor-Infiltrating CD8+ T Cells in Mice

Tumor Transplantation for Assessing the Dynamics of Tumor-Infiltrating CD8+ T Cells in Mice

Published on: June 12, 2021

T Cell Exhaustion.

Andrew Baessler^1,2, Dario A A Vignali^1,2,3

¹Department of Immunology, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania, USA;

Annual Review of Immunology

|January 2, 2024

Summary

This summary is machine-generated.

T cell exhaustion is a natural process that limits immune responses during chronic stimulation. Understanding T cell exhaustion mechanisms can help improve cancer immunotherapies.

Keywords:

cancer exhaustion immunotherapy inhibitory receptors regulation

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Published on: June 12, 2021

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In Vitro Tumor Cell Rechallenge For Predictive Evaluation of Chimeric Antigen Receptor T Cell Antitumor Function

In Vitro Tumor Cell Rechallenge For Predictive Evaluation of Chimeric Antigen Receptor T Cell Antitumor Function

Published on: February 27, 2019

Area of Science:

Immunology
Cellular Biology
Cancer Research

Background:

T cell responses require balance for pathogen defense and autoimmunity prevention.
T cell exhaustion is a regulatory mechanism limiting T cell activity during chronic antigen exposure.
Exhausted T cells display reduced function, proliferation, and altered molecular profiles.

Purpose of the Study:

To review the characteristics, drivers, and programming of T cell exhaustion.
To discuss the implications of T cell exhaustion in infection, autoimmunity, and cancer.
To explore therapeutic strategies targeting T cell exhaustion in cancer treatment.

Main Methods:

Literature review of T cell exhaustion.
Analysis of transcriptional, epigenetic, and metabolic alterations in exhausted T cells.
Discussion of clinical implications and therapeutic targeting.

Main Results:

Exhausted T cells are defined by high inhibitory receptor expression and impaired effector functions.
Chronic antigen stimulation drives the development of T cell exhaustion.
T cell exhaustion hinders effective anti-cancer immunity but can be therapeutically modulated.

Conclusions:

T cell exhaustion is a critical factor in immune regulation and disease progression.
Targeting T cell exhaustion pathways offers potential for enhancing anti-tumor immunity.
Further research into T cell exhaustion programming is crucial for developing novel cancer therapies.