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Related Concept Videos

T Cell Types and Functions01:24

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...
T Cell Activation and Clonal Selection01:22

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...
Maintenance of the ES Cell State01:14

Maintenance of the ES Cell State

The cells of the blastocyst inner cell mass only remain pluripotent for a short time. This state of pluripotency and self-renewal can be maintained in embryonic stem (ES) cell culture by adding specific chemicals or growth factors to ensure the cells can continue dividing and later differentiate into different cell types. In some cases, the cells are grown on a feeder layer of differentiated cells, which provides the growth factors and extracellular matrix components necessary for stem cell...
Regulation of Hematopoietic Stem Cells01:01

Regulation of Hematopoietic Stem Cells

All blood and immune cells are produced from the multipotent hematopoietic stem cells (HSCs) by the process of hematopoiesis. However, they all have a limited life span. In addition, many are depleted in immune surveillance or combatting an injury or infection. This makes blood one of the most regenerative tissues. Hematopoiesis helps replenish these blood and immune cells, restoring the body's normal functioning. However, overproduction of blood and immune cells can make them cancerous or...
B Cell Activation and Differentiation01:24

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...
Multipotency of Hematopoietic Stem Cells01:19

Multipotency of Hematopoietic Stem Cells

The hematopoietic stem cells or HSCs are multipotent, meaning they can differentiate and give rise to all blood and immune cells. HSCs are maintained in the quiescent stage until an external stimulus initiates their differentiation. The multipotent HSCs exist as two heterogeneous populations, long-term repopulating cells (LTRC) and short-term repopulating cells (STRC). The two HSC populations have different surface markers or receptors and are classified based on quiescence and long-term...

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Tumor Transplantation for Assessing the Dynamics of Tumor-Infiltrating CD8+ T Cells in Mice
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Published on: June 12, 2021

T Cell Exhaustion as a Regulated Differentiation Programme.

Marc Veldhoen1,2, Cristina Ferreira1

  • 1Gulbenkian Institute for Molecular Medicine, Lisbon, Portugal.

European Journal of Immunology
|June 17, 2026
PubMed
Summary
This summary is machine-generated.

T cell exhaustion is a structured differentiation process, not fatigue. Immune checkpoint blockade expands progenitor exhausted cells (TPEX), aiding therapeutic strategies for chronic infections and tumors.

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Published on: June 12, 2021

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Adenoviral Transduction of Naive CD4 T Cells to Study Treg Differentiation
15:33

Adenoviral Transduction of Naive CD4 T Cells to Study Treg Differentiation

Published on: August 13, 2013

Area of Science:

  • Immunology
  • Cellular Biology
  • Cancer Research

Background:

  • T cell exhaustion is traditionally viewed as cellular fatigue.
  • Recent evidence suggests it's an antigen-driven differentiation program.
  • Understanding this process is crucial for treating chronic infections and cancer.

Purpose of the Study:

  • To reframe T cell exhaustion as a differentiation process.
  • To elucidate the hierarchical states of T cell differentiation.
  • To clarify the mechanism of action for immune checkpoint blockade.

Main Methods:

  • Analysis of T cell differentiation states.
  • Investigation of epigenetic architecture.
  • Integration of data from chronic infection, tumor immunology, and tissue adaptation models.

Main Results:

  • CD8+ T cells differentiate into progenitor exhausted (TPEX), intermediate (TEXint), and terminally exhausted (TEX term) states.
  • TPEX cells retain self-renewal and responsiveness to immune checkpoint blockade.
  • Exhaustion shares mechanisms with tissue-resident memory (TRM) cells but are distinct entities.

Conclusions:

  • T cell exhaustion is a hierarchical differentiation program crucial for immune surveillance and limiting tissue damage.
  • Immune checkpoint blockade primarily expands TPEX cells.
  • This framework reframes therapeutic strategies for antigen-driven diseases.