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Related Concept Videos

T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

939
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...
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T Cell Types and Functions01:24

T Cell Types and Functions

1.1K
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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Related Experiment Video

Updated: Aug 2, 2025

Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist
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CTLA4 prohibits T cells from cross-dressing.

Noémie Paillon1,2,3, Claire Hivroz1,2

  • 1Institut Curie , Paris Sciences et Lettres University, Inserm U932, Immunity and Cancer , Paris, France.

The Journal of Experimental Medicine
|April 18, 2023
PubMed
Summary
This summary is machine-generated.

The inhibitory protein CTLA4 internalizes B7 molecules from antigen-presenting cells, preventing T cell interactions. This mechanism helps regulate immune responses by limiting T-T cell stimulation.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • T cell activation requires co-stimulatory signals, typically mediated by B7 molecules on antigen-presenting cells (APCs).
  • Cytotoxic T-lymphocyte-associated protein 4 (CTLA4) is a key immune checkpoint inhibitor that negatively regulates T cell responses.

Purpose of the Study:

  • To investigate the mechanism by which CTLA4 regulates T cell co-stimulation.
  • To elucidate the role of CTLA4 in controlling T-T cell interactions.

Main Methods:

  • Utilized advanced microscopy techniques to observe protein internalization.
  • Employed immunological assays to assess T cell activation and interaction.

Main Results:

  • CTLA4 was found to internalize B7 molecules from APCs in a process termed "gnawing" by T cells.
  • This internalization by CTLA4 effectively prevented subsequent stimulatory interactions between T cells.

Conclusions:

  • CTLA4 plays a crucial role in immune homeostasis by actively removing co-stimulatory ligands.
  • This mechanism provides a novel understanding of immune checkpoint regulation and T cell inhibition.