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Related Concept Videos

T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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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.
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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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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.
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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.
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Antigen Presenting Cells01:22

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The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
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Spatial and Temporal Control of T Cell Activation Using a Photoactivatable Agonist
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Tapping out a mechanical code for T cell triggering.

Michael L Dustin1, Lance C Kam2

  • 1Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology, and Musculoskelatal Sciences, The University of Oxford, Oxford OX3 7FY, England, UK Skirball Institute of Biomolecular Medicine, New York University School of Medicine, New York, NY 10016 michael.dustin@kennedy.ox.ac.uk.

The Journal of Cell Biology
|June 9, 2016
PubMed
Summary
This summary is machine-generated.

Mechanical forces are crucial for T cell receptor (TCR) signaling. Research shows actin is essential for TCR force generation, and external forces can activate T cells.

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A TIRF Microscopy Technique for Real-time, Simultaneous Imaging of the TCR and its Associated Signaling Proteins
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Area of Science:

  • Immunology
  • Cell Biology
  • Biophysics

Background:

  • T cell activation is critical for adaptive immunity.
  • The role of mechanical forces in T cell receptor (TCR) signaling is an emerging area of research.

Purpose of the Study:

  • To investigate the role of mechanical forces in TCR signal transduction.
  • To determine if actin is required for force generation at the TCR.
  • To explore whether exogenous forces can trigger T cell activation.

Main Methods:

  • Utilized techniques to measure force generation at the TCR.
  • Investigated the involvement of the actin cytoskeleton in TCR-mediated force application.
  • Applied exogenous forces to T cells to assess activation.

Main Results:

  • Actin cytoskeleton is necessary for T cells to generate forces at the TCR.
  • Exogenous application of force can mimic cytoskeletal forces.
  • Applied forces are sufficient to trigger T cell activation.

Conclusions:

  • Mechanical forces are integral to TCR signal transduction.
  • Actin-dependent force generation is a key mechanism in T cell activation.
  • External forces can be leveraged to modulate T cell responses.