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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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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-mediated Immune Response01:27

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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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B Cell Activation and Differentiation01:24

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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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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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Generation of Human Alloantigen-specific T Cells from Peripheral Blood
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T-cells play the classics with a different spin.

Michael L Dustin1

  • 1Kennedy Institute of Rheumatology, Nuffield Department of Orthopaedics, Rheumatology and Musculoskeletal Sciences, University of Oxford, Headington OX3 7FY, United Kingdom; Skirball Institute of Biomolecular Medicine, New York University School of Medicine, New York, NY 10016 michael.dustin@kennedy.ox.ac.uk.

Molecular Biology of the Cell
|May 31, 2014
PubMed
Summary
This summary is machine-generated.

Immune cells utilize familiar cell biology pathways in novel ways, such as using intraflagellar transport proteins and endosomal sorting complexes required for transport (ESCRTs) to form the immunological synapse and communicate.

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Area of Science:

  • Cell Biology
  • Immunology
  • Molecular Biology

Background:

  • The immune system employs fundamental cell biology mechanisms, but with unique organizational and functional adaptations.
  • Classical cell biology pathways are being re-examined in the context of immune cell function, revealing novel roles.

Purpose of the Study:

  • To highlight recent discoveries demonstrating unconventional uses of well-known cellular machinery within the immune system.
  • To explore the implications of these findings for understanding immune cell communication and function.

Main Methods:

  • Investigating the role of intraflagellar transport proteins and hedgehog signaling in the immune synapse.
  • Analyzing the function of the β2 integrin subfamily in forming stable adhesion rings in lymphocytes.
  • Examining the use of endosomal sorting complexes required for transport (ESCRTs) by T-cells at the plasma membrane.

Main Results:

  • Intraflagellar transport proteins and hedgehog signaling contribute to the immune synapse, despite the absence of primary cilia in immune cells.
  • Lymphocyte-specific β2 integrins form stable adhesion rings with mobile ligands, a key feature of the immunological synapse.
  • T-cells utilize ESCRT machinery at the plasma membrane to generate microvesicles enriched with T-cell receptors, potentially facilitating novel cell-cell communication.

Conclusions:

  • Classical cell biology pathways, including ESCRT and components typically found in cilia, are repurposed by immune cells for unique functions.
  • These findings reveal novel mechanisms of immune cell interaction and communication, expanding our understanding of cell biology.
  • The study underscores the immune system as a valuable model for discovering new aspects of fundamental cell biology.