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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.
Naive T cells that have not yet encountered an antigen express two primary CD...
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Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Overview
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T Cell Types and Functions01:24

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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

Cytotoxic T Cells-mediated Immune Response

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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.
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...
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Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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The T and B lymphocytes of the adaptive immune system develop from common lymphoid progenitor cells in the bone marrow. These progenitors give rise to precursors that eventually develop into both T and B lymphocytes. As these precursors mature, they gain the ability to detect and respond to foreign antigens in the body, a process known as immunocompetence. Additionally, these precursors acquire self-tolerance, a process that ensures they do not react to self-antigens. This intricate system...
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B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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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.
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...
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Related Experiment Video

Updated: Mar 8, 2026

Flow Cytometric Analysis of Lymphocyte Infiltration in Central Nervous System during Experimental Autoimmune Encephalomyelitis
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T cell responses in the central nervous system.

Thomas Korn1,2, Axel Kallies3,4

  • 1Klinikum Rechts der Isar, Department of Neurology, Technische Universität München, Ismaninger Strasse 22, 81675 Munich, Germany.

Nature Reviews. Immunology
|February 1, 2017
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Summary

T cells play a dual role in the central nervous system (CNS), aiding immune surveillance but also causing pathology. This review explores T cell priming and CNS recruitment mechanisms, including CD4+, CD8+, and regulatory T cells.

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Isolating Central Nervous System Tissues and Associated Meninges for the Downstream Analysis of Immune cells
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Isolating Central Nervous System Tissues and Associated Meninges for the Downstream Analysis of Immune cells

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Area of Science:

  • Neuroimmunology
  • T cell immunology
  • Central Nervous System (CNS) research

Background:

  • T cells are crucial for CNS immune surveillance but can cause severe immunopathology during viral infections and autoimmunity.
  • Understanding T cell priming and CNS recruitment is vital, especially with recent discoveries of CNS lymphatic drainage.
  • Tissue-resident memory T cells are recognized as a key component of CNS host defense.

Purpose of the Study:

  • To review the primary mechanisms governing the priming and recruitment of T cells to the CNS.
  • To discuss the roles of CD4+ T cells, CD8+ T cells, and regulatory T cells in CNS immunity.
  • To examine the plasticity of T cell responses within the CNS, particularly in viral infection and autoimmune contexts.

Main Methods:

  • Literature review of existing research on T cell immunology and neuroimmunology.
  • Synthesis of findings related to T cell priming and migration to the CNS.
  • Analysis of studies focusing on T cell plasticity in CNS viral infections and autoimmunity.

Main Results:

  • Detailed overview of T cell priming mechanisms in the context of CNS surveillance and pathology.
  • Elucidation of pathways involved in the recruitment of CD4+, CD8+, and regulatory T cells to the CNS.
  • Highlighting the significance of CNS lymphatic drainage and tissue-resident memory T cells.

Conclusions:

  • T cell priming and CNS recruitment involve complex, partially understood mechanisms.
  • The plasticity of T cell responses is critical for managing CNS viral infections and autoimmunity.
  • Further research into these mechanisms is essential for developing therapeutic strategies for neurological disorders.