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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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T Cell Types and Functions01:24

T Cell Types and Functions

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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.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
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Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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The adaptive immune system, a crucial component of the overall immune response, offers a highly specialized defense against pathogens. It involves specific cell types and features, enabling it to combat infections effectively and efficiently.
The primary cell types involved in adaptive immunity are T cells and B cells. Each type has a unique role in defending the body against pathogens. T cells are responsible for cell-mediated immunity. They identify and eliminate infected cells directly,...
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Antigen Presenting Cells01:22

Antigen Presenting Cells

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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.
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
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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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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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Related Experiment Video

Updated: Jan 2, 2026

A Simple and Efficient Method for Testing Immunomodulatory Agents for Generation of Tolerogenic Dendritic Cells from Human CD14+ Monocytes
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A Simple and Efficient Method for Testing Immunomodulatory Agents for Generation of Tolerogenic Dendritic Cells from Human CD14+ Monocytes

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Dendritic cells in tolerance induction.

Alexander H Enk1

  • 1Department of Dermatol., Univ. of Heidelberg, Vossstr. 2, D-69115 Heidelberg, Germany. alexander.enk@med.uni-heidelberg.de

Immunology Letters
|May 17, 2005
PubMed
Summary
This summary is machine-generated.

Regulatory T cells (Treg) suppress immune responses. Key Treg subsets, like Tr-1 and genuine Treg, utilize distinct mechanisms, including cytokine secretion (IL-10, TGF-beta) and cell contact, to control effector T cells.

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Development and Functional Characterization of Murine Tolerogenic Dendritic Cells
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Related Experiment Videos

Last Updated: Jan 2, 2026

A Simple and Efficient Method for Testing Immunomodulatory Agents for Generation of Tolerogenic Dendritic Cells from Human CD14+ Monocytes
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Development and Functional Characterization of Murine Tolerogenic Dendritic Cells
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Generation of Immature, Mature and Tolerogenic Dendritic Cells with Differing Metabolic Phenotypes
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Generation of Immature, Mature and Tolerogenic Dendritic Cells with Differing Metabolic Phenotypes

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Regulatory T cells (Treg) are crucial for immune homeostasis.
  • Treg cells suppress conventional effector T cell proliferation through various mechanisms.

Purpose of the Study:

  • To delineate the distinct subsets of regulatory T cells.
  • To understand the interrelations and functional properties of different Treg subtypes.

Main Methods:

  • Characterization of Treg subsets based on functional properties.
  • Identification of key cell surface markers (e.g., CD4, CD25).
  • Analysis of cytokine production profiles (IL-10, TGF-beta).

Main Results:

  • Three main groups of Treg cells are distinguished by function.
  • Tr-1 and Th-3 cells secrete IL-10 and TGF-beta to inhibit CD4+ cell proliferation.
  • Genuine Treg cells use a CD25-dependent, cell-contact mechanism to block proliferation.

Conclusions:

  • Distinct Treg subsets exhibit unique suppressive mechanisms.
  • Overlapping features exist among Treg subtypes, with regulatory cytokines being a common denominator.
  • Understanding Treg heterogeneity is vital for immune regulation research.