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Related Concept Videos

T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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...
B Cell Activation and Differentiation01:24

B Cell Activation and Differentiation

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...
Cells of the Adaptive Immune Response01:23

Cells of the Adaptive Immune Response

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...
T Cell Types and Functions01:24

T Cell Types and Functions

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...
Stem Cell Niche01:26

Stem Cell Niche

The stem cell niche is the dynamic microenvironment where stem cells reside. Inside these niches, the cells may remain undifferentiated, undergo high self-renewal, or become lineage-specific progenitors. Stem cells coexist with other niche cells, such as stromal cells. They also interact closely with the ECM. Cell-cell and cell-matrix communication occur via adhesion molecules or soluble factors that signal the stem cells and determine their fate. Stromal cells also provide survival signals to...
Antigen Presenting Cells01:22

Antigen Presenting Cells

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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Related Experiment Video

Updated: Jun 26, 2026

An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets
09:09

An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets

Published on: April 18, 2016

Dendritic cell homeostasis.

Miriam Merad1, Markus G Manz

  • 1Department of Gene and Cell Medicine, Mount Sinai School of Medicine, New York, NY 10029, USA. miriam.merad@mssm.edu

Blood
|January 30, 2009
PubMed
Summary
This summary is machine-generated.

Dendritic cells (DCs), crucial for adaptive immunity, maintain self-tolerance and initiate immune responses. Understanding their in vivo homeostasis and maintenance is key for treating DC malignancies and transplant rejection.

More Related Videos

Study of Dendritic Cell Development by Short Hairpin RNA-Mediated Gene Knockdown in a Hematopoietic Stem and Progenitor Cell Line In vitro
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Study of Dendritic Cell Development by Short Hairpin RNA-Mediated Gene Knockdown in a Hematopoietic Stem and Progenitor Cell Line In vitro

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A Simple and Efficient Method for Testing Immunomodulatory Agents for Generation of Tolerogenic Dendritic Cells from Human CD14+ Monocytes
11:34

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

Published on: April 11, 2025

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Last Updated: Jun 26, 2026

An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets
09:09

An Efficient and High Yield Method for Isolation of Mouse Dendritic Cell Subsets

Published on: April 18, 2016

Study of Dendritic Cell Development by Short Hairpin RNA-Mediated Gene Knockdown in a Hematopoietic Stem and Progenitor Cell Line In vitro
06:12

Study of Dendritic Cell Development by Short Hairpin RNA-Mediated Gene Knockdown in a Hematopoietic Stem and Progenitor Cell Line In vitro

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A Simple and Efficient Method for Testing Immunomodulatory Agents for Generation of Tolerogenic Dendritic Cells from Human CD14+ Monocytes
11:34

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

Published on: April 11, 2025

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Dendritic cells (DCs) are rare hematopoietic cells vital for adaptive immunity.
  • DCs initiate immune responses, maintain self-tolerance, and are distributed throughout the body.
  • DC homeostasis relies on replenishment from progenitors, monocytes, or tissue-resident cells.

Purpose of the Study:

  • To review current knowledge on dendritic cell (DC) progenitors, cytokines, and transcription factors.
  • To present an emerging concept of in vivo DC homeostasis under steady-state and inflammatory conditions.
  • To explore the implications of DC maintenance mechanisms for understanding DC malignancies and post-transplant immunity.

Main Methods:

  • Literature review integrating recent findings on DC biology.
  • Synthesis of data on DC progenitors, cytokines, and transcription factors.
  • Conceptual framework development for DC homeostasis.

Main Results:

  • DCs are essential for initiating adaptive immune responses and maintaining self-tolerance.
  • DC populations are sustained through complex homeostatic mechanisms involving various cell sources and regulatory factors.
  • Understanding these mechanisms offers insights into DC-related pathologies and immune interventions.

Conclusions:

  • DC homeostasis is a dynamic process influenced by progenitors, cytokines, and transcription factors.
  • Knowledge of DC maintenance is crucial for advancing therapies for DC malignancies and managing post-transplant immune responses.
  • Further research into DC biology can lead to improved immunotherapies and transplantation outcomes.