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Related Concept Videos

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...
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...
Primary Lymphoid Organs01:16

Primary Lymphoid Organs

Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...
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...
Cellular Differentiation00:57

Cellular Differentiation

How does a complex organism such as a human develop from a single cell? It all starts from a single fertilized egg which gives rise to a vast array of cell types, such as nerve cells, muscle cells, and epithelial cells that characterize the adult? Throughout development and adulthood, cellular differentiation leads cells to assume their final morphology and physiology. Differentiation is the process by which unspecialized cells become specialized to carry out distinct functions.
A zygote is a...

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Related Experiment Video

Updated: May 24, 2026

Preparation and Applications of Organotypic Thymic Slice Cultures
10:10

Preparation and Applications of Organotypic Thymic Slice Cultures

Published on: August 6, 2016

T cell differentiation in the thymus.

C E Grossi1, A Favre, M Giunta

  • 1Department of Anatomy and Biochemistry, University of Genova, Genova, Italy.

Cytotechnology
|February 24, 2012
PubMed
Summary
This summary is machine-generated.

Researchers identified a new integrin molecule crucial for T cell development. This molecule mediates interactions between developing T cells and thymic epithelial cells, impacting T cell maturation and selection within the thymus.

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Related Experiment Videos

Last Updated: May 24, 2026

Preparation and Applications of Organotypic Thymic Slice Cultures
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Preparation and Applications of Organotypic Thymic Slice Cultures

Published on: August 6, 2016

Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays
08:56

Characterization of Thymic Settling Progenitors in the Mouse Embryo Using In Vivo and In Vitro Assays

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Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets
07:12

Mouse Naïve CD4+ T Cell Isolation and In vitro Differentiation into T Cell Subsets

Published on: April 16, 2015

Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • T lymphocytes (T cells) originate in the thymus and mature into functional cells before migrating to peripheral organs.
  • Thymocyte development involves stringent selection processes, with over 95% of developing T cells undergoing apoptosis within the thymus.
  • Key selection events, positive and negative selection, are critical for establishing self-MHC restriction and eliminating autoreactive cells, respectively.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying cell-to-cell interactions during thymocyte development.
  • To identify novel molecules involved in the communication between developing thymocytes and the thymic microenvironment.
  • To characterize a newly discovered integrin molecule's role in thymocyte-thymic epithelial cell interactions.

Main Methods:

  • Characterization of cell-to-cell interactions within the thymus.
  • Identification and analysis of adhesion molecules mediating thymocyte maturation and selection.
  • Description of a novel integrin involved in thymocyte-thymic epithelial cell adhesion.

Main Results:

  • Adhesion molecules play a vital role in thymocyte maturation, selection, activation, and homing of mature T cells.
  • Cell-to-cell contacts, mediated by receptor/ligand interactions, are essential for thymocyte selection processes.
  • A novel integrin has been identified that is involved in the interactions between thymocytes and thymic epithelial cells.

Conclusions:

  • The identified integrin is a key player in mediating thymocyte-thymic epithelial cell interactions.
  • This novel molecule likely contributes to the complex processes of T cell maturation and selection within the thymus.
  • Understanding these interactions is crucial for comprehending T cell repertoire development and immune system function.