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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...
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...
Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...
Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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,...
Lymphoid Cells and Tissues01:18

Lymphoid Cells and Tissues

Lymphoid cells and tissues are integral to the immune system, which is crucial in maintaining our body's defense against harmful pathogens. They form the building blocks of lymphoid organs, which include the spleen, thymus, and lymph nodes.
Lymphoid cells consist of various types of immune system cells. These include B and T lymphocytes, which are responsible for producing antibodies and killing infected cells, respectively. Dendritic cells act as messengers between the innate and adaptive...
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...

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Related Experiment Video

Updated: Jul 1, 2026

Mouse Na&#239;ve 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

Phenotype and function of human T lymphocyte subsets: consensus and issues.

Victor Appay1, Rene A W van Lier, Federica Sallusto

  • 1Cellular Immunology Laboratory, INSERM U543, Avenir Group, Hôpital Pitié-Salpêtrière, Université Pierre et Marie Curie-Paris6, 75013 Paris, France. appay@chups.jussieu.fr

Cytometry. Part a : the Journal of the International Society for Analytical Cytology
|September 12, 2008
PubMed
Summary

Recent research on human T cell subsets has raised more questions than answers regarding their function and differentiation. This review highlights key areas of consensus and discord in T cell heterogeneity, phenotype-function relationships, and differentiation pathways.

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Generation of Human Alloantigen-specific T Cells from Peripheral Blood
09:47

Generation of Human Alloantigen-specific T Cells from Peripheral Blood

Published on: November 21, 2014

Related Experiment Videos

Last Updated: Jul 1, 2026

Mouse Na&#239;ve 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

Generation of Human Alloantigen-specific T Cells from Peripheral Blood
09:47

Generation of Human Alloantigen-specific T Cells from Peripheral Blood

Published on: November 21, 2014

Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Extensive research has focused on characterizing human T cell subpopulations, their functions, and differentiation pathways in immune responses.
  • Despite significant effort, many questions remain unresolved regarding T cell subset behavior and roles.

Purpose of the Study:

  • To clarify issues surrounding the function and differentiation of T cell subsets.
  • To present points of consensus and discord highlighted at the MASIR 2008 conference session on T cell subsets.

Main Methods:

  • Review of presented work from the MASIR 2008 conference session dedicated to T cell subsets.
  • Discussion of key topics including T cell heterogeneity, phenotype-function relationships, and differentiation pathways.

Main Results:

  • Highlighted heterogeneity of T cell subpopulations in response to different pathogens.
  • Explored the complex relationship between T cell phenotype and function.
  • Discussed various proposed pathways for T cell differentiation.

Conclusions:

  • Significant challenges and limitations persist in achieving general agreement on T cell subset characterization.
  • Further research is needed to resolve discrepancies and fully understand T cell subset dynamics in immunity.