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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...
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...
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,...
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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Murine Superficial Lymph Node Surgery
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Different T cell receptor signals determine CD8+ memory versus effector development.

Emma Teixeiro1, Mark A Daniels, Sara E Hamilton

  • 1Experimental Transplantation Immunology, Department of Biomedicine, University Hospital-Basel, Hebelstrasse 20, 4031-Basel, Switzerland. teixeiropernase@missouri.edu

Science (New York, N.Y.)
|January 24, 2009
PubMed
Summary
This summary is machine-generated.

Mutations in the T cell receptor beta transmembrane domain (betaTMD) disrupt CD8+ memory T cell formation and function. This suggests distinct T cell receptor signaling pathways regulate effector versus memory T cell differentiation.

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Area of Science:

  • Immunology
  • Cell Biology
  • Molecular Biology

Background:

  • Naïve CD8+ T cells differentiate into effector and memory cells after infection to establish adaptive immunity.
  • The precise role of the T cell receptor (TCR) in regulating CD8+ memory T cell development is not fully understood.

Purpose of the Study:

  • To investigate how the TCR regulates the differentiation of CD8+ T cells into long-lived memory cells.
  • To determine the impact of specific TCR mutations on memory T cell development and function.

Main Methods:

  • Utilized a mutant TCR transgenic mouse model with point mutations in the TCR beta transmembrane domain (betaTMD).
  • Assessed CD8+ T cell differentiation, effector function, and memory cell development post-infection.
  • Analyzed TCR polarization and nuclear factor kappaB (NF-κB) signaling at the immunological synapse.

Main Results:

  • Point mutations in the betaTMD of the TCR impaired CD8+ memory T cell development and function.
  • These mutations did not affect the primary effector T cell responses.
  • Mutant T cells showed defects in TCR polarization and NF-κB signaling organization within the immunological synapse.

Conclusions:

  • CD8+ T cell effector and memory fates are separable, regulated by differential TCR signaling.
  • The TCR beta transmembrane domain plays a critical role in establishing long-lived CD8+ memory T cells.
  • TCR signaling dynamics at the immunological synapse are crucial for memory T cell programming.