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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...
Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

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...
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...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

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Murine Superficial Lymph Node Surgery
04:36

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Published on: May 21, 2012

Lowering TCR expression on naive CD8+ T cells does not affect memory T-cell differentiation.

Julie Leignadier1, Julie Rooney, Jean-François Daudelin

  • 1Maisonneuve-Rosemont Hospital Research Center, University of Montreal, Montreal, Quebec, Canada.

Immunology and Cell Biology
|June 30, 2010
PubMed
Summary

Generating long-lived memory T cells for effective vaccination depends on T-cell receptor (TCR) signaling. This study reveals TCR expression levels minimally impact memory CD8(+) T cell differentiation and function.

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Area of Science:

  • Immunology
  • Cellular Biology
  • Vaccinology

Background:

  • Long-lived memory T cells are crucial for adaptive immunity and vaccine efficacy.
  • The precise factors governing memory T cell differentiation remain incompletely understood.
  • T-cell receptor (TCR) engagement is a key signal in T cell activation and fate determination.

Purpose of the Study:

  • To investigate the role of T-cell receptor (TCR) expression levels in the generation of memory CD8(+) T cells.
  • To determine if TCR signaling strength influences T cell expansion, effector function, and memory cell differentiation.

Main Methods:

  • Manipulation of TCR expression levels on naive, antigen-specific CD8(+) T cells in a murine model.
  • In vivo assessment of T cell expansion, effector function acquisition, and memory T cell generation following antigen exposure.

Main Results:

  • Antigen-specific CD8(+) T cell expansion was only minimally affected by reduced TCR expression levels.
  • Even with significantly lower TCR numbers, T cells acquired effector functions and differentiated into memory cells.
  • A threshold of TCR engagement is necessary for maximal T cell expansion, but not for differentiation.

Conclusions:

  • TCR expression levels do not significantly impede the differentiation of naive CD8(+) T cells into effector and memory T cells.
  • While a minimum TCR signal is needed for robust T cell expansion, it is not the primary driver for memory cell generation.
  • These findings refine our understanding of T cell memory formation and have implications for vaccine design.