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Related Concept Videos

T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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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.
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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.
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Cells of the Adaptive Immune Response01:23

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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...
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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.
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Special Features of Adaptive Immunity01:20

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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.
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Related Experiment Video

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Generation of Human Alloantigen-specific T Cells from Peripheral Blood
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Generation of Human Alloantigen-specific T Cells from Peripheral Blood

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I spy alloreactive T cells.

Maria-Luisa Alegre1

  • 1Department of Medicine, University of Chicago, Chicago, IL 60637, USA. malegre@midway.uchicago.edu.

Science Translational Medicine
|January 30, 2015
PubMed
Summary
This summary is machine-generated.

High-throughput sequencing tracked T cells in kidney transplant patients. This revealed that clonal deletion is key to developing transplantation tolerance.

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Area of Science:

  • Immunology
  • Transplantation Science
  • Genomics

Background:

  • Kidney transplantation is a vital treatment for end-stage renal disease.
  • Understanding the mechanisms of immune tolerance is crucial for improving transplant outcomes.
  • Alloreactive T cells pose a significant challenge to long-term graft survival.

Purpose of the Study:

  • To investigate the behavior of alloreactive T cells after kidney transplantation.
  • To identify the immunological mechanisms underlying transplantation tolerance.
  • To enable longitudinal tracking of T cell populations in transplant recipients.

Main Methods:

  • Employed high-throughput sequencing of the T cell receptor Vβ CDR3 region.
  • Performed longitudinal monitoring of T cell populations in kidney transplant patients.
  • Analyzed T cell repertoire dynamics to understand immune responses.

Main Results:

  • Successfully tracked alloreactive T cells over time in kidney transplant recipients.
  • Observed significant clonal deletion of alloreactive T cells.
  • Demonstrated a correlation between clonal deletion and the development of immune tolerance.

Conclusions:

  • Clonal deletion is a primary mechanism contributing to transplantation tolerance.
  • High-throughput sequencing provides a powerful tool for studying immune responses in transplantation.
  • These findings offer insights into strategies for enhancing graft acceptance.