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Related Concept Videos

Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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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.
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,...
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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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Cells of the Adaptive Immune Response

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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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Development of Immunocompetence01:22

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The initiation of cell-mediated immunity can be observed as early as the third month of fetal growth, with active antibody-mediated immunity following approximately one month later.
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Subsequent T...
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T Cell Types and Functions01:24

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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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Related Experiment Video

Updated: Nov 25, 2025

Adenoviral Transduction of Naive CD4 T Cells to Study Treg Differentiation
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T cell Tolerance in Early Life.

Lijun Yang1, Rong Jin1, Dan Lu2

  • 1Department of Immunology, School of Basic Medical Sciences, Peking University, NHC Key Laboratory of Medical Immunology (Peking University), Beijing, China.

Frontiers in Immunology
|December 17, 2020
PubMed
Summary

Early life T cell tolerance is crucial for preventing autoimmune and allergic diseases. Unique T cell features in umbilical cord blood may benefit transplantation.

Keywords:
T cell toleranceallogeneic hematopoietic stem cell transplantationconventional T cellsneonatal periodregulatory T cells

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Area of Science:

  • Immunology
  • Developmental Biology

Background:

  • T cell-mediated immune tolerance prevents responses to self and non-self antigens.
  • Early life immune tolerance is critical for managing diverse antigens and developing immune homeostasis.
  • Impaired early life tolerance can lead to adult allergic or autoimmune conditions.

Purpose of the Study:

  • To explore the mechanisms of T cell tolerance during the prenatal/neonatal period.
  • To understand the distinct features of early life T cells and their role in immune regulation.
  • To investigate the potential of umbilical cord blood T cells in transplantation.

Main Methods:

  • Analysis of cell-intrinsic and cell-extrinsic mechanisms governing T cell development.
  • Characterization of conventional and regulatory T cells in human umbilical cord blood.
  • Review of literature on early life immune tolerance and its clinical implications.

Main Results:

  • Prenatal/neonatal T cells possess unique features to manage a dynamic antigenic environment.
  • Mechanisms ensure tolerance to maternal, environmental, and commensal antigens while allowing pathogen response.
  • Early life tolerance deficits correlate with later-life allergic and autoimmune diseases.
  • Umbilical cord blood T cells exhibit unique properties potentially advantageous for transplantation.

Conclusions:

  • Specific cellular mechanisms establish T cell tolerance in early life, crucial for immune health.
  • Early life immune tolerance is a critical determinant of adult susceptibility to immune-mediated diseases.
  • Umbilical cord blood T cells represent a promising resource for hematological disorder treatments.