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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 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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Cytotoxic T Cells-mediated Immune Response01:27

Cytotoxic T Cells-mediated Immune Response

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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.
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...
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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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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.
Naive T cells that have not yet encountered an antigen express two primary CD...
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Related Experiment Video

Updated: Jul 17, 2025

Preparation of Single-Cell Suspension of Mouse Thymic Epithelial Cells and Staining of Intracellular Molecules for Flow Cytometric AnalysisMechanisms
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Preparation of Single-Cell Suspension of Mouse Thymic Epithelial Cells and Staining of Intracellular Molecules for Flow Cytometric AnalysisMechanisms

Published on: July 26, 2024

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Thymic mimetic cells function beyond self-tolerance.

Tal Givony1, Dena Leshkowitz2, Diana Del Castillo3

  • 1Department of Immunology and Regenerative Biology, Weizmann Institute of Science, Rehovot, Israel.

Nature
|September 6, 2023
PubMed
Summary
This summary is machine-generated.

Thymic epithelial cells (TECs) exhibit remarkable diversity. This study reveals specialized TEC subsets crucial for T cell development, immune tolerance, and thymus homeostasis, highlighting their roles in regulating cellularity and generating specific immune responses.

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Area of Science:

  • Immunology
  • Cell Biology
  • Developmental Biology

Background:

  • T cell development in the thymus is essential for immunity against pathogens.
  • Thymic epithelial cells (TECs) are critical for T cell education, involving positive and negative selection.
  • Previous research indicated heterogeneity among TECs, but a comprehensive understanding was lacking.

Purpose of the Study:

  • To investigate the functional and developmental diversity of TECs in mice using multiomic analysis.
  • To create a detailed atlas of the TEC compartment based on transcriptional states and chromatin landscapes.
  • To elucidate the specific roles of identified unconventional TEC subsets.

Main Methods:

  • Multiomic analysis (transcriptional and chromatin landscape) of mouse thymic epithelial cells.
  • Identification and characterization of distinct TEC subsets.
  • Functional studies focusing on endocrine and microfold TEC populations.

Main Results:

  • Revealed unconventional TEC subsets resembling parenchymal cell types, including endocrine cells, microfold cells, and myocytes.
  • Demonstrated that endocrine TECs require Insm1 for development and maintain thymus cellularity via ghrelin.
  • Showed that microfold TECs require Spib for development and are essential for thymic IgA+ plasma cell generation.

Conclusions:

  • Medullary TECs possess the capacity to differentiate into diverse, functionally distinct cell types.
  • These specialized TECs contribute to central tolerance induction and regulate the homeostasis of other thymus-resident cells.
  • The findings provide a detailed atlas of TEC heterogeneity and highlight specific molecular pathways governing their function.