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Related Concept Videos

Primary Lymphoid Organs01:16

Primary Lymphoid Organs

Primary lymphoid organs are pivotal in the formation, development, and maturation of lymphocytes, the white blood cells that serve as the backbone of our immune system. This crucial function underscores their fundamental role in maintaining our overall health and immunity. The two primary lymphoid organs of prime importance are the red bone marrow and the thymus.
The red bone marrow is a soft, spongy tissue nestled in the interior of long bones such as the humerus and femur. It is the site...
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...
Secondary Lymphoid Organs01:15

Secondary Lymphoid Organs

Secondary organs, including lymph nodes, the spleen, and mucosa-associated lymphoid tissue (MALT), work harmoniously to protect us from disease and infection.
The spleen is a vital organ in the lymphatic system, nestled in the upper left side of the abdomen. It is composed of two primary regions: the red pulp and the white pulp, each having distinct functions. The red pulp performs a significant role in blood filtration. It efficiently purges the blood of old or damaged red blood cells and...
Antigen Presenting Cells01:22

Antigen Presenting Cells

The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
T cells require the help of antigen-presenting cells (APCs), which process foreign antigens into smaller fragments that can be recognized by T cells. These APCs are highly specialized cells that efficiently internalize antigens...
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...
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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Related Experiment Video

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Preparation of Single-Cell Suspension of Mouse Thymic Epithelial Cells and Staining of Intracellular Molecules for Flow Cytometric Analysis
09:41

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

Published on: July 26, 2024

AIRE in the thymus and beyond.

James M Gardner1, Anne L Fletcher, Mark S Anderson

  • 1Diabetes Center and the Department of Medicine, University of California, San Francisco, CA 94143-0540, USA.

Current Opinion in Immunology
|October 17, 2009
PubMed
Summary

The Autoimmune Regulator (Aire) gene is crucial for immune self-tolerance by promoting tissue-specific antigen transcription, especially in the thymus. Defects in Aire lead to autoimmune diseases, highlighting its critical role in preventing self-attack.

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Area of Science:

  • Immunology
  • Molecular Biology
  • Genetics

Background:

  • Maintaining immunologic self-tolerance is essential to prevent autoimmune diseases.
  • The Autoimmune Regulator (Aire) gene plays a key role in establishing self-tolerance.
  • Aire facilitates the expression of tissue-specific antigens (TSAs) primarily in the thymus.

Purpose of the Study:

  • To review recent advancements in understanding Aire's function in immune tolerance.
  • To explore the cellular and molecular mechanisms underlying Aire's control of self-tolerance.
  • To discuss the significance of Aire expression in both the thymus and peripheral lymphoid organs.

Main Methods:

  • Literature review of studies on Aire gene function.
  • Analysis of cellular and molecular pathways regulated by Aire.
  • Investigation of Aire and TSA expression in extrathymic tissues.

Main Results:

  • Aire is critical for inducing transcription of numerous TSAs, particularly in the thymus.
  • Deficiency in Aire expression in patients and mice results in multi-organ autoimmune syndromes.
  • Aire and TSA expression detected in extrathymic cell populations suggests a broader role in tolerance.

Conclusions:

  • Aire is a key regulator of central and potentially peripheral immune tolerance.
  • Understanding Aire's extrathymic functions may reveal new therapeutic targets for autoimmune diseases.
  • Further research into Aire's role outside the thymus is warranted to fully elucidate its contribution to self-tolerance.