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Related Concept Videos

Special Features of Adaptive Immunity01:20

Special Features of Adaptive Immunity

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,...
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...
Introduction to Innate and Adaptive Immunity01:21

Introduction to Innate and Adaptive Immunity

The human immune system is a complex defense mechanism that protects the body from harmful pathogens and foreign substances. It comprises two crucial components: innate and adaptive immunity.
Innate immunity is the body's natural, nonspecific defense system that acts quickly to protect against pathogens. It incorporates physical barriers like skin and mucous membranes and cellular elements such as phagocytes and natural killer cells. This part of our immune system provides an immediate,...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
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...
Diversity of Antigen Receptors01:28

Diversity of Antigen Receptors

Antigen receptors are essential components of the immune system crucial in defending the body against foreign invaders. These receptors are present on the surface of B and T cells, enabling them to recognize antigens and mount an appropriate immune response.
Before encountering any antigen, lymphocytes express these receptors. On B cells, the antigen receptor is a membrane-bound antibody molecule called BCR; on T cells, it is a T cell receptor or TCR. B and T cell receptors are composed of two...

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Related Experiment Video

Updated: May 18, 2026

Interrogating Individual Autoreactive Germinal Centers by Photoactivation in a Mixed Chimeric Model of Autoimmunity
11:12

Interrogating Individual Autoreactive Germinal Centers by Photoactivation in a Mixed Chimeric Model of Autoimmunity

Published on: April 11, 2019

Rethinking the origins and functions of adaptive immunity.

Derick Okwan-Duodu1, Erik A Sperling2, Edgar G Engleman1

  • 1Department of Pathology, Stanford University, Stanford, CA, USA.

Trends in Immunology
|May 16, 2026
PubMed
Summary
This summary is machine-generated.

The adaptive immune system (AIS) is reframed as a homeostatic regulatory circuit, not just defense. It manages intrinsic cellular dangers from mitochondrial transfer, integrating tissue balance and immune responses.

Keywords:
constitutive dangerhorizontal mitochondria transferimmunitytissue homeostasistolerance

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Last Updated: May 18, 2026

Interrogating Individual Autoreactive Germinal Centers by Photoactivation in a Mixed Chimeric Model of Autoimmunity
11:12

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Generation of Human Alloantigen-specific T Cells from Peripheral Blood
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Unraveling Key Players of Humoral Immunity: Advanced and Optimized Lymphocyte Isolation Protocol from Murine Peyer's Patches
08:25

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Published on: November 21, 2018

Area of Science:

  • Immunology
  • Cell Biology
  • Evolutionary Biology

Background:

  • The adaptive immune system (AIS) is traditionally viewed as a vertebrate defense mechanism against pathogens.
  • However, its regulatory and homeostatic functions suggest a broader role beyond antimicrobial warfare.
  • Mitochondrial horizontal transfer maintains tissue homeostasis but can trigger immune responses.

Purpose of the Study:

  • To propose a new perspective on the adaptive immune system (AIS).
  • To reframe the AIS as a constitutive danger management network.
  • To integrate tissue homeostasis, metabolic surveillance, immune tolerance, and defense.

Main Methods:

  • Conceptual analysis and synthesis of existing research on the immune system and mitochondria.
  • Theoretical framework development integrating cellular metabolism, immune regulation, and evolutionary principles.

Main Results:

  • The AIS possesses core features of a homeostatic, regulatory circuit.
  • Mitochondrial mobility, essential for tissue homeostasis, presents intrinsic immunological dangers.
  • Multicellular complexity necessitated a supervisory system for managing these dangers.

Conclusions:

  • The adaptive immune system (AIS) functions as a constitutive danger management network.
  • This network integrates tissue homeostasis, metabolic surveillance, immune tolerance, and immunological defense.
  • This reframing offers a more comprehensive understanding of the AIS's role in multicellular organisms.