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Related Concept Videos

Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Cross-reactivity00:42

Cross-reactivity

Overview
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...
Antibody Actions01:26

Antibody Actions

Antibodies, or immunoglobulins, are critical players in the immune system's arsenal against invading pathogens. Produced by B cells and plasma cells, their primary role is to detect and bind to specific antigens, molecules found on the surface of pathogens like bacteria or viruses. Beyond antigen recognition, antibodies perform several vital functions that contribute to immune defense.
Neutralization
Antibodies can bind to pathogens, preventing them from infecting host cells. This process...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
Antigen Processing Pathways01:31

Antigen Processing Pathways

MHC molecules are key players in the immune response, enabling T cells to recognize and respond to specific antigens. They are present on the surface of all nucleated cells in the body and are instrumental in presenting antigens to T cells and activating them. T cells recognize the MHC-antigen complex and initiate an immune response. MHC class I and MHC class II are two main types of MHC molecules, each associated with a distinct antigen processing pathway.
MHC Class I: Presenting Endogenous...

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Updated: Jun 12, 2026

Antigenic Liposomes for Generation of Disease-specific Antibodies
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Antigenic Liposomes for Generation of Disease-specific Antibodies

Published on: October 25, 2018

Superantigens.

Nicholas W Stow1, Richard Douglas, Pongsakorn Tantilipikorn

  • 1Department of Otorhinolaryngology-Head and Neck Surgery, North Shore Hospital, Private Bag 93-503 Takapuna, North Shore City 0740, Auckland, New Zealand. nickstow@hotmail.com

Otolaryngologic Clinics of North America
|June 8, 2010
PubMed
Summary
This summary is machine-generated.

Superantigens (SAgs) and SAg-like proteins influence immune responses, potentially contributing to allergic conditions and inflammatory airway diseases. Further research is needed to clarify the specific roles of SAg-like proteins.

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Area of Science:

  • Immunology
  • Allergy Research
  • Microbial Pathogenesis

Background:

  • Superantigens (SAgs) are microbial, viral, or host-derived proteins with significant immunomodulatory effects.
  • SAgs can induce lymphocyte activation, tolerance, and act as superallergens in allergic individuals.
  • Staphylococcal SAg-like proteins represent a distinct class with mechanisms that differ from classical SAgs, particularly in innate immunity.

Purpose of the Study:

  • To review the multifaceted roles of Superantigens (SAgs) and SAg-like proteins in immune system modulation.
  • To explore the potential involvement of SAgs and SAg-like proteins in the pathophysiology of inflammatory airway diseases.
  • To highlight the need for further investigation into the specific mechanisms of SAg-like proteins.

Main Methods:

  • Literature review and synthesis of existing research on Superantigens (SAgs) and SAg-like proteins.
  • Analysis of immunologic pathways affected by SAgs, including lymphocyte activation, tolerance, and allergic responses.
  • Examination of evidence linking SAgs to inflammatory airway diseases.

Main Results:

  • SAgs induce initial lymphocyte activation followed by clonal deletion and anergy, promoting immune tolerance.
  • SAgs can function as superallergens, activating mast cells and basophils in allergic patients.
  • Staphylococcal SAg-like proteins exhibit distinct mechanisms, impacting innate immunity separately from acquired immune processes.

Conclusions:

  • SAgs possess diverse functions, ranging from inducing immune tolerance to exacerbating allergic conditions.
  • Emerging evidence implicates SAgs in the development of inflammatory airway diseases.
  • The precise pathophysiologic role of SAg-like proteins remains to be elucidated and requires further dedicated study.