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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.
Staphylococcal Skin Infections01:29

Staphylococcal Skin Infections

Staphylococcus aureus is a Gram-positive coccus that resides harmlessly on the skin and mucous membranes of healthy individuals. When the skin barrier is breached, it can shift from a commensal to an opportunistic pathogen. This transition is facilitated by surface adhesins, such as clumping factor B and S. aureus surface protein G (SasG), which bind to structural proteins, including loricrin and cytokeratin, in the damaged epidermis. Protein A, another key factor, binds the Fc region of...
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Cross-reactivity

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Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...
Skin Diseases and Disorders01:23

Skin Diseases and Disorders

Skin is the first line of defense and encounters a variety of microbes. Some pathogenic strains are often the cause of a broad range of infections of the skin and other body systems. These conditions can affect people of all ages and may have different causes, including genetic factors, infections, autoimmune reactions, environmental factors, and lifestyle choices.
Gram-positive Staphylococcus spp. and Streptococcus spp. are responsible for many of the most common skin infections. However, many...
Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

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A Mouse Ear Model for Allergic Contact Dermatitis Evaluation
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Published on: March 24, 2023

Superantigens in dermatology.

Edgar S Macias1, Frederick A Pereira, William Rietkerk

  • 1Department of Dermatology, New York Medical College, New York, New York 10029, USA. edgarmacias79@gmail.com

Journal of the American Academy of Dermatology
|February 15, 2011
PubMed
Summary
This summary is machine-generated.

Superantigens (SAgs) are potent toxins from microbes that cause widespread T cell activation. Understanding host genetics and early symptom recognition is key for managing SAg-related illnesses like toxic shock syndrome.

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Area of Science:

  • Immunology
  • Microbiology
  • Genetics

Background:

  • Superantigens (SAgs) are microbial toxins that induce potent, non-specific T cell activation.
  • SAgs bypass normal antigen processing, leading to widespread immune responses.
  • Host genetic factors influence susceptibility and protection against SAg effects.

Purpose of the Study:

  • To summarize the role of superantigens in human diseases.
  • To highlight the importance of host genetics in SAg interactions.
  • To emphasize the need for early clinical recognition of SAg-mediated conditions.

Main Methods:

  • Literature review of superantigen function and associated diseases.
  • Analysis of host genetic influences on immune responses to SAgs.
  • Clinical case review for SAg-mediated illness presentation.

Main Results:

  • SAgs are linked to severe conditions including toxic shock syndrome and erythema.
  • Host immune responses to SAgs are significantly modulated by genetic makeup.
  • Prompt identification of SAg-related symptoms is crucial for effective treatment.

Conclusions:

  • Superantigens represent a significant class of virulence factors with broad immunological impact.
  • Genetic predisposition plays a critical role in the pathogenesis of SAg-associated diseases.
  • Timely medical intervention based on early symptom detection improves patient outcomes in SAg-mediated illnesses.