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Related Concept Videos

Hypersensitivities01:30

Hypersensitivities

7.1K
Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
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Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

266
Anaphylaxis is a severe, life-threatening hypersensitivity reaction mediated by Immunoglobulin E (IgE) antibodies. When IgE binds to allergens, it triggers the release of mediators– histamine, leukotrienes, and prostaglandins from mast cells and basophils. These mediators cause vasodilation, edema, and inflammation, leading to various symptoms.The primary allergens causing anaphylaxis include food items (e.g., peanuts, shellfish), drugs (e.g., penicillin, asparaginase, corticotropin,...
266
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

199
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...
199
Allergic Drug Reactions01:27

Allergic Drug Reactions

1.6K
Allergic reactions related to drugs are hypersensitivity responses driven by the immune system and bear no connection to the drug's therapeutic action. While drugs in isolation do not trigger an immune response, they can interact with endogenous proteins to form antigens. These antigens stimulate lymphocytes to produce antibodies. IgE-type antibodies attach themselves to mast cells. Upon subsequent exposure to the same stimulus, the antigen-antibody interaction is initiated, unleashing...
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Allergic Reactions02:06

Allergic Reactions

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Overview
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Cross-reactivity00:42

Cross-reactivity

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Related Experiment Video

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Murine Model of Epicutaneously-Induced Immunomodulation
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Murine Model of Epicutaneously-Induced Immunomodulation

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New concepts in cutaneous allergy.

Stefan F Martin1

  • 1Allergy Research Group, Department of Dermatology, Medical Centre - University of Freiburg, Hauptstrasse 7, D-79104, Freiburg, Germany.

Contact Dermatitis
|October 29, 2014
PubMed
Summary

Understanding allergic contact dermatitis mechanisms is crucial. Research reveals immune pathways activated by contact allergens, paving the way for better diagnostics and treatments for this common skin condition.

Keywords:
T cellchemicalcontact dermatitisdendritic cellinflammationinnate immunityskin

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Area of Science:

  • Immunology
  • Dermatology
  • Toxicology

Background:

  • Allergic contact dermatitis (ACD) is a prevalent delayed-type hypersensitivity reaction.
  • The precise mechanisms linking chemical contact allergens to skin inflammation remain incompletely understood.
  • ACD affects a significant portion of the general population, necessitating further research.

Purpose of the Study:

  • To elucidate the molecular and cellular pathways involved in ACD pathogenesis.
  • To identify key proteins and signaling cascades activated by contact allergens.
  • To advance the understanding of the immune response to contact allergens.

Main Methods:

  • Utilizing genomic and proteomic techniques for pathway identification.
  • Characterizing cellular players and their interactions in ACD.
  • Investigating protein modifications induced by contact allergens.

Main Results:

  • Identification of specific signaling pathways used by the immune system to respond to contact allergens.
  • Characterization of cellular interactions and protein modifications central to ACD pathogenesis.
  • Genomic and proteomic approaches are aiding in pathway elucidation.

Conclusions:

  • A deeper cellular and molecular understanding of the immune response to contact allergens is emerging.
  • This knowledge is vital for developing improved diagnostic tools, such as gene and protein signatures.
  • It also facilitates the identification of novel therapeutic targets and the development of in vitro assays for allergen detection.