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Related Concept Videos

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...
Allergic Reactions: Anaphylaxis01:30

Allergic Reactions: Anaphylaxis

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, heparin),...
Allergic Drug Reactions01:27

Allergic Drug Reactions

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 numerous...
Hypersensitivities01:30

Hypersensitivities

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...
Allergic Reactions02:06

Allergic Reactions

Overview
Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...

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A Mouse Ear Model for Allergic Contact Dermatitis Evaluation
08:02

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Published on: March 24, 2023

Photoallergic contact dermatitis.

Alastair Kerr1, James Ferguson

  • 1Photobiology Unit, Ninewells Hospital, Dundee, UK. a.kerr@dundee.ac.uk

Photodermatology, Photoimmunology & Photomedicine
|April 27, 2010
PubMed
Summary
This summary is machine-generated.

Photoallergic contact dermatitis (PACD) is often missed because photopatch testing is underused. Standardized testing methods and ongoing research are crucial for accurate diagnosis of this light-induced skin reaction.

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Area of Science:

  • Dermatology
  • Photobiology
  • Immunology

Background:

  • Photoallergic contact dermatitis (PACD) is a skin reaction triggered by exogenous agents and light exposure.
  • Photopatch testing is the primary diagnostic method for PACD.
  • Underutilization of photopatch testing leads to missed diagnoses.

Purpose of the Study:

  • Emphasize the significance of PACD and photopatch testing in diagnosing photo-exposed dermatoses.
  • Advocate for increased clinical use of photopatch testing.

Main Methods:

  • Comprehensive literature review on PACD and photopatch testing methodologies.
  • Analysis of current and historical causative agents.
  • Evaluation of diagnostic test standardization.

Main Results:

  • PACD is a delayed hypersensitivity reaction.
  • Common photosensitizers include sunscreens and topical NSAIDs.
  • A European consensus methodology for photopatch testing now exists, improving result comparability.
  • Pre-market human testing of new agents is recommended to prevent widespread exposure.

Conclusions:

  • Standardized photopatch testing is essential for accurate PACD diagnosis.
  • Ongoing research and updated test batteries are necessary to identify new photosensitizers.
  • Increased clinician awareness and utilization of photopatch testing are vital.