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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...
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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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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.
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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),...
Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

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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
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Published on: March 24, 2023

Irritant contact dermatitis from plants.

Gunjan M Modi1, Christy B Doherty, Rajani Katta

  • 1Baylor College of Medicine, Houston, TX, USA.

Dermatitis : Contact, Atopic, Occupational, Drug
|May 12, 2009
PubMed
Summary
This summary is machine-generated.

Plant-derived irritant contact dermatitis (ICD) is common, caused by physical and chemical irritants. Understanding these plant irritants is key to managing this widespread skin condition.

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Area of Science:

  • Dermatology
  • Botany
  • Toxicology

Background:

  • Irritant contact dermatitis (ICD) from plants is frequently encountered in daily environments.
  • Plant-derived irritants can be physical or chemical, leading to skin reactions.

Purpose of the Study:

  • To review major plant contributors to mechanical ICD (MICD) and chemical ICD (CICD).
  • To describe clinical presentations, diagnostic considerations, and exposure data for plant-induced ICD.
  • To discuss the mechanisms and treatments for plant-derived ICD.

Main Methods:

  • Literature review of plant-derived irritants and associated dermatitis.
  • Analysis of common mechanical irritants (thorns, spines, trichomes) and chemical irritants (calcium oxalate, protoanemonin, etc.).
  • Examination of clinical presentations, diagnosis, and treatment strategies.

Main Results:

  • Identified common physical plant irritants like thorns and trichomes.
  • Detailed known chemical irritants including calcium oxalate, protoanemonin, and diterpene esters.
  • Outlined clinical features, diagnostic approaches, and treatment options for plant ICD.

Conclusions:

  • A comprehensive understanding of plant irritants is crucial for managing ICD.
  • Effective diagnosis and treatment rely on recognizing specific plant contributors and their irritant mechanisms.