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Drug Toxicity: Allergic Reactions

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: Anaphylaxis

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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),...

Allergic Reactions

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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...

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Related Experiment Video

Updated: Jul 5, 2026

A Mouse Ear Model for Allergic Contact Dermatitis Evaluation

A Mouse Ear Model for Allergic Contact Dermatitis Evaluation

Published on: March 24, 2023

Allergic contact dermatitis.

Michael D Gober¹, Anthony A Gaspari

¹University of Maryland School of Medicine, Baltimore, MD 21030, USA.

Current Directions in Autoimmunity

|May 8, 2008

Summary

Allergic contact dermatitis involves skin immune responses to chemicals. Emerging research highlights roles for innate immune cells and keratinocytes, suggesting new therapeutic targets.

Area of Science:

Immunology
Dermatology

Background:

Allergic contact dermatitis is a T-cell mediated hypersensitivity reaction to xenobiotics.
It is characterized by skin inflammation, redness, edema, warmth, and itching.
Conventional T-cells (CD4+/CD8+) are key effectors, but innate immune cells are increasingly recognized.

Purpose of the Study:

To review the cellular players involved in allergic contact dermatitis.
To explore the roles of both conventional and innate immune cells.
To identify potential therapeutic targets for immune modulation.

Main Methods:

Review of existing literature on allergic contact dermatitis.
Analysis of the functions of various immune cells, including T-cells, B-cells, NK cells, and Langerhans cells.

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Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis

Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis

Published on: September 26, 2022

Examination of keratinocyte involvement in different phases of the reaction.

Main Results:

Conventional T-cells are critical, but innate lymphocytes (iNKT, NK cells) may also play significant roles.
Regulatory T-cells (Tregs, TR1) are important for resolution.
Langerhans cells' role is debated; keratinocytes are involved throughout the process, producing cytokines and interacting with T-cells.

Conclusions:

Understanding the complex cellular network in allergic contact dermatitis is crucial.
Keratinocytes and various immune cells contribute to initiation, inflammation, and resolution.
Further research may reveal novel targets for immune-modulating therapies.