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Allergic Reactions

Allergic Reactions

Allergic Reactions: Anaphylaxis

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 Reactions

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...

Cross-reactivity

Cross-reactivity

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...

Antigens Involved in Adaptive Immunity

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.

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Related Experiment Video

Updated: May 9, 2026

Basophil Activation Test for Allergy Diagnosis

Basophil Activation Test for Allergy Diagnosis

Published on: May 31, 2021

Recombinant allergen-based provocation testing.

Verena Niederberger¹, Julia Eckl-Dorna¹, Gabrielle Pauli²

¹Dept. of Otorhinolaryngology, Medical University of Vienna, Austria.

Methods (San Diego, Calif.)

|August 8, 2013

Summary

This summary is machine-generated.

Recombinant allergens offer consistent, precise allergy diagnosis and potential for new vaccines. Despite proven efficacy, these advanced tools are not yet standard in clinical allergy testing.

Keywords:

Atopy patch test Colonic provocation Intradermal test Nasal provocation Recombinant allergen Skin prick test

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Last Updated: May 9, 2026

Basophil Activation Test for Allergy Diagnosis

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Published on: May 31, 2021

Symptom Assessment of Patients with Allergic Rhinitis Using an Allergen Exposure Chamber

Symptom Assessment of Patients with Allergic Rhinitis Using an Allergen Exposure Chamber

Published on: March 3, 2023

Humanized Mediator Release Assay as a Read-Out for Allergen Potency

Humanized Mediator Release Assay as a Read-Out for Allergen Potency

Published on: June 29, 2021

Area of Science:

Allergen immunotherapy
Molecular allergology
Diagnostic tools

Background:

Recombinant allergens, available for 25 years, offer consistent production and clinical effects similar to natural allergens.
These molecules enable precise patient reactivity profiling and differentiation of cross-reactivity from genuine sensitization.
Current diagnostic methods still rely on crude allergen extracts, despite the availability of recombinant alternatives.

Purpose of the Study:

To review key provocation methods used in allergy diagnosis.
To summarize clinical studies employing recombinant allergens in provocation tests.
To highlight the potential of recombinant allergens in advancing allergy diagnostics and therapeutics.

Main Methods:

Review of established provocation tests: skin prick test, intradermal test, atopy patch test, nasal provocation, and colonoscopic provocation test.
Compilation and analysis of existing clinical provocation studies utilizing recombinant allergens.
Comparison of recombinant allergens with natural counterparts in diagnostic accuracy.

Main Results:

Recombinant allergens demonstrate comparable clinical effects to natural allergens in provocation tests.
These tools allow for detailed characterization of patient sensitization profiles.
Studies indicate the potential for improved diagnostic accuracy and differentiation of allergic responses.

Conclusions:

Recombinant allergens are valuable tools for precise allergy diagnosis and research.
Their application in clinical routine diagnostics and vaccine development is crucial.
Further integration of recombinant allergens into standard clinical practice is warranted.