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Immune System - Elicitation of Hypersensitivity Reaction

Molecular classification
Immune System Process
01

Overview

The immune system's inappropriate and exaggerated response to harmless antigens (allergens), leading to tissue damage and clinical symptoms. Hypersensitivity reactions are classified into four types (I-IV) based on the mechanism of action: Type I (IgE-mediated), Type II (antibody-mediated cytotoxicity), Type III (immune complex-mediated), and Type IV (T cell-mediated). This represents a malfunction of normal immune surveillance mechanisms, resulting in tissue injury due to excessive inflammation or direct cellular damage. Hypersensitivities underlie many allergic diseases, autoimmune disorders, and drug allergies.

Other names
Hypersensitivity ReactionAllergic ResponseGell and Coombs HypersensitivityType I HypersensitivityType II HypersensitivityType III HypersensitivityType IV Hypersensitivity
02

Biological functions

Immune responseDefense against pathogensInflammationTissue damage
03

Disease associations

AllergiesAutoimmunityAsthmaHay FeverDrug AllergiesContact Dermatitis
04

Safety considerations

AnaphylaxisOrgan damageChronic inflammationImmunosuppression (with certain treatments)
05

Interacting drugs

Antihistamines

4 more in the full profile.

06

Biomarkers

IgE levelsSpecific allergen IgET cell countsCytokine levelsComplement levelsAutoantibodies

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