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Hypersensitivity Reactions: Immune-Complex Reactions

Hypersensitivity Reactions: Immune-Complex Reactions

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...

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...

Hypersensitivities

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...

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

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...

Hypersensitivity Reactions: Cytolytic Reactions

Hypersensitivity Reactions: Cytolytic Reactions

Type II hypersensitivity involves IgG and IgM antibodies targeting cell surface antigens, leading to cell destruction. This can occur through complement activation, antibody-dependent cell-mediated cytotoxicity (ADCC), or acting as opsonins for phagocytosis. When excessive, these reactions cause significant tissue damage.Drug-induced hemolytic anemia is a common example, where drugs like penicillin or cephalosporins bind to red blood cells, forming drug-protein complexes. These complexes...

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),...

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Related Experiment Video

Updated: Jun 2, 2026

Potentiodynamic Corrosion Testing

Potentiodynamic Corrosion Testing

Published on: September 4, 2016

Cutaneous and systemic hypersensitivity reactions to metallic implants.

Juliana L Basko-Plluska¹, Jacob P Thyssen, Peter C Schalock

¹Department of Medicine, Section of Dermatology, The University of Chicago, Chicago, IL, USA.

Dermatitis : Contact, Atopic, Occupational, Drug

|April 21, 2011

Summary

Metal implants can cause allergic skin reactions, including dermatitis and more complex immune responses. Understanding metal sensitivity is crucial for managing implant-related complications and patient health.

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Last Updated: Jun 2, 2026

Potentiodynamic Corrosion Testing

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Published on: September 4, 2016

Multi-Scale Modification of Metallic Implants With Pore Gradients, Polyelectrolytes and Their Indirect Monitoring In vivo

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Published on: July 1, 2013

Mitigation of Blood Borne Cell Attachment to Metal Implants through CD47-Derived Peptide Immobilization

Mitigation of Blood Borne Cell Attachment to Metal Implants through CD47-Derived Peptide Immobilization

Published on: December 3, 2020

Area of Science:

Dermatology
Implantology
Allergy Immunology

Background:

Cutaneous reactions to metal implants are documented, with dermatitis being common.
Reactions range from eczematous to more complex immune responses causing pain and loosening.
Nickel, cobalt, and chromium are primary culprits, but other metals and bone cement can also cause hypersensitivity.

Purpose of the Study:

To review current knowledge on metal sensitivity and cutaneous allergic reactions.
To provide an update for healthcare providers managing patients with implant-related conditions.

Main Methods:

Literature review of documented cases and research on metal implant reactions.
Analysis of common allergens and types of hypersensitivity reactions.
Discussion of delayed-type hypersensitivity reactions to various implanted devices.

Main Results:

Stainless steel implants were first linked to dermatitis in 1966.
Allergic reactions are often eczematous but can manifest as urticarial, bullous, or vasculitic eruptions.
Delayed-type hypersensitivity can lead to prosthesis loosening, inflammation, and pain.

Conclusions:

The association between metal sensitivity and cutaneous reactions requires further understanding.
This review offers valuable insights for clinicians managing patients with metal implant hypersensitivity.
Continued research is needed to fully elucidate the mechanisms and management of these reactions.