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Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

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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...
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Drug Toxicity: Allergic Reactions01:30

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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...
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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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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.
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Allergic Reactions: Anaphylaxis01:30

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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,...
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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...
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Skin Tattooing As A Novel Approach For DNA Vaccine Delivery
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[Pseudolymphatic allergic immune reaction after tattooing].

T Jaehn1, A Kaiser2, C Grüneis3

  • 1Universitätsklinik für Plastische, Wiederherstellende und Handchirurgie, Zentrum für Schwerbrandverletzte, Paracelsus Medizinische Privatuniversität, Nürnberg.

Handchirurgie, Mikrochirurgie, Plastische Chirurgie : Organ Der Deutschsprachigen Arbeitsgemeinschaft Fur Handchirurgie : Organ Der Deutschsprachigen Arbeitsgemeinschaft Fur Mikrochirurgie Der Peripheren Nerven Und Gefasse : Organ Der V
|January 8, 2015
PubMed
Summary

Allergic reactions to tattoo ink, particularly red pigments, can cause rare skin issues. This case study details a pseudolymphoma treated successfully with surgical excision and skin grafting, resulting in complete healing.

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Area of Science:

  • Dermatology
  • Immunology
  • Pathology

Background:

  • Allergic reactions to tattoo pigments are uncommon.
  • Red tattoo ink ingredients are frequently implicated in adverse reactions.
  • Delayed hypersensitivity reactions can manifest months after tattooing.

Observation:

  • A 30-year-old female presented with a painful skin reaction 6 months post-tattooing on her right lower extremity.
  • The reaction was localized to the tattooed area.

Findings:

  • Pathohistological and immunochemical analyses confirmed the diagnosis of pseudolymphoma.
  • The pseudolymphoma was attributed to an allergic reaction to tattoo ink ingredients.

Implications:

  • Surgical excision, specifically tangential excision, is an effective treatment for tattoo-induced pseudolymphoma.
  • Split-thickness skin grafting provides successful defect coverage and long-term healing.
  • Early diagnosis and appropriate management are crucial for resolving tattoo-related skin complications.