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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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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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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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The photoaggravated dermatoses.

B J Kerker1, W L Morison

  • 1Department of Dermatology, Johns Hopkins University School of Medicine, Baltimore, MD.

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Summary
This summary is machine-generated.

Photoaggravated dermatoses are skin conditions worsened by ultraviolet (UV) light. While UV radiation

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Area of Science:

  • Dermatology and immunology, focusing on photobiology and immune-mediated skin diseases.

Background:

  • Photoaggravated dermatoses encompass a range of skin conditions exacerbated by sunlight or artificial ultraviolet (UV) exposure.
  • The role of UV radiation (UVR) is established in diseases like lupus erythematosus (LE) and bullous pemphigoid (BP).

Purpose of the Study:

  • To explore the diverse photoaggravated dermatoses and the underlying mechanisms of photosensitivity.
  • To discuss the immunologic theories implicated in photosensitivity, particularly in lupus erythematosus.

Main Methods:

  • Review of existing literature on photoaggravated dermatoses and their triggers.
  • Analysis of proposed immunologic mechanisms for UV-induced photosensitivity in conditions like lupus erythematosus.

Main Results:

  • UV radiation significantly impacts various dermatoses, including lupus erythematosus, bullous pemphigoid, erythema multiforme, actinic lichen planus, viral exanthems, cutaneous T-cell lymphoma, eczema, and psoriasis.
  • Key proposed mechanisms for photosensitivity in lupus erythematosus involve UV-DNA antibodies, impaired DNA repair, and the release of immune mediators.

Conclusions:

  • The mechanisms underlying photosensitivity in many dermatoses remain incompletely understood.
  • Management strategies include light avoidance, high-protection sunscreens, and treating the primary skin condition.