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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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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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Surfactants, named for their behavior at interfaces, positively adsorb at the interfaces of two phases, reducing interfacial tension. Their versatility as emulsifiers, detergents, and foaming agents stems from this ability. Surfactants, often termed amphiphiles, share the property of amphipathy, with molecules having both hydrophilic and hydrophobic portions. The hydrophilic part is called the head, and the hydrophobic part, including an elongated alkyl substituent, forms the tail.Surfactants...
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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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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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Cutaneous Delayed-Type Hypersensitivity to Surfactants.

Joseph F Fowler1, Cristin N Shaughnessy, Donald V Belsito

  • 1From the University of Louisville School of Medicine, Louisville, KY.

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Summary
This summary is machine-generated.

Surfactants like oleamidopropyl dimethylamine (OPD) and dimethylaminopropylamine (DMAPA) show higher rates of allergic contact dermatitis. Patch testing reveals significant overlap in reactions, with cocamide diethanolamide (CDEA) being least likely to co-react.

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Area of Science:

  • Dermatology
  • Contact Dermatitis
  • Allergens

Background:

  • Surfactants are common in personal care products.
  • Prolonged use can lead to irritant and allergic contact dermatitis.

Purpose of the Study:

  • To determine the frequency of positive patch tests to specific surfactants.
  • To analyze cross-reactivity patterns between surfactants.

Main Methods:

  • Retrospective analysis of 10,877 patients patch tested between 2009 and 2014.
  • Tested surfactants included cocamidopropyl betaine (CAPB), amidoamine (AA), dimethylaminopropylamine (DMAPA), oleamidopropyl dimethylamine (OPD), and cocamide diethanolamide (CDEA).
  • Calculated frequencies of positive reactions and analyzed trends.

Main Results:

  • Oleamidopropyl dimethylamine (OPD) showed the highest positive reaction rate (2.3%), followed by DMAPA (1.7%) and CAPB (1.4%).
  • Amidoamine (AA) and cocamide diethanolamide (CDEA) had the lowest rates (0.8%).
  • A high degree of cross-reactivity was observed between surfactants.

Conclusions:

  • OPD and DMAPA are significant contact allergens.
  • Cocamide diethanolamide (CDEA) demonstrated the least co-reactivity with other tested surfactants.
  • Understanding these reactions is crucial for diagnosing and managing contact dermatitis.