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Hypersensitivities01:30

Hypersensitivities

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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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Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
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Aryldiazonium Salts to Azo Dyes: Diazo Coupling01:11

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The reaction of weakly electrophilic aryldiazonium (also called arenediazonium) salts with highly activated aromatic compounds leads to the formation of products with an —N=N— link, called an azo linkage. This reaction, presented in Figure 1, is known as diazo coupling and occurs without the loss of the nitrogen atoms of the aryldiazonium salt. Highly activated aromatic compounds such as phenols or arylamines favor the diazo coupling reaction. The coupling generally occurs at the...
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Desensitization and Tachyphylaxis01:20

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Tachyphylaxis is described as a rapid decrease in response to a drug after repeated or continuous administration of the same drug dose. It is a phenomenon where the body becomes less responsive to a particular substance or intervention over time, requiring higher doses or stronger interventions to achieve the same effect. It results from adaptive changes in the body's receptors, signaling pathways, or physiological processes that occur in response to prolonged exposure to a stimulus.
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Pharmacodynamics is a scientific field that delves into drugs' intricate biochemical, cellular, and physiological effects on the human body. The study of pharmacodynamics helps us understand how drugs interact with the body and elicit various responses.
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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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Drugs, the chemical agents used in diagnosing, treating, or preventing diseases, undergo a four-phase process of development: pharmaceutic, pharmacokinetics, pharmacodynamics, and therapeutic.
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Overview and Current Advances in Dapsone Hypersensitivity Syndrome.

Zhen-Zhen Wang1, Rui Zeng1, Zi-Wei Wu2

  • 1Hospital of Skin Diseases and Institute of Dermatology, Chinese Academy of Medical Sciences & Peking Union Medical College, St. 12 Jiangwangmiao, Nanjing, Jiangsu, China.

Current Allergy and Asthma Reports
|October 7, 2023
PubMed
Summary

Dapsone hypersensitivity syndrome, a severe adverse effect, is linked to HLA-B*13:01 and T-cell receptor interactions. Understanding this mechanism aids in diagnosing, preventing, and treating dapsone reactions.

Keywords:
Cytotoxic T cellsDapsoneDrug hypersensitivity syndromeHLA-B*13:01TCR

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Area of Science:

  • Immunology
  • Pharmacology
  • Genetics

Background:

  • Dapsone, a sulfone antibiotic, treats leprosy and immune diseases due to its anti-inflammatory properties.
  • Dapsone hypersensitivity syndrome (DHS) is a severe adverse effect, characterized by rash, fever, and organ involvement, limiting its use.

Purpose of the Study:

  • To review current research on the interaction model between HLA-B*13:01, dapsone, and T-cell receptors (TCRs) in dapsone-induced hypersensitivity.
  • To discuss the pathogenesis, clinical features, prevalence, and prevention strategies for DHS.

Main Methods:

  • Review of current research on the molecular interactions in DHS.
  • Analysis of genetic susceptibility, innate, and adaptive immunity in DHS.

Main Results:

  • The interaction between HLA-B*13:01, dapsone, and specific TCRs is a key factor in DHS.
  • Genetic factors, particularly HLA-B*13:01, play a significant role in dapsone hypersensitivity.

Conclusions:

  • Understanding the interaction model provides insights into DHS pathogenesis.
  • This knowledge guides clinical diagnosis, prevention, and treatment of DHS, improving patient outcomes.