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Related Concept Videos

Allergic Reactions: Anaphylaxis01:30

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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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 exposure to a...
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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 numerous...
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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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Acupoint Catgut Embedding Therapy in Traditional Chinese Medicine for Managing Allergic Rhinitis
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Published on: December 20, 2024

Allergy and the eye.

A Leonardi1, L Motterle, M Bortolotti

  • 1Ophthalmology Unit, Department of Neuroscience, University of Padova, Padova, Italy. andrea.leonardi@unipd.it

Clinical and Experimental Immunology
|September 6, 2008
PubMed
Summary
This summary is machine-generated.

Allergic eye diseases involve complex immune responses beyond simple IgE mechanisms. Chronic conditions like vernal and atopic keratoconjunctivitis require new treatments due to current therapy limitations.

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Area of Science:

  • Ophthalmology
  • Immunology
  • Allergy

Background:

  • The eye is a common site for allergic reactions, with allergic conjunctivitis encompassing various ocular surface disorders.
  • While diagnosis is often clinical, specialized tests can aid in understanding the immune mechanisms involved.

Purpose of the Study:

  • To explore the complex immunological mechanisms underlying chronic allergic eye diseases.
  • To highlight the limitations of current treatments and the need for novel therapeutic strategies.

Main Methods:

  • Review of current understanding of allergic eye disease pathogenesis.
  • Analysis of immunological pathways including T cell responses, cytokines, and chemokines.
  • Evaluation of existing therapeutic targets and their efficacy.

Main Results:

  • Immunoglobulin E (IgE)-mediated mechanisms alone do not fully explain severe chronic allergic eye diseases.
  • T cell-mediated responses, eosinophil activity, and altered cytokine balance (Th1/Th2) are implicated.
  • Complex interactions of various mediators contribute to pathogenesis, not just distinct pathways.

Conclusions:

  • Current treatments for ocular allergy address specific pathways but have limitations and side effects.
  • Severe forms like vernal (VKC) and atopic keratoconjunctivitis (AKC) necessitate the development of new therapeutic approaches.
  • Understanding the intricate immune interplay is crucial for advancing treatment strategies.