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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

Overview
Cross-reactivity00:42

Cross-reactivity

Overview
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),...
Antigens Involved in Adaptive Immunity01:26

Antigens Involved in Adaptive Immunity

An antigen is any substance the immune system identifies as foreign and potentially harmful to the body, prompting an immune response. Antigens have two functional properties: immunogenicity and reactivity. Immunogenicity is the ability of an antigen to stimulate a specific immune response. At the same time, reactivity describes the antigen's ability to react with the cells and antibodies produced in response to it.
Complete Antigens
Complete antigens possess both immunogenicity and reactivity.
Allergic Drug Reactions01:27

Allergic Drug Reactions

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...
Hypersensitivities01:30

Hypersensitivities

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.
Types of Hypersensitivities
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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Related Experiment Video

Updated: Jul 4, 2026

Application of Biochip Microfluidic Technology to Detect Serum Allergen-specific Immunoglobulin E (sIgE)
07:10

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Published on: April 21, 2019

Are we getting enough allergens?

Allan Linneberg1

  • 1Research Centre for Prevention and Health, Capital Region of Denmark, Glostrup University Hospital, Glostrup, Denmark. alli@glo.regionh.dk

International Archives of Allergy and Immunology
|June 4, 2008
PubMed
Summary
This summary is machine-generated.

Reduced exposure to allergens in Westernized societies may increase the risk of IgE-mediated allergic diseases. This lack of exposure hinders the development of immune tolerance to environmental allergens, prompting further research.

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Last Updated: Jul 4, 2026

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Area of Science:

  • Immunology
  • Environmental Health
  • Epidemiology

Background:

  • Westernized lifestyles are associated with increased incidence of allergic diseases.
  • Hygiene hypothesis suggests reduced microbial and allergen exposure impacts immune development.
  • IgE-mediated allergic diseases pose a significant public health burden.

Purpose of the Study:

  • To investigate the hypothesis that reduced allergen exposure contributes to higher allergy risk.
  • To explore the link between Westernized lifestyles and impaired immune tolerance.
  • To review evidence supporting or refuting the reduced allergen exposure hypothesis.

Main Methods:

  • Literature review of epidemiological studies.
  • Analysis of immunological data on immune tolerance.
  • Synthesis of evidence regarding allergen exposure and allergic disease.

Main Results:

  • Populations with urbanized, Westernized lifestyles show higher rates of allergic disease.
  • Reduced exposure to common environmental allergens may impair immune tolerance induction.
  • Evidence exists to support and contradict the proposed hypothesis.

Conclusions:

  • Reduced allergen exposure is a plausible factor in the rise of allergic diseases.
  • Failure to induce immune tolerance is a key mechanism.
  • Further research is needed to elucidate the precise role of allergen exposure.