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Related Concept Videos

Antibody Structure01:10

Antibody Structure

Overview
Antibodies, also known as immunoglobulins (Ig), are essential players of the adaptive immune system. These antigen-binding proteins are produced by B cells and make up 20 percent of the total blood plasma by weight. In mammals, antibodies fall into five different classes, which each elicits a different biological response upon antigen binding.
The Y-Shaped Structure of Antibodies Consists of Four Polypeptide Chains
Antibodies consist of four polypeptide chains: two identical heavy...
Allergic Reactions02:06

Allergic Reactions

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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...
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.
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

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...
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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Challenges in the implementation of EAACI guidelines on allergen immunotherapy: A global perspective on the regulation of allergen products.

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Related Experiment Video

Updated: May 31, 2026

Removal and Replacement of Endogenous Ligands from Lipid-Bound Proteins and Allergens
09:09

Removal and Replacement of Endogenous Ligands from Lipid-Bound Proteins and Allergens

Published on: February 24, 2021

Characterization of allergen extracts.

J E Slater1

  • 1Laboratory of Immunobiochemistry, Division of Bacterial Parasitic and Allergenic Products, Office of Vaccines Regulation and Research, CBER/USFDA, Bethesda, MD, USA. slaterj@cber.fda.gov

Developments in Biologicals
|December 27, 2005
PubMed
Summary
This summary is machine-generated.

Standardized allergen vaccines are crucial for diagnosing and treating allergies. Potency relies on skin tests and validated in vitro methods, ensuring quality control for these complex natural extracts.

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Last Updated: May 31, 2026

Removal and Replacement of Endogenous Ligands from Lipid-Bound Proteins and Allergens
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Published on: February 24, 2021

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Area of Science:

  • Immunology
  • Pharmacology
  • Biotechnology

Background:

  • Allergen vaccines, derived from natural products, are vital for allergy diagnosis and treatment.
  • Standardization of allergen extracts ensures consistent product quality and therapeutic efficacy.
  • The U.S. has standardized 19 allergen extracts, with ongoing efforts to refine quality control measures.

Purpose of the Study:

  • To outline the current state of allergen vaccine standardization in the U.S.
  • To describe the methods used for potency estimation and quality control of allergen vaccines.
  • To highlight the role of reference standards and data-driven release limits in ensuring vaccine safety and effectiveness.

Main Methods:

  • Potency estimation using skin test responses in allergic individuals.
  • Establishment of surrogate in vitro tests for lot release and quality control.
  • Utilization of national reference standards maintained by the FDA/CBER for comparative analysis.

Main Results:

  • 19 allergen extracts have been standardized in the U.S.
  • Surrogate in vitro tests are established and vary depending on the specific allergen extract.
  • National reference standards are available for lot comparison and quality assurance.

Conclusions:

  • Allergen vaccine standardization has successfully led to the establishment of data-driven release limits.
  • Standardized procedures enhance the reliability and consistency of allergen vaccines for clinical use.
  • Continued refinement of standardization processes is essential for advancing allergy diagnostics and therapeutics.