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Related Concept Videos

Allergic Reactions02:06

Allergic Reactions

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Overview
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Benzene to 1,4-Cyclohexadiene: Birch Reduction Mechanism01:18

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Birch reduction uses solvated electrons as reducing agents. The reaction converts benzene to 1,4-cyclohexadiene. The reaction proceeds by the transfer of a single electron to the ring to form a benzene radical anion. This anion is highly basic—it abstracts a proton from the alcohol to form a cyclohexadienyl radical. Another single electron transfer gives the cyclohexadienyl anion. A proton transfer from the alcohol forms 1,4-cyclohexadiene. Since this reduction occurs via radical anion...
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Allergic Reactions: Anaphylaxis01:30

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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,...
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Allergic Drug Reactions01:27

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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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Asthma I: Introduction01:28

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Asthma is a chronic inflammatory disorder of the airways characterized by variable airflow obstruction and heightened bronchial responsiveness to a wide range of triggers. The underlying inflammation leads to airway swelling, mucus hypersecretion, and smooth muscle constriction, all of which narrow the airway lumen and impede airflow. Clinically, asthma presents with recurrent episodes of wheezing, shortness of breath, chest tightness, and coughing, symptoms that typically vary in intensity and...
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Hypersensitivity Reactions: Immune-Complex Reactions01:19

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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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Related Experiment Video

Updated: May 2, 2026

Flow Cytometric Analysis of Particle-bound Bet v 1 Allergen in PM10
10:42

Flow Cytometric Analysis of Particle-bound Bet v 1 Allergen in PM10

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[Birch pollen allergy].

F Lavaud1, M Fore2, J-F Fontaine1

  • 1Service des maladies respiratoires et allergiques, CHU de Reims, 45, rue Cognacq-Jay, 51092 Reims cedex, France.

Revue Des Maladies Respiratoires
|March 8, 2014
PubMed
Summary
This summary is machine-generated.

Birch pollen is a major allergen in Northeast France, often causing allergic rhinoconjunctivitis and associated asthma or food allergies. Sensitization patterns and cross-reactivity due to the Bet v 1 allergen require further epidemiological study.

Keywords:
AllergensAllergieAllergyAllergènesBirchBouleauPollenTraitementTreatment

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Area of Science:

  • Allergology and Immunology
  • Environmental Health
  • Molecular Biology

Context:

  • Birch pollen is the primary cause of spring allergies in Northeast France.
  • The epidemiology of birch pollen sensitization is not well understood.
  • Cross-reactivity with other pollens, mediated by the Bet v 1 allergen, makes monosensitization to birch rare.

Purpose:

  • To clarify the epidemiology of sensitization to birch pollen.
  • To understand the prevalence of associated conditions like allergic rhinoconjunctivitis, asthma, and oral allergy syndrome.
  • To highlight the role of molecular allergens in diagnosis and treatment.

Summary:

  • Birch pollen allergy is significant in Northeast France, with frequent co-occurrences of allergic rhinoconjunctivitis, asthma (approx. 1/3 of patients), and food allergies (approx. 1/2), primarily oral syndrome from raw Rosaceae fruits.
  • Bet v 1, the major birch pollen allergen, is implicated in cross-reactions, suggesting monosensitization is uncommon.
  • Molecular allergens from birch pollen are identified and cloned, facilitating in vitro diagnostics and specific immunotherapy clinical trials.

Impact:

  • Improved understanding of birch pollen allergy epidemiology can lead to better diagnostic strategies.
  • Knowledge of cross-reactivity informs clinical management and patient counseling.
  • Availability of molecular allergens supports advancements in personalized allergy diagnostics and immunotherapy.