Allergic Host Response
Allergic Host Response - Related Videos
02:06
Allergic Reactions
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2019
Overview We speak of an allergy when the immune system triggers a response against a benign foreign structure, like food, pollen or pet dander. These elicitors are called allergens. If the immune system of a hypersensitive individual was primed against a specific allergen, it will trigger allergic symptoms during every subsequent encounter of the allergen. Symptoms can be mild, such as hay fever, to severe, such as potentially fatal anaphylactic shock. Sensitization Is the First Step of an...
05:39
Humanized Mediator Enzyme Release Assay: An Immunochemical Method to Screen Allergic Potential of Test Antigen by Monitoring Basophil Degranulation Response In Vitro
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2025
In this video, we describe an in vitro method to evaluate the allergic potential of an antigen to induce basophil degranulation. β-hexosaminidase is used as an index of chemical mediator release, and the enzyme activity of β-hexosaminidase is measured using a fluorogenic substrate.
02:46
Intranasal Murine Herpesvirus Infection in Mice to Assess Host Immune Responses
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2026
Source: Zhang, J., et al. P. Dissecting Innate Immune Signaling in Viral Evasion of Cytokine Production. J. Vis. Exp. (2014)This video demonstrates intranasal delivery of murine herpesvirus in mice to induce a lung-specific immune response. Lung tissue is subsequently processed to obtain cytokine-containing supernatants for downstream assessment of host immune responses.
10:10
Experimental Infection with Listeria monocytogenes as a Model for Studying Host Interferon-γ Responses
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2016
This protocol describes how to inoculate C57BL/6J mice with the EGD strain of Listeria monocytogenes (L. monocytogenes) and to measure interferon-γ (IFN-γ) responses by natural killer (NK) cells, natural killer T (NKT) cells, and adaptive T lymphocytes post-infection. This protocol also describes how to conduct survival studies in mice after infection with a modified LD50 dose of the pathogen.
07:52
Analysis of Pulmonary Dendritic Cell Maturation and Migration during Allergic Airway Inflammation
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Cited by 1 •
2012
We describe a strategy to monitor maturation and migration of pulmonary dendritic cells in response to ovalbumin in the setting of ovalbumin induced allergic airway inflammation. This strategy can be modified to assess migration of pulmonary dendritic cells in settings of infection.
FAQs
During sensitization, the important biological change is the formation of an IgE-based recognition system for the allergen. IgE then associates with mast cells, positioning these immune cells to respond if the same substance is encountered again. This stage creates the cellular basis for later mediator release rather than immediate symptom production.
Allergen-mediated cross-linking connects the recognition step to mast-cell degranulation. Once triggered, the mast cell releases histamine and other inflammatory mediators, converting allergen recognition into biological effects such as itching, swelling, mucus production, or airway narrowing. This sequence explains how exposure produces symptoms.
Histamine and other inflammatory mediators released during mast-cell degranulation help account for the response's observable effects. Itching, swelling, mucus production, and airway narrowing represent different consequences of that release. Linking these outcomes to degranulation helps biology researchers connect cellular events with the symptoms recorded in allergic disease.
An allergic host response can extend beyond a reaction at one location and progress to systemic anaphylaxis. This possibility shows that mediator release may be associated with effects involving the body broadly rather than remaining limited to itching, swelling, mucus production, or airway narrowing. The distinction is important when studying response severity.
The pathway identifies several linked biological features for investigation: sensitization, IgE associated with mast cells, allergen-mediated cross-linking, and mediator release. Examining these features can help research distinguish the underlying immune process from its visible outcomes, supporting the development of approaches for allergy diagnosis and improving understanding of allergic disease.
The allergic host response supplies a defined immune pathway for evaluating ways to address allergic reactions, from IgE and mast-cell events to the inflammatory effects that produce symptoms. Research on antihistamines, immunotherapy, and immune regulation therefore connects cellular mechanisms with potential strategies for controlling or modifying the response.