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Related Concept Videos

Hypersensitivities01:30

Hypersensitivities

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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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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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T cells are integral to our adaptive immune system, recognizing and effectively responding to foreign antigens. T cell activation and clonal selection are pivotal in orchestrating this immune response. This article elucidates these mechanisms, detailing the roles of cluster of differentiation (CD) markers, major histocompatibility complex (MHC) molecules, costimulatory signals, and the process of clonal selection.
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Antigens Involved in Adaptive Immunity01:26

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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.
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Related Experiment Video

Updated: Sep 19, 2025

Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
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Weak Sensitizers May Be Associated with CD80 Polymorphisms: Implications for Systemic Contact Dermatitis.

Susan Nedorost1, Ge Zhang2, Desta Fekedulegn3

  • 1Department of Dermatology, Case Western Reserve University, Cleveland, Ohio, USA.

JID Innovations : Skin Science From Molecules to Population Health
|June 16, 2025
PubMed
Summary

Chronic irritant dermatitis can lead to allergic reactions. This study links CD80 gene variations to positive patch tests for weak allergens, suggesting a new diagnostic pathway for allergic contact dermatitis.

Keywords:
Allergic contact dermatitisAtopic dermatitisFood allergyInnate lymphoid cellsSystemic contact dermatitis

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Area of Science:

  • Immunology
  • Dermatology
  • Genetics

Background:

  • Chronic irritant dermatitis increases susceptibility to Th2-skewed allergic contact dermatitis.
  • Atopic dermatitis (AD) and chronic hand dermatitis are linked to sensitization to weak or non-sensitizing antigens.
  • Systemic contact dermatitis occurs in about 15% of patients, presenting as recall dermatitis.

Purpose of the Study:

  • To explore genetic associations with allergic contact dermatitis.
  • To identify genetic factors influencing sensitization to weak or non-sensitizing allergens.
  • To investigate the role of CD80 in allergic contact dermatitis.

Main Methods:

  • A large exploratory study analyzing genetic polymorphisms.
  • Statistical analysis using p<0.005 and odds ratio (OR) >1.8 or <0.5.
  • Investigated associations between CD80 polymorphisms and positive patch tests to weak allergens.

Main Results:

  • Positive patch tests to weak allergens were common in individuals with specific CD80 polymorphisms.
  • CD80, a co-stimulatory molecule, is present on innate lymphoid group 2 cells (ILC2).
  • ILC2 presentation may bypass traditional lymph node sensitization pathways.

Conclusions:

  • CD80 polymorphisms are associated with positive patch tests to weak allergens, potentially explaining sensitization to non-traditional allergens.
  • Patients with hand dermatitis and atopic dermatitis may benefit from patch testing for food allergens and dietary restriction.
  • This finding suggests a novel mechanism involving CD80 and ILC2 in allergic contact dermatitis.