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Related Concept Videos

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...
Inflammatory Response01:28

Inflammatory Response

An inflammatory response is a localized, nonspecific immune reaction that occurs when a tissue is injured. It is characterized by redness, swelling, heat, and pain, which are commonly called the cardinal signs and symptoms of inflammation. Inflammation can sometimes result in a loss of function.
Inflammation can be triggered by various stimuli, such as impact, abrasion, chemical irritation, infections, and extreme hot or cold temperatures. These can damage cells and connective tissue fibers,...
Cell-mediated Immune Responses01:40

Cell-mediated Immune Responses

Overview
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...
T Cell Types and Functions01:24

T Cell Types and Functions

When T cells with CD4 markers are activated, they give rise to two types of effector cells: helper T cells and regulatory T cells. Meanwhile, T cells with CD8 markers differentiate into effector cytotoxic T cells. The differentiation of CD4 T cells into helper T cell subsets, such as Th1, Th2, and Th17 cells, is dependent on the antigen type, antigen-presenting cell, and regulatory cytokines.
Th1 cells stimulate dendritic cells to express necessary co-stimulatory molecules on their surfaces for...
Allergic Reactions02:06

Allergic Reactions

Overview

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Related Experiment Video

Updated: May 20, 2026

Murine Model of Epicutaneously-Induced Immunomodulation
09:07

Murine Model of Epicutaneously-Induced Immunomodulation

Published on: June 24, 2025

Immunoregulation in cutaneous allergy: prevention and control.

Christina E Zielinski1, Torsten Zuberbier, Marcus Maurer

  • 1Department of Dermatology and Allergology, Charité-UniversitätsmedizinBerlin, Berlin, Germany. christina.zielinski@charite.de

Current Opinion in Allergy and Clinical Immunology
|July 25, 2012
PubMed
Summary

Regulatory T cells are crucial for preventing skin inflammation. Dysfunction in these cells and other immune cells leads to cutaneous allergies, highlighting potential therapeutic targets.

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Area of Science:

  • Immunology
  • Dermatology

Background:

  • The skin constantly interacts with environmental factors like chemicals and microbes.
  • Despite these exposures, the skin typically maintains homeostasis without inflammation.

Purpose of the Study:

  • To explore the role of T regulatory cells in maintaining skin homeostasis.
  • To discuss their dysfunction in cutaneous allergy, specifically contact hypersensitivity.

Main Methods:

  • Review of current literature on T regulatory cells and cutaneous allergy.
  • Analysis of immune regulation mechanisms in skin homeostasis and allergy.

Main Results:

  • T regulatory cells are potent immunosuppressors; their absence causes skin inflammation and allergy.
  • Recent findings show T regulatory cells are heterogeneous with specialized functions.
  • The stability and function of T regulatory cells in inflammatory environments are debated.
  • Pathogenic effector T cells can sometimes adopt regulatory mechanisms.

Conclusions:

  • Immunoregulatory mechanisms are impaired in cutaneous allergy.
  • Both classical T regulatory cells and effector T cells with regulatory roles are involved.
  • Understanding these mechanisms offers potential therapeutic targets for skin allergies.