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Related Concept Videos

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...
T Cell Activation and Clonal Selection01:22

T Cell Activation and Clonal Selection

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.
Naive T cells that have not yet encountered an antigen express two primary CD...
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...
Asthma-II: Pathophysiology and Classification01:26

Asthma-II: Pathophysiology and Classification

Asthma is a prevalent chronic respiratory condition marked by inflammation and hyperresponsiveness of the airways. Its pathophysiology involves complex interactions among inflammatory pathways, immune responses, and neural mechanisms.
Additionally, environmental and genetic factors play crucial roles in determining an individual's susceptibility to asthma and the severity of their condition.
Critical processes in asthma pathophysiology include:
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...
Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...

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Related Experiment Video

Updated: Jul 14, 2026

Preparation of Single-cell Suspensions for Cytofluorimetric Analysis from Different Mouse Skin Regions
05:58

Preparation of Single-cell Suspensions for Cytofluorimetric Analysis from Different Mouse Skin Regions

Published on: April 20, 2016

Cellular and immunologic mechanisms in atopic dermatitis.

D Y Leung1, N A Soter

  • 1Division of Pediatric Allergy-Immunology, National Jewish Medical and Research Center and the Department of Pediatrics, University of Colorado Health Sciences Center, Denver, USA.

Journal of the American Academy of Dermatology
|January 6, 2001
PubMed
Summary

Atopic dermatitis, a chronic skin condition linked to allergies, involves complex genetic and environmental factors. Understanding its immune mechanisms, like T-cell responses and IgE, is key to developing better treatments.

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Area of Science:

  • Immunology
  • Dermatology
  • Allergy Research

Background:

  • Atopic dermatitis is a chronic inflammatory skin disease often co-occurring with respiratory allergies.
  • Its development stems from intricate interactions between environmental, immunologic, genetic, and pharmacologic factors.

Purpose of the Study:

  • To review the cellular and immunologic mechanisms underlying atopic dermatitis.
  • To explore how understanding these mechanisms can lead to improved therapeutic strategies.

Main Methods:

  • Review of existing research on effector cells and mediators in atopic dermatitis pathogenesis.
  • Analysis of factors including cytokine release, T-helper cell differentiation, IgE, and immune responses.

Main Results:

  • Identified key factors in atopic dermatitis pathogenesis: local cytokine patterns, T-helper cell differentiation, IgE, skin-directed cellular responses, infectious agents, and superantigens.
  • Highlighted the complex interplay of these elements in disease development.

Conclusions:

  • A comprehensive understanding of the cellular and immunologic mechanisms is crucial for advancing atopic dermatitis treatment.
  • Further research into these pathways promises novel therapeutic approaches for this condition.