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Cell-mediated Immune Responses01:40

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The epidermis is made of four or five layers of epithelial cells, depending on its location in the body. From deep to superficial, these layers are the stratum basale, stratum spinosum, stratum granulosum, stratum lucidum, and stratum corneum.
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The dermis might be considered the "core" of the integumentary system, as distinct from the epidermis and hypodermis. It contains blood and lymph vessels, nerves, and other structures, such as hair follicles and sweat glands. The dermis is made of two layers of connective tissue that comprise an interconnected mesh of elastin and collagenous fibers, produced by fibroblasts.
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The immune system is a complex network of cells and molecules that protects the body from foreign invaders. T cells, a type of white blood cell, play a crucial role in this process. They recognize and attack foreign substances, such as pathogens, that enter the body.
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Related Experiment Video

Updated: Jan 2, 2026

A Mouse Ear Model for Allergic Contact Dermatitis Evaluation
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Dendritic cells and contact dermatitis.

Yoshinori Sasaki1, Setsuya Aiba

  • 1Department of Dermatology, Graduate School of Medicine 1-1, Tohoku University, Seiryo-Machi, Sendai, Japan.

Clinical Reviews in Allergy & Immunology
|December 21, 2007
PubMed
Summary

Allergic contact dermatitis involves skin immune responses to chemicals. Our study shows haptens activate dendritic cells via p38 MAPK, suggesting a role for intracellular redox balance in this biological response.

Area of Science:

  • Immunology
  • Dermatology
  • Cell Biology

Background:

  • Contact dermatitis is a skin reaction to chemicals.
  • The immune system mediates allergic contact dermatitis.
  • The protective role of this response remains unclear.

Purpose of the Study:

  • To investigate the role of Langerhans cells and dendritic cells in allergic contact dermatitis.
  • To elucidate the molecular mechanisms underlying hapten activation of these cells.
  • To discuss the biological significance of contact dermatitis.

Main Methods:

  • In vivo studies in mice to observe hapten activation of Langerhans cells.
  • In vitro studies using human monocyte-derived dendritic cells.
  • Analysis of p38 mitogen-activated protein kinase (MAPK) pathways and intracellular redox balance.

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Main Results:

  • Haptens activate Langerhans cells during the initiation phase of allergic contact dermatitis in mice.
  • Haptens activate human monocyte-derived dendritic cells in vitro.
  • Dendritic cell activation by haptens is primarily mediated by p38 MAPK activation.
  • p38 MAPK activation is linked to intracellular redox imbalance.

Conclusions:

  • Hapten activation of dendritic cells, mediated by p38 MAPK and redox imbalance, is a key event in allergic contact dermatitis.
  • These findings contribute to understanding the biological significance of contact dermatitis.
  • Further insights into Langerhans cell biology are provided.