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Related Concept Videos

Surface Membrane Barriers01:18

Surface Membrane Barriers

The skin and mucous membranes serve as the primary line of defense against pathogens by providing both physical and chemical protection. These barriers are essential in preventing the entry and establishment of microbes, thereby maintaining the integrity of the host.
The outer layer of the skin, the epidermis, is a robust barrier comprising layers of closely packed keratinized cells. This dense arrangement prevents microbes from penetrating the body. The periodic shedding of epidermal cells...
Introduction to the Integumentary System01:25

Introduction to the Integumentary System

The integumentary system is the organ system that comprises the skin and its associated structures. It is the largest system in the human body and plays a crucial role in protecting and maintaining homeostasis. The integumentary system serves several functions including protection, regulation, sensation, and secretion.
The skin, which is the primary organ of the integumentary system, consists of three main layers: the epidermis, dermis, and hypodermis (subcutaneous tissue). The epidermis is the...
Defense Mechanism Against Infection01:26

Defense Mechanism Against Infection

Natural flora, body system defenses, and inflammation are natural barriers of the body against infectious agents regardless of previous exposure. Normal floras of the human body refer to the microbial population that colonizes the skin and mucous membranes.
In addition, many body organ systems have unique defenses against infection. The skin is an intact, multilayered surface preventing invasion by microorganisms unless impaired. Mucous membranes lining the mouth, nose, and eyelids are barriers...
The Skin Microbiota01:27

The Skin Microbiota

The human skin serves as a complex ecosystem inhabited by a diverse community of microorganisms, including bacteria, fungi, and viruses. This microbiome plays a critical role in maintaining skin health and defending against pathogenic invaders. The composition of microbial communities varies significantly across different regions of the body, influenced primarily by the local levels of moisture and sebum.Regional Variation in Skin MicrobiotaCutibacterium acnes predominantly colonizes sebaceous...
Layers of the Epidermis01:21

Layers of the Epidermis

The epidermis, the outermost layer of the skin, is composed of several distinct layers. From deep to superficial, the layers of the epidermis are as follows:
Stratum Basale
Stratum basale, also known as the stratum germinativum, is the deepest layer of the epidermis. It is composed of a single layer of actively dividing cells called basal cells or basal keratinocytes. These cells constantly undergo cell division to replenish the upper layers of the epidermis. Additionally, melanocytes, which...
Physiological Barriers01:25

Physiological Barriers

Physiological barriers are semi-permeable cellular structures restricting drug diffusion into intracellular compartments and tissues. There are six types of physiological barriers: blood endothelial, cell membrane, blood-brain, blood-cerebrospinal fluid (CSF), blood-placenta, and blood-testis barriers.
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Updated: Jul 3, 2026

Isolation and Culture of Primary Mouse Keratinocytes from Neonatal and Adult Mouse Skin
10:51

Isolation and Culture of Primary Mouse Keratinocytes from Neonatal and Adult Mouse Skin

Published on: July 14, 2017

Skin barrier function.

Peter M Elias1

  • 1Dermatology Service (190), VA Medical Center, 4150 Clement Street, San Francisco, CA 94121, USA. eliasp@derm.ucsf.edu

Current Allergy and Asthma Reports
|July 9, 2008
PubMed
Summary
This summary is machine-generated.

Atopic dermatitis (AD) inflammation stems from skin barrier defects, not just immune system issues. New therapies should focus on repairing the skin barrier to reduce inflammation and itching in AD.

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Last Updated: Jul 3, 2026

Isolation and Culture of Primary Mouse Keratinocytes from Neonatal and Adult Mouse Skin
10:51

Isolation and Culture of Primary Mouse Keratinocytes from Neonatal and Adult Mouse Skin

Published on: July 14, 2017

Cultivating a Three-dimensional Reconstructed Human Epidermis at a Large Scale
08:49

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Published on: May 28, 2021

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06:43

Functional Assessment of Intestinal Tight Junction Barrier and Ion Permeability in Native Tissue by Ussing Chamber Technique

Published on: May 26, 2021

Area of Science:

  • Immunology
  • Dermatology
  • Pathogenesis of skin diseases

Background:

  • Atopic dermatitis (AD) pathogenesis traditionally linked to adaptive immune system dysregulation.
  • Key factors include T helper (Th) cell imbalance, IgE production, mast cell hyperactivity, and dendritic cell signaling.
  • Current therapies primarily target Th2-mediated inflammation and pruritus.

Purpose of the Study:

  • To review emerging evidence on the role of skin barrier dysfunction in AD pathogenesis.
  • To propose a shift in therapeutic strategies based on a new understanding of AD.
  • To highlight the importance of addressing primary barrier defects.

Main Methods:

  • Review of current scientific literature and emerging research on atopic dermatitis.
  • Analysis of the interplay between skin barrier function and immune responses.
  • Synthesis of evidence supporting a barrier-centric view of AD pathogenesis.

Main Results:

  • Evidence suggests that inflammation in AD occurs downstream of inherited and acquired insults to the skin barrier.
  • Primary barrier abnormalities allow unrestricted antigen access, driving inflammation.
  • This challenges the sole focus on adaptive immunity as the root cause.

Conclusions:

  • Inflammation in atopic dermatitis is a consequence of compromised skin barrier function.
  • Therapeutic approaches should prioritize correcting primary barrier defects.
  • Restoring barrier integrity is crucial for managing AD and preventing antigen exposure.