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Related Concept Videos

Physiology of Enteric Nervous System and Gut Health01:05

Physiology of Enteric Nervous System and Gut Health

The gastrointestinal tract, responsible for the digestion and absorption of nutrients, is safeguarded by the intestinal barrier, which consists of secretory, physical, and immune components. At the forefront is the secretory barrier, composed of essential elements such as mucus, gut microbiota, and defense proteins. They collaborate to break down food particles, facilitate nutrient absorption, and maintain optimal gut health. These secretory components ensure the smooth functioning of 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...
Renewal of Intestinal Stem Cells01:23

Renewal of Intestinal Stem Cells

The intestinal epithelial lining rapidly renews every 4 to 5 days. The renewal is facilitated by intestinal stem cells (ISCs) located at the base of the crypt– a gland located at the bottom of each villus. ISCs divide asymmetrically to form new stem cells and progenitor daughter cells. The daughter cells are called transit-amplifying (TA) cells which move upwards along the crypt and either differentiate into absorptive cells– the enterocytes or secretory cells– including the goblet,...
Mucosal Barrier of the Stomach01:25

Mucosal Barrier of the Stomach

The gastric glands contain parietal cells that secrete hydrochloric acid (HCl) for digestion. The cells secrete HCl because it is highly corrosive and essential for breaking down food. To achieve this, they secrete hydrogen and chloride ions into the lumen of the gastric glands, which combine to form HCl.
Within parietal cells, carbonic acid is first formed through the reaction of water and carbon dioxide. The dissociation of carbonic acid releases bicarbonate and hydrogen ions. The bicarbonate...
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...
Cellular Membranes and Drug Transport01:24

Cellular Membranes and Drug Transport

Drugs must traverse multiple biological barriers, such as multi-layered skin, single-layered intestinal epithelium, and the plasma membrane, to reach their target sites within the body. The plasma membrane, a highly structured composite of phospholipids, carbohydrates, and proteins, is the cell's protective boundary, facilitating selective substance exchange.
Phospholipids arrange themselves into a bilayer, with hydrophilic heads oriented outward and hydrophobic tails facing inward.

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Related Experiment Video

Updated: Jun 13, 2026

Basic Three-Dimensional (3D) Intestinal Model System with an Immune Component
07:39

Basic Three-Dimensional (3D) Intestinal Model System with an Immune Component

Published on: September 1, 2023

The Intestinal Barrier: A Multilayered Gatekeeper Against Systemic Disease.

Jun Wakabayashi1,2, Katsunori Kimura1,2, Takeshi Kawauchi1,3

  • 1Department of Adaptive and Maladaptive Responses in Health and Disease, Graduate School of Medicine, Kyoto University, Kyoto, Japan, kyoto-u.ac.jp.

International Journal of Microbiology
|June 12, 2026
PubMed
Summary
This summary is machine-generated.

The intestinal barrier, crucial for nutrient absorption and pathogen defense, comprises four layers. Its disruption, or "leaky gut," can trigger systemic inflammation and disease, necessitating effective restoration strategies.

Keywords:
chemical barriergut–brain axisgut–kidney axisgut–liver axisgut–muscle axisimmunological barrierintestinal barrierleaky gutmicrobiological barrierphysical barrier

More Related Videos

Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes
08:14

Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes

Published on: May 8, 2016

Related Experiment Videos

Last Updated: Jun 13, 2026

Basic Three-Dimensional (3D) Intestinal Model System with an Immune Component
07:39

Basic Three-Dimensional (3D) Intestinal Model System with an Immune Component

Published on: September 1, 2023

Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes
08:14

Isolation and Flow Cytometric Characterization of Murine Small Intestinal Lymphocytes

Published on: May 8, 2016

Area of Science:

  • Gastroenterology and Immunology
  • Physiology
  • Microbiology

Background:

  • The intestine balances nutrient absorption with defense against pathogens via a multilayered barrier.
  • This barrier consists of physical, chemical, microbiological, and immunological components.
  • Disruption leads to increased intestinal permeability ('leaky gut'), allowing systemic translocation.

Purpose of the Study:

  • To delineate the four layers of the intestinal barrier.
  • To explore the systemic consequences of intestinal barrier disruption.
  • To summarize current assessment methods and therapeutic strategies for barrier restoration.

Main Methods:

  • Review of existing literature on intestinal barrier structure and function.
  • Analysis of regional differences in barrier integrity between small and large intestines.
  • Synthesis of data on systemic inflammatory responses triggered by barrier dysfunction.

Main Results:

  • Barrier dysfunction varies regionally (small vs. large intestine) due to differences in epithelium, mucus, and microbiota.
  • Disrupted intestinal barrier triggers inflammation in distant organs (liver, brain, kidneys, muscles).
  • Current therapeutic strategies include diet, microbiota modulation, postbiotics, and lifestyle changes.

Conclusions:

  • Understanding the intestinal barrier's complexity is vital for preventing and treating systemic diseases.
  • Restoring barrier integrity is key to strengthening defense against pathogens and maintaining physiological function.
  • Novel therapeutic approaches are needed to address the systemic impact of leaky gut.