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Related Concept Videos

Tight Junctions01:29

Tight Junctions

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Tight junctions are molecular seals between cells that prevent the leaking of fluids, ions, and other small solutes across cavities and compartments in multicellular organisms. They are mainly composed of claudin and occludin transmembrane proteins, and other proteins such as tricellulin and JAM (junctional adhesion molecule). All these proteins are 4-pass transmembrane proteins, except JAM, which is a single-pass transmembrane protein belonging to the immunoglobulin superfamily. The...
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Mucosal Barrier of the Stomach01:25

Mucosal Barrier of the Stomach

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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...
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Bile01:19

Bile

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Bile is a crucial bodily fluid, characterized by its yellow-green color and alkaline nature. Produced in the liver, it is transported through the common hepatic duct into either the cystic duct, leading to the gallbladder, or directly into the common bile duct. The flow of bile is regulated by the sphincter of Oddi located at the entrance of the duodenum. When this sphincter is closed, bile is redirected to the gallbladder for storage and concentration.
Bile is released when dietary fats enter...
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Classification of Epithelial Tissues: Simple Epithelium01:30

Classification of Epithelial Tissues: Simple Epithelium

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Simple epithelium consists of a single layer of cells that lines body cavities and blood vessels. The shape of the cells in the epithelium reflects the function of the tissue. Cells in simple squamous epithelium appear as thin scales with flat, elliptical nuclei that mirror the form of the cell.
Because of the thinness of the cells, simple squamous epithelium is present where the rapid passage of chemical compounds is observed. For example, the endothelium that lines the capillaries and vessels...
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Surface Membrane Barriers01:18

Surface Membrane Barriers

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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...
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Overview of Cell-Cell Junctions01:14

Overview of Cell-Cell Junctions

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The complex three-dimensional arrangement of cells in any multicellular organism is defined and maintained by interactions of cells with each other and the extracellular matrix. Cell-cell junctions are specialized structures where the multi-protein complexes on one cell interact with the multi-protein complexes on another  cell. These cell junctions are classified  into three main types based on their function — occluding, anchoring, and gap junctions.
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Related Experiment Video

Updated: May 1, 2026

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

Published on: May 26, 2021

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Bile duct epithelial tight junctions and barrier function.

R K Rao1, G Samak2

  • 1Department of Physiology; University of Tennessee Health Science Center; Memphis, TN USA.

Tissue Barriers
|March 26, 2014
PubMed
Summary
This summary is machine-generated.

Bile duct epithelium forms a critical barrier, but its tight junction regulation is poorly understood. Further research is needed to understand bile duct tight junction mechanisms and their role in liver disease.

Keywords:
ZO-1barrier functionbile canaliculuscholangiocytecholangitisclaudinsoccludin

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Related Experiment Videos

Last Updated: May 1, 2026

Functional Assessment of Intestinal Tight Junction Barrier and Ion Permeability in Native Tissue by Ussing Chamber Technique
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Sensing of Barrier Tissue Disruption with an Organic Electrochemical Transistor
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Extrahepatic Bile Duct and Gall Bladder Dissection in Nine-Day-Old Mouse Neonates
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Area of Science:

  • Hepatology and Gastroenterology
  • Cell Biology
  • Molecular Biology

Background:

  • Bile ducts are vital for bile secretion and xenobiotic excretion.
  • The bile duct epithelium acts as a barrier against toxic substances in bile.
  • Disrupted barrier function contributes to liver diseases like primary sclerosing cholangitis and cholangiocarcinoma.

Purpose of the Study:

  • To review the current understanding of bile duct epithelium physiology and pathophysiology.
  • To explore the structure and regulation of tight junctions in bile duct epithelia.
  • To identify mechanisms involved in the disruption and protection of bile duct epithelial tight junctions.

Main Methods:

  • Literature review and synthesis of existing research on bile duct epithelium and tight junctions.
  • Analysis of current knowledge regarding tight junction structure and regulation in various tissues.
  • Identification of knowledge gaps concerning bile duct epithelial tight junctions.

Main Results:

  • While tight junction research is advanced in other tissues, knowledge specific to bile ducts remains limited.
  • Understanding the molecular organization and regulation of bile duct tight junctions is crucial.
  • Mechanisms of tight junction disruption and protection in bile ducts require further investigation.

Conclusions:

  • There is a significant need for more research into the molecular underpinnings of bile duct epithelial tight junctions.
  • Elucidating these mechanisms is essential for understanding and potentially treating liver diseases.
  • Future investigations should focus on the detailed molecular organization and regulatory pathways of these critical cellular structures.