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Tight Junctions

Tight Junctions

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...

Overview of Cell-Cell Junctions

Overview of Cell-Cell Junctions

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.
Occluding or Tight Junctions
Tight...

Overview of Cell-Cell Junctions

Overview of Cell-Cell Junctions

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.
Occluding or Tight Junctions
Tight...

Anchoring Junctions

Anchoring Junctions

Anchoring junctions are multiprotein complexes that help cells connect to other cells and the extracellular matrix. Anchoring junctions are present on the lateral and basal surfaces of cells, providing strong and flexible connections. Focal adhesions are often formed due to cell interactions with the ECM substrata, which initiate signal transduction via kinase cascades and other mechanisms. Together, they provide stability and tissue integrity. There are three types of anchoring junctions:...

Tension Response at Adherens Junctions

Tension Response at Adherens Junctions

The adherens junctions that anchor cells together are multi-protein complexes that dynamically adapt to mechanical stimuli such as tensile forces and shear stress. Mechanosensory proteins in these junctions can sense such mechanical stimuli and undergo a shift in their conformation, resulting in an altered function — a process called mechanotransduction.
α-Catenin as a Mechanosensory Protein
The α-catenin of adherens junctions is an allosteric protein with three VH (vinculin homology) domains...

Gap Junctions

Gap Junctions

Multicellular organisms employ a variety of ways for cells to communicate with each other. Gap junctions are specialized proteins that form pores between neighboring cells in animals, connecting the cytoplasm between the two, and allowing for the exchange of molecules and ions. They are found in a wide range of invertebrate and vertebrate species, mediate numerous functions including cell differentiation and development, and are associated with numerous human diseases, including cardiac and...

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Related Experiment Video

Updated: Jun 17, 2026

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

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

Published on: May 26, 2021

Dynamics and functions of tight junctions.

Emily Steed¹, Maria S Balda, Karl Matter

¹Department of Cell Biology, UCL Institute of Ophthalmology, University College London, Bath Street, London EC1V 9EL, UK.

Trends in Cell Biology

|January 12, 2010

Summary

This summary is machine-generated.

Tight junctions, crucial for barrier function, were once thought rigid. New research reveals their dynamic nature, essential for regulating permeability and cell signaling.

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Last Updated: Jun 17, 2026

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

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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Published on: February 10, 2014

Area of Science:

Cell Biology
Molecular Biology
Biophysics

Background:

Tight junctions are vertebrate intercellular adhesion complexes vital for epithelial and endothelial barrier function.
Traditionally viewed as rigid structures due to their complex protein composition, their dynamic nature was underestimated.

Purpose of the Study:

To challenge the traditional view of tight junctions as static structures.
To highlight the importance of dynamic properties in tight junction function.
To integrate dynamic aspects into current models for a deeper understanding.

Main Methods:

Review of recent observational data on tight junction protein dynamics.
Analysis of existing literature on tight junction structure and function.
Theoretical modeling integrating dynamic properties.

Main Results:

Evidence suggests that specific tight junction elements and proteins exhibit significant dynamism.
These dynamic properties are crucial for regulating paracellular permeability.
Dynamic junctional components play roles in cell-associated signaling pathways.

Conclusions:

Tight junctions possess dynamic characteristics that are fundamental to their biological roles.
Understanding these dynamics is key to advancing models of epithelial and endothelial barrier function.
Future research should focus on integrating these dynamic properties into functional models.