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Related Concept Videos

Tight Junctions01:29

Tight Junctions

6.8K
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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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.
Occluding or Tight...
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Overview of Cell-Cell Junctions01:14

Overview of Cell-Cell Junctions

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Anchoring Junctions01:03

Anchoring Junctions

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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:...
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Adherens Junctions01:24

Adherens Junctions

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Strong contact points between adjacent cells anchor them to each other, forming tissues. Such anchoring junctions are of two types –  adherens junctions and desmosomes. Adherens junctions are abundant in tissues such as  epithelium and endothelium, forming a continuous zone of adhesion called the adhesion belt. In other tissues, such as  heart muscle, they appear as clusters, linking the cells to produce coordinated heart muscle contraction.
Adherens Junctions are Dynamic
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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.
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Related Experiment Video

Updated: Apr 30, 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

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SnapShot: Epithelial tight junctions.

Karl Matter1, Maria S Balda1

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

Cell
|May 13, 2014
PubMed
Summary
This summary is machine-generated.

Tight junctions create a barrier between cell surfaces, controlling what passes through. They are crucial for cell polarity and signaling, influencing cell behavior and gene expression.

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Area of Science:

  • Cell Biology
  • Epithelial Biology
  • Molecular Biology

Background:

  • Tight junctions establish distinct apical and basolateral cell surface domains.
  • They function as a paracellular diffusion barrier, separating compartments of differing composition.
  • Tight junctions are vital for maintaining epithelial cell polarity and regulating signaling pathways.

Purpose of the Study:

  • To illustrate the components of tight junctions.
  • To describe the organization of tight junctions.
  • To explain the diverse functions of tight junctions in epithelial cells.

Main Methods:

  • Review of existing literature and research on tight junction structure and function.
  • Analysis of morphological and functional data related to tight junctions.
  • Synthesis of information on signaling mechanisms regulated by tight junctions.

Main Results:

  • Tight junctions are complex protein structures that form a seal between epithelial cells.
  • They effectively regulate the passage of molecules through the paracellular space.
  • These junctions play a key role in cell shape determination and gene expression modulation.

Conclusions:

  • Tight junctions are essential for epithelial barrier function and cell polarity.
  • Their components and organization are critical for regulating cellular processes.
  • Understanding tight junction function provides insights into epithelial biology and disease.