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Related Concept Videos

Anchoring Junctions01:03

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:...
Overview of Cell-Cell Junctions01:14

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
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Adherens Junctions01:24

Adherens Junctions

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
The endothelial cells...
Tight Junctions01:29

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...
Epithelial Tissues and Their Functions01:23

Epithelial Tissues and Their Functions

Epithelial tissues are large sheets of cells covering all of the surfaces of the body. These surfaces can be internal or external, for example, skin, airways, the digestive tract, the urinary system, and the reproductive system. Hollow organs and body cavities that do not connect to the body's exterior, including blood vessels and serous membranes, are lined by epithelial tissue known as the endothelium.
Epithelial tissues provide the body's first line of protection from physical, chemical, and...
Overview of Cell-Cell Junctions01:14

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.
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Junctions as organizing centers in epithelial cells? A fly perspective.

Thomas Lecuit1, Eric Wieschaus

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Epithelial junctions act as independent centers to establish and maintain cell polarity. These structures organize apical-basal polarity and influence cell division orientation.

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Area of Science:

  • Cell Biology
  • Developmental Biology
  • Genetics

Background:

  • Epithelial junctions are crucial for separating cell surfaces and establishing cell polarization.
  • Genetic studies in Drosophila have identified key proteins involved in junction formation.
  • These proteins form membrane-associated complexes essential for epithelial structure.

Purpose of the Study:

  • To review recent findings on the role of junctions in cell polarity.
  • To highlight junctions as autonomous organizing centers.
  • To explore their function in epithelial cells and other polarized processes.

Main Methods:

  • Literature review of recent genetic and cell biology studies.
  • Focus on findings related to junctional protein complexes.
  • Analysis of studies investigating apical-basal polarity establishment and maintenance.

Main Results:

  • Junctions function as autonomous organizing centers for apical-basal polarity.
  • They play a critical role in maintaining epithelial cell polarization.
  • Junctions also influence the orientation of the cell division apparatus.

Conclusions:

  • Recent research designates epithelial junctions as key regulators of cell polarity.
  • These structures are essential for both establishing and maintaining epithelial organization.
  • Their role extends to organizing other polarized cellular events.