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Related Concept Videos

Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal01:22

Role of Ephrin-Eph Signalling in Intestinal Stem Cell Renewal

Erythropoietin-producing hepatocellular carcinoma receptor (Eph) and its ligand, Eph receptor-interacting protein (Ephrin) were first discovered in the human carcinoma cell line, hence the name. Ephrin-Eph interaction guides cells to reach their appropriate location in adult tissues. They also play an essential role in the immune system by helping in immune cell migration, adhesion, and activation. Based on their structure and function, Eph is divided into two classes — EphA and EphB.
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:...
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
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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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Overview of Cell-Cell Junctions01:14

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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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Cell Polarization by Rho Proteins01:21

Cell Polarization by Rho Proteins

Cell polarity is the asymmetric distribution of cellular and membrane components, making one side of the cell different from the other. This polarity is essential to many processes such as embryogenesis, axon migration, glucose transport across epithelial cells, and directional cell migration. A migrating cell responds to intracellular or extracellular signals via molecular cascades that reorganize the actin cytoskeleton to establish this polarity. In these cells, the Rho family proteins Cdc42,...

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EphrinB1 controls cell-cell junctions through the Par polarity complex.

Hyun-Shik Lee1, Tagvor G Nishanian, Kathleen Mood

  • 1Laboratory of Cell and Developmental Signaling, National Cancer Institute-Frederick, Frederick, Maryland 21702, USA.

Nature Cell Biology
|July 8, 2008
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EphrinB1 signaling disrupts epithelial cell-cell adhesion by interacting with the Par polarity complex, potentially impacting cancer metastasis. This interaction affects tight junctions and cell boundaries.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Developmental Biology

Background:

  • Ephrin ligands are crucial for cell migration and tissue boundary formation.
  • Cell-cell adhesion is vital for morphogenesis, development, and preventing metastasis.
  • The intracellular signaling of ephrinB1 in regulating epithelial cell adhesion is not well understood.

Purpose of the Study:

  • To elucidate the mechanism by which ephrinB1 regulates cell-cell adhesion in epithelial cells.
  • To investigate the interaction between ephrinB1 and the Par polarity complex.
  • To determine the role of ephrinB1 signaling in maintaining tight junctions.

Main Methods:

  • Investigated the association of ephrinB1 with Par-6 protein.
  • Examined the competition between ephrinB1 and Cdc42 for Par-6 binding.
  • Assessed the effect of ephrinB1-Par-6 interaction on tight junction integrity.
  • Analyzed the impact of ephrinB1 intracellular domain tyrosine phosphorylation on its interaction with Par-6.

Main Results:

  • EphrinB1 associates with the Par polarity complex protein Par-6.
  • EphrinB1 competes with Cdc42 for binding to Par-6, leading to Par complex inactivation.
  • This interaction results in the loss of tight junctions in epithelial cells.
  • Tyrosine phosphorylation of ephrinB1's intracellular domain disrupts its interaction with Par-6.

Conclusions:

  • A novel mechanism for ephrinB1 signaling in regulating epithelial cell-cell junctions has been identified.
  • EphrinB1's interaction with the Par complex plays a key role in maintaining tight junctions.
  • Understanding this pathway may inform therapeutic strategies for metastatic diseases.