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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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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...

Gap Junctions

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The cytoplasm of adjacent animal cells can exchange small molecules, ions, and secondary messengers via the communication channels which form the gap junctions. These junctions comprise a few hundred to thousands of molecular channels, each made of two halves, called the connexon hemichannel. A connexon is a hexamer of six transmembrane connexin proteins, which assemble radially, thus forming a pore or channel in the center. One connexon hemichannel docks with a corresponding connexon on the...

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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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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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Characterizing Epithelial Wound Healing In Vivo Using the Cnidarian Model Organism Clytia hemisphaerica

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Cell junctions: lessons from a broken heart.

Kevin S Nelson¹, Greg J Beitel

¹Department of Biochemistry, Northwestern University, Evanston, IL 60208, USA.

Current Biology : CB

|February 13, 2009

Summary

This summary is machine-generated.

The Drosophila heart requires septate-junction proteins for integrity, despite lacking visible septate junctions. This study reveals a surprising role for these proteins in cardiac function.

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Area of Science:

Developmental Biology
Cell Biology
Cardiovascular Research

Background:

Septate junctions are crucial for epithelial barrier function in invertebrates.
Their role in non-epithelial tissues, like the heart, is largely unexplored.
Drosophila melanogaster serves as a model organism for studying fundamental biological processes.

Purpose of the Study:

To investigate the role of septate junction proteins in the Drosophila cardiac system.
To determine if septate junction proteins are essential for maintaining heart integrity, even in the absence of morphologically apparent septate junctions.

Main Methods:

Utilized genetic manipulation to alter the expression or function of key septate junction proteins in Drosophila.
Employed in vivo imaging techniques to assess cardiac function and integrity.
Performed histological analyses to examine cardiac tissue structure.

Main Results:

Loss or misregulation of specific septate junction proteins led to defects in cardiac integrity and function.
These proteins were found to be localized within cardiac cells, suggesting an intracellular or plasma membrane role.
The study identified a novel function for septate junction proteins in supporting the Drosophila heart.

Conclusions:

Septate junction proteins are essential for maintaining Drosophila cardiac system integrity.
This finding challenges the traditional view of septate junctions being exclusively for epithelial barriers.
The research highlights a conserved role for these proteins in cardiac development and function across species.