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Related Concept Videos

Gap Junctions01:37

Gap Junctions

54.4K
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...
54.4K
Tight Junctions01:29

Tight Junctions

5.6K
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...
5.6K
Overview of Cell-Cell Junctions01:14

Overview of Cell-Cell Junctions

26.5K
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...
26.5K
Contact-dependent Signaling01:19

Contact-dependent Signaling

45.2K
Contact-dependent signaling, as the name suggests, requires that communicating cells be in direct contact with each other. This is achieved either through receptor-ligand interactions or by specialized cytoplasmic channels that allow the flow of small molecules between cells. In animal cells, channels called gap junctions facilitate contact-dependent signaling in certain tissues, whereas, plasmodesmata perform a similar function in plants.
Gap Junctions
In animal cells, gap junctions are formed...
45.2K
Anchoring Junctions01:03

Anchoring Junctions

4.0K
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:...
4.0K
Overview of Cell-Matrix Interactions01:24

Overview of Cell-Matrix Interactions

7.6K
The extracellular matrix or ECM holds cells together to form a tissue and allows the cells within the tissue to communicate. ECM comprises proteins such as fibronectin, collagen, laminin, etc. The most abundant protein in this space is collagen. Collagen fibers are interwoven with carbohydrate-containing protein molecules called proteoglycans. ECM allows cell migration and provides a structural scaffold at cell adhesion that anchors the cell when the extracellular matrix proteins interact with...
7.6K

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Related Experiment Video

Updated: Sep 29, 2025

Cut-loading: A Useful Tool for Examining the Extent of Gap Junction Tracer Coupling Between Retinal Neurons
10:11

Cut-loading: A Useful Tool for Examining the Extent of Gap Junction Tracer Coupling Between Retinal Neurons

Published on: January 12, 2012

15.5K

Gap junctions and hemichannels keep the RPE connected.

Ben Short

    The Journal of General Physiology
    |March 18, 2022
    PubMed
    Summary

    This study reveals how connexin-based gap junctions and hemichannels impact the electrical properties of the retinal pigment epithelium. Understanding these channels is key for retinal health research.

    Area of Science:

    • Ophthalmology
    • Cell Biology
    • Neuroscience

    Background:

    • The retinal pigment epithelium (RPE) plays a critical role in maintaining retinal function and integrity.
    • Electrical properties of the RPE are essential for photoreceptor health and visual processing.
    • Connexins form channels that mediate cell-to-cell communication and substance transport.

    Discussion:

    • Connexin-based gap junctions facilitate direct intercellular communication within the RPE.
    • Connexin hemichannels mediate non-junctional communication, releasing signaling molecules.
    • These channels are crucial regulators of RPE electrical activity and homeostasis.

    Key Insights:

    • The JGP study demonstrates a direct link between connexin channels and RPE electrical properties.

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    Primary Culture of Porcine Retinal Pigment Epithelial Cells
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    Primary Culture of Porcine Retinal Pigment Epithelial Cells

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    Related Experiment Videos

    Last Updated: Sep 29, 2025

    Cut-loading: A Useful Tool for Examining the Extent of Gap Junction Tracer Coupling Between Retinal Neurons
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    Endothelial Cell Transcytosis Assay as an In Vitro Model to Evaluate Inner Blood-Retinal Barrier Permeability
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    Primary Culture of Porcine Retinal Pigment Epithelial Cells
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  • Modulation of gap junctions and hemichannels significantly alters RPE electrical characteristics.
  • This highlights the functional importance of connexin-mediated transport and communication in the retina.

    • Outlook:

    • Further investigation into connexin channel function in retinal diseases.
    • Potential therapeutic targets for conditions affecting RPE electrical function.
    • Elucidating the precise mechanisms of connexin channel regulation in the RPE.