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Related Experiment Videos

Occluding junctions of the Necturus gallbladder

M Cereijido, E Stefani, B Chávez de Ramírez

    The Journal of Membrane Biology
    |January 1, 1982
    PubMed
    Summary
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    The paracellular pathway in Necturus gallbladder epithelium shows even conductance distribution at occluding junctions. Despite structural variations, these junctions maintain consistent electrical properties across the cell layer.

    Area of Science:

    • Cell Biology
    • Physiology
    • Epithelial Transport

    Background:

    • The paracellular pathway facilitates ion and water transport across epithelial tissues.
    • Occluding junctions (tight junctions) are critical in regulating paracellular permeability.
    • Understanding these pathways is key to comprehending gallbladder function.

    Purpose of the Study:

    • To investigate the electrophysiological properties of the paracellular pathway in Necturus gallbladder.
    • To correlate electrical conductance with the ultrastructure of occluding junctions.
    • To map current flow across the apical surface of the gallbladder epithelium.

    Main Methods:

    • Electrophysiological techniques, including voltage scanning with microelectrodes.
    • Scanning electron microscopy (SEM) for surface morphology.

    Related Experiment Videos

  • Transmission electron microscopy (TEM) for ultrastructural details.
  • Freeze-fracture electron microscopy to analyze junctional complexes.

    • Main Results:

    • Electrical conductance is uniformly distributed along intercellular spaces containing occluding junctions.
    • Occluding junctions exhibit a 'bell-shaped' electrical field, detectable 1-2 microns away.
    • Cellular interdigitations and surface coats do not impede electrical conductance.
    • Junctional width and strand number increase at three-cell intersections, but conductance remains uniform.

    Conclusions:

    • The paracellular pathway in Necturus gallbladder is characterized by uniform conductance despite complex junctional structures.
    • Occluding junctions play a significant role in regulating paracellular transport.
    • Electrophysiological mapping complements ultrastructural analysis for a comprehensive understanding of epithelial function.