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Lens gap junctions: a structural hypothesis for nonregulated low-resistance intercellular pathways.

D A Goodenough

    Investigative Ophthalmology & Visual Science
    |November 1, 1979
    PubMed
    Summary
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    Lens gap junctions maintain low resistance, unlike other tissues. Connexons resist crystallization, suggesting unique structural adaptations and lens vulnerability to injury.

    Area of Science:

    • Ophthalmology
    • Cell Biology
    • Biophysics

    Background:

    • Gap junctions are crucial for intercellular communication.
    • Lens fiber gap junctions differ functionally from those in other tissues.
    • Understanding lens connexon behavior is key to eye health.

    Purpose of the Study:

    • To investigate the structural basis for the low-resistance state of lens gap junctions.
    • To determine factors influencing connexon crystallization in the lens.
    • To compare lens connexons with those in other tissues.

    Main Methods:

    • Structural analysis of lens gap junctions under various conditions.
    • Rapid freezing experiments to assess connexon resistance.
    • Biochemical analysis including polyacrylamide gel electrophoresis of isolated junctions.

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    Main Results:

    • Lens connexons resist crystallization induced by fixation, anoxia, damage, or homogenization.
    • No cytoplasmic factor in liver was found to induce lens connexon crystallization.
    • Lens connexons share a similar polypeptide profile with hepatocyte gap junctions.

    Conclusions:

    • Lens gap junctions possess unique structural properties enabling a persistent low-resistance state.
    • These properties may contribute to the lens's susceptibility to injury.
    • Further research into lens connexon structure and function is warranted.