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Related Experiment Videos

Physiological modulation of gap junction permeability.

J Neyton, A Trautmann

    The Journal of Experimental Biology
    |September 1, 1986
    PubMed
    Summary
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    Cellular communication via gap junctions is modulated by intracellular second messengers. New research uses advanced techniques to explore how these molecules control junctional conductance at the single-channel level.

    Area of Science:

    • Cell Biology
    • Biophysics
    • Physiology

    Background:

    • Cells communicate via gap junctions, forming intercellular channels permeable to ions and small molecules.
    • Gap junction communication is regulated by intracellular and extracellular factors, including hormones and neurotransmitters acting through second messengers.
    • The precise mechanisms by which second messengers modulate gap junction function remain largely unknown.

    Purpose of the Study:

    • To investigate the role of intracellular second messengers in regulating gap junction channel activity.
    • To elucidate how molecules like Ca2+, H+, and cyclic AMP influence junctional conductance.
    • To examine the single-channel properties and gating mechanisms of gap junctions under various conditions.

    Main Methods:

    • Application of the double patch-clamp technique to control intracellular conditions and measure transjunctional currents.

    Related Experiment Videos

  • High-resolution analysis of single gap junction channels.
  • Modulation of intracellular milieu to study effects on junctional conductance.

    • Main Results:

    • The double patch-clamp technique allows detailed examination of gap junction modulation at the single-channel level.
    • It is now possible to quantify changes in the number of open channels and their elementary properties.
    • Insights into how intracellular molecules affect junctional conductance are being gained.

    Conclusions:

    • Advanced electrophysiological techniques are crucial for understanding gap junction regulation.
    • Further research is needed to fully identify and characterize the second messengers involved in gap junction modulation.
    • Understanding these mechanisms is key to comprehending cellular communication and tissue function.