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Cell junctions and intercellular communication

J P Revel, S B Yancey, D J Meyer

    In Vitro
    |December 1, 1980
    PubMed
    Summary
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    Intercellular communication in regenerating rat liver shows reduced gap junctions but maintained hepatocyte coupling. Dye spread is limited, reconciling morphological and physiological data.

    Area of Science:

    • Cell biology
    • Hepatology
    • Regenerative medicine

    Background:

    • Intercellular communication is vital for liver function.
    • Gap junctions mediate direct cell-to-cell communication.
    • Liver regeneration involves complex cellular changes.

    Purpose of the Study:

    • To compare intercellular communication in normal and regenerating rat liver.
    • To investigate changes in gap junctions during liver regeneration.
    • To reconcile discrepancies between morphological and physiological data.

    Main Methods:

    • Electrophysiological recordings to assess hepatocyte coupling.
    • Dye spread studies (e.g., carboxyfluorescein) to evaluate intercellular communication.
    • Analysis of gap junction protein biosynthesis and N-terminal sequence.

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    Main Results:

    • Gap junctions were significantly reduced in size and number 29-35 hr post-hepatectomy.
    • Despite reduced gap junctions, ~90% of hepatocytes remained coupled electrophysiologically.
    • Carboxyfluorescein spread was markedly limited in regenerating liver compared to controls.

    Conclusions:

    • Morphological and physiological data on gap junction function during liver regeneration can be reconciled.
    • Limited dye spread suggests functional alterations in gap junctions despite maintained electrical coupling.
    • Preliminary data on gap junction protein biosynthesis provides insights into regulatory mechanisms.