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Fluid transport by gallbladder epithelium.

K R Spring

    The Journal of Experimental Biology
    |September 1, 1983
    PubMed
    Summary
    This summary is machine-generated.

    Fluid absorption in epithelial tissues relies on hypertonic regions. High cell membrane water permeability in Necturus gallbladder means small osmotic gradients drive fluid transport, primarily through cells, not tight junctions.

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    Area of Science:

    • Physiology
    • Cell Biology
    • Biophysics

    Background:

    • Epithelial fluid absorption is linked to internal hypertonic regions.
    • Estimating osmotic gradients requires understanding epithelial cell membrane water permeability.
    • Previous models highlighted the need for precise water permeability data.

    Purpose of the Study:

    • To measure the hydraulic water permeability of individual Necturus gallbladder epithelial cell membranes.
    • To determine the osmotic gradients necessary for normal fluid absorption rates.
    • To elucidate the primary pathway for osmotically induced fluid flow across the epithelium.

    Main Methods:

    • Quantitative light microscopy was employed to measure water permeability.
    • Osmotic gradients were calculated based on measured water permeabilities and fluid transport rates.

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  • The relative contributions of transcellular and paracellular pathways to fluid absorption were analyzed.

    • Main Results:

    • Necturus gallbladder cell membranes exhibit high hydraulic water permeability.
    • Small osmotic gradients (approx. 2 mosmol kg-1 intracellularly, 1 mosmol kg-1 basolaterally) are sufficient for fluid absorption.
    • Absorbed fluid is slightly hypertonic to bathing solutions.
    • Osmotically induced fluid flow occurs predominantly via the transcellular route.

    Conclusions:

    • High cell membrane water permeability minimizes the osmotic gradients needed for epithelial fluid absorption.
    • The transcellular pathway is the dominant route for osmotically driven fluid transport due to high cell membrane permeability and limited tight junction area.
    • These findings refine our understanding of fluid transport mechanisms in epithelial tissues.