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Related Experiment Videos

Transepithelial transport in cell culture.

D S Misfeldt, S T Hamamoto, D R Pitelka

    Proceedings of the National Academy of Sciences of the United States of America
    |April 1, 1976
    PubMed
    Summary

    Madin-Darby Canine Kidney (MDCK) cells cultured on filters form a functional epithelial barrier. This model demonstrates stable transport and permeability properties, ideal for studying epithelial physiology.

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    Area of Science:

    • Cell Biology
    • Physiology
    • Biophysics

    Background:

    • Kidney epithelial cells in vivo form polarized, asymmetrical cell sheets.
    • These epithelia possess specific transport and permeability functions crucial for kidney physiology.
    • Studying these properties in vitro presents challenges due to cellular heterogeneity.

    Purpose of the Study:

    • To characterize the Madin-Darby Canine Kidney (MDCK) cell line as a model for in vitro epithelial research.
    • To assess the functional integrity of MDCK cell layers as a transporting epithelium.
    • To evaluate the utility of MDCK cells for studying cellular and subcellular transport mechanisms.

    Main Methods:

    • Culturing MDCK cells on permeable membrane filters to form a continuous epithelial sheet.
    • Utilizing an Ussing chamber for electrophysiological measurements.
    • Assessing barrier function via electrical resistance measurements.
    • Determining ion selectivity and water flux under controlled conditions.

    Main Results:

    • MDCK cell layers formed a continuous, asymmetrical epithelial sheet with occluding junctions.
    • The cell layer exhibited properties of in vivo transporting epithelia, including a transepithelial electrical potential (1.42 mV, apical negative).
    • High electrical resistance (84 ohms-cm2) indicated an effective permeability barrier, with cation selectivity (PNa/PCl = 1.7) and significant net water flux (7.3 μl cm-2 hr-1).

    Conclusions:

    • MDCK cells cultured on permeable supports provide a stable and reproducible model of a transporting epithelium.
    • This in vitro system effectively mimics in vivo epithelial barrier and transport functions.
    • The model's stability and homogeneity are advantageous for detailed investigations into epithelial transport processes.

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