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Related Experiment Videos

Active potassium secretion by rabbit proximal colon.

S K Sullivan, P L Smith

    The American Journal of Physiology
    |April 1, 1986
    PubMed
    Summary
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    Rabbit colon actively secretes potassium (K) from the mucosa to the serosa. This net K secretion occurs in both proximal and distal colon, but the proximal colon lacks an active K uptake mechanism at the apical membrane.

    Area of Science:

    • Physiology
    • Gastroenterology
    • Ion Transport

    Background:

    • Potassium (K) transport in the colon is crucial for maintaining electrolyte balance.
    • Understanding the mechanisms of K flux in different regions of the colon is essential for comprehending colonic function.

    Purpose of the Study:

    • To investigate the unidirectional and net fluxes of potassium (K) across the rabbit proximal and distal colon in vitro.
    • To elucidate the characteristics of K transport, including saturable and non-saturable components, and the involvement of specific ion transporters and conditions.

    Main Methods:

    • Experiments were conducted using stripped preparations of rabbit proximal and distal colon in Ussing chambers under short-circuit conditions.
    • Radioisotopic fluxes of K were measured to determine unidirectional and net transport.

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  • The effects of ouabain, barium, bumetanide, and chloride (Cl) removal on K fluxes were assessed.

    • Main Results:

    • Steady-state radioisotopic K fluxes were achieved and remained constant for at least 2 hours.
    • Serosal-to-mucosal K flux exhibited both saturable and non-saturable components, with the saturable part abolished by ouabain.
    • Under basal conditions, net K secretion was observed in both proximal and distal colon, with proximal colon lacking apical K uptake.

    Conclusions:

    • Rabbit proximal colon actively secretes K, similar to the distal colon.
    • The proximal colon does not possess an active K uptake mechanism at the apical cell membrane, distinguishing it from the distal colon.
    • Chloride removal significantly affected K transport in the distal colon, suggesting a role in K absorption in that region.