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Related Experiment Videos

Cellular organization of urinary acidification.

P R Steinmetz

    The American Journal of Physiology
    |August 1, 1986
    PubMed
    Summary

    Turtle bladder cells actively transport substances. Carbonic anhydrase (CA) cells adjust membrane area for proton secretion, while other cells manage bicarbonate transport, revealing specialized functions in urinary acidification.

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    Area of Science:

    • Cell biology
    • Physiology
    • Urology

    Background:

    • Turtle bladders possess distinct epithelial cells for active sodium absorption, proton secretion, and bicarbonate secretion.
    • Intracellular acid-base balance significantly impacts cellular structures involved in transport.

    Purpose of the Study:

    • To investigate the cellular mechanisms and structural adaptations underlying active transport in turtle bladder epithelium.
    • To elucidate the roles of different cell types, specifically alpha-type and beta-type carbonic anhydrase (CA) cells, in urinary acidification and bicarbonate secretion.

    Main Methods:

    • Utilized freeze-fracture electron microscopy to examine cell membrane structures.
    • Manipulated PCO2 levels to observe cellular responses in alpha-CA and beta-CA cells.
    • Correlated structural changes with physiological measurements of proton secretion rates (JH).

    Main Results:

    • Alpha-CA cells dynamically alter apical membrane area in response to PCO2 changes, correlating with proton secretion rates (JH).
    • Beta-type CA cells, with apical microvilli, show basolateral localization of specific membrane particles (RSPs) and studs, suggesting a role in bicarbonate secretion.
    • Proton secretion (JH) is influenced by apical membrane area, RSP numbers, and the electrochemical gradient (delta microH).

    Conclusions:

    • Turtle bladder epithelium exhibits functional specialization, with alpha-CA cells mediating proton secretion and beta-CA cells responsible for bicarbonate secretion.
    • Structural plasticity of the apical membrane in alpha-CA cells is a key regulatory mechanism for urinary acidification.
    • Rod-shaped intramembrane particles (RSPs) and studs are proposed as components of proton channels and pumps, respectively, integral to active transport.

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