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Organic anions induce colinic secretion.

L Bustos-Fernández, E González, L L de Paolo

    The American Journal of Digestive Diseases
    |April 1, 1976
    PubMed
    Summary
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    Acetic acid at low pH is absorbed by the colon, which also absorbs fluid. This effect, unlike with hydrochloric acid, involves mucus discharge and may contribute to diarrheal diseases.

    Area of Science:

    • Gastroenterology
    • Physiology

    Background:

    • The colon's absorptive and secretory functions are crucial for maintaining fluid balance.
    • Understanding the impact of specific substances on colonic function is vital for diagnosing and treating gastrointestinal disorders.

    Purpose of the Study:

    • To investigate the effects of acetic acid and acetate ions on colonic fluid absorption and secretion in rats.
    • To compare the effects of acetic acid with hydrochloric acid at similar pH levels.

    Main Methods:

    • Anesthetized rats underwent colonic instillation of isotonic test solutions.
    • Solutions varied in pH (acidic 2.9 vs. neutral 7.0) and composition (acetic acid vs. acetate ions, hydrochloric acid).
    • Colonic fluid absorption and mucus discharge were monitored.

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    Main Results:

    • Acetic acid at pH 2.9 was well absorbed, and the colon absorbed fluid.
    • Hydrochloric acid at pH 2.9 did not induce a similar secretory effect.
    • Acetic acid-induced fluid secretion was linked to mucus release from goblet cells.

    Conclusions:

    • Acetic acid significantly influences colonic function, promoting fluid absorption and mucus secretion at acidic pH.
    • The observed effects of acetic acid are distinct from those of hydrochloric acid.
    • Acetic acid's interference with colonic absorption may play a role in the pathophysiology of certain diarrheal diseases.