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Related Experiment Videos

Base secretion in rat distal colon: ionic requirements.

G M Feldman1, J D Koethe, R L Stephenson

  • 1Department of Medicine, Veterans Administration Medical Center, Philadelphia, Pennsylvania.

The American Journal of Physiology
|June 1, 1990
PubMed
Summary
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Colonic base secretion relies on bicarbonate (HCO3-) entering from the serosal side, driven by sodium (Na+), and exiting the apical side in exchange for chloride (Cl-). This process is crucial for maintaining colonic function.

Area of Science:

  • Physiology
  • Gastroenterology

Background:

  • Colonic base secretion is vital for maintaining intestinal homeostasis.
  • Understanding the ionic mechanisms is key to understanding colonic function.

Purpose of the Study:

  • To elucidate the specific ionic requirements for colonic base secretion.
  • To differentiate between active and diffusive components of base flux.

Main Methods:

  • Studied short-circuited rat distal colon segments.
  • Manipulated ion concentrations (HCO3-, Na+, Cl-) in bathing solutions.
  • Measured net base flux and characterized diffusive components.

Main Results:

  • Active base secretion depends on serosal HCO3- concentration, saturating at 33 mM, and is ouabain-sensitive.

Related Experiment Videos

  • A diffusive component with a HCO3- permeability of 8.9 x 10(-6) cm/s was identified.
  • Secretion was inhibited by reduced serosal Na+ or mucosal Cl- concentrations.

    • Conclusions:

    • Colonic base secretion involves Na+-dependent HCO3- entry across the basolateral membrane.
    • HCO3- exits the apical surface via Cl- exchange.
    • These ionic movements are essential for net base secretion in the distal colon.