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Electrolyte transport across the rabbit caecum in vitro
1Department of Zoology and Physiology, Louisiana State University, Baton Rouge 70803.
Pflugers Archiv : European Journal of Physiology
|March 1, 1988
Summary
Rabbit caecal epithelium absorbs sodium via electrogenic and electroneutral pathways. Chloride absorption is electroneutral, potentially involving coupled Na+/H+ and Cl-/HCO3- antiport systems for electrolyte transport.
Area of Science:
- Physiology
- Gastroenterology
- Epithelial Transport
Background:
- The caecum plays a crucial role in electrolyte and water absorption.
- Understanding the mechanisms of ion transport in the caecum is vital for comprehending overall gastrointestinal function.
Purpose of the Study:
- To investigate the in vitro electrolyte transport mechanisms across the rabbit caecal epithelium.
- To elucidate the pathways for sodium and chloride absorption and potassium secretion.
Main Methods:
- Conventional short-circuit current (Isc) technique.
- Radioisotope flux measurements.
- Pharmacological manipulation with specific inhibitors (acetazolamide, amiloride, DIDS, bumetanide) and stimulants (theophylline).
Main Results:
- Rabbit caecal epithelium exhibits significant net sodium and chloride absorption and potassium secretion.
- Sodium absorption occurs through both electrogenic and electroneutral mechanisms.
- Chloride absorption is primarily electroneutral, possibly mediated by Na+/H+ and Cl-/HCO3- antiport systems.
- A Na+-dependent bicarbonate secretion contributes to the short-circuit current.
Conclusions:
- Net sodium absorption in rabbit caecum involves both active and passive transport processes.
- Electroneutral chloride absorption is coupled to sodium transport.
- The caecum utilizes distinct mechanisms for electrolyte absorption and secretion, contributing to homeostasis.