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Human jejunal secretion induced by prostaglandin E1: a dose-response study.
British Journal of Clinical Pharmacology
|April 1, 1991
Summary
Prostaglandin E1 (PGE1) triggers dose-dependent secretion of water and electrolytes in the human jejunum. This suggests a saturable, receptor-mediated mechanism in intestinal cells, crucial for drug development.
Area of Science:
- Gastroenterology
- Pharmacology
- Physiology
Background:
- Prostaglandins are known to induce jejunal secretion of water and electrolytes.
- A receptor-mediated process in intestinal epithelial cells is hypothesized to explain this secretion.
Purpose of the Study:
- To investigate the dose-response effect of prostaglandin E1 (PGE1) on jejunal hydroelectrolytic movements in healthy volunteers.
- To gather data under basal conditions for pharmacological studies.
Main Methods:
- Healthy volunteers received intraluminal infusions of PGE1 in isotonic saline via a four-lumen tube.
- A 40 cm jejunal segment was isolated using an occluding balloon.
- Seven randomized doses of PGE1 were administered, and water and electrolyte transport was measured.
Main Results:
- PGE1 induced a dose-dependent and saturable secretion of water, sodium (Na+), potassium (K+), and chloride (Cl-).
- The mean Km was approximately 6-8 pmol kg-1 min-1, indicating a saturable membrane site akin to a receptor on enterocytes.
- These effects were observed across the tested pharmacological dose range.
Conclusions:
- The findings suggest that enterocytes possess a saturable membrane site, likely a receptor, for PGE1.
- This receptor-mediated mechanism is significant for understanding prostaglandin actions in the jejunum.
- Results have implications for the clinical use of prostaglandins as drugs or secretory agents and for evaluating antisecretory drugs.