The mechanism of enterohepatic circulation in the formation of gallstone disease.
Level 5 - mechanism / opinion, no new human data
Narrative review of physiological mechanisms without original data
PubMed 25107305 · doi:10.1007/s00232-014-9715-3
What was done
This is a narrative review describing the physiological mechanisms of bile acid synthesis, transport, and enterohepatic circulation, and how disruptions in these pathways relate to gallstone formation.
What was found
The review describes bile acid kinetics: approximately 95% of bile acids are actively reabsorbed in the terminal ileum, leaving roughly 5% (approximately 0.5 g/day) to enter the colon, where anaerobic bacteria modify them via deconjugation and oxidation. Hepatocytes reabsorb bile acids from portal blood via specific transporters tightly regulated by nuclear receptors. The authors state that disturbances in bile acid transporters, nuclear receptors, and intestinal bacterial metabolism contribute to the pathogenesis of gallstone disease. No quantitative comparative data or clinical trial numbers are reported in the abstract.
Why it matters
It outlines how regulatory failure of bile acid transporters and altered gut microbiota metabolism disrupt bile acid homeostasis to promote gallstone disease.
Limits
This is a narrative review presenting mechanistic reasoning rather than empirical clinical data. The abstract provides no specific patient populations, sample sizes, or quantitative outcome measures.
Cited by
- supports Approximately 90 percent of bile is reabsorbed at the end of the small intestine and recycled.