How your gut tells your liver to stop making bile
Deletion of the ileal basolateral bile acid transporter identifies the cellular sentinels that regulate the bile acid pool
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Deleting a transporter (Ostα) increased bile acid levels inside gut cells but decreased the total body bile acid pool.
Common sense says more bile inside cells = more bile overall. But here, the opposite happened: the body misreads local buildup as global excess and shuts down production, leading to a net loss.
Practical Takeaways
If you have chronic greasy stools or struggle with high-fat diets, consider bile acid binding supplements (like cholestyramine) or consult a doctor for bile acid malabsorption testing.
Not medical advice. For informational purposes only. Always consult a healthcare professional. Terms
Surprising Findings
Deleting a transporter (Ostα) increased bile acid levels inside gut cells but decreased the total body bile acid pool.
Common sense says more bile inside cells = more bile overall. But here, the opposite happened: the body misreads local buildup as global excess and shuts down production, leading to a net loss.
Practical Takeaways
If you have chronic greasy stools or struggle with high-fat diets, consider bile acid binding supplements (like cholestyramine) or consult a doctor for bile acid malabsorption testing.
Publication
Journal
Proceedings of the National Academy of Sciences
Year
2008
Authors
R. A. Davis, A. Attie
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Claims (5)
When mice lose a specific protein (Ostα/Ostβ) in their lower intestine, bile acids get stuck inside the gut cells instead of going back to the liver, which messes up the whole recycling system and reduces the total amount of bile acids in the body.
Only a small part of the mouse’s lower intestine — the very end of the small bowel — has the special cells that detect bile acids and send signals to the liver to control how much is made.
When mice can’t send bile acids out of their gut cells, the bile acids pile up inside the cells, tricking the body into thinking there’s too much bile acid overall — so the liver stops making more, even though the total amount in the body actually goes down.
The gut, not the liver, is the main control center that tells the liver when to stop making bile acids — when bile acids enter gut cells, they trigger a signal (FGF15) that shuts down bile acid production in the liver.
Human fat absorption is physiologically limited by bile acid pool size and enterohepatic circulation capacity, resulting in significant fecal fat loss when intake exceeds absorptive thresholds.