Bile acid pool hydrophobicity modulation

Modulation of bile acid pool hydrophobicity refers to altering the proportion and types of hydrophobic and hydrophilic bile acids in the enterohepatic circulation. Hydrophobic bile acids (such as deoxycholic acid [DCA] and chenodeoxycholic acid [CDCA]) are more cytotoxic and contribute to tissue injury, inflammation, and apoptosis—particularly in the liver—while hydrophilic bile acids (such as ursodeoxycholic acid [UDCA]) have cytoprotective properties. The composition of the bile acid pool is regulated by hepatic synthesis, microbial transformation, and enterohepatic circulation. Changing the hydrophobicity of the bile acid pool is a therapeutic goal in liver disease, metabolic syndrome, and gut inflammatory conditions, usually achieved by drugs (e.g., UDCA, FXR agonists), microbiota modification, or bile acid sequestrants. However, "bile acid pool hydrophobicity modulation" is a biological strategy or outcome, not a discrete molecular entity, and does not correspond to a specific receptor, enzyme, or protein that can be directly targeted. Instead, it encompasses multiple pathways and molecules involved in bile acid metabolism and signaling.

Other names

Modulation of bile acid hydrophobicityAlteration of bile acid pool compositionBile acid composition shift

Hydrophilic bile acids (e.g., UDCA) displace hydrophobic, cytotoxic bile acids from the pool, decreasing cellular toxicity FXR agonists change hepatic bile acid synthesis, shifting the profile away from hydrophobic, toxic acids Bile acid sequestrants bind bile acids in the gut, altering the reabsorption and composition of the circulating pool Modulating gut microbiota composition shifts bile acid metabolism and pool hydrophobicity