Abstract
The gut microbiota (GM) play a central role in their host's metabolism of bile acids (BAs) by regulating deconjugation, dehydroxylation, dehydrogenation, and epimerization reactions to generate unconjugated free BAs and secondary BAs. These BAs generated by the GM are potent signaling molecules that interact with BA receptors, such as the farnesoid X receptor and Takeda G-protein-coupled receptor 5. Each BA has a differential affinity to these receptors; therefore, alterations in BA composition by GM could modify the intensity of receptor signaling. Bile acids also act as antimicrobial agents by damaging bacterial membranes and as detergents by altering intracellular macromolecular structures. Therefore, BAs and the GM reciprocally control each other's compositions. In this review, we discuss the latest findings on the mutual effects of BAs and GM on each other; we also describe their roles in the pathophysiology of liver disease progression and potential therapeutic applications of targeting this cross-talk.
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