Bile Acid Receptors and Gastrointestinal Functions

Area of Science:

• Gastroenterology
• Endocrinology
• Molecular Biology

Background:

• Bile acids regulate gastrointestinal functions, including motility and electrolyte transport.
• Disruptions in bile acid homeostasis are linked to gastrointestinal disorders such as irritable bowel syndrome (IBS) and inflammatory bowel disease (IBD).
• High bile acid concentrations are associated with diarrhea and increased risk of gastrointestinal cancers.

Purpose of the Study:

• To review the functional roles of bile acid receptors in the gastrointestinal tract.
• To highlight the mechanisms by which bile acids influence gut physiology and disease.
• To discuss the therapeutic potential of targeting bile acid receptors.

Main Methods:

• Literature review of studies on bile acid receptors and their functions.
• Analysis of research on nuclear receptors (FXR, VDR, PXR, CAR) and G protein-coupled receptors (TGR5, S1PR2, M3R).
• Synthesis of evidence regarding the involvement of these receptors in gastrointestinal functions and diseases.

Main Results:

• Bile acid receptors, including FXR and TGR5, mediate various gut functions and inflammatory responses.
• Activation of TGR5 in enteric neurons increases colonic motility, potentially causing bile acid-induced diarrhea.
• TGR5 activation stimulates GLP-1 secretion, impacting insulin secretion and glucose metabolism.

Conclusions:

• Bile acid receptors play critical roles in gastrointestinal health and disease.
• Targeting bile acid receptors like TGR5 and FXR offers promising therapeutic strategies for conditions such as diabetes mellitus and primary bile acid diarrhea.
• Further research into bile acid receptor signaling is essential for developing novel treatments.