Leptin Influence Cholelithiasis Formation by Regulating Bile Acid Metabolism

Area of Science:

• Hepatology
• Metabolic research
• Gastroenterology

Background:

• Bile acid metabolism is implicated in cholelithiasis.
• Leptin's role in gallbladder stone (GS) formation is suggested, but its involvement in primary intrahepatic bile duct stones (PIBDS) is unconfirmed.
• This study investigates leptin's function in PIBDS formation.

Purpose of the Study:

• To investigate the role of leptin in the formation of gallbladder stones (GS) and primary intrahepatic bile duct stones (PIBDS).
• To elucidate the underlying molecular mechanisms involving bile acid metabolism and specific signaling pathways.

Main Methods:

• Analysis of liver tissue from patients with GS and PIBDS for BSEP expression.
• In vitro study using L02 cells stimulated with leptin to assess OB-Rb, AMPKα2, and BSEP expression via q-PCR, Western blot, and immunohistochemistry.
• Pharmacological inhibition using Compound C to confirm pathway involvement.

Main Results:

• Serum leptin levels were elevated in the GS group compared to control and PIBDS groups.
• Expression of OB-Rb, p-AMPKα2, and BSEP was significantly decreased in GS and PIBDS groups versus controls.
• Leptin stimulation in vitro increased OB-Rb, p-AMPKα2, and BSEP protein levels in L02 cells, an effect reversed by Compound C.

Conclusions:

• Cholelithiasis, particularly PIBDS, is associated with leptin.
• Leptin regulates bile acid metabolism through the OB-Rb/AMPKα2/BSEP signaling pathway.
• This pathway represents a potential therapeutic target for treating leptin-associated gallstone diseases.