obeticholic-acid and Chemical-and-Drug-Induced-Liver-Injury

This study was designed to investigate the potential role of farnesoid X receptor (FXR) in abnormal bile acid metabolism and pyroptosis during the pathogenesis of triptolide (TP)/lipopolysaccharide (LPS)-induced hepatotoxicity. Moreover, the protective effect of obeticholic acid (OCA) was explored under this condition. In vivo, female C57BL/6 mice were administrated with OCA (40 mg/kg bw, intragastrical injection) before (500 μg/kg bw, intragastrical injection)/LPS (0.1 mg/kg bw, intraperitoneal injection) administration. In vitro, AML12 cells were treated with TP (50 nM) and TNF-α (50 ng/ml) to induce hepatotoxicity; GW4064 (5 μM) and cholestyramine (CHO) (0.1 mg/ml and 0.05 mg/ml) were introduced to explain the role of FXR/total bile acid (TBA) in it. Serum TBA level was significantly elevated, which was induced by FXR suppression. And both GW4064 and CHO intervention presented remarkable protective effects against TP/TNF-α-induced NLRP3 upregulation and pyroptosis pathway activation. Pre-administration of FXR agonist OCA successfully attenuated TP/LPS-induced severe liver injury by reducing serum bile acids accumulation and inhibiting the activation of caspase-11-GSDMD (gasdermin D) pyroptosis pathway. We have drawn conclusions that TP aggravated liver hypersensitivity to LPS and inhibited FXR-SHP (small heterodimer partner) axis, which was served as endogenous signals to activate caspase-11-GSDMD-mediated pyroptosis contributing to liver injury. OCA alleviated TP/LPS-induced liver injury accompanied by inhibiting caspase-11-GSDMD-mediated pyroptosis pathway and decreased serum TBA level. The results indicated that FXR might be an attractive therapeutic target for TP/LPS-induced hepatotoxicity, providing an effective strategy for drug-induced liver injury.

Topics: Animals; Bile Acids and Salts; Caspases; Chemical and Drug Induced Liver Injury; Female; Lipopolysaccharides; Mice; Mice, Inbred C57BL; Pyroptosis; Tumor Necrosis Factor-alpha

Farnesoid X receptor (FXR) plays a key role in bile acid homeostasis, inflammation, fibrosis, and metabolism of lipid and glucose and becomes a promising therapeutic target for nonalcoholic steatohepatitis (NASH) or other FXR-dependent diseases. The phase III trial results of obeticholic acid demonstrate that the FXR agonists emerge as a promising intervention in patients with NASH and fibrosis, but this bile acid-derived FXR agonist brings severe pruritus and an elevated risk of cardiovascular disease for patients. Herein, we reported our efforts in the discovery of a series of non-bile acid FXR agonists, and 36 compounds were designed and synthesized based on the structure-based drug design and structural optimization strategies. Particularly, compound

Topics: Animals; Binding Sites; Chemical and Drug Induced Liver Injury; Chenodeoxycholic Acid; Drug Design; Drug Evaluation, Preclinical; Half-Life; Humans; Liver; Male; Mice; Mice, Inbred C57BL; Molecular Docking Simulation; Non-alcoholic Fatty Liver Disease; Rats; Rats, Sprague-Dawley; Receptors, Cytoplasmic and Nuclear; Structure-Activity Relationship

Topics: Aged; Chemical and Drug Induced Liver Injury; Chenodeoxycholic Acid; Female; Humans; Liver Cirrhosis, Biliary; Male; Middle Aged

Topics: Antiviral Agents; Blood Coagulation Disorders; Chemical and Drug Induced Liver Injury; Chenodeoxycholic Acid; End Stage Liver Disease; Gastroenterology; Hepatic Encephalopathy; Hepatitis C, Chronic; Humans; Liver Cirrhosis; Liver Cirrhosis, Biliary; Liver Diseases; Non-alcoholic Fatty Liver Disease; Palliative Care

Topics: Chemical and Drug Induced Liver Injury; Chenodeoxycholic Acid; Cholangitis; Dose-Response Relationship, Drug; Gastrointestinal Agents; Humans; United States; United States Food and Drug Administration

Cholestasis, as a main manifestation, induces liver injury during sepsis. The farnesoid X receptor (FXR) plays an important role in regulating bile acid homeostasis. Whether FXR activation by its agonist obeticholic acid (OCA) is contributed to improve sepsis-induced liver injury remains unknown.. The aim of the present study was to investigate the effect of OCA on lipopolysaccharide (LPS)-induced acute liver injury in mice.. 8-week old male C57BL/6J mice were randomly divided into control group, LPS group, oral OCA group and LPS plus oral OCA (LPS + OCA) group. The serum and livers were collected for further analysis. Serum levels of alanine aminotransferase (ALT), aspartate aminotransferase (AST), total bile acid (TBA) and total bilirubin (TBIL) were measured at indicated time after LPS administration. Liver sections were stained with hematoxylin & eosin (H&E). Orally OCA pretreatment stimulated the expression of FXR and BSEP in livers and protected mice from LPS-induced hepatocyte apoptosis and inflammatory infiltration. Consistently, LPS-induced higher serum levels of ALT, AST, TBA and TBIL were significantly reversed by OCA administration. Meanwhile, the mRNA levels of interleukin 1β (IL-1β), tumor necrosis factor α (TNF-α) and IL-6 were decreased in livers of mice in LPS + OCA group compared with LPS group. Further investigation indicated that the higher expression of ATF4 and LC3II/I were associated with the protective effect of OCA on LPS-induced liver injury.. Orally OCA pretreatment protects mice from LPS-induced liver injury possibly contributed by improved bile acid homeostasis, decreased inflammatory factors and ATF4-mediated autophagy activity in hepatocytes.

Topics: Alanine Transaminase; Animals; Apoptosis; Aspartate Aminotransferases; Bile Acids and Salts; Chemical and Drug Induced Liver Injury; Chenodeoxycholic Acid; Cholestasis; Hepatocytes; Inflammation; Lipopolysaccharides; Liver; Male; Mice; Mice, Inbred C57BL; Protective Agents; Receptors, Cytoplasmic and Nuclear