Browse Items · NEOMED Bibliography Database

Bile acid-based therapies for non-alcoholic steatohepatitis and alcoholic liver disease.

Bile acids are synthesized from cholesterol only in hepatocytes. Bile acids circulating in the enterohepatic system act as physiological detergent molecules to help solubilize biliary cholesterol and emulsify dietary lipids and fat-soluble vitamins…

Nuclear receptors in bile acid metabolism.

Bile acids are signaling molecules that activate nuclear receptors, such as farnesoid X receptor, pregnane X receptor, constitutive androstane receptor, and vitamin D receptor, and play a critical role in the regulation of lipid, glucose, energy, and…

Tags: 2013, Animals, Bile Acids and Salts/*metabolism, Biological Transport, Chiang John Y L, Cytoplasmic and Nuclear/genetics/*metabolism, Department of Integrative Medical Sciences, Drug metabolism reviews, Humans, Inactivation, Li Tiangang, Metabolic, NEOMED College of Medicine, Receptors, Xenobiotics/metabolism/pharmacology

A novel bile acid-activated vitamin D receptor signaling in human hepatocytes.

Vitamin D receptor (VDR) is activated by natural ligands, 1alpha,

Tags: 2010, Calcitriol/*metabolism, Calcitriol/pharmacology, Cell Membrane/drug effects/metabolism, Cell Nucleus/drug effects/metabolism, Chiang John Y L, Cholesterol 7-alpha-Hydroxylase/antagonists & inhibitors/genetics, Department of Integrative Medical Sciences, Ellis Ewa, Enzyme Activation/drug effects, Extracellular Signal-Regulated MAP Kinases/antagonists & inhibitors, Genetic/genetics, Han Shuxin, Hep G2 Cells, Hepatocyte Nuclear Factor 4/metabolism, Hepatocytes/*drug effects/enzymology/*metabolism, Humans, Intracellular Space/drug effects/metabolism, Li Tiangang, Ligands, Lithocholic Acid/*pharmacology, Mitogen-Activated Protein Kinase Kinases/metabolism, Molecular endocrinology (Baltimore, Md.), NEOMED College of Medicine, Phosphorylation/drug effects, Phosphotyrosine/metabolism, Promoter Regions, Protein Kinase Inhibitors/pharmacology, Protein Transport/drug effects, Proto-Oncogene Proteins c-raf/metabolism, Receptors, Retinoid X Receptor alpha/metabolism, Signal Transduction/*drug effects, src-Family Kinases/metabolism, Steroid Hydroxylases/genetics/metabolism, Strom Stephen, Vitamin D3 24-Hydroxylase

TGFbeta1, TNFalpha, and insulin signaling crosstalk in regulation of the rat cholesterol 7alpha-hydroxylase gene expression.

The TGFbeta1/Smad pathway plays a critical role in cholestasis and liver fibrosis. Previous studies show that TGFbeta1, TNFalpha, and insulin inhibit cholesterol 7alpha-hydroxylase (CYP7A1) gene transcription and bile acid synthesis in human…

PXR induces CYP27A1 and regulates cholesterol metabolism in the intestine.

Mitochondrial sterol 27-hydroxylase (CYP27A1) catalyzes oxidative cleavage of the sterol side chain in the bile acid biosynthetic pathway in the liver and

Tags: *Lipid Metabolism, 2007, ATP Binding Cassette Transporter, ATP Binding Cassette Transporter 1, ATP-Binding Cassette Transporters/genetics, Base Sequence, Cell Line, Chen Wenling, Chiang John Y L, Cholestanetriol 26-Monooxygenase/*metabolism, Cholesterol, Cholesterol/*metabolism, Department of Integrative Medical Sciences, Fluorinated, Genes, Genetic/drug effects, Genetic/genetics, HDL/metabolism, Hepatocytes/drug effects/enzymology/metabolism, Humans, Hydrocarbons, Hydroxycholesterols/metabolism/pharmacology, Intestinal Mucosa/metabolism, Intestines/cytology/drug effects/enzymology, Journal of lipid research, Li Tiangang, Member 1, Messenger/genetics/metabolism, Molecular Sequence Data, NEOMED College of Medicine, Pregnane X Receptor, Promoter Regions, Receptors, Reporter, Response Elements/genetics, Rifampin/pharmacology, RNA, Steroid/*metabolism, Subfamily G, Sulfonamides/pharmacology, Transcription, Up-Regulation/drug effects

Aldo-keto reductase 1B7 is a target gene of FXR and regulates lipid and glucose homeostasis.

Aldo-keto reductase 1B7 (AKR1B7) is proposed to play a role in detoxification of by-products of lipid peroxidation. In this article, we show that activation of the nuclear receptor farnesoid X receptor (FXR) induces AKR1B7 expression in the liver and…

A putative role of micro RNA in regulation of cholesterol 7alpha-hydroxylase expression in human hepatocytes.

Cholesterol 7alpha-hydroxylase (CYP7A1) plays a critical role in regulation of bile acid synthesis in the liver. CYP7A1 mRNAs have very short half-lives, and bile acids destabilize CYP7A1 mRNA via the 3'-untranslated region (3'-UTR). However, the…

Glucose stimulates cholesterol 7alpha-hydroxylase gene transcription in human hepatocytes.

Bile acids play important roles in the regulation of lipid, glucose, and energy homeostasis. Recent studies suggest that glucose regulates gene transcription in the liver. The aim of this study was to investigate the potential role of glucose in…

Bile Acid signaling in liver metabolism and diseases.

Obesity, diabetes, and metabolic syndromes are increasingly recognized as health concerns worldwide. Overnutrition and insulin resistance are the major causes of diabetic hyperglycemia and hyperlipidemia in humans. Studies in the past decade provide…

Tags: 2012, Chiang John Y L, Department of Integrative Medical Sciences, Journal of lipids, Li Tiangang, NEOMED College of Medicine

Regulation of bile acid and cholesterol metabolism by PPARs.

Bile acids are amphipathic molecules synthesized from cholesterol in the liver. Bile acid synthesis is a major pathway for hepatic cholesterol catabolism. Bile acid synthesis generates bile flow which is important for biliary secretion of free…

Tags: 2009, Chiang John Y L, Department of Integrative Medical Sciences, Li Tiangang, NEOMED College of Medicine, PPAR research

Mechanism of rifampicin and pregnane X receptor inhibition of human cholesterol 7 alpha-hydroxylase gene transcription.

Bile acids, steroids, and drugs activate steroid and xenobiotic receptor pregnane X receptor (PXR; NR1I2), which induces human cytochrome P4503A4 (CYP3A4) in drug metabolism and cholesterol 7 alpha-hydroxylase (CYP7A1) in bile acid synthesis in the…

Bile acid signaling in metabolic disease and drug therapy.

Bile acids are the end products of cholesterol catabolism. Hepatic bile acid synthesis accounts for a major fraction of daily cholesterol turnover in humans. Biliary secretion of bile acids generates bile flow and facilitates hepatobiliary secretion…

Rifampicin induction of CYP3A4 requires pregnane X receptor cross talk with hepatocyte nuclear factor 4alpha and coactivators, and suppression of small heterodimer partner gene expression.

Bile acids and drugs activate pregnane X receptor (PXR) to induce CYP3A4, which is the predominant cytochrome P450 enzyme expressed in the liver and intestine and plays a critical role in detoxifying bile acids and drugs, and protecting against…

Tags: 2006, Antibiotics, Antitubercular/*pharmacology, Blotting, Cell Line, Chiang John Y L, Chromatin/metabolism, Cytochrome P-450 CYP3A, Cytochrome P-450 Enzyme System/*biosynthesis, Cytoplasmic and Nuclear/*biosynthesis/*drug effects/genetics, Department of Integrative Medical Sciences, Drug metabolism and disposition: the biological fate of chemicals, Electrophoretic Mobility Shift Assay, Enzyme Induction/drug effects, Glutathione Transferase/metabolism, Hepatocyte Nuclear Factor 4/genetics/*metabolism, Hepatocytes/drug effects/metabolism, Humans, Immunoprecipitation, Li Tiangang, Messenger/biosynthesis, NEOMED College of Medicine, Plasmids/genetics, Pregnane X Receptor, Receptor Cross-Talk/drug effects, Receptors, Reverse Transcriptase Polymerase Chain Reaction, Rifampin/*pharmacology, RNA, Steroid/*drug effects/genetics, Transfection, Tumor, Western

Bile acids as metabolic regulators.

PURPOSE OF REVIEW: This review focuses on the latest understanding of the molecular mechanisms underlying the complex interactions between intestine and liver bile acid signaling, gut microbiota, and their impact on whole-body lipid, glucose and…

Insulin regulation of cholesterol 7alpha-hydroxylase expression in human hepatocytes: roles of forkhead box O1 and sterol regulatory element-binding protein 1c.

Bile acid synthesis and pool size increases in diabetes, whereas insulin inhibits bile acid synthesis. The objective of this study is to elucidate the mechanism of insulin regulation of cholesterol 7alpha-hydroxylase gene expression in human…

A Prospero-related homeodomain protein is a novel co-regulator of hepatocyte nuclear factor 4alpha that regulates the cholesterol 7alpha-hydroxylase gene.

Prox1, an early specific marker for developing liver and pancreas in foregut endoderm has recently been shown to interact with alpha-fetoprotein transcription factor and repress cholesterol 7alpha-hydroxylase (CYP7A1) gene transcription. Using a…

Tags: *Gene Expression Regulation, 2006, Aged, Amino Acid Motifs, Bile Acids and Salts/metabolism, Cell Line, Cell Nucleus/metabolism, Cells, Chiang John Y L, Cholesterol 7-alpha-Hydroxylase/*chemistry/*genetics, Cultured/metabolism, Department of Integrative Medical Sciences, Enzymologic, Female, Genes, Genetic, Gluconeogenesis, Glutathione Transferase/metabolism, Hepatocyte Nuclear Factor 4/metabolism/*physiology, Hepatocytes/metabolism, Homeodomain Proteins/metabolism/*physiology, Humans, Immunoprecipitation, Li Tiangang, Liver/metabolism, Luciferases/metabolism, Male, Messenger/metabolism, Middle Aged, NEOMED College of Medicine, Phosphoenolpyruvate Carboxykinase (ATP)/metabolism, Plasmids/metabolism, Protein Structure, Reporter, Response Elements, Reverse Transcriptase Polymerase Chain Reaction, RNA, Small Interfering/metabolism, Song Kwang-Hoon, Tertiary, The Journal of biological chemistry, Time Factors, Transcription, Transcriptional Activation, Transfection, Tumor Suppressor Proteins, Two-Hybrid System Techniques

Retinoic acid-related orphan receptor alpha regulates diurnal rhythm and fasting induction of sterol 12alpha-hydroxylase in bile acid synthesis.

Sterol 12alpha-hydroxylase (CYP8B1) is required for cholic acid synthesis and plays a critical role in intestinal cholesterol absorption and pathogenesis of cholesterol gallstone, dyslipidemia, and diabetes. In this study we investigated the…

Glucose and insulin induction of bile acid synthesis: mechanisms and implication in diabetes and obesity.

Bile acids facilitate postprandial absorption of nutrients. Bile acids also activate the farnesoid X receptor (FXR) and the G protein-coupled receptor TGR5 and play a major role in regulating lipid, glucose, and energy metabolism. Transgenic…

A novel role of transforming growth factor beta1 in transcriptional repression of human cholesterol 7alpha-hydroxylase gene.

BACKGROUND & AIMS: Inhibition of cholesterol 7alpha-hydroxylase (CYP7A1) by bile acids and inflammatory cytokines provides an important mechanism to protect hepatocytes from bile acid toxicity during cholestasis. Transforming growth factor beta1…

Targeting the Enterohepatic Bile Acid Signaling Induces Hepatic Autophagy via a

BACKGROUND & AIMS: Hepatic cholesterol accumulation and autophagy defects contribute to hepatocyte injury in fatty liver disease. Bile acid synthesis is a major pathway for cholesterol catabolism in the liver. This study aims to understand the…

Tags: 2017, 4EBP-1, ACAT, acyl-CoA:cholesterol acyltransferase, CE, Cellular and molecular gastroenterology and hepatology, Chavan Hemantkumar, Chiang John Y L, chloroquine, Cholesterol, cholesterol 7alpha-hydroxylase, cholesterol ester, Cholestyramine, ChTM, CQ, CYP7A1, Department of Integrative Medical Sciences, diet-induced obesity, Ding Wen-Xing, Ding Yifeng, DIO, endoplasmic reticulum, ER, eukaryotic translation initiation factor 4E-binding protein 1, Fatty Liver, FC, free cholesterol, glycogen synthase kinase 3beta, GSK3beta, HMG-CoA reductase, HMGCR, Krishnamurthy Partha, LC3, LDLR, Li Jibiao, Li Tiangang, LMP, low-density lipoprotein receptor, lysosome membrane permeabilization, Matye David, messenger RNA, microtubule-associated protein 1A/1B-light chain 3, mRNA, mTOR, NEOMED College of Medicine, Ni Hong-Min, Nuclear Receptor, phosphatidylinositol, PI, plasma membrane, PM, S6, SREBP, sterol response element binding protein, the nutrient sensing mechanistic target of rapamycin, tibosomal protein S6, Wang Yifeng

Bile acid signaling in lipid metabolism: metabolomic and lipidomic analysis of lipid and bile acid markers linked to anti-obesity and anti-diabetes in mice.

Bile acid synthesis is the major pathway for catabolism of cholesterol. Cholesterol 7alpha-hydroxylase (CYP7A1) is the rate-limiting enzyme in the bile acid biosynthetic pathway in the liver and plays an important role in regulating lipid, glucose…

Tags: 2015, Animals, Bile acid metabolism, Bile Acids and Salts/genetics/*metabolism, Biochimica et biophysica acta, Cheng Jie, Chiang John Y L, Cholesterol 7-alpha-Hydroxylase/genetics/metabolism, CYP7A1, Department of Integrative Medical Sciences, Diabetes Mellitus/genetics/*metabolism, Diet, farnesoid X receptor (FXR), Female, Ferrell Jessica M, Glucose/genetics/metabolism, Gonzalez Frank J, High-Fat/methods, Homeostasis, Inbred C57BL, Insulin Resistance, Intestinal Mucosa/metabolism, Jiang Changtao, Krausz Kristopher W, Li Tiangang, Lipid Metabolism/*physiology, lipidomics, Liver/metabolism, Male, Metabolome/*genetics, Metabolomics/methods, Mice, NEOMED College of Medicine, Obesity/genetics/*metabolism, Qi Yunpeng, Rats, Signal Transduction, tauro-beta-muricholic acid, Taurocholic Acid/analogs & derivatives/genetics/metabolism, Transgenic

Forkhead box transcription factor O1 inhibits cholesterol 7alpha-hydroxylase in human hepatocytes and in high fat diet-fed mice.

The conversion of cholesterol to bile acids is the major pathway for cholesterol catabolism. Bile acids are metabolic regulators of triglycerides and glucose metabolism in the liver. This study investigated the roles of FoxO1 in the regulation of…

Tags: 2009, Adenoviridae/genetics, Animals, Bile Acids and Salts/biosynthesis, Biochimica et biophysica acta, Cell Line, Cell Nucleus/drug effects/metabolism, Chiang John Y L, Cholesterol 7-alpha-Hydroxylase/*antagonists & inhibitors/genetics/metabolism, Department of Integrative Medical Sciences, Dietary Fats/*administration & dosage/*pharmacology, Down-Regulation/drug effects, Enzymologic/drug effects, Feeding Behavior/*drug effects, Forkhead Box Protein O1, Forkhead Transcription Factors/genetics/*metabolism, Gene Expression Regulation, Gene Knockdown Techniques, Gene Transfer Techniques, Hepatocytes/drug effects/*enzymology, Humans, Inbred C57BL, Insulin Resistance, Insulin/metabolism, Lee Yoon-Kwang, Li Tiangang, Ma Huiyan, Male, Messenger/genetics/metabolism, Mice, Moore David D, NEOMED College of Medicine, Park Young Joo, RNA, RNA Interference/drug effects, Strom Stephen, Tumor

All-trans-retinoic acid ameliorates hepatic steatosis in mice by a novel transcriptional cascade.

UNLABELLED: Mice deficient in small heterodimer partner (SHP) are protected from diet-induced hepatic steatosis resulting from increased fatty acid oxidation and decreased lipogenesis. The decreased lipogenesis appears to be a direct consequence of…

Regulation of cholesterol and bile acid homeostasis by the cholesterol 7alpha-hydroxylase/steroid response element-binding protein 2/microRNA-33a axis in mice.

UNLABELLED: Bile acid synthesis not only produces physiological detergents required for intestinal nutrient absorption, but also plays a critical role in regulating hepatic and whole-body metabolic homeostasis. We recently reported that…

Overexpression of cholesterol 7alpha-hydroxylase promotes hepatic bile acid synthesis and secretion and maintains cholesterol homeostasis.

UNLABELLED: We reported previously that mice overexpressing cytochrome P450 7a1 (Cyp7a1; Cyp7a1-tg mice) are protected against high fat diet-induced hypercholesterolemia, obesity, and insulin resistance. Here, we investigated the underlying mechanism…

Transgenic expression of cholesterol 7alpha-hydroxylase in the liver prevents high-fat diet-induced obesity and insulin resistance in mice.

UNLABELLED: Cholesterol 7alpha-hydroxylase (CYP7A1) is the rate-limiting enzyme in the bile acid biosynthetic pathway that converts cholesterol into bile acids in the liver. Recent studies have shown that bile acids may play an important role in…

Bile acids activate fibroblast growth factor 19 signaling in human hepatocytes to inhibit cholesterol 7alpha-hydroxylase gene expression.

UNLABELLED: Mouse fibroblast growth factor 15 (FGF15) and human ortholog FGF19 have been identified as the bile acid-induced intestinal factors that mediate bile acid feedback inhibition of cholesterol 7alpha-hydroxylase gene (C YP7A1) transcription…

Tags: 2009, Butadienes/pharmacology, Carcinoma, Cell Line, Chenodeoxycholic Acid/*pharmacology, Chiang John Y L, Cholesterol 7-alpha-Hydroxylase/*biosynthesis, Cytoplasmic and Nuclear/metabolism/physiology, Department of Integrative Medical Sciences, DNA-Binding Proteins/metabolism, Fibroblast Growth Factor, Fibroblast Growth Factors/drug effects/*physiology, Gene Expression/drug effects, Hepatocellular/metabolism, Hepatocytes/metabolism, Hepatology (Baltimore, Md.), Humans, Isoxazoles/pharmacology, Li Tiangang, Mitogen-Activated Protein Kinase 1/metabolism, Mitogen-Activated Protein Kinase 3/metabolism, NEOMED College of Medicine, Nitriles/pharmacology, Owsley Erika, Receptor, Receptors, Signal Transduction/drug effects, Song Kwang-Hoon, Strom Stephen, Transcription Factors/metabolism, Tumor, Type 4/antagonists & inhibitors

Bile acids and cytokines inhibit the human cholesterol 7 alpha-hydroxylase gene via the JNK/c-jun pathway in human liver cells.

Cholesterol 7 alpha-hydroxylase (CYP7A1) of the bile acid biosynthesis pathway is suppressed by bile acids and inflammatory cytokines. Bile acids are known to induce inflammatory cytokines to activate the mitogen-activated protein kinase/c-Jun…

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