Browse Items · NEOMED Bibliography Database

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

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…

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…

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 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…

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…

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

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

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

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…

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…

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…

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…

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…

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…

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

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…

Cholesterol 7alpha-hydroxylase protects the liver from inflammation and fibrosis by maintaining cholesterol homeostasis.

Cholesterol 7alpha-hydroxylase (CYP7A1) plays a critical role in control of bile acid and cholesterol homeostasis. Bile acids activate farnesoid X receptor (FXR) and Takeda G protein-coupled receptor 5 (TGR5) to regulate lipid, glucose, and energy…

Transcriptional regulation of human oxysterol 7alpha-hydroxylase by sterol response element binding protein.

Oxysterol 7alpha-hydroxylase (CYP7B1) metabolizes oxysterols, potent regulators of lipid homeostasis. Very little is known about transcriptional regulation of human CYP7B1. The present results indicate that sterol response element binding protein…

Guggulsterone antagonizes farnesoid X receptor induction of bile salt export pump but activates pregnane X receptor to inhibit cholesterol 7alpha-hydroxylase gene.

Bile acids activate a nuclear receptor, farnesoid X receptor (FXR), that induces bile salt export pump (BSEP) but inhibits cholesterol 7alpha-hydroxylase (CYP7A1) gene transcription in the liver. Guggulsterone, a plant sterol that lowers serum…

Sterol 12alpha-hydroxylase Aggravates Dyslipidemia by Activating the Ceramide/mTORC1/SREBP1C Pathway via FGF21 and FGF15.

Sterol 12alpha-hydroxylase (CYP8B1) is required for synthesis of cholic acid in the classic bile acid synthesis pathway and plays a role in dyslipidemia and insulin resistance. However, the mechanism of the involvement of Cyp8b1 in dyslipidemia and…

Tags: 2019, Chiang John Y L, Department of Integrative Medical Sciences, Gene Expression, NEOMED College of Medicine, Pathak Preeti

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…

Farnesoid X receptor induces Takeda G-protein receptor 5 cross-talk to regulate bile acid synthesis and hepatic metabolism.

The bile acid-activated receptors, nuclear farnesoid X receptor (FXR) and the membrane Takeda G-protein receptor 5 (TGR5), are known to improve glucose and insulin sensitivity in obese and diabetic mice. However, the metabolic roles of these two…

Intestine farnesoid X receptor agonist and the gut microbiota activate G-protein bile acid receptor-1 signaling to improve metabolism.

Bile acids activate farnesoid X receptor (FXR) and G protein-coupled bile acid receptor-1 (aka Takeda G protein-coupled receptor-5 [TGR5]) to regulate bile acid metabolism and glucose and insulin sensitivity. FXR and TGR5 are coexpressed in the…

Tags: 2018, Boehme Shannon, Chiang John Y L, Department of Integrative Medical Sciences, Ferrell Jessica M, Gonzalez Frank J, Hepatology (Baltimore, Md.), Krausz Kristopher W, NEOMED College of Medicine, Nichols Robert G, Pathak Preeti, Patterson Andrew D, Xie Cen

Intestine farnesoid X receptor agonist and the gut microbiota activate G-protein bile acid receptor-1 signaling to improve metabolism.

Bile acids activate farnesoid X receptor (FXR) and G protein-coupled bile acid receptor-1 (aka Takeda G protein-coupled receptor-5 [TGR5]) to regulate bile acid metabolism and glucose and insulin sensitivity. FXR and TGR5 are coexpressed in the…

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

Glucagon and cAMP inhibit cholesterol 7alpha-hydroxylase (CYP7A1) gene expression in human hepatocytes: discordant regulation of bile acid synthesis and gluconeogenesis.

The gene encoding cholesterol 7alpha-hydroxylase (CYP7A1) is tightly regulated to control bile acid synthesis and maintain lipid homeostasis. Recent studies in mice suggest that bile acid synthesis is regulated by the fasted-to-fed cycle, and fasting…

Hepatocyte growth factor signaling pathway inhibits cholesterol 7alpha-hydroxylase and bile acid synthesis in human hepatocytes.

UNLABELLED: Bile acid synthesis in the liver is regulated by the rate-limiting enzyme cholesterol 7alpha-hydroxylase (CYP7A1). Transcription of the CYP7A1 gene is inhibited by bile acids and cytokines. The rate of bile acid synthesis is reduced…

Tags: 2007, Bile Acids and Salts/*biosynthesis, Cells, Chiang John Y L, Cholesterol 7-alpha-Hydroxylase/*biosynthesis, Cultured, Department of Integrative Medical Sciences, Ellis Ewa, Hepatocyte Growth Factor/*metabolism, Hepatocytes/*metabolism, Hepatology (Baltimore, Md.), Humans, NEOMED College of Medicine, Signal Transduction, Song Kwang-Hoon, Strom Stephen

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

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…

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

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

On the mechanism of bile acid inhibition of rat sterol 12alpha-hydroxylase gene (CYP8B1) transcription: roles of alpha-fetoprotein transcription factor and hepatocyte nuclear factor 4alpha.

The sterol 12alpha-hydroxylase (CYP8B1) is a key enzyme of the bile acid biosynthetic pathway. It regulates the composition of bile acids in bile, i.e. ratio between cholic acid (CA) and chenodeoxycholic acid (CDCA). In similarity with cholesterol…

Orphan nuclear receptor oestrogen-related receptor gamma (ERRgamma) plays a key role in hepatic cannabinoid receptor type 1-mediated induction of CYP7A1 gene expression.

Bile acids are primarily synthesized from cholesterol in the liver and have important roles in dietary lipid absorption and cholesterol homoeostasis. Detailed roles of the orphan nuclear receptors regulating cholesterol 7alpha-hydroxylase (CYP7A1),…

Tags: 2015, Animals, bile acid, Bile Acids and Salts/metabolism, Cannabinoid, cannabinoid receptors, CB1/agonists/genetics/*metabolism, Cells, Chiang John Y L, Choi Hueng-Sik, Cholesterol 7-alpha-Hydroxylase/*biosynthesis/genetics, cholesterol 7alpha-hydroxylase (CYP7A1), Cultured, Cytoplasmic and Nuclear/metabolism, Department of Integrative Medical Sciences, Drug Inverse Agonism, Estrogen/genetics/*metabolism, Ethanol/pharmacology, Gene Expression, Genetic, Glycerides/pharmacology, GSK5182, HEK293 Cells, Hepatocytes/metabolism, Humans, Inbred C57BL, Jeong Won-Il, Kim Don-Kyu, Kim Seong Heon, Knockout, Lee Chul-Ho, Lee In-Kyu, Lee Ji-Min, Liver/*metabolism, Mice, NEOMED College of Medicine, oestrogen-related receptor gamma (ERRgamma), orphan nuclear receptor, Park Seung Bum, Promoter Regions, Rats, Receptor, Receptors, small heterodimer partner (SHP), Sprague-Dawley, The Biochemical journal, Transcription, Zhang Yaochen

Browse Items (75 total)