Browse Items · NEOMED Bibliography Database

Is CYP2C70 the key to new mouse models to understand bile acids in humans?

Tags: 2020, Chiang John Y L, Department of Integrative Medical Sciences, Guo Grace L, Journal of lipid research, NEOMED College of Medicine

Fluorocholesterols, In Contrast To Hydroxycholesterols, Exhibit Interfacial Properties Similar To Cholesterol

We used an automated Langmuir-Pockels surface balance to characterize the air-water interfacial properties of cholesterol (CH) and its derivatives with hydrophilic OH and F substitutions at isologous sites on the sterol body or side chain. We studied…

Cholesterol 7-alpha-hydroxylase - Evidence For Transcriptional Regulation By Cholesterol Or Metabolic Products Of Cholesterol In The Rat

Cholesterol 7alpha-hydroxylase, the rate-determining enzyme in the bile acid biosynthesis pathway, is regulated in a negative feedback manner by hydrophobic bile salts returning to the liver via the portal circulation. The role of cholesterol in the…

Saturated Fatty Acids Activate Erk Signaling To Downregulate Hepatic Sortilin 1 In Obese And Diabetic Mice

Hepatic VLDL overproduction is a characteristic feature of diabetes and an important contributor to diabetic dyslipidemia. Hepatic sortilin 1 (Sort1), a cellular trafficking receptor, is a novel regulator of plasma lipid metabolism and reduces plasma…

Peroxisome Proliferator-activated Receptor Alpha (ppar Alpha) And Agonist Inhibit Cholesterol 7 Alpha-hydroxylase Gene (cyp7a1) Transcription

Saturated Fatty Acids Activate Erk Signaling To Downregulate Hepatic Sortilin 1 In Obese And Diabetic Mice

Transcriptional activation of the cholesterol 7 alpha-hydroxylase gene (CYP7A) by nuclear hormone receptors

The gene encoding cholesterol 7 alpha-hydroxylase (CYP7A), the rate-limiting enzyme in bile acid synthesis, is transcriptionally regulated by bile acids and hormones. Previously, we have identified two bile acid response elements (BARE) in the…

Intestinal CYP3A4 protects against lithocholic acid-induced hepatotoxicity in intestine-specific VDR-deficient mice

Vitamin D receptor (VDR) mediates vitamin D signaling involved in bone metabolism, cellular growth and differentiation, cardiovascular function, and bile acid regulation. Mice with an intestine-specific disruption of VDR (Vdr(Delta IEpC)) have…

Nuclear receptor-mediated repression of human cholesterol 7 alpha-hydroxylase gene transcription by bile acids

Hydrophobic bile acids strongly repressed transcription of the human cholesterol 7 alpha -hydroxylase gene (CYP7A1) in the bile acid biosynthetic pathway in the Ever. Farnesoid X receptor (FXR) repressed CYP7A1/Luc reporter activity in a transfection…

CLOFIBRATE-INDUCIBLE RAT HEPATIC P450S IVA1 AND IVA3 CATALYZE THE OMEGA-HYDROXYLATION AND (OMEGA-1)-HYDROXYLATION OF FATTY-ACIDS AND THE OMEGA-HYDROXYLATION OF PROSTAGLANDINS-E1 AND F2-ALPHA

Tags: 1990, Aoyama T, Biochemistry & Molecular Biology, Funae Y, Gelboin H V, Gonzalez F J, Hardwick J P, Imaoka S, Journal Article or Conference Abstract Publication, Journal of lipid research

Structure and functions of human oxysterol 7 alpha-hydroxylase cDNAs and gene CYP7B1

Oxysterol 7 alpha-hydroxylase has broad substrate specificity for sterol metabolites and may be involved in many metabolic processes including bile acid synthesis and neurosteroid metabolism, The cloned human oxysterol 7 alpha-hydroxylase (CYP7B1)…

Physicochemical characterization of a model digestive mixture by H-2 NMR

H-2 nuclear magnetic resonance (NMR) spectra were obtained at 30.87 MHz for 8% (w/v) aqueous dispersions of mixtures of bile salts (MBS), mixed intestinal lipids (MIL; myristic acid, monomyristoylglycerol dimyristoylphos-phatidylcholine = 5:1:1), and…

HNF4 and COUP-TFII interact to modulate transcription of the cholesterol 7 alpha-hydroxylase gene (CYP7A1)

The gene for cholesterol 7 alpha-hydroxylase (CYP7A1) contains a sequence at nt -149 to -118 that was found to play a large role in determining the overall transcriptional activity and regulation of the promoter. Hepatocyte nuclear factor 4 (HNF4)…

Hormonal regulation of cholesterol 7 alpha-hydroxylase specific activity, mRNA levels, and transcriptional activity in vivo in the rat

In primary cultures of rat hepatocytes, transcription of the cholesterol 7 alpha-hydroxylase gene is induced synergistically by glucocorticoid and thyroid hormones. The objective of the present study was to evaluate the role of glucocorticoid and…

BILE-ACID SYNTHESIS .6. REGULATION OF CHOLESTEROL 7-ALPHA-HYDROXYLASE BY TAUROCHOLATE AND MEVALONATE

Taurocholate, a relatively hydrophobic bile salt, is a potent down-regulator of HMG-CoA reductase and cholesterol 7-alpha-hydroxylase (C7-alpha-H), the rate-determining enzymes of the cholesterol and bile acid biosynthetic pathways, respectively.…

The stimulatory effect of LXR alpha is blocked by SHP despite the presence of a LXR alpha binding site in the rabbit CYP7A1 promoter

The transcription of the cholesterol 7 alpha-hydroxylase gene (CYP7A1) is greatly decreased in cholesterol-fed rabbits. To determine whether the molecular structure of the promoter is responsible for this downregulation, we cloned the rabbit CYP7A1…

Dissociation of diabetes and obesity in mice lacking orphan nuclear receptor small heterodimer partner

Mixed background SHP(-/-) mice are resistant to diet-induced obesity due to increased energy expenditure caused by enhanced PGC-1 alpha expression in brown adipocytes. However, congenic SHP(-/-) mice on the C57BL/6 background showed normal expression…

Structure and functions of human oxysterol 7alpha-hydroxylase cDNAs and gene CYP7B1.

Oxysterol 7alpha-hydroxylase has broad substrate specificity for sterol metabolites and may be involved in many metabolic processes including bile acid synthesis and neurosteroid metabolism. The cloned human oxysterol 7alpha-hydroxylase (CYP7B1) cDNA…

Physicochemical characterization of a model digestive mixture by 2H NMR.

2H nuclear magnetic resonance (NMR) spectra were obtained at 30.87 MHz for 8% (w/v) aqueous dispersions of mixtures of bile salts (MBS), mixed intestinal lipids (MIL; myristic acid, monomyristoylglycerol, dimyristoylphosphatidylcholine = 5:1:1), and…

Tags: 1995, Deuterium, Journal of lipid research, Lipids/*chemistry, Magnetic Resonance Spectroscopy, Radiation, Scattering, Westerman P W

Transcriptional regulation of the human cholesterol 7 alpha-hydroxylase gene (CYP7A) in HepG2 cells.

A stable HepG2 cell line harboring a human cholesterol 7 alpha-hydroxylase (CYP7A) minigene/luciferase reporter gene construct was selected for studying transcriptional regulation of CYP7A gene promoter. Insulin and phorbol

HNF4 and COUP-TFII interact to modulate transcription of the cholesterol 7alpha-hydroxylase gene (CYP7A1).

The gene for cholesterol 7alpha-hydroxylase (CYP7A1) contains a sequence at nt -149 to -118 that was found to play a large role in determining the overall transcriptional activity and regulation of the promoter. Hepatocyte nuclear factor 4 (HNF4) and…

Peroxisome proliferator-activated receptor alpha (PPARalpha) and agonist inhibit cholesterol 7alpha-hydroxylase gene (CYP7A1) transcription.

Fibrates are widely used hypolipidemic drugs that regulate the expression of many genes involved in lipid metabolism by activating the peroxisome proliferator-activated receptor alpha (PPARalpha). The objective of this study was to investigate the…

Tags: *DNA-Binding Proteins, *Regulatory Sequences, 2000, Animals, Anticholesteremic Agents/pharmacology, Basic Helix-Loop-Helix Leucine Zipper Transcription Factors, Binding Sites, Chiang J Y, Cholesterol 7-alpha-Hydroxylase/biosynthesis/*genetics, Clofibric Acid/pharmacology, Cytoplasmic and Nuclear/*agonists, Department of Integrative Medical Sciences, Enzymologic, Gene Expression Regulation, Genes, Genetic, Hepatocyte Nuclear Factor 4, Humans, Journal of lipid research, Liver/metabolism, Marrapodi M, Models, NEOMED College of Medicine, Nucleic Acid, Peroxisome Proliferators/pharmacology, Phosphoproteins/metabolism, Promoter Regions, Protein Binding, Pyrimidines/pharmacology, Rats, Receptors, Reporter, Response Elements, Retinoic Acid/metabolism, Retinoid X Receptors, Species Specificity, Transcription, Transcription Factors/*agonists/metabolism, Transcriptional Activation

Expression and purification of human cholesterol 7 alpha-hydroxylase in Escherichia coli.

Cholesterol 7 alpha-hydroxylase (P450c7) is the first and rate-limiting enzyme in bile acid biosynthesis and is the product of a cytochrome P450 gene, CYP7. We have previously reported the cloning of a full-length human cholesterol 7…

Transcriptional activation of the cholesterol 7alpha-hydroxylase gene (CYP7A) by nuclear hormone receptors.

The gene encoding cholesterol 7alpha-hydroxylase (CYP7A), the rate-limiting enzyme in bile acid synthesis, is transcriptionally regulated by bile acids and hormones. Previously, we have identified two bile acid response elements (BARE) in the…

Tags: *Receptors, *Transcriptional Activation, 1998, Animals, Base Sequence, Bile Acids and Salts/biosynthesis, Chiang J Y, Cholesterol 7-alpha-Hydroxylase/*genetics, COUP Transcription Factor II, COUP Transcription Factors, Crestani M, Cultured, Cytoplasmic and Nuclear/*physiology, Department of Integrative Medical Sciences, DNA-Binding Proteins/metabolism, DNA/metabolism, Galli G, Genes, Genetic, Hepatocyte Nuclear Factor 4, Hormones/*physiology, Journal of lipid research, Luciferases/genetics, Molecular Sequence Data, Mutagenesis, NEOMED College of Medicine, Nucleic Acid, Oligonucleotide Probes/metabolism, Phosphoproteins/metabolism, Promoter Regions, Rats, Receptors, Repetitive Sequences, Reporter, Retinoic Acid/metabolism, Retinoid X Receptors, Sadeghpour A, Site-Directed, Steroid, Stroup D, Transcription Factors/metabolism, Tumor Cells

Hormonal regulation of the cholesterol 7 alpha-hydroxylase gene (CYP7).

The transcriptional regulation of the rat cholesterol 7 alpha-hydroxylase gene (CYP7) by hormones and signal transduction pathways was studied by transient transfection assay of the promoter activity. HepG2 cells were transfected with deletion…

Nuclear receptor-mediated repression of human cholesterol 7alpha-hydroxylase gene transcription by bile acids.

Hydrophobic bile acids strongly repressed transcription of the human cholesterol 7alpha-hydroxylase gene (CYP7A1) in the bile acid biosynthetic pathway in the liver. Farnesoid X receptor (FXR) repressed CYP7A1/Luc reporter activity in a transfection…

Tags: *Hydroxysteroid Dehydrogenases, *Membrane Glycoproteins, 2001, Animals, Bile Acids and Salts/*pharmacology, Caco-2 Cells, Carrier Proteins/genetics/physiology, Cell Line, Chen W, Chiang J Y, CHO Cells, Cholesterol 7-alpha-Hydroxylase/*genetics, Cricetinae, Cultured, Cytoplasmic and Nuclear/genetics/*physiology, Department of Integrative Medical Sciences, DNA-Binding Proteins/drug effects/genetics/physiology, DNA/metabolism, Embryo, Gene Expression/*drug effects, Genetic, Genetic/drug effects, Humans, Journal of lipid research, Kidney, Liver/metabolism, Luciferases/genetics, Mammalian, Messenger/analysis, NEOMED College of Medicine, Owsley E, Promoter Regions, Rats, Receptors, Recombinant Fusion Proteins/metabolism, Retinoic Acid/genetics/physiology, Retinoid X Receptors, Reverse Transcriptase Polymerase Chain Reaction, RNA, Stroup D, Taurocholic Acid/pharmacology, Transcription, Transcription Factors/drug effects/genetics/physiology, Transfection, Tumor Cells, Yang Y

Bile acids: regulation of synthesis.

Bile acids are physiological detergents that generate bile flow and facilitate intestinal absorption and transport of lipids, nutrients, and vitamins. Bile acids also are signaling molecules and inflammatory agents that rapidly activate nuclear…

Tags: 2009, Animals, Bile Acids and Salts/*metabolism, Biological, Chiang John Y L, Cholesterol 7-alpha-Hydroxylase/metabolism, Cytoplasmic and Nuclear/metabolism, Department of Integrative Medical Sciences, Humans, Journal of lipid research, Models, NEOMED College of Medicine, Receptors, Signal Transduction/physiology

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

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…

Cholesteryl ester transfer protein alters liver and plasma triglyceride metabolism through two liver networks in female mice.

Elevated plasma TGs increase risk of cardiovascular disease in women. Estrogen treatment raises plasma TGs in women, but molecular mechanisms remain poorly understood. Here we explore the role of cholesteryl ester transfer protein (CETP) in the…

Cholesterol 7alpha-hydroxylase-deficient mice are protected from high-fat/high-cholesterol diet-induced metabolic disorders.

Cholesterol 7alpha-hydroxylase (CYP7A1) is the first and rate-limiting enzyme in the conversion of cholesterol to bile acids in the liver. In addition to absorption and digestion of nutrients, bile acids play a critical role in the regulation of…

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…

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