Download or read book Transcriptional Regulation of Human Sterol 27 hydroxylase Gene CYP27A1 written by Wenling Chen and published by . This book was released on 2002 with total page 446 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Pregnane X Receptor Regulation of Bile Acid Metabolism and Cholesterol Homeostasis written by Tiangang Li and published by . This book was released on 2006 with total page 189 pages. Available in PDF, EPUB and Kindle. Book excerpt: The nuclear receptor pregnane X receptor (PXR) is activated by bile acids, steroids and drugs and regulates a network of genes in lipid and drug mechanisms. The goal of this study is to investigate the role of PXR in the coordinate regulation of bile acid synthetic and detoxification genes and its implications in cholestatic liver diseases and treatments. Cholesterol 7alpha hydroxylase (CYP7A1) catalyzes the rate-limiting step in the classic bile acids synthetic pathway and plays a key role in controlling bile acids homeostasis. Quantitative real-time PCR (Q-PCR) showed human PXR agonist rifampicin inhibited CYP7A1 mRNA expression in primary human hepatocytes. Mammalian two-hybrid assays, co-immunoprecipitation (co-IP) assays and chromatin immunoprecipitation (ChIP) assay revealed that ligand-activated PXR strongly interacted with HNF4alpha, the key activator of human CYP7A1, and blocked HNF4alpha interaction with co-activator PGC-1alpha, thus resulted in inhibition of CYP7A1. CYP3A4 is the most abundant cytochrome P450 monooxygenase expressed in human liver and intestine. Bile acids and drugs-activated PXR induces CYP3A4, which converts toxic bile acids to non-toxic metabolites for excretion. Studies using Q-PCR, reporter assays, GST pull-down assays and ChIP assays revealed that PXR strongly induced CYP3A4 gene transcription by interacting with HNF4alpha, SRC-1 and PGC-1alpha. SHP, a negative nuclear receptor, reduced PXR recruitment of HNF4alpha and SRC-1 to the CYP3A4 chromatin and inhibited CYP3A4. Interestingly, PXR concomitantly inhibited SHP gene transcription and maximized the PXR induction of CYP3A4. Taken together, PXR inhibits CYP7A1 to reduce bile acid synthesis and induces CYP3A4 to detoxify bile acid. Thus, PXR may play a protective role against cholestasis. Drugs targeted to PXR may be developed for treating cholestatic liver diseases induced by bile acids and drugs. Mitochondrial sterol 27-hydroxylase (CYP27A1) catalyzes the side-chain cleavage reaction in bile acid synthetic pathways and 27-hydroxylation of cholesterol mainly in the peripheral tissues. Q-PCR revealed that rifampicin induced CYP27A1 mRNA expression in the intestine-derived Caco2 cells, but not in primary human hepatocytes and HepG2 cells. Rifampicin stimulated CYP27A1 gene transcription in cholesterol laden Caco2 cells and increased intracellular 27HOC, which stimulates cholesterol efflux by induction of cholesterol efflux transporters ABCA1 and ABCG1. Mutagenesis analysis, electrophoretic mobility shift assay and ChIP assays identified a functional PXR binding site in the human CYP27A1 gene. These data suggest that 27-hydroxycholesterol is an endogenous LXRalpha ligand and the PXR/CYP27A1/LXRalpha signaling pathway regulate cholesterol efflux in intestine cells. Results revealed an intestine-specific regulation of human CYP27A1 gene by PXR and suggested a novel role for PXR in cholesterol metabolism and detoxification in the intestine.
Download or read book Cholesterol and Oxysterols as Signal Molecules in Human Pathophysiology and Cancer Implications for New Therapeutic Strategies written by Vincenzo Pezzi and published by Frontiers Media SA. This book was released on 2020-01-13 with total page 121 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Cytochrome P450 Function and Pharmacological Roles in Inflammation and Cancer written by and published by Academic Press. This book was released on 2015-07-23 with total page 506 pages. Available in PDF, EPUB and Kindle. Book excerpt: Cytochrome P450 Function and Pharmacological Roles in Inflammation and Cancer, the latest volume in the Advances in Pharmacology series, presents not only the function of cytochrome P450 but also its pharmacological roles in inflammation and cancer. - Contains contributions from the best authors in the field - Ideal reference for those conducting research in cancer, inflammation, cytochrome P450, metabolism, liver disease, and oxidative stress - Provides an essential resource for pharmacologists, immunologists, and biochemists
Download or read book Nuclear Receptors in Drug Metabolism written by Wen Xie and published by John Wiley & Sons. This book was released on 2008-11-03 with total page 352 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book gives you an updated and expert overview of nuclear hormone receptors in drug metabolism and drug development and equips you with the interdisciplinary understanding of these receptors and how they can be regulated. Pharmaceutical researchers will find this extremely useful in developing drugs for cancer, heart disease, and diabetes treatment. This comprehensive resource collects scattered materials into one handy, informative volume.
Download or read book High Density Lipoproteins written by Arnold von Eckardstein and published by Springer. This book was released on 2015-01-13 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this Handbook of Experimental Pharmacology on “High Density Lipoproteins – from biological understanding to clinical exploitation” contributing authors (members of COST Action BM0904/HDLnet) summarize in more than 20 chapters our current knowledge on the structure, function, metabolism and regulation of HDL in health and several diseases as well as the status of past and ongoing attempts of therapeutic exploitation. The book is of interest to researchers in academia and industry focusing on lipoprotein metabolism, cardiovascular diseases and immunology as well as clinical pharmacologists, cardiologists, diabetologists, nephrologists and other clinicians interested in metabolic or inflammatory diseases.
Download or read book Phase II Conjugation Enzymes and Transport Systems written by Helmut Sies and published by Gulf Professional Publishing. This book was released on 2005-11-28 with total page 774 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume on conjugation enzymes and transporters serves to bring together current methods and concepts in an interesting, important and rapidly developing field of cell and systems biology. Phase II Conjugation Enzymes and Transport Systems focuses on the so-called Phase II enzymes of drug metabolism (xenobiotics), which has important ramifications for endogenous metabolism and nutrition. Also included are aspects on Phase III, transport systems. This volume of Methods in Enzymology presents current knowledge and methodology on glucuronidation, sulfation, acetylation, and transport systems in this field of research. Together with the volumes on Quinones and Quinone Enzymes (volumes 378 and 382), and on Glutathione Transferases and gamma-Glutamyl Transpeptidases (volume 401), the state of knowledge on proteomics and metabolomics of many pathways of (waste) product elimination, enzyme protein induction and gene regulation and feedback control is provided. This volume will help stimulate future investigations and speed the advance of knowledge in systems biology. A laboratory standard for more than 40 years Over 400 volumes strong Also available on ScienceDirect
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2007 with total page 902 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Bile Acids and Their Receptors written by Stefano Fiorucci and published by Springer Nature. This book was released on 2019-09-03 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book focusses on the latest results related to the field of bile acids as signaling molecules and describes how these receptors have become a major pharmacological target. It covers all major areas of research in this field, from genetics, chemistry, in silico modeling, molecular biology to clinical applications, offering a cross-country view of the functional role of bile acids as signaling molecules, virtually acting on all major areas of metabolism. While FXR and GPBAR1 are essential bile acid sensors that integrate the de novo bile acid synthesis with intestinal microbiota and liver metabolism, in a broader sense, BARs play a pathogenic role in the development of common human alignments including liver, intestinal and metabolic disorders, such as steatosis (NAFLD) and steato-hepatitis (NASH), diabetes, obesity and atherosclerosis.
Download or read book The Biology of Cholesterol and Related Steroids written by N. B. Myant and published by Butterworth-Heinemann. This book was released on 2014-04-24 with total page 925 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Biology of Cholesterol and Related Steroids focuses on the study of sterols in relation to living organisms. The publication first takes a look at the analysis of sterols and related steroids and the distribution of sterols and related steroids in nature, as well as the processes of extraction and separation and presence of sterols in plants, fungi, vertebrates, and invertebrates. The text then ponders on biosynthesis of sterols and metabolism of cholesterol. Topics include formation of fatty acid esters of cholesterol, steroid hormones, biosynthetic pathway to sterols, reaction mechanisms, and comparative aspects of sterol synthesis. The manuscript examines the developmental aspects of cholesterol metabolism and sterols in biological membranes. The book also reviews cholesterol synthesis in animal tissues, sterol metabolism in isolated cells, and epidemiology of the plasma cholesterol. Discussions focus on selection of statistical populations, genetic influences, regulation of sterol synthesis, general aspects of sterol metabolism, and removal of cell cholesterol in vivo. The publication is a dependable source of data for biochemists and readers interested in the biology of cholesterol and steroids.
Download or read book Sterols and Bile Acids written by and published by Elsevier. This book was released on 1985-01-01 with total page 465 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sterols and Bile Acids
Download or read book Liver Disease in Children written by Frederick J. Suchy and published by Cambridge University Press. This book was released on 2021-03-18 with total page 875 pages. Available in PDF, EPUB and Kindle. Book excerpt: Liver disease in children is increasing in prevalence, placing a huge burden on healthcare systems and often requiring long-term management. Offering an integrative approach to the science and clinical practice of pediatric hepatology, this is the definitive reference text for improved diagnosis and treatment strategies. In the new edition of this authoritative text, chapters have been thoroughly revised in line with major advances in the field, such as recognizing the increased frequency of fatty liver disease, and how genetic testing has the potential to establish earlier diagnoses for a variety of diseases. Disorders covered include cholestasis, metabolic disorders and hepatitis, with their presentation across the spectrum of infancy, childhood and adolescence discussed. The indications and surgical aspects of liver transplant are explained and post-transplant care is described in detail. This is a valuable resource for pediatricians, hepatologists, gastroenterologists and all clinicians involved in the care of children with liver diseases.
Download or read book Vitamin D written by David Feldman and published by Elsevier. This book was released on 2005-01-25 with total page 1970 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vitamin D, a steroid hormone, has mainly been known for its effects on bone and osteoporosis. The current therapeutic practices expand into such markets as cancer research, pediatrics, nephrology, dermatology, immunology, and genetics. This second edition includes over 100 chapters covering everything from chemistry and metabolism to mechanisms of action, diagnosis and management, new analogs, and emerging therapies. This complete reference works is a must have resource for anyone working in endocrinology, osteology, bone biology, or cancer research.*Most comprehensive, up-to-date two-volume set on Vitamin D*New chapters on squamous cell cancer, brain cancer, thyroid cancer and many more*Further sections on emerging uses for treatments of auto-immune diseases and diabetes*Over 600 illustrations and figures available on CD
Download or read book Mammalian Sterols written by Damjana Rozman and published by Springer Nature. This book was released on 2020-08-10 with total page 174 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive description of sterols and their novel biological roles in mammalian signaling, the book covers their biosynthesis and structure, describes sterol receptor -mediated actions, their tissue distribution and their role in disease. It offers insight into new research findings, focusing specifically on novel discoveries in bile acid and oxysterol signaling, including the lanosterol-to-cholesterol intermediates. Special attention is paid on the sex distribution of these sterols (male or female) and their sexually dimorphic roles in mammalian species, such as human, rat and mouse. Since sterols and drugs (xenobiotics) use many identical receptor-mediated signaling pathways, the book will be interesting for researchers working on the cross-road of endogenous and xenobiotic metabolism, it is intended for advanced students and scientists in molecular biology and biochemistry as well as for medical doctors in hepatology.
Download or read book McAlpine s Multiple Sclerosis written by Alastair Compston and published by . This book was released on 1998 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is the latest edition of the classic book on the subject of multiple sclerosis. An international group of authors has been involved in updating this edition which features more information on imaging and investigations, and a new chapter on neurobiology and glial development.
Download or read book Cellular Lipid Metabolism written by Christian Ehnholm and published by Springer Science & Business Media. This book was released on 2009-07-07 with total page 385 pages. Available in PDF, EPUB and Kindle. Book excerpt: For years lipids have fascinated cell biologists and biochemists due to their profound effects on cell function. "Cellular Lipid Metabolism" highlights new concepts and recent findings, but also reviews important discoveries made in the past. Outstanding international experts contribute 13 chapters on the genetics, molecular and cell biology of lipids. Presenting analyses at the molecular level they reveal the principles by which cellular lipid metabolism functions. Further, numerous intriguing observations that cannot yet be explained are identified, stimulating the readers to future studies. This book provides an invaluable source of information for biomedical researchers in energy metabolism, vascular biology, endocrinology and lipidology.
Download or read book Pediatric Hepatology and Liver Transplantation written by Lorenzo D'Antiga and published by Springer. This book was released on 2019-04-29 with total page 829 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book is the first to provide balanced examination of both pediatric liver disease and liver transplantation – two topics that are inherently related, given that most chronic liver disorders eventually require organ replacement. The different forms of liver disease encountered in the pediatric age group are first discussed in a series of disease-specific chapters that have a reader-friendly, uniform structure covering pathophysiology, diagnostic and treatment algorithms, clinical cases, and transition to adult care. Key topics in the field of liver transplantation are then addressed. Examples include indications and contraindications, surgical techniques and complications, immunosuppression, in pediatric liver transplantation, acute and chronic rejection and allograft dysfunction, and CMV and EBV infection in transplant recipients, long-term graft injury and tolerance. A section on pediatric hepatology across the world includes chapters presenting the features and management of pediatric liver disease in South-America, Africa and Asia. A closing section considers what the future holds for pediatric liver disease and its management, including novel genetic testing, cell therapy and gene therapy. Pediatric Hepatology and Liver Transplantation will be of value for a range of practitioners, from residents making their first approach to pediatric liver disease through to specialists working in transplantation centers.
