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Bile acid metabolism

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https://www.readbyqxmd.com/read/27912678/the-physiology-and-molecular-underpinnings-of-the-effects-of-bariatric-surgery-on-obesity-and-diabetes
#1
Simon S Evers, Darleen A Sandoval, Randy J Seeley
Bariatric surgeries, such as Roux-en-Y gastric bypass and vertical sleeve gastrectomy, produce significant and durable weight loss in both humans and rodents. Recently, these surgical interventions have also been termed metabolic surgery because they result in profound metabolic improvements that often surpass the expected improvement due to body weight loss alone. In this review we focus on the weight-loss independent effects of bariatric surgery, which encompass energy expenditure and macronutrient preference, the luminal composition of the gut (i...
November 28, 2016: Annual Review of Physiology
https://www.readbyqxmd.com/read/27907092/unconjugated-bile-acids-influence-expression-of-circadian-genes-a-potential-mechanism-for-microbe-host-crosstalk
#2
Kalaimathi Govindarajan, John MacSharry, Patrick G Casey, Fergus Shanahan, Susan A Joyce, Cormac G M Gahan
Disruptions to circadian rhythm in mice and humans have been associated with an increased risk of obesity and metabolic syndrome. The gut microbiota is known to be essential for the maintenance of circadian rhythm in the host suggesting a role for microbe-host interactions in the regulation of the peripheral circadian clock. Previous work suggested a role for gut bacterial bile salt hydrolase (BSH) activity in the regulation of host circadian gene expression. Here we demonstrate that unconjugated bile acids, known to be generated through the BSH activity of the gut microbiota, are potentially chronobiological regulators of host circadian gene expression...
2016: PloS One
https://www.readbyqxmd.com/read/27904033/impact-of-slc6a-transporters-in-physiological-taurine-transport-at-the-blood-retinal-barrier-and-in-the-liver
#3
Yoshiyuki Kubo, Shin-Ichi Akanuma, Ken-Ichi Hosoya
Cumulative studies showed that taurine (2-aminoethanesulfonic acid) contributes to a variety of physiological events. Transport study suggested the cellular taurine transport in an Na(+)- and Cl(-)-dependent manner, and the several members of SLC6A family have been shown as taurine transporter. At the inner blood-retinal barrier (BRB), taurine transporter (TauT/SLC6A) is involved in the transport of taurine to the retina from the circulating blood. The involvement of TauT is also suggested in γ-aminobutyric acid (GABA) transport at the inner BRB, and its role is assumed in the elimination of GABA from the retinal interstitial fluid...
2016: Biological & Pharmaceutical Bulletin
https://www.readbyqxmd.com/read/27900259/dietary-fat-and-gut-microbiota-interactions-determine-diet-induced-obesity-in-mice
#4
Raphaela Kübeck, Catalina Bonet-Ripoll, Christina Hoffmann, Alesia Walker, Veronika Maria Müller, Valentina Luise Schüppel, Ilias Lagkouvardos, Birgit Scholz, Karl-Heinz Engel, Hannelore Daniel, Philippe Schmitt-Kopplin, Dirk Haller, Thomas Clavel, Martin Klingenspor
OBJECTIVE: Gut microbiota may promote positive energy balance; however, germfree mice can be either resistant or susceptible to diet-induced obesity (DIO) depending on the type of dietary intervention. We here sought to identify the dietary constituents that determine the susceptibility to body fat accretion in germfree (GF) mice. METHODS: GF and specific pathogen free (SPF) male C57BL/6N mice were fed high-fat diets either based on lard or palm oil for 4 wks. Mice were metabolically characterized at the end of the feeding trial...
December 2016: Molecular Metabolism
https://www.readbyqxmd.com/read/27898951/intrauterine-growth-restricted-piglets-have-similar-gastric-emptying-rates-but-lower-rectal-temperatures-and-altered-blood-values-when-compared-with-normal-weight-piglets-at-birth
#5
C Amdi, M V Klarlund, J Hales, T Thymann, C F Hansen
Intrauterine growth-restricted (IUGR) piglets have lower survival rates and are more likely to have empty stomachs 24 h after birth than normal piglets. Although hypoglycemia may result from low colostrum intake per se, it is not known if slow gastric emptying may be an additional risk factor for poor immunization and glucose absorption in IUGR piglets. It is estimated that IUGR piglets consume less colostrum per kilogram BW than normal-weight piglets within the first 24 h, which could be due to a slower gastric emptying rate and a compromised energy metabolism...
November 2016: Journal of Animal Science
https://www.readbyqxmd.com/read/27896398/acute-liver-effects-disposition-and-metabolic-fate-of-14-c-fenclozic-acid-following-oral-administration-to-normal-and-bile-cannulated-male-c57bl-6j-mice
#6
Kathryn Pickup, Scott Martin, Elizabeth A Partridge, Huw B Jones, Jonathan Wills, Tim Schulz-Utermoehl, Alan McCarthy, Alison Rodrigues, Chris Page, Kerry Ratcliffe, Sunil Sarda, Ian D Wilson
The distribution, metabolism, excretion and hepatic effects of the human hepatotoxin fenclozic acid were investigated following single oral doses of 10 mg/kg to normal and bile duct-cannulated male C57BL/6J mice. Whole body autoradiography showed distribution into all tissues except the brain, with radioactivity still detectable in blood, kidney and liver at 72 h post-dose. Mice dosed with [(14)C]-fenclozic acid showed acute centrilobular hepatocellular necrosis, but no other regions of the liver were affected...
November 28, 2016: Archives of Toxicology
https://www.readbyqxmd.com/read/27891833/metabolomics-guided-insights-on-bariatric-surgery-versus-behavioral-interventions-for-weight-loss
#7
REVIEW
Sara Tulipani, Jules Griffin, Magali Palau-Rodriguez, Ximena Mora-Cubillos, Rosa M Bernal-Lopez, Francisco J Tinahones, Barbara E Corkey, Cristina Andres-Lacueva
OBJECTIVE: To review the metabolomic studies carried out so far to identify metabolic markers associated with surgical and dietary treatments for weight loss in subjects with obesity. METHODS: The Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines were followed. RESULTS: Thirty-two studies successfully met the eligibility criteria. The metabolic adaptations shared by surgical and dietary interventions mirrored a state of starvation ketoacidosis (increase of circulating ketone bodies), an increase of acylcarnitines and fatty acid β-oxidation, a decrease of specific amino acids including branched-chain amino acids (BCAA) and (lyso)glycerophospholipids previously associated with obesity, and adipose tissue expansion...
December 2016: Obesity
https://www.readbyqxmd.com/read/27889186/circadian-homeostasis-of-liver-metabolism-suppresses-hepatocarcinogenesis
#8
Nicole M Kettner, Horatio Voicu, Milton J Finegold, Cristian Coarfa, Arun Sreekumar, Nagireddy Putluri, Chinenye A Katchy, Choogon Lee, David D Moore, Loning Fu
Chronic jet lag induces spontaneous hepatocellular carcinoma (HCC) in wild-type mice following a mechanism very similar to that observed in obese humans. The process initiates with non-alcoholic fatty liver disease (NAFLD) that progresses to steatohepatitis and fibrosis before HCC detection. This pathophysiological pathway is driven by jet-lag-induced genome-wide gene deregulation and global liver metabolic dysfunction, with nuclear receptor-controlled cholesterol/bile acid and xenobiotic metabolism among the top deregulated pathways...
November 14, 2016: Cancer Cell
https://www.readbyqxmd.com/read/27888332/interaction-of-gut-microbiota-with-bile-acid-metabolism-and-its-influence-on-disease-states
#9
REVIEW
Christopher Staley, Alexa R Weingarden, Alexander Khoruts, Michael J Sadowsky
Primary bile acids serve important roles in cholesterol metabolism, lipid digestion, host-microbe interactions, and regulatory pathways in the human host. While most bile acids are reabsorbed and recycled via enterohepatic cycling, ∼5% serve as substrates for bacterial biotransformation in the colon. Enzymes involved in various transformations have been characterized from cultured gut bacteria and reveal taxa-specific distribution. More recently, bioinformatic approaches have revealed greater diversity in isoforms of these enzymes, and the microbial species in which they are found...
November 25, 2016: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/27885053/11%C3%AE-hydroxysteroid-dehydrogenase-1-deficiency-alters-the-gut-microbiome-response-to-western-diet
#10
Jethro S Johnson, Monica N Opiyo, Marian Thomson, Karim Gharbi, Jonathan R Seckl, Andreas Heger, Karen Chapman
The enzyme 11β-hydroxysteroid dehydrogenase (11β-HSD) interconverts active glucocorticoids and their intrinsically inert 11-keto forms. The type 1 isozyme, 11β-HSD1, predominantly reactivates glucocorticoids in vivo and can also metabolise bile acids. 11β-HSD1-deficient mice show altered inflammatory responses and are protected against the adverse metabolic effects of a high fat diet. However, the influence of 11β-HSD1 on the composition of the gut microbiome has not previously been investigated. We used high-throughput 16S rDNA amplicon sequencing to characterize the gut microbiome of 11β-HSD1-deficient and C57Bl/6 control mice, fed either a standard chow diet or a cholesterol and fat-enriched 'western' diet...
November 24, 2016: Journal of Endocrinology
https://www.readbyqxmd.com/read/27884763/acox2-deficiency-an-inborn-error-of-bile-acid-synthesis-identified-in-an-adolescent-with-persistent-hypertransaminasemia
#11
Maria J Monte, Marta Alonso-Peña, Oscar Briz, Elisa Herraez, Carmen Berasain, Josepmaria Argemi, Jesus Prieto, Jose J G Marin
BACKGROUND: Acyl-CoA oxidase (ACOX2) is involved in the shortening of C27 cholesterol derivatives to generate C24 bile acids. Inborn errors affecting the rest of peroxisomal enzymes involved in bile acid biosynthesis have been described. These conditions are usually characterized by serious hepatic and/or neurologic manifestations. AIMS: We have investigated bile acid profile and enzymes involved in their biosynthesis in the first reported case of ACOX2 deficiency identified in an adolescent boy with persistent unexplained hypertransaminasemia and his family...
November 21, 2016: Journal of Hepatology
https://www.readbyqxmd.com/read/27881673/sortilin-1-modulates-hepatic-cholesterol-lipotoxicity-in-mice-via-functional-interaction-with-liver-carboxylesterase-1
#12
Jibiao Li, Yifeng Wang, David Matye, Hemantkumar Chavan, Partha Krishnamurthy, Feng Li, Tiangang Li
Liver plays a key role in cholesterol metabolism. Impaired hepatic cholesterol homeostasis causes intracellular free cholesterol accumulation and hepatocyte injury. Sortilin 1 (Sort1) is an intracellular lysosomal trafficking receptor that was recently identified by GWAS as a novel regulator of cholesterol metabolism in humans. Here we report that Sort1 deficiency protected against cholesterol accumulation-induced liver injury and inflammation in mice. Using LC-MS/MS based proteomics approach, we identified liver carboxyesterase 1 (CES1) as a novel Sort1 interacting protein...
November 23, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27875503/influence-of-partial-external-biliary-diversion-on-the-lipid-profile-in-children-with-progressive-familial-intrahepatic-cholestasis
#13
Irena Jankowska, Piotr Czubkowski, Aldona Wierzbicka, Joanna Pawłowska, Piotr Kaliciński, Piotr Socha
OBJECTIVES: The concentration of bile acids is highly increased in progressive familial intrahepatic cholestasis (PFIC). Bile acids are the end products of cholesterol metabolism, and aid in the absorption of fat-soluble vitamins and dietary fat. The aim of our study was to investigate lipid metabolism in patients with PFIC with focus on the effect of partial external biliary diversion (PEBD). METHODS: In 26 patients with PFIC, who underwent PEBD surgery at the median age of 2...
December 2016: Journal of Pediatric Gastroenterology and Nutrition
https://www.readbyqxmd.com/read/27869139/the-transcription-cofactor-crtc1-protects-from-aberrant-hepatic-lipid-accumulation
#14
Hwijin Kim
Nonalcoholic fatty liver disease (NAFLD) is a rapidly emerging global health-problem. NAFLD encompasses a range of conditions associated with hepatic steatosis, aberrant accumulation of fat in hepatocytes. Although obesity and metabolic syndrome are considered to have a strong association with NAFLD, genetic factors that predispose liver to NAFLD and molecular mechanisms by which excess hepatic lipid develops remain largely unknown. We report that the transcription cofactor CRTC1 confers broad spectrum protection against hepatic steatosis development...
November 21, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27864543/long-non-coding-rnas-a-novel-paradigm-for-toxicology
#15
REVIEW
Joseph L Dempsey, Julia Yue Cui
Long non-coding RNAs (lncRNAs) are over 200 nucleotides in length and are transcribed from the mammalian genome in a tissue-specific and developmentally regulated pattern. There is growing recognition that lncRNAs are novel biomarkers and/or key regulators of toxicological responses in humans and animal models. Lacking protein-coding capacity, the numerous types of lncRNAs possess a myriad of transcriptional regulatory functions that include cis and trans gene expression, transcription factor activity, chromatin remodeling, imprinting, and enhancer up-regulation...
November 17, 2016: Toxicological Sciences: An Official Journal of the Society of Toxicology
https://www.readbyqxmd.com/read/27860077/critical-in-vivo-roles-of-histamine-and-histamine-receptor-signaling-in-animal-models-of-metabolic-syndrome
#16
REVIEW
Sohsuke Yamada, Akihide Tanimoto, Yasuyuki Sasaguri
Histamine, a classic low-molecular-weight amine, is synthesized from L-histidine by histidine decarboxylase (HDC), and histamine-specific receptors (HRs) are essential for its actions. Our serial in vivo studies have uniquely reported that expression of histamine/HRs is variably identified in atherosclerotic lesions, and that HDC-gene knockout mice without histamine/HRs signaling show a marked reduction of atherosclerotic progression. These data have convinced us that histamine plays a pivotal role in the pathogenesis of atherosclerosis...
December 2016: Pathology International
https://www.readbyqxmd.com/read/27858369/cerebrotendinous-xanthomatosis-presenting-with-infantile-spasms-and-intellectual-disability
#17
Austin Larson, James D Weisfeld-Adams, Tim A Benke, Penelope E Bonnen
Cerebrotendinous xanthomatosis (CTX) is an inborn error of metabolism leading to progressive multisystem disease. Symptoms often begin in the first decade of life with chronic diarrhea, cataracts, developmental delay, intellectual disability, and cerebellar or pyramidal dysfunction. Later manifestations include tendon xanthomas, polyneuropathy, and abnormal neuroimaging. Pathogenic biallelic variants in CYP27A1 leading to compromised function of sterol 27-hydroxylase result in accumulation of detectable toxic intermediates of bile acid synthesis rendering both genetic and biochemical testing effective diagnostic tools...
November 18, 2016: JIMD Reports
https://www.readbyqxmd.com/read/27856001/enteral-high-fat-polyunsaturated-fatty-acid-blend-alters-the-pathogen-composition-of-the-intestinal-microbiome-in-premature-infants-with-an-enterostomy
#18
Noelle Younge, Qing Yang, Patrick C Seed
OBJECTIVE: To determine the effect of enteral fish oil and safflower oil supplementation on the intestinal microbiome in infants with an enterostomy born premature. STUDY DESIGN: Infants with an enterostomy born premature were randomized to receive early enteral supplementation with a high-fat polyunsaturated fatty acid (HF-PUFA) blend of fish oil and safflower oil vs standard nutritional therapy. We used 16S rRNA gene sequencing for longitudinal profiling of the microbiome from the time of study entry until bowel reanastomosis...
November 15, 2016: Journal of Pediatrics
https://www.readbyqxmd.com/read/27853525/bacteriocin-production-a-relatively-unharnessed-probiotic-trait
#19
REVIEW
James W Hegarty, Caitriona M Guinane, R Paul Ross, Colin Hill, Paul D Cotter
Probiotics are "live microorganisms which, when consumed in adequate amounts, confer a health benefit to the host". A number of attributes are highly sought after among these microorganisms, including immunomodulation, epithelial barrier maintenance, competitive exclusion, production of short-chain fatty acids, and bile salt metabolism. Bacteriocin production is also generally regarded as a probiotic trait, but it can be argued that, in contrast to other traits, it is often considered a feature that is desirable, rather than a key probiotic trait...
2016: F1000Research
https://www.readbyqxmd.com/read/27848961/diet-microorganisms-and-their-metabolites-and-colon-cancer
#20
REVIEW
Stephen J D O'Keefe
Colorectal cancer is one of the so-called westernized diseases and the second leading cause of cancer death worldwide. On the basis of global epidemiological and scientific studies, evidence suggests that the risk of colorectal cancer is increased by processed and unprocessed meat consumption but suppressed by fibre, and that food composition affects colonic health and cancer risk via its effects on colonic microbial metabolism. The gut microbiota can ferment complex dietary residues that are resistant to digestion by enteric enzymes...
November 16, 2016: Nature Reviews. Gastroenterology & Hepatology
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