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bile acid and gut microbiome

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https://www.readbyqxmd.com/read/28095889/evolution-of-gut-microbiota-composition-from-birth-to-24-weeks-in-the-infantmet-cohort
#1
Cian J Hill, Denise B Lynch, Kiera Murphy, Marynka Ulaszewska, Ian B Jeffery, Carol Anne O'Shea, Claire Watkins, Eugene Dempsey, Fulvio Mattivi, Kieran Touhy, R Paul Ross, C Anthony Ryan, Paul W O' Toole, Catherine Stanton
BACKGROUND: The gut is the most extensively studied niche of the human microbiome. The aim of this study was to characterise the initial gut microbiota development of a cohort of breastfed infants (n = 192) from 1 to 24 weeks of age. METHODS: V4-V5 region 16S rRNA amplicon Illumina sequencing and, in parallel, bacteriological culture. The metabolomic profile of infant urine at 4 weeks of age was also examined by LC-MS. RESULTS: Full-term (FT), spontaneous vaginally delivered (SVD) infants' microbiota remained stable at both phylum and genus levels during the 24-week period examined...
January 17, 2017: Microbiome
https://www.readbyqxmd.com/read/28074537/neuroblastoma-causes-alterations-of-the-intestinal-microbiome-gut-hormones-inflammatory-cytokines-and-bile-acid-composition
#2
Christoph Castellani, Georg Singer, Margarita Kaiser, Thomas Kaiser, Jianfeng Huang, Daniela Sperl, Karl Kashofer, Guenter Fauler, Barbara Guertl-Lackner, Gerald Höfler, Holger Till
OBJECTIVE: To assess the effect of neuroblastoma (NB) on the intestinal microbiome, metabolism, and inflammatory parameters in a murine model. MATERIALS AND METHODS: Athymic Hsd:Fox1nu mice received subperitoneal implantation of human NB cells (MHH-NB11) (tumor group, TG) or culture medium (sham group). Following 10 weeks of tumor growth, all animals were sacrificed to collect total white adipose tissue (WAT). Luminex assays were performed for gut hormone and inflammation marker analysis...
January 11, 2017: Pediatric Blood & Cancer
https://www.readbyqxmd.com/read/27997972/changes-in-the-microbiome-in-cirrhosis-and-relationship-to-complications-hepatic-encephalopathy-spontaneous-bacterial-peritonitis-and-sepsis
#3
Jatinder Lachar, Jasmohan S Bajaj
Chronic liver disease with progression to decompensated cirrhosis and its associated complications, including hepatic encephalopathy, spontaneous bacterial peritonitis, and sepsis, is a leading cause of mortality and morbidity. The pathophysiology of decompensated cirrhosis, which is being intensively studied, leads to the development of gut microbiome changes causing dysbiosis. This is likely related to altered bile acid composition, with a subsequent increase in the relative abundance of potentially pathogenic bacteria that contributes to hepatic encephalopathy and leads to their translocation and the development of spontaneous bacterial peritonitis and bacteremia...
September 2016: Seminars in Liver Disease
https://www.readbyqxmd.com/read/27966366/the-metabolic-phenotype-of-obesity-in-a-saudi-population
#4
Muhammad Saeed Ahmad, Munirah Alsaleh, Torben Kimhofer, Sultan Ahmad, Wisam Jamal, Siraj Omar Wali, Jeremy Kirk Nicholson, Zoheir Abdullah Damanhouri, Elaine Holmes
Metabolic phenotyping of obese populations can shed light on understanding environmental interactions underpinning obesogenesis. Obesity and its comorbidities are a major health and socioeconomic concern globally and are highly prevalent in the Middle East. We employed nuclear magnetic resonance spectroscopy (NMR) to characterise the metabolic signature of urine and blood plasma for a cohort of (n=50) obese compared to non-obese Saudi participants (n=48). The urinary metabolic phenotype of obesity was characterised by higher concentrations of N-acetyl glycoprotein fragment, bile acids, lysine and methylamines and lower concentrations of tricarboxylic acid cycle intermediates, glycine and gut microbial metabolites...
December 14, 2016: Journal of Proteome Research
https://www.readbyqxmd.com/read/27929465/using-multi-fluorinated-bile-acids-and-in-vivo-magnetic-resonance-imaging-to-measure-bile-acid-transport
#5
Jessica Felton, Kunrong Cheng, Anan Said, Aaron C Shang, Su Xu, Diana Vivian, Melissa Metry, James E Polli, Jean-Pierre Raufman
Along with their traditional role as detergents that facilitate fat absorption, emerging literature indicates that bile acids are potent signaling molecules that affect multiple organs; they modulate gut motility and hormone production, and alter vascular tone, glucose metabolism, lipid metabolism, and energy utilization. Changes in fecal bile acids may alter the gut microbiome and promote colon pathology including cholerrheic diarrhea and colon cancer. Key regulators of fecal bile acid composition are the small intestinal Apical Sodium-dependent Bile Acid Transporter (ASBT) and fibroblast growth factor-19 (FGF19)...
November 27, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27885053/11%C3%AE-hydroxysteroid-dehydrogenase-1-deficiency-alters-the-gut-microbiome-response-to-western-diet
#6
Jethro S Johnson, Monica N Opiyo, Marian Thomson, Karim Gharbi, Jonathan R Seckl, Andreas Heger, Karen E 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 impact of 11β-HSD1 on the composition of the gut microbiome has not previously been investigated. We used high-throughput 16S rDNA amplicon sequencing to characterise 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...
February 2017: Journal of Endocrinology
https://www.readbyqxmd.com/read/27832649/bile-acids-and-the-potential-role-in-primary-biliary-cirrhosis
#7
Hang Yang, Zhijun Duan
BACKGROUND: Bile acids (BAs) play a potential role in regulating the whole-body metabolic homeostasis via the interaction with gut microbiome and the signal transduction as messengers, which establish a link between the primary biliary cirrhosis (PBC) and gut microbiome in many aspects, particularly with regard to the immune system of the body. PBC, as a chronic cholestatic liver disease characterised by the destruction of small intrahepatic bile ducts, causes fibrosis and potential cirrhosis without efficient therapies...
2016: Digestion
https://www.readbyqxmd.com/read/27818587/improved-glucose-metabolism-following-bariatric-surgery-is-associated-with-increased-circulating-bile-acid-concentrations-and-remodeling-of-the-gut-microbiome
#8
REVIEW
Lukasz Kaska, Tomasz Sledzinski, Agnieszka Chomiczewska, Agnieszka Dettlaff-Pokora, Julian Swierczynski
Clinical studies have indicated that circulating bile acid (BA) concentrations increase following bariatric surgery, especially following malabsorptive procedures such as Roux-en-Y gastric bypasses (RYGB). Moreover, total circulating BA concentrations in patients following RYGB are positively correlated with serum glucagon-like peptide-1 concentrations and inversely correlated with postprandial glucose concentrations. Overall, these data suggest that the increased circulating BA concentrations following bariatric surgery - independently of calorie restriction and body-weight loss - could contribute, at least in part, to improvements in insulin sensitivity, incretin hormone secretion, and postprandial glycemia, leading to the remission of type-2 diabetes (T2DM)...
October 21, 2016: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/27739136/bariatric-surgery-and-type-2-diabetes-are-there-weight-loss-independent-therapeutic-effects-of-upper-gastrointestinal-bypass
#9
M Chondronikola, L L S Harris, S Klein
Type 2 diabetes (T2D) is a major worldwide public health concern. Despite a large armamentarium of T2D medications, a large proportion of patients fail to achieve recommended treatment goals for glycemic control. Weight loss has profound beneficial effects on the metabolic abnormalities involved in the pathogenesis of T2D. Accordingly, bariatric surgery, which is the most effective available weight loss therapy, is also the most effective therapy for treating patients with T2D. Surgical procedures that bypass the upper gastrointestinal (UGI) tract are particularly effective in achieving partial and even complete remission of T2D, suggesting that UGI bypass has weight loss-independent effects on glycemic control...
November 2016: Journal of Internal Medicine
https://www.readbyqxmd.com/read/27676197/human-microbiome-as-therapeutic-intervention-target-to-reduce-cardiovascular-disease-risk
#10
Annefleur M Koopen, Albert K Groen, Max Nieuwdorp
PURPOSE OF REVIEW: The absolute burden of cardiovascular risk remains high despite currently available preventive and therapeutic options. In search for novel therapeutic leads, mounting evidence has linked the gut microbiota as well as their metabolites to the development of cardiometabolic diseases. RECENT FINDINGS: The intestinal microbiota influences the host via different metabolic pathways as inducer of endotoxemia, formation of trimethylamine-N-oxide, production of short chain fatty acids, and is a regulator in intestinal bile acid metabolism...
September 26, 2016: Current Opinion in Lipidology
https://www.readbyqxmd.com/read/27646933/current-and-upcoming-pharmacotherapy-for-non-alcoholic-fatty-liver-disease
#11
REVIEW
Yaron Rotman, Arun J Sanyal
Given the high prevalence and rising incidence of non-alcoholic fatty liver disease (NAFLD), the absence of approved therapies is striking. Although the mainstay of treatment of NAFLD is weight loss, it is hard to maintain, prompting the need for pharmacotherapy as well. A greater understanding of disease pathogenesis in recent years was followed by development of new classes of medications, as well as potential repurposing of currently available agents. NAFLD therapies target four main pathways. The dominant approach is targeting hepatic fat accumulation and the resultant metabolic stress...
January 2017: Gut
https://www.readbyqxmd.com/read/27633134/gut-microbiota-and-type-2-diabetes-mellitus
#12
Araceli Muñoz-Garach, Cristina Diaz-Perdigones, Francisco J Tinahones
In recent years, many studies have related gut microbiome to development of highly prevalent diseases such as type 2 diabetes and obesity. Obesity itself is associated to changes in the composition of gut microbiome, with a trend to an overgrowth of microorganisms more efficiently obtaining energy from diet. There are several mechanisms that relate microbiota to the onset of insulin resistance and diabetes, including changes in bowel permeability, endotoxemia, interaction with bile acids, changes in the proportion of brown adipose tissue, and effects associated to use of drugs like metformin...
December 2016: Endocrinología y Nutrición: órgano de la Sociedad Española de Endocrinología y Nutrición
https://www.readbyqxmd.com/read/27617201/non-alcoholic-fatty-liver-and-the-gut-microbiota
#13
Stavros Bashiardes, Hagit Shapiro, Shachar Rozin, Oren Shibolet, Eran Elinav
BACKGROUND: Non-alcoholic fatty liver (NAFLD) is a common, multi-factorial, and poorly understood liver disease whose incidence is globally rising. NAFLD is generally asymptomatic and associated with other manifestations of the metabolic syndrome. Yet, up to 25% of NAFLD patients develop a progressive inflammatory liver disease termed non-alcoholic steatohepatitis (NASH) that may progress towards cirrhosis, hepatocellular carcinoma, and the need for liver transplantation. In recent years, several lines of evidence suggest that the gut microbiome represents a significant environmental factor contributing to NAFLD development and its progression into NASH...
September 2016: Molecular Metabolism
https://www.readbyqxmd.com/read/27592213/liver-steatosis-induced-by-small-bowel-resection-is-prevented-by-oral-vancomycin
#14
Lauren K Barron, Christopher P Gayer, Anne Roberts, Jamie M Golden, Bola G Aladegbami, Jun Guo, Christopher R Erwin, Brad W Warner
BACKGROUND: Intestinal failure-associated liver disease causes significant mortality in patients with short bowel syndrome. Steatosis, a major component of intestinal failure-associated liver disease has been shown to persist even after weaning from parenteral nutrition. We sought to determine whether steatosis occurs in our murine model of short bowel syndrome and whether steatosis was affected by manipulation of the intestinal microbiome. METHODS: Male C57BL6 mice underwent 50% small bowel resection and orogastric gavage with vancomycin or vehicle for 10 weeks...
December 2016: Surgery
https://www.readbyqxmd.com/read/27568472/effects-of-various-gastrointestinal-procedures-on-%C3%AE-cell-function-in-obesity-and-type-2-diabetes
#15
REVIEW
Steven K Malin, Sangeeta R Kashyap
Bariatric surgery is a gastrointestinal procedure that has emerged as the most effective treatment for weight loss. Roux-en-Y gastric bypass and sleeve gastrectomy are the main procedures currently performed. However, the benefits of bariatric surgery extend beyond weight loss. In fact, improvements in β-cell function occur before clinically meaningful weight loss and contribute to type 2 diabetes mellitus (T2D) remission. Herein, we discuss evidence supporting the efficacy of bariatric surgery for weight loss and improved insulin secretion in patients with and without T2D...
July 2016: Surgery for Obesity and related Diseases: Official Journal of the American Society for Bariatric Surgery
https://www.readbyqxmd.com/read/27531998/mucosal-interactions-between-genetics-diet-and-microbiome-in-inflammatory-bowel-disease
#16
REVIEW
Abigail Basson, Ashley Trotter, Alex Rodriguez-Palacios, Fabio Cominelli
Numerous reviews have discussed gut microbiota composition changes during inflammatory bowel diseases (IBD), particularly Crohn's disease (CD). However, most studies address the observed effects by focusing on studying the univariate connection between disease and dietary-induced alterations to gut microbiota composition. The possibility that these effects may reflect a number of other interconnected (i.e., pantropic) mechanisms, activated in parallel, particularly concerning various bacterial metabolites, is in the process of being elucidated...
2016: Frontiers in Immunology
https://www.readbyqxmd.com/read/27512828/an-integrated-multi-omic-approach-to-assess-radiation-injury-on-the-host-microbiome-axis
#17
Maryam Goudarzi, Tytus D Mak, Jonathan P Jacobs, Bo-Hyun Moon, Steven J Strawn, Jonathan Braun, David J Brenner, Albert J Fornace, Heng-Hong Li
Medical responders to radiological and nuclear disasters currently lack sufficient high-throughput and minimally invasive biodosimetry tools to assess exposure and injury in the affected populations. For this reason, we have focused on developing robust radiation exposure biomarkers in easily accessible biofluids such as urine, serum and feces. While we have previously reported on urine and serum biomarkers, here we assessed perturbations in the fecal metabolome resulting from exposure to external X radiation in vivo...
September 2016: Radiation Research
https://www.readbyqxmd.com/read/27503935/preserved-gut-microbial-diversity-accompanies-upregulation-of-tgr5-and-hepatobiliary-transporters-in-bile-acid-treated-animals-receiving-parenteral-nutrition
#18
Ajay Kumar Jain, Abhineet Sharma, Sumit Arora, Keith Blomenkamp, Ik Chan Jun, Robert Luong, David John Westrich, Aayush Mittal, Paula M Buchanan, Miguel A Guzman, John Long, Brent A Neuschwander-Tetri, Jeffery Teckman
BACKGROUND: Parenteral nutrition (PN) is a lifesaving therapy but is associated with gut atrophy and cholestasis. While bile acids (BAs) can modulate intestinal growth via gut receptors, the gut microbiome likely influences gut proliferation and inflammation. BAs also regulate the bile salt export pump (BSEP) involved in cholestasis. We hypothesized that the BA receptor agonist oleanolic acid (OA) regulates gut TGR5 receptor and modulates gut microbiota to prevent PN-associated injury...
August 8, 2016: JPEN. Journal of Parenteral and Enteral Nutrition
https://www.readbyqxmd.com/read/27431238/bat117213-ileal-bile-acid-transporter-ibat-inhibition-as-a-treatment-for-pruritus-in-primary-biliary-cirrhosis-study-protocol-for-a-randomised-controlled-trial
#19
RANDOMIZED CONTROLLED TRIAL
Vinod S Hegade, Stuart F W Kendrick, Robert L Dobbins, Sam R Miller, Duncan Richards, James Storey, George Dukes, Kim Gilchrist, Susan Vallow, Graeme J Alexander, Margaret Corrigan, Gideon M Hirschfield, David E J Jones
BACKGROUND: Pruritus (itch) is a symptom commonly experienced by patients with cholestatic liver diseases such as primary biliary cholangitis (PBC, previously referred to as primary biliary cirrhosis). Bile acids (BAs) have been proposed as potential pruritogens in PBC. The ileal bile acid transporter (IBAT) protein expressed in the distal ileum plays a key role in the enterohepatic circulation of BAs. Pharmacological inhibition of IBAT with GSK2330672 may reduce BA levels in the systemic circulation and improve pruritus...
July 19, 2016: BMC Gastroenterology
https://www.readbyqxmd.com/read/27322559/environmental-enteric-dysfunction-is-associated-with-altered-bile-acid-metabolism
#20
Richard D Semba, Marta Gonzalez-Freire, Ruin Moaddel, Indi Trehan, Kenneth M Maleta, Mohammed Khadeer, M Isabel Ordiz, Luigi Ferrucci, Mark J Manary
OBJECTIVES: Environmental enteric dysfunction (EED), a clinically asymptomatic condition characterized by inflammation of the small bowel mucosa, villous atrophy, and increased gut permeability, is common among children in developing countries. Because of abnormal gut mucosa and altered gut microbiome, EED could potentially affect the metabolism and enterohepatic circulation of bile acids. METHODS: In 313 children, aged 12-59 months, EED was assessed by the dual sugar absorption test...
June 17, 2016: Journal of Pediatric Gastroenterology and Nutrition
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