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akkermansia muciniphila

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https://www.readbyqxmd.com/read/27924082/duodenal-endoluminal-barrier-sleeve-alters-gut-microbiota-of-zdf-rats
#1
T Kim, C L Holleman, T Ptacek, C D Morrow, K M Habegger
BACKGROUND/OBJECTIVES: The combination of energy dense diets and reduced energy expenditure in modern society has escalated the prevalence of obesity and obesity-related comorbidities. Among these disease-states, type-2 diabetics (T2D) are disproportionately associated with obesity, suggesting a shared etiology. In conjunction with defects in hormonal and inflammatory states, obesity and T2D are also characterized by dysbiosis. METHODS: We have recently described the beneficial effects of duodenal nutrient exclusion, as induced by the duodenal endoluminal sleeve (DES); including body weight loss, prevented fat mass accumulation, and improved glucose tolerance in the ZDF rat, a rodent model of obesity and type-2 diabetes (T2D)...
December 7, 2016: International Journal of Obesity: Journal of the International Association for the Study of Obesity
https://www.readbyqxmd.com/read/27895587/vitamin-d-signaling-through-induction-of-paneth-cell-defensins-maintains-gut-microbiota-and-improves-metabolic-disorders-and-hepatic-steatosis-in-animal-models
#2
Danmei Su, Yuanyang Nie, Airu Zhu, Zishuo Chen, Pengfei Wu, Li Zhang, Mei Luo, Qun Sun, Linbi Cai, Yuchen Lai, Zhixiong Xiao, Zhongping Duan, Sujun Zheng, Guihui Wu, Richard Hu, Hidekazu Tsukamoto, Aurelia Lugea, Zhenqui Liu, Stephen J Pandol, Yuan-Ping Han
Metabolic syndrome (MetS), characterized as obesity, insulin resistance, and non-alcoholic fatty liver diseases (NAFLD), is associated with vitamin D insufficiency/deficiency in epidemiological studies, while the underlying mechanism is poorly addressed. On the other hand, disorder of gut microbiota, namely dysbiosis, is known to cause MetS and NAFLD. It is also known that systemic inflammation blocks insulin signaling pathways, leading to insulin resistance and glucose intolerance, which are the driving force for hepatic steatosis...
2016: Frontiers in Physiology
https://www.readbyqxmd.com/read/27892954/a-purified-membrane-protein-from-akkermansia-muciniphila-or-the-pasteurized-bacterium-improves-metabolism-in-obese-and-diabetic-mice
#3
Hubert Plovier, Amandine Everard, Céline Druart, Clara Depommier, Matthias Van Hul, Lucie Geurts, Julien Chilloux, Noora Ottman, Thibaut Duparc, Laeticia Lichtenstein, Antonis Myridakis, Nathalie M Delzenne, Judith Klievink, Arnab Bhattacharjee, Kees C H van der Ark, Steven Aalvink, Laurent O Martinez, Marc-Emmanuel Dumas, Dominique Maiter, Audrey Loumaye, Michel P Hermans, Jean-Paul Thissen, Clara Belzer, Willem M de Vos, Patrice D Cani
Obesity and type 2 diabetes are associated with low-grade inflammation and specific changes in gut microbiota composition. We previously demonstrated that administration of Akkermansia muciniphila to mice prevents the development of obesity and associated complications. However, the underlying mechanisms of this protective effect remain unclear. Moreover, the sensitivity of A. muciniphila to oxygen and the presence of animal-derived compounds in its growth medium currently limit the development of translational approaches for human medicine...
November 28, 2016: Nature Medicine
https://www.readbyqxmd.com/read/27824274/in-vitro-colonisation-of-the-distal-colon-by-akkermansia-muciniphila-is-largely-mucin-and-ph-dependent
#4
F Van Herreweghen, P Van den Abbeele, T De Mulder, R De Weirdt, A Geirnaert, E Hernandez-Sanabria, R Vilchez-Vargas, R Jauregui, D H Pieper, C Belzer, W M De Vos, T Van de Wiele
Host mucin is the main constituent of the mucus layer that covers the gut epithelium of the host, and an important source of glycans for the bacteria colonising the intestine. Akkermansia muciniphila is a mucin-degrading bacterium, abundant in the human gut, that is able to produce acetate and propionate during this degradation process. A. muciniphila has been correlated with human health in previous studies, but a mechanistic explanation is lacking. In this study, the main site of colonisation was characterised alongside additional conditions, such as differences in colon pH, prebiotic supplementation and variable mucin supply...
November 8, 2016: Beneficial Microbes
https://www.readbyqxmd.com/read/27821438/akkermansia-muciniphila-improves-metabolic-profiles-by-reducing-inflammation-in-chow-diet-fed-mice
#5
Shaoqian Zhao, Wen Liu, Jiqiu Wang, Juan Shi, Yingkai Sun, Weiqing Wang, Guang Ning, Ruixin Liu, Jie Hong
Abnormal shifts in the composition of gut microbiota contribute to the pathogenesis of metabolic diseases, including obesity and type 2 diabetes (T2DM). The crosstalk between gut microbes and the host affects the inflammatory status and glucose tolerance of the individuals, but the underlying mechanisms have not been elucidated completely. In this study, we treated the lean chow diet-fed mice with Akkermansia muciniphila, which is thought to be inversely correlated with inflammation status and body weight in rodents and humans, and we found that A...
January 2017: Journal of Molecular Endocrinology
https://www.readbyqxmd.com/read/27812181/altered-gut-microbiota-composition-associated-with-eczema-in-infants
#6
Huajun Zheng, Hong Liang, Yuezhu Wang, Maohua Miao, Tao Shi, Fen Yang, Enuo Liu, Wei Yuan, Zai-Si Ji, De-Kun Li
Eczema is frequently the first manifestation of an atopic diathesis and alteration in the diversity of gut microbiota has been reported in infants with eczema. To identify specific bacterial communities associated with eczema, we conducted a case-control study of 50 infants with eczema (cases) and 51 healthy infants (controls). We performed high-throughput sequencing for V3-V4 hypervariable regions of the 16S rRNA genes from the gut fecal material. A total of 12,386 OTUs (operational taxonomic units) at a 97% similarity level were obtained from the two groups, and we observed a difference in taxa abundance, but not the taxonomic composition, of gut microbiota between the two groups...
2016: PloS One
https://www.readbyqxmd.com/read/27805918/early-changes-in-microbial-community-structure-are-associated-with-sustained-remission-after-nutritional-treatment-of-pediatric-crohn-s-disease
#7
Katherine A Dunn, Jessica Moore-Connors, Brad MacIntyre, Andrew W Stadnyk, Nikhil A Thomas, Angela Noble, Gamal Mahdi, Mohsin Rashid, Anthony R Otley, Joseph P Bielawski, Johan Van Limbergen
BACKGROUND: Clinical remission achieved by exclusive enteral nutrition (EEN) is associated with marked microbiome changes. In this prospective study of exclusive enteral nutrition, we employ a hierarchical model of microbial community structure to distinguish between pediatric Crohn's disease patients who achieved sustained remission (SR) and those who relapsed early (non-SR), after restarting a normal diet. METHODS: Fecal samples were obtained from 10 patients (age 10-16) and from 5 healthy controls (age 9-14)...
December 2016: Inflammatory Bowel Diseases
https://www.readbyqxmd.com/read/27753990/ed-05-2-interaction-of-gut-dysbiosis-and-innate-immune-dysfunction-in-the-development-of-metabolic-syndrome
#8
Myung-Shik Lee
Low-grade systemic inflammation in adipose tissues or liver, is an important etiologic factor in insulin resistance. LPS is an important element causing such metabolic inflammation, and intestinal flora is considered a major source of systemic LPS. We studied changes of intestinal microbiota associated with high-fat diet (HFD) that causes insulin resistance and metabolic stress. 16S rRNA gene sequencing showed that HFD significantly decreased the abundance of a mucin-degrading bacterium Akkermansia muciniphila compared to control diet...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27733402/protein-and-zinc-deficient-diets-modulate-the-murine-microbiome-and-metabolic-phenotype
#9
Jordi Mayneris-Perxachs, David T Bolick, Joy Leng, Greg L Medlock, Glynis L Kolling, Jason A Papin, Jonathan R Swann, Richard L Guerrant
BACKGROUND: Environmental enteropathy, which is linked to undernutrition and chronic infections, affects the physical and mental growth of children in developing areas worldwide. Key to understanding how these factors combine to shape developmental outcomes is to first understand the effects of nutritional deficiencies on the mammalian system including the effect on the gut microbiota. OBJECTIVE: We dissected the nutritional components of environmental enteropathy by analyzing the specific metabolic and gut-microbiota changes that occur in weaned-mouse models of zinc or protein deficiency compared with well-nourished controls...
November 2016: American Journal of Clinical Nutrition
https://www.readbyqxmd.com/read/27678062/aguamiel-concentrate-from-agave-salmiana-and-its-extracted-saponins-attenuated-obesity-and-hepatic-steatosis-and-increased-akkermansia-muciniphila-in-c57bl6-mice
#10
Ana María Leal-Díaz, Lilia G Noriega, Ivan Torre-Villalvazo, Nimbe Torres, Gabriela Alemán-Escondrillas, Patricia López-Romero, Mónica Sánchez-Tapia, Miriam Aguilar-López, Janette Furuzawa-Carballeda, Laura A Velázquez-Villegas, Azalia Avila-Nava, Guillermo Ordáz, Janet A Gutiérrez-Uribe, Sergio O Serna-Saldivar, Armando R Tovar
Obesity and its comorbidities are a severe public health problem worldwide. The use of bioactive compounds found in some foods has been demonstrated to ameliorate the metabolic abnormalities associated with obesity. The purpose of this study was to assess whether the bioactive compounds present in aguamiel concentrate (AC) from Agave salmiana could attenuate glucose intolerance and hepatic steatosis in mice fed a high fat (HF) diet. HPLC-ELSD analysis showed that AC contained several saponins. The consumption of an AC extract rich in saponins reduced weight gain and fat mass and lowered serum glucose, insulin and LDL-cholesterol levels in mice fed a HF diet...
September 28, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27663027/adaptation-of-akkermansia-muciniphila-to-the-oxic-anoxic-interface-of-the-mucus-layer
#11
Janneke P Ouwerkerk, Kees C H van der Ark, Mark Davids, Nico J Claassens, Teresa Robert Finestra, Willem M de Vos, Clara Belzer
: Akkermansia muciniphila colonizes the mucus layer of the gastrointestinal tract where the organism can be exposed to the oxygen that diffuses from epithelial cells. To understand how A. muciniphila is able to survive and grow at this oxic-anoxic interface, its oxygen tolerance, response and reduction capacities were studied. A. muciniphila was found to be oxygen-tolerant. On top of this, under aerated conditions, A. muciniphila showed significant oxygen reduction capacities and its growth rate and yield were increased as compared to strict anaerobic conditions...
September 23, 2016: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/27642901/ed-05-2-interaction-of-gut-dysbiosis-and-innate-immune-dysfunction-in-the-development-of-metabolic-syndrome
#12
Myung-Shik Lee
Low-grade systemic inflammation in adipose tissues or liver, is an important etiologic factor in insulin resistance. LPS is an important element causing such metabolic inflammation, and intestinal flora is considered a major source of systemic LPS. We studied changes of intestinal microbiota associated with high-fat diet (HFD) that causes insulin resistance and metabolic stress. 16S rRNA gene sequencing showed that HFD significantly decreased the abundance of a mucin-degrading bacterium Akkermansia muciniphila compared to control diet...
September 2016: Journal of Hypertension
https://www.readbyqxmd.com/read/27635781/insulin-sensitivity-enhancing-activity-of-phlorizin-is-associated-with-lipopolysaccharide-decrease-and-gut-microbiota-changes-in-obese-and-type-2-diabetes-db-db-mice
#13
Xueran Mei, Xiaoyu Zhang, Zhanguo Wang, Ziyang Gao, Gang Liu, Huiling Hu, Liang Zou, Xueli Li
Phlorizin exists in a number of fruits and foods and exhibits many bioactivities. The mechanism of its antidiabetic effect has been known as it can competitively inhibit sodium-glucose symporters (SGLTs). However, phlorizin has a wide range of two-phase metabolism in systemic circulation and shows poor oral bioavailability. An alternative mechanism may involve gut microbiota in intestine. Sixteen obese mice with type 2 diabetes (db/db) and eight age-matched control mice (db/+) were divided into three groups: diabetic group treated with phlorizin (DMT group), vehicle-treated diabetic group (DM group), and normal control group (CC group)...
October 12, 2016: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/27622378/assessment-of-fecal-microbiota-and-fecal-metabolome-in-symptomatic-uncomplicated-diverticular-disease-of-the-colon
#14
Antonio Tursi, Paola Mastromarino, Daniela Capobianco, Walter Elisei, Alfredo Miccheli, Giorgio Capuani, Alberta Tomassini, Giuseppe Campagna, Marcello Picchio, GianMarco Giorgetti, Federica Fabiocchi, Giovanni Brandimarte
GOAL: The aim of this study was to assess fecal microbiota and metabolome in a population with symptomatic uncomplicated diverticular disease (SUDD). BACKGROUND: Whether intestinal microbiota and metabolic profiling may be altered in patients with SUDD is unknown. PATIENTS AND METHODS: Stool samples from 44 consecutive women [15 patients with SUDD, 13 with asymptomatic diverticulosis (AD), and 16 healthy controls (HCs)] were analyzed. Real-time polymerase chain reaction was used to quantify targeted microorganisms...
October 2016: Journal of Clinical Gastroenterology
https://www.readbyqxmd.com/read/27594980/ketogenic-diet-modifies-the-gut-microbiota-in-a-murine-model-of-autism-spectrum-disorder
#15
Christopher Newell, Marc R Bomhof, Raylene A Reimer, Dustin S Hittel, Jong M Rho, Jane Shearer
BACKGROUND: Gastrointestinal dysfunction and gut microbial composition disturbances have been widely reported in autism spectrum disorder (ASD). This study examines whether gut microbiome disturbances are present in the BTBR(T + tf/j) (BTBR) mouse model of ASD and if the ketogenic diet, a diet previously shown to elicit therapeutic benefit in this mouse model, is capable of altering the profile. FINDINGS: Juvenile male C57BL/6 (B6) and BTBR mice were fed a standard chow (CH, 13 % kcal fat) or ketogenic diet (KD, 75 % kcal fat) for 10-14 days...
2016: Molecular Autism
https://www.readbyqxmd.com/read/27577947/gut-microbiota-of-obese-type-2-diabetic-individuals-is-enriched-in-faecalibacterium-prausnitzii-akkermansia-muciniphila-and-peptostreptococcus-anaerobius-after-weight-loss
#16
Marlene Remely, Berit Hippe, Julia Zanner, Eva Aumueller, Helmuth Brath, Alexander G Haslberger
Beside the influence of nutritional habits and reduced physical activity, metabolic syndrome is associated with alterations in the structure of gut microbiota influencing the inflammatory immune responses. Gut microbiota and microbial metabolic activities are known to affect the lipid and glucose metabolism, satiety and chronic low-grade inflammation in the metabolic syndrome. The aim of the study was to identify genera or even species affecting host metabolism in obesity and type 2 diabetes beside the commonly used indicator: Firmicutes/Bacteroidetes ratio...
August 30, 2016: Endocrine, Metabolic & Immune Disorders Drug Targets
https://www.readbyqxmd.com/read/27571978/the-microenvironment-of-injured-murine-gut-elicits-a-local-pro-restitutive-microbiota
#17
Ashfaqul Alam, Giovanna Leoni, Miguel Quiros, Huixia Wu, Chirayu Desai, Hikaru Nishio, Rheinallt M Jones, Asma Nusrat, Andrew S Neish
The mammalian intestine houses a complex microbial community, which influences normal epithelial growth and development, and is integral to the repair of damaged intestinal mucosa(1-3). Restitution of injured mucosa involves the recruitment of immune cells, epithelial migration and proliferation(4,5). Although microenvironmental alterations have been described in wound healing(6), a role for extrinsic influences, such as members of the microbiota, has not been reported. Here, we show that a distinct subpopulation of the normal mucosal-associated gut microbiota expands and preferentially colonizes sites of damaged murine mucosa in response to local environmental cues...
January 27, 2016: Nature Microbiology
https://www.readbyqxmd.com/read/27569192/consumption-of-a-high-fat-diet-alters-the-seminal-fluid-and-gut-microbiomes-in-male-mice
#18
Angela B Javurek, William G Spollen, Sarah A Johnson, Nathan J Bivens, Karen H Bromert, Scott A Givan, Cheryl S Rosenfeld
Our prior work showed that a novel microbiome resides in the seminal vesicles of wild-type and oestrogen receptor α (Esr1) knock-out mice and is impacted by the presence of functional Esr1 genes. The seminal fluid microbiome (SFM) may influence the health and reproductive status of the male, along with that of his partner and offspring. A high-fat diet (HFD) alters metabolites and other factors within seminal fluid and might affect the SFM. Adult (~15 weeks old) male mice were placed for 4 weeks on a control or high-fat diet and seminal fluid and fecal samples were collected, bacterial DNA isolated and subjected to 16s rRNA sequencing...
August 29, 2016: Reproduction, Fertility, and Development
https://www.readbyqxmd.com/read/27507967/characterization-of-outer-membrane-proteome-of-akkermansia-muciniphila-reveals-sets-of-novel-proteins-exposed-to-the-human-intestine
#19
Noora Ottman, Laura Huuskonen, Justus Reunanen, Sjef Boeren, Judith Klievink, Hauke Smidt, Clara Belzer, Willem M de Vos
Akkermansia muciniphila is a common member of the human gut microbiota and belongs to the Planctomycetes-Verrucomicrobia-Chlamydiae superphylum. Decreased levels of A. muciniphila have been associated with many diseases, and thus it is considered to be a beneficial resident of the intestinal mucus layer. Surface-exposed molecules produced by this organism likely play important roles in colonization and communication with other microbes and the host, but the protein composition of the outer membrane (OM) has not been characterized thus far...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27499019/akkermansia-glycaniphila-sp-nov-an-anaerobic-mucin-degrading-bacterium-isolated-from-reticulated-python-faeces
#20
Janneke P Ouwerkerk, Steven Aalvink, Clara Belzer, Willem M de Vos
A Gram-negative, non-motile, strictly anaerobic, oval-shaped, non-spore-forming bacterium was isolated from reticulated python faeces. Strain PytT was capable of using mucin as sole carbon, energy and nitrogen source. Cells could grow singly, in pairs, and were also found to aggregate. Scanning electron microscopy revealed the presence of filamentous structures connecting individual bacterial cells. Strain PytT could grow on a limited number of single sugars, including N-acetylglucosamine, N-acetylgalactosamine, glucose, lactose and galactose, but only when a plentiful protein source was provided...
August 5, 2016: International Journal of Systematic and Evolutionary Microbiology
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