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https://www.readbyqxmd.com/read/29333111/diet-gut-microbiota-and-colorectal-cancer-prevention-a-review-of-potential-mechanisms-and-promising-targets-for-future-research
#1
Mingyang Song, Andrew T Chan
Diet plays an important role in the development of colorectal cancer. Emerging data have implicated the gut microbiota in colorectal cancer. Diet is a major determinant for the gut microbial structure and function. Therefore, it has been hypothesized that alterations in gut microbes and their metabolites may contribute to the influence of diet on the development of colorectal cancer. We review several major dietary factors that have been linked to gut microbiota and colorectal cancer, including major dietary patterns, fiber, red meat and sulfur, and obesity...
December 2017: Current Colorectal Cancer Reports
https://www.readbyqxmd.com/read/29332637/pilot-rct-of-an-integrative-group-therapy-for-patients-with-refractory-irritable-bowel-syndrome-isrctn02977330
#2
S Berens, E Stroe-Kunold, F Kraus, J Tesarz, A Gauss, B Niesler, W Herzog, R Schaefert
OBJECTIVE: Different forms of psychotherapeutic treatments have been proven effective in irritable bowel syndrome (IBS), but disorder-oriented and integrative concepts are still rare. Therefore, we implemented and evaluated an integrative group therapeutic concept within an interdisciplinary tertiary care clinic for functional gastrointestinal disorders (FGIDs). AIMS: present our integrative group concept, assess feasibility issues, and evaluate efficacy. METHODS: A pilot-RCT with a randomized controlled wait-listed group design was conducted...
February 2018: Journal of Psychosomatic Research
https://www.readbyqxmd.com/read/29331731/deoxynivalenol-gut-microbiota-and-immunotoxicity-a-potential-approach
#3
REVIEW
Yuxiao Liao, Zhao Peng, Liangkai Chen, Andreas K Nüssler, Liegang Liu, Wei Yang
Deoxynivalenol (DON, vomitoxin) is the most frequent mycotoxin in grains and grain products. DON contamination in fodder and food is a serious threat for health, since it impairs the immune and gastrointestinal systems of both human and animals. Gut microbiota seems to play a more and more important part in human and animals' health according to related researches. Previous studies implied some associations among gut microbiota, DON and immune system. For example, DON affects immune system as well as the composition and abundance of gut microbiota, and the latter influences immune system as well...
January 10, 2018: Food and Chemical Toxicology
https://www.readbyqxmd.com/read/29331526/valerate-production-by-megasphaera-elsdenii-isolated-from-pig-feces
#4
Shota Yoshikawa, Ryosuke Araoka, Yu Kajihara, Toshiyuki Ito, Hirokuni Miyamoto, Hiroaki Kodama
Megasphaera elsdenii is able to produce several short-chain fatty acids (SCFAs), such as acetate, propionate, butyrate, and valerate. These SCFAs serve as an energy source for host animals and play an important role in gut health. In this study, M. elsdenii was isolated from pig feces that had been collected from two farms located in distinct areas of Japan. These M. elsdenii isolates were genotyped, and 7 representative strains were selected. When these 7 strains and M. elsdenii JCM 1772T were cultured with lactate for 24 h, all 7 strains produced valerate as a predominant SCFA...
January 11, 2018: Journal of Bioscience and Bioengineering
https://www.readbyqxmd.com/read/29330189/targeted-synthesis-and-characterization-of-a-gene-cluster-encoding-nad-p-h-dependent-3%C3%AE-3%C3%AE-and-12%C3%AE-hydroxysteroid-dehydrogenases-from-eggerthella-cag-298-a-gut-metagenomic-sequence
#5
Sean M Mythen, Saravanan Devendran, Celia Méndez-García, Isaac Cann, Jason M Ridlon
Gut metagenomic sequences provide a rich source of microbial genes, the majority of which are annotated by homology or unknown. Genes and gene pathways that encode enzymes catalyzing biotransformation of host bile acids are important to identify in gut metagenomic sequences due to the importance of bile acids on gut microbiome structure and host physiology. Hydroxysteroid dehydrogenases (HSDH) are pyridine nucleotide-dependent enzymes with stereo-specificity and regio-specificity for bile acid and steroid hydroxyl groups...
January 12, 2018: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29327435/impact-of-dietary-induced-precocious-gut-maturation-on-cecal-microbiota-and-its-relation-to-the-blood-brain-barrier-during-the-postnatal-period-in-rats
#6
N Marungruang, E Arévalo Sureda, A Lefrançoise, B Weström, M Nyman, O Prykhodko, F Fåk Hållenius
BACKGROUND: Precocious maturation of the gastrointestinal barrier (GIB) in newborn mammals can be induced by dietary provocation, but how this affects the gut microbiota and the gut-brain axis remains unknown. The objective of this study was to investigate effects of induced GIB maturation on gut microbiota composition and blood-brain barrier (BBB) permeability. METHODS: Suckling rats were studied at 72 h after gavage with phytohemagglutinin (PHA) or microbial protease (PT) to induce maturation of GIB...
January 12, 2018: Neurogastroenterology and Motility: the Official Journal of the European Gastrointestinal Motility Society
https://www.readbyqxmd.com/read/29322485/effects-of-ipragliflozin-on-postprandial-glucose-metabolism-and-gut-peptides-in-type-2-diabetes-a-pilot-study
#7
Hiroaki Ueno, Hiroko Nakazato, Emi Ebihara, Kenji Noma, Takahisa Kawano, Kazuhiro Nagamine, Hideyuki Sakoda, Masamitsu Nakazato
INTRODUCTION: Ipragliflozin is a novel antidiabetic drug that inhibits renal tubular sodium-glucose cotransporter-2 (SGLT2). The aim of this study was to evaluate the effects of ipragliflozin on glucose, insulin, glucagon, and gastrointestinal peptide responses to a meal tolerance test, as well as to investigate the glucose-lowering mechanisms of ipragliflozin. METHODS: Nine Japanese patients with obesity and type 2 diabetes mellitus were treated with ipragliflozin (50 mg/day) for 12 weeks...
January 10, 2018: Diabetes Therapy: Research, Treatment and Education of Diabetes and related Disorders
https://www.readbyqxmd.com/read/29322139/effects-of-polysaccharides-from-purple-sweet-potatoes-on-immune-response-and-gut-microbiota-composition-in-normal-and-cyclophosphamide-treated-mice
#8
Chao Tang, Jian Sun, Bo Zhou, Changhai Jin, Jun Liu, Juan Kan, Chunlu Qian, Nianfeng Zhang
In this study, three polysaccharides including water-soluble polysaccharide (WSP), dilute alkali-soluble polysaccharide (DASP) and concentrated alkali-soluble polysaccharide (CASP) were extracted from purple sweet potatoes and then administered to normal and cyclophosphamide (CTX) treated mice by gavage. The results showed that WSP and CASP could restore the spleen index and immune cytokine (IL-2 and IL-6) levels in CTX treated mice, while DASP could enhance the levels of TNF-α, IL-2 and IL-6. As compared to the normal control group, WSP and CASP treatment groups exhibited increased levels of Bacteroidetes, Lachnospiraceae and Oscillospira, but decreased levels of Firmicutes, Alcaligenaceae and Sutterella in normal mice...
January 11, 2018: Food & Function
https://www.readbyqxmd.com/read/29321189/gut-brain-signaling-in-energy-homeostasis-the-unexpected-role-of-microbiota-derived-succinate
#9
REVIEW
Filipe de Vadder, Gilles Mithieux
In the context of the obesity epidemic, dietary fibers that are found essentially in fruit and vegetables attract more and more attention, since they exert numerous metabolic benefits resulting in the moderation of body weight. Short-chain fatty acids, such as propionate and butyrate, produced through their fermentation by the intestinal microbiota, have long been thought to be the mediators of these benefits. In fact, propionate and butyrate were recently shown to activate intestinal gluconeogenesis, a function exerting metabolic benefits via its capacity of signaling to the brain by gastrointestinal nerves...
February 2018: Journal of Endocrinology
https://www.readbyqxmd.com/read/29317660/microbiota-derived-short-chain-fatty-acids-promote-histone-crotonylation-in-the-colon-through-histone-deacetylases
#10
Rachel Fellows, Jérémy Denizot, Claudia Stellato, Alessandro Cuomo, Payal Jain, Elena Stoyanova, Szabina Balázsi, Zoltán Hajnády, Anke Liebert, Juri Kazakevych, Hector Blackburn, Renan Oliveira Corrêa, José Luís Fachi, Fabio Takeo Sato, Willian R Ribeiro, Caroline Marcantonio Ferreira, Hélène Perée, Mariangela Spagnuolo, Raphaël Mattiuz, Csaba Matolcsi, Joana Guedes, Jonathan Clark, Marc Veldhoen, Tiziana Bonaldi, Marco Aurélio Ramirez Vinolo, Patrick Varga-Weisz
The recently discovered histone post-translational modification crotonylation connects cellular metabolism to gene regulation. Its regulation and tissue-specific functions are poorly understood. We characterize histone crotonylation in intestinal epithelia and find that histone H3 crotonylation at lysine 18 is a surprisingly abundant modification in the small intestine crypt and colon, and is linked to gene regulation. We show that this modification is highly dynamic and regulated during the cell cycle. We identify class I histone deacetylases, HDAC1, HDAC2, and HDAC3, as major executors of histone decrotonylation...
January 9, 2018: Nature Communications
https://www.readbyqxmd.com/read/29317508/spatiotemporally-heterogeneous-population-dynamics-of-gut-bacteria-inferred-from-fecal-time-series-data
#11
Hidetoshi Inamine, Stephen P Ellner, Peter D Newell, Yuan Luo, Nicolas Buchon, Angela E Douglas
A priority in gut microbiome research is to develop methods to investigate ecological processes shaping microbial populations in the host from readily accessible data, such as fecal samples. Here, we demonstrate that these processes can be inferred from the proportion of ingested microorganisms that is egested and their egestion time distribution, by using general mathematical models that link within-host processes to statistics from fecal time series. We apply this framework to Drosophila melanogaster and its gut bacterium Acetobacter tropicalis Specifically, we investigate changes in their interactions following ingestion of a food bolus containing bacteria in a set of treatments varying the following key parameters: the density of exogenous bacteria ingested by the flies (low/high) and the association status of the host (axenic or monoassociated with A...
January 9, 2018: MBio
https://www.readbyqxmd.com/read/29315779/trophic-transfer-of-cadmium-from-duckweed-lemna-minor-l-to-tilapia-oreochromis-mossambicus
#12
Yan Xue, Willie J G M Peijnenburg, Jin Huang, Dengjun Wang, Yan Jin
The transfer of the toxic heavy metal Cd from duckweed (Lemna minor L.) to the freshwater fish tilapia (Oreochromis mossambicus) was investigated. Concentrations of Cd in different chemical forms in duckweed and in different tissues (gut, edible muscle, and remnants) of tilapia, i.e., ethanol-extractable (FE ), HCl-extractable (FHCl ), and residual fractions (FR ) were quantified, and the bioaccumulation factors (BAF) of Cd in the tilapia body were calculated. Simple linear regression analysis was used to unravel the correlation and accumulation mechanisms of Cd along the short food chain...
January 5, 2018: Environmental Toxicology and Chemistry
https://www.readbyqxmd.com/read/29313353/simulated-digestion-and-fermentation-in-vitro-by-human-gut-microbiota-of-polysaccharides-from-bee-collected-pollen-of-chinese-wolfberry
#13
Wangting Zhou, Yamei Yan, Jia Mi, Hongcheng Zhang, Lu Lu, Qing Luo, Xiaoying Li, Xiaoxiong Zeng, Youlong Cao
Digestion and fermentation in vitro of polysaccharides from bee collected pollen of Chinese wolfberry (WBPPS) were investigated in the present study. It was found that WBPPS was mainly consisted of mannose, ribose, rhamnose, galacturonic acid, glucose, galactose, xylose and arabinose in a molar ratio of 0.38: 0.09: 0.17: 0.64: 0.22: 0.67: 0.08: 1.03, respectively. WBPPS was not affected by human saliva. The fraction A (molecular weight 1340 kDa) of WBPPS was not broken down in simulated gastric and small intestinal juices, while the small fraction B (molecular weight 523 kDa) of WBPPS was degraded...
January 9, 2018: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29313275/microbiome-immunomodulation-and-the-neuronal-system
#14
REVIEW
Eric Marietta, Irina Horwath, Veena Taneja
Vertebrates harbor both symbiotic and pathogenic bacteria on the body and various mucosal surfaces. Of these surfaces, the intestine has the most diverse composition. This composition is dependent upon various environmental and genetic factors, with diet exerting the maximum influence. Significant roles of the intestinal bacteria are to stimulate the development of a competent mucosal immune system and to maintain tolerance within the intestine. One manner in which this is achieved is by the establishment of epithelial integrity by microbiota found in healthy individuals (healthy microbiota); however, in the case of a disrupted intestinal microbiome (dysbiosis), which can be caused by various conditions, the epithelial integrity is compromised...
January 8, 2018: Neurotherapeutics: the Journal of the American Society for Experimental NeuroTherapeutics
https://www.readbyqxmd.com/read/29312822/effect-of-dark-sweet-cherry-powder-consumption-on-the-gut-microbiota-short-chain-fatty-acids-and-biomarkers-of-gut-health-in-obese-db-db-mice
#15
Jose F Garcia-Mazcorro, Nara N Lage, Susanne Mertens-Talcott, Stephen Talcott, Boon Chew, Scot E Dowd, Jorge R Kawas, Giuliana D Noratto
Cherries are fruits containing fiber and bioactive compounds (e.g., polyphenolics) with the potential of helping patients with diabetes and weight disorders, a phenomenon likely related to changes in the complex host-microbiota milieu. The objective of this study was to investigate the effect of cherry supplementation on the gut bacterial composition, concentrations of caecal short-chain fatty acids (SCFAs) and biomarkers of gut health using an in vivo model of obesity. Obese diabetic (db/db) mice received a supplemented diet with 10% cherry powder (supplemented mice, n = 12) for 12 weeks; obese (n = 10) and lean (n = 10) mice served as controls and received a standard diet without cherry...
2018: PeerJ
https://www.readbyqxmd.com/read/29311617/scfas-strongly-stimulate-pyy-production-in-human-enteroendocrine-cells
#16
P Larraufie, C Martin-Gallausiaux, N Lapaque, J Dore, F M Gribble, F Reimann, H M Blottiere
Peptide-YY (PYY) and Glucagon-Like Peptide-1 (GLP-1) play important roles in the regulation of food intake and insulin secretion, and are of translational interest in the field of obesity and diabetes. PYY production is highest in enteroendocrine cells located in the distal intestine, mirroring the sites where high concentrations of short chain fatty acids (SCFAs) are produced by gut microbiota. We show here that propionate and butyrate strongly increased expression of PYY but not GCG in human cell line and intestinal primary culture models...
January 8, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29310114/the-local-defender-and-functional-mediator-gut-microbiome
#17
Hang Yang, Zhijun Duan
BACKGROUND: The gut microbiome has been developing and making adaption all the time, which is consistent with their host from the initial colonization at birth or earlier. Emerging evidence is showing that dysbiosis is involved in various diseases associated with immune, metabolism, infection, nervous system, social behaviors, and psychopathology, etc., maybe via modulating gut barrier, microbiome-gut-brain axis, or some metabolites like short-chain fatty acids (SCFAs). SUMMARY: In the review, we will conclude the recent researches related to the influence of microbiome on local structure, function, regulation, metabolism of gut, and systematic modulation to the host, as well as some affective factors such as diet or antibiotics...
January 8, 2018: Digestion
https://www.readbyqxmd.com/read/29309257/the-slc22-transporter-family-a-paradigm-for-the-impact-of-drug-transporters-on-metabolic-pathways-signaling-and-disease
#18
Sanjay K Nigam
The SLC22 transporter family consists of more than two dozen members, which are expressed in the kidney, the liver, and other tissues. Evolutionary analysis indicates that SLC22 transporters fall into at least six subfamilies: OAT (organic anion transporter), OAT-like, OAT-related, OCT (organic cation transporter), OCTN (organic cation/carnitine transporter), and OCT/OCTN-related. Some-including OAT1 [SLC22A6 or NKT (novel kidney transporter)] and OAT3 (SLC22A8), as well as OCT1 (SLC22A1) and OCT2 (SLC22A2)-are widely studied drug transporters...
January 6, 2018: Annual Review of Pharmacology and Toxicology
https://www.readbyqxmd.com/read/29307992/fructo-oligosaccharide-intensifies-visceral-hypersensitivity-and-intestinal-inflammation-in-a-stress-induced-irritable-bowel-syndrome-mouse-model
#19
Bin-Rui Chen, Li-Jun Du, Hui-Qin He, John J Kim, Yan Zhao, Ya-Wen Zhang, Liang Luo, Ning Dai
AIM: To determine whether fructo-oligosaccharide (FOS) affects visceral sensitivity, inflammation, and production of intestinal short-chain fatty acids (SCFA) in an irritable bowel syndrome (IBS) mouse model. METHODS: Mice were randomly assigned to daily oral gavage of saline solution with or without FOS (8 g/kg body weight) for 14 d. Mice were further assigned to receive either daily one-hour water avoidance stress (WAS) or sham-WAS for the first 10 d. After 2 wk, visceral sensitivity was measured by abdominal withdrawal reflex in response to colorectal distension and mucosal inflammation was evaluated...
December 21, 2017: World Journal of Gastroenterology: WJG
https://www.readbyqxmd.com/read/29307889/microbial-modulation-of-cardiovascular-disease
#20
REVIEW
J Mark Brown, Stanley L Hazen
Although diet has long been known to contribute to the pathogenesis of cardiovascular disease (CVD), research over the past decade has revealed an unexpected interplay between nutrient intake, gut microbial metabolism and the host to modify the risk of developing CVD. Microbial-associated molecular patterns are sensed by host pattern recognition receptors and have been suggested to drive CVD pathogenesis. In addition, the host microbiota produces various metabolites, such as trimethylamine-N-oxide, short-chain fatty acids and secondary bile acids, that affect CVD pathogenesis...
January 8, 2018: Nature Reviews. Microbiology
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