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Gut Microbes

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https://www.readbyqxmd.com/read/28165863/dietary-fiber-and-prebiotics-and-the-gastrointestinal-microbiota
#1
Hannah D Holscher
The gastrointestinal microbiota has an important role in human health, and there is increasing interest in utilizing dietary approaches to modulate the composition and metabolic function of the microbial communities that colonize the gastrointestinal tract to improve health, and prevent or treat disease. One dietary strategy for modulating the microbiota is consumption of dietary fiber and prebiotics that can be metabolized by microbes in the gastrointestinal tract. Human alimentary enzymes are not able to digest most complex carbohydrates and plant polysaccharides...
February 6, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28156183/listeriolysin-s-a-bacteriocin-from-epidemic-listeria-monocytogenes-strains-that-targets-the-microbiota
#2
Juan-José Quereda-Torres, Jazmín Meza-Torres, Pascale Cossart, Javier Pizarro-Cerdá
Listeria monocytogenes is a Gram-positive food-borne pathogen that in humans may traverse the intestinal, placental and blood/brain barriers, causing gastroenteritis, abortions and meningitis. Crossing of these barriers is dependent on the bacterial ability to enter host cells, and several L. monocytogenes surface and secreted virulence factors are known to facilitate entry and the intracellular lifecycle. The study of L. monocytogenes strains associated to human listeriosis epidemics has revealed the presence of novel virulence factors...
February 3, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28129018/challenges-in-fecal-donor-selection-and-screening-for-fecal-microbiota-transplantation-a-review
#3
Michael H Woodworth, Cynthia Carpentieri, Kaitlin L Sitchenko, Colleen S Kraft
Fecal microbiota transplantation is best understood as an effective and inexpensive therapy for recurrent Clostridium difficile infection but fecal donor selection and screening should be periodically revised. Here, we review current recommendations for selection and screening of fecal donors for fecal microbiota transplantation. We recommend considering diabetes mellitus, prior cardiovascular events, and clinical healthcare exposure as fecal donor exclusion criteria until more is known about the association of these conditions with the human gut microbiome...
January 27, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28129014/biochemical-basis-for-activation-of-virulence-genes-by-bile-salts-in-vibrio-parahaemolyticus
#4
Giomar Rivera-Cancel, Kim Orth
Bile salts act as a stressor to bacteria that transit the intestinal tract. Enteric pathogens have hijacked bile as an intestinal signal to regulate virulence factors. We recently demonstrated that Vibrio parahemolyticus senses bile salts via a heterodimeric receptor formed by the periplasmic domains of inner-membrane proteins VtrA and VtrC. Crystal structures of the periplasmic complex reveal that VtrA and VtrC form a β-barrel that binds bile salts in its hydrophobic interior to activate the VtrA cytoplasmic DNA-binding domain...
January 27, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28118083/the-influence-of-proton-pump-inhibitors-and-other-commonly-used-medication-on-the-gut-microbiota
#5
Floris Imhann, Arnau Vich Vila, Marc Jan Bonder, Ailine G Lopez Manosalva, Debby P Y Koonen, Jingyuan Fu, Cisca Wijmenga, Alexandra Zhernakova, Rinse K Weersma
Proton pump inhibitors (PPIs), used to treat gastro-esophageal reflux and prevent gastric ulcers, are among the most widely used drugs in the world. The use of PPIs is associated with an increased risk of enteric infections. Since the gut microbiota can, depending on composition, increase or decrease the risk of enteric infections, we investigated the effect of PPI-use on the gut microbiota. We discovered profound differences in the gut microbiota of PPI users: 20% of their bacterial taxa were statistically significantly altered compared with those of non-users...
January 24, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28112583/the-gut-microbiota-of-siblings-offers-insights-into-microbial-pathogenesis-of-inflammatory-bowel-disease
#6
Charlotte R Hedin, Christopher J van der Gast, Andrew J Stagg, James O Lindsay, Kevin Whelan
Siblings of patients with Crohn's disease (CD) have elevated risk of developing CD and display aspects of disease phenotype, including faecal dysbiosis. In our recent article we have used 16S rRNA gene targeted high-throughput sequencing to comprehensively characterize the mucosal microbiota in healthy siblings of CD patients, and determine the influence of genotypic and phenotypic factors on the gut microbiota (dysbiosis). We have demonstrated that the core microbiota of both patients with CD and healthy siblings is significantly less diverse than controls...
January 23, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28103145/can-you-cause-inflammatory-bowel-disease-with-fecal-transplantation-a-31-patient-case-series-of-fecal-transplantation-using-stool-from-a-donor-who-later-developed-crohn-s-disease
#7
Monika Fischer, Mohamad Bittar, Eliseo Papa, Zain Kassam, Mark Smith
No abstract text is available yet for this article.
January 19, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28102757/dysbiosis-in-crohn-s-disease-joint-action-of-stochastic-injuries-and-focal-inflammation-in-the-gut
#8
Ludovica F Buttó, Dirk Haller
Gut homeostasis involves interrelated biological networks that include the immune system, specialized cells of the epithelium, such as Paneth and goblet cells, as well as triggers derived from the microbiota. Disruption of these homeostatic interactions may lead to the pathogenesis of inflammatory bowel diseases (IBD). To develop more targeted and individual treatments in Crohn's disease and ulcerative colitis, it becomes more and more important to link key mechanisms of the disease pathogenesis to distinct IBD subsets...
January 19, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28102756/treatment-of-recurrent-clostridium-difficile-infection-using-fecal-microbiota-transplantation-in-patients-with-inflammatory-bowel-disease
#9
Krista M Newman, Kevin M Rank, Byron P Vaughn, Alexander Khoruts
We recently compared results of fecal microbiota transplantation (FMT) in patients with refractory, recurrent Clostridium difficile infection (rCDI), with and without underlying inflammatory bowel disease (IBD). Here we extend this cohort and analyze outcomes in greater detail by subtype of IBD. We find that FMT is generally effective in breaking the cycle of CDI recurrence, but its effects on overall IBD progression are much less predictable. We discuss several challenges intrinsic to this complex clinical situation and outline the next steps that can address these challenges going forward...
January 19, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28080213/campylobacter-jejuni-transducer-like-proteins-chemotaxis-and-beyond
#10
Kshipra Chandrashekhar, Issmat I Kassem, Gireesh Rajashekara
Chemotaxis, a process that mediates directional motility toward or away from chemical stimuli (chemoeffectors/ligands that can be attractants or repellents) in the environment, plays an important role in the adaptation of Campylobacter jejuni to disparate niches. The chemotaxis system consists of core signal transduction proteins and methyl-accepting-domain-containing Transducer like proteins (Tlps). Ligands binding to Tlps relay a signal to chemotaxis proteins in the cytoplasm which initiate a signal transduction cascade, culminating into a directional flagellar movement...
January 12, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28080210/pathogen-control-at-the-intestinal-mucosa-h2o2-to-the-rescue
#11
Ulla G Knaus, Rosanne Hertzberger, Gratiela G Pircalabioru, S Parsa M Yousefi, Filipe Branco Dos Santos
Intestinal infections are a global challenge, connected to malnutrition and inadequate hygiene in developing countries, and to expanding antibiotic resistance in developed countries. In general, a healthy host is capable of fighting off gut pathogens or at least to recover from infections quickly. The underlying protective mechanism, termed colonization resistance, is provided by indigenous commensal communities (microbiota) that are shaped and aided by the host's epithelial and innate immune system. Commensal-pathogen interactions are governed by competition for a suitable niche for replication and stable colonization, nutrient availability, species-specific alterations of the metabolic environment, changes in oxygen tension and release of chemicals and proteinaceous toxins (bacteriocins)...
January 12, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28080206/gut-microbes-manuscript-type-commentary-and-views-submission-probiotics-d-lactic-acidosis-oxidative-stress-and-strain-specificity
#12
Luis Vitetta, Samantha Coulson, Michael Thomsen, Tony Nguyen, Sean Hall
The existence of an implicit living microscopic world, composed primarily of bacteria, has been known for centuries. The exact mechanisms that govern the contribution of bacteria to human health and disease have only recently become the subject of intense research efforts. Within this very evident shift in paradigms, the rational design of probiotic formulations has led to the creation of an industry that seeks to progress the engineering of probiotic bacteria that produce metabolites that may enhance human host health and prevent disease...
January 12, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28068209/the-role-of-early-life-nutrition-in-the-establishment-of-gastrointestinal-microbial-composition-and-function
#13
Erin C Davis, Mei Wang, Sharon M Donovan
The development of the human infant intestinal microbiota is a sequential process that begins in utero and continues during the first 2 to 3 years of life. Microbial composition and diversity are shaped by host genetics and multiple environmental factors, of which diet is a principal contributor. An understanding of this process is of clinical importance as the microbiota acquired in early life influence gastrointestinal, immune and neural development, and reduced microbial diversity or dysbiosis during infancy is associated with disorders in infancy and later childhood...
January 9, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28059614/western-diets-gut-dysbiosis-and-metabolic-diseases-are-they-linked
#14
Kristina B Martinez, Vanessa Leone, Eugene B Chang
Obesity afflicts 36.5% of the US population and 600 million individuals world-wide. Thus, it is imperative to understand the risk factors underlying metabolic disease including diet, activity level, sleep, and genetics. Another key contributory factor is the gut microbiota given its widely reported role in the development of metabolic disease. The gut microbiota, particularly its structure and function, is heavily influenced by Western style diets rich in a complex mixture of fats and high in simple sugars...
January 6, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28059612/fecal-microbial-transplantation-as-a-therapeutic-option-in-patients-colonized-with-antibiotic-resistant-organisms
#15
Michael Laffin, Braden Millan, Karen L Madsen
Despite increasing interest in fecal microbiota transplantation (FMT), its full therapeutic potential has yet to be determined. Since its increase in popularity, FMT has been shown to be highly effective in the treatment of both Clostridium difficile infection (CDI) and its recurrent form. Interest in FMT now expands well beyond the treatment of CDI to other processes with known associations to the microbiota such as antibiotic resistant infections, inflammatory bowel disease (IBD), hepatic encephalopathy, neuropsychiatric disorders, and metabolic disease...
January 6, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28051919/analysis-of-gut-microbiota-an-ever-changing-landscape
#16
Michael J Sadowsky, Christopher Staley, Cheryl Heiner, Richard Hall, Colleen R Kelly, Lawrence Brandt, Alexander Khoruts
In the last two decades, the field of metagenomics has greatly expanded due to improvement in sequencing technologies allowing for a more comprehensive characterization of microbial communities. The use of these technologies has led to an unprecedented understanding of human, animal, and environmental microbiomes and have shown that the gut microbiota are comparable to an organ that is intrinsically linked with a variety of diseases. Characterization of microbial communities using next-generation sequencing-by-synthesis approaches have revealed important shifts in microbiota associated with debilitating diseases such as Clostridium difficile infection...
January 4, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28001467/fecal-microbiota-transplant-in-severe-and-severe-complicated-clostridium-difficile-a-promising-treatment-approach
#17
Monika Fischer, Brian Sipe, Yao-Wen Cheng, Emmalee Phelps, Nicholas Rogers, Sashidhar Sagi, Matthew Bohm, Huiping Xu, Zain Kassam
Severe and severe-complicated Clostridium difficile infection (CDI) is associated with high morbidity and mortality. Colectomy is standard of care; however, post-surgical mortality rates approach 50%. Case reports suggest fecal microbiota transplant (FMT) is a promising treatment of severe and severe-complicated disease but there is a paucity of data. Here, we present a single center experience with a novel sequential FMT protocol for patients refractory to maximal medical therapy. This approach consists of at least one FMT delivered via colonoscopy with criteria for repeat FMT and continued vancomycin therapy based on clinical response and pseudomembranes...
December 21, 2016: Gut Microbes
https://www.readbyqxmd.com/read/27973989/prospective-randomized-controlled-study-on-the-effects-of-saccharomyces-boulardii-cncm-i-745-and-amoxicillin-clavulanate-or-the-combination-on-the-gut-microbiota-of-healthy-volunteers
#18
Toufic A Kabbani, Kumar Pallav, Scot E Dowd, Javier Villafuerte-Galvez, Rohini R Vanga, Natalia E Castillo, Joshua Hansen, Melinda Dennis, Daniel A Leffler, Ciarán P Kelly
Probiotics are believed to be beneficial in maintaining a healthy gut microbiota whereas antibiotics are known to induce dysbiosis. This study aimed to examine the effects of the probiotic Saccharomyces boulardii CNCM I-745 (SB), the antibiotic Amoxicillin-Clavulanate (AC) and the combination on the microbiota and symptoms of healthy humans. Healthy subjects were randomized to one of 4 study groups: SB for 14 days, AC for 7 days, SB plus AC, Control (no treatment). Participants gave stool samples and completed gastro-intestinal symptom questionnaires...
December 14, 2016: Gut Microbes
https://www.readbyqxmd.com/read/27960648/linking-dietary-patterns-with-gut-microbial-composition-and-function
#19
Amy M Sheflin, Christopher L Melby, Franck Carbonero, Tiffany L Weir
 Emerging insights have implicated the gut microbiota as an important factor in the maintenance of human health. Although nutrition research has focused on how direct interactions between dietary components and host systems influence human health, it is becoming increasingly important to consider nutrient effects on the gut microbiome for a more complete picture. Understanding nutrient-host-microbiome interactions promises to reveal novel mechanisms of disease etiology and progression, offers new disease prevention strategies and therapeutic possibilities, and may mandate alternative criteria to evaluate the safety of food ingredients...
December 14, 2016: Gut Microbes
https://www.readbyqxmd.com/read/27935413/stable-core-virome-despite-variable-microbiome-after-fecal-transfer
#20
Felix Broecker, Giancarlo Russo, Jochen Klumpp, Karin Moelling
We recently described the 4.5-year time course of the enteric bacterial microbiota and virome of a patient cured from recurrent Clostridium difficile infection (rCDI) by fecal microbiota transplantation (FMT). Here, we extended the virome analyses and found the patient's phage population to exhibit highly donor-similar characteristics following FMT, which remained stable for the whole period tested (up to 7 months). Moreover, the detected viral populations of donor and patient exhibited comparable diversity and richness...
December 9, 2016: Gut Microbes
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