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Gut Microbes

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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
#1
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
#2
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
#3
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 a number of 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
#4
Kshipra Chandrashekhar, Issmat I Kassem, Gireesh Rajashekara
Chemotaxis, a process that mediates directional motility towards 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
#5
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. (1) 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/probiotics-d-lactic-acidosis-oxidative-stress-and-strain-specificity
#6
Luis Vitetta, Samantha Coulson, Michael Thomsen, Tony Nguyen, Sean Hall
1. 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
#7
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/28059627/structural-and-functional-alterations-in-the-colonic-microbiome-of-the-rat-in-a-model-of-stress-induced-irritable-bowel-syndrome
#8
Nicolaas H Fourie, Dan Wang, Sarah K Abey, Amy L Creekmore, Shuangsong Hong, Christiana G Martin, John W Wiley, Wendy A Henderson
Stress is known to perturb the microbiome and exacerbate irritable bowel syndrome (IBS) associated symptoms. Characterizing structural and functional changes in the microbiome is necessary to understand how alterations affect the biomolecular environment of the gut in IBS. Repeated water avoidance (WA) stress was used to induce IBS-like symptoms in rats. The colon-mucosa associated microbiome was characterized in 13 stressed and control animals by 16S sequencing. In silico analysis of the functional domains of microbial communities was done by inferring metagenomic profiles from 16S data...
January 6, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28059614/western-diets-gut-dysbiosis-and-metabolic-diseases-are-they-linked
#9
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
#10
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
#11
Michael J Sadowsky, Christopher Staley, Cheryl Heiner, Richard Hall, Colleen R Kelly, Lawrence Brandt, Alexander Khoruts
No abstract text is available yet for this article.
January 4, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28045579/gut-microbiota-as-a-source-of-a-surrogate-antigen-that-triggers-autoimmunity-in-an-immune-privileged-site
#12
Carlos R Zárate-Bladés, Reiko Horai, Mary J Mattapallil, Nadim J Ajami, Matthew Wong, Joseph F Petrosino, Kikuji Itoh, Chi-Chao Chan, Rachel R Caspi
Recent discoveries on the role of commensal microbiota have significantly changed our understanding of human physiology. The host-microbiota interplay is now an important aspect to take into account to understand immune responses and immunological diseases. Autoimmune uveitis is a sight-threatening disease that arises without a known infectious etiology. It is unknown where and how autoreactive T cells become primed to trigger disease in the eye, which is an immune privileged site. We recently reported data supporting the notion that retina-specific T cells receive a signal in the gut from commensal microbiota-derived cross-reactive antigen(s) and trigger autoimmune uveitis in the R161H mouse model...
January 3, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28001467/fecal-microbiota-transplant-in-severe-and-severe-complicated-clostridium-difficile-a-promising-treatment-approach
#13
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
#14
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 four 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
#15
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
#16
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
https://www.readbyqxmd.com/read/27918230/mechanisms-of-cross-talk-between-the-diet-the-intestinal-microbiome-and-the-undernourished-host
#17
Helene Velly, Robert A Britton, Geoffrey A Preidis
Undernutrition remains one of the most pressing global health challenges today, contributing to nearly half of all deaths in children under five years of age. Although insufficient dietary intake and environmental enteric dysfunction are often inciting factors, evidence now suggests that unhealthy gut microbial populations perpetuate the vicious cycle of pathophysiology that results in persistent growth impairment in children. The metagenomics era has facilitated new research identifying an altered microbiome in undernourished hosts and has provided insight into a number of mechanisms by which these alterations may affect growth...
December 5, 2016: Gut Microbes
https://www.readbyqxmd.com/read/27874308/microbial-metabolomic-and-immunologic-dynamics-in-a-relapsing-genetic-mouse-model-of-colitis-induced-by-t-synthase-deficiency
#18
Jonathan P Jacobs, Lin Lin, Maryam Goudarzi, Paul Ruegger, Dermot P B McGovern, Albert J Fornace, James Borneman, Lijun Xia, Jonathan Braun
Intestinal dysbiosis is thought to confer susceptibility to inflammatory bowel disease (IBD), but it is unknown whether dynamic changes in the microbiome contribute to fluctuations in disease activity. We explored this question using mice with intestine-specific deletion of C1galt1 (also known as T-synthase) (Tsyn mice). These mice develop spontaneous microbiota-dependent colitis with a remitting/relapsing course due to loss of mucin core-1 derived O-glycans. 16S rRNA sequencing and untargeted metabolomics demonstrated age-specific perturbations in the intestinal microbiome and metabolome of Tsyn mice compare with littermate controls at weeks 3 (disease onset), 5 (during remission), and 9 (after relapse)...
November 22, 2016: Gut Microbes
https://www.readbyqxmd.com/read/27808595/nutrition-and-the-gut-microbiome-in-the-elderly
#19
Nuria Salazar, Lorena Valdés-Varela, Sonia González, Miguel Gueimonde, Clara G de Los Reyes-Gavilán
The gut microbiota is the assembly of microorganisms living in our intestine and their genomes are known as the microbiome. The correct composition and functionality of this microbiome is essential for maintaining a "healthy status." Aging is related to changes in the gut microbiota which are frequently associated with physiological modifications of the gastrointestinal tract, as well as, to changes in dietary patterns, together with a concomitant decline in cognitive and immune function, all together contributing to frailty...
November 3, 2016: Gut Microbes
https://www.readbyqxmd.com/read/27808584/support-for-the-microgenderome-invites-enquiry-into-sex-differences
#20
Amy Wallis, Henry Butt, Michelle Ball, Donald P Lewis, Dorothy Bruck
The microgenderome defines the interaction between microbiota, sex hormones and the immune system. Our recent research inferred support for the microgenderome by showing sex differences in microbiota-symptom associations in a clinical sample of patients with myalgic encephalomyelitis / chronic fatigue syndrome (ME/CFS). This addendum expands upon the sex-specific pattern of associations that were observed. Interpretations are hypothesized in relation to genera versus species-level analyses and D-lactate theory...
November 3, 2016: Gut Microbes
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