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Microbiome or microbiota or commensal

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https://www.readbyqxmd.com/read/28335507/hydroxytyrosol-in-the-prevention-of-the-metabolic-syndrome-and-related-disorders
#1
REVIEW
Julien Peyrol, Catherine Riva, Marie Josèphe Amiot
Virgin olive oil (VOO) constitutes the main source of fat in the Mediterranean diet. VOO is rich in oleic acid, displaying health-promoting properties, but also contains minor bioactive components, especially phenolic compounds. Hydroxytyrosol (HT), the main polyphenol of olive oil, has been reported to be the most bioactive component. This review aims to compile the results of clinical, animal and cell culture studies evaluating the effects of HT on the features of Metabolic Syndrome (MetS) (body weight/adiposity, dyslipidemia, hypertension, and hyperglycemia/insulin resistance) and associated complications (oxidative stress and inflammation)...
March 20, 2017: Nutrients
https://www.readbyqxmd.com/read/28334889/the-primary-transcriptome-of-neisseria-meningitidis-and-its-interaction-with-the-rna-chaperone-hfq
#2
Nadja Heidrich, Saskia Bauriedl, Lars Barquist, Lei Li, Christoph Schoen, Jörg Vogel
Neisseria meningitidis is a human commensal that can also cause life-threatening meningitis and septicemia. Despite growing evidence for RNA-based regulation in meningococci, their transcriptome structure and output of regulatory small RNAs (sRNAs) are incompletely understood. Using dRNA-seq, we have mapped at single-nucleotide resolution the primary transcriptome of N. meningitidis strain 8013. Annotation of 1625 transcriptional start sites defines transcription units for most protein-coding genes but also reveals a paucity of classical σ70-type promoters, suggesting the existence of activators that compensate for the lack of -35 consensus sequences in N...
March 17, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28334267/resistomap-online-visualization-of-human-gut-microbiota-antibiotic-resistome
#3
Konstantin S Yarygin, Boris A Kovarsky, Tatyana S Bibikova, Damir S Melnikov, Alexander V Tyakht, Dmitry G Alexeev
Summary: We created ResistoMap - a Web-based interactive visualization of the presence of genetic determinants conferring resistance to antibiotics, biocides and heavy metals in human gut microbiota. ResistoMap displays the data on more than 1500 published gut metagenomes of world populations including both healthy subjects and patients. Multiparameter display filters allow visual assessment of the associations between the meta-data and proportions of resistome. The geographic map navigation layer allows to state hypotheses regarding the global trends of antibiotic resistance and correlate the gut resistome variations with the national clinical guidelines on antibiotics application...
March 14, 2017: Bioinformatics
https://www.readbyqxmd.com/read/28334205/tetrahymena-phagocytic-vesicles-as-ecological-micro-niches-of-phage-transfer
#4
Iqbal Aijaz, Gerald B Koudelka
The microbial communities in natural environments such as soil, pond water, or animal rumens are comprised of a diverse mixture of bacteria and protozoa including ciliates or flagellates. In such microbiomes, a major source of bacterial mortality is grazing by phagocytic protists. Many protists are omnivorous heterotrophs, feeding on a range of different bacterial species. Due to this indiscriminate feeding, different bacterial species can assemble together in the same phagocytic vesicles where can they potentially exchange genetic material...
March 3, 2017: FEMS Microbiology Ecology
https://www.readbyqxmd.com/read/28334141/distribution-of-antimicrobial-resistance-determinants-virulence-associated-factors-and-crispr-loci-in-isolates-of-enterococcus-faecalis-from-various-settings-and-genetic-lineages
#5
Iwona Gawryszewska, Katarzyna Malinowska, Alicja Kuch, Dorota Chrobak-Chmiel, Lucja Laniewska-Trokenheim, Waleria Hryniewicz, Ewa Sadowy
Enterococcus faecalis represents an important factor of hospital-associated infections (HAIs). The knowledge on its evolution from a commensal to an opportunistic pathogen is still limited, thus we performed a study to characterize distribution of factors that may contribute to this adaptation. Using a collection obtained from various settings (hospitalized patients, community carriers, animals, fresh food, sewage, water) we investigated differences in antimicrobial susceptibility, distribution of antimicrobial resistance genes, virulence-associated determinants and phenotypes, and CRISPR loci in the context of the clonal relatedness of isolates...
March 1, 2017: Pathogens and Disease
https://www.readbyqxmd.com/read/28333867/determining-risk-of-severe-gastrointestinal-toxicity-based-on-pretreatment-gut-microbial-community-in-patients-receiving-cancer-treatment-a-new-predictive-strategy-in-the-quest-for-personalized-cancer-medicine
#6
Hannah R Wardill, Wim J E Tissing
PURPOSE OF REVIEW: Currently, our ability to accurately predict a patient's risk of developing severe gastrointestinal toxicity from their cancer treatment is limited. Risk stratification continues to rely on traditional patient-related and treatment-related factors including age, ethnicity, sex, comorbidities, genetics, agent, dose and schedule. Although informative, these crude measures continue to underestimate toxicity risk, and hence alternative methods of risk prediction must be investigated...
March 22, 2017: Current Opinion in Supportive and Palliative Care
https://www.readbyqxmd.com/read/28333760/antibiotic-associated-apoptotic-enterocolitis-in-the-absence-of-a-defined-pathogen-the-role-of-intestinal-microbiota-depletion
#7
Philipp Wurm, Walter Spindelboeck, Robert Krause, Johannes Plank, Gottfried Fuchs, Mina Bashir, Wolfgang Petritsch, Bettina Halwachs, Cord Langner, Christoph Högenauer, Gregor Gorkiewicz
OBJECTIVE: Antibiotic therapy is a major risk factor for the development of diarrhea and colitis with varying severity. Often the origin of antibiotic-associated gastrointestinal deterioration remains elusive and no specific infectious agents could be discerned. PATIENTS: We represent three cases of intractable high-volume diarrhea associated with combined antibiotic and steroid therapy in critically ill patients not fitting into established disease entities. Cases presented with severe apoptotic enterocolitis resembling acute intestinal graft-versus-host-disease...
March 22, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28333758/cutaneous-burn-injury-modulates-urinary-antimicrobial-peptide-responses-and-the-urinary-microbiome
#8
Jennifer K Plichta, Casey J Holmes, Vanessa Nienhouse, Michelle Puszynski, Xiang Gao, Qunfeng Dong, Huaiying Lin, James Sinacore, Michael Zilliox, Evelyn Toh, David E Nelson, Richard L Gamelli, Katherine A Radek
OBJECTIVES: Characterization of urinary bacterial microbiome and antimicrobial peptides after burn injury to identify potential mechanisms leading to urinary tract infections and associated morbidities in burn patients. DESIGN: Retrospective cohort study using human urine from control and burn subjects. SETTING: University research laboratory. PATIENTS: Burn patients. INTERVENTIONS: None. MEASUREMENTS AND MAIN RESULTS: Urine samples from catheterized burn patients were collected hourly for up to 40 hours...
March 22, 2017: Critical Care Medicine
https://www.readbyqxmd.com/read/28333693/pediatric-intestinal-failure-associated-liver-disease
#9
Cathleen M Courtney, Brad W Warner
PURPOSE OF REVIEW: The goal of this review is to provide updates on the definition, pathophysiology, treatment, and prevention of intestinal failure-associated liver disease (IFALD) that are relevant to care of pediatric patients. RECENT FINDINGS: Current literature emphasizes the multifactorial nature of IFALD. The pathogenesis is still largely unknown; however, molecular pathways have been identified. Key to these pathways are proinflammatory cytokines involved in hepatic inflammation and bile acids synthesis such as Toll-like receptor 4 and farnesoid X receptor, respectively...
March 22, 2017: Current Opinion in Pediatrics
https://www.readbyqxmd.com/read/28333444/host-symbiont-interaction-model-explains-non-monotonic-response-of-soybean-growth-and-seed-production-to-nano-ceo2-exposure
#10
Tin Klanjscek, Erik B Muller, Patricia A Holden, Roger M Nisbet
Recent nanotoxicity studies have demonstrated non-monotonic dose-response mechanisms for planted soybean that have a symbiotic relationship with bacteroids in their root nodules: reduction of growth and seed production was greater for low, as compared to high, exposures. To investigate mechanistic underpinnings of the observed patterns, we formulated an energy budget model coupled to a toxicokinetic module describing bioaccumulation, and two toxicodynamic modules describing respectively toxic effects on host plant and symbionts...
March 23, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28333360/gammadelta-t-cells-in-crohn-s-disease-a-new-player-in-the-disease-pathogenesis
#11
Catalan-Serra Ignacio, Arne Kristian Sandvik, Torunn Bruland, Juan Carlos Andreu-Ballester
Crohn's disease (CD) is a chronic relapsing systemic disease affecting the gastrointestinal tract. An altered immune response to commensal intestinal bacteria takes place in genetically predisposed individuals, resulting in chronic inflammation in the gut. Several alterations in the innate immunity mechanisms have been described in recent years. Thus, the study of the immunological aspects of CD, specifically the role of lymphocytes, is a key element for understanding the pathogenesis of the disease. Gammadelta T cells (γδ T cells) constitute only a small proportion of the lymphocytes that circulate in the blood and peripheral organs and they are present mainly in the epithelia, where they can constitute up to 40% of intraepithelial lymphocytes (IEL) in the intestinal mucosa...
March 16, 2017: Journal of Crohn's & Colitis
https://www.readbyqxmd.com/read/28333351/ecological-impact-of-ciprofloxacin-on-commensal-enterococci-in-healthy-volunteers
#12
Victoire de Lastours, Elena Maugy, Vincent Mathy, Françoise Chau, Benjamin Rossi, François Guérin, Vincent Cattoir, Bruno Fantin
Background: The ecological impact of ciprofloxacin on commensal enterococci is unknown. Methods: Forty-eight healthy volunteers received ciprofloxacin from day (D) 0 to D14; stools were collected on D7, D14 and D42. Fluoroquinolone-susceptible and -resistant enterococci (FQ-SE and FQ-RE) were detected and quantified by culture, and identified by MALDI-TOF MS. The relative abundance of FQ-RE over FQ-SE was determined. The genetic basis of fluoroquinolone resistance was deciphered by partial sequencing of gyrA and parC genes...
March 4, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28333294/antibiotic-consumption-by-new-zealand-children-exposure-is-near-universal-by-the-age-of-5%C3%A2-years
#13
Mark R Hobbs, Cameron C Grant, Stephen R Ritchie, Carol Chelimo, Susan M B Morton, Sarah Berry, Mark G Thomas
Background: Increasing concerns about antibiotic resistance and microbiome disruption have stimulated interest in describing antibiotic consumption in young children. Young children are an age group for whom antibiotics are frequently prescribed. Objectives: To describe community antibiotic dispensing during the first 5 years of life in a large, socioeconomically and ethnically diverse cohort of children, and to determine how antibiotic dispensing varied between population subgroups...
March 13, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28333226/exploring-the-human-microbiome-from-multiple-perspectives-factors-altering-its-composition-and-function
#14
David Rojo, Celia Méndez-García, Beata Anna Raczkowska, Rafael Bargiela, Andrés Moya, Manuel Ferrer, Coral Barbas
Our microbiota presents peculiarities and characteristics that may be altered by multiple factors. The degree and consequences of these alterations depend on the nature, strength and duration of the perturbations as well as the structure and stability of each microbiota. The aim of this review is to sketch a very broad picture of the factors commonly influencing different body sites, and which have been associated with alterations in the human microbiota in terms of composition and function. To do so, first, a graphical representation of bacterial, fungal and archaeal genera reveals possible associations among genera affected by different factors...
February 25, 2017: FEMS Microbiology Reviews
https://www.readbyqxmd.com/read/28333199/effect-of-butyrate-and-lactobacillus-gg-on-a-butyrate-receptor-and-transporter-during-campylobacter-jejuni-exposure
#15
Gail A M Cresci, Paul C Mayer, Stuart A Thompson
Campylobacter jejuni (C. jejuni) frequently infects humans causing many gastrointestinal symptoms, fever, fatigue and several long-term debilitating diseases. Current treatment for campylobacteriosis includes rehydration and in some cases, antibiotic therapy. Probiotics are used to treat several gastrointestinal diseases. Butyrate is a short-chain fatty acid known to promote intestinal health. Interaction of butyrate with its respective receptor (HCAR2) and transporter (SLC5A8), both expressed in the intestine, is associated with water and electrolyte absorption as well as providing defense against colon cancer and inflammation...
February 23, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/28332901/regulation-of-humoral-immunity-by-gut-microbial-products
#16
Myunghoo Kim, Chang H Kim
The intestinal tract provides ideal niches for several different microbial species, which are collectively called the gut microbiota. A key host immune effector that controls the microbiota and prevents mucosal infection is IgA. Gut microbiota-derived factors are largely classified into molecular pattern recognition receptor ligands and nutrient-derived metabolites including short-chain fatty acids and adenosine triphosphate. Along with host-derived factors such as retinoic acid, various cytokines and cytokine-like molecules, gut microbial products profoundly shape B cell responses...
February 28, 2017: Gut Microbes
https://www.readbyqxmd.com/read/28332596/odd-chain-fatty-acids-new-insights-of-the-relationship-between-the-gut-microbiota-dietary-intake-biosynthesis-and-glucose-intolerance
#17
Benjamin J Jenkins, Kevin Seyssel, Sally Chiu, Pin-Ho Pan, Shih-Yi Lin, Elizabeth Stanley, Zsuzsanna Ament, James A West, Keith Summerhill, Julian L Griffin, Walter Vetter, Kaija J Autio, Kalervo Hiltunen, Stéphane Hazebrouck, Renata Stepankova, Chun-Jung Chen, Maud Alligier, Martine Laville, Mary Moore, Guillaume Kraft, Alan Cherrington, Sarah King, Ronald M Krauss, Evelyn de Schryver, Paul P Van Veldhoven, Martin Ronis, Albert Koulman
Recent findings have shown an inverse association between circulating C15:0/C17:0 fatty acids with disease risk, therefore, their origin needs to be determined to understanding their role in these pathologies. Through combinations of both animal and human intervention studies, we comprehensively investigated all possible contributions of these fatty acids from the gut-microbiota, the diet, and novel endogenous biosynthesis. Investigations included an intestinal germ-free study and a C15:0/C17:0 diet dose response study...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28332593/injections-through-skin-colonized-with-staphylococcus-aureus-biofilm-introduce-contamination-despite-standard-antimicrobial-preparation-procedures
#18
Yi Wang, Valery Leng, Viraj Patel, K Scott Phillips
While surgical site preparation has been extensively studied, there is little information about resistance of skin microbiota in the biofilm form to antimicrobial decontamination, and there are no quantitative models to study how biofilm might be transferred into sterile tissue/implant materials during injections for joint spine and tendon, aspiration biopsies and dermal fillers (DF). In this work, we develop two in vitro models to simulate the process of skin preparation and DF injection using pig skin and SimSkin (silicone) materials, respectively...
March 23, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28331803/ivig-a-cure-to-severe-refractory-nap-1-clostridium-difficile-colitis-a-case-of-successful-treatment-of-severe-infection-which-failed-standard-therapy-including-fecal-microbiota-transplants-and-fidaxomicin
#19
Kelley Coffman, Xian Jie Cindy Chen, Charles Okamura, Eddie Louie
The mainstay treatment of Clostridium difficile infections (CDI) is antimicrobials with growing support for fecal microbiota transplants. We report the first case of an elderly man with severe refractory NAP-1 pseudomembranous CDI who failed all medical therapy and two fecal transplants with response only seen after administration of intravenous immunoglobulin.
2017: IDCases
https://www.readbyqxmd.com/read/28331613/systematic-evaluation-of-immune-regulation-and-modulation
#20
REVIEW
David F Stroncek, Lisa H Butterfield, Michael A Cannarile, Madhav V Dhodapkar, Tim F Greten, Jean Charles Grivel, David R Kaufman, Heidi H Kong, Firouzeh Korangy, Peter P Lee, Francesco Marincola, Sergio Rutella, Janet C Siebert, Giorgio Trinchieri, Barbara Seliger
Cancer immunotherapies are showing promising clinical results in a variety of malignancies. Monitoring the immune as well as the tumor response following these therapies has led to significant advancements in the field. Moreover, the identification and assessment of both predictive and prognostic biomarkers has become a key component to advancing these therapies. Thus, it is critical to develop systematic approaches to monitor the immune response and to interpret the data obtained from these assays. In order to address these issues and make recommendations to the field, the Society for Immunotherapy of Cancer reconvened the Immune Biomarkers Task Force...
2017: Journal for Immunotherapy of Cancer
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