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https://www.readbyqxmd.com/read/28445776/antimicrobial-resistance-in-the-bacteroides-fragilis-group-in-faecal-samples-from-patients-receiving-broad-spectrum-antibiotics
#1
Kia Cirkeline Møller Hansen, Simon A F Schwensen, Daniel Pilsgaard Henriksen, Ulrik Stenz Justesen, Thomas Vognbjerg Sydenham
Members of the Bacteroides fragilis group are opportunistic pathogens and cause severe infections including bacteraemia. As increased levels of antimicrobial resistance in B. fragilis group bacteria can be detected years after administration of specific antibiotics, monitoring antimicrobial susceptibility in the gut microbiota could be important. The objectives of this study were to 1) investigate the distribution of species and the occurrence of reduced antimicrobial susceptibility in the B. fragilis group from patients treated at departments with a high level of antibiotic use, 2) to determine the prevalence of the carbapenem resistance gene cfiA in B...
April 23, 2017: Anaerobe
https://www.readbyqxmd.com/read/28442730/exploration-of-the-relationship-between-biogas-production-and-microbial-community-under-high-salinity-conditions
#2
Shaojie Wang, Xiaocong Hou, Haijia Su
High salinity frequently causes inhibition and even failure in anaerobic digestion. To explore the impact of increasing NaCl concentrations on biogas production, and reveal the microbial community variations in response to high salinity stress, the Illumina high-throughput sequencing technology was employed. The results showed that a NaCl concentration of 20 g/L (H group) exhibited a similar level of VFAs and specific CO2 production rate with that in the blank group, thus indicating that the bacterial activity in acidogenesis might not be inhibited...
April 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28441964/fecal-metagenomic-profiles-in-subgroups-of-patients-with-myalgic-encephalomyelitis-chronic-fatigue-syndrome
#3
Dorottya Nagy-Szakal, Brent L Williams, Nischay Mishra, Xiaoyu Che, Bohyun Lee, Lucinda Bateman, Nancy G Klimas, Anthony L Komaroff, Susan Levine, Jose G Montoya, Daniel L Peterson, Devi Ramanan, Komal Jain, Meredith L Eddy, Mady Hornig, W Ian Lipkin
BACKGROUND: Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) is characterized by unexplained persistent fatigue, commonly accompanied by cognitive dysfunction, sleeping disturbances, orthostatic intolerance, fever, lymphadenopathy, and irritable bowel syndrome (IBS). The extent to which the gastrointestinal microbiome and peripheral inflammation are associated with ME/CFS remains unclear. We pursued rigorous clinical characterization, fecal bacterial metagenomics, and plasma immune molecule analyses in 50 ME/CFS patients and 50 healthy controls frequency-matched for age, sex, race/ethnicity, geographic site, and season of sampling...
April 26, 2017: Microbiome
https://www.readbyqxmd.com/read/28440278/an-insider-s-perspective-bacteroides-as-a-window-into-the-microbiome
#4
REVIEW
Aaron G Wexler, Andrew L Goodman
Over the last decade, our appreciation for the contribution of resident gut microorganisms-the gut microbiota-to human health has surged. However, progress is limited by the sheer diversity and complexity of these microbial communities. Compounding the challenge, the majority of our commensal microorganisms are not close relatives of Escherichia coli or other model organisms and have eluded culturing and manipulation in the laboratory. In this Review, we discuss how over a century of study of the readily cultured, genetically tractable human gut Bacteroides has revealed important insights into the biochemistry, genomics and ecology that make a gut bacterium a gut bacterium...
April 25, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28438996/morphotype-of-bacteroids-in-different-legumes-correlates-with-the-number-and-type-of-symbiotic-ncr-peptides
#5
Jesús Montiel, J Allan Downie, Attila Farkas, Péter Bihari, Róbert Herczeg, Balázs Bálint, Peter Mergaert, Attila Kereszt, Éva Kondorosi
In legume nodules, rhizobia differentiate into nitrogen-fixing forms called bacteroids, which are enclosed by a plant membrane in an organelle-like structure called the symbiosome. In the Inverted Repeat-Lacking Clade (IRLC) of legumes, this differentiation is terminal due to irreversible loss of cell division ability and is associated with genome amplification and different morphologies of the bacteroids that can be swollen, elongated, spherical, and elongated-branched, depending on the host plant. In Medicago truncatula, this process is orchestrated by nodule-specific cysteine-rich peptides (NCRs) delivered into developing bacteroids...
April 24, 2017: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/28435359/comparative-antimicrobial-efficacy-of-selected-root-canal-irrigants-on-commonly-isolated-microorganisms-in-endodontic-infection
#6
Sandeep Dubey, Suparna Ganguly Saha, Balakrishnan Rajkumar, Tapan Kumar Dhole
OBJECTIVE: This study aims to evaluate and compare the antimicrobial efficacy of three selected root canal irrigants (BioPure MTAD, metronidazole, aztreonam) against microbes commonly isolated from polymicrobial microbiota of root canal infection. MATERIALS AND METHODS: This study was designed with four experimental groups (Group I - Bacteroides fragilis, Group II - Propionibacterium acnes, Group III - Enterococcus faecalis, Group IV - Candida albicans) based on the microbes selected for the study...
January 2017: European Journal of Dentistry
https://www.readbyqxmd.com/read/28433878/effect-of-freshwater-sediment-characteristics-on-the-persistence-of-fecal-indicator-bacteria-and-genetic-markers-within-a-southern-california-watershed
#7
Amity G Zimmer-Faust, Vanessa Thulsiraj, Catalina Marambio-Jones, Yiping Cao, John F Griffith, Patricia A Holden, Jennifer A Jay
In this study, the aging of culturable FIB and DNA representing genetic markers for Enterococcus spp. (ENT1A), general Bacteroides (GB3), and human-associated Bacteroides (HF183) in freshwater sediments was evaluated. Freshwater sediment was collected from four different sites within the upper and lower reach of the Topanga Creek Watershed and two additional comparator sites within the Santa Monica Bay, for a total of six sites. Untreated (ambient) and oven-dried (reduced microbiota) sediment was inoculated with 5% sewage and artificial freshwater...
April 18, 2017: Water Research
https://www.readbyqxmd.com/read/28433670/evaluation-of-the-routine-antimicrobial-susceptibility-testing-results-of-clinically-significant-anaerobic-bacteria-in-a-slovenian-tertiary-care-hospital-in-2015
#8
Samo Jeverica, Urša Kolenc, Manica Mueller-Premru, Lea Papst
The aim of our study was to determined antimicrobial susceptibility profiles of 2673 clinically significant anaerobic bacteria belonging to the major genera, isolated in 2015 in a large tertiary-care hospital in Slovenia. The species identification was performed by MALDI-TOF mass spectrometry. Antimicrobial susceptibility was determined immediately at the isolation of the strains against: penicillin, co-amoxiclav, imipenem, clindamycin and metronidazole, using gradient diffusion methodology and EUCAST breakpoints...
April 19, 2017: Anaerobe
https://www.readbyqxmd.com/read/28431945/in-vitro-fermentation-behaviors-of-fucosylated-chondroitin-sulfate-from-pearsonothuria-graeffei-by-human-gut-microflora
#9
Chao-Yang Wei, Ning-Bo Liao, Yu Zhang, Xing-Qian Ye, Shan Li, Ya-Qin Hu, Dong-Hong Liu, Robert J Linhardt, Xin Wang, Shi-Guo Chen
A fucosylated chondroitin sulfate (FCS-pg) with highly repeated structure from Pearsonothuria graeffei was subjected to a in vitro fermentation model to investigate its fermentability and effects on human gut microflora. High performance liquid chromatography (HPLC) measurement found FCS-pg can be fermented to short chain fatty acids (SCFAs) by gut microflora from partial human fecal samples. 16S rRNA gene-based polymerase chain reaction-based denaturing gradient gel electrophoresis (PCR-DGGE) profiling and real-time quantitative PCR analysis showed that FCS-pg mainly increased the proportions of Clostridium cluster XI, Bacteriodes prevotella group, Bifidobacterium genus, Clostridium cluster I and Clostridium cluster XIVab, whereas the numbers of the Enterobacteriaceae and Lactobacillus decreased...
April 18, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28431252/engineered-regulatory-systems-modulate-gene-expression-of-human-commensals-in-the-gut
#10
Bentley Lim, Michael Zimmermann, Natasha A Barry, Andrew L Goodman
The gut microbiota is implicated in numerous aspects of health and disease, but dissecting these connections is challenging because genetic tools for gut anaerobes are limited. Inducible promoters are particularly valuable tools because these platforms allow real-time analysis of the contribution of microbiome gene products to community assembly, host physiology, and disease. We developed a panel of tunable expression platforms for the prominent genus Bacteroides in which gene expression is controlled by a synthetic inducer...
April 20, 2017: Cell
https://www.readbyqxmd.com/read/28431251/tunable-expression-tools-enable-single-cell-strain-distinction-in-the-gut-microbiome
#11
Weston R Whitaker, Elizabeth Stanley Shepherd, Justin L Sonnenburg
Applying synthetic biology to engineer gut-resident microbes provides new avenues to investigate microbe-host interactions, perform diagnostics, and deliver therapeutics. Here, we describe a platform for engineering Bacteroides, the most abundant genus in the Western microbiota, which includes a process for high-throughput strain modification. We have identified a novel phage promoter and translational tuning strategy and achieved an unprecedented level of expression that enables imaging of fluorescent-protein-expressing Bacteroides stably colonizing the mouse gut...
April 20, 2017: Cell
https://www.readbyqxmd.com/read/28429209/analysis-of-gut-microbiota-in-patients-with-parkinson-s-disease
#12
V A Petrov, I V Saltykova, I A Zhukova, V M Alifirova, N G Zhukova, Yu B Dorofeeva, A V Tyakht, B A Kovarsky, D G Alekseev, E S Kostryukova, Yu S Mironova, O P Izhboldina, M A Nikitina, T V Perevozchikova, E A Fait, V V Babenko, M T Vakhitova, V M Govorun, A E Sazonov
Gut microbiota of patients with Parkinson's disease and healthy volunteers was analyzed by the method of high throughput 16S rRNA sequencing of bacterial genomes. In patients with Parkinson's diseases, changes in the content of 9 genera and 15 species of microorganisms were revealed: reduced content of Dorea, Bacteroides, Prevotella, Faecalibacterium, Bacteroides massiliensis, Stoquefichus massiliensis, Bacteroides coprocola, Blautia glucerasea, Dorea longicatena, Bacteroides dorei, Bacteroides plebeus, Prevotella copri, Coprococcus eutactus, and Ruminococcus callidus, and increased content of Christensenella, Catabacter, Lactobacillus, Oscillospira, Bifidobacterium, Christensenella minuta, Catabacter hongkongensis, Lactobacillus mucosae, Ruminococcus bromii, and Papillibacter cinnamivorans...
April 20, 2017: Bulletin of Experimental Biology and Medicine
https://www.readbyqxmd.com/read/28424670/azathioprine-mercaptopurine-and-5-aminosalicylic-acid-affect-the-growth-of-ibd-associated-campylobacter-species-and-other-enteric-microbes
#13
Fang Liu, Rena Ma, Stephen M Riordan, Michael C Grimm, Lu Liu, Yiming Wang, Li Zhang
Campylobacter concisus is a bacterium that is associated with inflammatory bowel disease (IBD). Immunosuppressive drugs including azathioprine (AZA) and mercaptopurine (MP), and anti-inflammatory drug such as 5-aminosalicylic acid (5-ASA) are commonly used to treat patients with IBD. This study aimed to examine the effects of AZA, MP, and 5-ASA on the growth of IBD-associated bacterial species and to identify bacterial enzymes involved in immunosuppressive drug metabolism. A total of 15 bacterial strains of five species including 11 C...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28416464/microbiological-quality-of-water-in-a-city-with-persistent-and-recurrent-waterborne-diseases-under-tropical-sub-rural-conditions-the-case-of-kikwit-city-democratic-republic-of-the-congo
#14
Alexis B Nienie, Periyasamy Sivalingam, Amandine Laffite, Patience Ngelinkoto, Jean-Paul Otamonga, Alphonse Matand, Crispin K Mulaji, Emmanuel M Biey, Pius T Mpiana, John Poté
The availability of safe drinking water in sub-Saharan countries remains a major challenge because poor sanitation has been the cause of various outbreaks of waterborne disease due to the poor microbiological quality of water used for domestic purposes. The faecal indicator bacteria (FIB) used in the present study included Escherichia coli (E. coli) and Enterococcus (ENT). FIB and aerobic mesophilic bacteria (AMB) were quantified during July 2015 (dry season) and November 2015 (rainy season) in order to assess the quality of drinking water from wells (n=3; P1-P3), and two rivers, the River Lukemi (RLK, n=3) and River Luini (RLN, n=2) in the city of Kikwit, which is located in the province of Kwilu in the Democratic Republic of the Congo...
March 30, 2017: International Journal of Hygiene and Environmental Health
https://www.readbyqxmd.com/read/28414794/intestinal-extra-intestinal-and-systemic-sequelae-of-toxoplasma-gondii-induced-acute-ileitis-in-mice-harboring-a-human-gut-microbiota
#15
Eliane von Klitzing, Ira Ekmekciu, Anja A Kühl, Stefan Bereswill, Markus M Heimesaat
BACKGROUND: Within seven days following peroral high dose infection with Toxoplasma gondii susceptible conventionally colonized mice develop acute ileitis due to an underlying T helper cell (Th) -1 type immunopathology. We here addressed whether mice harboring a human intestinal microbiota developed intestinal, extra-intestinal and systemic sequelae upon ileitis induction. METHODOLOGY/PRINCIPAL FINDINGS: Secondary abiotic mice were generated by broad-spectrum antibiotic treatment and associated with a complex human intestinal microbiota following peroral fecal microbiota transplantation...
2017: PloS One
https://www.readbyqxmd.com/read/28414678/what-the-eyes-don-t-see-the-heart-does-grieve-over
#16
M Sciaudone, M Dery
INTRODUCTION: A 71 year old Peruvian woman presented with blurry vision and bilateral eye pain and had evidence of bilateral endophthalmitis on eye examination. Her past medical history was notable for multiple abdominal surgeries within the preceding months, including an incarcerated inguinal hernia repair which required an ileostomy placement, and cholecystitis requiring cholecystostomy tube placement. Over her multiple long hospitalizations, she developed bacteremia and fungemia on several occasions, with organisms including Enterobacter cloacae, Klebsiella pneumoniae, Bacteroides fragilis, Pseudomonas aeruginosa, Enterococcus faecium, and Candida albicans...
March 2017: Journal of the Louisiana State Medical Society: Official Organ of the Louisiana State Medical Society
https://www.readbyqxmd.com/read/28414107/antimicrobial-susceptibility-of-bacteroides-fragilis-group-organisms-in-hong-kong-by-the-tentative-eucast-disc-diffusion-method
#17
Pak-Leung Ho, Chong-Yee Yau, Lok-Yan Ho, Eileen Ling-Yi Lai, Melissa Chun-Jiao Liu, Cindy Wing-Sze Tse, Kin-Hung Chow
This study used a recently developed EUCAST disc diffusion method to measure the susceptibility of 741 B. fragilis group isolates to six antibiotics. Isolates nonsusceptible to imipenem and metronidazole by the disc method were further investigated by E-test. Species identification was obtained by matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF MS), PCR assays and 16S rRNA sequencing. The most common species were B. fragilis (n = 424, including 81 division II and 343 division I isolates), B...
April 14, 2017: Anaerobe
https://www.readbyqxmd.com/read/28410377/plasma-from-patients-with-anti-glomerular-basement-membrane-disease-could-recognize-microbial-peptides
#18
Jian-Nan Li, Xiaoyu Jia, Yongqiang Wang, Can Xie, Taijiao Jiang, Zhao Cui, Ming-Hui Zhao
Infection has long been suspected as a trigger of autoimmune diseases, and molecular mimicry mechanism was hypothesized in this study. Microbe originated peptides were searched from the Uniprot database based on a previous defined critical amino acid motif within α3129-150, isoleucine137, tryptophan140, glycine142, phenylalanine 143 and phenylalanine 145. 23826 microbial peptides were identified using our searching strategy, among which seven were related with human infections. Circulating IgG and IgM antibodies against the seven microbial peptides were detected using ELISA in 76 patients with anti-GBM disease...
2017: PloS One
https://www.readbyqxmd.com/read/28405600/longitudinal-analysis-of-the-intestinal-microbiota-in-liver-transplantation
#19
Karin Kato, Miki Nagao, Kentaro Miyamoto, Kentaro Oka, Motomichi Takahashi, Masaki Yamamoto, Yasufumi Matsumura, Toshimi Kaido, Shinji Uemoto, Satoshi Ichiyama
BACKGROUND: Increasing evidence suggests that the intestinal microbiota plays an important role in liver diseases. However, the dynamics of the intestinal microbiota during liver transplantation (LT) and its potential role in clinical course remain unknown. METHODS: We prospectively analyzed the intestinal microbiota of 38 patients who underwent LT in Kyoto University Hospital. We characterized the microbial compositions of fecal specimens from LT patients using a metagenomics approach by an Illumina MiSeq platform...
April 2017: Transplantation Direct
https://www.readbyqxmd.com/read/28404640/comprehensive-evaluation-of-the-bactericidal-activities-of-free-bile-acids-in-the-large-intestine-of-humans-and-rodents
#20
Masamichi Watanabe, Satoru Fukiya, Atsushi Yokota
In addition to functioning as detergents that aid digestion of dietary lipids in the intestine, some bile acids have been shown to exhibit antimicrobial activity. However, detailed information on the bactericidal activities of the diverse molecular species of bile acid in humans and rodents is largely unknown. Here, we investigated the toxicity of 14 typical human and rodent free bile acids (FBAs) by monitoring intracellular pH, membrane integrity, and viability of a human intestinal bacterium, Bifidobacterium breve JCM 1192(T), upon exposure to these FBAs...
April 12, 2017: Journal of Lipid Research
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