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Gut Pathogens

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https://www.readbyqxmd.com/read/28439301/prevalence-virulence-potential-and-pulsed-field-gel-electrophoresis-profiling-of-shiga-toxin-producing-escherichia-coli-strains-from-cattle
#1
Hee-Jin Dong, Soomin Lee, Woohyun Kim, Jae-Uk An, Junhyung Kim, Danil Kim, Seongbeom Cho
BACKGROUND: As a primary source of Shiga-toxin-producing Escherichia coli (STEC) infection, cattle are often targeted to develop strategies for reducing STEC contamination. Monitoring the virulence potentials of STEC isolates from cattle is important for tracing contamination sources, managing outbreaks or sporadic cases, and reducing the risks for human infection. This study aimed to investigate the prevalence of STEC in cattle farm samples in South Korea and to assess their virulence potentials...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28439300/genetic-variants-of-helicobacter-pylori-type-iv-secretion-system-components-cagl-and-cagi-and-their-association-with-clinical-outcomes
#2
Hirofumi Ogawa, Akira Iwamoto, Toshihito Tanahashi, Rina Okada, Koji Yamamoto, Shin Nishiumi, Masaru Yoshida, Takeshi Azuma
BACKGROUND: Helicobacter pylori infection is associated with risk for chronic gastritis (CG), gastric ulcer (GU), duodenal ulcer (DU), and gastric cancer (GC). The H. pylori Cag type IV secretion system (TFSS) translocates the virulence factor cytotoxin-associated gene A protein into host cells and plays an important role in initiating gastric carcinogenesis. The CagL and CagI proteins are components of the TFSS. The Arg-Gly-Asp (RGD) motif of CagL, and the six most distal C-terminal amino acids (Ser-Lys-Ile-Ile-Val-Lys, and Ser-Lys-Val-Ile-Val-Lys) of CagL and CagI are essential for TFSS adhesion to host cells...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28439299/substance-p-enhances-lactic-acid-and-tyramine-production-in-enterococcus-faecalis-v583-and-promotes-its-cytotoxic-effect-on-intestinal-caco-2-tc7-cells
#3
Kelly Biaggini, Valérie Borrel, Sabine Szunerits, Rabah Boukherroub, Awa N'Diaye, Arthur Zébré, Maryse Bonnin-Jusserand, Guillaume Duflos, Marc Feuilloley, Djamel Drider, Pierre Déchelotte, Nathalie Connil
BACKGROUND: Enterococcus faecalis, generally considered as a saprophytic bowel commensal, has recently emerged as an important nosocomial pathogen causing severe urinary tract infections, surgical wound infections, bacteremia, and bacterial endocarditis. This bacterium is capable of forming biofilms on various surfaces and its high level of antibiotic resistance contributes to its pathogenicity. The aim of this study was to evaluate the effect on E. faecalis, of Substance P (SP), an antimicrobial peptide that is produced in the gut and skin...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28439298/multi-drug-resistant-pathogenic-bacteria-in-the-gut-of-young-children-in-bangladesh
#4
Shirajum Monira, Syeda Antara Shabnam, Sk Imran Ali, Abdus Sadique, Fatema-Tuz Johura, Kazi Zillur Rahman, Nur Haque Alam, Haruo Watanabe, Munirul Alam
BACKGROUND: The gut of human harbors diverse commensal microbiota performing an array of beneficial role for the hosts. In the present study, the major commensal gut bacteria isolated by culturing methods from 15 children of moderate income families, aged between 10 and 24 months, were studied for their response to different antibiotics, and the molecular basis of drug resistance. RESULTS: Of 122 bacterial colonies primarily selected from Luria-Bertani agar, bacterial genera confirmed by analytical profile index (API) 20E(®) system included Escherichia as the predominant (52%) organism, followed by Enterobacter (16%), Pseudomonas (12%), Klebsiella (6%), Pantoea (6%), Vibrio (3%), and Citrobacter (3%); while Aeromonas and Raoultella were identified as the infrequently occurring genera...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28413454/helicobacter-pylori-vaca-s1m1-genotype-but-not-caga-or-baba2-increase-the-risk-of-ulcer-and-gastric-cancer-in-patients-from-southern-mexico
#5
Adolfo Román-Román, Dinorah Nashely Martínez-Carrillo, Josefina Atrisco-Morales, Julio César Azúcar-Heziquio, Abner Saúl Cuevas-Caballero, Carlos Alberto Castañón-Sánchez, Roxana Reyes-Ríos, Reyes Betancourt-Linares, Salomón Reyes-Navarrete, Iván Cruz-Del Carmen, Margarita Camorlinga-Ponce, Enoc Mariano Cortés-Malagón, Gloria Fernández-Tilapa
BACKGROUND: The vacA, cagA and babA2 genotypes of Helicobacter pylori are associated with gastric pathology. The objectives were to determine the frequency of infection and distribution of the vacA, cagA and babA2 genotypes of H. pylori in patients with gastric ulcer, chronic gastritis and gastric cancer, and to evaluate the association of virulent genotypes with diagnosis. METHODS: We studied 921 patients with symptoms of dyspepsia or with presumptive diagnosis of gastric cancer...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28413453/amelioration-of-intestinal-and-systemic-sequelae-of-murine-campylobacter-jejuni-infection-by-probiotic-vsl-3-treatment
#6
Ira Ekmekciu, Ulrike Fiebiger, Kerstin Stingl, Stefan Bereswill, Markus M Heimesaat
BACKGROUND: The incidence of human Campylobacter jejuni infections is progressively increasing worldwide. Probiotic compounds might open up valuable tools to decrease pathogen burden and subsequent pro-inflammatory immune responses, but in vivo data are scarce. METHODS AND RESULTS: Secondary abiotic mice generated by broad-spectrum antibiotic treatment were perorally challenged with the commercial probiotic compound VSL#3 consisting of Streptococcus thermophilus, Bifidobacterium breve, Bifidobacterium longum, Bifidobacterium infantis, Lactobacillus acidophilus, Lactobacillus plantarum, Lactobacillus paracasei, and Lactobacillus delbrueckii ssp...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28400860/multiple-etiologies-of-infectious-diarrhea-and-concurrent-infections-in-a-pediatric-outpatient-based-screening-study-in-odisha-india
#7
Arpit Kumar Shrivastava, Subrat Kumar, Nirmal Kumar Mohakud, Mrutyunjay Suar, Priyadarshi Soumyaranjan Sahu
BACKGROUND: There are multiple etiologies responsible for infectious gastroenteritis causing acute diarrhea which are often under diagnosed. Also acute diarrhea is one of the major causes of morbidity and mortality among children less than 5 years of age. METHODS: In our study, fecal samples (n = 130) were collected from children (<5 years) presenting with symptoms of acute diarrhea. Samples were screened for viral, bacterial, and parasitic etiologies. Rotavirus and Adenovirus were screened by immunochromatographic tests...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28392838/global-gene-expression-in-escherichia-coli-isolated-from-the-diseased-ocular-surface-of-the-human-eye-with-a-potential-to-form-biofilm
#8
Konduri Ranjith, Kotakonda Arunasri, Gundlapally Sathyanarayana Reddy, HariKrishna Adicherla, Savitri Sharma, Sisinthy Shivaji
BACKGROUND: Escherichia coli, the gastrointestinal commensal, is also known to cause ocular infections such as conjunctivitis, keratitis and endophthalmitis. These infections are normally resolved by topical application of an appropriate antibiotic. But, at times these E. coli are resistant to the antibiotic and this could be due to formation of a biofilm. In this study ocular E. coli from patients with conjunctivitis, keratitis or endophthalmitis were screened for their antibiotic susceptibility and biofilm formation potential...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28289440/role-of-tlr1-tlr2-and-tlr6-in-the-modulation-of-intestinal-inflammation-and-candida-albicans-elimination
#9
Laura Choteau, Hélène Vancraeyneste, Didier Le Roy, Laurent Dubuquoy, Luiginia Romani, Thierry Jouault, Daniel Poulain, Boualem Sendid, Thierry Calandra, Thierry Roger, Samir Jawhara
BACKGROUND: Toll-like receptors (TLRs) are the major pattern recognition receptors that mediate sensing of a wide range of microorganisms. TLR2 forms heterodimers with either TLR1 or TLR6, broadening its ligand diversity against pathogens. TLR1, TLR2 and TLR6 have been implicated in the recognition of Candida albicans, an opportunistic fungal pathogen that colonizes the gastrointestinal tract. In this study, we explored whether the deficiency in TLR1, TLR2 or TLR6 impacts C. albicans colonization and inflammation-associated colonic injury in the dextran sulfate sodium (DSS)-induced colitis in mice...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28286572/attenuation-of-helicobacter-pylori-induced-gastric-inflammation-by-prior-cag-strain-am1-infection-in-c57bl-6-mice
#10
Nillu Ghosh, Prachetash Ghosh, Kousik Kesh, Asish K Mukhopadhyay, Snehasikta Swarnakar
BACKGROUND: Helicobacter pylori, colonize in stomach of ~50% of the world population. cag pathogenicity Island of H. pylori is one of the important virulent factors that attributed to gastric inflammation. Coinfection with H. pylori strain with different genetic makeup alters the degree of pathogenicity and susceptibility towards antibiotics. The present study investigates host immunomodulatory effects of H. pylori infection by both cag(+) strain (SS1) and cag(-) strain (AM1). C57BL/6 mice were infected with AM1 or SS1 strain as well as AM1 followed by SS1 (AM1/SS1) and vice versa...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28286571/we-are-not-alone-a-case-for-the-human-microbiome-in-extra-intestinal-diseases
#11
EDITORIAL
S Shivaji
BACKGROUND: "Dysbiosis" in the gut microbiome has been implicated in auto-immune diseases, in inflammatory diseases, in some cancers and mental disorders. The challenge is to unravel the cellular and molecular basis of dysbiosis so as to understand the disease manifestation. MAIN BODY: Next generation sequencing and genome enabled technologies have led to the establishment of the composition of gut microbiomes and established that "dysbiosis" is the cause of several diseases...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28286570/strain-specific-probiotic-properties-of-lactic-acid-bacteria-and-their-interference-with-human-intestinal-pathogens-invasion
#12
Raffaella Campana, Saskia van Hemert, Wally Baffone
BACKGROUND: One of the working mechanisms of probiotic bacteria is their ability to compete with pathogens. To define the probiotic properties of seven Lactic Acid Bacteria (LAB) strains, we tested them for survival in simulated gastro-intestinal conditions, antimicrobial activities, co-aggregative abilities, and interferences studies against five human intestinal pathogens (Salmonella enteritidis ATCC 13076, Listeria monocytogenes ATCC 7644, Escherichia coli O157: H7 ATCC 35150, Cronobacter sakazakii ATCC 29544 and Campylobacter jejuni ATCC 33291)...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28250847/oral-administration-of-clostridium-butyricum-cgmcc0313-1-inhibits-%C3%AE-lactoglobulin-induced-intestinal-anaphylaxis-in-a-mouse-model-of-food-allergy
#13
Juan Zhang, Hui Su, Qiuhong Li, Haixia Wu, Mengyun Liu, Jianqiong Huang, Minghua Zeng, Yuejie Zheng, Xin Sun
BACKGROUND: Probiotic bacteria can induce immune regulation or immune tolerance in patients with allergic diseases, but the underlying mechanisms are still unclear. There has been a growing interest in the use of beneficial bacteria for allergic diseases recently. This study aimed at exploring whether Clostridium butyricum CGMCC0313-1 (C. butyricum) can reduce β-lactoglobulin(BLG)-induced intestinal anaphylaxis in a murine model of food allergy. METHODS: The preventive and therapeutic effects of oral C...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28239422/differential-regulation-of-riboflavin-supply-genes-in-vibrio-cholerae
#14
Ignacio Sepúlveda Cisternas, Alexia Torres, Andrés Fuentes Flores, Víctor Antonio García Angulo
BACKGROUND: Riboflavin is the precursor of important redox cofactors such as flavin mononucleotide (FMN) and flavin adenine dinucleotide, required for several biological processes. Vibrio cholerae, a pathogenic bacterium responsible for the cholera disease, possesses the ability to biosynthesize de novo as well as to uptake riboflavin through the riboflavin biosynthetic pathway (RBP) and the RibN importer, respectively. The intra-organism relationship between riboflavin biosynthesis and uptake functions has not been studied...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28203289/epidemiological-molecular-characterization-and-antibiotic-resistance-of-salmonella-enterica-serovars-isolated-from-chicken-farms-in-egypt
#15
Hanem El-Sharkawy, Amin Tahoun, Abd El-Galiel A El-Gohary, Moshira El-Abasy, Fares El-Khayat, Trudi Gillespie, Yukio Kitade, Hafez M Hafez, Heinrich Neubauer, Hosny El-Adawy
BACKGROUND: Salmonella is one of major causes of foodborne outbreaks globally. This study was conducted to estimate the prevalence, typing and antibiotic susceptibilities of Salmonella enterica serovars isolated from 41 broiler chicken farms located in Kafr El-Sheikh Province in Northern Egypt during 2014-2015. The clinical signs and mortalities were observed. RESULTS: In total 615 clinical samples were collected from broiler flocks from different organs (liver, intestinal content and gall bladder)...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28191041/comparative-genomic-analysis-of-shiga-toxin-producing-and-non-shiga-toxin-producing-escherichia-coli-o157-isolated-from-outbreaks-in-korea
#16
Taesoo Kwon, Won Kim, Seung-Hak Cho
BACKGROUND: The Shiga toxin-producing Escherichia coli (STEC) O157 strain NCCP15739 and non-STEC O157 strain NCCP15738 were isolated from outbreaks in Korea. We characterized NCCP15739 and NCCP15738 by genome sequencing and a comparative genomic analysis using two additional strains, E. coli K-12 substr. MG1655 and O157:H7 EDL933. RESULTS: Using the Illumina HiSeq 2000 platform and the RAST server, the whole genomes of NCCP15739 and NCCP15738 were obtained and annotated...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28127404/influence-of-pcp1netb-ancillary-genes-on-the-virulence-of-clostridium-perfringens-poultry-necrotic-enteritis-strain-cp1
#17
Hongzhuan Zhou, Dion Lepp, Yanlong Pei, Mei Liu, Xianhua Yin, Rongcai Ma, John F Prescott, Joshua Gong
BACKGROUND: Necrotic enteritis (NE) is an economically important disease of poultry caused by certain Clostridium perfringens type A strains. The NetB toxin plays a critical role in the pathogenesis of NE. We previously demonstrated that netB is located within a 42 kb plasmid-encoded pathogenicity locus (NELoc-1), which also encodes 36 additional genes. Although NetB clearly plays a role in pathogenesis, the involvement of the other NELoc-1 genes has not yet been established. The current study was to provide experimental evidence to confirm the involvement of these genes in NE pathogenesis...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28127403/campylobacter-jejuni-infection-of-conventionally-colonized-mice-lacking-nucleotide-oligomerization-domain-2
#18
Stefan Bereswill, Ursula Grundmann, Marie E Alutis, André Fischer, Markus M Heimesaat
BACKGROUND: The nucleotide-binding oligomerisaton protein 2 (NOD2) constitutes a pivotal sensor of bacterial muramyl dipeptide and assures expression of distinct antimicrobial peptides and mediators produced by enterocytes and immune cells directed against pathogens including Campylobacter jejuni. We here elucidated the role of NOD2 during murine C. jejuni infection in more detail. RESULTS: Conventionally colonized NOD2 deficient (NOD2(-/-)) mice and corresponding wildtype (WT) counterparts were perorally infected with C...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28115993/acute-ileitis-facilitates-infection-with-multidrug-resistant-pseudomonas-aeruginosa-in-human-microbiota-associated-mice
#19
Eliane von Klitzing, Ira Ekmekciu, Stefan Bereswill, Markus M Heimesaat
BACKGROUND: The rising incidence of multidrug resistant (MDR) Gram-negative bacteria including Pseudomonas aeruginosa has become a serious issue in prevention of its spread particularly among hospitalized patients. It is, however, unclear whether distinct conditions such as acute intestinal inflammation facilitate P. aeruginosa infection of vertebrate hosts. METHODS AND RESULTS: To address this, we analysed P. aeruginosa infection in human microbiota-associated (hma) mice with acute ileitis induced by peroral Toxoplasma gondii challenge...
2017: Gut Pathogens
https://www.readbyqxmd.com/read/28105081/cross-feeding-of-glucose-metabolism-byproducts-of-escherichia-coli-human-gut-isolates-and-probiotic-strains-affect-survival-of-vibrio-cholerae
#20
Chirantana Sengupta, Manjula Ekka, Saurabh Arora, Prashant D Dhaware, Rukhsana Chowdhury, Saumya Raychaudhuri
Vibrio cholerae converts glucose into either acid or the neutral end product acetoin and its survival in carbohydrate enriched media is linked to the nature of the byproducts produced. It has been demonstrated in this study that Escherichia coli strain isolated from the gut of healthy human volunteers and the commonly used probiotic E. coli Nissle strain that metabolize glucose to acidic byproducts drastically reduce the survival of V. cholerae strains irrespective of their glucose sensitivity and acetoin production status...
2017: Gut Pathogens
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