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https://www.readbyqxmd.com/read/28545241/lactobacillus-rhamnosus-hn001-and-lactobacillus-acidophilus-la-14-attenuate-gardnerella-vaginalis-infected-bacterial-vaginosis-in-mice
#1
Se-Eun Jang, Jin-Ju Jeong, Su-Young Choi, Hyunji Kim, Myung Joo Han, Dong-Hyun Kim
Oral administration of a probiotic mixture (PM; Respecta(®)) consisting of Lactobacillus rhamnosus HN001 (L1), Lactobacillus acidophilus La-14 (L2), and lactoferrin RCXTM results in colonization of these probiotics in the vagina of healthy women. Therefore, we examined whether vaginal colonization of the PM ingredients L1 and L2 could attenuate bacterial vaginosis (BV). BV was induced in mice via β-estradiol-3-benzoate-induced immunosuppression and intravaginal inoculation with Gardnerella vaginalis (GV)...
May 23, 2017: Nutrients
https://www.readbyqxmd.com/read/28545041/effect-of-early-measles-vaccine-on-pneumococcal-colonization-a-randomized-trial-from-guinea-bissau
#2
Nadja Skadkær Hansen, Stine Byberg, Lars Hervig Jacobsen, Morten Bjerregaard-Andersen, Aksel Karl Georg Jensen, Cesario Martins, Peter Aaby, Jørgen Skov Jensen, Christine Stabell Benn, Hilton Whittle
BACKGROUND: Measles vaccine (MV) may have non-specific beneficial effects for child health and particularly seems to prevent respiratory infections. Streptococcus pneumoniae is the leading cause of bacterial pneumonia among children worldwide, and nasopharyngeal colonization precedes infection. OBJECTIVE: We investigated whether providing early MV at 18 weeks of age reduced pneumococcal colonization and/or density up to 9 months of age. METHOD: The study was conducted in 2013-2014 in Guinea-Bissau...
2017: PloS One
https://www.readbyqxmd.com/read/28542929/the-immune-response-to-prevotella-bacteria-in-chronic-inflammatory-disease
#3
REVIEW
Jeppe Madura Larsen
The microbiota plays a central role in human health and disease by shaping immune development, immune responses, metabolism, and protecting from invading pathogens. Technical advances that allow comprehensive characterization of microbial communities by genetic sequencing have sparked the hunt for disease modulating bacteria. Emerging studies in humans have linked increased abundance of Prevotella species at mucosal sites to localized and systemic disease, including periodontitis, bacterial vaginosis, rheumatoid arthritis, metabolic disorders, and low-grade systemic inflammation...
May 19, 2017: Immunology
https://www.readbyqxmd.com/read/28542173/metabolic-and-fitness-determinants-for-in-vitro-growth-and-intestinal-colonization-of-the-bacterial-pathogen-campylobacter-jejuni
#4
Beile Gao, Hanne Vorwerk, Claudia Huber, Maria Lara-Tejero, Juliane Mohr, Andrew L Goodman, Wolfgang Eisenreich, Jorge E Galán, Dirk Hofreuter
Campylobacter jejuni is one of the leading infectious causes of food-borne illness around the world. Its ability to persistently colonize the intestinal tract of a broad range of hosts, including food-producing animals, is central to its epidemiology since most infections are due to the consumption of contaminated food products. Using a highly saturated transposon insertion library combined with next-generation sequencing and a mouse model of infection, we have carried out a comprehensive genome-wide analysis of the fitness determinants for growth in vitro and in vivo of a highly pathogenic strain of C...
May 2017: PLoS Biology
https://www.readbyqxmd.com/read/28542110/pneumonia-after-liver-transplantation
#5
Stephanie A K Angarita, Tara A Russell, Fady M Kaldas
PURPOSE OF REVIEW: Pneumonia occurs in 8-23% of patients after liver transplantation and contributes considerably to their morbidity and mortality. With the increasing acuity of liver transplantation patients in the current era, pneumonias, particularly ventilator-associated pneumonias, and multidrug-resistant pathogens, are of growing concern. RECENT FINDINGS: Postliver transplantation pneumonia cause varies with the timing of infection. In the early period (<1 month postliver transplantation), nosocomial pneumonias, including ventilator-associated pneumonias and multidrug-resistant species are most common...
May 24, 2017: Current Opinion in Organ Transplantation
https://www.readbyqxmd.com/read/28541500/prophylactic-efficacy-of-hyperimmune-bovine-colostral-antiadhesin-antibodies-against-enterotoxigenic-escherichia-coli-diarrhea-a-randomized-double-blind-placebo-controlled-phase-1-trial
#6
Stephen J Savarino, Robin McKenzie, David R Tribble, Chad K Porter, Aisling O'Dowd, Joyce A Cantrell, Stephanie A Sincock, Steven T Poole, Barbara DeNearing, Colleen M Woods, Hye Kim, Shannon L Grahek, Carl Brinkley, Joseph H Crabb, A Louis Bourgeois
Background.: Tip-localized adhesive proteins of bacterial fimbriae from diverse pathogens confer protection in animal models, but efficacy in humans has not been reported. Enterotoxigenic Escherichia coli (ETEC) commonly elaborate colonization factors comprising a minor tip adhesin and major stalk-forming subunit. We assessed the efficacy of antiadhesin bovine colostral IgG (bIgG) antibodies against ETEC challenge in volunteers. Methods.: Adults were randomly assigned (1:1:1) to take oral hyperimmune bIgG raised against CFA/I minor pilin subunit (CfaE) tip adhesin or colonization factor I (CFA/I) fimbraie (positive control) or placebo...
May 24, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28540732/mouse-model-of-colonization-of-the-digestive-tract-with-acinetobacter-baumannii-and-subsequent-pneumonia
#7
Noémie Coron, Silvie Pavlickova, Angélique Godefroy, Hélène Pailhoriès, Marie Kempf, Viviane Cassisa, Laurent Marsollier, Estelle Marion, Marie-Laure Joly-Guillou, Matthieu Eveillard
AIM: Implementing a mouse model of Acinetobacter baumannii (AB) digestive colonization and studying the propensity of an intestinal reservoir of AB to be at the origin of pneumonia. MATERIALS & METHODS: After a disruption of the digestive flora by piperacillin-tazobactam, two multidrug-resistant AB strains were intranasally inoculated to two cohorts of ten mice daily. For each strain, five mice were rendered transiently neutropenic. RESULTS & CONCLUSION: One strain persisted several weeks in the digestive tract, even after stopping piperacillin-tazobactam injections, leading to the hypothesis that some AB strains can authentically colonize the gut...
May 25, 2017: Future Microbiology
https://www.readbyqxmd.com/read/28539918/the-sapa-protein-is-involved-in-resistance-to-antimicrobial-peptide-pr-39-and-virulence-of-actinobacillus-pleuropneumoniae
#8
Fang Xie, Yalei Wang, Gang Li, Shuanghong Liu, Ning Cui, Siguo Liu, Paul R Langford, Chunlai Wang
Antimicrobial peptides are essential to the innate immune defense of the mammal against bacterial infection. However, pathogenic bacteria have evolved multiple strategies to resist and evade antimicrobial peptides, which is vital to bacterial survival and colonization in hosts. PR-39 is a linear porcine antimicrobial peptide containing 39 amino acid residues with a high proline content. Resistance to antimicrobial peptide PR-39 has been observed in Actinobacillus pleuropneumoniae. However, little is known about the factors required for this resistance...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28539477/bacterial-colonization-and-succession-in-a-newly-opened-hospital
#9
Simon Lax, Naseer Sangwan, Daniel Smith, Peter Larsen, Kim M Handley, Miles Richardson, Kristina Guyton, Monika Krezalek, Benjamin D Shogan, Jennifer Defazio, Irma Flemming, Baddr Shakhsheer, Stephen Weber, Emily Landon, Sylvia Garcia-Houchins, Jeffrey Siegel, John Alverdy, Rob Knight, Brent Stephens, Jack A Gilbert
The microorganisms that inhabit hospitals may influence patient recovery and outcome, although the complexity and diversity of these bacterial communities can confound our ability to focus on potential pathogens in isolation. To develop a community-level understanding of how microorganisms colonize and move through the hospital environment, we characterized the bacterial dynamics among hospital surfaces, patients, and staff over the course of 1 year as a new hospital became operational. The bacteria in patient rooms, particularly on bedrails, consistently resembled the skin microbiota of the patient occupying the room...
May 24, 2017: Science Translational Medicine
https://www.readbyqxmd.com/read/28538678/effects-of-commercial-apple-varieties-on-human-gut-microbiota-composition-and-metabolic-output-using-an-in-vitro-colonic-model
#10
Athanasios Koutsos, Maria Lima, Lorenza Conterno, Mattia Gasperotti, Martina Bianchi, Francesca Fava, Urska Vrhovsek, Julie A Lovegrove, Kieran M Tuohy
Apples are a rich source of polyphenols and fiber. A major proportion of apple polyphenols escape absorption in the small intestine and together with non-digestible polysaccharides reach the colon, where they can serve as substrates for bacterial fermentation. Animal studies suggest a synergistic interaction between apple polyphenols and the soluble fiber pectin; however, the effects of whole apples on human gut microbiota are less extensively studied. Three commercial apple varieties-Renetta Canada, Golden Delicious and Pink Lady-were digested and fermented in vitro using a batch culture colonic model (pH 5...
May 24, 2017: Nutrients
https://www.readbyqxmd.com/read/28537409/-ureterointestinal-anastomosis-in-urinary-diversion-current-opinion
#11
J Doležel
Uretero-intestinal anastomosis (UIA) is one of the most critical points for the occurrence of severe complications of intestinal urinary diversion. Perfection of the current techniques and development of new UIA methods are motivated by the effort to reduce both early and late post-surgical complications. The necessity of using antireflux UIA, especially with an orthotopic neobladder, is controversial: according to some authors, antireflux UIA of any type generally increases, in comparison with reflux UIA, the risk of obstruction that endangers renal function more than the urine reflux itself...
2017: Rozhledy V Chirurgii: Měsíčník Československé Chirurgické Společnosti
https://www.readbyqxmd.com/read/28536678/the-role-and-mechanism-of-erythrocyte-invasion-by-francisella-tularensis
#12
Deanna M Schmitt, Rebecca Barnes, Taylor Rogerson, Ashley Haught, Leanne K Mazzella, Matthew Ford, Tricia Gilson, James W-M Birch, Anders Sjöstedt, Douglas S Reed, Jonathan M Franks, Donna B Stolz, James Denvir, Jun Fan, Swanthana Rekulapally, Donald A Primerano, Joseph Horzempa
Francisella tularensis is an extremely virulent bacterium that can be transmitted naturally by blood sucking arthropods. During mammalian infection, F. tularensis infects numerous types of host cells, including erythrocytes. As erythrocytes do not undergo phagocytosis or endocytosis, it remains unknown how F. tularensis invades these cells. Furthermore, the consequence of inhabiting the intracellular space of red blood cells (RBCs) has not been determined. Here, we provide evidence indicating that residing within an erythrocyte enhances the ability of F...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28536572/the-bacteriophage-ef-p29-efficiently-protects-against-lethal-vancomycin-resistant-enterococcus-faecalis-and-alleviates-gut-microbiota-imbalance-in-a-murine-bacteremia-model
#13
Mengjun Cheng, Jiaming Liang, Yufeng Zhang, Liyuan Hu, Pengjuan Gong, Ruopeng Cai, Lei Zhang, Hao Zhang, Jinli Ge, Yalu Ji, Zhimin Guo, Xin Feng, Changjiang Sun, Yongjun Yang, Liancheng Lei, Wenyu Han, Jingmin Gu
Enterococcus faecalis is becoming an increasingly important opportunistic pathogen worldwide, especially because it can cause life-threatening nosocomial infections. Treating E. faecalis infections has become increasingly difficult because of the prevalence of multidrug-resistant E. faecalis strains. Because bacteriophages show specificity for their bacterial hosts, there has been a growth in interest in using phage therapies to combat the rising incidence of multidrug-resistant bacterial infections. In this study, we isolated a new lytic phage, EF-P29, which showed high efficiency and a broad host range against E...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28536562/use-of-wild-type-or-recombinant-lactic-acid-bacteria-as-an-alternative-treatment-for-gastrointestinal-inflammatory-diseases-a-focus-on-inflammatory-bowel-diseases-and-mucositis
#14
REVIEW
Rodrigo D De Oliveira Carvalho, Fillipe L R do Carmo, Alberto de Oliveira Junior, Philippe Langella, Jean-Marc Chatel, Luis G Bermúdez-Humarán, Vasco Azevedo, Marcela S de Azevedo
The human gastrointestinal tract (GIT) is highly colonized by bacterial communities, which live in a symbiotic relationship with the host in normal conditions. It has been shown that a dysfunctional interaction between the intestinal microbiota and the host immune system, known as dysbiosis, is a very important factor responsible for the development of different inflammatory conditions of the GIT, such as the idiopathic inflammatory bowel diseases (IBD), a complex and multifactorial disorder of the GIT. Dysbiosis has also been implicated in the pathogenesis of other GIT inflammatory diseases such as mucositis usually caused as an adverse effect of chemotherapy...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28536292/capsule-production-and-glucose-metabolism-dictate-fitness-during-serratia-marcescens-bacteremia
#15
Mark T Anderson, Lindsay A Mitchell, Lili Zhao, Harry L T Mobley
Serratia marcescens is an opportunistic pathogen that causes a range of human infections, including bacteremia, keratitis, wound infections, and urinary tract infections. Compared to other members of the Enterobacteriaceae family, the genetic factors that facilitate Serratia proliferation within the mammalian host are less well defined. An in vivo screen of transposon insertion mutants identified 212 S. marcescens fitness genes that contribute to bacterial survival in a murine model of bloodstream infection...
May 23, 2017: MBio
https://www.readbyqxmd.com/read/28535857/functional-characterization-of-the-collagen-binding-protein-dip2093-and-its-influence-on-host-pathogen-interaction-and-arthritogenic-potential-of-corynebacterium-diphtheriae
#16
Renata Stavracakis Peixoto, Camila Azevedo Antunes, Liliane Simpson Lourêdo, Vanilda Gonçalves Viana, Cintia Silva Dos Santos, Jemima Fuentes Ribeiro da Silva, Raphael Hirata, Elena Hacker, Ana Luíza Mattos-Guaraldi, Andreas Burkovski
Corynebacterium diphtheriae is typically recognized as the a etiological agent of diphtheria, a toxaemic infection of the respiratory tract; however, both non-toxigenic and toxigenic strains are increasingly isolated from cases of invasive infections. The molecular mechanisms responsible for bacterial colonization and dissemination to host tissues remain only partially understood. In this report, we investigated the role of DIP2093, described as a putative adhesin of the serine-aspartate repeat (Sdr) protein family in host-pathogen interactions of C...
May 23, 2017: Microbiology
https://www.readbyqxmd.com/read/28535686/development-and-characterization-of-a-stable-adhesive-bond-between-a-poly-dimethylsiloxane-catheter-material-and-a-bacterial-biofilm-resistant-acrylate-polymer-coating
#17
Bonnie J Tyler, Andrew Hook, Andreas Pelster, Paul Williams, Morgan Alexander, Heinrich F Arlinghaus
Catheter associated urinary tract infections are the most common health related infections worldwide, contributing significantly to patient morbidity and mortality and increased health care costs. To reduce the incidence of these infections, new materials that resist bacterial biofilm formation are needed. A composite catheter material, consisting of bulk poly(dimethylsiloxane) (PDMS) coated with a novel bacterial biofilm resistant polyacrylate [ethylene glycol dicyclopentenyl ether acrylate (EGDPEA)-co-di(ethyleneglycol) methyl ether methacrylate (DEGMA)], has been proposed...
May 23, 2017: Biointerphases
https://www.readbyqxmd.com/read/28535276/live-attenuated-pertussis-vaccine-bpze1-protects-baboons-against-b-pertussis-disease-and-infection
#18
Camille Locht, James F Papin, Sophie Lecher, Anne-Sophie Debrie, Marcel Thalen, Ken Solovay, Keith Rubin, Nathalie Mielcarek
Evidence suggests that the resurgence of pertussis in many industrialized countries may result from the failure of current vaccines to prevent nasopharyngeal colonization by Bordetella pertussis, the principal causative agent of whooping cough. Here, we used a baboon model to test the protective potential of the novel, live attenuated pertussis vaccine candidate BPZE1. A single intranasal/intratracheal inoculation of juvenile baboons with BPZE1 resulted in transient nasopharyngeal colonization and induction of IgG and IgA to all antigens tested, while causing no adverse symptoms or leukocytosis...
May 23, 2017: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/28533470/aeromonas-salmonicida-growth-in-response-to-atlantic-salmon-mucins-differ-between-epithelial-sites-is-governed-by-sialylated-and-n-acetylhexosamine-containing-o-glycans-and-is-affected-by-ca-2
#19
János Tamás Padra, Henrik Sundh, Kristina Sundell, Vignesh Venkatakrishnan, Chunsheng Jin, Tore Samuelsson, Niclas G Karlsson, Sara K Lindén
Aeromonas salmonicida cause furunculosis in salmonids and is a threat to Atlantic salmon aquaculture. The epithelial surfaces that the pathogen colonizes are covered by a mucus layer, predominantly comprised of secreted mucins. Using mass spectrometry to identify mucin glycan structures with and without enzymatic removal of glycan residues, coupled to measurements of bacterial growth, we here show that the complex Atlantic salmon intestinal mucin glycans enhance A. salmonicida growth, whereas the more simple skin mucin glycans do not...
May 22, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28533435/enzymatic-inactivation-of-endogenous-igg-by-ides-enhances%C3%A2-therapeutic-antibody-efficacy
#20
Sofia Järnum, Anna Runström, Robert Bockermann, Lena Winstedt, Max Crispin, Christian Kjellman
Endogenous plasma IgG sets an immunological threshold that dictates the activity of tumor-directed therapeutic antibodies. Saturation of cellular antibody receptors by endogenous antibody limits antibody-dependent cell-mediated cytotoxicity (ADCC) and antibody dependent cellular phagocytosis (ADCP). Here we show how enzymatic cleavage of IgG using the bacterial enzyme IdeS can be utilized to empty both high and low affinity Fcγ-receptors and clear the entire endogenous antibody pool. Using in vitro models, tumor animal models as well as ex vivo analysis of sera collected during a previous clinical trial with IdeS, we show how clearing of competing plasma antibody levels with IdeS unblocks cellular antibody receptors...
May 22, 2017: Molecular Cancer Therapeutics
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