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https://www.readbyqxmd.com/read/28225165/the-contrasting-role-of-th17-immunity-in-human-health-and-disease
#1
Edwin Hoe, Jeremy Anderson, Jordan Nathanielsz, Zheng Quan Toh, Rachel Marimla, Anne Balloch, Paul V Licciardi
The human immune system is a tightly regulated network that protects the host from disease. An important aspect of this is the balance between pro-inflammatory Th17 cells and anti-inflammatory Treg cells in maintaining immune homeostasis. Foxp3+ Treg are critical for sustaining immune tolerance through IL-10 and TGF-β while RORγt+ Th17 cells promote immunopathology and auto-inflammatory diseases through the actions of IL-17A, IL-21 and IL-22. Therefore, the imbalance between Treg and Th17 cells can result in serious pathology in many organs and tissues in the body...
February 22, 2017: Microbiology and Immunology
https://www.readbyqxmd.com/read/28223386/surveillance-of-omadacycline-activity-tested-against-clinical-isolates-from-a-global-north-america-europe-latin-america-and-asia-western-pacific-collection-2010-2011
#2
Michael A Pfaller, Michael D Huband, Paul R Rhomberg, Robert K Flamm
Omadacycline is a broad spectrum aminomethylcycline in late-stage clinical development for acute bacterial skin and skin structure infections and community-acquired pneumonia as both an oral and intravenous, once-daily formulation. In this report omadacycline and comparators were tested against 69,246 non-duplicate bacterial isolates collected prospectively during 2010 and 2011 from medical centers in Asia-Pacific (11,397 isolates), Europe (23,490 isolates), Latin America (8,038 isolates) and North America (26,321 isolates)...
February 21, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28223347/intact-pneumococci-trigger-transcription-of-interferon-related-genes-in-human-monocytes-while-fragmented-autolyzed-bacteria-subvert-this-response
#3
Susann Skovbjerg, Rickard Nordén, Anna Martner, Ebba Samuelsson, Lars Hynsjö, Agnes E Wold
A peculiar trait of pneumococci (Streptococcus pneumoniae) is their propensity to undergo spontaneous lysis during stationary growth due to activation of the enzyme autolysin (LytA) that fragments the peptidoglycan cell wall. The fragments that are generated upon autolysis impair phagocytosis and reduce production of IL-12 and IFN-γ by human leukocytes in response to intact pneumococci, thereby impeding crucial host defenses. The objective was to identify additional monocyte genes whose transcription is induced by intact pneumococci, and subverted by autolyzed bacteria...
February 21, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28223069/evaluation-of-antibacterial-potential-and-toxicity-of-plant-volatile-compounds-using-new-broth-microdilution-volatilization-method-and-modified-mtt-assay
#4
Marketa Houdkova, Johana Rondevaldova, Ivo Doskocil, Ladislav Kokoska
With aim to develop effective proof-of-concept approach which can be used in a development of new preparations for the inhalation therapy, we designed a new screening method for simple and rapid simultaneous determination of antibacterial potential of plant volatiles in the liquid and the vapour phase at different concentrations. In addition, EVA (ethylene vinyl acetate) capmat™ as vapour barrier cover was used as reliable modification of thiazolyl blue tetrazolium bromide (MTT) assay for cytotoxicity testing of volatiles on microtiter plates...
February 18, 2017: Fitoterapia
https://www.readbyqxmd.com/read/28221753/structure-activity-relationships-of-the-competence-stimulating-peptides-csps-in-streptococcus-pneumoniae-reveal-motifs-critical-for-intra-group-and-cross-group-comd-receptor-activation
#5
Yifang Yang, Bimal Koirala, Lucia A Sanchez, Naiya R Phillips, Sally R Hamry, Yftah Tal-Gan
Streptococcus pneumoniae is a highly recombinogenic human pathogen that utilizes the competence stimulating peptide (CSP)-based quorum sensing (QS) circuitry to acquire antibiotic resistance genes from the environment and initiate its attack on the human host. Modulation of QS in this bacterium, either inhibition or activation, can therefore be used to attenuate S. pneumoniae infectivity and slow down pneumococcal resistance development. In this study we set to determine the molecular mechanism that drives CSP:receptor binding and identify CSP-based QS modulators with distinct activity profiles...
February 21, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28220445/in-vitro-and-in-vivo-antibacterial-effect-of-nz2114-against-streptococcus-suis-type-2-infection-in-mice-peritonitis-models
#6
Jian Jiao, Ruoyu Mao, Da Teng, Xiumin Wang, Ya Hao, Na Yang, Xiao Wang, Xingjun Feng, Jianhua Wang
NZ2114 is a promising candidate for therapeutic application owing to potent activity to gram-positive bacterium such as Streptococcus pneumoniae and Staphylococcus aureus. This work is the first report to describe the in vitro and in vivo antibacterial characteristics of NZ2114 against Streptococcus suis. It exhibited strong antimicrobial activity against S. suis type 2 strains CVCC 606, CVCC 3309, and CVCC 3928 at a low minimal inhibitory concentration (MIC) of 0.03-0.06 μM. The NZ2114 killed over 99.9% of tested S...
December 2017: AMB Express
https://www.readbyqxmd.com/read/28219188/-change-of-prognosis-and-pathogens-in-adult-patients-with-severe-community-acquired-pneumonia-during-different-periods
#7
L Zhang, P Ning, F Rong, Z C Gao
Objective: To compare the change of prognosis and pathogens of adult patients with severe community-acquired pneumonia (CAP) requiring admission to Respiratory Intensive Care Unit (RICU) during different period, and estimate the risk factors of severe CAP. Methods: The clinical data of 186 patients with severe CAP admission to RICU was collected and assessed the trend in outcomes of these patients during three time periods: Period Ⅰ (January 1 2000 to October 31 2006), Period Ⅱ (November 1 2006 to December 31 2010), and Period Ⅲ (January 1 2011 to December 31 2015), analyzed the risk factors by Cox Proportional Hazards regression, and compared the pathogens detection...
February 7, 2017: Zhonghua Yi Xue za Zhi [Chinese medical journal]
https://www.readbyqxmd.com/read/28215918/molecular-detection-of-genes-responsible-for-macrolide-resistance-among-streptococcus-pneumoniae-isolated-in-north-lebanon
#8
Salam El Ashkar, Marwan Osman, Rayane Rafei, Hassan Mallat, Marcel Achkar, Fouad Dabboussi, Monzer Hamze
In recent years, the increased use of macrolides was linked with the emergence of resistance Streptococcus pneumoniae worldwide. The main aim of this study was to determine the prevalence of S. pneumoniae resistant to macrolides and to identify the macrolide resistance genotypes among clinical isolates collected in North Lebanon. Disk diffusion susceptibility method was performed for 132 strains of S. pneumoniae isolated over a period of 5 years in North Lebanon. Polymerase Chain Reaction followed by pyrosequencing was carried out for confirmation of phenotypic diagnosis...
February 16, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28215915/serotype-distribution-and-antimicrobial-susceptibility-of-streptococcus-pneumoniae-isolates-from-adult-patients-in-jakarta-indonesia
#9
Wahyu Finasari Said, Edy Sukoto, Miftahuddin Majid Khoeri, July Kumalawati, Dodi Safari
Currently, the data on pneumococcal invasive disease in the Indonesian population are limited. In this study, we investigated the serotype distribution and antimicrobial susceptibility of Streptococcus pneumoniae. These samples were isolated from the sputum of adult patients with non-specific clinical symptoms aged 18-87 years in Jakarta, Indonesia, from August to October 2014. Of the 349 sputum specimens, thirteen isolates were identified as S. pneumoniae strains (4%), with two strains each for serotype 19F, 3, and 15A, and one strain each for serotype/serogroup 13, 23A, 6, 34, 17F, 16F, and untypeable...
February 16, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/28212095/identifying-bacterial-essential-genes-based-on-a-feature-integrated-method
#10
Yan Lin, Fa-Zhan Zhang, Kai Xue, Yi-Zhou Gao, Feng-Biao Guo
Essential genes are those genes of an organism that are considered to be crucial for its survival. Identification of essential genes is therefore of great significance to advance our understanding of the principles of cellular life. We have developed a novel computational method, which can effectively predict bacterial essential genes by extracting and integrating homologous features, protein domain feature, gene intrinsic features and network topological features. By performing the principal component regression (PCR) analysis for Escherichia coli MG1655, we established a classification model with the average area under curve (AUC) value of 0...
February 15, 2017: IEEE/ACM Transactions on Computational Biology and Bioinformatics
https://www.readbyqxmd.com/read/28211009/pneumococcal-predictive-proteins-selected-by-microbial-genomic-approach-are-serotype-cross-reactive-and-bind-to-host-extracellular-matrix-proteins
#11
Ana Paula Corrêa Argondizzo, Cláudio Marcos Rocha-de-Souza, Marta de Almeida Santiago, Ricardo Galler, Joice Neves Reis, Marco Alberto Medeiros
Streptococcus pneumoniae is a colonizer of the human nasopharynx, which accounts for most of the community-acquired pneumonia cases and can cause non-invasive and invasive diseases. Current available vaccines are serotype-specific and the use of recombinant proteins associated with virulence is an alternative to compose vaccines and to overcome these problems. In a previous work, we describe the identification of proteins in S. pneumoniae by reverse vaccinology and the genetic diversity of these proteins in clinical isolates...
February 17, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28210633/potential-usefulness-of-streptococcus-pneumoniae-extracellular-membrane-vesicles-as-antibacterial-vaccines
#12
Chi-Won Choi, Edmond Changkyun Park, Sung Ho Yun, Sang-Yeop Lee, Seung Il Kim, Gun-Hwa Kim
The secretion of extracellular membrane vesicles (EMVs) is a common phenomenon that occurs in archaea, bacteria, and mammalian cells. The EMVs of bacteria play important roles in their virulence, biogenesis mechanisms, and host cell interactions. Bacterial EMVs have recently become the focus of attention because of their potential as highly effective vaccines that cause few side effects. Here, we isolated the EMVs of Streptococcus pneumoniae and examined their potential as new vaccine candidates. Although the S...
2017: Journal of Immunology Research
https://www.readbyqxmd.com/read/28209832/complete-genome-sequences-of-three-multidrug-resistant-clinical-isolates-of-streptococcus-pneumoniae-serotype-19a-with-different-susceptibilities-to-the-myxobacterial-metabolite-carolacton
#13
Jannik Donner, Boyke Bunk, Isabel Schober, Cathrin Spröer, Simone Bergmann, Michael Jarek, Jörg Overmann, Irene Wagner-Döbler
The full-genome sequences of three drug- and multidrug-resistant Streptococcus pneumoniae clinical isolates of serotype 19A were determined by PacBio single-molecule real-time sequencing, in combination with Illumina MiSeq sequencing. A comparison to the genomes of other pneumococci indicates a high nucleotide sequence identity to strains Hungary19A-6 and TCH8431/19A.
February 16, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28209711/serotype-3-pneumococci-sequester-platelet-derived-human-thrombospondin-1-via-the-adhesin-and-immune-evasion-protein-hic
#14
Ulrike Binsker, Thomas P Kohler, Krystin Krauel, Sylvia Kohler, Johanna Habermeyer, Hansjörg Schwertz, Sven Hammerschmidt
Streptococcus pneumoniae serotype 3 strains emerge frequently within clinical isolates of invasive diseases. Bacterial invasion into deeper tissues is associated with colonization and immune evasion mechanisms. Thus, pneumococci express a versatile repertoire of surface proteins sequestering and interacting specifically with components of the human extracellular matrix and serum. Hic, a PspC-like pneumococcal surface protein possesses vitronectin and Factor H binding activity. Here, we show that heterologously expressed Hic domains interact, similar to the classical PspC molecule, with human matricellular thrombospondin-1 (hTSP-1)...
February 16, 2017: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/28207813/interacting-networks-of-resistance-virulence-and-core-machinery-genes-identified-by-genome-wide-epistasis-analysis
#15
Marcin J Skwark, Nicholas J Croucher, Santeri Puranen, Claire Chewapreecha, Maiju Pesonen, Ying Ying Xu, Paul Turner, Simon R Harris, Stephen B Beres, James M Musser, Julian Parkhill, Stephen D Bentley, Erik Aurell, Jukka Corander
Recent advances in the scale and diversity of population genomic datasets for bacteria now provide the potential for genome-wide patterns of co-evolution to be studied at the resolution of individual bases. Here we describe a new statistical method, genomeDCA, which uses recent advances in computational structural biology to identify the polymorphic loci under the strongest co-evolutionary pressures. We apply genomeDCA to two large population data sets representing the major human pathogens Streptococcus pneumoniae (pneumococcus) and Streptococcus pyogenes (group A Streptococcus)...
February 2017: PLoS Genetics
https://www.readbyqxmd.com/read/28205635/deciphering-the-distance-to-antibiotic-resistance-for-the-pneumococcus-using-genome-sequencing-data
#16
Fredrick M Mobegi, Amelieke J H Cremers, Marien I de Jonge, Stephen D Bentley, Sacha A F T van Hijum, Aldert Zomer
Advances in genome sequencing technologies and genome-wide association studies (GWAS) have provided unprecedented insights into the molecular basis of microbial phenotypes and enabled the identification of the underlying genetic variants in real populations. However, utilization of genome sequencing in clinical phenotyping of bacteria is challenging due to the lack of reliable and accurate approaches. Here, we report a method for predicting microbial resistance patterns using genome sequencing data. We analyzed whole genome sequences of 1,680 Streptococcus pneumoniae isolates from four independent populations using GWAS and identified probable hotspots of genetic variation which correlate with phenotypes of resistance to essential classes of antibiotics...
February 16, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28205429/-pneumococcal-arthritis-in-paediatric-population
#17
G Barbeito-Castiñeiras, M Guinda-Giménez, O Cores-Calvo, M Hernández-Blanco, F Pardo-Sánchez
OBJECTIVE: Cases of septic arthritis in paediatric population by Streptococcus pneumoniae in the Health Area of Santiago de Compostela (Spain) were reviewed. METHODS: A retrospective study from January 2005 to March 2014 was conducted for all S. pneumoniae isolates obtained from joint fluids in children. RESULTS: From the 7,416 joint fluids received in the Microbiology Department, 77 belonged to paediatric patients, and of these, only 8 had positive culture...
February 16, 2017: Revista Española de Quimioterapia: Publicación Oficial de la Sociedad Española de Quimioterapia
https://www.readbyqxmd.com/read/28202800/discovery-of-novel-pneumococcal-serotype-35d-a-natural-wcig-deficient-variant-of-serotype-35b
#18
K Aaron Geno, Jamil S Saad, Moon H Nahm
The pneumococcus (Streptococcus pneumoniae) remains a significant cause of morbidity and mortality, especially among those at the extremes of age. Its capsular polysaccharide is essential for systemic virulence. Over ninety serologically distinct pneumococcal capsular polysaccharides (serotypes) are recognized, but they are unequal in prevalence. Because antibodies against the capsule are protective, polysaccharide conjugate vaccines, which are constructed against the most prevalent serotypes, have made great reductions in pneumococcal disease caused by these serotypes...
February 15, 2017: Journal of Clinical Microbiology
https://www.readbyqxmd.com/read/28202116/-pathogens-of-infections-in-the-induction-period-of-childhood-acute-lymphoblastic-leukemia-and-drug-resistance-of-isolated-strains
#19
Zai-Sheng Chen, Ling Zheng, Yi-Qiao Chen, Jing-Hui Yang, Jian Li
OBJECTIVE: To investigate the infections occurring in the induction period of childhood acute lymphoblastic leukemia (ALL), the pathogens of the infections, and drug resistance of isolated strains. METHODS: A retrospective analysis was performed for the clinical data of 130 children with newly-diagnosed childhood ALL. Infections occurring during the induction chemotherapy, pathogenic strains, and drug-resistance spectrum were analyzed. RESULTS: The incidence rate of clinical infection and/or microbial infection reached 76...
February 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/28201637/reduced-th17-responses-to-streptococcus-pneumoniae-in-infection-prone-children-can-be-rescued-by-addition-of-innate-cytokines
#20
Saleem Basha, Ravinder Kaur, Tim R Mosmann, Michael E Pichichero
No abstract text is available yet for this article.
February 13, 2017: Journal of Infectious Diseases
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