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Staphyloccocus aureus

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https://www.readbyqxmd.com/read/29045693/pharmacokinetics-of-ceftaroline-in-a-preterm-infant-with-methicillin-resistant-staphylococcus-aureus-pneumonia
#1
Sara N Salerno, Janice Bernhardt, Matthew Laughon, Ravi Jhaveri, Matthew Massaro, Daniel Gonzalez
We report here the first pharmacokinetic-pharmacodynamic relationship for ceftaroline in a preterm infant born at <28 weeks' gestational age who was given ceftaroline (8.5 mg/kg every 8 hours) for pneumonia attributable to methicillin-resistant Staphyloccocus aureus. This dose of ceftaroline was adequate to achieve the pharmacodynamic endpoint associated with efficacy for methicillin-resistant Staphyloccocus aureus.
October 16, 2017: Journal of the Pediatric Infectious Diseases Society
https://www.readbyqxmd.com/read/29020181/a-healthcare-improvement-intervention-combining-nucleic-acid-microarray-testing-with-direct-physician-response-for-management-of-staphyloccocus-aureus-bacteremia
#2
Joshua C Eby, Morgan M Richey, James A Platts-Mills, Amy J Mathers, Wendy M Novicoff, Heather L Cox
Background: Nucleic acid microarray (NAM) testing for detection of Staphylococcus aureus bacteremia (SAB) and S. aureus resistance gene determinants can reduce time to targeted antibiotic administration. Evidence-based management of SAB includes bedside Infectious Diseases (ID) consultation. As a healthcare improvement initiative at our institution, with the goal of improving management and outcomes for subjects with SAB, we implemented NAM with a process for responding to positive NAM results by directly triggered, mandatory ID consultation...
August 17, 2017: Clinical Infectious Diseases: An Official Publication of the Infectious Diseases Society of America
https://www.readbyqxmd.com/read/28916359/a-class-b-scavenger-receptor-from-eriocheir-sinensis-essr-b1-restricts-bacteria-proliferation-by-promoting-phagocytosis
#3
Yao-Meng Wu, Lei Yang, Xue-Jie Li, Lu Li, Qun Wang, Wei-Wei Li
Scavenger receptors (SRs) are important pattern recognition receptors (PRRs), which play significant roles in host defense against pathogens by identifying pathogen-associated molecular patterns (PAMPs). In this study, we report the cloning and characterization of a SR from Eriocheir sinensis (EsSR-B1) which is a 500 amino acid protein encoded by a gene comprised of 2726 nucleotides with a 1503 bp open reading frame. The domains of EsSR-B1 were found to be evolutionarily conserved. EsSR-B1 was widely detected in different tissues of E...
September 13, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28756021/association-of-clinical-severity-of-cystic-fibrosis-with-variants-in-the-slc-gene-family-slc6a14-slc26a9-slc11a1-and-slc9a3
#4
Stéphanie Villa-Nova Pereira, José Dirceu Ribeiro, Carmen Sílvia Bertuzzo, Fernando Augusto Lima Marson
INTRODUCTION: Cystic fibrosis (CF) manifests with clinical and histopathological variability depending on environmental and genetic factors. Moreover, the genes encoding ion channels[rs3788766(SLC6A14), rs7512462(SLC26A9), rs17235416(SLC11A1) and rs17563161(SLC9A3)] have been insufficiently studied as modifier genes. Then, our objective was associate the variants in the genes of SLC family with 43 CF severity markers. METHODS: The variants were identified by real-time-PCR in 188 CF patients considering the CFTR genotype...
September 20, 2017: Gene
https://www.readbyqxmd.com/read/28745896/carboxymethylpullulan-grafted-with-aminoguaiacol-synthesis-characterization-and-assessment-of-antibacterial-and-antioxidant-properties
#5
Marie-Carole Kouassi, Pascal Thébault, Christophe Rihouey, Emmanuelle Dé, Béatrice Labat, Luc Picton, Virginie Dulong
Aminoguaiacol, the aminated derivative of guaiacol, a natural phenolic compound, was chemically grafted onto a polysaccharide (carboxymethylpullulan, CMP) in the presence of the activator agent 1-ethyl-3-(3-(dimethylamino)propyl)carbodiimide hydrochloride (EDCI). The grafted polysaccharides were characterized by FTIR and (1)H NMR spectroscopy to confirm and quantify the grafting. All polysaccharide derivatives (grafting rates of aminoguaiacol between 16% and 58%) were soluble in water. Their physicochemical properties were studied in a dilute regime and a semidilute regime by light scattering, fluorescence, and rheology, showing associative properties with peculiar polysoap behavior...
September 1, 2017: Biomacromolecules
https://www.readbyqxmd.com/read/28647424/self-disinfecting-surfaces-and-activity-against-staphyloccocus-aureus-atcc-6538-under-real-life-conditions
#6
C Brühwasser, H Heinrich, C Lass-Flörl, A Mayr
Environmental surface contamination provides a potential reservoir for pathogens to cause infections. As such, self-disinfecting surfaces have been developed to possibly reduce exogenous transmission. Five different self-disinfecting surfaces were evaluated for activity against Staphylococcus aureus ATCC 6538 under real-life conditions using the dry inoculation method. Various antimicrobial effects were detected. However, following disinfection with alcoholic wipes, these effects disappeared. Further development is necessary to produce self-disinfecting surfaces that are stable in the presence of hospital disinfectants, as it is impossible to guarantee that self-disinfecting surfaces in healthcare settings will not be exposed to disinfectants...
June 22, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28494339/application-of-protein-a-modified-capillary-channeled-polymer-polypropylene-fibers-to-the-quantitation-of-igg-in-complex-matrices
#7
Hung K Trang, R Kenneth Marcus
Polypropylene (PP) capillary-channeled polymer (C-CP) fibers loaded with recombinant Staphyloccocus aureus protein A (rSPA) were used as an affinity chromatography stationary phase for the quantitation of immunoglobulin G (IgG) in complex biological matrices. Optimization of the chromatographic method regarding mobile phase components and load/elution conditions was performed. The six-minute analysis, including a load step with 12mM phosphate at pH 7.4, an elution step with 0.025% phosphoric acid and a re-equilibration step, was employed for quantitation of IgG1 from 0...
April 22, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28466356/recurrent-otorrhea-in-chronic-suppurative-otitis-media-is-biofilm-the-missing-link
#8
Ramon Gordon Jensen, Helle Krogh Johansen, Thomas Bjarnsholt, Steffen Robert Eickhardt-Sørensen, Preben Homøe
Dispersal of bacteria from a biofilm in the middle ear, serving as a bacterial reservoir, could explain the recurrent and chronic nature of chronic suppurative otitis media (CSOM). The objective of this study is to investigate if the same strains of bacteria could be detected in repeated episodes of otorrhea in CSOM. In a prospective case series at a primary healthcare clinic in Nuuk, Greenland, patients with more than 14 days of otorrhea were included consecutively. Samples for culturing and biofilm analysis were taken at enrollment and at any subsequent episode with otorrhea...
July 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28459996/the-role-of-p38-mapk-jnk-and-erk-in-antibacterial-responses-of-chilo-suppressalis-lepidoptera-crambidae
#9
Lin Qiu, Boyao Zhang, Lang Liu, Xiaoping Wang, Chaoliang Lei, Yongjun Lin, Jing Zhao, Weihua Ma
The mitogen-activated protein kinases (MAPKs) are conserved signal transduction pathways and broadly responsible for bacterial infection from yeast to mammals, and virus, fungi, and bacteria, specifically Bacillus thuringiensis, to insects. But little is known about the MAPK pathways in antibacterial responses in Chilo suppressalis (Walker), an important lepidopteran pest of rice. In this study, we used the bacteria of Bacillus thuringiensis, Escherichia coli, and Staphyloccocus aureus to infect C. suppressalis larvae, and the responses of MAPK pathways were analyzed...
August 1, 2017: Journal of Economic Entomology
https://www.readbyqxmd.com/read/28379505/the-rna-targetome-of-staphylococcus-aureus-non-coding-rna-rsaa-impact-on-cell-surface-properties-and-defense-mechanisms
#10
Arnaud Tomasini, Karen Moreau, Johana Chicher, Thomas Geissmann, François Vandenesch, Pascale Romby, Stefano Marzi, Isabelle Caldelari
The virulon of Staphyloccocus aureus is controlled by intricate connections between transcriptional and post-transcriptional regulators including proteins and small non-coding RNAs (sRNAs). Many of the sRNAs regulate gene expression through base-pairings with mRNAs. However, characterization of the direct sRNA targets in Gram-positive bacteria remained a difficult challenge. Here, we have applied and adapted the MS2-affinity purification approach coupled to RNA sequencing (MAPS) to determine the targetome of RsaA sRNA of S...
June 20, 2017: Nucleic Acids Research
https://www.readbyqxmd.com/read/28365385/molecular-characterization-and-antibacterial-activity-of-a-phage-type-lysozyme-from-the-manila-clam-ruditapes-philippinarum
#11
Dinglong Yang, Qing Wang, Lizhu Chen, Yongliang Liu, Ruiwen Cao, Huifeng Wu, Fei Li, Chenglong Ji, Ming Cong, Jianmin Zhao
A phage-type lysozyme, designed as RpPLYZ, was cloned and characterized from the clam Ruditapes philippinarum. The full-length cDNA of RpPLYZ was of 699 bp with an open reading frame (ORF) of 534 bp, encoding a polypeptide of 177-amino acid with a calculated molecular mass of 19.6 kDa and an isoelectric point of 9.05. Multiple alignments and phylogenetic analysis strongly suggested that RpPLYZ was a new member of the phage-type lysozyme family. The mRNA transcript of RpPLYZ was found to be constitutively expressed in a wide range of tissues and mainly in hemocytes and mantle...
March 30, 2017: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/28135800/dual-mode-of-action-for-plusbacin-a3-in-staphylococcus-aureus
#12
Robert D O'Connor, Manmilan Singh, James Chang, Sung Joon Kim, Michael VanNieuwenhze, Jacob Schaefer
We have used C{F}, N{F}, and N{P} rotational-echo double resonance NMR to determine the location and conformation of (19)F and (15)N double-labeled plusbacin A3 and of double-labeled deslipo-plusbacin A3, each bound to the cell walls of whole cells of Staphyloccocus aureus grown in media containing [1-(13)C]glycine. The (31)P is primarily in wall teichoic acid. Approximately 25% of plusbacin headgroups (the cyclic depsipeptide backbone) are in a closed conformation (N-F separation of 6 Å), while 75% are in a more open conformation (N-F separation of 12 Å)...
February 23, 2017: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/28117265/the-extracellular-adherence-protein-eap-of-staphylococcus-aureus-acts-as-a-proliferation-and-migration-repressing-factor-that-alters-the-cell-morphology-of-keratinocytes
#13
Janina Eisenbeis, Henrik Peisker, Christian S Backes, Stephanie Bur, Sebastian Hölters, Nicolas Thewes, Markus Greiner, Christian Junker, Eva C Schwarz, Markus Hoth, Kerstin Junker, Klaus T Preissner, Karin Jacobs, Mathias Herrmann, Markus Bischoff
Staphyloccocus aureus is a major human pathogen and a common cause for superficial and deep seated wound infections. The pathogen is equipped with a large arsenal of virulence factors, which facilitate attachment to various eukaryotic cell structures and modulate the host immune response. One of these factors is the extracellular adherence protein Eap, a member of the "secretable expanded repertoire adhesive molecules" (SERAM) protein family that possesses adhesive and immune modulatory properties. The secreted protein was previously shown to impair wound healing by interfering with host defense and neovascularization...
February 2017: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/28045495/bacterial-networks-on-hydrophobic-micropillars
#14
Zeinab Jahed, Hamed Shahsavan, Mohit S Verma, Jacob L Rogowski, Brandon B Seo, Boxin Zhao, Ting Y Tsui, Frank X Gu, Mohammad R K Mofrad
Bacteria have evolved as intelligent microorganisms that can colonize and form highly structured and cooperative multicellular communities with sophisticated singular and collective behaviors. The initial stages of colony formation and intercellular communication are particularly important to understand and depend highly on the spatial organization of cells. Controlling the distribution and growth of bacterial cells at the nanoscale is, therefore, of great interest in understanding the mechanisms of cell-cell communication at the initial stages of colony formation...
January 9, 2017: ACS Nano
https://www.readbyqxmd.com/read/27803487/improvement-of-predictivity-of-teicoplanin-serum-trough-concentrations-at-steady-state-calculated-by-vancomycin-pharmacokinetic-parameter
#15
Ryo Kobayashi, Shinya Otomo, Yusuke Shiba, Keiichi Ebinuma, Toshiaki Sudoh
 According to a recent study and meta-analysis, trough levels of >10 μg/mL teicoplanin (TEIC) may be acceptable for the treatment of uncomplicated infection, but no method of TEIC personalized medicine has been established. Vancomycin (VCM) and TEIC are glycopeptide antibiotic agents effective against methicillin-resistance Staphyloccocus aureus. This study aimed to establish TEIC personalized medicine at a steady state calculated by VCM pharmacokinetic parameters. Bayesian forecasting and population mean methods were employed to estimate individual total VCM clearance (CL) using existing population pharmacokinetics (PPK) parameter, and the differences between the CL calculated by these two methods were defined as ΔCL...
2016: Yakugaku Zasshi: Journal of the Pharmaceutical Society of Japan
https://www.readbyqxmd.com/read/27731830/detection-of-antibiotic-residues-in-poultry-meat
#16
Abdul Sajid, Natasha Kashif, Nasira Kifayat, Shabeer Ahmad
The antibiotic residues in poultry meat can pose certain hazards to human health among them are sensitivity to antibiotics, allergic reactions, mutation in cells, imbalance of intestinal micro biota and bacterial resistance to antibiotics. The purpose of the present paper was to detect antibiotic residue in poultry meat. During the present study a total of 80 poultry kidney and liver samples were collected and tested for detection of different antibiotic residues at different pH levels Eschericha coli at pH 6, 7 and Staphyloccocus aureus at pH 8 & 9...
September 2016: Pakistan Journal of Pharmaceutical Sciences
https://www.readbyqxmd.com/read/27552087/host-guest-self-assembly-toward-reversible-thermoresponsive-switching-for-bacteria-killing-and-detachment
#17
Zhen-Qiang Shi, Yu-Ting Cai, Jie Deng, Wei-Feng Zhao, Chang-Sheng Zhao
A facile method to construct reversible thermoresponsive switching for bacteria killing and detachment was currently developed by host-guest self-assembly of β-cyclodextrin (β-CD) and adamantane (Ad). Ad-terminated poly(N-isopropylacrylamide) (Ad-PNIPAM) and Ad-terminated poly[2-(methacryloyloxy)ethyl]trimethylammonium chloride (Ad-PMT) were synthesized via atom transfer radical polymerization, and then assembled onto the surface of β-CD grafted silicon wafer (SW-CD) by simply immersing SW-CD into a mixed solution of Ad-PNIPAM and Ad-PMT, thus forming a thermoresponsive surface (SW-PNIPAM/PMT)...
September 14, 2016: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/27530662/coatx-ii-a-new-dimeric-lys49-phospholipase-a2-from-crotalus-oreganus-abyssus-snake-venom-with-bactericidal-potential-insights-into-its-structure-and-biological-roles
#18
J R Almeida, M Lancellotti, A M Soares, L A Calderon, D Ramírez, W González, S Marangoni, S L Da Silva
Snake venoms are rich and intriguing sources of biologically-active molecules that act on target cells, modulating a diversity of physiological functions and presenting promising pharmacological applications. Lys49 phospholipase A2 is one of the multifunctional proteins present in these complex secretions and, although catalytically inactive, has a variety of biological activities, including cytotoxic, antibacterial, inflammatory, antifungal activities. Herein, a Lys49 phospholipase A2, denominated CoaTx-II from Crotalus oreganus abyssus, was purified and structurally and pharmacologically characterized...
September 15, 2016: Toxicon: Official Journal of the International Society on Toxinology
https://www.readbyqxmd.com/read/27492507/long-term-effects-of-azithromycin-in-patients-with-cystic-fibrosis
#19
Clémentine Samson, Aline Tamalet, Hoang Vu Thien, Jessica Taytard, Caroline Perisson, Nadia Nathan, Annick Clement, Pierre-Yves Boelle, Harriet Corvol
BACKGROUND: Low-dose azithromycin has beneficial effects on severity of the lung disease in cystic fibrosis (CF) patients for a period of 6-12 months after initiation of the treatment. Although its impact in the longer term is uncertain, this treatment is frequently used chronically. The aim of this retrospective study was to investigate the effects of low-dose azithromycin treatment on the progression of CF lung disease in patients treated for more than 12 months. METHODS: All of the CF patients followed in our pediatric center and who had been on low-dose azithromycin for more than 12 sequential months were included...
August 2016: Respiratory Medicine
https://www.readbyqxmd.com/read/27457409/multicomponent-petasis-borono-mannich-preparation-of-alkylaminophenols-and-antimicrobial-activity-studies
#20
Íris Neto, Joana Andrade, A S Fernandes, Catarina Pinto Reis, Jagadish K Salunke, Arri Priimagi, Nuno R Candeias, Patrícia Rijo
In this work we report the antibacterial activity of alkylaminophenols. A series of such compounds was prepared by a multicomponent Petasis-borono Mannich reaction starting from salicylaldehyde and its derivatives. The obtained compounds were tested against a large panel of microorganisms, Gram-positive and Gram-negative bacteria, and a yeast. Among the several tertiary amine derivatives tested, indoline-derived aminophenols containing a nitro group at the para-phenol position showed considerable activity against bacteria tested with minimal inhibitory concentrations as low as 1...
September 20, 2016: ChemMedChem
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