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https://www.readbyqxmd.com/read/28545064/transcriptomic-analysis-of-the-response-of-pseudomonas-fluorescens-to-epigallocatechin-gallate-by-rna-seq
#1
Xiaoxiang Liu, Bimiao Shen, Peng Du, Nan Wang, Jiaxue Wang, Jianrong Li, Aihua Sun
Epigallocatechin gallate (EGCG) is a main constituent of green tea polyphenols that are widely used as food preservatives and are considered to be safe for consumption. However, the underlying antimicrobial mechanism of EGCG and the bacterial response to EGCG are not clearly understood. In the present study, a genome-wide transcriptional analysis of a typical spoilage bacterium, Pseudomonas fluorescens that responded to EGCG was performed using RNA-seq technology. A total of 26,365,414 and 23,287,092 clean reads were generated from P...
2017: PloS One
https://www.readbyqxmd.com/read/28544960/anti-biofilm-effect-of-dihydromyricetin-loaded-nanocapsules-on-urinary-catheter-infected-by-pseudomonas-aeruginosa
#2
A J F Dalcin, C G Santos, S S Gündel, I Roggia, R P Raffin, A F Ourique, R C V Santos, P Gomes
Nosocomial infections associated with biofilm formation on urinary catheters are among the leading causes of complications due to biofilm characteristics and high antimicrobial resistance. An interesting alternative are natural products, such as Dihydromyricetin (DMY), a flavonoid which presents several pharmacological properties, including strong antimicrobial activity against various microorganisms. However, DMY, has low aqueous solubility and consequently low bioavailability. Nanoencapsulation can contribute to the improvement of characteristics of some drugs, by increasing the apparent solubility and sustained release has been reported among other advantages...
May 15, 2017: Colloids and Surfaces. B, Biointerfaces
https://www.readbyqxmd.com/read/28544570/relative-susceptibility-of-airway-organisms-to-antimicrobial-effects-of-nitric-oxide
#3
Alan D Workman, Ryan M Carey, Michael A Kohanski, David W Kennedy, James N Palmer, Nithin D Adappa, Noam A Cohen
BACKGROUND: Nitric oxide (NO) is released in the airway as a critical component of innate immune defense against invading pathogenic organisms. It is well documented that bacteriostatic and bactericidal effects of NO are concentration-dependent. However, few data exist comparing relative susceptibility of common pathogens to NO at physiologic concentrations. In this study we evaluated the effects of NO on 4 common airway bacteria and 1 fungus, and examined the potential implications of discrepancies in sensitivity...
May 25, 2017: International Forum of Allergy & Rhinology
https://www.readbyqxmd.com/read/28544416/global-analysis-of-strategies-to-tackle-antimicrobial-resistance
#4
Funke Adeniji
BACKGROUND: Antimicrobial resistance (AMR) is a global public health issue driven by inappropriate use of antimicrobials resulting in decreased efficacy on the background of an extremely limited pipeline for new antibiotics. We sought to analyse the effectiveness of key policies and strategies in tackling AMR globally and identify gaps in these. METHOD: The scope, magnitude, history and drivers of AMR were reviewed using supporting evidence. Our methodology included a literature review and semi-structured survey, whilst the analyses process was guided by an adapted health policy analyses framework...
May 22, 2017: International Journal of Pharmacy Practice
https://www.readbyqxmd.com/read/28542807/genetic-diversity-virulotyping-and-antimicrobial-resistance-susceptibility-of-yersinia-enterocolitica-isolated-from-pigs-and-porcine-products-in-malaysia
#5
Kwai Lin Thong, Lai Kuan Tan, Peck Toung Ooi
BACKGROUND: The objectives of this study were to determine the antimicrobial resistance, virulotypes and genetic diversity of Yersinia enterocolitica isolated from uncooked porcine food and live pigs in Malaysia. RESULTS: Thirty-two non-repeat Y. enterocolitica strains of three bioserotypes (3 variant/O:3, n=27; 1B/O:8, n=3; 1A/O:5, n=2) were analysed. About 90% of strains were multidrug-resistant with MAR index <0.2 and majority of the strains were resistant to nalidixic acid, clindamycin, ampicillin, ticarcillin, tetracycline and amoxicillin...
May 24, 2017: Journal of the Science of Food and Agriculture
https://www.readbyqxmd.com/read/28542602/antimicrobial-resistance-status-of-enterococcus-from-australian-cattle-populations-at-slaughter
#6
Robert S Barlow, Kate E McMillan, Lesley L Duffy, Narelle Fegan, David Jordan, Glen E Mellor
Antimicrobial agents are used in cattle production systems for the prevention and control of bacterial associated diseases. A consequence of their use is the potential development of antimicrobial resistance (AMR). Enterococcus faecium and Enterococcus faecalis that are resistant to antimicrobials are of increased concern to public health officials throughout the world as they may compromise the ability of various treatment regimens to control disease and infection in human medicine. Australia is a major exporter of beef; however it does not have an ongoing surveillance system for AMR in cattle or foods derived from these animals...
2017: PloS One
https://www.readbyqxmd.com/read/28542482/down-regulation-of-macrophage-ifngr1-exacerbates-systemic-l-monocytogenes-infection
#7
Emily M Eshleman, Christine Delgado, Staci J Kearney, Rachel S Friedman, Laurel L Lenz
Interferons (IFNs) target macrophages to regulate inflammation and resistance to microbial infections. The type II IFN (IFNγ) acts on a cell surface receptor (IFNGR) to promote gene expression that enhance macrophage inflammatory and anti-microbial activity. Type I IFNs can dampen macrophage responsiveness to IFNγ and are associated with increased susceptibility to numerous bacterial infections. The precise mechanisms responsible for these effects remain unclear. Type I IFNs silence macrophage ifngr1 transcription and thus reduce cell surface expression of IFNGR1...
May 22, 2017: PLoS Pathogens
https://www.readbyqxmd.com/read/28542412/low-rates-of-antibiotic-resistance-and-infectious-mortality-in-a-cohort-of-high-risk-hematology-patients-a-single-center-retrospective-analysis-of-blood-stream-infection
#8
Jason R Conn, Elizabeth M Catchpoole, Naomi Runnegar, Sally J Mapp, Kate A Markey
Febrile neutropenia (FN) is a medical emergency and can represent a life-threatening complication for hematology patients treated with intensive chemotherapy regimens. In clinical practice, the diagnostic yield of blood cultures and other investigations which aim to identify a causative organism or site of infection is low. We have retrospectively examined all blood cultures collected in a "real world" cohort of patients receiving chemotherapy for acute leukemia and patients with aggressive lymphoma treated with Hyper-CVAD/MTX-cytarabine, at a single tertiary center over a five-year period...
2017: PloS One
https://www.readbyqxmd.com/read/28542162/carbapenem-resistant-klebsiella-pneumoniae-in-barbados-driving-change-in-practice-at-the-national-level
#9
Corey Forde, Bryan Stierman, Pilar Ramon-Pardo, Thais Dos Santos, Nalini Singh
INTRODUCTION: Carbapenem-resistant Klebsiella pneumoniae (CRKP) is of growing concern globally. The risk for transmission of antimicrobial resistant organisms across several continents to the Caribbean is a real one given its tourism industry. After a cluster of cases of CRKP were detected, several studies detailed in this report were initiated to better characterize the problem. METHODS: A hospital-wide point prevalence study and active surveillance were performed at Queen Elizabeth Hospital (QEH) in Barbados in 2013 to assess the prevalence of CRKP infection/colonization...
2017: PloS One
https://www.readbyqxmd.com/read/28542093/feasibility-and-applicability-of-antimicrobial-stewardship-in-immunocompromised-patients
#10
Elizabeth Robilotti, Marisa Holubar, Susan K Seo, Stan Deresinski
PURPOSE OF REVIEW: Antimicrobial stewardship is the primary intervention in the battle against antimicrobial resistance, but clinicians do not always apply many key antimicrobial stewardship principles to patients with significant immune defects due to lack of data and fear of bad outcomes. We review evidence regarding the application of stewardship principles to immunocompromised patients, with a focus on solid organ and hematopoietic stem cell transplant recipients. RECENT FINDINGS: Antimicrobial stewardship programs (ASPs), targeting immunocompromised patient populations such as oncology and transplant, are gaining traction...
May 24, 2017: Current Opinion in Infectious Diseases
https://www.readbyqxmd.com/read/28541711/a-critical-review-on-ultrasensitive-spectroscopic-based-methods-for-high-throughput-monitoring-of-bacteria-during-infection-treatment
#11
Nicoleta Elena Dina, Alia Colniță, Tiberiu Szöke-Nagy, Alin Sebastian Porav
The world is in the midst of a pre-emptive public health emergency, one that is just as dramatic as the global aggressive viruses-related crises (Ebola, Zika, or SARS), but not as visible. The "superbugs" and their antimicrobial resistance (AMR) don't cause much public alarm or awareness, but provoke financial losses of $100 trillion annually [1] . This status quo review offers an overview of ultrasensitive methods for high-throughput monitoring of bacteria during infection treatment, the effects of antibiotics on bacteria at single-cell level and the challenges we will need to face in their detection due to the extraordinary capability of these "superbugs" to gain and constantly improve multiresistance to antibiotics...
May 25, 2017: Critical Reviews in Analytical Chemistry
https://www.readbyqxmd.com/read/28541467/global-epidemiology-of-ctx-m-%C3%AE-lactamases-temporal-and-geographical-shifts-in-genotype
#12
Edward R Bevan, Annie M Jones, Peter M Hawkey
Globally, rates of ESBL-producing Enterobacteriaceae are rising. We undertook a literature review, and present the temporal trends in blaCTX-M epidemiology, showing that blaCTX-M-15 and blaCTX-M-14 have displaced other genotypes in many parts of the world. Explanations for these changes can be attributed to: (i) horizontal gene transfer (HGT) of plasmids; (ii) successful Escherichia coli clones; (iii) ESBLs in food animals; (iv) the natural environment; and (v) human migration and access to basic sanitation...
May 25, 2017: Journal of Antimicrobial Chemotherapy
https://www.readbyqxmd.com/read/28540946/zinc-transporters-ybtx-and-znuabc-are-required-for-the-virulence-of-yersinia-pestis-in-bubonic-and-pneumonic-plague-in-mice
#13
Alexander G Bobrov, Olga Kirillina, Marina Y Fosso, Jacqueline D Fetherston, M Clarke Miller, Tiva T VanCleave, Joseph A Burlison, William K Arnold, Matthew B Lawrenz, Sylvie Garneau-Tsodikova, Robert D Perry
A number of bacterial pathogens require the ZnuABC Zinc (Zn(2+)) transporter and/or a second Zn(2+) transport system to overcome Zn(2+) sequestration by mammalian hosts. Previously we have shown that in addition to ZnuABC, Yersinia pestis possesses a second Zn(2+) transporter that involves components of the yersiniabactin (Ybt), siderophore-dependent iron transport system. Synthesis of the Ybt siderophore and YbtX, a member of the major facilitator superfamily, are both critical components of the second Zn(2+) transport system...
May 25, 2017: Metallomics: Integrated Biometal Science
https://www.readbyqxmd.com/read/28539918/the-sapa-protein-is-involved-in-resistance-to-antimicrobial-peptide-pr-39-and-virulence-of-actinobacillus-pleuropneumoniae
#14
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/28539745/effect-of-tamarindus-indica-l-and-manihot-esculenta-extracts-on-antibiotic-resistant-bacteria
#15
Zenon Machado Lima, Lenilson Santos da Trindade, Genelane Cruz Santana, Francine Ferreira Padilha, Marcelo da Costa Mendonça, Luiz Pereira da Costa, Jorge A López, Maria Lucila Hernández Macedo
BACKGROUND: The chemical composition of plants used in traditional medicine exhibits biologically active compounds, such as tannins, flavonoids, and alkaloids and becomes a promising approach to treat microbial infections, mainly with drug-resistant bacteria. OBJECTIVE: The aim of the present study was to evaluate the hydroethanolic leaf extracts of Tamarindus indica (tamarind) and Manihot esculenta (cassava) as antimicrobial potential against Pseudomonas aeruginosa clinical isolated and Methicillin-resistant Staphylococcus aureus...
April 2017: Pharmacognosy Research
https://www.readbyqxmd.com/read/28539723/antimicrobial-and-anti-inflammatory-effects-of-ethanol-extract-of-corylopsis-coreana-uyeki-flos
#16
Da-Eon Park, In-Soo Yoon, Jung-Eun Kim, Ji-Hye Seo, Jin-Cheol Yoo, Chun-Sik Bae, Chang-Dai Lee, Dae-Hun Park, Seung-Sik Cho
BACKGROUND: Corylopsis coreana Uyeki (Hamamelidaceae) is a medicinal plant cultivated in Northeast Asia. Previously, we have reported that an ethanol extract of Corylopsis coreana Uyeki flos (ECCF) contains four active compounds with antioxidant activity. OBJECTIVE: The aim of this study was to investigate the antimicrobial spectrum against infectious bacteria and anti-inflammatory effect of ECCF in a mouse model of acute local inflammation. MATERIALS AND METHODS: In vitro antimicrobial susceptibility was evaluated using standard plate assay technique...
April 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28539715/antiprotozoal-antibacterial-and-antidiarrheal-properties-from-the-flowers-of-chiranthodendron-pentadactylon-and-isolated-flavonoids
#17
Fernando Calzada, Teresa Juárez, Normand García-Hernández, Miguel Valdes, Oscar Ávila, Lilian Yepez Mulia, Claudia Velázquez
BACKGROUND: Chiranthodendron pentadactylon Larreat. (Sterculiaceae) is a Mexican plant used in traditional medicine for the treatment of heart disease symptoms and infectious diarrhea. OBJECTIVE: To evaluate in vitro antiprotozoal and antibacterial activities and in vivo antidiarrheal activity from the flowers of C. pentadactylon using the extract, fractions, and major isolated flavonoids. MATERIALS AND METHODS: Bioassay-guided fractionation of the methanol extract of C...
April 2017: Pharmacognosy Magazine
https://www.readbyqxmd.com/read/28539599/callistemenonone-a-a-novel-dearomatic-dibenzofuran-type-acylphloroglucinol-with-antimicrobial-activity-from-callistemon-viminalis
#18
Yu-Qing Xiang, Hong-Xin Liu, Li-Yun Zhao, Zhi-Fang Xu, Hai-Bo Tan, Sheng-Xiang Qiu
A new acylphloroglucinol with a novel architecture including an unprecedented dearomatic dibenzofuran core, named callistemenonone A (1), was isolated from the leaves of Callistemon viminalis (Myrtaceae). The structure was fully characterized on the basis of extensive spectroscopic analysis, including UV, HRESIMS, as well as 1D and 2D NMR spectral data (HSQC, HMBC, and ROESY). The deduced structure represents the first example of a natural dibenzofuran with two phenyl moieties coupling through tertiary hydroxy and ketal carbons...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28539477/bacterial-colonization-and-succession-in-a-newly-opened-hospital
#19
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/28538851/-antimicrobial-sensitivity-of-the-environmental-microbiota-in-the-intensive-care-units-of-a-peruvian-hospital
#20
José Díaz-Tello, Jesús Rojas-Jaimes, Jimmy Ibarra-Trujillo, Delza Tárraga-Gonzales
The objective was to detect Gram-negative bacilli and Gram-positive cocci isolated from the environmental microbiota of the Intensive Care Unit (ICU) departments of Neonatology, Pediatrics, and Transplants (kidney, liver, and general) in a Lima hospital and determine their antimicrobial sensitivity. Eighty samples were obtained from inanimate surfaces using a wet swab. A total of 61 bacterial strains were identified, including Staphylococcus epidermis (46.0%), Alcaligenes sp. (21.3%), Pseudomonas aeruginosa (16...
January 2017: Revista Peruana de Medicina Experimental y Salud Pública
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