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https://www.readbyqxmd.com/read/29334369/dual-gene-activation-and-knockout-screen-reveals-directional-dependencies-in-genetic-networks
#1
Michael Boettcher, Ruilin Tian, James A Blau, Evan Markegard, Ryan T Wagner, David Wu, Xiulei Mo, Anne Biton, Noah Zaitlen, Haian Fu, Frank McCormick, Martin Kampmann, Michael T McManus
Understanding the direction of information flow is essential for characterizing how genetic networks affect phenotypes. However, methods to find genetic interactions largely fail to reveal directional dependencies. We combine two orthogonal Cas9 proteins from Streptococcus pyogenes and Staphylococcus aureus to carry out a dual screen in which one gene is activated while a second gene is deleted in the same cell. We analyze the quantitative effects of activation and knockout to calculate genetic interaction and directionality scores for each gene pair...
January 15, 2018: Nature Biotechnology
https://www.readbyqxmd.com/read/29334249/antimicrobial-activity-of-1-3-4-oxadiazole-derivatives-against-planktonic-cells-and-biofilm-of-staphylococcus-aureus
#2
Zhaojun Zheng, Qingzhong Liu, Wooseong Kim, Nagendran Tharmalingam, Beth Burgwyn Fuchs, Eleftherios Mylonakis
AIM:  Staphylococcus aureus is a major cause of severe hospital-acquired infections, and biofilm formation is an important part of staphylococcal pathogenesis. Therefore, developing new antimicrobial agents against both planktonic cells and biofilm of S. aureus is a major challenge. RESULTS: Three 1,3,4-oxadiazole derivatives exhibited antimicrobial activity against seven S. aureus strains in vitro, with minimum inhibitory concentrations ranging from 4 to 32 μg/ml...
January 15, 2018: Future Medicinal Chemistry
https://www.readbyqxmd.com/read/29334239/antimicrobial-and-antiquorum-sensing-activity-of-ricinus-communis-extracts-and-ricinine-derivatives
#3
Mai H El-Naggar, Abdelaziz Elgaml, Fatma M Abdel Bar, Farid A Badria
Ricinine (1), a known major alkaloid in Ricinus communis plant, was used as a starting compound for the synthesis of six ricinine derivatives; two new and four known compounds. The new derivatives; 3-amino-5-methyl-1H-pyrazolo[4,3-c]pyridin-4(5H)-one (2), and 3-amino-5-methyl-1-(phenylsulfonyl)-1H-pyrazolo[4,3-c]pyridin-4(5H)-one (3), as well as the previously prepared derivatives (4-7) were subjected for antimicrobial and antiquorum-sensing evaluation in comparison to different R. communis extracts. Acetyl ricininic acid derivative (5) showed the highest antimicrobial activity among all tested derivatives against Staphylococcus aureus, Escherichia coli, Klebsiella pneumoniae, Pseudomonas aeuroginosa and Candida albicans...
January 15, 2018: Natural Product Research
https://www.readbyqxmd.com/read/29334195/exoproteome-profiling-reveals-the-involvement-of-the-foldase-prsa-in-the-cell-surface-properties-and-pathogenesis-of-staphylococcus-aureus
#4
Mei-Hui Lin, Chi-Chun Li, Jwu-Ching Shu, Hao-Wei Chu, Chao-Chin Liu, Chih-Ching Wu
Staphylococcus aureus is a bacterial pathogen that produces and exports many virulence factors that cause diseases in human. PrsA, a membrane-bound foldase, is expressed ubiquitously in Gram-positive bacteria and required for the folding of exported proteins into a stable and active structure. To understand the involvement of PrsA in post-translocational protein folding in S. aureus, a PrsA-deficient mutant of S. aureus HG001 was constructed. Using isobaric tags for relative and absolute quantification (iTRAQ)-based mass spectrometry analyses, the exoproteomes of PrsA mutant and wild type S...
January 15, 2018: Proteomics
https://www.readbyqxmd.com/read/29333818/community-acquired-methicillin-resistant-staphylococcus-aureus-infections-hospitalization-and-case-fatality-risk-in-10-pediatric-facilities-in-argentina
#5
Ángela Gentile, Julia Bakir, Gabriela Ensinck, Aldo Cancellara, Enrique V Casanueva, Verónica Firpo, Martín Caruso, María F Lución, Alejandro Santillán Iturres, Fabiana Molina, Héctor J Abate, Andrea Gajo Gane, Santiago López Papucci
INTRODUCTION: Community-acquired methicillin-resistant Staphylococcus aureus (CA-MRSA) infections are prevalent both in Argentina and worldwide, and they may have a severe clinical course. OBJECTIVES: To estimate the hospitalization rate and case fatality risk factors of CA-MRSA infection. METHODS: Cross-sectional, analytical study. All patients < 15 years old with community-acquired Staphylococcus aureus (CA-SA) infections admitted to 10 pediatric facilities between January 2012 and December 2014 were included...
February 1, 2018: Archivos Argentinos de Pediatría
https://www.readbyqxmd.com/read/29333608/the-synergistic-effect-of-pdt-and-oxacillin-on-clinical-isolates-of-staphylococcus-aureus
#6
Natanel Iluz, Yasmin Maor, Natan Keller, Zvi Malik
BACKGROUND: Staphylococcus aureus is a major pathogen in clinical microbiology. It is known to cause infections at various body sites and can be life-threatening. The development of resistance to many well-established antibiotic treatments and the prevalence of methicillin-resistant S. aureus (MRAS) among hospital patients and the general community pose challenges in treating the pathogen. The antimicrobial effect of photodynamic therapy (PDT) has been a subject of study for a long time and can offer new strategies for dealing with resistant strains...
January 15, 2018: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/29333490/inhibition-of-bacterial-adhesion-on-nanotextured-stainless-steel-316l-by-electrochemical-etching
#7
Yeongseon Jang, Won Tae Choi, Christopher T Johnson, Andrés J García, Preet M Singh, Victor Breedveld, Dennis W Hess, Julie A Champion
Bacterial adhesion to stainless steel 316L (SS316L), which is an alloy typically used in many medical devices and food processing equipment, can cause serious infections along with substantial healthcare costs. This work demonstrates that nanotextured SS316L surfaces produced by electrochemical etching effectively inhibit bacterial adhesion of both Gram-negative Escherichia coli and Gram-positive Staphylococcus aureus, but exhibit cytocompatibility and no toxicity toward mammalian cells in vitro. Additionally, the electrochemical surface modification on SS316L results in formation of superior passive layer at the surface, improving corrosion resistance...
January 8, 2018: ACS Biomaterials Science & Engineering
https://www.readbyqxmd.com/read/29333051/therapeutic-significance-of-loligo-vulgaris-lamarck-1798-ink-extract-a-biomedical-approach
#8
Sri Kumaran Nadarajah, Radha Vijayaraj, Jayaprakashvel Mani
Background: The squid ink extract is well known for its biomedical properties. Objective: In this study, squid Loligo vulgaris was collected from Tuticorin costal water, Bay of Bengal, India. Materials and Methods: Proximate composition of the crude squid ink was studied and found to have protein as the major component over lipid and carbohydrates. Further, bioactive fractions of squid ink were extracted with ethanol, and therapeutic applications such as hemolytic, antioxidant, antimicrobial, and in vitro anti-inflammatory properties were analyzed using standard methods...
December 2017: Pharmacognosy Research
https://www.readbyqxmd.com/read/29332945/the-human-skin-microbiome
#9
REVIEW
Allyson L Byrd, Yasmine Belkaid, Julia A Segre
Functioning as the exterior interface of the human body with the environment, skin acts as a physical barrier to prevent the invasion of foreign pathogens while providing a home to the commensal microbiota. The harsh physical landscape of skin, particularly the desiccated, nutrient-poor, acidic environment, also contributes to the adversity that pathogens face when colonizing human skin. Despite this, the skin is colonized by a diverse microbiota. In this Review, we describe amplicon and shotgun metagenomic DNA sequencing studies that have been used to assess the taxonomic diversity of microorganisms that are associated with skin from the kingdom to the strain level...
January 15, 2018: Nature Reviews. Microbiology
https://www.readbyqxmd.com/read/29332612/a-colonization-outbreak-of-penicillin-susceptible-meca-positive-staphylococcus-aureus-in-a-neonatal-ward-of-children-s-hospital
#10
Kisei Minami, Runa Terakawa, Masanori Sato, Yasuhiro Shoji, Takehiko Hiroma, Tomohiko Nakamura, Ayaka Horiuchi, Ayaka Otsuka, Noriko Kubota, Eiko Hidaka, Yoshiyuki Kawakami, Meiji Soe Aung, Nobumichi Kobayashi
No abstract text is available yet for this article.
January 15, 2018: Infection Control and Hospital Epidemiology
https://www.readbyqxmd.com/read/29332251/clinical-pharmacokinetics-and-pharmacodynamics-of-telavancin-compared-with-the-other-glycopeptides
#11
REVIEW
Valentin Al Jalali, Markus Zeitlinger
Telavancin was discovered by modifying the chemical structure of vancomycin and belongs to the group of lipoglycopeptides. It employs its antimicrobial potential through two distinct mechanisms of action: inhibition of bacterial cell wall synthesis and induction of bacterial membrane depolarization and permeabilization. In this article we review the clinically relevant pharmacokinetic and pharmacodynamic data of telavancin. For comparison, the pharmacokinetic and pharmacodynamic data of the other glycopeptides are presented...
January 13, 2018: Clinical Pharmacokinetics
https://www.readbyqxmd.com/read/29331487/curecuma-cationic-curcuminoids-with-improved-properties-and-enhanced-antimicrobial-photodynamic-activity
#12
Andreas Spaeth, Andre Graeler, Tim Maisch, Kristjan Plaetzer
The naturally occurring photosensitizer curcumin has excellent biocompatibility, but its antimicrobial photodynamic efficacy is limited by (i) weak adherence to Gram(-) cell walls, (ii) low (photo-)stability and (iii) limited solubility in water. In this study novel curcuminoids bearing cationic substituents were prepared by different synthetic routes. The derivatives exhibit excellent water solubility, improved photostability and low aggregation. All novel curcuminoids showed antibacterial photodynamic effects (>3 log10 reduction of CFU) against Escherichia coli and Staphylococcus aureus upon blue light illumination...
October 21, 2017: European Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29331467/canadian-national-dairy-study-herd-level-milk-quality
#13
C A Bauman, H W Barkema, J Dubuc, G P Keefe, D F Kelton
The objective of this study was to estimate Canadian national milk quality parameters and estimate the bulk tank milk (BTM) prevalence of 4 mastitis pathogens, Staphylococcus aureus, Streptococcus agalactiae, Mycoplasma bovis, and Prototheca spp., on Canadian dairy farms. A questionnaire was sent to all Canadian dairy producers. Of the 1,062 producers who completed the questionnaire, 374 producers from across the country were visited and milking hygiene was assessed. Farm-level milk quality data for all Canadian dairy producers was collected from the provincial marketing boards and combined with the questionnaire and farm visit data...
January 10, 2018: Journal of Dairy Science
https://www.readbyqxmd.com/read/29331370/preparation-and-evaluation-of-antibacterial-potential-of-pithecellobium-dulce-root-extract-against-gram-positive-and-gram-negative-bacteria
#14
Muneer Ahmad Bhat, Rayees Ahmad Malik, Poonam Prakash, Ali Mohd Lone
In the present study hexane, benzene, ethyl acetate and ethanol extracts of Pithecellobium dulce root were prepared using soxhlet extractor. The extracts were evaluated for antibacterial activity against one Gram positive (Staphylococcus aureus) and three Gram negative (Acetobacter aceti, Acetobacter aceti, Klebsiella pneumoniae) strains. Disc diffusion method revealed promising antibacterial activity of the extracts prepared in polar solvents (ethyl acetate and ethanol) compared to non-polar solvents (hexane and benzene)...
January 10, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29331369/equisetum-telmateia-extracts-chemical-compositions-antioxidant-activity-and-antimicrobial-effect-on-the-growth-of-some-pathogenic-strain-causing-poisoning-and-infection
#15
Marzie Yeganegi, Farideh Tabatabaei Yazdi, Seyed Ali Mortazavi, Javad Asili, Behrooz Alizadeh Behbahani, Adel Beig Babaei
The aerial parts of Equisetum telmateia have been used as a source of biologically active compounds to treat inflammatory, diarrhea, stomach-ache, eczema and mouth infections in traditional medicine. The aim of this work is to evaluate the extraction yield, chemical compositions, antioxidant activity and antimicrobial activity of E. telmateia extracts on Staphylococcus aureus, Bacillus cereus, Escherichia coli, Salmonella typhi and Candida albicans. Chemical compositions E. telmateia was analyzed by high performance liquid chromatography (HPLC) using a C18 column...
January 10, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29330994/pattern-of-causative-micro-organisms-in-catheter-related-blood-stream-infections-in-dialysis-patients-experience-from-saudi-arabia
#16
Bilal Mohsin
BACKGROUND: Catheter related blood stream infections (CRBSI) are the leading cause of morbidity in HD patients. The majority of these infections relate to haemodialysis catheters. There is a paucity of local data on microbial agents responsible for CRBSI in our region. This prompted our study. METHODS: This Prospective observatory survey was conducted in Department of Nephrology, King Fahd Hospital, Hofuf KSA from Nov 2014 to Jan 2017 (26 months). It was performed on dialysis patients with HD catheters who developed features of CRBSI...
October 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/29330988/microbiological-profile-from-middle-ear-and-nasopharynx-in-patients-suffering-from-chronic-active-mucosal-otitis-media
#17
Shahid Farooq Khattak, Nadeem Ahmed Sheikh, Adil Aleem, Muhammad Farooq, Kanwal Nadeem
BACKGROUND: Chronic otitis media is described as a tympanic membrane perforation and ear discharge for more than six weeks duration. Ascending infection from the nasopharynx into the middle ear cleft has been attributed to prevent resolution of chronic otitis media. This research aims to determine the association between the microbiological flora of the nasopharynx with that of the middle ear in patients suffering from chronic (active) mucosal otitis media.. METHODS: Our study is a hospital-based cross-sectional survey...
October 2017: Journal of Ayub Medical College, Abbottabad: JAMC
https://www.readbyqxmd.com/read/29330346/underestimation-of-staphylococcus-aureus-mrsa-and-mssa-carriage-associated-with-standard-culturing-techniques-one-third-of-carriers-missed
#18
S T J Tsang, M P McHugh, D Guerendiain, P J Gwynne, J Boyd, A H R W Simpson, T S Walsh, I F Laurenson, K E Templeton
OBJECTIVES: Nasal carriers of Staphylococcus (S.) aureus (MRSA and MSSA) have an increased risk for healthcare-associated infections. There are currently limited national screening policies for the detection of S. aureus despite the World Health Organization's recommendations. This study aimed to evaluate the diagnostic performance of molecular and culture techniques in S. aureus screening, determine the cause of any discrepancy between the diagnostic techniques, and model the potential effect of different diagnostic techniques on S...
January 2018: Bone & Joint Research
https://www.readbyqxmd.com/read/29330116/tnf-%C3%AE-increases-staphylococcus-aureus-induced-death-of-human-alveolar-epithelial-cell-line-a549-associated-with-rip3-mediated-necroptosis
#19
Shun-Hang Wen, Luo-Na Lin, Hu-Jun Wu, Lu Yu, Li Lin, Li-Li Zhu, Hai-Yan Li, Hai-Lin Zhang, Chang-Chong Li
AIM: To explore the role of tumor necrosis factor-alpha (TNF-α) on Staphylococcus aureus-induced necroptosis in alveolar epithelial cells. MAIN METHODS: The A549 alveolar epithelial cell line was pretreated with small interfering RNA (siRNA) against receptor interacting protein-3 (RIP3) and then stimulated by S. aureus, where some cells were pretreated with TNF-α or TNF-α with anti-TNF-α antibody simultaneously. A549 cell death was assessed using lactate dehydrogenase (LDH) leakage and flow cytometry analyses...
January 9, 2018: Life Sciences
https://www.readbyqxmd.com/read/29330061/forsythoside-a-inhibited-s-aureus-stimulated-inflammatory-response-in-primary-bovine-mammary-epithelial-cells
#20
Jiali Zhang, Yue Zhang, Hailong Huang, Haiwei Zhang, Wei Lu, Guoqun Fu, Yunzhang Zhu
Forsythoside A (FTA), the major bioactive component extracted from Forsythiae fructus, has multiple biological properties especially anti-inflammatory property. Staphylococcus aureus (S. aureus), a Gram-positive organism, is one of most common pathogens that cause bovine mastitis. This study evaluated the anti-inflammatory effect of FTA in S. aureus-stimulated primary bovine mammary epithelial cells (bMEC). Primary bovine mammary epithelial cells were isolated from the mammary tissue of lactating cows and identified as bMEC...
January 9, 2018: Microbial Pathogenesis
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