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Staphylococcal biofilm

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https://www.readbyqxmd.com/read/29334249/antimicrobial-activity-of-1-3-4-oxadiazole-derivatives-against-planktonic-cells-and-biofilm-of-staphylococcus-aureus
#1
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/29325106/transcriptomic-profiling-of-interacting-nasal-staphylococci-species-reveals-global-changes-in-gene-and-non-coding-rna-expression
#2
Grith M M Hermansen, Pavelas Sazinas, Ditte Kofod, Andrew Millard, Paal Skytt Andersen, Lars Jelsbak
Interspecies interactions between bacterial pathogens and the commensal microbiota can influence disease outcome. In the nasal cavities, Staphylococcus epidermidis has been shown to be a determining factor for Staphylococcus aureus colonization and biofilm formation. However, the interaction between S. epidermidis and S. aureus has mainly been described by phenotypic analysis, and little is known about how this interaction modulates gene expression.This study aimed to determine the interactome of nasal S. aureus and S...
January 9, 2018: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29259603/staphylococcal-adhesion-and-host-cell-invasion-fibronectin-binding-and-other-mechanisms
#3
REVIEW
Jérôme Josse, Frédéric Laurent, Alan Diot
Opportunistic bacteria from the genus Staphylococcus can cause life-threatening infections such as pneumonia, endocarditis, bone and joint infections, and sepsis. This pathogenicity is closely related to their capacity to bind directly to the extracellular matrix or to host cells. Adhesion is indeed the first step in the formation of biofilm or the invasion of host cells, which protect the bacteria from the host immune system and facilitate chronic infection. Adhesion relies on the expression of a repertoire of surface proteins called adhesins, notably microbial surface components recognizing adhesive matrix molecules...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29247704/increased-anti-biofilm-efficacy-of-toluidine-blue-on-staphylococcus-species-after-nano-encapsulation
#4
Bishakh Rout, Chi-Hsien Liu, Wei-Chi Wu
BACKGROUND: Photodynamic therapy has been studied by many studies as a method for inactivating bacterial growth. Workers have used planktonic bacterial as well as biofilm bacterial cultures to evaluate the potential of photodynamic therapy in inactivating bacteria. However, almost all the studies use a photosensitiser in aqueous solution, which could be detrimental to the efficiency of photodynamic therapy. METHODS: In this study, the photodynamic killing effect of toluidine blue O (TBO) has been investigated on Staphylococcal biofilms in -vitro...
December 13, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/29229544/a-new-textured-polyphosphazene-biomaterial-with-improved-blood-coagulation-and-microbial-infection-responses
#5
Li-Chong Xu, Zhongjing Li, Zhicheng Tian, Chen Chen, Harry R Allcock, Christopher A Siedlecki
A new poly[bis(octafluoropentoxy) phosphazene] (OFP) was synthesized for the purpose of blood contacting medical devices. OFP was further either developed into crosslinkable polyphosphazene (X-OFP) or blended with polyurethane (PU) as the mixture (OFP/PU) for improvement of mechanical property of polyphosphazene polymers. All the materials were fabricated as smooth films or further textured with submicron pillars for the assay of antimicrobial and antithrombotic properties. Results showed that crosslinkable OFP (X-OFP) and blends of OFP/PU successfully improved the mechanical strength of OFP and fewer defects of pillars were found on the textured polyphosphazene surfaces...
December 8, 2017: Acta Biomaterialia
https://www.readbyqxmd.com/read/29209288/antimicrobial-effects-of-sulfonyl-derivative-of-2-5h-furanone-against-planktonic-and-biofilm-associated-methicillin-resistant-and-susceptible-staphylococcus-aureus
#6
Irshad S Sharafutdinov, Elena Y Trizna, Diana R Baidamshina, Maria N Ryzhikova, Regina R Sibgatullina, Alsu M Khabibrakhmanova, Liliya Z Latypova, Almira R Kurbangalieva, Elvira V Rozhina, Mareike Klinger-Strobel, Rawil F Fakhrullin, Mathias W Pletz, Mikhail I Bogachev, Airat R Kayumov, Oliwia Makarewicz
The gram-positive opportunistic bacterium Staphylococcus aureus is one of the most common causatives of a variety of diseases including skin and skin structure infection or nosocomial catheter-associated infections. The biofilm formation that is an important virulence factor of this microorganism renders the antibiotic therapy ineffective, because biofilm-embedded bacteria exhibit strongly increased tolerance to antimicrobials. Here, we describe a novel 3-chloro-5(S)-[(1R,2S,5R)-2-isopropyl-5-methylcyclohexyloxy]-4-[4-methylphenylsulfonyl]-2(5H)-furanone (F105), possessing a sulfonyl group and l-menthol moiety...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29203484/novel-treatment-of-staphylococcus-aureus-device-related-infections-using-fibrinolytic-agents
#7
S Hogan, J P O'Gara, E O'Neill
Objective: Staphylococcal infections involving biofilms represent a significant challenge in the treatment of patients with device-related infections. Staphylococcus aureus biofilms have been shown to be SaeRS-regulated and dependent on coagulase-catalysed conversion of fibrinogen into fibrin on surfaces coated with human plasma. Here we investigated the treatment of staphylococcal biofilm device-related infections by digesting the fibrin biofilm matrix with and without existing antimicrobials.Methods: The fibrinolytic agents plasmin, streptokinase, nattokinase and the recombinant trypsin-like protease TrypLE™ were used to digest and treat S...
December 4, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29203111/staphylococcal-phospho-lipases-promote-biofilm-formation-and-host-cell-invasion
#8
Minh-Thu Nguyen, Arif Luqman, Katharina Bitschar, Tobias Hertlein, Johannes Dick, Knut Ohlsen, Barbara Bröker, Birgit Schittek, Friedrich Götz
Most Staphylococcus aureus strains secrete two lipases SAL1 and SAL2 encoded by gehA and gehB. These two lipases differ with respect to their substrate specificity. Staphylococcus hyicus secretes another lipase, SHL, which is in contrast to S. aureus lipases Ca2+-dependent and has a broad-spectrum lipase and phospholipase activity. The aim of this study was to investigate the role of staphylococcal (phospho) lipases in virulence. For this we constructed a gehA-gehB double deletion mutant in S. aureus USA300 and expressed SHL in agr-positive (accessory gene regulator) and agr-negative S...
November 29, 2017: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/29169268/contamination-sources-biofilm-forming-ability-and-biocide-resistance-of-staphylococcus-aureus-in-tilapia-processing-facilities
#9
Daniel Vázquez-Sánchez, Juliana A Galvão, Marília Oetterer
The major contamination sources, biofilm-forming ability and biocide resistance of Staphylococcus aureus in tilapia-processing plants were evaluated. Twenty-five processing control points were analysed twice in two factories, including whole tilapias, frozen fillets, water and food-contact surfaces. No final product was contaminated with S. aureus. However, high concentrations of S. aureus carrying enterotoxin ( se) genes were found in several processing points of both factories due to the application of inadequate hygienic and handling procedures, which generate a high risk of cross-contamination of the tilapia fillets with staphylococcal enterotoxins...
January 1, 2017: Food Science and Technology International, Ciencia y Tecnología de Los Alimentos Internacional
https://www.readbyqxmd.com/read/29155125/virulence-characteristics-and-molecular-relatedness-of-methicillin-resistant-staphylococcus-aureus-harboring-different-staphylococcal-cassette-chromosome-mec
#10
Rana El-Baz, Dina E Rizk, Rasha Barwa, Ramadan Hassan
INTRODUCTION: Methicillin resistant Staphylococcus aureus (MRSA) is a versatile pathogen capable of causing multitude of human diseases. It is one of the most important nosocomial pathogen that implicated in community and healthcare associated infections. Therefore, this study aims to characterize different SCCmec elements found in MRSA isolates. Moreover, molecular typing was performed to investigate the genetic relatedness among MRSA isolates. METHODS: Phenotypic identification of MRSA was done by disc diffusion method...
December 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29134109/erratum-author-correction-norgestimate-inhibits-staphylococcal-biofilm-formation-and-resensitizes-methicillin-resistant-staphylococcus-aureus-to-%C3%AE-lactam-antibiotics
#11
Yutaka Yoshii, Ken-Ichi Okuda, Satomi Yamada, Mari Nagakura, Shinya Sugimoto, Tetsuo Nagano, Takayoshi Okabe, Hirotatsu Kojima, Takeo Iwamoto, Kazuyoshi Kuwano, Yoshimitsu Mizunoe
[This corrects the article DOI: 10.1038/s41522-017-0026-1.].
2017: NPJ Biofilms and Microbiomes
https://www.readbyqxmd.com/read/29098937/inhibitory-effects-of-food-additives-derived-from-polyphenols-on-staphylococcal-enterotoxin-a-production-and-biofilm-formation-by-staphylococcus-aureus
#12
Yuko Shimamura, Chikako Hirai, Yuka Sugiyama, Masaharu Shibata, Junya Ozaki, Masatsune Murata, Norio Ohashi, Shuichi Masuda
In this study, we examined the inhibitory effects of 14 food additives derived from polyphenol samples on staphylococcal enterotoxin A (SEA) production and biofilm formation by Staphylococcus aureus. Tannic acid AL (TA), Purephenon 50 W (PP) and Polyphenon 70A (POP) at 0.25 mg/mL and Gravinol®-N (GN), Blackcurrant polyphenol AC10 (BP), and Resveratrol-P5 (RT) at 1.0 mg/mL significantly decreased SEA production by S. aureus C-29 (p < 0.05). TA, GN, BP, and RT significantly inhibited the expression of the sea gene in S...
November 3, 2017: Bioscience, Biotechnology, and Biochemistry
https://www.readbyqxmd.com/read/29092996/the-levels-of-vancomycin-in-the-blood-and-the-wound-after-the-local-treatment-of-bone-and-soft-tissue-infection-with-antibiotic-loaded-calcium-sulphate-as-carrier-material
#13
P Wahl, M Guidi, E Benninger, K Rönn, E Gautier, T Buclin, J-L Magnin, F Livio
AIMS: Calcium sulphate (CaSO4) is a resorbable material that can be used simultaneously as filler of a dead space and as a carrier for the local application of antibiotics. Our aim was to describe the systemic exposure and the wound fluid concentrations of vancomycin in patients treated with vancomycin-loaded CaSO4 as an adjunct to the routine therapy of bone and joint infections. PATIENTS AND METHODS: A total of 680 post-operative blood and 233 wound fluid samples were available for analysis from 94 implantations performed in 87 patients for various infective indications...
November 2017: Bone & Joint Journal
https://www.readbyqxmd.com/read/29075100/biodegradable-rifampicin-releasing-coating-of-surgical-meshes-for-the-prevention-of-bacterial-infections
#14
Jochen Reinbold, Teresa Hierlemann, Lukas Urich, Ann-Kristin Uhde, Ingrid Müller, Tobias Weindl, Ulrich Vogel, Christian Schlensak, Hans Peter Wendel, Stefanie Krajewski
Polypropylene mesh implants are routinely used to repair abdominal wall defects or incisional hernia. However, complications associated with mesh implantation, such as mesh-related infections, can cause serious problems and may require complete surgical removal. Hence, the aim of the present study was the development of a safe and efficient coating to reduce postoperative mesh infections. Biodegradable poly(lactide-co-glycolide acid) microspheres loaded with rifampicin as an antibacterial agent were prepared through single emulsion evaporation method...
2017: Drug Design, Development and Therapy
https://www.readbyqxmd.com/read/29063212/staphylococcal-biofilms-in-atopic-dermatitis
#15
REVIEW
Tammy Gonzalez, Jocelyn M Biagini Myers, Andrew B Herr, Gurjit K Khurana Hershey
PURPOSE OF REVIEW: Atopic dermatitis (AD) is a chronic, relapsing inflammatory skin disorder that is a major public health burden worldwide. AD lesions are often colonized by Staphylococcus aureus and Staphylococcus epidermidis. An important aspect of Staphylococcus spp. is their propensity to form biofilms, adhesive surface-attached colonies that become highly resistant to antibiotics and immune responses, and recent studies have found that clinical isolates colonizing AD skin are often biofilm-positive...
October 23, 2017: Current Allergy and Asthma Reports
https://www.readbyqxmd.com/read/29062489/staphylococcus-aureus-interaction-with-pseudomonas-aeruginosa-biofilm-enhances-tobramycin-resistance
#16
T Beaudoin, Y C W Yau, P J Stapleton, Y Gong, P W Wang, D S Guttman, V Waters
Antimicrobial resistance is a significant threat to the treatment of infectious disease. Multiple mechanisms of resistance to different classes of antibiotics have been identified and well-studied. However, these mechanisms are studied with bacteria in isolation, whereas often, infections have a polymicrobial basis. Using a biofilm slide chamber model, we visualized the formation and development of clinical Pseudomonas aeruginosa biofilms in the presence of secreted Staphylococcus aureus exoproducts, two bacteria that commonly co-infect pediatric patients with cystic fibrosis...
2017: NPJ Biofilms and Microbiomes
https://www.readbyqxmd.com/read/29025325/versatility-of-targeted-antibiotic-loaded-gold-nanoconstructs-for-the-treatment-of-biofilm-associated-bacterial-infections
#17
Daniel G Meeker, Tengjiao Wang, Walter N Harrington, Vladimir P Zharov, Sarah A Johnson, Samir V Jenkins, Stephanie E Oyibo, Christopher M Walker, Weston B Mills, Mark E Shirtliff, Karen E Beenken, Jingyi Chen, Mark S Smeltzer
BACKGROUND: We previously demonstrated that a photoactivatable therapeutic approach employing antibiotic-loaded, antibody-conjugated, polydopamine (PDA)-coated gold nanocages (AuNCs) could be used for the synergistic killing of bacterial cells within a biofilm. The approach was validated with a focus on Staphylococcus aureus using an antibody specific for staphylococcal protein A (Spa) and an antibiotic (daptomycin) active against Gram-positive cocci including methicillin-resistant S...
October 12, 2017: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/28993457/the-electron-transport-chain-sensitises-staphylococcus-aureus-and-enterococcus-faecalis-to-the-oxidative-burst
#18
Kimberley L Painter, Alex Hall, Kam Pou Ha, Andrew M Edwards
Small colony variants (SCVs) of Staphylococcus aureus typically lack a functional electron transport chain and cannot produce virulence factors such as leukocidins, hemolysins or the anti-oxidant staphyloxanthin. Despite this, SCVs are associated with persistent infections of the bloodstream, bones and prosthetic devices. The survival of SCVs in the host has been ascribed to intracellular residency, biofilm formation and resistance to antibiotics. However, the ability of SCVs to resist host defences is largely uncharacterised...
October 9, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28915875/plectranthus-amboinicus-essential-oil-and-carvacrol-bioactive-against-planktonic-and-biofilm-of-oxacillin-and-vancomycin-resistant-staphylococcus-aureus
#19
Sara Edwirgens Costa Benício Vasconcelos, Hider Machado Melo, Theodora Thays Arruda Cavalcante, Francisco Eduardo Aragão Catunda Júnior, Mário Geraldo de Carvalho, Francisca Gleire Rodrigues Menezes, Oscarina Viana de Sousa, Renata Albuquerque Costa
BACKGROUND: The emergence of multidrug-resistant bacteria is a worldwide concern and in order to find an alternative to this problem, the occurrence of antimicrobial compounds in Plectranthus amboinicus essential oil was investigated. Thus, this study aims to determine susceptibility of Staphylococcus aureus isolated from food to antibiotics, P. amboinicus essential oil (PAEO) and carvacrol. METHODS: Leaves and stem of P. amboinicus were used for extraction of essential oil (PAEO) by hydrodistillation technique and EO chemical analysis was performed by gas chromatography coupled to a mass spectrometer...
September 16, 2017: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/28887200/purification-and-characterization-of-a-novel-anti-staphylococcal-peptide-asp-1-from-bacillus-sp-urid-12-1
#20
Ajay Ghosh Chalasani, Utpal Roy, Sushma Nema
A strong anti-methicillin resistant Staphylococcus aureus (MRSA) peptide (ASP-1) from the Bacillus subtilis URID 12.1 strain that is active against cefoxitin- and methicillin-resistant clinical isolates was purified to homogeneity by solvent extraction, silica gel-based adsorption chromatography and reversed phase High Performance Liquid Chromatography. The peptide sequence of ASP-1 as determined by MALDI-TOF/MS and ESI-FTICR MS was acetylated Phe-Thr-Ala-Val-Dhb-Phe-Ile/Leu. The peptide was further analyzed by alkaline hydrolysis, ESI-Q-TOF-MS and an ion mobility assay, which detected the presence of a lactone ring in the intact peptide and a cyclic nature, subsequently revealing the peptide sequence as acPhe-Thr-Val-Ala-Dhb-Phe-Ile/Leu...
September 5, 2017: International Journal of Antimicrobial Agents
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