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https://www.readbyqxmd.com/read/29152103/myxinidin2-and-myxinidin3-suppress-inflammatory-responses-through-stat3-and-mapks-to-promote-wound-healing
#1
Hyo Mi Han, Sujin Ko, Min-Ju Cheong, Jeong Kyu Bang, Chang Ho Seo, Tudor Luchian, Yoonkyung Park
Skin wounds are continuously exposed to bacteria and can easily become infected. Infected wounds require antibiotic treatment, and infections caused by drug-resistant bacteria are an important public health problem. Antimicrobial peptides have broad-spectrum antibacterial activity, induce little or no drug resistance and may be suitable for treating skin infections caused by drug-resistant bacteria. We previously reported the design and function of myxinidin and myxinidin analogues. Here we showed that myxinidin2 and myxinidin3 exhibit antimicrobial and anti-biofilm activities against antibiotic-resistant Staphylococcus aureus, Acinetobacter baumannii, and Pseudomonas aeruginosa in high salt environments and in gelatin...
October 20, 2017: Oncotarget
https://www.readbyqxmd.com/read/29151063/predation-among-microorganisms-a-huge-potential-of-interspecies-dependencies
#2
Justyna Kowalska, Marcin Włodarczyk
There are many interactions between species (including bacteria) in the environment. One of them is predation, which always leads to the death of a prey. Described in this review Bdellovibrio bacteriovorus (Deltaproteobacteria) and Micavibrio aeruginosavorus (Alfaproteobacteria) are uniflagellate, rod shaped and curved obligate predators of Gram-negative bacteria. Both species belong to the group of BALOs (Bdellovibrio and like organisms). B. bacteriovorus use periplasmic predatory strategy and M. aeruginosavorus are epibiotic hunters...
November 3, 2017: Postȩpy Higieny i Medycyny Doświadczalnej
https://www.readbyqxmd.com/read/29136598/bacterial-population-and-chemicals-in-bioaerosols-from-indoor-environment-sludge-dewatering-houses-in-nine-municipal-wastewater-treatment-plants
#3
Yunping Han, Yanjie Wang, Lin Li, Guangsu Xu, Junxin Liu, Kaixiong Yang
Municipal wastewater treatment plants (MWTPs) are regarded as sources of airborne microorganisms. Sludge dewatering house (SDH) is one of the most serious indoor bioaerosol pollution treatment sectors in MWTPs. In this study, properties of bioaerosols from SDHs of nine MWTPs were investigated in China. Results suggested that bioaerosols were generated mainly from the mixed liquor and will be promoted by the mechanical motion of belts of dewatering devices. They will accumulate in the SDHs due to the treatment devices placed inside...
November 11, 2017: Science of the Total Environment
https://www.readbyqxmd.com/read/29136420/assessment-of-environmental-contamination-with-pathogenic-bacteria-at-a-hospital-laundry-facility
#4
Karen E Michael, David No, William E Daniell, Noah S Seixas, Marilyn C Roberts
Little is known about exposure to pathogenic bacteria among industrial laundry workers who work with soiled clinical linen. To study worker exposures, an assessment of surface contamination was performed at an industrial laundry facility serving hospitals in Seattle, WA, USA. Surface swab samples (n = 240) from the environment were collected during four site visits at 3-month intervals. These samples were cultured for Clostridium difficile, methicillin-resistant Staphylococcus aureus (MRSA), and vancomycin-resistant enterococci (VRE)...
November 10, 2017: Annals of Work Exposures and Health
https://www.readbyqxmd.com/read/29123505/staphylococcus-aureus-in-some-brazilian-dairy-industries-changes-of-contamination-and-diversity
#5
Karen K Dittmann, Luíza T Chaul, Sarah H I Lee, Carlos H Corassin, Carlos A Fernandes de Oliveira, Elaine C Pereira De Martinis, Virgínia F Alves, Lone Gram, Virginie Oxaran
Staphylococcus aureus, a major food-poisoning pathogen, is a common contaminant in dairy industries worldwide, including in Brazil. We determined the occurrence of S. aureus in five dairies in Brazil over 8 months. Of 421 samples, 31 (7.4%) were positive for S. aureus and prevalence varied from 0 to 63.3% between dairies. Sixty-six isolates from the 31 samples were typed by Multi-Locus Sequence Typing to determine if these isolates were persistent or continuously reintroduced. Seven known sequence types (STs), ST1, ST5, ST30, ST97, ST126, ST188 and ST398, and four new ST were identified, ST3531, ST3540, ST3562 and ST3534...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29120018/rna-metabolism-in-staphylococcus-aureus-virulence
#6
Patrick Linder, Joshua Armitano
The opportunistic pathogen Staphylococcus aureus encounters a variety of host defence systems depending on its localisation during colonisation in the nares, systemic infections within the body, or persistent infections within cells or embedded in biofilms. To respond rapidly to these different environments, this bacterium has evolved, in its longstanding interaction with animal and human hosts, a variety of mechanisms to fine-tune its gene expression. RNA metabolism, including transcription, processing, translation into proteins and RNA decay, is a central player in this response and might in the future be used to treat this feared pathogen...
November 9, 2017: Swiss Medical Weekly
https://www.readbyqxmd.com/read/29113502/osteogenic-and-antibacterial-properties-of-vancomycin-laden-mesoporous-bioglass-plga-composite-scaffolds-for-bone-regeneration-in-infected-bone-defects
#7
Tao Cheng, Haiyun Qu, Guoyou Zhang, Xianlong Zhang
Chronic osteomyelitis and infected bone defects are substantial challenges faced by orthopaedic surgeons. In this study, vancomycin was loaded into mesoporous bioactive glass (MBG) to form a local antibiotic delivery system and then a bone tissue-engineering scaffold combining MBG and poly-(L-lactic-co-glycolic acid) (PLGA) was prepared by freeze-drying fabrication. In vitro degradation and water contact angle analysis suggested that the MBG-incorporated PLGA scaffold exhibited controlled degradability, stabilizing the pH of the surrounding environment and improved the hydrophilicity...
November 7, 2017: Artificial Cells, Nanomedicine, and Biotechnology
https://www.readbyqxmd.com/read/29100465/capsaicin-inspired-thiol-ene-terpolymer-networks-designed-for-antibiofouling-coatings
#8
Haiye Wang, Joshua Jasensky, Nathan Ulrich, Junjie Chen, Hao Huang, Zhan Chen, Chunju He
Novel photocurable ternary polymer networks were prepared by incorporating N-(4-hydroxy-3-methoxybenzyl)-acrylamide (HMBA) into a cross-linked thiol-ene network based on poly(ethylene glycol) diacrylate (PEGDA) and (mercaptopropyl) methylsiloxane homopolymers (MSHP). The ternary network materials displayed bactericidal activity against Escherichia coli, Staphylococcus aureus, and reduced the attachment of marine organism Phaeodactylum tricornutum. Extensive soaking of the polymer networks in aqueous solution indicated that no active antibacterial component leached out from the materials, and thus the ternary thiol-ene coating killed the bacteria by surface contact...
November 3, 2017: Langmuir: the ACS Journal of Surfaces and Colloids
https://www.readbyqxmd.com/read/29099921/methicillin-resistant-staphylococcus-aureus-in-minas-frescal-cheese-evaluation-of-classic-enterotoxin-genes-antimicrobial-resistance-and-clonal-diversity
#9
Alice Gonçalves Martins Gonzalez, Leila Márcia Peres Marques, Marcel da Silva Amorim Gomes, JhonathanCampos do Couto Beltrão, Marcos Gabriel Pinheiro, Luciana Maria Ramires Esper, Geraldo Renato de Paula, Lenise Arneiro Teixeira, Fábio Aguiar-Alves
This study aimed to investigate classical enterotoxin (sea to see) and mecA genes, by polymerase chain reaction (PCR) and anitimicrobial susceptibility, by disc diffusion test of Staphylococcus aureus isolated from minas frescal cheese (MFC). All methicillin resistant S. aureus (MRSA) isolates were investigated for the presence of PVL genes and clonal diversity. Thirty-one S. aureus were isolated from four MFC samples. Seven (22.6%) S. aureus carried mecA gene and two of them carried enterotoxin genes seb/sec and sea/seb...
November 1, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29097104/characterization-of-microbial-community-composition-antimicrobial-resistance-and-biofilm-on-intensive-care-surfaces
#10
K Johani, D Abualsaud, D M Costa, H Hu, G Whiteley, A Deva, K Vickery
BACKGROUND: Organisms causing healthcare associated infections can be sourced from the inanimate environment around patients. Residing in a biofilm increases the chances of these organisms persisting in the environment. We aimed to characterise bacterial environmental contamination, genetically and physiologically, and relate this to general intensive care unit (ICU) cleanliness. METHODS: Cleanliness was determined by adenosine triphosphate (ATP) measurements of 95 high-touch objects...
October 30, 2017: Journal of Infection and Public Health
https://www.readbyqxmd.com/read/29096062/disassembly-of-bacterial-biofilms-by-the-self-assembled-glycolipids-derived-from-renewable-resources
#11
Yadavali Siva Prasad, Sandeep Miryala, Krishnamoorthy Lalitha, K Ranjitha, Shehnaz Barbhaiwala, Vellaisamy Sridharan, C Uma Maheswari, C S Srinandan, Subbiah Nagarajan
More than 80% of chronic infections of bacteria are caused by biofilms. It is also a long-term survival strategy of the pathogens in a nonhost environment. Several amphiphilic molecules have been used in the past to potentially disrupt biofilms; however, the involvement of multistep synthesis, complicated purification and poor yield still remains a major problem. Herein, we report a facile synthesis of glycolipid based surfactant from renewable feedstocks in good yield. The nature of carbohydrate unit present in glycolipid influence the ring chain tautomerism, which resulted in the existence of either cyclic structure or both cyclic and acyclic structures...
November 10, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29089427/the-metallophore-staphylopine-enables-staphylococcus-aureus-to-compete-with-the-host-for-zinc-and-overcome-nutritional-immunity
#12
Kyle P Grim, Brian San Francisco, Jana N Radin, Erin B Brazel, Jessica L Kelliher, Paola K Párraga Solórzano, Philip C Kim, Christopher A McDevitt, Thomas E Kehl-Fie
During infection, the host sequesters essential nutrients, such as zinc, to combat invading microbes. Despite the ability of the immune effector protein calprotectin to bind zinc with subpicomolar affinity, Staphylococcus aureus is able to successfully compete with the host for zinc. However, the zinc importers expressed by S. aureus remain unknown. Our investigations have revealed that S. aureus possesses two importers, AdcABC and CntABCDF, which are induced in response to zinc limitation. While AdcABC is similar to known zinc importers in other bacteria, CntABCDF has not previously been associated with zinc acquisition...
October 31, 2017: MBio
https://www.readbyqxmd.com/read/29083115/an-update-on-environmental-mastitis-challenging-perceptions
#13
I C Klaas, R N Zadoks
Environmental mastitis is the most common and costly form of mastitis in modern dairy herds where contagious transmission of intramammary pathogens is controlled through implementation of standard mastitis prevention programmes. Environmental mastitis can be caused by a wide range of bacterial species, and binary classification of species as contagious or environmental is misleading, particularly for Staphylococcus aureus, Streptococcus uberis and other streptococcal species, including Streptococcus agalactiae...
October 30, 2017: Transboundary and Emerging Diseases
https://www.readbyqxmd.com/read/29082233/macrophages-as-drivers-of-an-opportunistic-infection
#14
COMMENT
Annette C Vergunst, Nazareth Lopez Carranza, Lili Zhang, Margarida C Gomes, Yara Tasrini, Annemarie H Meijer, David O'Callaghan
Opportunistic pathogens are a worldwide cause of mortality and morbidity, and infections with intrinsically antibiotic-resistant pathogens have a large clinical, social and economic impact. Bacteria belonging to the Burkholderia cepacia complex (Bcc), ubiquitous in natural and industrial environments, are notorious pathogens for individuals with cystic fibrosis (CF). In addition, Burkholderia cenocepacia is emerging as the culprit of non-CF related, sometimes fatal infections. Knowledge of the underlying infection mechanism of these pathogens is important for efficient treatment, however, to date not much is known about the lifestyle of Bcc bacteria during infection...
September 13, 2017: Microbial Cell
https://www.readbyqxmd.com/read/29080625/diversity-of-livestock-associated-methicillin-resistant-staphylococcus-aureus
#15
Henok A Tegegne, Ivana Koláčková, Renata Karpíšková
OBJECTIVE: To evaluate the diversity and molecular characteristics of livestock associated methicillin-resistant Staphylococcus aureus in livestock animals, food of animal origin and the environment in the Czech Republic. METHODS: After having been primarily enriched in buffered peptone water, the samples were cultured on Baird-Parker agar. Presumptive colonies were sub-cultured to blood agar and assessed morphologically. Furthermore, presumptive Staphylococcus aureus colonies were confirmed by MALDI-TOF...
September 2017: Asian Pacific Journal of Tropical Medicine
https://www.readbyqxmd.com/read/29079617/staphylococcus-edaphicus-sp-nov-isolated-in-antarctica-harbours-mecc-gene-and-genomic-islands-with-suspected-role-in-adaptation-to-extreme-environment
#16
Roman Pantůček, Ivo Sedláček, Adéla Indráková, Veronika Vrbovská, Ivana Mašlaňová, Vojtěch Kovařovic, Pavel Švec, Stanislava Králová, Lucie Krištofová, Jana Kekláková, Petr Petráš, Jiří Doškař
Two Gram-stain-positive, coagulase-negative staphylococcal strains were isolated from abiotic sources, stone fragments and sandy soil in James Ross Island, Antarctica. Here we describe properties of novel species of the genus Staphylococcus that has near identical 16S rRNA gene sequence to Staphylococcus saprophyticus However, compared to S. saprophyticus and the next closest relatives, the new species demonstrates considerable phylogenetic distance at whole genome level, average nucleotide identity <85 %, and inferred DNA-DNA hybridization <30%...
October 27, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/29078799/comparing-microbiotas-in-the-upper-aerodigestive-and-lower-respiratory-tracts-of-lambs
#17
Laura Glendinning, David Collie, Steven Wright, Kenny M D Rutherford, Gerry McLachlan
BACKGROUND: Recently, the importance of the lung microbiota during health and disease has been examined in humans and in small animal models. Whilst sheep have been proposed as an appropriate large animal model for studying the pathophysiology of a number of important human respiratory diseases, it is clearly important to continually define the limits of agreement between these systems as new concepts emerge. In humans, it has recently been established that the lung microbiota is seeded by microbes from the oral cavity...
October 27, 2017: Microbiome
https://www.readbyqxmd.com/read/29069388/the-secreted-polyketide-boydone-a-is-responsible-for-the-anti-staphylococcus-aureus-activity-of-scedosporium-boydii
#18
Cindy Staerck, Anne Landreau, Gaëtan Herbette, Catherine Roullier, Samuel Bertrand, Benjamin Siegler, Gérald Larcher, Jean-Philippe Bouchara, Maxime J J Fleury
Usually living as a soil saprophyte, the filamentous fungus Scedosporium boydii may also cause various infections in human. Particularly, it is one of the major causative agents of fungal colonization of the airways in patients with cystic fibrosis (CF). To compete with other microorganisms in the environment, fungi have evolved sophisticated strategies, including the production of secondary metabolites with antimicrobial activity which may also help them to establish successfully within the respiratory tract of receptive hosts...
October 24, 2017: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29066141/evaluation-of-a-shoe-sole-uvc-device-to-reduce-pathogen-colonization-on-floors-surfaces-and-patients
#19
Tasnuva Rashid, Kelley Poblete, Jonathan Amadio, Irtiza Hasan, Khurshida Begum, M Jahangir Alam, Kevin W Garey
BACKGROUND: Recently, a UVC decontamination device has become available that delivers germicidal UVC radiation to shoe soles. The objective of this study were to demonstrate that shoe soles can be vectors for healthcare associated infection and whether a UVC shoe sole decontamination device would be effective at decreasing this risk. METHODOLOGY: Three bacterial strains (Staphylococcus aureus, Enterococcus faecalis, and Escherichia coli, and a non-toxigenic strain of Clostridium difficile were spiked onto standardized rubber soled shoe soles and then randomly selected to UVC exposure or no UVC exposure...
October 21, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/29063334/effects-of-multicide-antibacterial-drug-on-staphylococcus-biomembranes
#20
G V Tetz, N K Artemenko, G M Yankovskii, L V Kever, Ya Yu Komissarchik, V V Tetz
Drug penetration into bacterial biomembranes is one of the most important factors determining the efficiency of antibacterial therapy. Multicide, antibacterial drug, is a nanomolecule 1.3-2.0 nm in size, easily penetrating into staphylococcus biomembranes and causing rapid death of bacteria. The drug efficiency depends on its concentration and duration of exposure. Bacteria die as a result of cell wall perforation, which is associated with changes in its morphology and release of DNA from bacterial cell into the environment...
October 2017: Bulletin of Experimental Biology and Medicine
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