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https://www.readbyqxmd.com/read/29665678/lectin-functionalized-composite-hydrogels-for-capture-and-killing-of-carbapenem-resistant-pseudomonas-aeruginosa
#1
Nicholas Bodenberger, Dennis Kubiczek, Daniel Halbgebauer, Vittoria Rimola, Sebastian Wiese, Daniel Mayer, Armando Alexei Rodr Iacute Guez Alfonso, Ludger Ständker, Steffen Stenger, Frank Rosenau
Infections with multi-resistant pathogens are a leading cause for mortality worldwide. Just recently, the world health organization (WHO) increased the threat rating for multi-resistant Pseudomonas aeruginosa to the highest possible level. With this background it is crucial to develop novel materials and procedures in the fight against multi-resistant pathogens. In this study we present a novel antimicrobial material, which could find applications as a wound dressing or antimicrobial coating. Lectins are multivalent sugar-binding proteins, which can be found in a variety of plants and bacteria, where they are associated with biofilm formation...
April 17, 2018: Biomacromolecules
https://www.readbyqxmd.com/read/29665443/activity-of-a-nitric-oxide-generating-wound-treatment-system-against-wound-pathogen-biofilms
#2
Richard D Waite, Joanne E Stewart, Abish S Stephen, Robert P Allaker
Wound bioburden plays an important role in impaired healing and the development of infection-related complications. The objective of this study was to determine the efficacy of an innovative two-layer nitric oxide generating system (NOx) to prevent and treat biofilms formed by bacterial and fungal pathogens commonly associated with wound infection, and activity against Pseudomonas aeruginosa virulence factors. Single and mixed species biofilms were grown for 24h on nitrocellulose filters placed on agar. Filters were covered with either NOx or placebo, before and after biofilm formation...
April 14, 2018: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/29664610/bioprinting-living-biofilms-through-optogenetic-manipulation
#3
Yajia Huang, Aiguo Xia, Guang Yang, Fan Jin
In this paper, we present a new strategy for microprinting dense bacterial communities with a prescribed organization on a substrate. Unlike conventional bioprinting techniques that require bioinks, through optogenetic manipulation, we directly manipulated the behaviors of Pseudomonas aeruginosa to allow these living bacteria to autonomically form patterned biofilms following prescribed illumination. The results showed that through optogenetic manipulation, patterned bacterial communities with high spatial resolution (approximately 10 μm) could be constructed in 6 h...
April 18, 2018: ACS Synthetic Biology
https://www.readbyqxmd.com/read/29663827/potential-of-antimicrobial-treatment-of-linear-low-density-polyethylene-with-poly-tert-butyl-amino-methyl-styrene-to-reduce-biofilm-formation-in-the-food-industry
#4
Carina Hüwe, Jennifer Schmeichel, Florian Brodkorb, Sophia Dohlen, Katrin Kalbfleisch, Martin Kreyenschmidt, Reinhard Lorenz, Judith Kreyenschmidt
Antimicrobial surfaces are one approach to prevent biofilms in the food industry. The aim of this study was to investigate the effect of poly((tert-butyl-amino)-methyl-styrene) (poly(TBAMS)) incorporated into linear low-density polyethylene (LLDPE) on the formation of mono- and mixed-species biofilms. The biofilm on untreated and treated LLDPE was determined after 48 and 168 h. The comparison of the results indicated that the ability of Listeria monocytogenes to form biofilms was completely suppressed by poly(TBAMS) (Δ168 h 3...
April 17, 2018: Biofouling
https://www.readbyqxmd.com/read/29662232/characterization-of-aiik-an-ahl-lactonase-from-kurthia-huakui-lam0618-t-and-its-application-in-quorum-quenching-on-pseudomonas-aeruginosa-pao1
#5
Weiwei Dong, Jie Zhu, Xiang Guo, Delong Kong, Qi Zhang, Yiqing Zhou, Xiaoyang Liu, Shumiao Zhao, Zhiyong Ruan
N-Acyl homoserine lactones (AHLs) act as the key quorum sensing (QS) signal molecules in gram-negative bacteria, which coordinates gene expression and then activates various processes, including biofilm formation and production of virulence factors in some pathogens. Quorum quenching (QQ), which is the inactivation of the signal molecules by means of enzymatic degradation or modification, inhibits the processes of QS rather than killing the pathogens and is a promising antipathogenic strategy to control the bacterial pathogens...
April 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29661876/antimicrobial-and-antibiofilm-efficacy-of-graphene-oxide-against-chronic-wound-microorganisms
#6
Mara Di Giulio, Romina Zappacosta, Silvia Di Lodovico, Emanuela Di Campli, Gabriella Siani, Antonella Fontana, Luigina Cellini
Chronic wounds represent an increasing problem worldwide. Graphene oxide (GO) has been reported to exhibit strong antibacterial activity towards both Gram-positive and Gram-negative bacteria. The aim of this work was to investigate the in vitro antimicrobial and antibiofilm efficacy of GO against wound pathogens. Staphylococcus aureus PECHA 10, Pseudomonas aeruginosa PECHA 4 and Candida albicans X3 clinical isolates were incubated with 50 mg/L of GO for 2 and 24 h to evaluate the antimicrobial effect. Optical and Atomic force microscopy images were performed to visualize the GO effect on microbial cells...
April 16, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29661867/triclosan-is-an-aminoglycoside-adjuvant-for-the-eradication-of-pseudomonas-aeruginosa-biofilms
#7
Michael M Maiden, Alessandra M Agostinho Hunt, Mitchell P Zachos, Jacob A Gibson, Martin E Hurwitz, Martha H Mulks, Christopher M Waters
One of the most important clinical obstacles in cystic fibrosis (CF) is antibiotic treatment failure due to biofilms produced by Pseudomonas aeruginosa The ability of this pathogen to survive eradication by tobramycin and pathoadapt into a hyper-biofilm state leading to chronic infections is key to its success. Retrospective studies have demonstrated that preventing this pathoadaptation by improving eradication is essential to extend the lives of CF patients. To identify adjuvants that enhance tobramycin eradication of P...
April 16, 2018: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/29657574/the-impairment-of-methyl-metabolism-from-luxs-mutation-of-streptococcus-mutans
#8
Xuchen Hu, Yuxia Wang, Li Gao, Wenxin Jiang, Wenzhen Lin, Chenguang Niu, Keyong Yuan, Rui Ma, Zhengwei Huang
The luxS gene is present in a wide range of bacteria and is involved in many cellular processes. LuxS mutation can cause autoinducer(AI)-2 deficiency and methyl metabolism disorder. The objective of this study was to demonstrate that, in addition to AI-2-mediated quorum sensing (QS), methyl metabolism plays an important role in LuxS regulation in Streptococcus mutans . The sahH gene from Pseudomonas aeruginosa was amplified and introduced into the S. mutans luxS -null strain to complement the methyl metabolism disruption in a defective QS phenotype...
2018: Frontiers in Microbiology
https://www.readbyqxmd.com/read/29653115/facile-one-pot-multicomponent-synthesis-and-molecular-docking-studies-of-steroidal-oxazole-thiazole-derivatives-with-effective-antimicrobial-antibiofilm-and-hemolytic-properties
#9
Anam Ansari, Abad Ali, Mohd Asif, Mohd Ahmar Rauf, Mohammad Owais, Shamsuzzaman
A series of steroidal oxazole and thiazole derivatives have been synthesized employing thiosemicarbazide/semicarbazide hydrochloride and ethyl 2-chloroacetoacetate with a simple and facile one-pot multicomponent reaction pathway. The antimicrobial activity of newly synthesized compounds were evaluated against four bacterial strains namely Gram-negative (Escherechia coli and Pseudomonas aeruginosa) and Gram-positive bacteria (Staphylococcus aureus and Listeria monocytogenes) in addition to pathogenic fungi (Candida albicans and Cryptococcus neoformans)...
April 10, 2018: Steroids
https://www.readbyqxmd.com/read/29648588/influence-of-three-dimensional-lung-epithelial-cells-and-interspecies-interactions-on-antibiotic-efficacy-against-mycobacterium-abscessus-and-pseudomonas-aeruginosa
#10
Graciela Rodríguez-Sevilla, Charlotte Rigauts, Eva Vandeplassche, Lisa Ostyn, Ignacio Mahíllo-Fernández, Jaime Esteban, Concepción Pérez-Jorge Peremarch, Tom Coenye, Aurélie Crabbé
Mycobacterium abscessus lung infection is a major health problem for cystic fibrosis (CF) patients. Understanding the in vivo factors that influence the outcome of therapy may help addressing the poor correlation between in vitro and in vivo antibiotic efficacy. We evaluated the influence of interspecies interactions and lung epithelial cells on antibiotic efficacy. Therefore, single and dual species biofilms of M. abscessus and a major CF pathogen (Pseudomonas aeruginosa) were cultured on a plastic surface or on in vivo-like three-dimensional (3-D) lung epithelial cells, and the activity of antibiotics (colistin, amikacin, clarithromycin, ceftazidime) in inhibiting biofilm formation was evaluated...
April 10, 2018: Pathogens and Disease
https://www.readbyqxmd.com/read/29643807/antimicrobial-peptides-and-their-therapeutic-potential-for-bacterial-skin-infections-and-wounds
#11
REVIEW
Anja Pfalzgraff, Klaus Brandenburg, Günther Weindl
Alarming data about increasing resistance to conventional antibiotics are reported, while at the same time the development of new antibiotics is stagnating. Skin and soft tissue infections (SSTIs) are mainly caused by the so called ESKAPE pathogens ( Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa , and Enterobacter species) which belong to the most recalcitrant bacteria and are resistant to almost all common antibiotics. S. aureus and P. aeruginosa are the most frequent pathogens isolated from chronic wounds and increasing resistance to topical antibiotics has become a major issue...
2018: Frontiers in Pharmacology
https://www.readbyqxmd.com/read/29630036/paraffin-embedding-and-thin-sectioning-of-microbial-colony-biofilms-for-microscopic-analysis
#12
William C Cornell, Chase J Morgan, Leslie Koyama, Hassan Sakhtah, Jennifer H Mansfield, Lars E P Dietrich
Sectioning via paraffin embedding is a broadly established technique in eukaryotic systems. Here we provide a method for the fixation, embedding, and sectioning of intact microbial colony biofilms using perfused paraffin wax. To adapt this method for use on colony biofilms, we developed techniques for maintaining each sample on its growth substrate and laminating it with an agar overlayer, and added lysine to the fixative solution. These optimizations improve sample retention and preservation of micromorphological features...
March 23, 2018: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/29629858/pseudomonas-aeruginosa-puma-acts-on-an-endogenous-phenazine-to-promote-self-resistance
#13
Abigail J Sporer, Christopher Beierschmitt, Anastasia Bendebury, Katherine E Zink, Alexa Price-Whelan, Marisa C Buzzeo, Laura M Sanchez, Lars E P Dietrich
The activities of critical metabolic and regulatory proteins can be altered by exposure to natural or synthetic redox-cycling compounds. Many bacteria, therefore, possess mechanisms to transport or transform these small molecules. The opportunistic pathogen Pseudomonas aeruginosa PA14 synthesizes phenazines, redox-active antibiotics that are toxic to other organisms but have beneficial effects for their producer. Phenazines activate the redox-sensing transcription factor SoxR and thereby induce the transcription of a small regulon, including the operon mexGHI-opmD, which encodes an efflux pump that transports phenazines, and PA14_35160 (pumA), which encodes a putative monooxygenase...
April 9, 2018: Microbiology
https://www.readbyqxmd.com/read/29623707/quantitative-sims-imaging-of-agar-based-microbial-communities
#14
Sage J B Dunham, Joseph F Ellis, Nameera F Baig, Nydia Morales-Soto, Tianyuan Cao, Joshua D Shrout, Paul W Bohn, Jonathan V Sweedler
After several decades of widespread use for mapping elemental ions and small molecular fragments in surface science, secondary ion mass spectrometry (SIMS) has emerged as a powerful analytical tool for molecular imaging in biology. SIMS has primarily been used as a qualitative technique; although the distribution of a single analyte can be accurately determined, it is difficult to map the absolute quantity of a compound, or even to compare the relative abundance of one molecular species to that of another. We describe a method for quantitative SIMS imaging of small molecules in agar-based microbial communities...
April 6, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/29618401/a-novel-genetic-determination-of-a-lectin-gene-in-iraqi-acinetobacter-baumannii-isolates-and-use-of-purified-lectin-as-an-antibiofilm-agent
#15
Sahira Nsayef Muslim, Israa M S Al-Kadmy, Ibtesam Ghadban Auda, Alaa Naseer Mohammed Ali, Sawsan Sajid Al-Jubori
Background : Lectin was initially called hemagglutinin or agglutinin because of its capacity to agglutinate human as well as human erythrocytes. They are a heterogeneous group of proteins or glycoproteins of nonimmune origin. Because of their chemical properties, they have become a useful tool in several fields such as immunology, cell biology, molecular biology, membrane structure, pharmacology, cancer research, clinical chemistry, and genetic engineering. Objective : The wide applications of lectins users urged the need to isolate lectins from a new strain of bacteria can produce new and high yield of lectin because the current production of lectin from Pseudomonas spp...
April 4, 2018: Journal of AOAC International
https://www.readbyqxmd.com/read/29617986/fermentation-products-in-the-cystic-fibrosis-airways-induce-aggregation-and-dormancy-associated-expression-profiles-in-a-cf-clinical-isolate-of-pseudomonas-aeruginosa
#16
Joann Phan, Tara Gallagher, Andrew Oliver, Whitney England, Katrine Whiteson
Pseudomonas aeruginosa is a well-known dominant opportunistic pathogen in cystic fibrosis (CF) with a wide range of metabolic capacities. However, P. aeruginosa does not colonize the airways alone, and benefits from the metabolic products of neighboring cells-especially volatile molecules that can travel between different parts of the airways easily. Here, we present a study that investigates the metabolic, gene expression profiles, and phenotypic responses of a P. aeruginosa clinical isolate to fermentation products lactic acid and 2,3-butanediol, metabolites that are produced by facultative anaerobic members of the CF polymicrobial community and potential biomarkers of disease progression...
March 29, 2018: FEMS Microbiology Letters
https://www.readbyqxmd.com/read/29617698/pseudomonas-aeruginosa-and-klebsiella-pneumoniae-adaptation-to-innate-immune-clearance-mechanisms-in-the-lung
#17
Sebastian A Riquelme, Danielle Ahn, Alice Prince
Many different species of gram-negative bacteria are associated with infection in the lung, causing exacerbations of chronic obstructive pulmonary disease, cystic fibrosis (CF), and ventilator-associated pneumonias. These airway pathogens must adapt to common host clearance mechanisms that include killing by antimicrobial peptides, antibiotics, oxidative stress, and phagocytosis by leukocytes. Bacterial adaptation to the host is often evident phenotypically, with increased extracellular polysaccharide production characteristic of some biofilm-associated organisms...
April 4, 2018: Journal of Innate Immunity
https://www.readbyqxmd.com/read/29616824/thermostable-xylanase-inhibits-and-disassembles-pseudomonas-aeruginosa-biofilms
#18
Jin-Hyung Lee, Yong-Guy Kim, Jintae Lee
Pseudomonas aeruginosa biofilms are problematic and play a critical role in the persistence of chronic infections because of their ability to tolerate antimicrobial agents. In this study, various cell-wall degrading enzymes were investigated for their ability to inhibit biofilm formation of two P. aeruginosa strains, PAO1 and PA14. Xylanase markedly inhibited and detached P. aeruginosa biofilms without affecting planktonic growth. Xylanase treatment broke down extracellular polymeric substances and decreased the viscosity of P...
April 4, 2018: Biofouling
https://www.readbyqxmd.com/read/29616198/regulation-of-nicotine-tolerance-by-quorum-sensing-and-high-efficiency-of-quorum-quenching-under-nicotine-stress-in-pseudomonas-aeruginosa-pao1
#19
Huiming Tang, Yunyun Zhang, Yifan Ma, Mengmeng Tang, Dongsheng Shen, Meizhen Wang
Quorum sensing (QS) regulates the behavior of bacterial populations and promotes their adaptation and survival under stress. As QS is responsible for the virulence of vast majority of bacteria, quorum quenching (QQ), the interruption of QS, has become an attractive therapeutic strategy. However, the role of QS in stress tolerance and the efficiency of QQ under stress in bacteria are seldom explored. In this study, we demonstrated that QS-regulated catalase (CAT) expression and biofilm formation help Pseudomonas aeruginosa PAO1 resist nicotine stress...
2018: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29615997/the-skin-microbiome-of-the-neotropical-frog-craugastor-fitzingeri-inferring-potential-bacterial-host-pathogen-interactions-from-metagenomic-data
#20
Eria A Rebollar, Ana Gutiérrez-Preciado, Cecilia Noecker, Alexander Eng, Myra C Hughey, Daniel Medina, Jenifer B Walke, Elhanan Borenstein, Roderick V Jensen, Lisa K Belden, Reid N Harris
Skin symbiotic bacteria on amphibians can play a role in protecting their host against pathogens. Chytridiomycosis, the disease caused by Batrachochytrium dendrobatidis , Bd, has caused dramatic population declines and extinctions of amphibians worldwide. Anti-Bd bacteria from amphibian skin have been cultured, and skin bacterial communities have been described through 16S rRNA gene amplicon sequencing. Here, we present a shotgun metagenomic analysis of skin bacterial communities from a Neotropical frog, Craugastor fitzingeri ...
2018: Frontiers in Microbiology
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