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https://www.readbyqxmd.com/read/27934096/microfluidic-air-sampler-for-highly-efficient-bacterial-aerosol-collection-and-identification
#1
Xiaojun Bian, Ying Lan, Bing Wang, Yu Shrike Zhang, Baohong Liu, Pengyuan Yang, Weijia Zhang, Liang Qiao
The early warning capability of the presence of biological aerosol threats is an urgent demand in ensuing civilian and military safety. Efficient and rapid air sample collection in relevant indoor or outdoor environment is a key step for subsequent analysis of airborne microorganisms. Herein, we report a portable battery-powered sampler that is capable of highly efficient bioaerosol collection. The essential module of the sampler is a polydimethylsiloxane (PDMS) microfluidic chip, which consisted of a 3-loop double-spiral microchannel featuring embedded herringbone and sawtooth wave-shaped structures...
December 6, 2016: Analytical Chemistry
https://www.readbyqxmd.com/read/27933593/inflammation-induced-cd69-kupffer-cell-feedback-inhibits-t-cell-proliferation-via-membrane-bound-tgf-%C3%AE-1
#2
Xiang Zhang, Zhengping Jiang, Yan Gu, Yanfang Liu, Xuetao Cao, Yanmei Han
Kupffer cells, tissue-resident macrophage lineage cell, are enriched in vertebrate liver. The mouse F4/80(+) Kupffer cells have been subclassified into two subpopulations according to their phenotype and function: CD68(+) subpopulation with potent reactive oxygen species (ROS) production and phagocytic capacities, and CD11b(+) subpopulation with a potent capacity to produce T helper 1 cytokines. In addition, CD11b(+) Kupffer cells/macrophages may be migrated from the bone marrow or spleen, especially in inflammatory conditions of the liver...
December 6, 2016: Science China. Life Sciences
https://www.readbyqxmd.com/read/27933042/the-role-of-stress-and-stress-adaptations-in-determining-the-fate-of-the-bacterial-pathogen-listeria-monocytogenes-in-the-food-chain
#3
REVIEW
Kerrie NicAogáin, Conor P O'Byrne
The foodborne pathogen Listeria monocytogenes is a highly adaptable organism that can persist in a wide range of environmental and food-related niches. The consumption of contaminated ready-to-eat foods can cause infections, termed listeriosis, in vulnerable humans, particularly those with weakened immune systems. Although these infections are comparatively rare they are associated with high mortality rates and therefore this pathogen has a significant impact on food safety. L. monocytogenes can adapt to and survive a wide range of stress conditions including low pH, low water activity, and low temperature, which makes it problematic for food producers who rely on these stresses for preservation...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27932656/draft-genome-sequences-of-two-historical-listeria-monocytogenes-strains-from-human-listeriosis-cases-in-1933
#4
Vikrant Dutta, Sangmi Lee, Todd J Ward, Nathane Orwig, Eric Altermann, Dereje Jima, Cameron Parsons, Sophia Kathariou
We report here the draft genome sequences of two Listeria monocytogenes strains from some of the earliest reported cases of human listeriosis in North America. The strains were isolated in 1933 from patients in Massachusetts and Connecticut, USA, and belong to the widely disseminated hypervirulent clonal complex 1 (CC1) and CC2.
December 8, 2016: Genome Announcements
https://www.readbyqxmd.com/read/27930711/licheniocin-50-2-and-bacteriocins-from-lactococcus-lactis-subsp-lactis-biovar-diacetylactis-bgbu1-4-inhibit-biofilms-of-coagulase-negative-staphylococci-and-listeria-monocytogenes-clinical-isolates
#5
Ivana Cirkovic, Dragana D Bozic, Veselin Draganic, Jelena Lozo, Tanja Beric, Milan Kojic, Biljana Arsic, Eliana Garalejic, Slobodanka Djukic, Slavisa Stankovic
BACKGROUND: Coagulase negative staphylococci (CoNS) and Listeria monocytogenes have important roles in pathogenesis of various genital tract infections and fatal foetomaternal infections, respectively. The aim of our study was to investigate the inhibitory effects of two novel bacteriocins on biofilms of CoNS and L. monocytogenes genital isolates. METHODS: The effects of licheniocin 50.2 from Bacillus licheniformis VPS50.2 and crude extract of bacteriocins produced by Lactococcus lactis subsp...
2016: PloS One
https://www.readbyqxmd.com/read/27930316/structural-basis-for-glutathione-mediated-activation-of-the-virulence-regulatory-protein-prfa-in-listeria
#6
Michael Hall, Christin Grundström, Afshan Begum, Mikael J Lindberg, Uwe H Sauer, Fredrik Almqvist, Jörgen Johansson, A Elisabeth Sauer-Eriksson
Infection by the human bacterial pathogen Listeria monocytogenes is mainly controlled by the positive regulatory factor A (PrfA), a member of the Crp/Fnr family of transcriptional activators. Published data suggest that PrfA requires the binding of a cofactor for full activity, and it was recently proposed that glutathione (GSH) could fulfill this function. Here we report the crystal structures of PrfA in complex with GSH and in complex with GSH and its cognate DNA, the hly operator PrfA box motif. These structures reveal the structural basis for a GSH-mediated allosteric mode of activation of PrfA in the cytosol of the host cell...
December 5, 2016: Proceedings of the National Academy of Sciences of the United States of America
https://www.readbyqxmd.com/read/27927881/brain-abscess-due-to-listeria-monocytogenes-after-hellp-syndrome-in-a-patient-with-antiphospholipid-syndrome
#7
A Fervienza, M Bodro, P Castro, S Hernández, I Teixidó, G Espinosa, R Cervera
OBJECTIVE: To illustrate an unusual case of Listeria cerebral abscess. MATERIAL AND METHODS: A 32-year-old pregnant woman with thrombotic antiphospholipid syndrome (APS) received corticotherapy for two weeks due to hemolysis, elevated liver enzymes, low platelet (HELLP) syndrome. After delivery she presented with neurological symptoms and fever. RESULTS: The MRI scan confirmed the presence of a brain abscess, and Listeria monocytogenes was isolated in blood cultures...
December 6, 2016: Lupus
https://www.readbyqxmd.com/read/27927165/innate-immunity-based-cancer-immunotherapy-b16-f10-murine-melanoma-model
#8
Veronika Caisová, Andra Vieru, Zuzana Kumžáková, Simona Glaserová, Hana Husníková, Nikol Vácová, Gabriela Krejčová, Lucie Paďouková, Ivana Jochmanová, Katherine I Wolf, Jindřich Chmelař, Jan Kopecký, Jan Ženka
BACKGROUND: Using killed microorganisms or their parts to stimulate immunity for cancer treatment dates back to the end of 19(th) century. Since then, it undergone considerable development. Our novel approach binds ligands to the tumor cell surface, which stimulates tumor phagocytosis. The therapeutic effect is further amplified by simultaneous application of agonists of Toll-like receptors. We searched for ligands that induce both a strong therapeutic effect and are safe for humans. METHODS: B16-F10 murine melanoma model was used...
December 7, 2016: BMC Cancer
https://www.readbyqxmd.com/read/27925492/antibacterial-antioxidant-and-anti-proliferative-properties-and-zinc-content-of-five-south-portugal-herbs
#9
Ricardo Nunes, Pawel Pasko, Malgorzata Tyszka-Czochara, Agnieszka Szewczyk, Marek Szlosarczyk, Isabel S Carvalho
CONTEXT: Crataegus monogyna L. (Rosaceae) (CM), Equisetum telmateia L. (Equisataceae) (ET), Geranium purpureum Vil. (Geraniaceae) (GP), Mentha suaveolens Ehrh. (Lamiaceae) (MS), and Lavandula stoechas L. spp. luisieri (Lamiaceae) (LS) are all medicinal. OBJECTIVE: To evaluate the antioxidant, antiproliferative and antimicrobial activities of plant extracts and quantify individual phenolics and zinc. MATERIAL AND METHODS: Aerial part extracts were prepared with water (W), ethanol (E) and an 80% mixture (80EW)...
December 2017: Pharmaceutical Biology
https://www.readbyqxmd.com/read/27920774/effects-of-tween-80-on-growth-and-biofilm-formation-in-laboratory-media
#10
Christina K Nielsen, Jørgen Kjems, Tina Mygind, Torben Snabe, Rikke L Meyer
Tween 80 is a widely used non-ionic emulsifier that is added to cosmetics, pharmaceuticals, and foods. Because of its widespread use we need to understand how it affects bacteria on our skin, in our gut, and in food products. The aim of this study is to investigate how Tween 80 affects the growth and antimicrobial susceptibility of Staphylococcus aureus, Listeria monocytogenes, and Pseudomonas fluorescens, which are common causes of spoilage and foodborne illnesses. Addition of 0.1% Tween 80 to laboratory growth media increased the growth rate of planktonic S...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27919756/molecular-identification-and-functional-delineation-of-a-glutathione-reductase-homologue-from-disk-abalone-haliotis-discus-discus-insights-as-a-potent-player-in-host-antioxidant-defense
#11
H M L P B Herath, P D S U Wickramasinghe, S D N K Bathige, R G P T Jayasooriya, Gi-Young Kim, Myoung Ae Park, Chul Kim, Jehee Lee
Glutathione reductase (GSR) is an enzyme that catalyzes the biochemical conversion of oxidized glutathione (GSSG) into the reduced form (GSH). Since the ratio between the two forms of glutathione (GSH/GSSG) is important for the optimal function of GSH to act as an antioxidant against H2O2, the contribution of GSR as an enzymatic regulatory agent to maintain the proper ratio is essential. Abalones are marine mollusks that frequently encounter environmental factors that can trigger the overproduction of reactive oxygen species (ROS) such as H2O2...
December 2, 2016: Fish & Shellfish Immunology
https://www.readbyqxmd.com/read/27919005/tracking-listeria-monocytogenes-contamination-and-virulence-associated-characteristics-in-the-ready-to-eat-meat-based-food-products-industry-according-to-the-hygiene-level
#12
A R Henriques, L T Gama, M J Fraqueza
Listeria monocytogenes isolates collected from final products and food contact surfaces of 10 ready-to-eat meat-based food products (RTEMP) producing industries were analyzed to relate their virulence-associated characteristics and genetic profiles with the hygiene assessment of those industries. Together with sample collection, an audit was performed to evaluate the implemented food safety management system and to investigate the specific audit requisites more associated to the occurrence of those L. monocytogenes serogroups frequently related with human disease...
November 21, 2016: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/27918204/removal-of-listeria-monocytogenes-dual-species-biofilms-using-combined-enzyme-benzalkonium-chloride-treatments
#13
Pedro Rodríguez-López, Alba Carballo-Justo, Lorraine A Draper, Marta L Cabo
The effects of pronase (PRN), cellulase (CEL) or DNaseI alone or combined with benzalkonium chloride (BAC) against Listeria monocytogenes-carrying biofilms were assayed. The best removal activity against L. monocytogenes-Escherichia coli biofilms was obtained using DNaseI followed by PRN and CEL. Subsequently, a modified logistic model was used to quantify the combined effects of PRN or DNaseI with BAC. A better BAC performance after PRN compared to DNaseI eradicating L. monocytogenes was observed. In E. coli the effects were the opposite...
December 5, 2016: Biofouling
https://www.readbyqxmd.com/read/27914079/assessing-vacuolar-escape-of-listeria-monocytogenes
#14
Juan J Quereda, Martin Sachse, Damien Balestrino, Théodore Grenier, Jennifer Fredlund, Anne Danckaert, Nathalie Aulner, Spencer Shorte, Jost Enninga, Pascale Cossart, Javier Pizarro-Cerdá
Listeria monocytogenes is a bacterial pathogen which invades and multiplies within non-professional phagocytes. Signaling cascades involved in cellular entry have been extensively analyzed, but the events leading to vacuolar escape remain less clear. In this chapter, we detail a microscopy FRET-based assay which allows quantitatively measuring L. monocytogenes infection and escape from its internalization vacuole, as well as a correlative light/electron microscopy method to investigate the morphological features of the vacuolar compartments containing L...
2017: Methods in Molecular Biology
https://www.readbyqxmd.com/read/27914001/subtilosin-prevents-biofilm-formation-by-inhibiting-bacterial-quorum-sensing
#15
Ammar Algburi, Saskia Zehm, Victoria Netrebov, Anzhelica B Bren, Vladimir Chistyakov, Michael L Chikindas
Subtilosin, the cyclic lantibiotic protein produced by Bacillus subtilis KATMIRA1933, targets the surface receptor and electrostatically binds to the bacterial cell membrane. In this study, subtilosin was purified using ammonium sulfate ((NH4)2SO4) precipitation and purified via column chromatography. Subtilosin's antibacterial minimum and sub-minimum inhibitory concentrations (MIC and sub-MIC) and anti-biofilm activity (biofilm prevention) were established. Subtilosin was evaluated as a quorum sensing (QS) inhibitor in Gram-positive bacteria using Fe(III) reduction assay...
December 2, 2016: Probiotics and Antimicrobial Proteins
https://www.readbyqxmd.com/read/27911410/experimental-infection-with-listeria-monocytogenes-as-a-model-for-studying-host-interferon-%C3%AE-responses
#16
Jeeyoon Jennifer Ahn, Thirumahal Selvanantham, Monan Angela Zhang, Thierry Mallevaey, Shannon E Dunn
L. monocytogenes is a gram-positive bacterium that is a cause of food borne disease in humans. Experimental infection of mice with this pathogen has been highly informative on the role of innate and adaptive immune cells and specific cytokines in host immunity against intracellular pathogens. Production of IFN-γ by innate cells during sublethal infection with L. monocytogenes is important for activating macrophages and early control of the pathogen(1-3). In addition, IFN-γ production by adaptive memory lymphocytes is important for priming the activation of innate cells upon reinfection(4)...
November 16, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27907153/the-majority-of-genotypes-of-the-virulence-gene-inla-are-intact-among-natural-watershed-isolates-of-listeria-monocytogenes-from-the-central-california-coast
#17
Lisa Gorski, Craig T Parker, Anita S Liang, Samarpita Walker, Kelly F Romanolo
Internalin A is an essential virulence gene involved in the uptake of the foodborne pathogen Listeria monocytogenes into host cells. It is intact in clinical strains and often truncated due to Premature Stop Codons (PMSCs) in isolates from processed foods and processing facilities. Less information is known about environmental isolates. We sequenced the inlA alleles and did Multi Locus Variable Number Tandem Repeat Analysis (MLVA) on 112 L. monocytogenes isolates from a 3-year period from naturally contaminated watersheds near a leafy green growing area in Central California...
2016: PloS One
https://www.readbyqxmd.com/read/27907048/chemical-defence-in-a-millipede-evaluation-and-characterization-of-antimicrobial-activity-of-the-defensive-secretion-from-pachyiulus-hungaricus-karsch-1881-diplopoda-julida-julidae
#18
Slaviša Stanković, Ivica Dimkić, Ljubodrag Vujisić, Sofija Pavković-Lučić, Zvezdana Jovanović, Tatjana Stević, Ivana Sofrenić, Bojan Mitić, Vladimir Tomić
The chemical defence of the millipede Pachyiulus hungaricus is reported in the present paper, in which a chemical characterization is given and antimicrobial activity is determined. In total, independently of sex, 44 compounds were identified. All compounds belong to two groups: quinones and pentyl and hexyl esters of long-chain fatty acids. The relative abundances of quinones and non-quinones were 94.7% vs. 5.3% (males) and 87.3% vs. 12.7% (females), respectively. The two dominant quinones in both sexes were 2-methyl-1,4,-benzoquinone and 2-methoxy-3-methyl-1,4-benzoquinone...
2016: PloS One
https://www.readbyqxmd.com/read/27906992/a-dual-filtration-based-multiplex-pcr-method-for-simultaneous-detection-of-viable-escherichia-coli-o157-h7-listeria-monocytogenes-and-staphylococcus-aureus-on-fresh-cut-cantaloupe
#19
Ke Feng, Wenzhong Hu, Aili Jiang, Sarengaowa, Yongping Xu, Yu Zou, Liu Yang, Xin Wang
Fresh-cut cantaloupe is particularly susceptible to contamination with pathogenic bacteria, such as Escherichia coli O157:H7, Listeria monocytogenes, and Staphylococcus aureus. Therefore, development of rapid, yet accurate detection techniques is necessary to ensure food safety. In this study, a multiplex PCR system and propidium monoazide (PMA) concentration were optimized to detect all viable pathogens in a single tube. A dual filtration system utilized a filtration membrane with different pore sizes to enrich pathogens found on fresh-cut cantaloupe...
2016: PloS One
https://www.readbyqxmd.com/read/27904893/assay-for-listeria-monocytogenes-cells-in-whole-blood-using-isotachophoresis-and-recombinase-polymerase-amplification
#20
Charbel Eid, Juan G Santiago
We present a new approach which enables lysis, extraction, and detection of inactivated Listeria monocytogenes cells from blood using isotachophoresis (ITP) and recombinase polymerase amplification (RPA). We use an ITP-compatible alkaline and proteinase K approach for rapid and effective lysis. We then perform ITP purification to separate bacterial DNA from whole blood contaminants using a microfluidic device that processes 25 μL sample volume. Lysis, mixing, dispensing, and on-chip ITP purification are completed in a total of less than 50 min...
December 1, 2016: Analyst
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