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https://www.readbyqxmd.com/read/28635414/core-shell-pla-pva-porous-microparticles-as-carriers-for-bacteriocin-nisin
#1
Pavlina Holcapkova, Martina Hrabalikova, Petra Stoplova, Vladimir Sedlarik
This work is focused on preparation of novel porous type of core-shell-structured microparticles based on polylactide (shell) and poly(vinyl alcohol) cross-linked with glutaric acid (GA) (core) prepared by water-in-oil-in-water solvent evaporation technique. The microparticle systems were used as delivery systems for immobilisation of model antibacterial agent - nisin. The effect of cross-linking and the initial amount of nisin on their morphology was investigated using scanning electron microscopy, BET analysis, zeta potential measurement and Fourier transform infra-red spectroscopy...
June 21, 2017: Journal of Microencapsulation
https://www.readbyqxmd.com/read/28633051/influence-of-lactic-acid-and-post-treatment-recovery-time-on-the-heat-resistance-of-listeria-monocytogenes
#2
Yasuo Omori, Kiyotaka Miake, Hiromi Nakamura, Eriko Kage-Nakadai, Yoshikazu Nishikawa
The aim of this study was to evaluate the effect of lactic acid (LA) with and without organic material at various post-treatment recovery times on the heat resistance of Listeria monocytogenes (Lm). LA decreased Lm numbers; however, the effect was remarkably attenuated by the presence of organic matter. Five strains of Lm were treated with LA and the listericidal effects were compared. The effect of LA varied depending on the strain, with ≥3.0% (w/w) LA required to kill the Lm strains in a short time. The heat resistance of Lm treated with LA was examined with respect to the time interval between the acid treatment and the subsequent manufacturing step...
June 12, 2017: International Journal of Food Microbiology
https://www.readbyqxmd.com/read/28632414/changing-us-population-demographics-what-does-this-mean-for-listeriosis-incidence-and-exposure
#3
Aurelie M Pohl, Régis Pouillot, Jane M Van Doren
Listeria monocytogenes is an important cause of foodborne illness hospitalization, fetal loss, and death in the United States. Listeriosis incidence rate varies significantly among population subgroups with pregnant women, older persons, and the Hispanic population having increased relative risks compared with the other subpopulations. Using estimated rates of listeriosis per subpopulation based on FoodNet data from 2004 to 2009, we evaluate the expected number of cases and incidence rates of listeriosis in the US population and the pregnant women subpopulation as the demographic composition changes over time with respect to ethnicity, pregnancy status, and age distribution...
June 20, 2017: Foodborne Pathogens and Disease
https://www.readbyqxmd.com/read/28630160/listeriolysin-o-from-bazooka-to-swiss-army-knife
#4
REVIEW
Suzanne E Osborne, John H Brumell
Listeria monocytogenes (Lm) is a Gram-positive facultative intracellular pathogen. Infections in humans can lead to listeriosis, a systemic disease with a high mortality rate. One important mechanism of Lm dissemination involves cell-to-cell spread after bacteria have entered the cytosol of host cells. Listeriolysin O (LLO; encoded by the hly gene) is a virulence factor present in Lm that plays a central role in the cell-to-cell spread process. LLO is a member of the cholesterol-dependent cytolysin (CDC) family of toxins that were initially thought to promote disease largely by inducing cell death and tissue destruction-essentially acting like a 'bazooka'...
August 5, 2017: Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
https://www.readbyqxmd.com/read/28630144/crmp-1-enhances-evl-mediated-actin-elongation-to-build-lamellipodia-and-the-actin-cortex
#5
Hui-Chia Yu-Kemp, James P Kemp, William M Brieher
Cells can control actin polymerization by nucleating new filaments or elongating existing ones. We recently identified CRMP-1 as a factor that stimulates the formation of Listeria monocytogenes actin comet tails, thereby implicating it in actin assembly. We now show that CRMP-1 is a major contributor to actin assembly in epithelial cells, where it works with the Ena/VASP family member EVL to assemble the actin cytoskeleton in the apical cortex and in protruding lamellipodia. CRMP-1 and EVL bind to one another and together accelerate actin filament barbed-end elongation...
June 19, 2017: Journal of Cell Biology
https://www.readbyqxmd.com/read/28630063/listeria-vectored-vaccine-expressing-the-mycobacterium-tuberculosis-30-kda-major-secretory-protein-via-the-constitutively-active-prfa-regulon-boosts-bcg-efficacy-against-tuberculosis
#6
Qingmei Jia, Barbara Jane Dillon, Saša Masleša-Galić, Marcus A Horwitz
A potent vaccine against tuberculosis, one of the world's deadliest diseases, is needed to enhance the immunity of people worldwide, most of whom have been vaccinated with the partially effective BCG vaccine. Here we investigate novel live attenuated recombinant Listeria monocytogenes (rLm) vaccines expressing the Mycobacterium tuberculosis (Mtb) 30 kDa major secretory protein (r30/Ag85B) (rLm30) as heterologous booster vaccines in animals primed with BCG. Using three attenuated Lm vectors, rLm ΔactA (LmI), rLm ΔactA ΔinlB (LmII), and rLm ΔactA ΔinlBprfA* (LmIII), we constructed five rLm30 vaccine candidates expressing the r30 linked in-frame to the Lm Listeriolycin O signal sequence and driven by the hly promoter (h30) or linked in-frame to the ActA N-terminus and driven by the actA promoter (a30)...
June 19, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28629969/prevalence-and-serotype-distribution-of-listeria-monocytogenes-isolated-from-foods-in-montevideo-uruguay
#7
Valeria Braga, Sylvia Vázquez, Victoria Vico, Valeria Pastorino, María Inés Mota, Marcela Legnani, Felipe Schelotto, Gustavo Lancibidad, Gustavo Varela
The aim of this work was to study the prevalence of Listeria monocytogenes in foods obtained in retail shops and food industries located in Montevideo-Uruguay, and to identify the serogroups of the obtained isolates. Three-thousand one-hundred and seventy-five food samples (frozen, deli meats, ready-to-eat and cheese) were analyzed. The obtained isolates were serogrouped by multiplex PCR and serotyped by conventional procedure. Genetic comparisons were performed using pulsed-field gel electrophoresis on a sub-set of isolates belonging to the same serotype successively recovered from the same establishment...
June 3, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28628486/inactivation-of-bacterial-biofilms-by-visible-light-activated-unmodified-zno-nanorods
#8
Kristina Aponiene, Tomas Serevičius, Zivile Luksiene, Saulius Jursenas
Various zinc oxide (ZnO) nanostructures are widely used for photocatalytic antibacterial applications. Since ZnO possess a wide bandgap, it is believed that only UV light may efficiently assist bacterial inactivation and diverse crystal lattice modifications should be applied in order to narrow the bandgap for efficient visible light absorption. In this work we show that even unmodified ZnO nanorods grown by aqueous chemical growth technique were found to possess intrinsic defects which can be activated by visible light ( = 405 nm) and successfully applied for total inactivation of various highly resistant bacterial biofilms rather than more sensitive planktonic bacteria...
June 19, 2017: Nanotechnology
https://www.readbyqxmd.com/read/28625982/the-novel-stress-survival-islet-2-ssi-2-predominantly-present-in-listeria-monocytogenes-strains-of-st121-is-involved-in-alkaline-and-oxidative-stress-response
#9
Eva Harter, Eva Maria Wagner, Andreas Zaiser, Sabrina Halecker, Martin Wagner, Kathrin Rychli
The food-borne pathogen Listeria (L) monocytogenes is able to survive a variety of stress conditions leading to the colonization of different niches like the food processing environment. This study focuses on the hypervariable genetic hotspot lmo0443-lmo0449 haboring three inserts: the stress survival islet 1 (SSI-1), the single-gene insert LMOf2365_0481 and two homologous genes of the non-pathogenic species L. innocua: lin0464, a putative transcriptional regulator and lin0465, an intracellular PfpI protease...
June 16, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28621585/inactivation-of-nonpathogenic-escherichia-coli-escherichia-coli-o157-h7-salmonella-enterica-typhimurium-and-listeria-monocytogenes-in-ice-using-a-uvc-light-emitting-diode
#10
Suguru Murashita, Shuso Kawamura, Shigenobu Koseki
Ice, widely used in the food industry, is a potential cause of food poisoning resulting from microbial contamination. Direct microbial inactivation of ice is necessary because microorganisms may have been present in the source water used to make it and/or may have been introduced due to poor hygiene during production or handling of the ice. Nonthermal and nondestructive microbial inactivation technologies are needed to control microorganisms in ice. We evaluated the applicability of a UVC light-emitting diode (UVC-LED) for microbial inactivation in ice...
June 16, 2017: Journal of Food Protection
https://www.readbyqxmd.com/read/28620364/a-multiplex-rt-pcr-assay-for-s-aureus-l-monocytogenes-and-salmonella-spp-detection-in-raw-milk-with-pre-enrichment
#11
Tian Ding, Yuanjie Suo, Zhaohuan Zhang, Donghong Liu, Xingqian Ye, Shiguo Chen, Yong Zhao
This study firstly developed a multiplex real-time PCR (RT-PCR) technique combined with a pre-enrichment step to simultaneously detect Staphylococcus aureus (S. aureus), Listeria monocytogenes (L. monocytogenes) and Salmonella spp. in raw milk and the dairy farm environment (feces, soil, feed, water) in one reaction. Brain heart infusion (BHI) broth was selected for the enrichment step to increase the density of the target bacteria by using an incubation of 4 h before multiplex RT-PCR. The results showed that the detection limit of the multiplex real-time assay was approximately 10(2) CFU/mL for pure cultures and artificially contaminated milk without enrichment, while 12, 14, and 10 CFU/25 mL, respectively, for S...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28619811/full-genome-sequence-of-listeria-monocytogenes-strain-h34-isolated-from-a-newborn-with-sepsis-in-uruguay
#12
Francis Muchaamba, Claudia Guldimann, Taurai Tasara, María Inés Mota, Valeria Braga, Gustavo Varela, Gabriela Algorta, Jochen Klumpp, Marco Jermini, Roger Stephan
The foodborne pathogen Listeria monocytogenes causes severe disease mainly in the vulnerable populations of the young, old, pregnant, and immunocompromised. Here, we present the genome sequence of L. monocytogenes H34, a serotype 1/2b, lineage I, sequence type 489 (ST489) strain, isolated from a neonatal sepsis case in Uruguay.
June 15, 2017: Genome Announcements
https://www.readbyqxmd.com/read/28619007/whole-genome-sequencing-analyses-of-listeria-monocytogenes-that-persisted-in-a-milkshake-machine-for-a-year-and-caused-illnesses-in-washington-state
#13
Zhen Li, Ailyn Pérez-Osorio, Yu Wang, Kaye Eckmann, William A Glover, Marc W Allard, Eric W Brown, Yi Chen
BACKGROUND: In 2015, in addition to a United States multistate outbreak linked to contaminated ice cream, another outbreak linked to ice cream was reported in the Pacific Northwest of the United States. It was a hospital-acquired outbreak linked to milkshakes, made from contaminated ice cream mixes and milkshake maker, served to patients. Here we performed multiple analyses on isolates associated with this outbreak: pulsed-field gel electrophoresis (PFGE), whole genome single nucleotide polymorphism (SNP) analysis, species-specific core genome multilocus sequence typing (cgMLST), lineage-specific cgMLST and whole genome-specific MLST (wgsMLST)/outbreak-specific cgMLST...
June 15, 2017: BMC Microbiology
https://www.readbyqxmd.com/read/28617325/development-of-biopolymer-composite-films-using-a-microfluidization-technique-for-carboxymethylcellulose-and-apple-skin-particles
#14
Inyoung Choi, Yoonjee Chang, So-Hyang Shin, Eunmi Joo, Hyun Ju Song, Haeyoung Eom, Jaejoon Han
Biopolymer films based on apple skin powder (ASP) and carboxymethylcellulose (CMC) were developed with the addition of apple skin extract (ASE) and tartaric acid (TA). ASP/CMC composite films were prepared by mixing CMC with ASP solution using a microfluidization technique to reduce particle size. Then, various concentrations of ASE and TA were incorporated into the film solution as an antioxidant and an antimicrobial agent, respectively. Fourier transform infrared (FTIR), optical, mechanical, water barrier, and solubility properties of the developed films were then evaluated to determine the effects of ASE and TA on physicochemical properties...
June 15, 2017: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/28616745/bacterial-meningitis-complicating-the-course-of-liver-cirrhosis
#15
Pasquale Pagliano, Giovanni Boccia, Francesco De Caro, Silvano Esposito
Meningitis is rarely reported in studies investigating bacterial infections in patients affected by liver cirrhosis. We investigated the findings of bacterial meningitis in patients affected by liver cirrhosis referred to our department in a 16-year period. MATERIALS: Patients with cirrhosis and bacterial meningitis were enrolled. Cirrhosis was defined by liver histology or clinical, laboratory, and ultrasonographic and endoscopic findings. Bacterial meningitis was defined by cerebro-spinal fluid pleocytosis (>10/mcl) and characteristic clinical presentation...
June 14, 2017: Infection
https://www.readbyqxmd.com/read/28611744/rnaseq-reveals-complex-response-of-campylobacter-jejuni-to-ovine-bile-and-in-vivo-gallbladder-environment
#16
Amanda J Kreuder, Jennifer A Schleining, Michael Yaeger, Qijing Zhang, Paul J Plummer
Colonization of the gallbladder by enteric pathogens such as Salmonella typhi, Listeria monocytogenes, and Campylobacter jejuni is thought to play a key role in transmission and persistence of these important zoonotic agents; however, little is known about the molecular mechanisms that allow for bacterial survival within this harsh environment. Recently, a highly virulent C. jejuni sheep abortion (SA) clone represented by the clinical isolate IA3902 has emerged as the dominant cause for sheep abortion in the United States...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28607020/targeting-quorum-sensing-signal-biosynthesis-to-fight-antibiotic-resistant-infections-ambuic-acid-as-a-model-inhibitor
#17
Daniel A Todd, Corey P Parlet, Heidi A Crosby, Cheryl L Malone, Kristopher P Heilmann, Alexander R Horswill, Nadja B Cech
There has been major interest by the scientific community in anti-virulence approaches against bacterial infections. However, partly due to a lack of viable lead compounds, anti-virulence therapeutics have yet to reach the clinic. Here we investigate the development of an anti-virulence lead targeting quorum sensing signal-biosynthesis, a process that is conserved in Gram positive bacterial pathogens. Some preliminary studies suggest that the small molecule ambuic acid is a signal biosynthesis inhibitor. To confirm this, we construct a methicillin-resistant Staphylococcus aureus (MRSA) strain that decouples AIP production from regulation, and demonstrate that AIP production is inhibited in this mutant...
June 12, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28605978/isolation-and-preliminary-characterization-of-a-bacteriocin-producer-bacillus-strain-inhibiting-methicillin-resistant-staphylococcus-aureus
#18
Ankit Kumar Chauhan, Dinesh Kumar Maheshwari, Vivek K Bajpai
In a multivalent approach to discover new antimicrobial substance, a total of 160 Bacilli were isolated from termitarium soil, characterized on the basis of their morphological and physiological characters and screened for their antimicrobial activity by agar well diffusion method against certain drug resistant pathogenic bacteria such as Staphylococcus aureus, Methicillin resistant Staphylococcus aureus and common food contaminating bacteria Listeria monocytogenes. After preliminary screening, sixteen isolates showed inhibitory activity against test pathogens...
June 2017: Acta Biologica Hungarica
https://www.readbyqxmd.com/read/28604598/influence-of-food-characteristics-and-food-additives-on-the-antimicrobial-effect-of-garlic-and-oregano-essential-oils
#19
Juan García-Díez, Joana Alheiro, Ana Luisa Pinto, Luciana Soares, Virgilio Falco, Maria João Fraqueza, Luis Patarata
Utilization of essential oils (EOs) as antimicrobial agents against foodborne disease has gained importance, for their use as natural preservatives. Since potential interactions between EOs and food characteristics may affect their antimicrobial properties, the present work studies the influence of fat, protein, pH, aw and food additives on the antimicrobial effect of oregano and garlic EOs against Salmonella spp. and Listeria monocytogenes. Results showed that protein, pH, aw, presence of beef extract, sodium lactate and nitrates did not influence their antimicrobial effect...
June 10, 2017: Foods (Basel, Switzerland)
https://www.readbyqxmd.com/read/28604176/irrigation-water-sources-and-time-intervals-as-variables-on-the-presence-of-campylobacter-spp-and-listeria-monocytogenes-on-romaine-lettuce-grown-in-muck-soil
#20
Evelyne Guévremont, Lisyanne Lamoureux, Mylène Généreux, Caroline Côté
Irrigation water has been identified as a possible source of vegetable contamination by foodborne pathogens. Risk management for pathogens such as Campylobacter spp. and Listeria monocytogenes in fields can be influenced by the source of the irrigation water and the time interval between last irrigation and harvest. Plots of romaine lettuce were irrigated with manure-contaminated water or aerated pond water 21, 7, or 3 days prior to harvesting, and water and muck soil samples were collected at each irrigation treatment...
June 12, 2017: Journal of Food Protection
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