keyword
MENU ▼
Read by QxMD icon Read
search

persister cells in biofilm

keyword
https://www.readbyqxmd.com/read/28314729/efficacy-of-a-sonicating-swab-for-removal-and-capture-of-listeria-monocytogenes-in-biofilm-on-stainless-steel
#1
Tobyn A Branck, Matthew J Hurley, Gianna N Prata, Christina A Crivello, Patrick J Marek
Listeria monocytogenes is of great concern in food processing facilities because it persists in biofilms, potentiating biotransfer. Stainless steel is commonly used for food contact surfaces and transport containers. L. monocytogenes biofilm on stainless steel served as a model system for surface sampling to test the performance of a sonicating swab in comparison to a standard cotton swab. Swab performance and consistency were determined using total viable counts. Stainless steel coupons sampled with both swabs were examined with SEM to visualize biofilms and surface structures (i...
March 17, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28303897/synergistic-efficacy-of-bisbenzimidazole-and-carbonyl-cyanide-3-chlorophenylhydrazone-combination-against-mdr-bacterial-strains
#2
Devapriya Sinha, Stuti Pandey, Raja Singh, Vinod Tiwari, Kirti Sad, Vibha Tandon
Activation of efflux systems and the formation of biofilm are majorly adapted by microbes to resist antimicrobial agents. PPEF (bisbenzimidazole) targeting topoisomerase IA is observed to be an effective bactericidal agent against both Gram-positive and Gram-negative bacterial strains and thus can be developed as potent broad-spectrum antibiotic against MDR strains. PPEF treatment did not cause target specific mutation instead it leads to up-regulation of efflux gene in E. coli K12 as a mechanism of resistance...
March 17, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28274550/explorative-gene-analysis-of-antibiotic-tolerance-related-genes-in-adherent-and-biofilm-cells-of-pseudomonas-aeruginosa
#3
Keiji Murakami, Tsuneko Ono, Yasuki Noma, Issei Minase, Takashi Amoh, Yasuhiko Irie, Katsuhiko Hirota, Yoichiro Miyake
BACKGROUND: Antibiotic tolerance has attracted worldwide attention, as it leads to chronic, refractory, and persistent infections that are difficult to control. Bacterial biofilms are well known to be more tolerant to antibiotics compared to planktonic bacteria. We previously revealed that adherent bacteria on a solid surface also exhibited tolerance to antibiotics before forming a biofilm. However, little is known about the mechanisms of antibiotic tolerance for adherent or biofilm cells...
March 5, 2017: Journal of Infection and Chemotherapy: Official Journal of the Japan Society of Chemotherapy
https://www.readbyqxmd.com/read/28258231/antibiotic-tolerance-and-the-alternative-lifestyles-of-staphylococcus-aureus
#4
REVIEW
Long M G Bui, Brian P Conlon, Stephen P Kidd
Staphylococcus aureus has an incredible ability to survive, either by adapting to environmental conditions or defending against exogenous stress. Although there are certainly important genetic traits, in part this ability is provided by the breadth of modes of growth S. aureus can adopt. It has been proposed that while within their host, S. aureus survives host-generated and therapeutic antimicrobial stress via alternative lifestyles: a persister sub-population, through biofilm growth on host tissue or by growing as small colony variants (SCVs)...
February 28, 2017: Essays in Biochemistry
https://www.readbyqxmd.com/read/28258142/activation-mechanism-and-cellular-localization-of-membrane-anchored-alginate-polymerase-in-pseudomonas-aeruginosa
#5
M Fata Moradali, Shirin Ghods, Bernd H A Rehm
The exopolysaccharide, alginate, produced by the opportunistic human pathogen Pseudomonas aeruginosa represents a survival advantage by contributing to formation of characteristic biofilms during infection. Membrane anchored proteins Alg8 (catalytic subunit) and Alg44 (co-polymerase) constitute the alginate polymerase which is being activated by the second messenger molecule c-di-GMP, but the mechanism of activation remains elusive. To shed light on the c-di-GMP mediated activation of alginate polymerization in vivo, an in silico structural model of Alg8 fused to the c-di-GMP binding PilZ domain informed by the structure of cellulose synthase, BcsA, was developed...
March 3, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28237889/giardia-duodenalis-induces-pathogenic-dysbiosis-of-human-intestinal-microbiota-biofilms
#6
Jennifer K Beatty, Sarah V Akierman, Jean-Paul Motta, Stacy Muise, Matthew L Workentine, Joe J Harrison, Amol Bhargava, Paul L Beck, Kevin P Rioux, Gordon Webb McKnight, John L Wallace, Andre G Buret
Giardia duodenalis is a prevalent cause of acute diarrheal disease worldwide. However, recent outbreaks in Italy and Norway have revealed a link between giardiasis and the subsequent development of chronic post-infectious irritable bowel syndrome. While the mechanisms underlying the causation of post-infectious irritable bowel syndrome remain obscure, recent findings suggest that alterations in gut microbiota communities are linked to the pathophysiology of irritable bowel syndrome. In the present study, we use a laboratory biofilm system to culture and enrich mucosal microbiota from human intestinal biopsies...
February 22, 2017: International Journal for Parasitology
https://www.readbyqxmd.com/read/28237677/growth-viability-and-architecture-of-biofilms-of-listeria-monocytogenes-formed-on-abiotic-surfaces
#7
Fernanda Barbosa Dos Reis-Teixeira, Virgínia Farias Alves, Elaine Cristina Pereira de Martinis
The pathogenic bacterium Listeria monocytogenes can persist in food processing plants for many years, even when appropriate hygienic measures are in place, with potential for contaminating ready-to-eat products and, its ability to form biofilms on abiotic surfaces certainly contributes for the environmental persistence. In this research, L. monocytogenes was grown in biofilms up 8 days attached to stainless steel and glass surfaces, contributing for advancing the knowledge on architecture of mature biofilms, since many literature studies carried out on this topic considered only early stages of cell adhesion...
February 9, 2017: Brazilian Journal of Microbiology: [publication of the Brazilian Society for Microbiology]
https://www.readbyqxmd.com/read/28169510/differences-in-internalization-and-growth-of-escherichia-coli-o157-h7-within-the-apoplast-of-edible-plants-spinach-and-lettuce-compared-with-the-model-species-nicotiana-benthamiana
#8
Kathryn M Wright, Louise Crozier, Jacqueline Marshall, Bernhard Merget, Ashleigh Holmes, Nicola J Holden
Internalization of food-borne bacteria into edible parts of fresh produce plants represents a serious health risk. Therefore, internalization of verocytotoxigenic E. coli O157:H7 isolate Sakai was assessed in two species associated with outbreaks, spinach (Spinacia oleracea) and lettuce (Lactuca sativa) and compared to the model species Nicotiana benthamiana. Internalization occurred in the leaves and roots of spinach and lettuce throughout a 10 day time-course. The plant species, tissue type and inoculum dose all impacted the outcome...
February 7, 2017: Microbial Biotechnology
https://www.readbyqxmd.com/read/28167931/the-active-component-of-aspirin-salicylic-acid-promotes-staphylococcus-aureus-biofilm-formation-in-a-pia-dependent-manner
#9
Cristian Dotto, Andrea Lombarte Serrat, Natalia Cattelan, María S Barbagelata, Osvaldo M Yantorno, Daniel O Sordelli, Monika Ehling-Schulz, Tom Grunert, Fernanda R Buzzola
Aspirin has provided clear benefits to human health. But salicylic acid (SAL) -the main aspirin biometabolite- exerts several effects on eukaryote and prokaryote cells. SAL can affect, for instance, the expression of Staphylococcus aureus virulence factors. SAL can also form complexes with iron cations and it has been shown that different iron chelating molecules diminished the formation of S. aureus biofilm. The aim of this study was to elucidate whether the iron content limitation caused by SAL can modify the S...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28167629/il-10-plays-opposing-roles-during-staphylococcus-aureus-systemic-and-localized-infections
#10
John M Leech, Keenan A Lacey, Michelle E Mulcahy, Eva Medina, Rachel M McLoughlin
IL-10 is a potent anti-inflammatory mediator that plays a crucial role in limiting host immunopathology during bacterial infections by controlling effector T cell activation. Staphylococcus aureus has previously been shown to manipulate the IL-10 response as a mechanism of immune evasion during chronic systemic and biofilm models of infection. In the present study, we demonstrate divergent roles for IL-10 depending on the site of infection. During acute systemic S. aureus infection, IL-10 plays an important protective role and is required to prevent bacterial dissemination and host morbidity by controlling effector T cells and the associated downstream hyperactivation of inflammatory phagocytes, which are capable of host tissue damage...
March 15, 2017: Journal of Immunology: Official Journal of the American Association of Immunologists
https://www.readbyqxmd.com/read/28159787/biofilm-formation-on-stainless-steel-in-milk-environment-is-mediated-by-the-proteinase-prts-in-streptococcus-thermophilus-uc8547
#11
D Bassi, F Cappa, S Gazzola, L Orrù, P S Cocconcelli
In Streptococcus thermophilus gene transfer events and loss of ancestral traits during years contribute to its high adaptation to the milk environment. Biofilm formation capacity, a phenotype that is lost in the majority of strains, plays a role in the persistence in dairy environments, such as milk pasteurisation and cheese manufacturing plants. To investigate on this property, we have studied S. thermophilus UC8547, a fast acidifying dairy starter culture, selected for its high capacity to form biofilm on stainless steel in environmental conditions resembling the dairy environment...
February 3, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28150898/biofilm-formation-invasiveness-and-colicinogeny-in-locus-of-enterocyte-and-effacement-negative-o113-h21-shigatoxigenic-escherichia-coli
#12
L F Dos Santos, F T Biscola, E M Gonçalves, B E C Guth
AIMS: Although Shiga toxins (Stx) are well-established virulence traits of O113:H21 Shigatoxigenic Escherichia coli (STEC) strains, a shortage in the knowledge of other virulence properties that may contribute to pathogenesis may exist in this serotype. This study investigated biofilm, invasiveness and colicinogeny capabilities in O113:H21 STEC isolated in Brazil, mostly from animal reservoirs. A search for genes that were reported to participate in the process of biofilm formation was also performed...
April 2017: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/28138928/analysis-of-pseudomonas-aeruginosa-pao1-biofilm-protein-profile-after-exposure-to-n-butanolic-cyclamen-coum-extract-alone-and-in-combination-with-ciprofloxacin
#13
Morvarid Shafiei, Ahya Abdi-Ali, Fereshteh Shahcheraghi, Hojatollah Vali, Hossein Shahbani Zahiri, Kambiz Akbari Noghabi
Pseudomonas aeruginosa biofilm-related infections are the major cause of premature death in cystic fibrosis patients. Strategies to induce biofilm dispersal are of interest, because of their potential in preventing biofilm-related infections. Our previous work demonstrated that n-butanolic Cyclamen coum extract with ciprofloxacin could eliminate 1- and 3-day-old P. aeruginosa PAO1 biofilms. To gain new insights into the role of C. coum extract and its synergistic effect with ciprofloxacin in eliminating P. aeruginosa PAO1 biofilms, two-dimensional gel electrophoresis (2-DE) in combination with mass spectrometry-based protein identification were used...
January 30, 2017: Applied Biochemistry and Biotechnology
https://www.readbyqxmd.com/read/28132897/targeting-biofilms-and-persisters-of-eskape-pathogens-with-p14kans-a-kanamycin-peptide-conjugate
#14
Mohamed F Mohamed, Anna Brezden, Haroon Mohammad, Jean Chmielewski, Mohamed N Seleem
BACKGROUND: The worldwide emergence of antibiotic resistance represents a serious medical threat. The ability of these resistant pathogens to form biofilms that are highly tolerant to antibiotics further aggravates the situation and leads to recurring infections. Thus, new therapeutic approaches that adopt novel mechanisms of action are urgently needed. To address this significant problem, we conjugated the antibiotic kanamycin with a novel antimicrobial peptide (P14LRR) to develop a kanamycin peptide conjugate (P14KanS)...
April 2017: Biochimica et Biophysica Acta
https://www.readbyqxmd.com/read/28115132/characterization-of-bacterial-community-dynamics-in-a-full-scale-drinking-water-treatment-plant
#15
Cuiping Li, Fangqiong Ling, Minglu Zhang, Wen-Tso Liu, Yuxian Li, Wenjun Liu
Understanding the spatial and temporal dynamics of microbial communities in drinking water systems is vital to securing the microbial safety of drinking water. The objective of this study was to comprehensively characterize the dynamics of microbial biomass and bacterial communities at each step of a full-scale drinking water treatment plant in Beijing, China. Both bulk water and biofilm samples on granular activated carbon (GAC) were collected over 9months. The proportion of cultivable cells decreased during the treatment processes, and this proportion was higher in warm season than cool season, suggesting that treatment processes and water temperature probably had considerable impact on the R2A cultivability of total bacteria...
January 2017: Journal of Environmental Sciences (China)
https://www.readbyqxmd.com/read/28112955/fate-of-eight-different-polymers-under-uncontrolled-composting-conditions-relationships-between-deterioration-biofilm-formation-and-the-material-surface-properties
#16
Anne Mercier, Kevin Gravouil, Willy Aucher, Sandra Brosset-Vincent, Linette Kadri, Jenny Colas, Didier Bouchon, Thierry Ferreira
With the ever-increasing volume of polymer wastes and their associated detrimental impacts on the environment, the plastic life cycle has drawn increasing attention. Here, eight commercial polymers selected from biodegradable to environmentally persistent materials, all formulated under a credit card format, were incubated in an outdoor compost to evaluate their fate over time and to profile the microbial communities colonizing their surfaces. After 450 days in compost, the samples were all colonized by multispecies biofilms, these latest displaying different amounts of adhered microbial biomass and significantly distinct bacterial and fungal community compositions depending on the substrate...
February 8, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28112760/the-anti-inflammatory-drug-mesalamine-targets-bacterial-polyphosphate-accumulation
#17
Jan-Ulrik Dahl, Michael J Gray, Daphne Bazopoulou, Francois Beaufay, Justine Lempart, Mark J Koenigsknecht, Ying Wang, Jason R Baker, William L Hasler, Vincent B Young, Duxin Sun, Ursula Jakob
Mesalamine serves as the gold standard in treating ulcerative colitis. However, its precise mechanism(s) of action remains unclear. Here, we show that mesalamine treatment rapidly decreases polyphosphate levels in diverse bacteria, including members of the human gut microbiome. This decrease sensitizes bacteria towards oxidative stress, reduces colonization and attenuates persister cell and biofilm formation, suggesting that mesalamine aids in diminishing the capacity of bacteria to persist within chronically inflamed environments...
January 23, 2017: Nature Microbiology
https://www.readbyqxmd.com/read/28111984/effects-of-meropenem-exposure-in-persister-cells-of-acinetobacter-calcoaceticus-baumannii
#18
Stephanie Wagner Gallo, Bruna Kern Donamore, Vany Elisa Pagnussatti, Carlos Alexandre Sanchez Ferreira, Sílvia Dias de Oliveira
AIM: To evaluate the influence of meropenem in the Acinetobacter calcoaceticus-baumannii (ACB) persister levels. METHODS: Persister levels in planktonic and biofilm cultures from ACB isolates were evaluated after exposure to different meropenem concentrations. RESULTS: A high variability of persister fractions was observed among the isolates cultured under planktonic and biofilm conditions. Meropenem concentration did not influence persister fractions, even when far above the MIC...
January 23, 2017: Future Microbiology
https://www.readbyqxmd.com/read/28110918/nitroxoline-a-broad-spectrum-biofilm-eradicating-agent-against-pathogenic-bacteria
#19
Yasmeen Abouelhassan, Qingping Yang, Hussain Yousaf, Minh Thu Nguyen, Melanie Rolfe, Gregory S Schultz, Robert W Huigens
Bacterial biofilms are surface-attached communities of slow-growing or non-replicating bacteria tolerant to conventional antibiotic therapies. Although biofilms are known to occur in ca. 80% of all bacterial infections, no therapeutic agent has been developed to eradicate bacteria housed within biofilms. We have discovered that nitroxoline, an antibacterial agent used to treat urinary tract infections, displays broad-spectrum biofilm-eradicating activities against major human pathogens, including drug-resistant Staphylococcus aureus and Acinetobacter baumannii strains...
February 2017: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/28073080/impact-of-environmental-factors-on-the-culturability-and-viability-of-listeria-monocytogenes-under-conditions-encountered-in-food-processing-plants
#20
Anaïs Overney, Joséphine Jacques-André-Coquin, Patricia Ng, Brigitte Carpentier, Laurent Guillier, Olivier Firmesse
The ability of Listeria monocytogenes to adhere to and persist on surfaces for months or even years may be responsible for its transmission from contaminated surfaces to food products. Hence the necessity to find effective means to prevent the establishment of L. monocytogenes in food processing environments. The aim of this study was to assess, through a fractional experimental design, the environmental factors that could affect the survival of L. monocytogenes cells on surfaces to thereby prevent the persistence of this pathogen in conditions mimicking those encountered in food processing plants: culture with smoked salmon juice or meat exudate, use of two materials with different hygiene status, biofilm of L...
March 6, 2017: International Journal of Food Microbiology
keyword
keyword
116555
1
2
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read
×

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"