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https://www.readbyqxmd.com/read/28088662/metabolic-profiles-of-exudates-from-chronic-leg-ulcerations
#1
Adam Junka, Wojciech Wojtowicz, Adam Ząbek, Grzegorz Krasowski, Danuta Smutnicka, Barbara Bakalorz, Agnieszka Boruta, Mariusz Dziadas, Piotr Młynarz, Parish Paymon Sedghizadeh, Marzenna Bartoszewicz
Chronic leg ulceration is a disease usually associated with other comorbidities, and significantly reduces patient quality of life. Infected leg ulcers can lead to limb-threatening sequelae or mortality. Leg ulcerations are colonized by a number of microbes that are able to cause life-threating infections in susceptible patients. Wound exudate is a body fluid that collects metabolites from patient eukaryotic cells and from prokaryotic bacterial communities inhabiting the wound. This study aimed at identification of metabolites in exudates collected from chronic leg ulcers, and correlation of this metabolome with patient comorbidities and microbiological status of the wound...
January 10, 2017: Journal of Pharmaceutical and Biomedical Analysis
https://www.readbyqxmd.com/read/28087947/lichenized-fungi-and-the-evolution-of-symbiotic-organization
#2
Martin Grube, Mats Wedin
Lichen symbioses comprise a fascinating relationship between algae and fungi. The lichen symbiotic lifestyle evolved early in the evolution of ascomycetes and is also known from a few basidiomycetes. The ascomycete lineages have diversified in the lichenized stage to give rise to a tremendous variety of morphologies. Their thalli are often internally complex and stratified for optimized integration of algal and fungal metabolisms. Thalli are frequently colonized by specific nonlichenized fungi and occasionally also by other lichens...
December 2016: Microbiology Spectrum
https://www.readbyqxmd.com/read/28087531/salivary-gluten-degradation-and-oral-microbial-profiles-in-health-and-celiac-disease
#3
Na Tian, Lina Faller, Daniel A Leffler, Ciaran P Kelly, Joshua Hansen, Jos A Bosch, Guoxian Wei, Bruce J Paster, Detlef Schuppan, Eva J Helmerhorst
: Celiac disease (CD) is a chronic immune-mediated enteropathy induced by dietary gluten in genetically predisposed individuals. Saliva harbors the second highest bacterial load of the GI tract after the colon. Moreover, saliva contains gluten-degrading enzymes produced by oral bacteria that may modify gluten processing in the intestine and susceptibility to celiac disease (CD). AIM: To investigate salivary enzymatic activities and oral microbial profiles in healthy subjects vs patients with classical and refractory CD...
January 13, 2017: Applied and Environmental Microbiology
https://www.readbyqxmd.com/read/28081446/host-to-host-transmission-of-streptococcus-pneumoniae-is-driven-by-its-inflammatory-toxin-pneumolysin
#4
M Ammar Zafar, Yang Wang, Shigeto Hamaguchi, Jeffrey N Weiser
Host-to-host transmission is a critical step for infection. Here we studied transmission of the opportunistic pathogen Streptococcus pneumoniae in an infant mouse model. Transmission from nasally colonized pups required high levels of bacterial shedding in nasal secretions and was temporally correlated with, and dependent upon, the acute inflammatory response. Pneumolysin, a pore-forming cytotoxin and major virulence determinant, was both necessary and sufficient to promote inflammation, which increased shedding and allowed for intralitter transmission...
January 11, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28081443/the-bacterial-t6ss-effector-evpp-prevents-nlrp3-inflammasome-activation-by-inhibiting-the-ca-2-dependent-mapk-jnk-pathway
#5
Hao Chen, Dahai Yang, Fajun Han, Jinchao Tan, Lingzhi Zhang, Jingfan Xiao, Yuanxing Zhang, Qin Liu
Inflammasome activation is an important innate immune defense mechanism against bacterial infection, and in return, bacteria express virulence determinants that counteract inflammasome activation. Many such effectors are secreted into host cells via specialized bacterial secretion systems. Here, the intracellular pathogenic bacterium Edwardsiella tarda was demonstrated to activate NLRC4 and NLRP3 inflammasomes via a type III secretion system (T3SS), and to inhibit NLRP3 inflammasome via a type VI secretion system (T6SS), indicating the antagonistic roles of these systems in inflammasome signaling...
January 11, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28081441/warfare-between-host-immunity-and-bacterial-weapons
#6
Manda Yu, Erh-Min Lai
Bacterial pathogens deploy protein secretion systems to facilitate infection and colonization of their hosts. In this issue of Cell Host & Microbe, Chen et al. (2017) report a new role for a type VI secretion effector in promoting bacterial colonization by preventing inflammasome activation induced by a type III secretion system.
January 11, 2017: Cell Host & Microbe
https://www.readbyqxmd.com/read/28081189/global-gene-expression-analysis-of-cross-protected-phenotype-of-pectobacterium-atrosepticum
#7
Vladimir Gorshkov, Stanford Kwenda, Olga Petrova, Elena Osipova, Yuri Gogolev, Lucy N Moleleki
The ability to adapt to adverse conditions permits many bacterial species to be virtually ubiquitous and survive in a variety of ecological niches. This ability is of particular importance for many plant pathogenic bacteria that should be able to exist, except for their host plants, in different environments e.g. soil, water, insect-vectors etc. Under some of these conditions, bacteria encounter absence of nutrients and persist, acquiring new properties related to resistance to a variety of stress factors (cross-protection)...
2017: PloS One
https://www.readbyqxmd.com/read/28079883/cysteamine-re-establishes-the-clearance-of-pseudomonas-aeruginosa-by-macrophages-bearing-the-cystic-fibrosis-relevant-f508del-cftr-mutation
#8
Eleonora Ferrari, Romina Monzani, Valeria R Villella, Speranza Esposito, Francesca Saluzzo, Federica Rossin, Manuela D'Eletto, Antonella Tosco, Fabiola De Gregorio, Valentina Izzo, Maria C Maiuri, Guido Kroemer, Valeria Raia, Luigi Maiuri
Cystic fibrosis (CF), the most common lethal monogenic disease in Caucasians, is characterized by recurrent bacterial infections and colonization, mainly by Pseudomonas aeruginosa, resulting in unresolved airway inflammation. CF is caused by mutations in the gene coding for the cystic fibrosis transmembrane conductance regulator (CFTR) protein, which functions as a chloride channel in epithelial cells, macrophages, and other cell types. Impaired bacterial handling by macrophages is a feature of CF airways, although it is still debated how defective CFTR impairs bacterial killing...
January 12, 2017: Cell Death & Disease
https://www.readbyqxmd.com/read/28078797/in-situ-incubation-of-iron-sulfur-mineral-reveals-a-diverse-chemolithoautotrophic-community-and-a-new-biogeochemical-role-for-thiomicrospira
#9
Roman A Barco, Colleen L Hoffman, Gustavo A Ramírez, Brandy M Toner, Katrina J Edwards, Jason B Sylvan
Sulfide mineral precipitation occurs at mid-ocean ridge (MOR) spreading centers, both in the form of plume particles and seafloor massive sulfide structures. A common constituent of MOR is the iron-bearing sulfide mineral pyrrhotite, which was chosen as a substrate for in-situ incubation studies in shallow waters of Catalina Island, CA to investigate the colonization of iron-oxidizing bacteria. Microbial community datasets were obtained from in-situ incubated pyrrhotite, allowing for direct comparison to microbial communities of iron-sulfides from active and inactive chimneys in deep-sea environments...
January 12, 2017: Environmental Microbiology
https://www.readbyqxmd.com/read/28078750/metabolic-adaptation-of-colonic-microbiota-to-galactooligosaccharides-a-proof-of-concept-study
#10
M Mego, C Manichanh, A Accarino, D Campos, M Pozuelo, E Varela, J Vulevic, G Tzortzis, G Gibson, F Guarner, F Azpiroz
BACKGROUND: Prebiotics have been shown to reduce abdominal symptoms in patients with functional gut disorders, despite that they are fermented by colonic bacteria and may induce gas-related symptoms. AIM: To investigate changes in the metabolic activity of gut microbiota induced by a recognised prebiotic. METHODS: Healthy subjects (n = 20) were given a prebiotic (2.8 g/day HOST-G904, HOST Therabiomics, Jersey, Channel Islands) for 3 weeks...
January 12, 2017: Alimentary Pharmacology & Therapeutics
https://www.readbyqxmd.com/read/28078319/gut-microbiota-inflammation-and-colorectal-cancer
#11
Jun Sun, Ikuko Kato
Although genes contribute to colorectal cancer, the gut microbiota are an important player. Accumulating evidence suggests that chronic infection and the ensuing inflammation contributes to tumor initiation and tumor progression. A variety of bacterial species and tumor-promoting virulence mechanisms have been investigated. Significant advances have been made in understanding the composition and functional capabilities of the gut microbiota and its roles in cancer. In the current review, we discuss the novel roles of microbiota in the progression of colon cancer...
June 2016: Genes & Diseases
https://www.readbyqxmd.com/read/28077764/antimicrobial-peptide-coatings-for-hydroxyapatite-electrostatic-and-covalent-attachment-of-antimicrobial-peptides-to-surfaces
#12
Leigh Townsend, Richard L Williams, Olachi Anuforom, Matthew R Berwick, Fenella Halstead, Erik Hughes, Artemis Stamboulis, Beryl Oppenheim, Julie Gough, Liam Grover, Robert A H Scott, Mark Webber, Anna F A Peacock, Antonio Belli, Ann Logan, Felicity de Cogan
The interface between implanted devices and their host tissue is complex and is often optimized for maximal integration and cell adhesion. However, this also gives a surface suitable for bacterial colonization. We have developed a novel method of modifying the surface at the material-tissue interface with an antimicrobial peptide (AMP) coating to allow cell attachment while inhibiting bacterial colonization. The technology reported here is a dual AMP coating. The dual coating consists of AMPs covalently bonded to the hydroxyapatite surface, followed by deposition of electrostatically bound AMPs...
January 2017: Journal of the Royal Society, Interface
https://www.readbyqxmd.com/read/28077143/pregnant-women-carrying-microcephaly-foetuses-and-zika-virus-contain-potentially-pathogenic-microbes-and-parasites-in-their-amniotic-fluid
#13
Diogo Antonio Tschoeke, Louisi Souza de Oliveira, Luciana Leomil, Amilcar Tanuri, Fabiano Lopes Thompson
BACKGROUND: Microcephaly has become a major public health problem in Brazil. The total number of newborns with microcephaly was reported to be >4000 in June 2016. Studies suggest that Zika Virus is a major cause of new microcephaly cases in Brazil. Inside the uterus, the foetus is surrounded by the Amniotic Fluid, a proximal fluid that contains foetal and maternal cells as well as microorganisms and where Zika Virus was already found. CASE PRESENTATION: A previous study reported the presence of the Zika Virus in the amniotic fluid (collected in the 28th gestational week) of two pregnant women carrying microcephaly foetuses in Brazil...
January 11, 2017: BMC Medical Genomics
https://www.readbyqxmd.com/read/28076463/in-vitro-effects-of-melaleuca-alternifolia-essential-oil-on-growth-and-production-of-volatile-sulphur-compounds-by-oral-bacteria
#14
Talita Signoreti Graziano, Caroline Morini Calil, Adilson Sartoratto, Gilson César Nobre Franco, Francisco Carlos Groppo, Karina Cogo-Müller
Objective: Halitosis can be caused by microorganisms that produce volatile sulphur compounds (VSCs), which colonize the surface of the tongue and subgingival sites. Studies have reported that the use of natural products can reduce the bacterial load and, consequently, the development of halitosis. The aim of this study was to evaluate the antimicrobial activity of the essential oil of Melaleuca alternifolia on the growth and volatile sulphur compound (VSC) production of oral bacteria compared with chlorhexidine...
November 2016: Journal of Applied Oral Science: Revista FOB
https://www.readbyqxmd.com/read/28076417/colonization-of-wheat-maize-and-cucumber-by-paenibacillus-polymyxa-wly78
#15
Tianyi Hao, Sanfeng Chen
Paenibacillus polymyxa WLY78 is a nitrogen fixer and it can be potentially applied to biofertilizer in agriculture. In this study, P. polymyxa WLY78 is labelled with gfp gene. The GFP-labelled P. polymyxa WLY78 is used to inoculate wheat, maize and cucumber seedlings grown in the gnotobiotic system and in soil, respectively. Observation by confocal laser scanning microscope reveals that the GFP-labeled bacterial cells are mainly located on the root surface and epidermis of wheat, and only a few cells are present within cortical cells...
2017: PloS One
https://www.readbyqxmd.com/read/28075119/bubble-driven-detachment-of-bacteria-from-confined-microgeometries
#16
Sepideh Khodaparast, Minyoung Kevin Kim, Justin E Silpe, Howard A Stone
Moving air-liquid interfaces, for example, bubbles, play a significant role in the detachment and transport of colloids and microorganisms in confined systems as well as unsaturated porous media. Moreover, they can effectively prevent and/or postpone the development of mature biofilms on surfaces that are colonized by bacteria. Here we demonstrate the dynamics and quantify the effectiveness of this bubble-driven detachment process for the bacterial strain Staphylococcus aureus. We investigate the effects of interface velocity and geometrical factors through microfluidic experiments that mimic some of the confinement features of pore-scale geometries...
January 11, 2017: Environmental Science & Technology
https://www.readbyqxmd.com/read/28075032/-microbiological-findings-and-antibacterial-therapy-in-stevens-johnson-syndrome-toxic-epidermal-necrolysis-patients-from-a-swedish-burn-center
#17
Ilaria Tocco-Tussardi, Fredrik Huss, Benjamin Presman
BACKGROUND: Superimposed infections/sepsis are the major cause of morbidity/mortality in Stevens-Johnson syndrome/Toxic Epidermal Necrolysis (SJS/TEN). It is a delicate balance between avoiding new pharmaceuticals and prophylactically treat an incipient infection. The objective of this study was to investigate the rates and types of infection-microbials and antibiotics involved in SJS/TEN patients. METHODS: Microbiology and clinical data were collected for SJS/TEN patients admitted to our Burn Centre from January 2010 through January 2016...
January 11, 2017: Journal of Cutaneous Pathology
https://www.readbyqxmd.com/read/28074414/spontaneous-remission-of-subcutaneous-scedosporiosis-caused-by-scedosporium-dehoogii-in-a-psoriatic-patient
#18
Fang-Gu Li, Yan-Ping Yang, Wei Li, Ping Sheng, Wen Li, Wen-Ming Huang, Yi-Ming Fan
To date, only one case of post-traumatic endophthalmitis caused by Scedosporium dehoogii has been reported, but its contamination or colonization might not be precluded due to the absence of pathogenic isolation and/or pathological examination. We report the first case to our knowledge of S. dehoogii-induced subcutaneous scedosporiosis in a psoriatic patient. A 58-year-old man with 5-year history of psoriasis vulgaris and immunosuppressant therapy developed pyrexia and multiple subcutaneous abscesses on both knees...
January 10, 2017: Mycopathologia
https://www.readbyqxmd.com/read/28073918/identical-bacterial-populations-colonize-premature-infant-gut-skin-and-oral-microbiomes-and-exhibit-different-in-situ-growth-rates
#19
Matthew R Olm, Christopher T Brown, Brandon Brooks, Brian Firek, Robyn Baker, David Burstein, Karina Soenjoyo, Brian C Thomas, Michael Morowitz, Jillian Banfield
The initial microbiome impacts the health and future development of premature infants. Methodological limitations have led to gaps in our understanding of the habitat range and subpopulation complexity of founding strains, as well as how different body sites support microbial growth. Here, we used metagenomics to reconstruct genomes of strains that colonized the skin, mouth and gut of two hospitalized premature infants during the first month of life. Seven bacterial populations, considered to be identical given whole-genome average nucleotide identity of >99...
January 10, 2017: Genome Research
https://www.readbyqxmd.com/read/28071687/bacterial-load-of-conditioned-pressure-ulcers-is-not-a-predictor-for-early-flap-failure-in-spinal-cord-injury
#20
T Kamradt, S Klein, S Zimmermann, J Schröder-Braunstein, C H Fürstenberg, C Hensel, N Weidner, A Hug
OBJECTIVES: Pressure ulcers impose a major lifetime medical problem to patients with high-grade spinal cord injury (SCI). For patients with stages 3-4 pressure ulcers, plastic surgery is often the only remaining treatment option. Despite considerable flap failure rates of around 30%, only sparse knowledge exists on predictors for flap failure. Hence, identification of predictors for flap failures is needed. METHODS: We prospectively enrolled 38 SCI patients with stages 3-4 pressure ulcers scheduled for plastic surgery...
January 10, 2017: Spinal Cord
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