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https://www.readbyqxmd.com/read/27911410/experimental-infection-with-listeria-monocytogenes-as-a-model-for-studying-host-interferon-%C3%AE-responses
#1
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/27911388/high-throughput-real-time-dual-readout-testing-of-intracellular-antimicrobial-activity-and-eukaryotic-cell-cytotoxicity
#2
Lucius Chiaraviglio, Yoon-Suk Kang, James E Kirby
Traditional measures of intracellular antimicrobial activity and eukaryotic cell cytotoxicity rely on endpoint assays. Such endpoint assays require several additional experimental steps prior to readout, such as cell lysis, colony forming unit determination, or reagent addition. When performing thousands of assays, for example, during high-throughput screening, the downstream effort required for these types of assays is considerable. Therefore, to facilitate high-throughput antimicrobial discovery, we developed a real-time assay to simultaneously identify inhibitors of intracellular bacterial growth and assess eukaryotic cell cytotoxicity...
November 16, 2016: Journal of Visualized Experiments: JoVE
https://www.readbyqxmd.com/read/27911143/factors-predicting-life-threatening-infections-with-respiratory-syncytial-virus-in-adult-patients
#3
Se Yoon Park, Taeeun Kim, Young Rock Jang, Min-Chul Kim, Yong Pil Chong, Sang-Oh Lee, Sang-Ho Choi, Yang Soo Kim, Jun Hee Woo, Sung-Han Kim
BACKGROUND: Respiratory syncytial virus (RSV) is a significant cause of acute respiratory illness with a clinical spectrum ranging from self-limiting upper respiratory infection to severe lower respiratory infection in elderly persons as well as young children. However, there are limited data on risk factors for life-threatening infections that could guide the appropriate use of antiviral agents in adult patients with RSV. METHODS: We conducted a retrospective cohort study from October 2013 to September 2015...
December 2, 2016: Infectious Diseases
https://www.readbyqxmd.com/read/27910930/design-of-a-hydroxyapatite-binding-antimicrobial-peptide-with-improved-retention-and-antibacterial-efficacy-for-oral-pathogen-control
#4
Zhi-Bin Huang, Xin Shi, Jing Mao, Shi-Qiang Gong
Controlling and reducing the formation of pathogenic biofilm on tooth surface is the key to the prevention and treatment of the biofilm-associated oral diseases. Antimicrobial peptides (AMPs), considered as possible future alternatives for conventional antibiotics, have been extensively studied for the control of bacterial infection. Due to the rapid dilution and degradation by human saliva, AMP preparations designed for oral use with longer retention and higher efficacy are in urgent need. To this end, a hydroxyapatite (HAp)-binding antimicrobial peptide (HBAMP), which is based on the fusion of a specific HAp-binding heptapeptide (HBP7) domain and a broad-spectrum antimicrobial peptide (KSLW) domain, has been developed in our laboratory...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910884/the-hha-tomb-toxin-antitoxin-system-shows-conditional-toxicity-and-promotes-persister-cell-formation-by-inhibiting-apoptosis-like-death-in-s-typhimurium
#5
Sangeeta Jaiswal, Prajita Paul, Chandrashekhar Padhi, Shilpa Ray, Daniel Ryan, Shantoshini Dash, Mrutyunjay Suar
Toxin-antitoxin (TA) modules are two component "addictive" genetic elements found on either plasmid or bacterial chromosome, sometimes on both. TA systems perform a wide range of functions like biofilm formation, persistence, programmed cell death, phage abortive infection etc. Salmonella has been reported to contain several such TA systems. However, the hemolysin expression modulating protein (Hha) and its adjacent uncharacterized hypothetical protein TomB (previously known as YbaJ), have not been listed as a TA module in Salmonella...
December 2, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27910828/biofilm-prevention-of-gram-negative-bacterial-pathogens-involved-in-periprosthetic-infection-by-antibiotic-loaded-calcium-sulfate-beads-in-vitro
#6
Robert P Howlin, Christopher Winnard, Connor J Frapwell, Jeremy S Webb, John J Cooper, Sean S Aiken, Paul Stoodley
Biofilm formation represents a key stage in the pathogenesis of prosthetic infections (PIs). More tolerant to antibiotics than their planktonic counterparts, biofilm bacteria are difficult to eradicate using conventional therapeutic regimes. A common approach in PI management is the adjunctive use of localised antibiotics in addition to systemic administration in an attempt to protect the implant from colonisation by infiltrating bacteria. This study evaluates the antibacterial and antibiofilm efficacy of antibiotic-loaded dissolvable calcium sulphate, previously shown to be effective against key gram-positive pathogens, against gram-negative species important in the establishment of chronic infection in PIs...
December 2, 2016: Biomedical Materials
https://www.readbyqxmd.com/read/27910210/microbiological-evaluation-of-the-extension-wire-and-percutaneous-epidural-lead-anchor-site-following-a-2-stage-cut-down-spinal-cord-stimulator-procedure
#7
Abdul Ghaaliq Lalkhen, Mahindra Chincholkar, Jiten Patel
OBJECTIVES: There are concerns regarding bacterial colonization of the temporary extension leads and subsequent infection risk using the 2-stage cut-down approach in spinal cord stimulation (SCS). We sought to quantify the extent of bacterial colonization of the temporary extension wire and percutaneous epidural lead anchor site. MATERIALS AND METHODS: We conducted a cross-sectional observational study recruiting a pragmatic sample of 25 consecutive patients listed for a cut-down trial of SCS...
December 2, 2016: Pain Practice: the Official Journal of World Institute of Pain
https://www.readbyqxmd.com/read/27909688/the-danger-signal-extracellular-atp-is-an-inducer-of-fusobacterium-nucleatum-biofilm-dispersal
#8
Qinfeng Ding, Kai Soo Tan
Plaque biofilm is the primary etiological agent of periodontal disease. Biofilm formation progresses through multiple developmental stages beginning with bacterial attachment to a surface, followed by development of microcolonies and finally detachment and dispersal from a mature biofilm as free planktonic bacteria. Tissue damage arising from inflammatory response to biofilm is one of the hallmark features of periodontal disease. A consequence of tissue damage is the release of ATP from within the cell into the extracellular space...
2016: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/27909580/burden-of-neisseria-meningitidis-infections-in-china-a-systematic-review-and-meta-analysis
#9
Yaowen Zhang, Dong Wei, Xinzhen Guo, Mai Han, Lichao Yuan, Moe H Kyaw
BACKGROUND: Neisseria meningitidis is a leading cause of bacterial meningitis and septicemia in children and young adults worldwide. The disease burden associated with N. meningitidis infections has not been systematically assessed in China. Therefore, we undertook this study to determine the burden of meningococcal disease in China. METHOD: We performed a systematic review and meta-analysis of articles on N. meningitidis incidence, carriage, seroprevalence and mortality rates in China by searching the Chinese BioMedical Database (CBM), China National Knowledge Infrastructure (CNKI), Wanfang database and PubMed for publications from January 2005 to Aug 2015...
December 2016: Journal of Global Health
https://www.readbyqxmd.com/read/27909274/-three-mitral-valve-operations-in-a-patient-with-trousseau-syndrome-and-nonbacterial-thrombotic-endocarditis-caused-by-ovarian-cancer
#10
Masahito Saito, Naoki Asano, Kazunori Ota, Kazuho Niimi, Koyu Tanaka, Shigeyoshi Gon, Hiroshi Takano
A 52-year-old woman was admitted to our hospital for acute right hemi-paresis, left homonymous hemianopia, and fever. Magnetic resonance imaging of the brain showed multiple cerebral infarctions and transesophageal echocardiography (TEE) revealed a vegetation on the posterior leaflet of her mitral valve. Mitral valve repair was performed under a diagnosis of infective endocarditis (IE). Further multiple cerebral infarctions occurred on the 11th postoperative day, resulting in left hemiplegia and dysarthria...
December 2016: Kyobu Geka. the Japanese Journal of Thoracic Surgery
https://www.readbyqxmd.com/read/27908758/thermally-triggered-release-of-the-bacteriophage-endolysin-chapk-and-the-bacteriocin-lysostaphin-for-the-control-of-methicillin-resistant-staphylococcus-aureus-mrsa
#11
Hollie Hathaway, Jude Ajuebor, Liam Stephens, Aidan Coffey, Ursula Potter, J Mark Sutton, A Toby A Jenkins
Staphylococcus aureus infections of the skin and soft tissue pose a major concern to public health, largely owing to the steadily increasing prevalence of drug resistant isolates. As an alternative mode of treatment both bacteriophage endolysins and bacteriocins have been shown to possess antimicrobial efficacy against multiple species of bacteria including otherwise drug resistant strains. Despite this, the administration and exposure of such antimicrobials should be restricted until required in order to discourage the continued evolution of bacterial resistance, whilst maintaining the activity and stability of such proteinaceous structures...
November 28, 2016: Journal of Controlled Release: Official Journal of the Controlled Release Society
https://www.readbyqxmd.com/read/27908581/sonodynamic-inactivation-of-gram-positive-and-gram-negative-bacteria-using-a-rose-bengal-antimicrobial-peptide-conjugate
#12
David Costley, Heather Nesbitt, Nigel Ternan, James Dooley, Ying-Ying Huang, Michael R Hamblin, Anthony P McHale, John F Callan
Combating antimicrobial resistance is one of the most serious public health challenges facing society today. The development of new antibiotics or alternative techniques that can help combat antimicrobial resistance is being prioritised by many governments and stakeholders across the globe. Antimicrobial photodynamic therapy is one such technique that has received considerable attention but is limited by the inability of light to penetrate through human tissue, reducing its effectiveness when used to treat deep-seated infections...
November 17, 2016: International Journal of Antimicrobial Agents
https://www.readbyqxmd.com/read/27908274/a-novel-approach-to-probe-host-pathogen-interactions-of-bovine-digital-dermatitis-a-model-of-a-complex-polymicrobial-infection
#13
Paolo Marcatili, Martin W Nielsen, Thomas Sicheritz-Pontén, Tim K Jensen, Claus Schafer-Nielsen, Mette Boye, Morten Nielsen, Kirstine Klitgaard
BACKGROUND: Polymicrobial infections represent a great challenge for the clarification of disease etiology and the development of comprehensive diagnostic or therapeutic tools, particularly for fastidious and difficult-to-cultivate bacteria. Using bovine digital dermatitis (DD) as a disease model, we introduce a novel strategy to study the pathogenesis of complex infections. RESULTS: The strategy combines meta-transcriptomics with high-density peptide-microarray technology to screen for in vivo-expressed microbial genes and the host antibody response at the site of infection...
December 1, 2016: BMC Genomics
https://www.readbyqxmd.com/read/27907974/-salmonellosis-a-real-threat-for-infants
#14
Václav Musil, Lenka Krbková, Peter Mikolášek, Lukáš Homola, Adriana Braunová
Salmonella spp. are a common cause of bacterial gastroenteritis. In infants, Salmonella infection is uncommon, posing a higher risk for a severe course. The authors present a case of a 3-month-old infant with suspected Salmonella sepsis. Also discussed are the correct approach to therapy and potential errors in the treatment of the youngest age groups.
September 2016: Klinická Mikrobiologie a Infekc̆ní Lékar̆ství
https://www.readbyqxmd.com/read/27907971/-interpretation-of-bacterial-susceptibility-resistance-to-antibiotics
#15
Milan Kolář
Bacterial resistance may be defined from a microbiological, clinical and pharmacological perspective. Microbiological resistance refers to the presence of genetic information coding for the relevant mechanism of resistance of a bacterium to a particular antibiotic. In case of clinical interpretation, breakpoints are of key importance as their role is to distinguish bacterial pathogens in which successful therapy is highly probable from isolates with a high likelihood of failure. However, it is questionable whether this approach is suitable for all patients, particularly those receiving intensive care for life-threatening infections...
September 2016: Klinická Mikrobiologie a Infekc̆ní Lékar̆ství
https://www.readbyqxmd.com/read/27907841/bacterial-e3-ligase-effectors-exploit-host-ubiquitin-systems
#16
REVIEW
Hiroshi Ashida, Chihiro Sasakawa
Ubiquitination is a crucial post-translational protein modification involved in regulation of various cellular processes in eukaryotes. In particular, ubiquitination is involved in multiple aspects of bacterial infection and host defense mechanisms. In parallel with the identification of ubiquitination as a component of host defense systems, recently accumulated evidence shows that many bacterial pathogens exploit host ubiquitin systems to achieve successful infection. Here, we highlight the strategies by which bacteria subvert host ubiquitin systems by mimicking E3 ubiquitin ligase activity...
November 28, 2016: Current Opinion in Microbiology
https://www.readbyqxmd.com/read/27907156/increased-nasopharyngeal-density-and-concurrent-carriage-of-streptococcus-pneumoniae-haemophilus-influenzae-and-moraxella-catarrhalis-are-associated-with-pneumonia-in-febrile-children
#17
Sopio Chochua, Valérie D'Acremont, Christiane Hanke, David Alfa, Joshua Shak, Mary Kilowoko, Esther Kyungu, Laurent Kaiser, Blaise Genton, Keith P Klugman, Jorge E Vidal
BACKGROUND: We assessed nasopharyngeal (NP) carriage of five pathogens in febrile children with and without acute respiratory infection (ARI) of the upper (URTI) or lower tract, attending health facilities in Tanzania. METHODS: NP swabs collected from children (N = 960) aged 2 months to 10 years, and with a temperature ≥38°C, were utilized to quantify bacterial density of S. pneumoniae (Sp), H. influenzae (Hi), M. catarrhalis (Mc), S. aureus (Sa), and N. meningitidis (Nm)...
2016: PloS One
https://www.readbyqxmd.com/read/27907136/immune-activation-and-bacterial-translocation-a-link-between-impaired-immune-recovery-and-frequent-visceral-leishmaniasis-relapses-in-hiv-infected-patients
#18
Maria Luciana Silva-Freitas, Glaucia Fernandes Cota, Talia S Machado-de-Assis, Carmem Giacoia-Gripp, Ana Rabello, Alda M Da-Cruz, Joanna R Santos-Oliveira
The maintenance of chronic immune activation due to leishmaniasis or even due to microbial translocation is associated with immunosenescence and may contribute to frequent relapses. Our aim was to investigate whether patients with HIV-associated visceral leishmaniasis (VL/HIV) who experience a single episode of VL have different immunological behaviors in comparison to those who experience frequent relapses. VL/HIV patients were allocated to non-relapsing (NR, n = 6) and relapsing (R, n = 11) groups and were followed from the active phase of VL up to 12 months post-treatment (mpt)...
2016: PloS One
https://www.readbyqxmd.com/read/27907047/rage-deficiency-impairs-bacterial-clearance-in-murine-staphylococcal-sepsis-but-has-no-significant-impact-on-staphylococcal-septic-arthritis
#19
Majd Mohammad, Manli Na, Amanda Welin, Mattias N D Svensson, Abukar Ali, Tao Jin, Rille Pullerits
BACKGROUND: Septic arthritis is a serious joint disease often caused by Staphylococcus aureus (S. aureus). Receptor for Advanced Glycation End products (RAGE) has an important role in several infections. We sought to investigate the role of RAGE in staphylococcal septic arthritis and sepsis in mice. METHODS: Wild-type (WT) and RAGE deficient (RAGE-/-) mice were intra-articularly or intravenously inoculated with an arthritic or septic dose of S. aureus LS-1 strain...
2016: PloS One
https://www.readbyqxmd.com/read/27906027/antiretroviral-treatment-regardless-of-cd4-count-the-universal-answer-to-a-contextual-question
#20
REVIEW
Serge P Eholié, Anani Badje, Gérard M Kouame, Jean-Baptiste N'takpe, Raoul Moh, Christine Danel, Xavier Anglaret
After a period where it was recommended to start antiretroviral therapy (ART) early, the CD4 threshold for treating asymptomatic adults dropped to 200/mm(3) at the beginning of the 2000s. This was mostly due to a great prudence with regards to drug toxicity. The ART-start CD4 threshold in most international guidelines was then raised to 350/mm(3) in 2006-2009 and to 500/mm(3) in 2009-2013. Between 2012 and 2015, international guidelines went the last step further and recommended treating all HIV-infected adults regardless of their CD4 count...
July 26, 2016: AIDS Research and Therapy
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