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https://www.readbyqxmd.com/read/27926940/inflammasome-independent-nlrp3-restriction-of-a-protective-early-neutrophil-response-to-pulmonary-tularemia
#1
Sivakumar Periasamy, Hongnga T Le, Ellen B Duffy, Heather Chin, Jonathan A Harton
Francisella tularensis (Ft) causes a frequently fatal, acute necrotic pneumonia in humans and animals. Following lethal Ft infection in mice, infiltration of the lungs by predominantly immature myeloid cells and subsequent myeloid cell death drive pathogenesis and host mortality. However, following sub-lethal Ft challenge, more mature myeloid cells are elicited and are protective. In addition, inflammasome-dependent IL-1β and IL-18 are important for protection. As Nlrp3 appears dispensable for resistance to infection with Francisella novicida, we considered its role during infection with the virulent Type A strain SchuS4 and the attenuated Type B live vaccine strain LVS...
December 2016: PLoS Pathogens
https://www.readbyqxmd.com/read/27926586/hypercapnic-conditions-after-experimental-blunt-chest-trauma-increase-efferocytosis-of-alveolar-macrophages-and-reduce-local-inflammation
#2
Annette Palmer, Michael S J Eichner, Anne Rittlinger, Daniel H Seitz, Florian Gebhard, Markus S Huber-Lang, Ulrike Niesler
Blunt chest trauma induces severe local and systemic inflammatory alterations and an accumulation of apoptotic polymorphonuclear granulocytes (aPMN) in the lungs, frequently followed by bacterial infection. Alveolar macrophages (AM) represent one of the main actors for their clearance. However, little is known regarding regulatory and influencing factors of AM efferocytic and phagocytic activities. In this context, we investigated the influence of impaired gas exchange on AM activity.Male rats underwent blunt chest trauma or sham procedure and aPMN or E...
December 6, 2016: Shock
https://www.readbyqxmd.com/read/27925791/reemergence-of-lower-airway-microbiota-in-lung-transplant-patients-with-cystic-fibrosis
#3
Saad A Syed, Fiona J Whelan, Barbara Waddell, Harvey R Rabin, Michael D Parkins, Michael G Surette
RATIONALE: Chronic lung infections are a hallmark of cystic fibrosis; they are responsible for progressive airway destruction and ultimately lead to respiratory death or the requirement for life-saving bilateral lung transplant. Furthermore, recurrent isolation of airway pathogens such as Pseudomonas aeruginosa in the allograft after transplant is associated with adverse outcomes, including bronchiolitis obliterans syndrome and acute infections. Little information exists on the impact of bilateral lung transplant on the lower-airway microbiota...
December 2016: Annals of the American Thoracic Society
https://www.readbyqxmd.com/read/27925510/passive-therapy-with-humanized-anti-staphylococcal-enterotoxin-b-antibodies-attenuates-systemic-inflammatory-response-and-protects-from-lethal-pneumonia-caused-by-staphylococcal-enterotoxin-b-producing-staphylococcus-aureus
#4
Melissa J Karau, Mulualem E Tilahun, Ashton Krogman, Barbara A Osborne, Richard A Goldsby, Chella S David, Jayawant N Mandrekar, Robin Patel, Govindarajan Rajagopalan
Drugs such as linezolid that inhibit bacterial protein synthesis may be beneficial in treating infections caused by toxigenic Staphylococcus aureus. As protein synthesis inhibitors have no effect on preformed toxins, neutralization of pathogenic exotoxins with anti-toxin antibodies may be beneficial in conjunction with antibacterial therapy. Herein, we evaluated the efficacy of human-mouse chimeric high-affinity neutralizing anti-staphylococcal enterotoxin B (SEB) antibodies in the treatment of experimental pneumonia caused by SEB-producing S...
December 7, 2016: Virulence
https://www.readbyqxmd.com/read/27925401/dickeya-dadantii-pectic-enzymes-necessary-for-virulence-are-also-responsible-for-activation-of-the-arabidopsis-thaliana-innate-immune-system
#5
Dominique Expert, Oriane Patrit, Vladimir E Shevchik, Claude Perino, Virginie Boucher, Creze Christophe, Estelle Wenes, Mathilde Fagard
Soft-rot diseases of plants attributed to Dickeya dadantii result from lysis of plant cell wall due to pectic enzymes released by the bacterial cell by a type II secretion system (T2SS). A. thaliana can express several lines of defence against this bacterium. We employed bacterial mutants with defective envelope structures or secreted proteins to examine early plant defence reactions. We focused on the production of AtrbohD-dependent ROS, callose deposition and cell death as indicators of these reactions. We observed a significant reduction in ROS and callose formation with a bacterial mutant where genes encoding five pectate lyases (Pels) were disrupted...
December 7, 2016: Molecular Plant Pathology
https://www.readbyqxmd.com/read/27925336/non-exponential-growth-of-mycobacterium-leprae-thai-53-strain-cultured-in-vitro
#6
Kazunobu Amako, Ken-Ichiro Iida, Mitsumasa Saito, Yoshitosi Ogura, Tetsuya Hayashi, Shin-Ichi Yoshida
To determine why cultivation of Mycobacterium leprae in vitro has not been successful, we attempted to culture this bacterium in media supplemented with a variety of biological materials. We observed a slight increase in the number of cells in medium supplemented with human blood plasma and an extract of nude mouse tissue after more than 3 months of cultivation at 30°C. To ascertain whether this increase was real growth, we analyzed the growth by droplet digital PCR. The analysis had the following two results: the slow increase in the copy number of cell-associated DNA and the release of a large amount of DNA into the culture medium from bacterial cells during cultivation...
December 7, 2016: Microbiology and Immunology
https://www.readbyqxmd.com/read/27925153/targeting-the-hard-to-reach-challenges-and-novel-strategies-in-the-treatment-of-intracellular-bacterial-infections
#7
REVIEW
Nor Fadhilah Kamaruzzaman, Sharon Kendall, Liam Good
Infectious diseases continue to threaten human and animal health and welfare globally, impacting millions of lives and causing substantial economic loss. The use of antibacterials has been only partially successful in reducing disease impact. Bacterial cells are inherently resilient, and the therapy challenge is increased by the development of antibacterial resistance, the formation of biofilms and the ability of certain clinically important pathogens to invade and localize within host cells. Invasion into host cells provides protection from both antibacterials and the host immune system...
November 7, 2016: British Journal of Pharmacology
https://www.readbyqxmd.com/read/27924936/genomic-duplication-and-translocation-of-reactivation-transactivator-and-bzip-homolog-genes-is-a-conserved-event-in-alcelaphine-herpesvirus-1
#8
Françoise Myster, Steven J van Beurden, Océane Sorel, Nicolás M Suárez, Alain Vanderplasschen, Andrew J Davison, Benjamin G Dewals
Alcelaphine herpesvirus 1 (AlHV-1) is a gammaherpesvirus carried asymptomatically by wildebeest. Upon cross-species transmission, AlHV-1 induces malignant catarrhal fever (MCF), a fatal lymphoproliferative disease of ruminants, including cattle. The strain C500 has been cloned as an infectious, pathogenic bacterial artificial chromosome (BAC) that is used to study MCF. Although AlHV-1 infection can be established in cell culture, multiple passages in vitro cause a loss of virulence associated with rearrangements of the viral genome...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27924822/il-21-dependent-expansion-of-memory-like-nk-cells-enhances-protective-immune-responses-against-mycobacterium-tuberculosis
#9
S Venkatasubramanian, S Cheekatla, P Paidipally, D Tripathi, E Welch, A R Tvinnereim, R Nurieva, R Vankayalapati
Natural killer (NK) cells are traditionally considered as innate cells, but recent studies suggest that NK cells can distinguish antigens, and that memory NK cells expand and protect against viral pathogens. Limited information is available about the mechanisms involved in memory-like NK cell expansion, and their role in bacterial infections and vaccine-induced protective immune responses. In the current study, using a mouse model of tuberculosis (TB) infection, we found that interferon-gamma producing CD3-NKp46+CD27+KLRG1+ memory-like NK cells develop during Bacille Calmette-Guérin vaccination, expand, and provide protection against challenge with Mycobacterium tuberculosis (M...
December 7, 2016: Mucosal Immunology
https://www.readbyqxmd.com/read/27924676/bacterial-xenophagy-and-its-possible-role-in-cancer-a-potential-antimicrobial-strategy-for-cancer-prevention-and-treatment
#10
Xinbing Sui, Xiao Liang, Liuxi Chen, Chunming Guo, Weidong Han, Hongming Pan, Xue Li
Macroautophagy/autophagy is a conserved catabolic process through which cellular excessive or dysfunctional proteins and organelles are transported to the lysosome for terminal degradation and recycling. Over the past few years increasing evidence has suggested that autophagy is not only a simple metabolite recycling mechanism, but also plays a critical role in the removal of intracellular pathogens such as bacteria and viruses. When autophagy engulfs intracellular pathogens, the pathway is called 'xenophagy' because it leads to the elimination of foreign microbes...
December 7, 2016: Autophagy
https://www.readbyqxmd.com/read/27924081/liver-guardian-modifier-and-target-of-sepsis
#11
REVIEW
Pavel Strnad, Frank Tacke, Alexander Koch, Christian Trautwein
Sepsis and septic shock are characterized by life-threatening organ dysfunction caused by a dysregulated host response to infection. The liver has a central role during sepsis, and is essential to the regulation of immune defence during systemic infections by mechanisms such as bacterial clearance, acute-phase protein or cytokine production and metabolic adaptation to inflammation. However, the liver is also a target for sepsis-related injury, including hypoxic hepatitis due to ischaemia and shock, cholestasis due to altered bile metabolism, hepatocellular injury due to drug toxicity or overwhelming inflammation, as well as distinct pathologies such as secondary sclerosing cholangitis in critically ill patients...
December 7, 2016: Nature Reviews. Gastroenterology & Hepatology
https://www.readbyqxmd.com/read/27923952/differences-in-the-nasopharyngeal-microbiome-during-acute-respiratory-tract-infection-with-human-rhinovirus-and-respiratory-syncytial-virus-in-infancy
#12
Christian Rosas-Salazar, Meghan H Shilts, Andrey Tovchigrechko, Seth Schobel, James D Chappell, Emma K Larkin, Jyoti Shankar, Shibu Yooseph, Karen E Nelson, Rebecca A Halpin, Martin L Moore, Larry J Anderson, R Stokes Peebles, Suman R Das, Tina V Hartert
Respiratory viruses alter the nasopharyngeal microbiome and may be associated with a distinct microbial signature. To test this hypothesis, we compared the nasopharyngeal microbiome of 135 previously healthy infants with acute respiratory infection due to human rhinovirus (HRV; n = 52) or respiratory syncytial virus (RSV; n = 83). The nasopharyngeal microbiome was assessed by sequencing the V4 region of the 16S ribosomal RNA. Respiratory viruses were identified by quantitative reverse-transcription polymerase chain reaction...
December 15, 2016: Journal of Infectious Diseases
https://www.readbyqxmd.com/read/27923904/augmentation-of-cytolytic-activity-in-murine-natural-killer-cells-and-inhibition-of-tumor-growth-by-the-ethanol-fraction-of-oyster-extract
#13
Kaito Sakaguchi, Ming Zhong, Saeko Kawai, Yoshio Shimizu, Eiichi Gohda
A reduced number and/or reduced activity of natural killer (NK) cells, which are important for defense against a variety of cancers and viral infections, occur under various stress conditions and in patients with various diseases. In this article, we report that the 30% to 50% ethanol precipitate of oyster extract (EPOE50) dose-dependently enhanced the activity of mouse spleen NK cells in vitro and in vivo. The activity of EPOE50 was eluted with a molecular weight of about 2000 by gel filtration and was inactivated by periodate but not by proteinase K...
December 5, 2016: Integrative Cancer Therapies
https://www.readbyqxmd.com/read/27923724/strain-specific-impact-of-the-high-pathogenicity-island-on-virulence-in-extra-intestinal-pathogenic-escherichia-coli
#14
Mounira Smati, Giuseppe Magistro, Sandrine Adiba, Andreas Wieser, Bertrand Picard, Sören Schubert, Erick Denamur
In order to clarify the role of the high-pathogenicity island (HPI) in the experimental virulence of Escherichia coli, we constructed different deletion mutants of the entire HPI and of three individual genes (irp2, fyuA and ybtA), encoding for three main functions within the HPI. Those mutants were constructed for three phylogroup B2 strains (536-STc127, CFT073-STc73, and NU14-STc95), representative of the main B2 subgroups causing extra-intestinal infections. Transcriptional profiles obtained for the selected HPI genes irp2, fyuA and ybtA revealed similar patterns for all strains, both under selective iron-deplete conditions and in intracellular bacterial communities in vitro, with a high expression of irp2...
November 22, 2016: International Journal of Medical Microbiology: IJMM
https://www.readbyqxmd.com/read/27923651/a-cheap-simple-high-throughput-method-for-screening-native-helicobacter-pylori-urease-inhibitors-using-a-recombinant-escherichia-coli-its-validation-and-demonstration-of-pistacia-atlantica-methanolic-extract-effectivity-and-specificity
#15
Natalie Amar, Avi Peretz, Yoram Gerchman
Helicobacter pylori is the most frequent and persistent bacterial infection worldwide, and a risk factor for active gastritis, peptic ulcers, mucosa-associated lymphoid tissue lymphoma, and gastric cancer. Although combined antibiotics treatment is effective cases of antibiotic resistance are reported at an alarming rate. The H. pylori urease enzyme is essential for the bacteria establishment in the gastric mucosa, resulting urease inhibitors being sought after as effective and specific anti- H. pylori treatment...
December 3, 2016: Journal of Microbiological Methods
https://www.readbyqxmd.com/read/27923372/community-acquired-meningitis-caused-by-a-cg86-hypervirulent-klebsiella-pneumoniae-strain-first-case-report-in-the-caribbean
#16
Bénédicte Melot, Sylvain Brisse, Sébastien Breurec, Virginie Passet, Edith Malpote, Isabelle Lamaury, Guillaume Thiery, Bruno Hoen
BACKGROUND: Community-acquired bacterial meningitis due to Klebsiella pneumoniae has mainly been described in Southeast Asia and has a poor prognosis. Severe invasive infections caused by K. pneumoniae, including meningitis, are often due to hypervirulent strains (hvKP), which are characterized by capsular serotypes K1 and K2, a gene responsible for hypermucoviscosity, and the cluster for synthesis of the siderophore aerobactin. CASE PRESENTATION: A 55 year old man with a history of essential hypertension, benign prostate hyperplasia, hyperlipidemia, obstructive sleep apnea, and chronic alcoholism was admitted for meningitis due to Klebsiella pneumoniae with a wild-type susceptibility profile...
December 7, 2016: BMC Infectious Diseases
https://www.readbyqxmd.com/read/27923358/acthaside-a-new-chromone-derivative-from-acacia-ataxacantha-and-its-biological-activities
#17
Abdou Madjid O Amoussa, Mélanie Bourjot, Latifou Lagnika, Catherine Vonthron-Sénécheau, Ambaliou Sanni
BACKGROUND: Acacia ataxacantha (Fabaceae), used in traditional medicine grows in the South-West of Bénin. Ethyl acetate extract of the barks of this species was previously reported to display various bioactivities, including antibacterial, antifungal and antioxidant activities. In the present study, we investigate the antimicrobial and antioxidant activities of compound isolated from ethyl acetate extract of Acacia ataxacantha. METHODS: Purification, isolation and structural identification of isolated compound were done using various chromatographic and spectroscopic methods...
December 7, 2016: BMC Complementary and Alternative Medicine
https://www.readbyqxmd.com/read/27922956/the-complicated-facial-war-injury-pitfalls-and-mismanagement
#18
Ghassan S Abu-Sittah, Joe Baroud, Christopher Hakim, Cynthia Wakil
OBJECTIVE: The aim of this paper is to share the authors' experience in the management of complicated facial war injuries using free tissue transfer. A discussion on the most commonly encountered pitfalls in management during the acute and complicated settings is presented in an effort to raise insight on facial war wound complications. METHODOLOGY: Two patients of complicated facial war injuries are presented to exemplify the pitfalls in acute and chronic management of the mandibular region in the first patient and the orbito-maxillary region in the second...
December 5, 2016: Journal of Craniofacial Surgery
https://www.readbyqxmd.com/read/27922894/antimicrobial-prophylaxis-practice-patterns-in-breast-augmentation-a-national-survey-of-current-practice
#19
Karan Chopra, Arvind U Gowda, Colton H L McNichols, Emile N Brown, Sheri Slezak, Yvonne Rasko
BACKGROUND: Breast augmentation is one of the most commonly performed aesthetic surgery procedures worldwide. Bacterial contamination is of paramount concern due to its role in biofilm formation and capsular contracture. Plastic surgeons have adopted a variety of perioperative interventions in efforts to reduce implant contamination, however definitive evidence supporting these practices is lacking. OBJECTIVE: The goal of this study was to assess current practice patterns aimed at reducing implant-related infections in breast augmentation and comparing them to current evidence-based medicine recommendations...
December 5, 2016: Annals of Plastic Surgery
https://www.readbyqxmd.com/read/27922858/hiv-hpv-and-microbiota-partners-in-crime
#20
Sergio Serrano-Villar, Emilia Vásquez-Domínguez, José Antonio Pérez-Molina, Talía Sainz, Amparo de Benito, Amparo Latorre, Andrés Moya, María José Gosalbes, Santiago Moreno
Altered interplay between gut mucosa and dysbiotic bacteria during HIV infection seems to fuel chronic immune dysfunction and might explain the excess rates of HPV-associated anal cancer in HIV-infected individuals. Here, we show in HIV-infected MSM undergoing screening for HPV-related cancer that specific fecal and mucosal bacteria are able to predict the existence of precancerous anal lesions. If confirmed, these bacterial biomarkers could be exploited either as diagnostic tools or therapeutic targets.
December 5, 2016: AIDS
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