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https://www.readbyqxmd.com/read/28343241/in-vitro-activity-of-alpha-mangostin-in-killing-and-eradicating-staphylococcus-epidermidis-rp62a-biofilms
#1
Murugesan Sivaranjani, Manivannan Prakash, Shanmugaraj Gowrishankar, Janarthanam Rathna, Shunmugiah Karutha Pandian, Arumugam Veera Ravi
Alpha-mangostin (α-MG) has been reported to be an effective antibacterial agent against planktonic cells of many Gram-positive bacteria. However, the antibiofilm potency of α-MG remains unexplored till date. In this study, the antibiofilm and mature biofilm eradication ability of α-MG against Staphylococcus epidermidis RP62A (ATCC 35984) biofilms were evaluated. The minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of α-MG against S. epidermidis RP62A were found to be 1...
March 25, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28340348/the-evolutionary-pathway-to-virulence-of-an-rna-virus
#2
Adi Stern, Ming Te Yeh, Tal Zinger, Matt Smith, Caroline Wright, Guy Ling, Rasmus Nielsen, Andrew Macadam, Raul Andino
Paralytic polio once afflicted almost half a million children each year. The attenuated oral polio vaccine (OPV) has enabled world-wide vaccination efforts, which resulted in nearly complete control of the disease. However, poliovirus eradication is hampered globally by epidemics of vaccine-derived polio. Here, we describe a combined theoretical and experimental strategy that describes the molecular events leading from OPV to virulent strains. We discover that similar evolutionary events occur in most epidemics...
March 23, 2017: Cell
https://www.readbyqxmd.com/read/28340198/reasons-to-wait-or-to-treat-naive-patients-affected-by-chronic-hepatitis-c-with-low-fibrosis-stage-and-genotypes-2-or-3
#3
Lucio Boglione, Jessica Cusato, Giuseppe Cariti, Giovanni Di Perri, Antonio D'Avolio
New interferon (IFN)-free therapies are not currently available for all patients with chronic hepatitis C due to higher costs; in Italy, patients with genotype 2 (GT2) or GT3 without severe fibrosis can choose between wait or treatment with pegylated (PEG)-IFN and ribavirin. This study wants to examine the real rate of patients that accept or refused this therapy and the reasons related to decision. This prospective, observational analysis was performed at our centre between January 2014 and June 2015. Epidemiological, social and clinical data were collected in medical records; reasons for treatment acceptance/refusal were recorded through a questionnaire...
March 10, 2017: European Journal of Public Health
https://www.readbyqxmd.com/read/28339783/a-stochastic-model-for-tumour-control-probability-that-accounts-for-repair-from-sublethal-damage
#4
Ana Victoria Ponce Bobadilla, Philip K Maini, Helen Byrne
The tumour control probability (TCP) is the probability that a treatment regimen of radiation therapy (RT) eradicates all tumour cells in a given tissue. To decrease the toxic effects on healthy cells, RT is usually delivered over a period of weeks in a series of fractions. This allows tumour cells to repair sublethal damage (RSD) caused by radiation. In this article, we introduce a stochastic model for tumour response to radiotherapy which accounts for the effects of RSD. The tumour is subdivided into two cell types: 'affected' cells which have been damaged by RT and 'unaffected' cells which have not...
February 26, 2017: Mathematical Medicine and Biology: a Journal of the IMA
https://www.readbyqxmd.com/read/28339458/rapid-surveillance-for-vector-presence-rsvp-development-of-a-novel-system-for-detecting-aedes-aegypti-and-aedes-albopictus
#5
Brian L Montgomery, Martin A Shivas, Sonja Hall-Mendelin, Jim Edwards, Nicholas A Hamilton, Cassie C Jansen, Jamie L McMahon, David Warrilow, Andrew F van den Hurk
BACKGROUND: The globally important Zika, dengue and chikungunya viruses are primarily transmitted by the invasive mosquitoes, Aedes aegypti and Aedes albopictus. In Australia, there is an increasing risk that these species may invade highly urbanized regions and trigger outbreaks. We describe the development of a Rapid Surveillance for Vector Presence (RSVP) system to expedite presence- absence surveys for both species. METHODOLOGY/PRINCIPAL FINDINGS: We developed a methodology that uses molecular assays to efficiently screen pooled ovitrap (egg trap) samples for traces of target species ribosomal RNA...
March 24, 2017: PLoS Neglected Tropical Diseases
https://www.readbyqxmd.com/read/28338468/endoscopic-mucosal-resection-for-high-grade-dysplasia-and-intramucosal-carcinoma-a-canadian-experience
#6
Denise Tami Yamashita, Chao Li, Drew Bethune, Harry Henteleff, James Ellsmere
BACKGROUND: Endoscopic mucosal resection (EMR) is increasingly being used as a first-line treatment for Barrett esophagus (BE) with high-grade dysplasia (HGD) and intramucosal adenocarcinoma (IMC). We reviewed our experience with endoscopic treatment of BE with HGD and IMC at our institution with respect to eradication rates, complications and long-term recurrence. METHODS: We performed a single-centre retrospective review of all patients referred between October 2010 and August 2014 for EMR with dysplastic BE or IMC...
April 2017: Canadian Journal of Surgery. Journal Canadien de Chirurgie
https://www.readbyqxmd.com/read/28338360/resuscitation-promoting-factors-are-important-determinants-of-the-pathophysiology-in-mycobacterium-tuberculosis-infection
#7
Andrew Rosser, Cordula Stover, Manish Pareek, Galina V Mukamolova
Resuscitation promoting factors (Rpf) are peptidoglycan-hydrolyzing enzymes that are pivotal in the resuscitation of quiescent actinobacteria including Mycobacterium tuberculosis. From the published data, it is clear that Rpf are required for the resuscitation of non-replicating bacilli and pathogenesis in murine infection model of tuberculosis, although their direct influence on human Mycobacterium tuberculosis infection is ill-defined. In this review, we describe the progress in the understanding of the roles that Rpf play in human tuberculosis pathogenesis and importance of bacilli dependent upon Rpf for growth for the outcome of human tuberculosis...
February 17, 2017: Critical Reviews in Microbiology
https://www.readbyqxmd.com/read/28337902/helicobacter-pylori-in-periodontal-pockets-and-saliva-a-possible-role-in-gastric-infection-relapses
#8
L Azzi, F Carinci, S Gabaglio, F Cura, F Croveri, L Tettamanti, A Tagliabue, S Segato
It has been a long time since the scientific community started to speculate upon the presence of Helicobacter pylori (HP) in periodontal pockets as an extra-gastric reservoir responsible for gastric relapses after eradication therapy. The aim of this study is to evaluate the presence of oral HP in a group of patients who underwent examination for gastric infection. Sixty patients were enrolled in the current study, subdivided into two groups: 30 patients with a positive result for HP gastric infection with C-Breath Test Urea examination, and 30 patients with a negative result for HP gastric infection...
January 2017: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/28337488/supercritical-carbon-dioxide-based-sterilization-of-decellularized-heart-valves
#9
Ryan S Hennessy, Soumen Jana, Brandon J Tefft, Meghana R Helder, Melissa D Young, Rebecca R Hennessy, Nicholas J Stoyles, Amir Lerman
OBJECTIVE: The goal of this research project encompasses finding the most efficient and effective method of decellularized tissue sterilization. BACKGROUND: Aortic tissue grafts have been utilized to repair damaged or diseased valves. Although, the tissues for grafting are collected aseptically, it does not eradicate the risk of contamination nor disease transfer. Thus, sterilization of grafts is mandatory. Several techniques have been applied to sterilize grafts; however, each technique shows drawbacks...
February 2017: JACC. Basic to Translational Science
https://www.readbyqxmd.com/read/28337440/rabies-control-could-innovative-financing-break-the-deadlock
#10
REVIEW
Susan C Welburn, Paul G Coleman, Jakob Zinsstag
The neglected zoonotic diseases (NZDs) have been all but eradicated in wealthier countries but remain major causes of ill-health and mortality in over 80 countries across Africa, Asia, and Latin America. The nature of neglect for the NZDs has been ascribed, in part, to underreporting resulting in an underestimation of their global burden that, together with a lack of advocacy, downgrades their relevance to policy-makers and funding agencies. While this may be the case for many NZDs, for rabies this is not the case...
2017: Frontiers in Veterinary Science
https://www.readbyqxmd.com/read/28337370/role-of-epidermal-growth-factor-receptor-in-lung-cancer-and-targeted-therapies
#11
REVIEW
Tie-Cheng Liu, Xin Jin, Yan Wang, Ke Wang
Lung cancer is the foremost cause of cancer-related deaths world-wide. Both, the major forms of lung cancer, Non-small cell lung cancer (NSCLC) and Small cell lung cancers (SCLC), have responded effectively to chemo-, radiation and adjuvant-therapies. Tumor removal through surgery also appeared as a good therapeutic strategy. However, these therapies demonstrated unfavourable side-effects, and hence novel drugs targeting lung cancer emerged essential. Activation of epidermal growth factor receptor (EGFR)-tyrosine kinases is a key reason for lung cancer progression...
2017: American Journal of Cancer Research
https://www.readbyqxmd.com/read/28337217/cost-effectiveness-analysis-of-helicobacter-pylori-diagnostic-methods-in-patients-with-atrophic-gastritis
#12
Fumio Omata, Takuro Shimbo, Sachiko Ohde, Gautam A Deshpande, Tsuguya Fukui
Background. There are several diagnostic methods for Helicobacter pylori (H. pylori) infection. A cost-effective analysis is needed to decide on the optimal diagnostic method. The aim of this study was to determine a cost-effective diagnostic method in patients with atrophic gastritis (AG). Methods. A decision-analysis model including seven diagnostic methods was constructed for patients with AG diagnosed by esophagogastroduodenoscopy. Expected values of cost and effectiveness were calculated for each test...
2017: Gastroenterology Research and Practice
https://www.readbyqxmd.com/read/28337195/nk-cells-uncertain-allies-against-malaria
#13
REVIEW
Asia-Sophia Wolf, Samuel Sherratt, Eleanor M Riley
Until recently, studies of natural killer (NK) cells in infection have focused almost entirely on their role in viral infections. However, there is an increasing awareness of the potential for NK cells to contribute to the control of a wider range of pathogens, including intracellular parasites such as Plasmodium spp. Given the high prevalence of parasitic diseases in the developing world and the devastating effects these pathogens have on large numbers of vulnerable people, investigating interactions between NK cells and parasitized host cells presents the opportunity to reveal novel immunological mechanisms with the potential to aid efforts to eradicate these diseases...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28336905/a-nanostructured-matrices-assessment-to-study-drug-distribution-in-solid-tumor-tissues-by-mass-spectrometry-imaging
#14
Silvia Giordano, Valentina Pifferi, Lavinia Morosi, Melinda Morelli, Luigi Falciola, Giuseppe Cappelletti, Sonja Visentin, Simonetta A Licandro, Roberta Frapolli, Massimo Zucchetti, Roberta Pastorelli, Laura Brunelli, Maurizio D'Incalci, Enrico Davoli
The imaging of drugs inside tissues is pivotal in oncology to assess whether a drug reaches all cells in an adequate enough concentration to eradicate the tumor. Matrix-Assisted Laser Desorption Ionization Mass Spectrometry Imaging (MALDI-MSI) is one of the most promising imaging techniques that enables the simultaneous visualization of multiple compounds inside tissues. The choice of a suitable matrix constitutes a critical aspect during the development of a MALDI-MSI protocol since the matrix ionization efficiency changes depending on the analyte structure and its physico-chemical properties...
March 21, 2017: Nanomaterials
https://www.readbyqxmd.com/read/28336455/targeted-delivery-of-epirubicin-to-tumor-associated-macrophages-by-sialic-acid-cholesterol-conjugate-modified-liposomes-with-improved-antitumor-activity
#15
Songlei Zhou, Ting Zhang, Bo Peng, Xiang Luo, Xinrong Liu, Ling Hu, Yang Liu, Donghua Di, Yanzhi Song, Yihui Deng
With the knowledge that the receptors of sialic acid are overexpressed on the surface of tumor-associated macrophages (TAMs), which play a crucial role in the tumor's progression and metastasis, a sialic acid-cholesterol conjugate (SA-CH) was synthesized and modified on the surface of epirubicin (EPI)-loaded liposomes (EPI-SAL) to improve the delivery of EPI to the TAMs. The liposomes were developed using remote loading technology via a pH gradient. The liposomes were evaluated for particle size, encapsulation efficiency, in vitro release, stability, in vitro cytotoxicity and pharmacokinetics...
March 20, 2017: International Journal of Pharmaceutics
https://www.readbyqxmd.com/read/28336411/exogenous-hydrogen-sulfide-eliminates-spatial-memory-retrieval-impairment-and-hippocampal-ca1-ltd-enhancement-caused-by-acute-stress-via-promoting-glutamate-uptake
#16
Jin He, Ruixian Guo, Pengxin Qiu, Xingwen Su, Guangmei Yan, Jianqiang Feng
Acute stress impairs the hippocampus-dependent spatial memory retrieval, and its synaptic mechanisms are associated with hippocampal CA1 long-term depression (LTD) enhancement in the adult rats. Endogenous hydrogen sulfide (H2S) is recognized as a novel gasotransmitter and has the neural protective roles. However, very little attention has been paid to understanding the effects of H2S on spatial memory retrieval impairment. We observed the protective effects of NaHS (a donor of H2S) against spatial memory retrieval impairment caused by acute stress and its synaptic mechanisms...
March 20, 2017: Neuroscience
https://www.readbyqxmd.com/read/28336275/structural-characterization-of-purine-nucleoside-phosphorylase-from-human-pathogen-helicobacter-pylori
#17
Zoran Štefanić, Goran Mikleušević, Marija Luić, Agnieszka Bzowska, Ivana Leščić Ašler
Microaerophilic bacterium Helicobacer pylori is a well known human pathogen involved in the development of many diseases. Due to the evergrowing infection rate and increase of H. pylori antibiotic resistence, it is of utmost importance to find a new way to attack and eradicate H. pylori. The purine metabolism in H. pylori is solely dependant on the salvage pathway and one of the key enzymes in this pathway is purine nucleoside phosphorylase (PNP). In this timely context, we report here the basic biochemical and structural characterization of recombinant PNP from the H...
March 20, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28335771/understanding-the-motivations-of-health-care-providers-in-performing-female-genital-mutilation-an-integrative-review-of-the-literature
#18
REVIEW
Marie-Hélène Doucet, Christina Pallitto, Danielle Groleau
BACKGROUND: Female genital mutilation (FGM) is a traditional harmful practice that can cause severe physical and psychological damages to girls and women. Increasingly, trained health-care providers carry out the practice at the request of families. It is important to understand the motivations of providers in order to reduce the medicalization of FGM. This integrative review identifies, appraises and summarizes qualitative and quantitative literature exploring the factors that are associated with the medicalization of FGM and/or re-infibulation...
March 23, 2017: Reproductive Health
https://www.readbyqxmd.com/read/28335770/a-model-of-influences-on-the-clinical-learning-environment-the-case-for-change-at-one-u-s-medical-school
#19
Howard B Fleit, Richard J Iuli, Janet E Fischel, Wei-Hsin Lu, Latha Chandran
BACKGROUND: The learning environment within a school of medicine influences medical students' values and their professional development. Despite national requirements to monitor the learning environment, mistreatment of medical students persists. METHODS: We designed a program called WE SMILE: We can Eradicate Student Mistreatment In the Learning Environment with a vision to enhance trainee and faculty awareness and ultimately eliminate medical student mistreatment...
March 23, 2017: BMC Medical Education
https://www.readbyqxmd.com/read/28335717/genomic-regions-underlying-susceptibility-to-bovine-tuberculosis-in-holstein-friesian-cattle
#20
Kethusegile Raphaka, Oswald Matika, Enrique Sánchez-Molano, Raphael Mrode, Mike Peter Coffey, Valentina Riggio, Elizabeth Janet Glass, John Arthur Woolliams, Stephen Christopher Bishop, Georgios Banos
BACKGROUND: The significant social and economic loss as a result of bovine tuberculosis (bTB) presents a continuous challenge to cattle industries in the UK and worldwide. However, host genetic variation in cattle susceptibility to bTB provides an opportunity to select for resistant animals and further understand the genetic mechanisms underlying disease dynamics. METHODS: The present study identified genomic regions associated with susceptibility to bTB using genome-wide association (GWA), regional heritability mapping (RHM) and chromosome association approaches...
March 23, 2017: BMC Genetics
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