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https://www.readbyqxmd.com/read/28533471/the-atypical-response-regulator-atvr-is-a-new-player-in-pseudomonas-aeruginosa-response-to-hypoxia-and-virulence
#1
Gilberto Hideo Kaihami, Leandro Carvalho Dantas Breda, José Roberto Fogaça de Almeida, Thays de Oliveira Pereira, Gianlucca Gonçalves Nicastro, Ana Laura Boechat, Sandro Rogério de Almeida, Regina Lúcia Baldini
Two-component systems are widespread in bacteria, allowing adaptation to environmental changes. The classical pathway is composed by a histidine kinase that phosphorylates an aspartate residue in the cognate response regulator (RR). RRs lacking the phosphorylable aspartate also occur, but their function and contribution during host-pathogen interaction are poorly characterized. AtvR (PA14_26570) is the only atypical response regulator with a DNA-binding domain in the opportunistic pathogen Pseudomonas aeruginosa Macrophage infection with the atvR mutant strain resulted in higher TNF-α secretion as well as increased bacterial clearance as compared to macrophages infected with the wild-type strain...
May 22, 2017: Infection and Immunity
https://www.readbyqxmd.com/read/28532398/clinical-outcomes-of-linezolid-and-vancomycin-in-patients-with-nosocomial-pneumonia-caused-by-methicillin-resistant-staphylococcus-aureus-stratified-by-baseline-renal-function-a-retrospective-cohort-analysis
#2
Ping Liu, Blair Capitano, Amy Stein, Ali A El-Solh
BACKGROUND: The primary objective of this study is to assess whether baseline renal function impacts treatment outcomes of linezolid and vancomycin (with a dose-optimized regimen) for methicillin-resistant Staphylococcus aureus (MRSA) pneumonia. METHODS: We conducted a retrospective cohort analysis of data generated from a prospective, randomized, controlled clinical trial (NCT 00084266). The analysis included 405 patients with culture-proven MRSA pneumonia. Baseline renal function was stratified based on creatinine clearance...
May 22, 2017: BMC Nephrology
https://www.readbyqxmd.com/read/28523002/humanized-mouse-models-of-staphylococcus-aureus-infection
#3
REVIEW
Dane Parker
Staphylococcus aureus is a successful human pathogen that has adapted itself in response to selection pressure by the human immune system. A commensal of the human skin and nose, it is a leading cause of several conditions: skin and soft tissue infection, pneumonia, septicemia, peritonitis, bacteremia, and endocarditis. Mice have been used extensively in all these conditions to identify virulence factors and host components important for pathogenesis. Although significant effort has gone toward development of an anti-staphylococcal vaccine, antibodies have proven ineffective in preventing infection in humans after successful studies in mice...
2017: Frontiers in Immunology
https://www.readbyqxmd.com/read/28516505/associations-between-nursing-home-performance-and-hospital-30-day-readmissions-for-acute-myocardial-infarction-heart-failure-and-pneumonia-at-the-healthcare-community-level-in-the-united-states
#4
Michelle M Pandolfi, Yun Wang, Ann Spenard, Florence Johnson, Alice Bonner, Shih-Yieh Ho, Timothy Elwell, Anila Bakullari, Deron Galusha, Erica Leifheit-Limson, Judith H Lichtman, Harlan M Krumholz
OBJECTIVES: To evaluate community-specific nursing home performance with community-specific hospital 30-day readmissions for Medicare patients discharged with acute myocardial infarction, heart failure or pneumonia. DESIGN: Cross-sectional study using 2009-2012 hospital risk-standardised 30-day readmission data for Medicare fee-for-service patients hospitalised for all three conditions and nursing home performance data from the Centers for Medicare & Medicaid Services Five-Star Quality Rating System...
May 17, 2017: International Journal of Older People Nursing
https://www.readbyqxmd.com/read/28516066/the-alpha-tocopherol-form-of-vitamin-e-boosts-elastase-activity-of-human-pmns-and-their-ability-to-kill-streptococcus-pneumoniae
#5
Elsa N Bou Ghanem, James N Lee, Basma H Joma, Simin N Meydani, John M Leong, Alexander Panda
Despite the availability of vaccines, Streptococcus pneumoniae remains a leading cause of life-threatening infections, such as pneumonia, bacteremia and meningitis. Polymorphonuclear leukocytes (PMNs) are a key determinant of disease course, because optimal host defense requires an initial robust pulmonary PMN response to control bacterial numbers followed by modulation of this response later in infection. The elderly, who manifest a general decline in immune function and higher basal levels of inflammation, are at increased risk of developing pneumococcal pneumonia...
2017: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/28515091/angiotensin-converting-enzyme-enhances-the-oxidative-response-and-bactericidal-activity-of-neutrophils
#6
Zakir Khan, Xiao Z Shen, Ellen A Bernstein, Jorge F Giani, Masahiro Eriguchi, Tuantuan V Zhao, Romer A Gonzalez-Villalobos, Sebastien Fuchs, George Y Liu, Kenneth E Bernstein
Angiotensin converting enzyme (ACE) inhibitors are widely used to reduce blood pressure. Here, we examined if ACE is important for the antibacterial effectiveness of neutrophils. ACE knockout mice or mice treated with an ACE inhibitor were more susceptible to bacterial infection by methicillin-resistant S. aureus (MRSA). In contrast, mice over expressing ACE in neutrophils (Neu(ACE) mice) have increased resistance to MRSA, and better in vitro killing of MRSA, P. aeruginosa, and K. pneumoniae ACE overexpression increased neutrophil production of reactive oxygen species (ROS) following MRSA challenge, an effect independent of the angiotensin II AT1 receptor...
May 17, 2017: Blood
https://www.readbyqxmd.com/read/28515075/pigr-and-pecam-1-bind-to-pneumococcal-adhesins-rrga-and-pspc-mediating-bacterial-brain-invasion
#7
Federico Iovino, Joo-Yeon Engelen-Lee, Matthijs Brouwer, Diederik van de Beek, Arie van der Ende, Merche Valls Seron, Peter Mellroth, Sandra Muschiol, Jan Bergstrand, Jerker Widengren, Birgitta Henriques-Normark
Streptococcus pneumoniae is the main cause of bacterial meningitis, a life-threating disease with a high case fatality rate despite treatment with antibiotics. Pneumococci cause meningitis by invading the blood and penetrating the blood-brain barrier (BBB). Using stimulated emission depletion (STED) super-resolution microscopy of brain biopsies from patients who died of pneumococcal meningitis, we observe that pneumococci colocalize with the two BBB endothelial receptors: polymeric immunoglobulin receptor (pIgR) and platelet endothelial cell adhesion molecule (PECAM-1)...
May 17, 2017: Journal of Experimental Medicine
https://www.readbyqxmd.com/read/28513594/regionally-compartmentalized-resident-memory-t-cells-mediate-naturally-acquired-protection-against-pneumococcal-pneumonia
#8
N Ms Smith, G A Wasserman, F T Coleman, K L Hilliard, K Yamamoto, E Lipsitz, R Malley, H Dooms, M R Jones, L J Quinton, J P Mizgerd
As children age, they become less susceptible to the diverse microbes causing pneumonia. These microbes are pathobionts that infect the respiratory tract multiple times during childhood, generating immunological memory. To elucidate mechanisms of such naturally acquired immune protection against pneumonia, we modeled a relevant immunological history in mice by infecting their airways with mismatched serotypes of Streptococcus pneumoniae (pneumococcus). Previous pneumococcal infections provided protection against a heterotypic, highly virulent pneumococcus, as evidenced by reduced bacterial burdens and long-term sterilizing immunity...
May 17, 2017: Mucosal Immunology
https://www.readbyqxmd.com/read/28513176/selective-inhibition-of-e-coli-rna-and-dna-topoisomerase-i-by-hoechst-33258-derived-mono-and-bisbenzimidazoles
#9
Nihar Ranjan, Sandra Story, Geraldine Fulcrand, Fenfei Leng, Muzammil Ahmad, Ada King, Souvik Sur, Weidong Wang, Yuk-Ching Tse-Dinh, Dev Priya Arya
A series of Hoechst 33258 based mono and bisbenzimidazoles have been synthesized and their E. coli DNA topoisomerase I inhibition, binding to B-DNA duplex and antibacterial activity has been evaluated. Bisbenzimidazoles with alkynyl side chains display excellent E. coli DNA topoisomerase I inhibition properties with IC50 values < 5.0 μM. Several bisbenzimidazoles (3, 6, 7, 8) also inhibit RNA topoisomerase activity of E. coli DNA topoisomerase I. Bisbenzimidazoles inhibit antibacterial growth much better than mono-benzimidazoles for gram positive strains...
May 17, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/28513136/cold-chain-free-storable-hydrogel-for-infant-friendly-oral-delivery-of-amoxicillin-for-the-treatment-of-pneumococcal-pneumonia
#10
Keming Xu, Liang Li, Mingyue Cui, Yiyuan Han, Huseyin Enis Karahan, Vincent Tak Kwong Chow, Chenjie Xu
Pneumonia is the major cause of death in children under five, particularly in developing countries. Antibiotics such as amoxicillin greatly help in mitigating this problem. However, there is lack of an infant/toddler-friendly formulation for countries with limited clean water and electricity. Here we report the development of a shear-thinning hydrogel system for the oral delivery of amoxicillin to the infant/toddler patients, without the need of clean water and refrigeration. The hydrogel formulation consists of metolose (hydroxypropyl methylcellulose) and amoxicillin...
May 17, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28512772/subspecialty-approach-for-the-management-of-acute-cholecystitis-an-alternative-to-acute-surgical-unit-model-of-care
#11
Sonia Tran, Vincent Choi, Kirsten Hepburn, Nathan Hewitt, Joel Zhou, Daniel L Chan, Michael L Talbot
BACKGROUND: Acute cholecystitis is a common condition. Recent studies have shown an association between creation of an acute surgical unit (ASU) and improved outcomes. This study aimed to evaluate the outcomes of a subspecialty based approach to the management of acute cholecystitis as an alternative to the traditional 'generalist' general surgery approach or the ASU model. METHOD: A 6-year retrospective analysis of outcomes in patients admitted under a dedicated upper gastrointestinal service for acute cholecystitis undergoing emergency laparoscopic cholecystectomy...
May 16, 2017: ANZ Journal of Surgery
https://www.readbyqxmd.com/read/28510994/improved-detection-of-burkholderia-pseudomallei-from-non-blood-clinical-specimens-using-enrichment-culture-and-pcr-narrowing-diagnostic-gap-in-resource-constrained-settings
#12
Chaitanya Tellapragada, Tushar Shaw, Annet D'Souza, Vandana Kalwaje Eshwara, Chiranjay Mukhopadhyay
OBJECTIVES: To evaluate the diagnostic utility of enrichment culture and PCR for improved case detection rates of non-bacteremic form of melioidosis in limited resource settings. METHODS: Clinical specimens (n=525) obtained from patients presenting at a tertiary care hospital of south India with clinical symptoms suggestive of community-acquired pneumonia, lower respiratory tract infections, superficial or internal abscesses, chronic skin ulcers and bone or joint infections were tested for the presence of Burkholderia pseudomallei using conventional culture (CC), enrichment culture (EC) and PCR...
May 16, 2017: Tropical Medicine & International Health: TM & IH
https://www.readbyqxmd.com/read/28507246/the-pneumococcal-type-1-pilus-genes-are-thermoregulated-and-are-repressed-by-a-member-of-the-snf2-protein-family
#13
Alan Basset, Muriel Herd, Raecliffe Daly, Simon L Dove, Richard Malley
In Streptococcus pneumoniae, the type 1 pilus is involved in many steps of pathogenesis, including adherence to epithelial cells, mediation of inflammation, escape from macrophages, and the formation of biofilms. The type 1 pilus genes are expressed in a bistable fashion with cells switching between ON and OFF expression states. Bistable expression of these genes is due to their control by RlrA, a positive regulator subject to control by a positive feedback loop. The type 1 pilus genes are also thought to be negatively regulated by a large number of repressors...
May 15, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28507106/efficacy-and-pharmacokinetics-of-the-combination-of-op0595-and-cefepime-in-a-mouse-model-of-pneumonia-caused-by-esbl-producing-klebsiella-pneumoniae
#14
Norihito Kaku, Kosuke Kosai, Kazuaki Takeda, Naoki Uno, Yoshitomo Morinaga, Hiroo Hasegawa, Taiga Miyazaki, Koichi Izumikawa, Hiroshi Mukae, Katsunori Yanagihara
Background: OP0595 (RG6080) is a novel diazobicyclooctane that inhibits class A and C serine beta-lactamases. Although the combination of OP0595 and cefepime (FEP) showed good in vitro activity against extended spectrum beta-lactamase (ESBL)-producing pathogens, the effect of the combination therapy against severe infections, such as pneumonia or bacteraemia, remains unknown in vivo.Objectives: In this study, we investigated the efficacy and pharmacokinetics of the combination therapy of OP0595 and FEP in a mouse model of pneumonia caused by Klebsiella pneumoniae harbouring SHV and CTX-M-9-type ESBLs...
May 15, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28506672/comparison-of-the-nosocomial-pneumonia-mortality-prediction-npmp-model-with-standard-mortality-prediction-tools
#15
M Srinivasan, N Shetty, S Gadekari, G Thunga, K Rao, V Kunhikatta
BACKGROUND: Severity or mortality prediction of nosocomial pneumonia could aid in the effective triage of patients and assisting physicians. AIM: To compare various severity assessment scoring systems for predicting intensive care unit (ICU) mortality in nosocomial pneumonia patients. METHODS: A prospective cohort study was conducted in a tertiary care university-affiliated hospital in Manipal, India. One hundred patients with nosocomial pneumonia, admitted in the ICUs who developed pneumonia after >48h of admission, were included...
April 15, 2017: Journal of Hospital Infection
https://www.readbyqxmd.com/read/28506354/-immunoprotective-effect-of-combined-pneumococcal-endopeptidase-o-and-pneumococcal-surface-adhesin-a-vaccines-against-streptococcus-pneumoniae-infection
#16
Jing Zhang, Ya-Li Cui, Yong-Mei Jiang
OBJECTIVE: To investigate the prokaryotic expression of proteins pneumococcal endopeptidase O (PepO) and pneumococcal surface adhesin A (PsaA) in Streptococcus pneumoniae and their immunoprotective effect as vaccine candidate proteins. METHODS: Specific primers of target gene fragments were designed, and then PCR amplification was performed to establish recombinant plasmids pET28a(+)-pepO and pET28a(+)-psaA, which were transformed into host cells, Escherichia coli BL21 and DE3, respectively, to induce expression...
May 2017: Zhongguo Dang Dai Er Ke za Zhi, Chinese Journal of Contemporary Pediatrics
https://www.readbyqxmd.com/read/28502419/the-performance-of-the-gap-model-in-patients-with-rheumatoid-arthritis-associated-interstitial-lung-disease
#17
Julie Morisset, Eric Vittinghoff, Bo Young Lee, Roberto Tonelli, Xiaowen Hu, Brett M Elicker, Jay H Ryu, Kirk D Jones, Stefania Cerri, Andreina Manfredi, Marco Sebastiani, Andrew J Gross, Brett Ley, Paul J Wolters, Talmadge E King, Dong Soon Kim, Harold R Collard, Joyce S Lee
BACKGROUND: Rheumatoid arthritis-associated interstitial lung disease (RA-ILD) is associated with significant morbidity and mortality. Similarities have been observed between patients with idiopathic pulmonary fibrosis (IPF) and the UIP (usual interstitial pneumonia) form of RA-ILD. The GAP (gender, age, physiology) model has been shown to predict mortality in patients with IPF, but its ability to predict mortality in RA-ILD is not known. METHODS: We identified 309 patients with RA-ILD at 4 academic centers with ongoing longitudinal cohorts of patients with ILD...
June 2017: Respiratory Medicine
https://www.readbyqxmd.com/read/28501135/impact-of-hernia-volume-on-pulmonary-complications-following-complex-hernia-repair
#18
Elwin H H Mommers, Johannes A Wegdam, Sander van der Wolk, Simon W Nienhuijs, Tammo S de Vries Reilingh
BACKGROUND: Despite a multitude of evidence-based prediction models and risk factors for postoperative complications after ventral hernia repair, estimating a patient's risk of postoperative complications after ventral hernia repair remains challenging. In an attempt to improve the preoperative assessment of complex hernia patients, some studies have examined pulmonary changes after hernia repair hypothesizing that large hernias lead to pulmonary changes and increased pulmonary complication rates...
May 1, 2017: Journal of Surgical Research
https://www.readbyqxmd.com/read/28500813/quality-of-case-management-for-pneumonia-and-diarrhea-among-children-seen-at-health-facilities-in-southern-malawi
#19
Miwako Kobayashi, Dyson Mwandama, Humphreys Nsona, Ruth J Namuyinga, Monica P Shah, Andrew Bauleni, Jodi Vanden Eng, Alexander K Rowe, Don P Mathanga, Laura C Steinhardt
AbstractPneumonia and diarrhea are leading causes of child deaths in Malawi. Guidelines to manage childhood illnesses in resource-poor settings exist, but studies have reported low health-care worker (HCW) adherence to guidelines. We conducted a health facility survey from January to March 2015 to assess HCW management of pneumonia and diarrhea in children < 5 years of age in southern Malawi, and to determine factors associated with case management quality. Descriptive statistics and multivariable logistic regression models examined patient, HCW, and health facility factors associated with recommended pneumonia and diarrhea management, using Malawi's national guidelines as the gold standard...
May 2017: American Journal of Tropical Medicine and Hygiene
https://www.readbyqxmd.com/read/28498857/cost-effectiveness-of-pneumococcal-vaccination-strategies-for-the-elderly-in-korea
#20
Jung Yeon Heo, Yu Bin Seo, Won Suk Choi, Jacob Lee, Ji Yun Noh, Hye Won Jeong, Woo Joo Kim, Min Ja Kim, Hee Young Lee, Joon Young Song
BACKGROUND: Although the 13-valent pneumococcal conjugate vaccine (PCV13) showed good efficacy against pneumococcal disease in the the CAPiTA trial, the 23-valent pneumococcal polysaccharide vaccination (PPSV23) program has been ongoing for older adults aged ≥ 65 years in Korea since May of 2013. This study aimed to evaluate the cost-effectiveness of the current vaccination strategy (a single-dose PPSV23 vaccination) compared to a single-dose PCV13 vaccination and sequential PCV13-PPSV23 vaccinations in the elderly population aged ≥ 65 years...
2017: PloS One
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