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https://www.readbyqxmd.com/read/29763730/virtual-screening-of-plant-compounds-and-nonsteroidal-anti-inflammatory-drugs-for-inhibition-of-quorum-sensing-and-biofilm-formation-in-salmonella
#1
Felipe Alves de Almeida, Erika Lorena Giraldo Vargas, Deisy Guimarães Carneiro, Uelinton Manoel Pinto, Maria Cristina Dantas Vanetti
Salmonella belongs to the Enterobacteriaceae family which is widely distributed in the environment due to its adaptive capacity to stress conditions. In addition, Salmonella is able to perform a type of cell-to-cell communication called quorum sensing, which leads to differential gene expression. The quorum sensing system mediated by AI-1, acyl homoserine lactones (AHLs), is incomplete in Salmonella because the luxI homolog gene, which encodes for AI-1 synthase, is missing in the genome. However, a homologue of LuxR, known as SdiA, is present and allows the detection of signaling molecules produced by other species of bacteria, leading to regulation of gene expression, mainly related to virulence and biofilm formation...
May 12, 2018: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29762495/role-of-sdia-on-biofilm-formation-by-atypical-enteropathogenic-escherichia-coli
#2
Hebert F Culler, Samuel C F Couto, Juliana S Higa, Renato M Ruiz, Min J Yang, Vanessa Bueris, Marcia R Franzolin, Marcelo P Sircili
Atypical enteropathogenic Escherichia coli are capable to form biofilm on biotic and abiotic surfaces, regardless of the adherence pattern displayed. Several E. coli mechanisms are regulated by Quorum sensing (QS), including virulence factors and biofilm formation. Quorum sensing is a signaling system that confers bacteria with the ability to respond to chemical molecules known as autoinducers. Suppressor of division inhibitor (SdiA) is a QS receptor present in atypical enteropathogenic E. coli (aEPEC) that detects acyl homoserine lactone (AHL) type autoinducers...
May 15, 2018: Genes
https://www.readbyqxmd.com/read/29755959/pvdq-quorum-quenching-acylase-attenuates-pseudomonas-aeruginosa-virulence-in-a-mouse-model-of-pulmonary-infection
#3
Putri D Utari, Rita Setroikromo, Barbro N Melgert, Wim J Quax
Pseudomonas aeruginosa is the predominant pathogen in pulmonary infections associated with cystic fibrosis. Quorum sensing (QS) systems regulate the production of virulence factors and play an important role in the establishment of successful P. aeruginosa infections. Inhibition of the QS system (termed quorum quenching) renders the bacteria avirulent thus serving as an alternative approach in the development of novel antibiotics. Quorum quenching in Gram negative bacteria can be achieved by preventing the accumulation of N -acyl homoserine lactone (AHL) signaling molecule via enzymatic degradation...
2018: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29748385/activation-of-airway-epithelial-bitter-taste-receptors-by-pseudomonas-aeruginosa-quinolones-modulates-calcium-cyclic-amp-and-nitric-oxide-signaling
#4
Jenna R Freund, Corrine J Mansfield, Laurel J Doghramji, Nithin D Adappa, James N Palmer, David W Kennedy, Danielle R Reed, Peihua Jiang, Robert J Lee
Bitter taste receptors (T2Rs), discovered in many tissues outside the tongue, have recently become potential therapeutic targets. We showed previously that airway epithelial cells express several T2Rs that activate innate immune responses that may be important for treatment of airway diseases such as chronic rhinosinusitis. It is imperative to more clearly understand what compounds activate airway T2Rs as well as their full range of functions. T2R isoforms in airway motile cilia (T2Rs 4, 14, 16, and 38) produce bactericidal levels of nitric oxide (NO) that also increase ciliary beating, promoting clearance of mucus and trapped pathogens...
May 10, 2018: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/29740543/quorum-sensing-signaling-and-quenching-in-the-multidrug-resistant-pathogen-stenotrophomonas-maltophilia
#5
REVIEW
Pol Huedo, Xavier Coves, Xavier Daura, Isidre Gibert, Daniel Yero
Stenotrophomonas maltophilia is an opportunistic Gram-negative pathogen with increasing incidence in clinical settings. The most critical aspect of S. maltophilia is its frequent resistance to a majority of the antibiotics of clinical use. Quorum Sensing (QS) systems coordinate bacterial populations and act as major regulatory mechanisms of pathogenesis in both pure cultures and poly-microbial communities. Disruption of QS systems, a phenomenon known as Quorum Quenching (QQ), represents a new promising paradigm for the design of novel antimicrobial strategies...
2018: Frontiers in Cellular and Infection Microbiology
https://www.readbyqxmd.com/read/29739895/long-term-survival-rates-of-patients-with-stage-iii-iv-hodgkin-lymphoma-according-to-age-sex-race-and-socioeconomic-status-1984-2013
#6
Yushi Li, Huanhuan Sun, Yan Yan, Tiantian Sun, Shuncong Wang, Haiqing Ma
BACKGROUND: Long-term survival rates for patients with stage III-IV Hodgkin lymphoma, or advanced Hodgkin lymphoma (aHL), have increased substantially since the 1960s. Because large-scale research of aHL is rare, we aimed to demonstrate the differences in incidence and survival of aHL according to four patient variables in recent decades, with a focus on the outcomes of treatment of aHL and the advancement of public health care. MATERIALS AND METHODS: Data on aHL cases diagnosed during 1984-2013 were extracted from the Surveillance, Epidemiology, and End Results Program database...
May 8, 2018: Oncologist
https://www.readbyqxmd.com/read/29735954/design-and-synthesis-of-lactams-derived-from-mucochloric-and-mucobromic-acids-as-pseudomonas-aeruginosa-quorum-sensing-inhibitors
#7
Basmah Almohaywi, Aditi Taunk, Daniel S Wenholz, Shashidhar Nizalapur, Nripendra N Biswas, Kitty K K Ho, Scott A Rice, George Iskander, David StC Black, Renate Griffith, Naresh Kumar
Bacterial infections, particularly hospital-acquired infections caused by Pseudomonas aeruginosa , have become a global threat with a high mortality rate. Gram-negative bacteria including P. aeruginosa employ N -acyl homoserine lactones (AHLs) as chemical signals to regulate the expression of pathogenic phenotypes through a mechanism called quorum sensing (QS). Recently, strategies targeting bacterial behaviour or QS have received great attention due to their ability to disarm rather than kill pathogenic bacteria, which lowers the evolutionary burden on bacteria and the risk of resistance development...
May 7, 2018: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/29735757/malleilactone-is-a-burkholderia-pseudomallei-virulence-factor-regulated-by-antibiotics-and-quorum-sensing
#8
Jennifer R Klaus, Jacqueline Deay, Benjamin Neuenswander, Wyatt Hursh, Zhe Gao, Tiffany Bouddhara, Todd D Williams, Justin Douglas, Kyle Monize, Patricia Martins, Charlotte Majerczyk, Mohammad R Seyedsayamdost, Blake R Peterson, Mario Rivera, Josephine R Chandler
Burkholderia pseudomallei , the causative agent of melioidosis, encodes almost a dozen predicted polyketide (PK) biosynthetic gene clusters. Many of these are regulated by LuxR-I-type acyl-homoserine (AHL) quorum-sensing systems. One of the PK gene clusters, the mal gene cluster, is conserved in the close relative Burkholderia thailandensis. The B. thailandensis mal genes code for the cytotoxin malleilactone and are regulated by a genetically linked LuxR-type transcription factor, MalR. Although AHLs typically interact with LuxR-type proteins to modulate gene transcription, the B...
May 7, 2018: Journal of Bacteriology
https://www.readbyqxmd.com/read/29729601/exogenous-acyl-homoserine-lactones-adjust-community-structures-of-bacteria-and-methanogens-to-ameliorate-the-performance-of-anaerobic-granular-sludge
#9
Longyi Lv, Weiguang Li, Zejia Zheng, Donghui Li, Ning Zhang
Quorum sensing (QS) signalling has been extensively studied in single species populations, activated sludge, biofilm and aerobic granular sludge. However, ecological roles of QS in anaerobic granular sludge, particularly in the content of the relationship between QS signalling and microbial community composition and function, have been rarely reported. Herein, five acyl-homoserine lactones (AHLs) molecules were added in the anaerobic granular sludge system for treating traditional Chinese medicine (TCM) wastewater respectively...
April 30, 2018: Journal of Hazardous Materials
https://www.readbyqxmd.com/read/29724903/natural-history-of-gata2-deficiency-in-a-survey-of-79-french-and-belgian-patients
#10
Jean Donadieu, Marie Lamant, Claire Fieschi, Flore Sicre de Fontbrune, Aurélie Caye, Marie Ouachee, Blandine Beaupain, Jacinta Bustamante, Hélène A Poirel, Bertrand Isidor, Eric Van Den Neste, Antoine Neel, Stanislas Nimubona, Fabienne Toutain, Vincent Barlogis, Nicolas Schleinitz, Thierry Leblanc, Pierre Rohrlich, Felipe Suarez, Dana Ranta, Wahid Abou Chahla, Bénédicte Bruno, Louis Terriou, Sylvie Francois, Bruno Lioure, Guido Ahle, Françoise Bachelerie, Claude Preudhomme, Eric Delabesse, Hélène Cavé, Christine Bellanné-Chantelot, Marlène Pasquet
Heterozygous germline GATA2 mutations strongly predispose to leukaemia, immunodeficiency, and/or lymphoedema. We now describe a series of 79 patients (53 families) diagnosed since 2011, compiling all patients in France and Belgium, with a follow up of 2249 patients/years. Median age at first clinical symptoms was 18.6 years (range, 0-61 years). Severe infectious diseases (mycobacteria, fungus, and human papilloma virus) and haematological malignancies were the most common first manifestations. The probability of remaining symptom-free was 8% at 40 years old...
May 3, 2018: Haematologica
https://www.readbyqxmd.com/read/29720224/assessing-brain-volume-changes-in-older-women-with-breast-cancer-receiving-adjuvant-chemotherapy-a-brain-magnetic-resonance-imaging-pilot-study
#11
Bihong T Chen, Sean K Sethi, Taihao Jin, Sunita K Patel, Ningrong Ye, Can-Lan Sun, Russell C Rockne, E Mark Haacke, James C Root, Andrew J Saykin, Tim A Ahles, Andrei I Holodny, Neal Prakash, Joanne Mortimer, James Waisman, Yuan Yuan, George Somlo, Daneng Li, Richard Yang, Heidi Tan, Vani Katheria, Rachel Morrison, Arti Hurria
BACKGROUND: Cognitive decline is among the most feared treatment-related outcomes of older adults with cancer. The majority of older patients with breast cancer self-report cognitive problems during and after chemotherapy. Prior neuroimaging research has been performed mostly in younger patients with cancer. The purpose of this study was to evaluate longitudinal changes in brain volumes and cognition in older women with breast cancer receiving adjuvant chemotherapy. METHODS: Women aged ≥ 60 years with stage I-III breast cancer receiving adjuvant chemotherapy and age-matched and sex-matched healthy controls were enrolled...
May 2, 2018: Breast Cancer Research: BCR
https://www.readbyqxmd.com/read/29708571/reliability-of-the-anterior-humeral-line-index-compared-with-the-gartland-classification-for-posteriorly-hinged-supracondylar-humerus-fractures
#12
Margaret Siobhan Murphy-Zane, Laura Pyle
The Gartland classification of pediatric supracondylar humerus (SCH) fractures is commonly used but inconsistently defined regarding type 1 and type 2 (posteriorly hinged) SCH fractures. This study examined the reliability of the anterior humeral line (AHL) index compared with the Gartland classification. Fifty consecutive SCH fractures on anteroposterior and lateral elbow radiographs in pediatric patients (age range, 18 months to 15 years) were classified by 11 observers (9 attendings and 2 residents) according to the Gartland classification (types 1, 2, and 3) and the AHL index (AHL0, AHL passes anterior to the capitellum; AHL1, anterior one-third capitellum; and AHL2, middle one-third capitellum), with recommendations for treatment (cast immobilization vs surgery)...
April 27, 2018: Orthopedics
https://www.readbyqxmd.com/read/29705275/conformational-studies-of-gram-negative-bacterial-quorum-sensing-acyl-homoserine-lactone-ahl-molecules-the-importance-of-the-n-%C3%A2-%C3%AF-interaction
#13
Goar Sánchez-Sanz, Darren Crowe, Alan Nicholson, Adrienne Fleming, Ed Carey, Fintan Kelleher
A 1 H NMR study shows the presence of intermolecular hydrogen bonds for AHLs in CDCl3 solution. A detailed computational study of the structure of AHLs and the relative stability between the extended conformations (X) and those showing n → π* interactions (np) have been carried out by means of DFT calculations. Solvent effects have been shown to be very important when stabilising np conformations, particularly with polar solvents. This was shown by the shortening of C⋯O intramolecular distances and the increase in the relative energies favouring the np conformation with the dielectric constant of the solvent...
April 17, 2018: Biophysical Chemistry
https://www.readbyqxmd.com/read/29696336/the-attachment-potential-and-n-acyl-homoserine-lactone-based-quorum-sensing-in-aerobic-granular-sludge-and-algal-bacterial-granular-sludge
#14
Bing Zhang, Piet N L Lens, Wenxin Shi, Ruijun Zhang, Zhiqiang Zhang, Yuan Guo, Xian Bao, Fuyi Cui
Bacteria and algae often coexist in the aerobic granular sludge (AGS) system in a photo-bioreactor, forming algal-bacterial granular sludge. In this study, the physicochemical characteristics and microbial attachment potential of the AGS and algal-bacterial granular sludge were comparatively analyzed. Results clearly showed that the larger and denser algal-bacterial granular sludge had stronger attachment potential compared to the AGS (as the control). A bioassay with Agrobacterium tumefaciens KYC55 indicated that N-acyl-homoserine lactones (AHLs) existed in both sludge types, but further investigations revealed that the relative AHL content of the algal-bacterial granular sludge obviously increased and slightly decreased during phases II and III, respectively, but was consistently higher than the AGS...
April 25, 2018: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/29694709/identification-of-n-acyl-homoserine-lactone-degrading-bacteria-isolated-from-rainbow-trout-oncorhynchus-mykiss
#15
Somayeh Torabi Delshad, Siyavash Soltanian, Hassan Sharifiyazdi, Masoud Haghkhah, Peter Bossier
AIMS: A variety of pathogens use quorum sensing (QS) to control the expression of their virulence factors. QS interference has hence been proposed as a promising anti-virulence strategy. The specific aim of this study was to isolate bacteria from trout tissue able to degrade N-Acyl Homoserine Lactones (AHL), a QS molecule family. METHODS AND RESULTS: In total 132 isolates were screened for AHL degradation using Chromobacterium violaceum CV026 as a biosensor. Twenty four quorum quenching (QQ) isolates were identified biochemically and characterized using 16S rDNA sequencing...
April 25, 2018: Journal of Applied Microbiology
https://www.readbyqxmd.com/read/29666543/spoilage-of-refrigerated-litopenaeus-vannamei-eavesdropping-on-acinetobacter-acyl-homoserine-lactones-promotes-the-spoilage-potential-of-shewanella-baltica
#16
Suqin Zhu, Haohao Wu, Caili Zhang, Jinxin Jie, Zunying Liu, Mingyong Zeng, Changyun Wang
Shewanella baltica and Acinetobacter are among the predominant spoilage bacteria in refrigerated shrimp ( Litopenaeus vannamei ). S. baltica are incapable of producing acyl-homoserine lactone (AHL) quorum sensing signals, but can respond to environmental AHLs. In this paper, Acinetobacter was found to produce three AHLs, i.e. N -butanoyl-l-homoserine lactone (C4-HSL), N -(3-oxohexanoyl)-l-homoserine lactone (O-C6-HSL) and N -(3-oxooctanoyl)-l-homoserine lactone (O-C8-HSL), according to thin-layer chromatography using the bioreporter Agrobacterium tumefaciens A136...
May 2018: Journal of Food Science and Technology
https://www.readbyqxmd.com/read/29664914/ahl-lactonase-expression-in-three-marine-emerging-pathogenic-vibrio-spp-reduces-virulence-and-mortality-in-brine-shrimp-artemia-salina-and-manila-clam-venerupis-philippinarum
#17
Marta Torres, José Carlos Reina, Juan Carlos Fuentes-Monteverde, Gerardo Fernández, Jaime Rodríguez, Carlos Jiménez, Inmaculada Llamas
Bacterial infectious diseases produced by Vibrio are the main cause of economic losses in aquaculture. During recent years it has been shown that the expression of virulence genes in some Vibrio species is controlled by a population-density dependent gene-expression mechanism known as quorum sensing (QS), which is mediated by the diffusion of signal molecules such as N-acylhomoserine lactones (AHLs). QS disruption, especially the enzymatic degradation of signalling molecules, known as quorum quenching (QQ), is one of the novel therapeutic strategies for the treatment of bacterial infections...
2018: PloS One
https://www.readbyqxmd.com/read/29662232/characterization-of-aiik-an-ahl-lactonase-from-kurthia-huakui-lam0618-t-and-its-application-in-quorum-quenching-on-pseudomonas-aeruginosa-pao1
#18
Weiwei Dong, Jie Zhu, Xiang Guo, Delong Kong, Qi Zhang, Yiqing Zhou, Xiaoyang Liu, Shumiao Zhao, Zhiyong Ruan
N-Acyl homoserine lactones (AHLs) act as the key quorum sensing (QS) signal molecules in gram-negative bacteria, which coordinates gene expression and then activates various processes, including biofilm formation and production of virulence factors in some pathogens. Quorum quenching (QQ), which is the inactivation of the signal molecules by means of enzymatic degradation or modification, inhibits the processes of QS rather than killing the pathogens and is a promising antipathogenic strategy to control the bacterial pathogens...
April 16, 2018: Scientific Reports
https://www.readbyqxmd.com/read/29659511/quorum-sensing-and-quorum-quenching-in-agrobacterium-a-go-no-go-system
#19
REVIEW
Yves Dessaux, Denis Faure
The pathogen Agrobacterium induces gall formation on a wide range of dicotyledonous plants. In this bacteria, most pathogenicity determinants are borne on the tumour inducing (Ti) plasmid. The conjugative transfer of this plasmid between agrobacteria is regulated by quorum sensing (QS). However, processes involved in the disturbance of QS also occur in this bacteria under the molecular form of a protein, TraM, inhibiting the sensing of the QS signals, and two lactonases BlcC (AttM) and AiiB that degrade the acylhomoserine lactone (AHL) QS signal...
April 16, 2018: Genes
https://www.readbyqxmd.com/read/29623123/an-air-stable-bisboron-complex-a-practical-bidentate-lewis-acid-catalyst
#20
Longcheng Hong, Sebastian Ahles, Andreas H Heindl, Gastelle Tiétcha, Andrey Petrov, Zhenpin Lu, Christian Logemann, Hermann A Wegner
We report an air-stable bisboron complex as an efficient catalyst for the inverse electron-demand Diels-Alder (IEDDA) reaction of 1,2-diazine as well as 1,2,4,5-tetrazine. Its stability towards air and moisture was demonstrated by NMR studies enabling its application in organic transformations without glovebox. A one-pot procedure for its synthesis was developed starting from 1,2-bis(trimethylsilyl)benzene greatly enhancing its practicality. Comparative reactions were carried out to evaluate its catalytic activity in IEDDA reactions of diazine including phthalazine as well as 1,2,4,5-tetrazine...
2018: Beilstein Journal of Organic Chemistry
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