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Quorum sensing inhibition, Pseudomonas aeruginosa

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https://www.readbyqxmd.com/read/27902410/inhibition-of-quorum-sensing-controlled-virulence-factors-of-pseudomonas-aeruginosa-by-murraya-koenigii-essential-oil-a-study-in-a-caenorhabditis-elegans-infectious-model
#1
P Sankar Ganesh, Ravishankar Vittal Rai
The global emergence of antibiotic resistant strains of Pseudomonas aeruginosa poses a major threat in hospital environments as well as in the community. P. aeruginosa is an opportunistic human pathogen and it also infects a wide range of model organisms including the nematode Caenorhabditis elegans. Quorum sensing (QS) mediates cell-to-cell communication in bacteria and has an important role in regulating virulence genes, antibiotic resistance and biofilm formation which are crucial for establishment of the infection...
November 3, 2016: Journal of Medical Microbiology
https://www.readbyqxmd.com/read/27896412/the-bacterial-quorum-sensing-molecule-n-3-oxo-dodecanoyl-l-homoserine-lactone-inhibits-mediator-release-and-chemotaxis-of-murine-mast-cells
#2
Ibrahim Khambati, Sangsu Han, Daniëlle Pijnenburg, Hannah Jang, Paul Forsythe
OBJECTIVE: Bacterial colonization relies on communication between bacteria via so-called "quorum-sensing molecules", which include the acyl-homoserine lactone group. Certain acyl-homoserine lactones can modulate mammalian cell function and are thought to contribute to bacterial pathogenicity. Given the role of mast cells in host defense, we investigated the ability of acyl-homoserine lactones to modulate mast cell function. METHODS: We utilized murine primary mast cell cultures to assess the effect of acyl-homoserine lactones on degranulation and cytokine release in response to different stimuli...
November 28, 2016: Inflammation Research: Official Journal of the European Histamine Research Society ... [et Al.]
https://www.readbyqxmd.com/read/27874198/crataeva-nurvala-nanoparticles-inhibit-virulence-factors-and-biofilm-formation-in-clinical-isolates-of-pseudomonas-aeruginosa
#3
Syed Ghazanfar Ali, Mohammad Azam Ansari, Haris M Khan, Mohammad Jalal, Abbas Ali Mahdi, Swaranjit Singh Cameotra
Green synthesized nanoparticles have gained great attention due to their non-toxic and non-hazardous nature. In the present study, bark extract of the medicinal plant in Ayurveda Crataeva nurvala (Buch-Ham) (CN) was chosen for the biosynthesis of silver nanoparticles (AgNPs). These NPs were characterized by Ultra violet visible spectroscopy, Fourier Transform Infra Red, Atomic Force Microscopy, and Transmission Electron Microscopy (TEM). The average particle size of green synthesized CN-AgNPs was 15.2 ± 1...
November 22, 2016: Journal of Basic Microbiology
https://www.readbyqxmd.com/read/27864804/activity-of-norspermidine-on-bacterial-biofilms-of-multidrug-resistant-clinical-isolates-associated-with-persistent-extremity-wound-infections
#4
Anthony P Cardile, Ronald L Woodbury, Carlos J Sanchez, Sandra C Becerra, Rebecca A Garcia, Katrin Mende, Joseph C Wenke, Kevin S Akers
Biofilm formation is a major virulence factor for numerous pathogenic bacteria and is cited as a central event in the pathogenesis of chronic human infections, which is in large part due to excessive extracellular matrix secretion and metabolic changes that occur within the biofilm rendering them highly tolerant to antimicrobial treatments. Polyamines, including norspermidine, play central roles in bacterial biofilm development, but have also recently been shown to inhibit biofilm formation in select strains of various pathogenic bacteria...
November 19, 2016: Advances in Experimental Medicine and Biology
https://www.readbyqxmd.com/read/27834332/attenuation-of-quorum-sensing-regulated-behaviour-by-tinospora-cordifolia-extract-identification-of-its-active-constituents
#5
Viraj C Gala, Nithya R John, Ashok M Bhagwat, Ajit G Datar, Prashant S Kharkar, Krutika B Desai
BACKGROUND & OBJECTIVES: The pathogenicity of the nosocomial pathogens, Pseudomonas aeruginosa and Acinetobacter baumannii is regulated by their quorum sensing (QS) systems. The objective of the present study was to examine the effect of the cold ethyl acetate extract of Tinospora cordifolia stem on virulence and biofilm development in the wild type and clinical strains of P. aeruginosa and A. baumannii. The study was further aimed to identify the probable active constituents in the plant extract...
July 2016: Indian Journal of Medical Research
https://www.readbyqxmd.com/read/27784787/epigallocatechin-gallate-remodels-overexpressed-functional-amyloids-in-pseudomonas-aeruginosa-and-increases-biofilm-susceptibility-to-antibiotic-treatment
#6
Marcel Stenvang, Morten S Dueholm, Brian S Vad, Thomas W Seviour, Guanghong Zeng, Susana Geifman-Shochat, Mads T Søndergaard, Gunna Christiansen, Rikke Louise Meyer, Staffan Kjelleberg, Per Halkjær Nielsen, Daniel E Otzen
Epigallocatechin-3-gallate (EGCG) is the major polyphenol in green tea. It has anti-microbial properties and disrupts the ordered structure of amyloid fibrils involved in human disease. The anti-microbial effect of EGCG against the opportunistic pathogen Pseudomonas aeruginosa has been shown to involve disruption of quorum sensing (QS). Functional amyloid fibrils in P. aeruginosa (Fap) are able to bind and retain quorum sensing molecules, suggesting that EGCG interferes with QS through structural remodeling of amyloid fibrils...
October 26, 2016: Journal of Biological Chemistry
https://www.readbyqxmd.com/read/27756390/determination-of-n-acylhomoserine-lactones-of-pseudomonas-aeruginosa-in-clinical-samples-from-dogs-with-otitis-externa
#7
Darja Kušar, Karin Šrimpf, Petra Isaković, Lina Kalšek, Javid Hosseini, Irena Zdovc, Tina Kotnik, Modest Vengušt, Gabrijela Tavčar-Kalcher
BACKGROUND: Bacterial intercellular communication, called quorum sensing, takes place via the production and collective response to signal molecules. In Gram-negative bacteria, like Pseudomonas aeruginosa, these signaling molecules are N-acylhomoserine lactones (AHLs). P. aeruginosa is a common cause of inflammation of the ear canal (otitis externa) in dogs. It employs quorum sensing to coordinate the expression of host tissue-damaging factors, which are largely responsible for its virulence...
October 18, 2016: BMC Veterinary Research
https://www.readbyqxmd.com/read/27702795/prevention-of-polymicrobial-biofilms-composed-of-pseudomonas-aeruginosa-and-pathogenic-fungi-by-essential-oils-from-selected-citrus-species
#8
Marina Pekmezovic, Ivana Aleksic, Aleksandra Barac, Valentina Arsic-Arsenijevic, Branka Vasiljevic, Jasmina Nikodinovic-Runic, Lidija Senerovic
Mixed microbial infections caused by Pseudomonas aeruginosa and pathogenic fungi are commonly found in patients with chronic infections and constitute a significant health care burden. The aim of this study was to address the potential polymicrobial antibiofilm activity of pompia and grapefruit essential oils (EOs). The mechanism of antimicrobial activity of EOs was analysed. EOs of pompia and grapefruit inhibited fungal growth with MIC concentrations between 50 and 250 mg L(-1), whereas no effect on P. aeruginosa growth was observed...
November 2016: Pathogens and Disease
https://www.readbyqxmd.com/read/27696655/coprinuslactone-protects-the-edible-mushroom-coprinus-comatus-against-biofilm-infections-by-blocking-both-quorum-sensing-and-mura
#9
Maira P de Carvalho, Giuseppe Gulotta, Matheus W do Amaral, Heinrich Lünsdorf, Florenz Sasse, Wolf-Rainer Abraham
Pathogens embedded in biofilms are involved in many infections and are very difficult to treat with antibiotics because of higher resistance compared with planktonic cells. Therefore, new approaches for their control are urgently needed. One way to search for biofilm dispersing compounds is to look at defense strategies of organisms exposed to wet environments, which makes them prone to biofilm infections. It is reasonable to assume that mushrooms have developed mechanisms to control biofilms on their sporocarps (fruiting bodies)...
November 2016: Environmental Microbiology
https://www.readbyqxmd.com/read/27694949/a-quorum-sensing-signal-promotes-host-tolerance-training-through-hdac1-mediated-epigenetic-reprogramming
#10
Arunava Bandyopadhaya, Amy Tsurumi, Damien Maura, Kate L Jeffrey, Laurence G Rahme
The mechanisms by which pathogens evade elimination without affecting host fitness are not well understood. For the pathogen Pseudomonas aeruginosa, this evasion appears to be triggered by excretion of the quorum-sensing molecule 2-aminoacetophenone, which dampens host immune responses and modulates host metabolism, thereby enabling the bacteria to persist at a high burden level. Here, we examined how 2-aminoacetophenone trains host tissues to become tolerant to a high bacterial burden, without compromising host fitness...
October 3, 2016: Nature Microbiology
https://www.readbyqxmd.com/read/27683577/is-quorum-sensing-interference-a-viable-alternative-to-treat-pseudomonas-aeruginosa-infections
#11
Rodolfo García-Contreras
Quorum sensing (QS) coordinates the expression of multiple virulence factors in Pseudomonas aeruginosa; hence its inhibition has been postulated as a new alternative to treat its infections. In particular, QS interference approaches claim that they attenuate bacterial virulence without directly decreasing bacterial growth and suggest that in vivo the immune system would control the infections. Moreover, since in vitro experiments performed in rich medium demonstrate that interfering with QS decreases the production of virulence factors without affecting bacterial growth it was assumed than in vivo therapies will minimize the selection of resistant strains...
2016: Frontiers in Microbiology
https://www.readbyqxmd.com/read/27664726/role-of-ppgpp-in-pseudomonas-aeruginosa-acute-pulmonary-infection-and-virulence-regulation
#12
Xiaohui Xu, Hua Yu, Di Zhang, Junzhi Xiong, Jing Qiu, Rong Xin, Xiaomei He, Halei Sheng, Wenqiang Cai, Lu Jiang, Kebin Zhang, Xiaomei Hu
During infection, bacteria might generate adaptive responses to facilitate their survival and colonization in the host environment. The alarmone guanosine 5'-triphosphate-3'-diphosphate (ppGpp), the levels of which are regulated by the RelA and SpoT enzymes, plays a critical role in mediating bacterial adaptive responses and virulence. However, the mechanism by which ppGpp regulates virulence-associated traits in Pseudomonas aeruginosa is poorly understood. To investigate the regulatory role of ppGpp, the ppGpp-deficient strain ΔRS (relA and spoT gene double mutant) and the complemented strain ΔRS(++) (complemented with relA and spoT genes) were constructed...
November 2016: Microbiological Research
https://www.readbyqxmd.com/read/27645245/potential-use-of-dimethyl-sulfoxide-in-treatment-of-infections-caused-by-pseudomonas-aeruginosa
#13
Qiao Guo, Qiaolian Wu, Dangdang Bai, Yang Liu, Lin Chen, Sheng Jin, Yuting Wu, Kangmin Duan
Dimethyl Sulfoxide (DMSO) is commonly used as a solvent to dissolve water-insoluble drugs or other test samples in both in vivo and in vitro experiments. It was observed during our experiment that DMSO at non-inhibitory concentrations could significantly inhibit pyocyanin production in human pathogen Pseudomonas aeruginosa. Pyocyanin is an important pathogenic factor whose production is controlled by cell-density dependent quorum-sensing (QS) system. Investigation of the effect of DMSO on QS shows that DMSO has significant QS antagonistic activities, and micromolar range concentrations of DMSO attenuated a battery of QS-controlled virulence factors, including rhamnolipids, elastase, LasA protease and biofilm formation...
September 19, 2016: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/27634359/phytochemicals-as-effective-quorum-quenchers-against-bacterial-communication
#14
Subramaniyan S, Divyasree S, Sandhia G S
BACKGROUND: Quorum sensing or the bacterial information flow in an orchestrated manner is an essential feature of many pathogenic bacteria. Quorum quenching molecules (QQ) can inhibit the growth of such bacteria. OBJECTIVE: The purpose of this study is to evaluate the potential of plant extracts as quorum quenchers and monitor the recent patents. METHODS: Many available reports and patents are on synthetic ligand molecules or even compounds isolated from cyanobacteria (Honaucin A) and other microorganisms inhibiting quorum sensing molecules...
September 8, 2016: Recent Patents on Biotechnology
https://www.readbyqxmd.com/read/27626397/flavones-as-quorum-sensing-inhibitors-identified-by-a-newly-optimized-screening-platform-using-chromobacterium-violaceum-as-reporter-bacteria
#15
Malena E Skogman, Sonja Kanerva, Suvi Manner, Pia M Vuorela, Adyary Fallarero
Quorum sensing (QS) is the process by which bacteria produce and detect signal molecules to coordinate their collective behavior. This intercellular communication is a relevant target for anti-biofilm therapies. Here we have optimized a screening-applicable assay to search for new quorum sensing inhibitors from natural compound libraries. In this system, QS is correlated with the production of violacein, which is directly controlled by the LuxI/LuxR system in Chromobacterium violaceum ATCC 31532. The parallel use of C...
2016: Molecules: a Journal of Synthetic Chemistry and Natural Product Chemistry
https://www.readbyqxmd.com/read/27626103/slippery-liquid-infused-porous-surfaces-that-prevent-bacterial-surface-fouling-and-inhibit-virulence-phenotypes-in-surrounding-planktonic-cells
#16
Michael J Kratochvil, Michael A Welsh, Uttam Manna, Benjamín J Ortiz, Helen E Blackwell, David M Lynn
Surfaces that can both prevent bacterial biofouling and inhibit the expression of virulence phenotypes in surrounding planktonic bacteria are of interest in a broad range of contexts. Here, we report new slippery-liquid infused porous surfaces (SLIPS) that resist bacterial colonization (owing to inherent "slippery" surface character) and also attenuate virulence phenotypes in non-adherent cells by gradually releasing small-molecule quorum sensing inhibitors (QSIs). QSIs active against Pseudomonas aeruginosa can be loaded into SLIPS without loss of their slippery and antifouling properties, and imbedded agents can be released into surrounding media over hours to days depending on the structures of the loaded agent...
July 8, 2016: ACS Infectious Diseases
https://www.readbyqxmd.com/read/27559393/discovery-of-an-inhibitor-of-the-production-of-the-pseudomonas-aeruginosa-virulence-factor-pyocyanin-in-wild-type-cells
#17
Bernardas Morkunas, Balint Gal, Warren R J D Galloway, James T Hodgkinson, Brett M Ibbeson, Yaw Sing Tan, Martin Welch, David R Spring
Pyocyanin is a small molecule produced by Pseudomonas aeruginosa that plays a crucial role in the pathogenesis of infections by this notorious opportunistic pathogen. The inhibition of pyocyanin production has been identified as an attractive antivirulence strategy for the treatment of P. aeruginosa infections. Herein, we report the discovery of an inhibitor of pyocyanin production in cultures of wild-type P. aeruginosa which is based around a 4-alkylquinolin-2(1H)-one scaffold. To the best of our knowledge, this is the first reported example of pyocyanin inhibition by a compound based around this molecular framework...
2016: Beilstein Journal of Organic Chemistry
https://www.readbyqxmd.com/read/27539815/an-insight-into-anti-biofilm-and-anti-quorum-sensing-activities-of-the-selected-anthocyanidins-the-case-study-of-pseudomonas-aeruginosa-pao1
#18
Boris Pejin, Ana Ciric, Jasmina Dimitric Markovic, Jasmina Glamoclija, Milos Nikolic, Marina Sokovic
Anti-biofilm activity of three anthocyanidins (pelargonidin, cyanidin and delphinidin) was evaluated for the first time at in vitro conditions. All the compounds reduced the formation of Pseudomonas aeruginosa PAO1 biofilm at low sub-MIC (0.125 MIC) with delphinidin (c 56.25 μg/mL) being the most active (43%). In comparison, ampicillin (c 93.75 μg/mL) and streptomycin (c 21.25 μg/mL) (used as positive controls) were considerably less effective at the same sub-MIC (8 and 12%, respectively). Furthermore, at 0...
August 19, 2016: Natural Product Research
https://www.readbyqxmd.com/read/27503003/cranberry-derived-proanthocyanidins-impair-virulence-and-inhibit-quorum-sensing-of-pseudomonas-aeruginosa
#19
Vimal B Maisuria, Yossef Lopez-de Los Santos, Nathalie Tufenkji, Eric Déziel
Bacteria have evolved multiple strategies for causing infections that include producing virulence factors, undertaking motility, developing biofilms, and invading host cells. N-acylhomoserine lactone (AHL)-mediated quorum sensing (QS) tightly regulates the expression of multiple virulence factors in the opportunistic pathogenic bacterium Pseudomonas aeruginosa. Thus, inhibiting QS could lead to health benefits. In this study, we demonstrate an anti-virulence activity of a cranberry extract rich in proanthocyanidins (cerPAC) against P...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27498852/control-of-quorum-sensing-and-virulence-factors-of-pseudomonas-aeruginosa-using-phenylalanine-arginyl-%C3%AE-naphthylamide
#20
Soha El-Shaer, Mona Shaaban, Rasha Barwa, Ramadan Hassan
The spread of multidrug-resistant Pseudomonas aeruginosa isolates constitutes a serious clinical challenge. Bacterial efflux machinery is a crucial mechanism of resistance among P. aeruginosa. Efflux inhibitors such as phenylalanine arginyl β-naphthylamide (PAβN) promote the bacterial susceptibility to antimicrobial agents. The pathogenesis of P. aeruginosa is coordinated via quorum sensing (QS). This study aims to find out the impact of efflux pump inhibitor, PAβN, on QS and virulence attributes in clinical isolates of P...
October 2016: Journal of Medical Microbiology
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