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Quorum sensing inhibition, Pseudomonas aeruginosa

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https://www.readbyqxmd.com/read/29135250/structure-activity-relationships-of-6-and-8-gingerol-analogs-as-anti-biofilm-agents
#1
Hyunsuk Choi, So-Young Ham, Eunji Cha, Yujin Shin, Han-Shin Kim, Jeong Kyu Bang, Sang-Hyun Son, Hee-Deung Park, Youngjoo Byun
Pseudomonas aeruginosa is a causative agent of chronic infections in immunocompromised patients. Disruption of quorum sensing circuits is an attractive strategy for treating diseases associated with P. aeruginosa infection. In this study, we designed and synthesized a series of gingerol analogs targeting LasR, a master regulator of quorum sensing networks in P. aeruginosa. Structure-activity relationship studies showed that a hydrogen-bonding interaction in the head section, stereochemistry and rotational rigidity in the middle section, and optimal alkyl chain length in the tail section are important factors for the enhancement of LasR-binding affinity and for the inhibition of biofilm formation...
November 14, 2017: Journal of Medicinal Chemistry
https://www.readbyqxmd.com/read/29130180/qualitative-and-quantitative-determination-of-quorum-sensing-inhibition-in-vitro
#2
Tim Holm Jakobsen, Maria Alhede, Louise Dahl Hultqvist, Thomas Bjarnsholt, Michael Givskov
The formation of biofilms in conjunction with quorum sensing (QS) regulated expression of virulence by opportunistic pathogens contributes significantly to immune evasion and tolerance to a variety of antimicrobial treatments. The present protocol describes methods to determine the in vitro efficacy of potential QS inhibitors (QSIs). Work on Pseudomonas aeruginosa has shown that chemical blockage of QS is a promising new antimicrobial strategy. Several live bacterial reporter systems have been developed to screen extracts and pure compounds for QSI activity...
2018: Methods in Molecular Biology
https://www.readbyqxmd.com/read/29129053/research-on-chemical-composition-and-biological-properties-including-anti-quorum-sensing-activity-of-angelica-pancicii-vandas-aerial-parts-and-roots
#3
Ksenija S Mileski, Snežana S Trifunović, Ana D Ćirić, Željana M Šakić, Mihailo S Ristić, Nina M Todorović, Vlado S Matevski, Petar D Marin, Vele V Tesevic, Ana M Džamić
The essential oil, different extracts and isolated compounds of Angelica pancicii Vandas (Apiaceae) were investigated for the first time. The GC-FID and GC-MS analyses revealed sesquiterpenoids as the main constituents of A. pancicii essential oil of aerial parts with bornyl acetate (8.08%), n-octanol (5.82%), kessane (4.26%) and β-selinene (4.26%) as the main constituents. Analysis of methanol extracts, using HPLC-DAD/ESI-ToF-MS system, showed a total of 52 compounds in the aerial parts and 53 in the roots, indicated coumarins as the main constituents...
November 11, 2017: Journal of Agricultural and Food Chemistry
https://www.readbyqxmd.com/read/29104645/combined-effect-of-linolenic-acid-and-tobramycin-on-pseudomonas-aeruginosa-biofilm-formation-and-quorum-sensing
#4
Warren Chanda, Thomson Patrick Joseph, Arshad Ahmed Padhiar, Xuefang Guo, Liu Min, Wendong Wang, Sainyugu Lolokote, Anhong Ning, Jing Cao, Min Huang, Mintao Zhong
Pseudomonas aeruginosa is a ubiquitous Gram negative opportunistic pathogen capable of causing severe nosocomial infections in humans, and tobramycin is currently used to treat P. aeruginosa associated lung infections. Quorum sensing regulates biofilm formation which allows the bacterium to result in fatal infections forcing clinicians to extensively use antibiotics to manage its infections leading to emerging multiple drug resistant strains. As a result, tobramycin is also becoming resistant. Despite extensive studies on drug discovery to alleviate microbial drug resistance, the continued microbial evolution has forced researchers to focus on screening various phytochemicals and dietary compounds for antimicrobial potential...
November 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/29098138/antiquorum-sensing-activity-of-silver-nanoparticles-in-p-aeruginosa-an-in-silico-study
#5
Syed Ghazanfar Ali, Mohammad Azam Ansari, Qazi Mohd Sajid Jamal, Haris M Khan, Mohammad Jalal, Hilal Ahmad, Abbas Ali Mahdi
Pseudomonas aeruginosa an opportunistic pathogen regulates its virulence through Quorum sensing (QS) mechanism comprising of Las and Rhl system. Targeting of QS mechanism could be an ideal strategy to combat infection caused by P. aeruginosa. Silver nanoparticles (AgNPs) have been broadly applied as antimicrobial agents against a number of pathogenic bacterial and fungal strains, but have not been reported as an anti-QS agent. Therefore, the aim of present work was to show the computational analysis for the interaction of AgNPs with the QS system using an In silico approach...
2017: In Silico Pharmacology
https://www.readbyqxmd.com/read/29042302/attenuation-of-pseudomonas-aeruginosa-quorum-sensing-virulence-and-biofilm-formation-by-extracts-of-andrographis-paniculata
#6
Malabika Banerjee, Soumitra Moulick, Kunal Kumar Bhattacharya, Debaprasad Parai, Subrata Chattopadhyay, Samir Kumar Mukherjee
Quorum-sensing (QS) is known to play an essential role in regulation of virulence factors and toxins during Pseudomonas aeruginosa infection which may frequently cause antibiotic resistance and hostile outcomes of inflammatory injury. Therefore, it is an urgent need to search for a novel agent with low risk of resistance development that can target QS and inflammatory damage prevention as well. Andrographis paniculata, a herbaceous plant under the family Acanthaceae, native to Asian countries and also cultivated in Scandinavia and some parts of Europe, has a strong traditional usage with its known antibacterial, anti-inflammatory, antipyretic, antiviral and antioxidant properties...
October 14, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/29038255/studies-of-pseudomonas-aeruginosa-mutants-indicate-pyoverdine-as-the-central-factor-in-inhibition-of-aspergillus-fumigatus-biofilm
#7
Gabriele Sass, Hasan Nazik, John Penner, Hemi Shah, Shajia Rahman Ansari, Karl V Clemons, Marie-Christine Groleau, Anna-Maria Dietl, Paolo Visca, Hubertus Haas, Eric Déziel, David A Stevens
Pseudomonas aeruginosa (Pa) and Aspergillus fumigatus (Af) are common opportunistic bacterial and fungal pathogens, respectively. They often co-exist in airways of immunocompromised patients and individuals with cystic fibrosis, where they form biofilms and cause acute and chronic illnesses. Hence the interactions between them have long been of interest, and it is known that Pa can inhibit Af in vitro We have approached the definition of the inhibitory Pa molecules by studying 24 Pa mutants, with various virulence genes deleted, for their ability to inhibit Af biofilms...
October 16, 2017: Journal of Bacteriology
https://www.readbyqxmd.com/read/28993916/antimicrobial-metabolites-from-saraca-asoca-impairs-the-membrane-transport-system-and-quorum-sensing-system-in-pseudomonas-aeruginosa
#8
Preeti Jain, Amit Nale, Rajesh Dabur
This study was conducted to explore the antimicrobial mechanism of metabolites from Saraca asoca (SA1) using differential proteomics and metabolic profile of Pseudomonas aeruginosa after treatment with effective sub-MIC dose of 312 µg/mL. SA1 fraction was found to contain antibacterial metabolites catechol, protocatechuic acid, and epigallocatechin gallate. Proteome analysis revealed 33 differentially expressed proteins after SA1 treatment. Protein network analysis showed that SA1 treatment upregulated the DNA topological and metabolic processes...
October 9, 2017: Archives of Microbiology
https://www.readbyqxmd.com/read/28993333/antibiotics-promote-escherichia-coli-pseudomonas-aeruginosa-conjugation-through-inhibiting-quorum-sensing
#9
Yang Lu, Jianming Zeng, Linjing Wang, Kai Lan, E Shunmei, Lina Wang, Qian Xiao, Qiang Luo, Xianzhang Huang, Bin Huang, Cha Chen
The effect of antibiotics on horizontal gene transfer is controversial and the underlying mechanism remains poorly understood. Here, using E. coli SM10λπ which carries a chromosomally integrated RP4 plasmid as donor strain, we investigated the effect of antibiotics on conjugational transfer of a mobilizable gentamicin (Gm) resistance plasmid. The results showed that exposure to gentamicin that may restrict the survival of recipient cells significantly enhanced SM10λπ-P. aeruginosa (PAO1) conjugation, which was attenuated by deficiency of lasI/rhlI, genes associated with generation of the quorum sensing signals N-acyl homoserine lactones (AHLs) in PAO1, or deletion of the AHLs receptor SdiA in SM10λπ...
October 9, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28983655/mechanistic-understanding-of-phenyllactic-acid-mediated-inhibition-of-quorum-sensing-and-biofilm-development-in-pseudomonas-aeruginosa
#10
Maitrayee Chatterjee, Sharon D'Morris, Vinod Paul, Sruthi Warrier, Anil Kumar Vasudevan, Muralidharan Vanuopadath, Sudarslal Sadasivan Nair, Bindhu Paul-Prasanth, C Gopi Mohan, Raja Biswas
Pseudomonas aeruginosa depends on its quorum sensing (QS) system for its virulence factors' production and biofilm formation. Biofilms of P. aeruginosa on the surface of indwelling catheters are often resistant to antibiotic therapy. Alternative approaches that employ QS inhibitors alone or in combination with antibiotics are being developed to tackle P. aeruginosa infections. Here, we have studied the mechanism of action of 3-Phenyllactic acid (PLA), a QS inhibitory compound produced by Lactobacillus species, against P...
October 5, 2017: Applied Microbiology and Biotechnology
https://www.readbyqxmd.com/read/28939255/inhibition-of-quorum-sensing-related-virulence-factors-of-pseudomonas-aeruginosa-by-pyridoxal-lactohydrazone
#11
Azam Heidari, Nader Noshiranzadeh, Fakhri Haghi, Rahman Bikas
Pseudomonas aeruginosa quorum sensing (QS) system is a cell to cell signaling mechanism that regulates virulence factors and pathogenicity. Therefore, the QS system in P. aeruginosa may be an important target for pharmacological intervention. The present study aimed to investigate the effects of sub-MIC concentrations of (S,E)-2-hydroxy-N-(3-hydroxy-5-(hydroxymethyl)-2-methylpyridin-4-yl)propane hydrazide (pyridoxal lactohydrazone) against P. aeruginosa QS related virulence factors. We investigated the effect of sub-MIC concentrations of chiral pyridoxal lactohydrazone, which formed by the reaction of chiral lactic acid hydrazide and pyridoxal (one form of Vitamin B6) as bioactive reagents, on virulence factors...
September 20, 2017: Microbial Pathogenesis
https://www.readbyqxmd.com/read/28930136/methanol-extract-from-anogeissus-leiocarpus-dc-guill-et-perr-combretaceae-stem-bark-quenches-the-quorum-sensing-of-pseudomonas-aeruginosa-pao1
#12
Vincent Ouedraogo, Martin Kiendrebeogo
Background: Due to its extensive arsenal of virulence factors and inherent resistance to antibiotics, Pseudomonas aeruginosa is a threat particularly in immunocompromised patients. Considering the central role of quorum sensing in the production of virulence factors, inhibition of bacterial communication mechanism constitute an opportunity to attenuate pathogenicity of bacteria resistant to available antibiotics. Our study aimed to assess the anti-quorum sensing activity of Anogeissus leiocarpus, traditionally used in Burkina Faso, for the treatment of infected burn wounds...
October 6, 2016: Medicines (Basel, Switzerland)
https://www.readbyqxmd.com/read/28928721/onion-peel-ethylacetate-fraction-and-its-derived-constituent-quercetin-4-o-%C3%AE-d-glucopyranoside-attenuates-quorum-sensing-regulated-virulence-and-biofilm-formation
#13
Hanan M Al-Yousef, Atallah F Ahmed, Nasser A Al-Shabib, Sameen Laeeq, Rais A Khan, Md T Rehman, Ali Alsalme, Mohamed F Al-Ajmi, Mohammad S Khan, Fohad M Husain
The resistance and pathogenesis of bacteria could be related to their ability to sense and respond to population density, termed quorum sensing (QS). Inhibition of the QS system is considered as a novel strategy for the development of antipathogenic agents, especially for combating drug-resistant bacterial infections. In the present study, the anti-QS activity of Onion peel ethylacetate fraction (ONE) was tested against Chromobacterium violaceum CV12472 and Pseudomonas aeruginosa PAO1. ONE inhibit the QS-mediated virulence factors production such as violacein in C...
2017: Frontiers in Microbiology
https://www.readbyqxmd.com/read/28923875/pharmacological-inhibition-of-the-pseudomonas-aeruginosa-mvfr-quorum-sensing-system-interferes-with-biofilm-formation-and-potentiates-antibiotic-mediated-biofilm-disruption
#14
Damien Maura, Laurence G Rahme
Pseudomonas aeruginosa biofilms contribute to its survival on biotic and abiotic surfaces and represent a major clinical threat due to their high tolerance to antibiotics. Therefore, the discovery of anti-biofilm agents may hold great promise. We show that pharmacological inhibition of the P. aeruginosa quorum sensing regulator MvfR (PqsR) using a benzamide-benzimidazole compound interferes with biofilm formation and potentiates biofilm sensitivity to antibiotics. Such a strategy could have a great potential against P...
September 18, 2017: Antimicrobial Agents and Chemotherapy
https://www.readbyqxmd.com/read/28904418/leaf-extracts-of-selected-gardening-trees-can-attenuate-quorum-sensing-and-pathogenicity-of-pseudomonas-aeruginosa-pao1
#15
Kaimin Niu, Min Kuk, Haein Jung, Kokgan Chan, Sooki Kim
An increasing concern on resistance to multiple-antibiotics has led to the discovery of novel agents and the establishment of new precaution strategy. Numerous plant sources have been widely studied to reduce virulence of pathogenic bacteria by interfering cell-to-cell based communication called quorum sensing (QS). Leaf extracts of 17 gardening trees were collected and investigated for their anti-QS effects using a sensor strain Chromobacterium violaceum CV026. Methanolic extracts of K4 (Acer palmatum), K9 (Acer pseudosieboldianum) and K13 (Cercis chinensis) leaves were selected for further experiments based on their antagonism effect on QS without inhibiting C...
September 2017: Indian Journal of Microbiology
https://www.readbyqxmd.com/read/28900249/effect-of-efflux-pump-inhibition-on-pseudomonas-aeruginosa-transcriptome-and-virulence
#16
Giordano Rampioni, Cejoice Ramachandran Pillai, Francesca Longo, Roslen Bondì, Valerio Baldelli, Marco Messina, Francesco Imperi, Paolo Visca, Livia Leoni
Efflux pumps of the resistance-nodulation-cell-division (RND) family increase antibiotic resistance in many bacterial pathogens, representing candidate targets for the development of antibiotic adjuvants. RND pumps have also been proposed to contribute to bacterial infection, implying that efflux pump inhibitors (EPIs) could also act as anti-virulence drugs. Nevertheless, EPIs are usually investigated only for their properties as antibiotic adjuvants, while their potential anti-virulence activity is seldom taken into account...
September 12, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28860065/chitosan-extracted-from-aspergillus-flavus-shows-synergistic-effect-eases-quorum-sensing-mediated-virulence-factors-and-biofilm-against-nosocomial-pathogen-pseudomonas-aeruginosa
#17
Sahira Nsayef Muslim, Israa M S Al Kadmy, Alaa Naseer Mohammed Ali, Batool Kadham Salman, Mohammad Ahmad, Saba Saadoon Khazaal, Nadheema Hammood Hussein, Sraa Nsayef Muslim
The biological methods for extraction of chitosan were used as alternative procedures for chemical methods In biological methods, the chitosan was extracted from A. flavus by using of Lactobacillus paracasei for demineralization and Bacillus subtilis for deproteinization. The yield of extracted chitosan reached to 53.8%, pH was 7.8 and complete solubility in 1% acitic acid. Purified chitosan had the ability to reduce the biofilm forming capacity of P. aeruginosa clearly visible in light microscopic staining and scanning electron microscopy...
August 28, 2017: International Journal of Biological Macromolecules
https://www.readbyqxmd.com/read/28851971/a-broad-range-quorum-sensing-inhibitor-working-through-srna-inhibition
#18
Tim H Jakobsen, Anders N Warming, Rebecca M Vejborg, Joana A Moscoso, Marc Stegger, Frederik Lorenzen, Morten Rybtke, Jens B Andersen, Rico Petersen, Paal Skytt Andersen, Thomas E Nielsen, Tim Tolker-Nielsen, Alain Filloux, Hanne Ingmer, Michael Givskov
For the last decade, chemical control of bacterial virulence has received considerable attention. Ajoene, a sulfur-rich molecule from garlic has been shown to reduce expression of key quorum sensing regulated virulence factors in the opportunistic pathogen Pseudomonas aeruginosa. Here we show that the repressing effect of ajoene on quorum sensing occurs by inhibition of small regulatory RNAs (sRNA) in P. aeruginosa as well as in Staphylococcus aureus, another important human pathogen that employs quorum sensing to control virulence gene expression...
August 29, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28829573/chemical-interrogation-of-luxr-type-quorum-sensing-receptors-reveals-new-insights-into-receptor-selectivity-and-the-potential-for-interspecies-bacterial-signaling
#19
Joseph P Gerdt, Danielle M Wittenwyler, Joshua B Combs, Michelle E Boursier, Jacob W Brummond, He Xu, Helen E Blackwell
Cell-cell signaling between bacteria, including quorum-sensing (QS) communication systems, may play a role in the establishment and maintenance of polymicrobial communities. To better understand and model these interactions, we must uncover the degree to which neighboring species recognize each another's signals. In the current study, we tested the likelihood of whether the QS systems of two opportunistic pathogens (Acinetobacter baumannii and Pseudomonas aeruginosa) that frequently arise in polymicrobial infections would be affected by the QS signals of neighboring species...
September 15, 2017: ACS Chemical Biology
https://www.readbyqxmd.com/read/28818490/inhibition-of-quorum-sensing-controlled-biofilm-formation-in-pseudomonas-aeruginosa-by-quorum-sensing-inhibitors
#20
Ellappan Kalaiarasan, Kottha Thirumalaswamy, Belgode Narasimha Harish, Vasuki Gnanasambandam, Veeresh Kumar Sali, James John
Antimicrobial therapy against extensively drug-resistant (XDR) P. aeruginosa biofilms is less efficient compared to the treatment of equal bacterial counts of free-floating planktonic cells, which has become a serious threat in hospital environment. P. aeruginosa regulate their cooperative activities and physiological processes through a cell to cell chemical communication process called Quorum sensing (QS). This attracted our interest to synthesize, and to chemically characterize two anti-QS compounds, N-(4-{4-fluoroanilno} butanoyl) -l-homoserine lactone (FABHL) and N-(4-{4-chlororoanilno} butanoyl) -l-homoserine lactone (CABHL) to inhibit biofilm formation via disabling the QS circuits...
October 2017: Microbial Pathogenesis
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