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Redfern J, Enright MC. Further understanding of Pseudomonas aeruginosa’s ability to horizontally acquire virulence: possible intervention strategies. Expert Rev Anti Infect Ther 2020; 18:539-549. [DOI: 10.1080/14787210.2020.1751610] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- James Redfern
- Department of Natural Sciences, Manchester Metropolitan University, Manchester, UK
| | - Mark C. Enright
- Department of Life Sciences, Manchester Metropolitan University, Manchester, UK
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102
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Abbas HA, Hegazy WAH. Repurposing anti-diabetic drug "Sitagliptin" as a novel virulence attenuating agent in Serratia marcescens. PLoS One 2020; 15:e0231625. [PMID: 32298346 PMCID: PMC7162429 DOI: 10.1371/journal.pone.0231625] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2019] [Accepted: 03/26/2020] [Indexed: 12/13/2022] Open
Abstract
Background Serratia marcescens is an emerging pathogen that causes a variety of health care associated infections. S. marcescens is equipped with an arsenal of virulence factors such as biofilm formation, swimming and swarming motilities, prodigiosin, protease and others which enable it to initiate and cause the infection. These virulence factors are orchestrated under the umbrella of an intercellular communication system named Quorum sensing (QS). QS allows bacterial population to synchronize the expression of virulence genes upon detection of a chemical signaling molecule. Targeting bacterial virulence is a promising approach to attenuate bacteria and enhances the ability of immune system to eradicate the bacterial infection. Drug repurposing is an advantageous strategy that confers new applications for drugs outside the scope of their original medical use. This promising strategy offers the use of safe approved compounds, which potentially lowers the costs and shortens the time than that needed for development of new drugs. Sitagliptin is dipeptidyl peptidase-4 (DPP-4) inhibitor, is used to treat diabetes mellitus type II as it increases the production of insulin and decreasing the production of glucagon by the pancreas. We aimed in this study to repurpose sitagliptin, investigating the anti-virulence activities of sitagliptin on S. marcescens. Methods The effect of sub-inhibitory concentrations of sitagliptin on virulence factors; protease, prodigiosin, biofilm formation, swimming and swarming motilities was estimated phenotypically. The qRT-PCR was used to show the effect of sitagliptin on the expression of QS-regulated virulence genes. The in-vivo protective activity of sitagliptin on S. marcescens pathogenesis was evaluated on mice. Results Sitagliptin (1 mg/ml) significantly reduced the biofilm formation, swimming and swarming motilities, prodigiosin and protease. The qRT-PCR confirmed the effect on virulence as shown by down regulating the expression of fimA, fimC, flhC, flhD, bsmB, rssB, rsmA, pigP, and shlA genes. Moreover, the in-vivo findings showed the efficient ability of sitagliptin to weaken S. marcescens pathogenesis. Conclusion Sitagliptin is a promising anti-virulence agent against S. marcescens that may be beneficial in the control of healthcare associated infections caused by S. marcescens.
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Affiliation(s)
- Hisham A. Abbas
- Department of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
| | - Wael A. H. Hegazy
- Department of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Zagazig, Egypt
- * E-mail:
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103
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Zhong L, Ravichandran V, Zhang N, Wang H, Bian X, Zhang Y, Li A. Attenuation of Pseudomonas aeruginosa Quorum Sensing by Natural Products: Virtual Screening, Evaluation and Biomolecular Interactions. Int J Mol Sci 2020; 21:E2190. [PMID: 32235775 PMCID: PMC7140002 DOI: 10.3390/ijms21062190] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2020] [Revised: 03/10/2020] [Accepted: 03/17/2020] [Indexed: 02/07/2023] Open
Abstract
Natural products play vital roles against infectious diseases since ancient times and most drugs in use today are derived from natural sources. Worldwide, multi-drug resistance becomes a massive threat to the society with increasing mortality. Hence, it is very crucial to identify alternate strategies to control these 'super bugs'. Pseudomonas aeruginosa is an opportunistic pathogen reported to be resistant to a large number of critically important antibiotics. Quorum sensing (QS) is a cell-cell communication mechanism, regulates the biofilm formation and virulence factors that endow pathogenesis in various bacteria including P. aeruginosa. In this study, we identified and evaluated quorum sensing inhibitors (QSIs) from plant-based natural products against P. aeruginosa. In silico studies revealed that catechin-7-xyloside (C7X), sappanol and butein were capable of interacting with LasR, a LuxR-type quorum sensing regulator of P. aeruginosa. In vitro assays suggested that these QSIs significantly reduced the biofilm formation, pyocyanin, elastase, and rhamnolipid without influencing the growth. Especially, butein reduced the biofilm formation up to 72.45% at 100 µM concentration while C7X and sappanol inhibited the biofilm up to 66% and 54.26% respectively. Microscale thermophoresis analysis revealed that C7X had potential interaction with LasR (KD = 933±369 nM) and thermal shift assay further confirmed the biomolecular interactions. These results suggested that QSIs are able to substantially obstruct the P. aeruginosa QS. Since LuxR-type transcriptional regulator homologues are present in numerous bacterial species, these QSIs may be developed as broad spectrum anti-infectives in the future.
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Affiliation(s)
- Lin Zhong
- Helmholtz International Laboratory for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Vinothkannan Ravichandran
- Helmholtz International Laboratory for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Na Zhang
- Helmholtz International Laboratory for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Hailong Wang
- Helmholtz International Laboratory for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Xiaoying Bian
- Helmholtz International Laboratory for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Youming Zhang
- Helmholtz International Laboratory for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
| | - Aiying Li
- Helmholtz International Laboratory for Anti-Infectives, Shandong University-Helmholtz Institute of Biotechnology, State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266237, China
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104
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Zhang D, Gan RY, Zhang JR, Farha AK, Li HB, Zhu F, Wang XH, Corke H. Antivirulence properties and related mechanisms of spice essential oils: A comprehensive review. Compr Rev Food Sci Food Saf 2020; 19:1018-1055. [PMID: 33331691 DOI: 10.1111/1541-4337.12549] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/09/2019] [Revised: 01/09/2020] [Accepted: 01/30/2020] [Indexed: 12/19/2022]
Abstract
In recent decades, reduced antimicrobial effectiveness, increased bacterial infection, and newly emerged microbial resistance have become global public issues, leading to an urgent need to find effective strategies to counteract these problems. Strategies targeting bacterial virulence factors rather than bacterial survival have attracted increasing interest, since the modulation of virulence factors may prevent the development of drug resistance in bacteria. Spices are promising natural sources of antivirulence compounds owing to their wide availability, diverse antivirulence phytochemical constituents, and generally favorable safety profiles. Essential oils are the predominant and most important antivirulence components of spices. This review addresses the recent efforts of using spice essential oils to inhibit main bacterial virulence traits, including the quorum sensing system, biofilm formation, motility, and toxin production, with an intensive discussion of related mechanisms. We hope that this review can provide a better understanding of the antivirulence properties of spice essential oils, which have the potential to be used as antibiotic alternatives by targeting bacterial virulence.
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Affiliation(s)
- Dan Zhang
- Department of Food Science & Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Ren-You Gan
- Department of Food Science & Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China.,Research Center for Plants and Human Health, Institute of Urban Agriculture, Chinese Academy of Agricultural Sciences, Chengdu, China
| | - Jia-Rong Zhang
- Department of Food Science & Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Arakkaveettil Kabeer Farha
- Department of Food Science & Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
| | - Hua-Bin Li
- Guangdong Provincial Key Laboratory of Food, Nutrition and Health, Department of Nutrition, School of Public Health, Sun Yat-Sen University, Guangzhou, China
| | - Fan Zhu
- School of Chemical Sciences, University of Auckland, Auckland, New Zealand
| | - Xiao-Hong Wang
- College of Food Science and Technology, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Harold Corke
- Department of Food Science & Technology, School of Agriculture and Biology, Shanghai Jiao Tong University, Shanghai, China
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105
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Kassinger SJ, van Hoek ML. Biofilm architecture: An emerging synthetic biology target. Synth Syst Biotechnol 2020; 5:1-10. [PMID: 31956705 PMCID: PMC6961760 DOI: 10.1016/j.synbio.2020.01.001] [Citation(s) in RCA: 52] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 12/29/2019] [Accepted: 01/07/2020] [Indexed: 02/07/2023] Open
Abstract
Synthetic biologists are exploiting biofilms as an effective mechanism for producing various outputs. Metabolic optimization has become commonplace as a method of maximizing system output. In addition to production pathways, the biofilm itself contributes to the efficacy of production. The purpose of this review is to highlight opportunities that might be leveraged to further enhance production in preexisting biofilm production systems. These opportunities may be used with previously established production systems as a method of improving system efficiency further. This may be accomplished through the reduction in the cost of establishing and maintaining biofilms, and maintenance of the enhancement of product yield per unit of time, per unit of area, or per unit of required input.
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Affiliation(s)
| | - Monique L. van Hoek
- George Mason University, School of Systems Biology, George Mason University, 10920 George Mason Circle, Manassas, VA, 20110, USA
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106
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Abstract
Pseudomonas aeruginosa, a versatile Gram-negative pathogen that can cause a wide range of infections, is the most common causative agent in cases of bacterial keratitis associated with contact-lens use. Corneal infections with P. aeruginosa often have poor clinical outcomes and can result in long and costly treatments. During the infection process, the pathogen exploits its large genome, encoding complex regulatory networks and a wide range of virulence factors, including motility and the secretion of various proteases and toxins. Although antibiotic resistance levels in the UK are low, higher levels have been seen in some other countries. In the face of increasing antibiotic resistance, alternative therapeutic approaches such as antivirulence strategies and phage therapy are being developed. There is increasing evidence to suggest that keratitis infections are associated with a phylogenetic subgroup of P. aeruginosa isolates carrying the gene encoding the potent cytotoxin exotoxin U, one of two mutually exclusive exotoxins secreted via the type III secretion system. The mechanisms behind this association are unclear, but understanding the genetic differences that predispose P. aeruginosa to cause corneal infections may allow for the development of targeted and more effective future treatments to reduce the morbidity of P. aeruginosa keratitis. In order to minimize the risk of severe P. aeruginosa eye infections, a wide range of contact-lens disinfection solutions are available. Constant exposure to biocides at a range of concentrations, from sub-inhibitory to inhibitory, could contribute to the development of resistance to both antibiotics and disinfectants.
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Affiliation(s)
- Yasmin Hilliam
- Department of Clinical Infection, Microbiology, and Immunology, Institute of Infection and Global Health, University of Liverpool, Liverpool, L69 7BE, UK
| | - Stephen Kaye
- Department of Eye and Vision Science, Institute of Ageing and Chronic Disease, University of Liverpool, Liverpool, L7 8TX, UK
| | - Craig Winstanley
- Department of Clinical Infection, Microbiology, and Immunology, Institute of Infection and Global Health, University of Liverpool, Liverpool, L69 7BE, UK
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107
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Wei Q, Bhasme P, Wang Z, Wang L, Wang S, Zeng Y, Wang Y, Ma LZ, Li Y. Chinese medicinal herb extract inhibits PQS-mediated quorum sensing system in Pseudomonas aeruginosa. JOURNAL OF ETHNOPHARMACOLOGY 2020; 248:112272. [PMID: 31586695 DOI: 10.1016/j.jep.2019.112272] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 09/24/2019] [Accepted: 10/02/2019] [Indexed: 06/10/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Chinese medicinal herbs have long been recognized as important resources that can be used for the struggle against diseases and a significant component of health care system for thousands of years. AIM OF THE STUDY In order to understand their roles in the treatment against bacterial infections, we examined the underlying mechanisms of one of the medicinal herb extracts (MHE) (Artemisiae argyi Folium, the root bark of Cortex dictamni and the root of Solanum melongena) on the human opportunistic pathogen Pseudomonas aeruginosa. MATERIALS AND METHODS We combined phenotypic assays, transcriptional analysis and chemical investigations to identify the mechanisms underlying MHE inhibition. The standard sample was prepared and transcriptional reporters for quorum sensing systems were constructed. Electrophoretic mobility shift assays were used to clarify the mechanism. GC-MS and molecular docking were used to identify the chemicals in MHE and potential binding agents. RESULTS We found that co-culturing of MHE with bacterial cells did not change the growth rate but substantially attenuate the production of virulence factors such as phenazine pyocyanin, siderophore pyoverdine and biofilm formation. Transcriptional responses of three major quorum sensing (QS) systems of P. aeruginosa to MHE showed that Pseudomonas quinolone signaling (PQS) system was completely repressed, rhlR/rhlI QS system was moderately inhibited, while lasR/lasI QS system was only slightly affected, suggesting that MHE might selectively target the PQS system to inhibit bacterial virulence. Furthermore, electrophoretic mobility shift assays (EMSA) showed that MHE inhibited the binding of MvfR the corresponding pqsA promoter region, suggesting that MHE serves as a competitive agent to quench the QS functionality in P. aeruginosa. CONCLUSION We prove that MHE functions as an effective countermeasure against bacterial infections.
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Affiliation(s)
- Qing Wei
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China; State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, China
| | - Pramod Bhasme
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China; University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Zhiguo Wang
- The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences/Guizhou Provincial Engineering Research Center for Natural Drugs, Guiyang, Guizhou, 550014, China; Pneumology Department of Yanan University Affiliated Hospital, Yanan, Shannxi, 716000, China
| | - Li Wang
- Clinical Laboratory of Yanan University Affiliated Hospital, Yanan, Shannxi, 716000, China
| | - Shiwei Wang
- Key Laboratory of Resources Biology and Biotechnology in Western China, Ministry of Education, College of Life Science, Northwest University, Xi'an, Shaanxi, 710069, China
| | - Yunfei Zeng
- Yanan Institute of Traditional Chinese Medicine, Yanan, Shaanxi, 716000, China
| | - Yi Wang
- Experimental Research Center, China Academy of Chinese Medical Sciences, Beijing, 100700, China
| | - Luyan Z Ma
- State Key Laboratory of Microbial Resources, Institute of Microbiology, Chinese Academy of Sciences, Beijing, 100101, China
| | - Yan Li
- State Key Laboratory of Functions and Applications of Medicinal Plants, Guizhou Medical University, Guiyang, Guizhou, 550014, China; The Key Laboratory of Chemistry for Natural Products of Guizhou Province and Chinese Academy of Sciences/Guizhou Provincial Engineering Research Center for Natural Drugs, Guiyang, Guizhou, 550014, China.
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108
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Jayaprada T, Hu J, Zhang Y, Feng H, Shen D, Geekiyanage S, Yao Y, Wang M. The interference of nonylphenol with bacterial cell-to-cell communication. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 257:113352. [PMID: 31672371 DOI: 10.1016/j.envpol.2019.113352] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Revised: 10/04/2019] [Accepted: 10/04/2019] [Indexed: 06/10/2023]
Abstract
The interference of nonylphenol (NP) with humans and animals, especially in hormone systems, has been well-studied. There is rarely any record of its effect on bacteria, which dominate in various environments. In our study, we employed Pseudomonas aeruginosa PAO1 as a model microorganism and took its common lifestyle biofilm, mainly regulated by quorum sensing (QS), as a cut-in point to investigate the effect of NP (1, 5, 10 mg L-1) on bacteria. The results showed that more than 5 mg L-1 of NP did interfere with biofilm formation and affected bacterial QS. In detail, the LasI/R circuit, but not the RhlI/R circuit, was considerably obstructed. The decrease in lasI and lasR expression resulted in a significant reduction in N-3-oxo-dodecanoyl homoserine lactone (3OC12-HSL) signals and the downstream production of elastases. Docking results indicated the binding of NP with LasR protein, simulating the binding of 3OC12-HSL with LasR protein, which explained the obstruction of the LasIR circuit. We concluded that NP competed with 3OC12-HSL and blocked 3OC12-HSL binding with the LasR protein, resulting in a direct interference in bacterial biofilm formation. This is the first report of NP interference with bacterial signaling, which is not only helpful to understand the effect of NP on various ecosystems, but is also beneficial to enrich our knowledge of inter-kingdom communication.
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Affiliation(s)
- Thilini Jayaprada
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Jingming Hu
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Yunyun Zhang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Huajun Feng
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Dongsheng Shen
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China
| | - Sudarshanee Geekiyanage
- Department of Agricultural Biology, University of Ruhuna, Mapalana, Kamburupitiya, 81100, Sri Lanka
| | - Yanlai Yao
- Institute of Environment Resource, Soil and Fertilizer, Zhejiang Academy of Agricultural Sciences, Hangzhou 310021, China
| | - Meizhen Wang
- School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, Hangzhou 310012, China.
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109
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Mok N, Chan SY, Liu SY, Chua SL. Vanillin inhibits PqsR-mediated virulence in Pseudomonas aeruginosa. Food Funct 2020; 11:6496-6508. [DOI: 10.1039/d0fo00046a] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
Vanillin, a natural phenolic aldehyde from vanilla bean, has been reported to inhibit pqs quorum sensing in Pseudomonas aeruginosa, with potential applications in combinatorial antimicrobial therapy against biofilm infections.
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Affiliation(s)
- Nicholas Mok
- Department of Biology
- University of Waterloo
- Waterloo
- Canada
| | - Shepherd Yuen Chan
- Department of Applied Biology and Chemical Technology
- The Hong Kong Polytechnic University
- Kowloon
- China
| | - Sylvia Yang Liu
- Department of Applied Biology and Chemical Technology
- The Hong Kong Polytechnic University
- Kowloon
- China
| | - Song Lin Chua
- Department of Applied Biology and Chemical Technology
- The Hong Kong Polytechnic University
- Kowloon
- China
- State Key Laboratory of Chemical Biology and Drug Discovery
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110
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Shin DS, Eom YB. Efficacy of zerumbone against dual-species biofilms of Candida albicans and Staphylococcus aureus. Microb Pathog 2019; 137:103768. [DOI: 10.1016/j.micpath.2019.103768] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2019] [Revised: 09/16/2019] [Accepted: 09/30/2019] [Indexed: 02/06/2023]
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111
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An innovative role for tenoxicam as a quorum sensing inhibitor in Pseudomonas aeruginosa. Arch Microbiol 2019; 202:555-565. [PMID: 31732766 DOI: 10.1007/s00203-019-01771-4] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 10/30/2019] [Accepted: 11/07/2019] [Indexed: 12/14/2022]
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112
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Anti-quorum sensing and antibiofilm activities of Blastobotrys parvus PPR3 against Pseudomonas aeruginosa PAO1. Microb Pathog 2019; 138:103811. [PMID: 31644930 DOI: 10.1016/j.micpath.2019.103811] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2019] [Revised: 10/17/2019] [Accepted: 10/18/2019] [Indexed: 12/28/2022]
Abstract
The bacterial cell communication also termed as Quorum sensing (QS) system was involved in the expression of several virulence traits during Pseudomonas infection. The attenuating of this bacterial cell communication system is an attractive approach for the management of bacterial infections without the complication of resistance development. In this respect, the marine environment has gained significant attention due to its biodiversity and as a source of novel bioactive compounds. The present study aimed to screening effective QS inhibitors from marine associated fungal species for QS inhibitors. Twelve morphologically distinct fungal isolates were isolated from the wood of Avicennia marina from marine ecosystem. The anti-QS potential of fungal crude extract from was investigated in biosensor strain and test bacterium, Chromobacterium violaceum and Pseudomonas aeruginosa PAO1, respectively. Promising anti-QS activity was observed in the crude extract of one of the fungal isolate and identified by molecular characterization using internal transcribed spacer (ITS) region as Blastobotrys parvus PPR3. The anti-virulence and antibiofilm effects of ethyl acetate fractions from PPR3 against P. aeruginosa PAO1 were evaluated. The fungal metabolites responsible for the anti-QS activity of fungal crude extract was identified using gas chromatography-mass spectrometry (GC-MS). Furthermore, molecular docking studies were performed to understand the interaction of bioactive compounds with as receptors of P. aeruginosa PAO1. The crude extract of PPR3 showed reduction in different virulence traits of P. aeruginosa PAO1 such as production of pyocyanin, elastase, protease, chitinase, swimming and swarming motility, biofilm formation, exopolysaccharide production and alginate production at different sub-MIC concentrations. Interaction of bioactive metabolites with LasR and RhlR receptors of P. aeruginosa PAO1 was reported. The findings of the present study suggested that metabolites of B. parvus PPR3 interfere with QS system of P. aeruginosa PAO1 and alters the production of virulence factors.
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113
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Rajkumari J, Borkotoky S, Reddy D, Mohanty SK, Kumavath R, Murali A, Suchiang K, Busi S. Anti-quorum sensing and anti-biofilm activity of 5-hydroxymethylfurfural against Pseudomonas aeruginosa PAO1: Insights from in vitro, in vivo and in silico studies. Microbiol Res 2019; 226:19-26. [DOI: 10.1016/j.micres.2019.05.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2018] [Revised: 05/03/2019] [Accepted: 05/04/2019] [Indexed: 10/26/2022]
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114
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Ding T, Li T, Li J. Discovery of quorum sensing inhibitors of Pseudomonas fluorescens P07 by using a receptor-based pharmacophore model and virtual screening. Lebensm Wiss Technol 2019. [DOI: 10.1016/j.lwt.2019.04.030] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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115
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Ding T, Li T, Li J. Virtual screening for quorum-sensing inhibitors of Pseudomonas fluorescens P07 from a food-derived compound database. J Appl Microbiol 2019; 127:763-777. [PMID: 31125995 DOI: 10.1111/jam.14333] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2019] [Revised: 05/09/2019] [Accepted: 05/18/2019] [Indexed: 01/15/2023]
Abstract
AIMS Pseudomonas fluorescens are important psychrotrophic food spoilage bacteria that are frequently detected in dairy, meat and aquatic products. Quorum sensing (QS) is an intercellular communication and gene regulation mechanism that enables bacteria to monitor their cell densities and regulate a variety of physiological processes. Hence, targeting the bacterial QS system might be a feasible approach to improve food quality and safety by regulating the spoilage caused by P. fluorescens. METHODS AND RESULTS In this study, we screened a food-derived three-dimensional (3D) compound database to search for potential QS inhibitors (QSIs) with higher security. The 3D structures of LuxI- and LuxR-type proteins of P. fluorescens P07 were used as targets to screen for QSIs. A total of 25 compounds with high docking scores were tested for their anti-QS activities by indicator strains. The results show that 19 compounds possessed anti-QS activities. Among them, (+)-catechin had the strongest anti-QS activity. The results show that (+)-catechin significantly inhibited the production of extracellular enzymes, swimming motility, biofilm formation, acyl-homoserine lactones and extracellular polymeric substances (EPSs) of P. fluorescens P07. The inhibitory mechanism of (+)-catechin on the QS system of P. fluorescens P07 was discussed in the context of molecular docking analysis and real-time quantitative PCR (RT-qPCR). CONCLUSIONS Virtual screening was useful in finding novel QSIs with high security of P. fluorescens P07 from a food-derived 3D compound database. The high hit rate suggested that foods are rich sources of QSIs, and have great potential for exploration. SIGNIFICANCE AND IMPACT OF THE STUDY The modelled LuxI- and LuxR-type proteins could be used as targets to discover P. fluorescens P07 QSIs. (+)-catechin, (-)-epicatechin, propyl gallate, hesperidin and lycopene which were identified as potent QSIs, and may be applied in food preservation and biofilm elimination.
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Affiliation(s)
- T Ding
- School of Food Science and Technology, Jiangnan University, Wuxi, China
| | - T Li
- Key Laboratory of Biotechnology and Bioresources Utilization (Dalian Minzu University), Ministry of Education, Dalian, Liaoning, China
| | - J Li
- School of Food Science and Technology, Jiangnan University, Wuxi, China.,College of Food Science and Technology, Bohai University, Jinzhou,, Liaoning, China.,Food Safety Key Lab of Liaoning Province, National & Local Joint Engineering Research Center of Storage, Processing and Safety Control Technology for Fresh Agricultural and Aquatic Products, Jinzhou, Liaoning, China
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116
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Ma Z, Zhang R, Hai D, Lu Z, Lv F, Zhao H, Zhang C, McAllister TA, Stanford K, Bie X. Antibiofilm activity and modes of action of a novel β-sheet peptide against multidrug-resistant Salmonella enterica. Food Res Int 2019; 125:108520. [PMID: 31554137 DOI: 10.1016/j.foodres.2019.108520] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2019] [Revised: 06/13/2019] [Accepted: 06/21/2019] [Indexed: 12/21/2022]
Abstract
S. enterica is an important foodborne pathogen worldwide. As some strains can form biofilms which may offer protection against antimicrobials, it is of interest to explore ways to prevent biofilm formation by S. enterica. In this study, we engineered a short β-sheet peptide WK2 (WKWKCTKSGCKWKW-NH2) and examined its antimicrobial and anti-biofilm activities against various S. enterica strains, including the multidrug-resistant S. Typhimurium DT104. WK2 displayed bacteriostatic activity with a geometric mean (GM) minimum inhibitory concentration (MIC) of 4.17 μg/mL, and bactericidal activity, with a GM lethal concentration (LC) of 7.51 μg/mL. Crystal violet staining and fluorescence measurements demonstrated that WK2 inhibited S. Typhimurium DT104 biofilm formation at 0.5 μg/mL and killed the sessile cells in biofilms at 8 μg/mL. Real-time polymerase chain reaction (qPCR) and microscopic observation revealed that the anti-biofilm activity of WK2 likely arises through the formation of complexes with bacterial DNA, inhibition of surface organelle biosynthesis and interference with autoinducer-2 (AI-2)-mediated quorum sensing (QS). Therefore, WK2 is a promising antimicrobial agent for the prevention and control of biofilms produced by multidrug-resistant S. enterica.
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Affiliation(s)
- Zhi Ma
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Rujing Zhang
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Dan Hai
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Zhaoxin Lu
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Fengxia Lv
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Haizhen Zhao
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Chong Zhang
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China
| | - Tim A McAllister
- Agriculture and Agri-Food Canada, Lethbridge T1J 4B1, AB, Canada
| | - Kim Stanford
- Alberta Agriculture and Forestry, Lethbridge T1J 4V6, AB, Canada
| | - Xiaomei Bie
- College of Food Science and Technology, Nanjing Agricultural University, Nanjing 210095, PR China.
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Teerapo K, Roytrakul S, Sistayanarain A, Kunthalert D. A scorpion venom peptide derivative BmKn‒22 with potent antibiofilm activity against Pseudomonas aeruginosa. PLoS One 2019; 14:e0218479. [PMID: 31199859 PMCID: PMC6568410 DOI: 10.1371/journal.pone.0218479] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Accepted: 06/03/2019] [Indexed: 12/26/2022] Open
Abstract
Pseudomonas aeruginosa is a leading cause of nosocomial and serious life-threatening infections and infections caused by this bacterium continue to pose a major medical challenge worldwide. The ability of P. aeruginosa to produce multiple virulence factors and in particular to form biofilms makes this bacterium resistant to all known antibiotics. As a consequence, standard antibiotic therapy are increasingly become ineffective to clear such infections associated with biofilms. In search for novel effective agents to combat P. aeruginosa biofilm infections, a series of the BmKn‒2 scorpion venom peptide and its truncated derivatives were synthesized and their antibiofilm activities assessed. Among the peptides tested, BmKn‒22 peptide, which was a modified peptide of the parental BmKn‒2 scorpion venom peptide, clearly demonstrated the most potential inhibitory activity against P. aeruginosa biofilms without affecting the bacterial growth. This peptide was not only capable of inhibiting the formation of P. aeruginosa biofilms, but also disrupting the established biofilms of P. aeruginosa. Additionally, BmKn‒22 peptide was able to inhibit the production of key virulence factor pyocyanin of P. aeruginosa. Our results also showed that BmKn‒22 peptide significantly reduced lasI and rhlR expression, and suggested that BmKn‒22 peptide-mediated inhibition of P. aeruginosa biofilms and virulence factors was achieved through the components of quorum-sensing systems. Combination of BmKn‒22 peptide with azithromycin resulted in a remarkable reduction P. aeruginosa biofilms. Since this peptide exhibited low toxicity to mammalian cells, all our results therefore indicate that the BmKn‒22 peptide is a promising antibiofilm agent against P. aeruginosa and warrant further development of this peptide as a novel therapeutic for treatment of P. aeruginosa‒associated biofilm infections.
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Affiliation(s)
- Kittitat Teerapo
- Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
| | - Sittiruk Roytrakul
- Genome Institute, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency, Thailand Science Park, Pathumthani, Thailand
| | - Anchalee Sistayanarain
- Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
| | - Duangkamol Kunthalert
- Department of Microbiology and Parasitology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
- Centre of Excellence in Medical Biotechnology, Faculty of Medical Science, Naresuan University, Phitsanulok, Thailand
- * E-mail: ,
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Alves AR, Sequeira AM, Cunha Â. Increase in bacterial biosurfactant production by co-cultivation with biofilm-forming bacteria. Lett Appl Microbiol 2019; 69:79-86. [PMID: 31077423 DOI: 10.1111/lam.13169] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2019] [Revised: 05/03/2019] [Accepted: 05/06/2019] [Indexed: 12/17/2022]
Abstract
Considering that bacterial biosurfactants (BSFs) are released as secondary metabolites involved in biotic relations within mixed bacterial assemblages, the hypothesis that the co-cultivation of BSF producing bacteria with biofilm-forming strains would enhance BSF synthesis was tested. Environmental BSF producing strains of Bacillus licheniformis and Pseudomonas sp. were cultivated with reference biofilm-forming strains (Pseudomonas aeruginosa and Listeria innocua). BSF production and quorum-quenching effects were tested in solid media. Tensioactive and anionic BSFs were also quantified in cell-free extracts (CFEs). BSF production increased in co-cultures with inducer strains although this was not demonstrated by all screening methods. Increased concentrations of anionic BSF were detected in CFEs of co-cultures in which Pseudomonas aeruginosa was included as inducer, which is in accordance with the observation of larger halos in cetyl trimethylammonium bromide-methylene blue agar. The results demonstrate that co-cultivation positively affects the efficiency of BSF production and that higher production yields may be attained by selecting convenient inducer partners in designed consortia. SIGNIFICANCE AND IMPACT OF THE STUDY: The high production cost of biosurfactants (BSFs) still represents a major limitation to the industrial use of these otherwise advantageous alternatives to chemical surfactants. This work demonstrates that the co-cultivation of consortia of biosurfactant-producer and biofilm-forming bacteria enhances BSF production and may contribute to the cost-effectiveness of biosurfactant-based products.
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Affiliation(s)
- A R Alves
- Biology Department & CESAM, University of Aveiro, Aveiro, Portugal
| | - A M Sequeira
- Biology Department & CESAM, University of Aveiro, Aveiro, Portugal
| | - Â Cunha
- Biology Department & CESAM, University of Aveiro, Aveiro, Portugal
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119
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Saleh MM, Sadeq RA, Latif HKA, Abbas HA, Askoura M. Zinc oxide nanoparticles inhibits quorum sensing and virulence in Pseudomonas aeruginosa. Afr Health Sci 2019; 19:2043-2055. [PMID: 31656488 PMCID: PMC6794539 DOI: 10.4314/ahs.v19i2.28] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Background Quorum sensing inhibitionis an advanced strategy that aims to interfere with bacterial cell-to-cell communication systems (quorum sensing), which regulate virulence factors production in Pseudomonas aeruginosa, in order to overcome the globalcrisis of antimicrobial resistance. Objectives Study the potential quorum sensing inhibitory effect of Zinc oxide (ZnO)nanoparticlesin Pseudomonas aeruginosa and the impact on production of virulence factors. Methods Quorum sensing inhibitory effect of ZnO was evaluated by assessing its ability to reducePseudomonas aeruginosa virulence factors production; rhamnolipids, pyocyanin, pyoverdin, hemolysins, elastase and proteases. Furthermore, qRT-PCR was performed to determine ZnO inhibitory effect onQS-regulatory geneslasI, lasR, rhlI, rhlR, pqsA and pqsR that control virulence factors secretion. Moreover, mice survival test was conducted to investigate the influence of ZnO on Pseudomonas aeruginosa-induced mortality in vivo. Results ZnO revealed a statistically significant reduction in the production of QS-controlled virulence factors rhamnolipids, pyocyanin, pyoverdin, hemolysins, elastase and proteases. Furthermore, ZnO exhibited a significant decrease in the relative expression of QS-regulatory geneslasI, lasR, rhlI, rhlR, pqsA and pqsR. Additionally, ZnO significantly reduced the pathogenesis of Pseudomonas aeruginosa in vivo Conclusion ZnO nanoparticles can be used as a quorum sensing inhibitor in Pseudomonas aeruginosa infections either as an adjuvant or alternative to conventional antimicrobials.
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Affiliation(s)
- Moustafa M Saleh
- Department of Microbiology and Immunology, Faculty of Pharmacy, Port Said University, Port Said 42515, Egypt
| | - Refa't A Sadeq
- Department of Microbiology and Immunology, Faculty of Medicine, Port Said University, Egypt
| | - Hemat K Abdel Latif
- Department of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Egypt
| | - Hisham A Abbas
- Department of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Egypt
| | - Momen Askoura
- Department of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Egypt
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120
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In-situ detection based on the biofilm hydrophilicity for environmental biofilm formation. Sci Rep 2019; 9:8070. [PMID: 31147580 PMCID: PMC6542837 DOI: 10.1038/s41598-019-44167-6] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2018] [Accepted: 05/10/2019] [Indexed: 12/11/2022] Open
Abstract
A biofilm has a unique structure composed of microorganisms, extracellular polymeric substances (EPSs), etc., and it is layered on a substrate in water. In material science, it is important to detect the biofilm formed on a surface to prevent biofouling. EPSs, the major component of the biofilm, mainly consist of polysaccharides, proteins, nucleic acids, and lipids. Because these biomolecules have a variety of hydrophilicities or hydrophobicities, the substrate covered with the biofilm shows different wettability from the initial state. To detect the biofilm formation, this study employed a liquid-squeezing-based wettability assessment method with a simple wettability index: the liquid-squeezed diameter of a smaller value indicates higher wettability. The method is based on the liquid-squeezing behaviour of a liquid that covers sample surfaces when an air-jet is applied. To form the biofilm, polystyrene surfaces were immersed and incubated in a water-circulated bioreactor that had collected microorganisms in ambient air. After the 14-d incubation, good formation of the biofilm on the surfaces was confirmed by staining with crystal violet. Although the contact angles of captive bubbles on the surfaces with the biofilm were unmeasurable, the liquid-squeezing method could distinguish between hydrophilic and hydrophobic initial surfaces with and without biofilm formation using the diameter of the liquid-squeezed area. The surface wettability is expected to be a promising property for in-situ detection of biofilm formation on a macroscopic scale.
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121
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An SQ, Murtagh J, Twomey KB, Gupta MK, O'Sullivan TP, Ingram R, Valvano MA, Tang JL. Modulation of antibiotic sensitivity and biofilm formation in Pseudomonas aeruginosa by interspecies signal analogues. Nat Commun 2019; 10:2334. [PMID: 31133642 PMCID: PMC6536496 DOI: 10.1038/s41467-019-10271-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2015] [Accepted: 04/24/2019] [Indexed: 11/15/2022] Open
Abstract
Pseudomonas aeruginosa, a significant opportunistic pathogen, can participate in inter-species communication through signaling by cis-2-unsaturated fatty acids of the diffusible signal factor (DSF) family. Sensing these signals leads to altered biofilm formation and increased tolerance to various antibiotics, and requires the histidine kinase PA1396. Here, we show that the membrane-associated sensory input domain of PA1396 has five transmembrane helices, two of which are required for DSF sensing. DSF binding is associated with enhanced auto-phosphorylation of PA1396 incorporated into liposomes. Further, we examined the ability of synthetic DSF analogues to modulate or inhibit PA1396 activity. Several of these analogues block the ability of DSF to trigger auto-phosphorylation and gene expression, whereas others act as inverse agonists reducing biofilm formation and antibiotic tolerance, both in vitro and in murine infection models. These analogues may thus represent lead compounds to develop novel adjuvants improving the efficacy of existing antibiotics.
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Affiliation(s)
- Shi-Qi An
- National Biofilms Innovation Centers, Biological Sciences, University of Southampton, Southampton, SO17 1BJ, UK.
- The Wellcome-Wolfson Institute for Experimental Medicine, Queen's University of Belfast, Belfast, BT9 7BL, UK.
| | - Julie Murtagh
- School of Microbiology, Biosciences Institute, University College Cork, Cork, T12, Ireland
| | - Kate B Twomey
- School of Microbiology, Biosciences Institute, University College Cork, Cork, T12, Ireland
| | - Manoj K Gupta
- School of Chemistry, University College Cork, Cork, T12, Ireland
- Department of Chemistry, Central University of Haryana, Mahendergarh, 123029, Haryana, India
| | - Timothy P O'Sullivan
- School of Chemistry, University College Cork, Cork, T12, Ireland
- School of Pharmacy, University College Cork, Cork, T12, Ireland
| | - Rebecca Ingram
- The Wellcome-Wolfson Institute for Experimental Medicine, Queen's University of Belfast, Belfast, BT9 7BL, UK
| | - Miguel A Valvano
- The Wellcome-Wolfson Institute for Experimental Medicine, Queen's University of Belfast, Belfast, BT9 7BL, UK.
| | - Ji-Liang Tang
- State Key Laboratory for Conservation and Utilization of Subtropical Agro-bioresources, College of Life Science and Technology, Guangxi University, 100 Daxue Road, Nanning, 530004, China.
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122
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Differential effects of alkyl gallates on quorum sensing in Pseudomonas aeruginosa. Sci Rep 2019; 9:7741. [PMID: 31123307 PMCID: PMC6533263 DOI: 10.1038/s41598-019-44236-w] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 05/13/2019] [Indexed: 02/07/2023] Open
Abstract
Virulence factors and biofilms constitute attractive targets for the prevention of infections caused by multidrug-resistant bacteria. Among alkyl gallates, propyl gallate (PG) and octyl gallate (OG) are used as food preservatives. Here we found that alkyl gallates differentially affect virulence, biofilm formation, and quorum sensing (QS) in Pseudomonas aeruginosa. Ethyl gallate (EG), PG, and butyl gallate (BG) inhibited biofilm formation and virulence factors including elastase, pyocyanin, and rhamnolipid, in P. aeruginosa without affecting cell viability by antagonizing the QS receptors LasR and RhlR. PG exhibited the most potent activity. Interestingly, hexyl gallate (HG) inhibited the production of rhamnolipid and pyocyanin but did not affect elastase production or biofilm formation. Notably, OG inhibited the production of rhamnolipid and pyocyanin but stimulated elastase production and biofilm formation. Analysis of QS signaling molecule production and QS gene expression suggested that HG inhibited RhlR, while OG activated LasR but inhibited PqsR. This mechanism was confirmed using QS mutants. Additionally, PG prevented the virulence of P. aeruginosa in Caenorhabditis elegans and a mouse model. This is the first report of the differential effects of alkyl gallates on QS systems and PG has great potential as an inhibitor of the virulence and biofilm formation of P. aeruginosa.
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123
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El Dine RS, Elfaky MA, Asfour H, El Halawany AM. Anti-adhesive activity of Aframomum melegueta major phenolics on lower respiratory tract pathogens. Nat Prod Res 2019; 35:539-547. [PMID: 31070056 DOI: 10.1080/14786419.2019.1585843] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Recent studies have raised interest in the potential health effect of Aframomum melegueta, which is related to the phenolic content of its seeds. The methanolic extract of A. melegueta seeds showed a significant anti-adhesive effect against Staphylococcus aureus to lung carcinoma cell line in a concentration-dependent manner. The n-butanol and the chloroform fractions exhibited a significant antiadhesive activity against S. aureus. The chloroform fraction exhibited an antiadhesive effect of 49.53%, 40.15% and 70.34% at concentrations 25, 50 and 100 µg/mL, respectively. Through a biologically guided isolation, the chloroform fraction yielded a new diarylheptanoid identified using 1D, 2D NMR and HREIMS and named 3-(S)-acetyl-1-(4',5'-dihydroxy-3'- methoxyphenyl)-7-(3″,4″-dihydroxyphenyl)heptane(1), in addition to eight known compounds (2-9). Compounds (1), 6-paradol (5), [6]-shogaol (7), [8]-gingerol(8) and dihydro[6]paradol (9) exhibited a significant anti-adhesive activity against S. aureus with a % of inhibition of adhesion of 60.58, 50, 70.07, 85.4, 59.85% at 50 µg/mL, respectively. Additionally, the extract's capacity to reduce adhesion without reducing bacterial growth reduces the likeliness of resistance development.
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Affiliation(s)
- Riham Salah El Dine
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Mahmoud A Elfaky
- Department of Natural Products and Alternative Medicine, Faculty of Pharmacy, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Hany Asfour
- Department of Medical Microbiology and Parasitology, Faculty of Medicine, Princess Al-Jawhara Center of Excellence in Research of Hereditary Disorders, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Ali M El Halawany
- Department of Pharmacognosy, Faculty of Pharmacy, Cairo University, Cairo, Egypt
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Mohanvel SK, Ravichandran V, Kamalanathan C, Satish AS, Ramesh S, Lee J, Rajasekharan SK. Molecular docking and biological evaluation of novel urea-tailed mannich base against Pseudomonas aeruginosa. Microb Pathog 2019; 130:104-111. [DOI: 10.1016/j.micpath.2019.02.037] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2018] [Revised: 12/18/2018] [Accepted: 02/28/2019] [Indexed: 10/27/2022]
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Current Status of In Vitro Models and Assays for Susceptibility Testing for Wound Biofilm Infections. Biomedicines 2019; 7:biomedicines7020034. [PMID: 31052271 PMCID: PMC6630351 DOI: 10.3390/biomedicines7020034] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2019] [Revised: 04/20/2019] [Accepted: 04/26/2019] [Indexed: 12/17/2022] Open
Abstract
Biofilm infections have gained recognition as an important therapeutic challenge in the last several decades due to their relationship with the chronicity of infectious diseases. Studies of novel therapeutic treatments targeting infections require the development and use of models to mimic the formation and characteristics of biofilms within host tissues. Due to the diversity of reported in vitro models and lack of consensus, this review aims to provide a summary of in vitro models currently used in research. In particular, we review the various reported in vitro models of Pseudomonas aeruginosa biofilms due to its high clinical impact in chronic wounds and in other chronic infections. We assess advances in in vitro models that incorporate relevant multispecies biofilms found in infected wounds, such as P. aeruginosa with Staphylococcus aureus, and additional elements such as mammalian cells, simulating fluids, and tissue explants in an attempt to better represent the physiological conditions found at an infection site. It is hoped this review will aid researchers in the field to make appropriate choices in their proposed studies with regards to in vitro models and methods.
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126
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Özcan SS, Dieser M, Parker AE, Balasubramanian N, Foreman CM. Quorum sensing inhibition as a promising method to control biofilm growth in metalworking fluids. J Ind Microbiol Biotechnol 2019; 46:1103-1111. [PMID: 31020467 DOI: 10.1007/s10295-019-02181-7] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2018] [Accepted: 04/10/2019] [Indexed: 11/24/2022]
Abstract
Microbial contamination in metalworking systems is a critical problem. This study determined the microbial communities in metalworking fluids (MWFs) from two machining shops and investigated the effect of quorum sensing inhibition (QSI) on biofilm growth. In both operations, biofilm-associated and planktonic microbial communities were dominated by Pseudomonadales (60.2-99.7%). Rapid recolonization was observed even after dumping spent MWFs and meticulous cleaning. Using Pseudomonas aeruginosa PAO1 as a model biofilm organism, patulin (40 µM) and furanone C-30 (75 µM) were identified as effective QSI agents. Both agents had a substantially higher efficacy compared to α-amylase (extracellular polymeric substance degrading enzyme) and reduced biofilm formation by 63% and 76%, respectively, in MWF when compared to untreated controls. Reduced production of putatively identified homoserine lactones and quinoline in MWF treated with QS inhibitors support the effect of QSI on biofilm formation. The results highlight the effectiveness of QSI as a potential strategy to eradicate biofilms in MWFs.
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Affiliation(s)
- Safiye Selen Özcan
- Department of Chemical and Biological Engineering, Montana State University, Bozeman, MT, 59715, USA.,Center for Biofilm Engineering, Montana State University, 366 Barnard Hall, Bozeman, MT, 59717, USA
| | - Markus Dieser
- Department of Chemical and Biological Engineering, Montana State University, Bozeman, MT, 59715, USA.,Center for Biofilm Engineering, Montana State University, 366 Barnard Hall, Bozeman, MT, 59717, USA
| | - Albert E Parker
- Center for Biofilm Engineering, Montana State University, 366 Barnard Hall, Bozeman, MT, 59717, USA.,Department of Mathematical Sciences, Montana State University, Bozeman, MT, 59717, USA
| | | | - Christine M Foreman
- Department of Chemical and Biological Engineering, Montana State University, Bozeman, MT, 59715, USA. .,Center for Biofilm Engineering, Montana State University, 366 Barnard Hall, Bozeman, MT, 59717, USA.
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127
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Anti-PqsR compounds as next-generation antibacterial agents against Pseudomonas aeruginosa: A review. Eur J Med Chem 2019; 172:26-35. [PMID: 30939351 DOI: 10.1016/j.ejmech.2019.03.049] [Citation(s) in RCA: 47] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2018] [Revised: 03/19/2019] [Accepted: 03/19/2019] [Indexed: 01/31/2023]
Abstract
Nowadays, due to spreading antibiotic resistance among clinically relevant pathogens, the requirement of novel therapeutic approaches is felt more than ever. One of the alternative strategies is anti-virulence therapy without affecting bacterial growth or viability. In Pseudomonas aeruginosa, an opportunistic human pathogen that exhibits intrinsic multi-drug resistance, both virulence factors' production and biofilm formation depends on its quorum sensing (QS) network. Therefore, targeting the key proteins involved in QS system is an attractive method to overcome P. aeruginosa pathogenicity and resistance. The transcriptional regulator PqsR, also called MvfR, is one of these major proteins which employs 3,4-dihydroxy-2-heptylquinoline (PQS) and 4-hydroxy-2-heptylquinoline (HHQ) as signaling molecules. Reviewing the advances in development of small molecules inhibit this protein, assist to open a new window to smart molecule design that may revolutionize treatment of P. aeruginosa infections.
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128
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Tapia-Rodriguez MR, Bernal-Mercado AT, Gutierrez-Pacheco MM, Vazquez-Armenta FJ, Hernandez-Mendoza A, Gonzalez-Aguilar GA, Martinez-Tellez MA, Nazzaro F, Ayala-Zavala JF. Virulence of Pseudomonas aeruginosa exposed to carvacrol: alterations of the Quorum sensing at enzymatic and gene levels. J Cell Commun Signal 2019; 13:531-537. [PMID: 30903602 DOI: 10.1007/s12079-019-00516-8] [Citation(s) in RCA: 32] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Accepted: 03/11/2019] [Indexed: 10/27/2022] Open
Abstract
The main goal of this study was to evaluate the inhibition of Pseudomonas aeruginosa virulence factors and Quorum Sensing during exposure to carvacrol. P. aeruginosa (ATCC 10154) was exposed to carvacrol determining changes in biofilm development, motility, acyl-homoserine lactones (AHL) synthesis and relative expression of lasI/lasR. Docking analysis was used to determinate interactions between carvacrol with LasI and LasR proteins. P. aeruginosa produced 60% lower AHLs when exposed to carvacrol (1.9 mM) compared to control, without affecting cellular viability, indicating a reduction on the LasI synthase activity. AHL-C12, C6, and C4 were detected and related to biofilm development, motility, and pyocyanin production, respectively. The presence of carvacrol reduced the expression of lasR, without affecting lasI gen. Moreover, computational docking showed interactions of carvacrol with amino acids in the active site pocket of LasI (-5.6 kcal mol-1) and within the binding pocket of LasR (-6.7 kcal mol-1) of P. aeruginosa. These results demonstrated that virulence of P. aeruginosa was reduced by carvacrol, by inhibiting LasI activity with the concomitant reduction on the expression of lasR, biofilm and swarming motility. This study provides relevant information about the effect of carvacrol against quorum sensing to inhibit virulence factors of P. aeruginosa at enzymatic and gene levels. These findings can contribute to the development of natural anti-QS products, which can affect pathogenesis.
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Affiliation(s)
- Melvin R Tapia-Rodriguez
- Centro de Investigacion en Alimentacion y Desarrollo, A.C., Carretera Gustavo Enrique Astiazarán Rosas, N0. 46, La Victoria, 83304, Hermosillo, Sonora, Mexico
| | - A Thalia Bernal-Mercado
- Centro de Investigacion en Alimentacion y Desarrollo, A.C., Carretera Gustavo Enrique Astiazarán Rosas, N0. 46, La Victoria, 83304, Hermosillo, Sonora, Mexico
| | - M Melissa Gutierrez-Pacheco
- Centro de Investigacion en Alimentacion y Desarrollo, A.C., Carretera Gustavo Enrique Astiazarán Rosas, N0. 46, La Victoria, 83304, Hermosillo, Sonora, Mexico
| | - Francisco J Vazquez-Armenta
- Centro de Investigacion en Alimentacion y Desarrollo, A.C., Carretera Gustavo Enrique Astiazarán Rosas, N0. 46, La Victoria, 83304, Hermosillo, Sonora, Mexico
| | - Adrian Hernandez-Mendoza
- Centro de Investigacion en Alimentacion y Desarrollo, A.C., Carretera Gustavo Enrique Astiazarán Rosas, N0. 46, La Victoria, 83304, Hermosillo, Sonora, Mexico
| | - Gustavo A Gonzalez-Aguilar
- Centro de Investigacion en Alimentacion y Desarrollo, A.C., Carretera Gustavo Enrique Astiazarán Rosas, N0. 46, La Victoria, 83304, Hermosillo, Sonora, Mexico
| | - Miguel Angel Martinez-Tellez
- Centro de Investigacion en Alimentacion y Desarrollo, A.C., Carretera Gustavo Enrique Astiazarán Rosas, N0. 46, La Victoria, 83304, Hermosillo, Sonora, Mexico
| | - Filomena Nazzaro
- Istituto di Scienze dell'Alimentazione, ISA-CNR, Via Roma, 64, 83100, Avellino, Italy
| | - J Fernando Ayala-Zavala
- Centro de Investigacion en Alimentacion y Desarrollo, A.C., Carretera Gustavo Enrique Astiazarán Rosas, N0. 46, La Victoria, 83304, Hermosillo, Sonora, Mexico.
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Ahmed SAKS, Rudden M, Smyth TJ, Dooley JSG, Marchant R, Banat IM. Natural quorum sensing inhibitors effectively downregulate gene expression of Pseudomonas aeruginosa virulence factors. Appl Microbiol Biotechnol 2019; 103:3521-3535. [PMID: 30852658 PMCID: PMC6449319 DOI: 10.1007/s00253-019-09618-0] [Citation(s) in RCA: 120] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2018] [Revised: 01/02/2019] [Accepted: 01/04/2019] [Indexed: 12/02/2022]
Abstract
At present, anti-virulence drugs are being considered as potential therapeutic alternatives and/or adjuvants to currently failing antibiotics. These drugs do not kill bacteria but inhibit virulence factors essential for establishing infection and pathogenesis through targeting non-essential metabolic pathways reducing the selective pressure to develop resistance. We investigated the effect of naturally isolated plant compounds on the repression of the quorum sensing (QS) system which is linked to virulence/pathogenicity in Pseudomonas aeruginosa. Our results show that trans-cinnamaldehyde (CA) and salicylic acid (SA) significantly inhibit expression of QS regulatory and virulence genes in P. aeruginosa PAO1 at sub-inhibitory levels without any bactericidal effect. CA effectively downregulated both the las and rhl QS systems with lasI and lasR levels inhibited by 13- and 7-fold respectively compared to 3- and 2-fold reductions with SA treatment, during the stationary growth phase. The QS inhibitors (QSI) also reduced the production of extracellular virulence factors with CA reducing protease, elastase and pyocyanin by 65%, 22% and 32%, respectively. The QSIs significantly reduced biofilm formation and concomitantly with repressed rhamnolipid gene expression, only trace amount of extracellular rhamnolipids were detected. The QSIs did not completely inhibit virulence factor expression and production but their administration significantly lowered the virulence phenotypes at both the transcriptional and extracellular levels. This study shows the significant inhibitory effect of natural plant-derived compounds on the repression of QS systems in P. aeruginosa.
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Affiliation(s)
- Syed A K S Ahmed
- School of Biomedical Sciences, Ulster University, Coleraine, BT52 1SA, UK
| | - Michelle Rudden
- Department of Biology, University of York, Wentworth, York, YO10 5DD, UK
| | - Thomas J Smyth
- School of Science, Institute of Technology Sligo, Sligo, Ireland
| | - James S G Dooley
- School of Biomedical Sciences, Ulster University, Coleraine, BT52 1SA, UK.
| | - Roger Marchant
- School of Biomedical Sciences, Ulster University, Coleraine, BT52 1SA, UK
| | - Ibrahim M Banat
- School of Biomedical Sciences, Ulster University, Coleraine, BT52 1SA, UK
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130
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Kamarudheen N, Rao KB. Fatty acyl compounds from marine Streptomyces griseoincarnatus strain HK12 against two major bio-film forming nosocomial pathogens; an in vitro and in silico approach. Microb Pathog 2019; 127:121-130. [DOI: 10.1016/j.micpath.2018.11.050] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2018] [Revised: 11/28/2018] [Accepted: 11/29/2018] [Indexed: 10/27/2022]
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131
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Joshi C, Patel P, Palep H, Kothari V. Validation of the anti-infective potential of a polyherbal 'Panchvalkal' preparation, and elucidation of the molecular basis underlining its efficacy against Pseudomonas aeruginosa. BMC COMPLEMENTARY AND ALTERNATIVE MEDICINE 2019; 19:19. [PMID: 30654785 PMCID: PMC6335721 DOI: 10.1186/s12906-019-2428-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2018] [Accepted: 01/02/2019] [Indexed: 02/02/2023]
Abstract
BACKGROUND A Panchvalkal formulation (Pentaphyte P-5®) mentioned in ancient texts of Indian traditional medicine was investigated for its anti-infective potential against Pseudomonas aeruginosa. METHODS Effect of the test formulation on bacterial growth and pigment production was evaluated by broth dilution assay. In vivo efficacy was evaluated using Caenorhabditis elegans as the model host. Whole transcriptome approach was taken to study the effect of test formulation on bacterial gene expression. RESULTS This formulation in vitro was found to be capable of affecting quorum sensing (QS)-regulated traits (pyocyanin, pyoverdine, biofilm) of Pseudomonas aeruginosa. In combination with antibiotics, it enhanced susceptibility of the test bacterium to antibiotics like cephalexin and tetracycline. Effect of Panchvalkal formulation (PF) on QS-regulated traits of P. aeruginosa was not reversed even after repeated exposure of the bacterium to PF. In vivo efficacy of PF was demonstrated employing Caenorhabditis elegans as the model host, wherein PF-treated bacteria were able to kill lesser worms than their extract-unexposed counterparts. Whole transcriptome study revealed that approximately 14% of the P. aeruginosa genome was expressed differently under the influence of PF. CONCLUSIONS Major mechanisms through which Panchvalkal seems to exert its anti-virulence effect are generation of nitrosative and oxidative stress, and disturbing iron and molybdenum homeostasis, besides interfering with QS machinery. This study is a good demonstration of the therapeutic utility of the 'polyherbalism' concept, so common in ayurved. It also demonstrates utility of the modern 'omics' tools for validating the traditional medicine i.e. ayuromics.
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Affiliation(s)
- Chinmayi Joshi
- Institute of Science, Nirma University, Ahmedabad, 382481 India
| | - Pooja Patel
- Institute of Science, Nirma University, Ahmedabad, 382481 India
| | | | - Vijay Kothari
- Institute of Science, Nirma University, Ahmedabad, 382481 India
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132
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Vijayababu P, Samykannu G, Thomas J, Antonyraj CB, Narayanan S, Piramanayagam S. Patulin interference with ATP binding cassette transferring auto inducer −2 in Salmonella typhi and biofilm inhibition via quorum sensing. INFORMATICS IN MEDICINE UNLOCKED 2019. [DOI: 10.1016/j.imu.2019.100230] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022] Open
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133
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Shah MD, Kharkar PS, Sahu NU, Peerzada Z, Desai KB. Potassium 2-methoxy-4-vinylphenolate: a novel hit exhibiting quorum-sensing inhibition in Pseudomonas aeruginosa viaLasIR/RhlIR circuitry. RSC Adv 2019; 9:40228-40239. [PMID: 35542690 PMCID: PMC9076179 DOI: 10.1039/c9ra06612h] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2019] [Revised: 12/18/2019] [Accepted: 11/19/2019] [Indexed: 02/05/2023] Open
Abstract
Effect of potassium 2-methoxy-4-vinylphenolate on quorum sensing inPseudomonas aeruginosa.
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Affiliation(s)
- Mayank D. Shah
- Sunandan Divatia School of Science
- SVKM's NMIMS (Deemed to be University)
- Mumbai
- India
| | - Prashant S. Kharkar
- Institute of Chemical Technology
- Category I Deemed to be University (MHRD/UGC)
- Mumbai-400019
- India
| | - Niteshkumar U. Sahu
- Institute of Chemical Technology
- Category I Deemed to be University (MHRD/UGC)
- Mumbai-400019
- India
| | - Zoya Peerzada
- Sunandan Divatia School of Science
- SVKM's NMIMS (Deemed to be University)
- Mumbai
- India
| | - Krutika B. Desai
- Mithibai College of Arts & Science & Amrutben Jivanlal College of Commerce & Economics
- Mumbai
- India
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134
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Qais FA, Khan MS, Ahmad I. Broad-spectrum quorum sensing and biofilm inhibition by green tea against gram-negative pathogenic bacteria: Deciphering the role of phytocompounds through molecular modelling. Microb Pathog 2019; 126:379-392. [DOI: 10.1016/j.micpath.2018.11.030] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2018] [Revised: 11/17/2018] [Accepted: 11/22/2018] [Indexed: 01/08/2023]
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135
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Sharma S, Gopu V, Sivasankar C, Shetty PH. Hydrocinnamic acid produced byEnterobacter xiangfangensisimpairs AHL-based quorum sensing and biofilm formation inPseudomonas aeruginosa. RSC Adv 2019; 9:28678-28687. [PMID: 35529628 PMCID: PMC9071187 DOI: 10.1039/c9ra05725k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2019] [Accepted: 09/05/2019] [Indexed: 11/21/2022] Open
Abstract
Hydrocinnamic acid interacts with LasR receptor averts the autoinducer biding to modulate the expression of quorum sensing mediated phenotypes that strengthens the speculation of hydrocinnamic acid acts as a competitive inhibitor for autoinducer molecule.
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Affiliation(s)
- Shivangi Sharma
- Department of Food Science and Technology
- Pondicherry University
- Pondicherry 605014
- India
| | - Venkadesaperumal Gopu
- Department of Food Science and Technology
- Pondicherry University
- Pondicherry 605014
- India
| | - Chandran Sivasankar
- Department of Food Science and Technology
- Pondicherry University
- Pondicherry 605014
- India
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136
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Updates on the pathogenicity status of Pseudomonas aeruginosa. Drug Discov Today 2019; 24:350-359. [DOI: 10.1016/j.drudis.2018.07.003] [Citation(s) in RCA: 128] [Impact Index Per Article: 25.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Revised: 07/03/2018] [Accepted: 07/16/2018] [Indexed: 01/06/2023]
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137
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Saleh MM, Abbas HA, Askoura MM. Repositioning secnidazole as a novel virulence factors attenuating agent in Pseudomonas aeruginosa. Microb Pathog 2018; 127:31-38. [PMID: 30500409 DOI: 10.1016/j.micpath.2018.11.042] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 11/26/2018] [Indexed: 11/25/2022]
Abstract
Long-term treatment with antibiotics gives rise to the evolution of multi-drug resistant bacteria which are hard to be treated. Virulence factors inhibitors depend on disarming of microbial pathogens through reducing expression of virulence factors, abolishing the pathogen capability to harm the host. In the present study, the influence of secnidazole on Pseudomonas aeruginosa virulence factors expression was characterized. Production of Pseudomonas aeruginosa virulence factors such as pyocyanin, pyoverdin, elastase, rhamnolipids, proteases and hemolysins was examined following treatment of bacteria with sub-inhibitory concentration of secnidazole. Interestingly, secnidazole showed a powerful inhibitory effect on Pseudomonas aeruginosa virulence factors. Our results were further confirmed using qRT-PCR showing that there was a significant decrease in the expression of quorum sensing genes; lasI, lasR, rhlI, rhlR, pqsA and pqsR that regulate expression of virulence factors in Pseudomonas aeruginosa. Moreover, in vivo experiment using mice as infection model showed that secnidazole-treated bacteria were less capable to kill mice as compared to untreated bacteria. Importantly, there was a significant reduction in mortality in mice injected with secnidazole-treated bacteria relative to mice inoculated with untreated bacteria. In summary, our data showed that secnidazole could play a role in attenuating Pseudomonas aeruginosa through reducing virulence factors production. Moreover, our data clearly suggest that secnidazole could be involved in the treatment of Pseudomonas aeruginosa infections in order to control infection and lower the development of bacterial resistance to antibiotics.
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Affiliation(s)
- Moustafa M Saleh
- Department of Microbiology and Immunology, Faculty of Pharmacy, Port Said University, Egypt.
| | - Hisham A Abbas
- Department of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Egypt.
| | - Momen M Askoura
- Department of Microbiology and Immunology, Faculty of Pharmacy, Zagazig University, Egypt.
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138
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Ma H, Ma S, Hu H, Ding L, Ren H. The biological role of N-acyl-homoserine lactone-based quorum sensing (QS) in EPS production and microbial community assembly during anaerobic granulation process. Sci Rep 2018; 8:15793. [PMID: 30361560 PMCID: PMC6202354 DOI: 10.1038/s41598-018-34183-3] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2018] [Accepted: 09/25/2018] [Indexed: 12/26/2022] Open
Abstract
Although N-acyl-L-homoserine lactone (AHL) based quorum sensing (QS) phenomenon has been observed in mature anaerobic granules, the biological role of AHL-based QS system in anaerobic granulation process remains unexplored. For the first time, a long-term anaerobic bioreactor was operated for 168 days to investigate the biological role of AHL in the granulation process which was divided into three phases (phase I: floccular, phase II: granulation, phase III: maturation). Two different AHLs including C8-HSL and C10-HSL were characterized at nanogram levels. The AHL level was elevated over 20-fold and strongly positively correlated with extracellular polymeric substances (EPS) production and sludge particle size during phase I-II. Exogenous addition of AHL to the floccular sludge also resulted in significantly increased EPS production. Metadata analysis suggested that the granulation process was accompanied by an increase in the abundance of QS-relevant microorganisms. The strong relationships (R > 0.9233, p < 0.01) among AHL concentrations, EPS (except loosely bound EPS), granulation and community variation indicated that AHL-mediated QS played an important role in coordinating community level behaviors associated with granulation, potentially through the regulation of EPS production and composition. This study gives a deep insight into the underlying QS-relevant mechanism of anaerobic granulation process.
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Affiliation(s)
- Haijun Ma
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, P. R. China
| | - Sijia Ma
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, P. R. China
| | - Haidong Hu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, P. R. China
| | - Lili Ding
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, P. R. China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210023, Jiangsu, P. R. China.
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139
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Ravichandran V, Zhong L, Wang H, Yu G, Zhang Y, Li A. Virtual Screening and Biomolecular Interactions of CviR-Based Quorum Sensing Inhibitors Against Chromobacterium violaceum. Front Cell Infect Microbiol 2018; 8:292. [PMID: 30234025 PMCID: PMC6132053 DOI: 10.3389/fcimb.2018.00292] [Citation(s) in RCA: 39] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2018] [Accepted: 07/30/2018] [Indexed: 12/31/2022] Open
Abstract
The rise of bacterial multi drug resistance becomes a global threat to the mankind. Therefore it is essential to find out alternate strategies to fight against these "super bugs." Quorum sensing (QS) is a cell-to-cell communication mechanism by which many bacteria regulate their biofilm and virulence factors expression to execute their pathogenesis. Hence, interfering the quorum sensing is an effective alternate strategy against various pathogens. In this study, we aimed to find out potential CviR-mediated quorum sensing inhibitors (QSIs) against Chromobacterium violaceum. Virtual screening from a natural products database, in vitro biofilm and violacein inhibition assays have been performed. Biofilm formation was investigated using confocal microscopy and gene expression studies were carried out using qRT-PCR. Further, to study the biomolecular interaction of QSIs with purified CviR Protein (a LuxR homologue), microscale thermophoresis (MST) analysis was performed. Results suggested that phytochemicals SPL, BN1, BN2, and C7X have potential GScore when compared to cognate ligand and reduced the biofilm formation and violacein production significantly. Especially, 100 μM of BN1 drastically reduced the biofilm formation about 82.61%. qRT-PCR studies revealed that cviI, cviR, vioB, vioC, vioD genes were significantly down regulated by QSIs. MST analysis confirmed the molecular interactions between QSIs and purified CviR protein which cohere with the docking results. Interestingly, we found that BN2 has better interaction with CviR (Kd = 45.07 ±1.90 nm). Overall results suggested that QSIs can potentially interact with CviR and inhibit the QS in a dose dependent manner. Since, LuxR homologs present in more than 100 bacterial species, these QSIs may be developed as broad spectrum anti-infective drugs in future.
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Affiliation(s)
| | | | | | | | - Youming Zhang
- State Key Laboratory of Microbial Technology, Shandong University–Helmholtz Institute of Biotechnology (SHIB), School of Life Science, Shandong University, Qingdao, China
| | - Aiying Li
- State Key Laboratory of Microbial Technology, Shandong University–Helmholtz Institute of Biotechnology (SHIB), School of Life Science, Shandong University, Qingdao, China
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140
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Lee JH, Kim YG, Choi P, Ham J, Park JG, Lee J. Antibiofilm and Antivirulence Activities of 6-Gingerol and 6-Shogaol Against Candida albicans Due to Hyphal Inhibition. Front Cell Infect Microbiol 2018; 8:299. [PMID: 30211127 PMCID: PMC6121036 DOI: 10.3389/fcimb.2018.00299] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Accepted: 08/07/2018] [Indexed: 11/17/2022] Open
Abstract
Candida albicans is an opportunistic pathogen and responsible for candidiasis. C. albicans readily forms biofilms on various biotic and abiotic surfaces, and these biofilms can cause local and systemic infections. C. albicans biofilms are more resistant than its free yeast to antifungal agents and less affected by host immune responses. Transition of yeast cells to hyphal cells is required for biofilm formation and is believed to be a crucial virulence factor. In this study, six components of ginger were investigated for antibiofilm and antivirulence activities against a fluconazole-resistant C. albicans strain. It was found 6-gingerol, 8-gingerol, and 6-shogaol effectively inhibited biofilm formation. In particular, 6-shogaol at 10 μg/ml significantly reduced C. albicans biofilm formation but had no effect on planktonic cell growth. Also, 6-gingerol and 6-shogaol inhibited hyphal growth in embedded colonies and free-living planktonic cells, and prevented cell aggregation. Furthermore, 6-gingerol and 6-shogaol reduced C. albicans virulence in a nematode infection model without causing toxicity at the tested concentrations. Transcriptomic analysis using RNA-seq and qRT-PCR showed 6-gingerol and 6-shogaol induced several transporters (CDR1, CDR2, and RTA3), but repressed the expressions of several hypha/biofilm related genes (ECE1 and HWP1), which supported observed phenotypic changes. These results highlight the antibiofilm and antivirulence activities of the ginger components, 6-gingerol and 6-shogaol, against a drug resistant C. albicans strain.
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Affiliation(s)
- Jin-Hyung Lee
- School of Chemical Engineering, Yeungnam University, Gyeongsan, South Korea
| | - Yong-Guy Kim
- School of Chemical Engineering, Yeungnam University, Gyeongsan, South Korea
| | - Pilju Choi
- Natural Products Research Institute, Korea Institute of Science and Technology, Gangneung, South Korea
| | - Jungyeob Ham
- Natural Products Research Institute, Korea Institute of Science and Technology, Gangneung, South Korea
| | - Jae Gyu Park
- Advanced Bio Convergence Center, Pohang Technopark Foundation, Pohang, South Korea
| | - Jintae Lee
- School of Chemical Engineering, Yeungnam University, Gyeongsan, South Korea
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141
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Zhang Y, Sass A, Van Acker H, Wille J, Verhasselt B, Van Nieuwerburgh F, Kaever V, Crabbé A, Coenye T. Coumarin Reduces Virulence and Biofilm Formation in Pseudomonas aeruginosa by Affecting Quorum Sensing, Type III Secretion and C-di-GMP Levels. Front Microbiol 2018; 9:1952. [PMID: 30186266 PMCID: PMC6110822 DOI: 10.3389/fmicb.2018.01952] [Citation(s) in RCA: 47] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2018] [Accepted: 08/02/2018] [Indexed: 01/09/2023] Open
Abstract
As one of the major pathogens in wound infections, Pseudomonas aeruginosa produces several virulence factors and forms biofilms; these processes are under the regulation of various quorum sensing (QS) systems. Therefore, QS has been regarded as a promising target to treat P. aeruginosa infections. In the present study, we evaluated the effect of the plant-derived QS inhibitor coumarin on P. aeruginosa biofilms and virulence. Coumarin inhibited QS in the P. aeruginosa QSIS2 biosensor strain, reduced protease and pyocyanin production, and inhibited biofilm formation in microtiter plates in different P. aeruginosa strains. The effects of coumarin in inhibiting biofilm formation in an in vitro wound model and reducing P. aeruginosa virulence in the Lucilia sericata infection model were strain-dependent. Transcriptome analysis revealed that several key genes involved in the las, rhl, Pseudomonas quinolone signal (PQS), and integrated QS (IQS) systems were downregulated in coumarin-treated biofilms of P. aeruginosa PAO1. Coumarin also changed the expression of genes related to type III secretion and cyclic diguanylate (c-di-GMP) metabolism. The cellular c-di-GMP level of P. aeruginosa PAO1 and recent clinical P. aeruginosa strains was significantly reduced by coumarin. These results provide new evidence for the possible application of coumarin as an anti-biofilm and anti-virulence agent against P. aeruginosa in wound infections.
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Affiliation(s)
- Yunhui Zhang
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Andrea Sass
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Heleen Van Acker
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Jasper Wille
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Bruno Verhasselt
- Department of Medical Microbiology, Ghent University Hospital, Ghent, Belgium
| | | | - Volkhard Kaever
- Research Core Unit Metabolomics, Institute of Pharmacology, Hannover Medical School, Hanover, Germany
| | - Aurélie Crabbé
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
| | - Tom Coenye
- Laboratory of Pharmaceutical Microbiology, Ghent University, Ghent, Belgium
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142
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Dissolved oxygen-mediated enrichment of quorum-sensing phenomenon in the bacterial community to combat oxidative stress. Arch Microbiol 2018; 200:1371-1379. [DOI: 10.1007/s00203-018-1551-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 07/04/2018] [Accepted: 07/07/2018] [Indexed: 01/19/2023]
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143
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Hançer Aydemir D, Çifci G, Aviyente V, Boşgelmez-Tinaz G. Quorum-sensing inhibitor potential oftrans-anethole aganistPseudomonas aeruginosa. J Appl Microbiol 2018; 125:731-739. [DOI: 10.1111/jam.13892] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 03/21/2018] [Accepted: 04/17/2018] [Indexed: 01/07/2023]
Affiliation(s)
- D. Hançer Aydemir
- Vocational School of Health Services; Süleyman Demirel University; Isparta Turkey
| | - G. Çifci
- Deparment of Chemistry; Boğaziçi University; Istanbul Turkey
| | - V. Aviyente
- Deparment of Chemistry; Boğaziçi University; Istanbul Turkey
| | - G. Boşgelmez-Tinaz
- Department of Basic Pharmaceutical Sciences; Faculty of Pharmacy; Marmara University; Istanbul Turkey
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144
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Almeida FAD, Vargas ELG, Carneiro DG, Pinto UM, Vanetti MCD. Virtual screening of plant compounds and nonsteroidal anti-inflammatory drugs for inhibition of quorum sensing and biofilm formation in Salmonella. Microb Pathog 2018; 121:369-388. [PMID: 29763730 DOI: 10.1016/j.micpath.2018.05.014] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2018] [Revised: 04/17/2018] [Accepted: 05/11/2018] [Indexed: 02/08/2023]
Abstract
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. Thus, in view of the importance of quorum sensing on the physiology regulation of microorganisms, the aim of the present study was to perform a virtual screening of plant compounds and nonsteroidal anti-inflammatory drugs (NASIDs) for inhibition of quorum sensing by molecular docking and biofilm formation in Salmonella. In general, most plant compounds and all NSAIDs bound in, at least, one of the three modeled structures of SdiA proteins of Salmonella Enteritidis PT4 578. In addition, many tested compounds had higher binding affinities than the AHLs and the furanones which are inducers and inhibitors of quorum sensing, respectively. The Z-phytol and lonazolac molecules were good candidates for the in vitro inhibition tests of quorum sensing mediated by AI-1 and biofilm formation in Salmonella. Thus, this study directs future prospecting of plant extracts for inhibition of quorum sensing mechanism depending on AHL and biofilm formation. In addition, the use of inhibitors of quorum sensing and biofilm formation can be combined with antibiotics for better treatment efficacy, as well as the use of these compounds to design new drugs.
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Affiliation(s)
- Felipe Alves de Almeida
- Department of Microbiology, Universidade Federal de Viçosa, Viçosa, MG, Brazil; Department of Nutrition, Universidade Federal de Juiz de Fora, Governador Valadares, MG, Brazil
| | | | | | - Uelinton Manoel Pinto
- Food Research Center, Department of Food and Experimental Nutrition, Faculty of Pharmaceutical Sciences, Universidade de São Paulo, São Paulo, SP, Brazil
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145
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Pattnaik SS, Ranganathan S, Ampasala DR, Syed A, Ameen F, Busi S. Attenuation of quorum sensing regulated virulence and biofilm development in Pseudomonas aeruginosa PAO1 by Diaporthe phaseolorum SSP12. Microb Pathog 2018; 118:177-189. [PMID: 29571725 DOI: 10.1016/j.micpath.2018.03.031] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Revised: 03/16/2018] [Accepted: 03/19/2018] [Indexed: 10/17/2022]
Abstract
In recent years, Pseudomonas aeruginosa PAO1 emerged as the significant pathogenic microorganism in majority of the hospital-acquired infections due to its resistance to the conventional antibiotics by virtue of its highly organized quorum sensing and associated biofilm formation. In the present study, quorum sensing attenuation potential of Diaporthe phaseolorum SSP12 extract was investigated against P. aeruginosa PAO1 amply supported by molecular docking studies. D. phaseolorum SSP12 extract significantly inhibited the production of LasI/R mediated LasA protease, LasB elastase and chitinase with 66.52 ± 5.41, 71.26 ± 4.58 and 61.16 ± 4.28% of inhibition respectively at a concentration of 750 μg mL-1. In addition, RhlI/R mediated production of pyocyanin, exopolysaccharides and rhamnolipids were also down-regulated by 74.71 ± 3.97, 66.41 ± 3.62 and 63.75 ± 3.76% respectively on treatment with sub-MIC concentration of D. phaseolorum SSP12. The light, fluorescence and confocal laser scanning microscopic (CLSM) analysis confirmed the significant disruption in biofilm formation. The presence of bioactive constituents such as phenyl ethylalcohol, 2, 4-di-tert-butylphenol, fenaclon, 1, 4-phenylenediacetic acid, and benzyl hydrazine in D. phaseolorum SSP12 extract was evident from Gas chromatography-mass spectrophotometric (GC-MS) analysis. From the in silico molecular docking studies, fenaclon and 2, 4-di-tert-butylphenol competitively binds to QS receptors LasR and RhlR and alters the binding of its cognate ligands and modulates the expression of virulence phenotypes. The promising anti quorum sensing efficacy of D. phaseolorum SSP12 extract suggested new avenues for development of anti-infective drugs from fungal derived metabolites to counteract the problems associated with conventional antibiotic therapies.
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Affiliation(s)
- Subha Swaraj Pattnaik
- Department of Microbiology, School of Life Sciences, Pondicherry University, Puducherry 605 014, India
| | - SampathKumar Ranganathan
- Centre for Bioinformatics, School of Life Sciences, Pondicherry University, Puducherry 605 014, India
| | - Dinakara Rao Ampasala
- Centre for Bioinformatics, School of Life Sciences, Pondicherry University, Puducherry 605 014, India
| | - Asad Syed
- Botany and Microbiology Department, College of Science, King Saud University, P.O. 2455, Riyadh 11451, Saudi Arabia
| | - Fuad Ameen
- Botany and Microbiology Department, College of Science, King Saud University, P.O. 2455, Riyadh 11451, Saudi Arabia
| | - Siddhardha Busi
- Department of Microbiology, School of Life Sciences, Pondicherry University, Puducherry 605 014, India.
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146
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Kushwaha M, Jain SK, Sharma N, Abrol V, Jaglan S, Vishwakarma RA. Establishment of LCMS Based Platform for Discovery of Quorum Sensing Inhibitors: Signal Detection in Pseudomonas aeruginosa PAO1. ACS Chem Biol 2018; 13:657-665. [PMID: 29303546 DOI: 10.1021/acschembio.7b00875] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Targeting the main three networking systems, viz. Las, RhI, and PQS, via natural quenchers is a new ray of hope for combating the persistent behavior of Pseudomonas aeruginosa. In the bacterial chemical vocabulary pyocyanin, N-AHLs and rhamnolipids are the main keywords, which are responsible for the social and nomadic behavior of P. aeruginosa. In the present work, LC-MS based real-time qualitative and quantitative analysis of pyocyanin, green phenazine, N-AHLs, and rhamnolipids were performed on P. aeruginosa PAO1. The quantitative analysis indicates that the production of pyocyanin and NHSLs increases with time while the production of rhamnolipids discontinued after 16 h. This indicates the emergence of persisters in the medium instead of planktonic cells. Rhamnolipids acting as a surfactant enhances the motility of the bacterial cells, whereas the pyocyanin is responsible for the biofilm formation. In a microtiter plate based assay, an effect of capsaicin and 6-gingerol was recorded. In the presence of capsaicin and 6-gingerol, a substantial decrease in the production of rhamnolipids, phenazine, quinolone, and N-AHLs was observed. Most interestingly, the 6-gingerol treatment led to a drastic decrease of rhamnolipids, phenazine, quinolone, and N-AHLs versus capsaicin. These studies demonstrate the effectiveness of the capsaicin and 6-gingerol on Las, PQS, and Rhl circuits in a bacterium in order to understand the persistent and social behavior. Here, we are reporting LC-MS/MS based qualitative and quantitative analysis of QS molecules by taking a low volume of culture (up to 200 μL). This method can be used as a platform to screen the new antivirulence agents for fighting the resistant behavior of P. aeruginosa during biofilm formation.
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Affiliation(s)
- Manoj Kushwaha
- Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu-180001, India
- Department of Biotechnology, Guru Nanak Dev University, Amritsar-143001, Punjab, India
| | - Shreyans K. Jain
- Natural Product Chemistry Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu-180001, India
| | - Nisha Sharma
- Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu-180001, India
- Academy of Scientific and Innovative Research, Jammu Campus, Jammu-180001, India
| | - Vidushi Abrol
- Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu-180001, India
| | - Sundeep Jaglan
- Microbial Biotechnology Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu-180001, India
- Academy of Scientific and Innovative Research, Jammu Campus, Jammu-180001, India
| | - Ram A. Vishwakarma
- Medicinal Chemistry Division, Indian Institute of Integrative Medicine (CSIR), Canal Road, Jammu-180001, India
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147
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Zhou JW, Luo HZ, Jiang H, Jian TK, Chen ZQ, Jia AQ. Hordenine: A Novel Quorum Sensing Inhibitor and Antibiofilm Agent against Pseudomonas aeruginosa. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2018; 66:1620-1628. [PMID: 29353476 DOI: 10.1021/acs.jafc.7b05035] [Citation(s) in RCA: 130] [Impact Index Per Article: 21.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Abstract
The quorum sensing (QS) inhibitory activity of hordenine from sprouting barley against foodborne pathogen Pseudomonas aeruginosa was evaluated for the first time here. At concentrations ranging from 0.5 to 1.0 mg mL-1, hordenine inhibited the levels of acyl-homoserine lactones. The enhanced susceptibility of hordenine with netilmicin on P. aeruginosa PAO1 biofilm formation as well as their efficiency in disrupting preformed biofilms was also evaluated using scanning electron microscopy and confocal laser scanning microscopy (CLSM). Hordenine treatment inhibited the production of QS-related extracellular virulence factors of P. aeruginosa PAO1. Additionally, quantitative real-time polymerase chain reaction analysis demonstrated that the expressions of QS-related genes, lasI, lasR, rhlI, and rhlR, were significantly suppressed. Our results indicated that hordenine can serve as a competitive inhibitor for signaling molecules and act as a novel QS-based agent to defend against foodborne pathogens.
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Affiliation(s)
- Jin-Wei Zhou
- State Key Laboratory of Marine Resource Utilization in South China Sea, Key Laboratory of Tropical Biological Resources of Ministry Education, Hainan University , Haikou 570228, China
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Huai-Zhi Luo
- State Key Laboratory of Marine Resource Utilization in South China Sea, Key Laboratory of Tropical Biological Resources of Ministry Education, Hainan University , Haikou 570228, China
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Huan Jiang
- State Key Laboratory of Marine Resource Utilization in South China Sea, Key Laboratory of Tropical Biological Resources of Ministry Education, Hainan University , Haikou 570228, China
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Ting-Kun Jian
- State Key Laboratory of Marine Resource Utilization in South China Sea, Key Laboratory of Tropical Biological Resources of Ministry Education, Hainan University , Haikou 570228, China
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Zi-Qian Chen
- State Key Laboratory of Marine Resource Utilization in South China Sea, Key Laboratory of Tropical Biological Resources of Ministry Education, Hainan University , Haikou 570228, China
- School of Environmental and Biological Engineering, Nanjing University of Science and Technology , Nanjing 210094, China
| | - Ai-Qun Jia
- State Key Laboratory of Marine Resource Utilization in South China Sea, Key Laboratory of Tropical Biological Resources of Ministry Education, Hainan University , Haikou 570228, China
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148
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Vijayababu P, Samykannu G, Antonyraj CB, Thomas J, Narayanan S, Basheer Ahamed SI, Piramanayagam S. Patulin interference with ATP binding cassette transferring auto inducer −2 in Salmonella typhi and biofilm inhibition via quorum sensing. INFORMATICS IN MEDICINE UNLOCKED 2018. [DOI: 10.1016/j.imu.2018.02.001] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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149
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Nagraj AK, Gokhale D. Bacterial Biofilm Degradation Using Extracellular Enzymes Produced by <i>Penicillium janthinellum</i> EU2D-21 under Submerged Fermentation. ACTA ACUST UNITED AC 2018. [DOI: 10.4236/aim.2018.89046] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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150
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Choi H, Ham SY, Cha E, Shin Y, Kim HS, Bang JK, Son SH, Park HD, Byun Y. Structure–Activity Relationships of 6- and 8-Gingerol Analogs as Anti-Biofilm Agents. J Med Chem 2017; 60:9821-9837. [DOI: 10.1021/acs.jmedchem.7b01426] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Hyunsuk Choi
- College
of Pharmacy, Korea University, 2511 Sejong-ro,
Jochiwon-eup, Sejong 30019, Republic of Korea
| | - So-Young Ham
- School
of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-Gu, Seoul 02841, Republic of Korea
| | - Eunji Cha
- School
of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-Gu, Seoul 02841, Republic of Korea
| | - Yujin Shin
- College
of Pharmacy, Korea University, 2511 Sejong-ro,
Jochiwon-eup, Sejong 30019, Republic of Korea
| | - Han-Shin Kim
- School
of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-Gu, Seoul 02841, Republic of Korea
| | - Jeong Kyu Bang
- Division
of Magnetic Resonance, Korea Basic Science Institute, 161 Yeongudanji-ro,
Ochang-eup, Cheongwon-gu, Cheongju-si, Chungcheongbuk-do 28119, Republic of Korea
- Department of Bio-analytical Science, University of Science & Technology, Daejeon 34113, Republic of Korea
| | - Sang-Hyun Son
- College
of Pharmacy, Korea University, 2511 Sejong-ro,
Jochiwon-eup, Sejong 30019, Republic of Korea
| | - Hee-Deung Park
- School
of Civil, Environmental and Architectural Engineering, Korea University, 145 Anam-ro, Seongbuk-Gu, Seoul 02841, Republic of Korea
- KU-KIST
Graduate School of Converging Science and Technology, Korea University, 145
Anam-ro, Seongbuk-Gu, Seoul 02841, Republic of Korea
| | - Youngjoo Byun
- College
of Pharmacy, Korea University, 2511 Sejong-ro,
Jochiwon-eup, Sejong 30019, Republic of Korea
- Biomedical
Research Center, Korea University Guro Hospital, 148 Gurodong-ro, Guro-gu, Seoul 08308, Republic of Korea
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