151
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Quorum quenching agents: resources for antivirulence therapy. Mar Drugs 2014; 12:3245-82. [PMID: 24886865 PMCID: PMC4071575 DOI: 10.3390/md12063245] [Citation(s) in RCA: 99] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2014] [Revised: 05/07/2014] [Accepted: 05/09/2014] [Indexed: 12/15/2022] Open
Abstract
The continuing emergence of antibiotic-resistant pathogens is a concern to human health and highlights the urgent need for the development of alternative therapeutic strategies. Quorum sensing (QS) regulates virulence in many bacterial pathogens, and thus, is a promising target for antivirulence therapy which may inhibit virulence instead of cell growth and division. This means that there is little selective pressure for the evolution of resistance. Many natural quorum quenching (QQ) agents have been identified. Moreover, it has been shown that many microorganisms are capable of producing small molecular QS inhibitors and/or macromolecular QQ enzymes, which could be regarded as a strategy for bacteria to gain benefits in competitive environments. More than 30 species of marine QQ bacteria have been identified thus far, but only a few of them have been intensively studied. Recent studies indicate that an enormous number of QQ microorganisms are undiscovered in the highly diverse marine environments, and these marine microorganism-derived QQ agents may be valuable resources for antivirulence therapy.
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152
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Lade H, Paul D, Kweon JH. Quorum quenching mediated approaches for control of membrane biofouling. Int J Biol Sci 2014; 10:550-65. [PMID: 24910534 PMCID: PMC4046882 DOI: 10.7150/ijbs.9028] [Citation(s) in RCA: 100] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Accepted: 04/29/2014] [Indexed: 12/24/2022] Open
Abstract
Membrane biofouling is widely acknowledged as the most frequent adverse event in wastewater treatment systems resulting in significant loss of treatment efficiency and economy. Different strategies including physical cleaning and use of antimicrobial chemicals or antibiotics have been tried for reducing membrane biofouling. Such traditional practices are aimed to eradicate biofilms or kill the bacteria involved, but the greater efficacy in membrane performance would be achieved by inhibiting biofouling without interfering with bacterial growth. As a result, the search for environmental friendly non-antibiotic antifouling strategies has received much greater attention among scientific community. The use of quorum quenching natural compounds and enzymes will be a potential approach for control of membrane biofouling. This approach has previously proven useful in diseases and membrane biofouling control by triggering the expression of desired phenotypes. In view of this, the present review is provided to give the updated information on quorum quenching compounds and elucidate the significance of quorum sensing inhibition in control of membrane biofouling.
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Affiliation(s)
| | - Diby Paul
- Department of Environmental Engineering, Konkuk University, Seoul-143-701, Korea
| | - Ji Hyang Kweon
- Department of Environmental Engineering, Konkuk University, Seoul-143-701, Korea
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153
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Gholami A, De Geyter N, Pollier J, Goormachtig S, Goossens A. Natural product biosynthesis in Medicago species. Nat Prod Rep 2014; 31:356-80. [PMID: 24481477 DOI: 10.1039/c3np70104b] [Citation(s) in RCA: 65] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
The genus Medicago, a member of the legume (Fabaceae) family, comprises 87 species of flowering plants, including the forage crop M. sativa (alfalfa) and the model legume M. truncatula (barrel medic). Medicago species synthesize a variety of bioactive natural products that are used to engage into symbiotic interactions but also serve to deter pathogens and herbivores. For humans, these bioactive natural products often possess promising pharmaceutical properties. In this review, we focus on the two most interesting and well characterized secondary metabolite classes found in Medicago species, the triterpene saponins and the flavonoids, with a detailed overview of their biosynthesis, regulation, and profiling methods. Furthermore, their biological role within the plant as well as their potential utility for human health or other applications is discussed. Finally, we give an overview of the advances made in metabolic engineering in Medicago species and how the development of novel molecular and omics toolkits can influence a better understanding of this genus in terms of specialized metabolism and chemistry. Throughout, we critically analyze the current bottlenecks and speculate on future directions and opportunities for research and exploitation of Medicago metabolism.
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Affiliation(s)
- Azra Gholami
- Department of Plant Systems Biology, VIB, Ghent University, Technologiepark 927, B-9052 Gent, Belgium.
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154
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Park SJ, Lee YH, Lee KH, Kim TJ. Effect of eriodictyol on the development of atopic dermatitis-like lesions in ICR mice. Biol Pharm Bull 2014; 36:1375-9. [PMID: 23902981 DOI: 10.1248/bpb.b13-00296] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Atopic dermatitis (AD) is a chronic, allergic, and inflammatory skin disease associated with eczema and dermatitis symptoms. Our previous studies have reported that eriodictyol extract inhibits immunoglobulin E (IgE)/Ag-induced type I hypersensitivity by suppressing the activation of proinflammatory cytokines, such as interleukin-4 (IL-4), and the expression of ceramide kinase. In this study, we investigated the inhibitory effect of eriodictyol on 2,4-dinitrochlorobenzene (DNCB)-induced AD-like skin lesions in ICR mice. Treatment with 2 mg/mL eriodictyol for DNCB-induced AD-like skin lesions in ICR mice improved scratching behavior and skin severity score. Histological analysis demonstrated that thickening of the skin lesions were significantly reduced in the eriodictyol-treated group. Also, eriodictyol suppressed the DNCB-mediated elevation of IgE serum levels. These results suggest that eriodictyol may be a potential therapeutic resource for AD and an adjunctive agent to control itchiness in AD.
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Affiliation(s)
- Sae-Jin Park
- Division of Biological Science and Technology, College of Science and Technology, Yonsei University, Wonju 220–710, Korea
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155
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Beury-Cirou A, Tannières M, Minard C, Soulère L, Rasamiravaka T, Dodd RH, Queneau Y, Dessaux Y, Guillou C, Vandeputte OM, Faure D. At a supra-physiological concentration, human sexual hormones act as quorum-sensing inhibitors. PLoS One 2013; 8:e83564. [PMID: 24376718 PMCID: PMC3871529 DOI: 10.1371/journal.pone.0083564] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Accepted: 11/13/2013] [Indexed: 01/06/2023] Open
Abstract
N-Acylhomoserine lactone (AHL)-mediated quorum-sensing (QS) regulates virulence functions in plant and animal pathogens such as Agrobacterium tumefaciens and Pseudomonas aeruginosa. A chemolibrary of more than 3500 compounds was screened using two bacterial AHL-biosensors to identify QS-inhibitors (QSIs). The purity and structure of 15 QSIs selected through this screening were verified using HPLC MS/MS tools and their activity tested on the A. tumefaciens and P. aeruginosa bacterial models. The IC50 value of the identified QSIs ranged from 2.5 to 90 µg/ml, values that are in the same range as those reported for the previously identified QSI 4-nitropyridine-N-oxide (IC50 24 µg/ml). Under the tested culture conditions, most of the identified QSIs did not exhibit bacteriostatic or bactericidal activities. One third of the tested QSIs, including the plant compound hordenine and the human sexual hormone estrone, decreased the frequency of the QS-regulated horizontal transfer of the tumor-inducing (Ti) plasmid in A. tumefaciens. Hordenine, estrone as well as its structural relatives estriol and estradiol, also decreased AHL accumulation and the expression of six QS-regulated genes (lasI, lasR, lasB, rhlI, rhlR, and rhlA) in cultures of the opportunist pathogen P. aeruginosa. Moreover, the ectopic expression of the AHL-receptors RhlR and LasR of P. aeruginosa in E. coli showed that their gene-regulatory activity was affected by the QSIs. Finally, modeling of the structural interactions between the human hormones and AHL-receptors LasR of P. aeruginosa and TraR of A. tumefaciens confirmed the competitive binding capability of the human sexual hormones. This work indicates potential interferences between bacterial and eukaryotic hormonal communications.
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Affiliation(s)
- Amélie Beury-Cirou
- Institut des Sciences du Végétal (ISV) UPR 2355, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France
- Seeds Innovation Protection Research and Environment (SIPRE), Comité Nord Plants de Pommes de Terre (CNPPT), Achicourt, France
| | - Mélanie Tannières
- Institut des Sciences du Végétal (ISV) UPR 2355, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France
| | - Corinne Minard
- Institut de Chimie des Substances Naturelles (ICSN) UPR2301, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France
| | - Laurent Soulère
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires (ICBMS) UMR 5246, INSA Lyon-Université Lyon 1, Villeurbanne, France
| | - Tsiry Rasamiravaka
- Laboratoire de Biotechnologie Végétale, Université Libre de Bruxelles, Gosselies, Belgium
| | - Robert H. Dodd
- Institut de Chimie des Substances Naturelles (ICSN) UPR2301, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France
| | - Yves Queneau
- Institut de Chimie et Biochimie Moléculaires et Supramoléculaires (ICBMS) UMR 5246, INSA Lyon-Université Lyon 1, Villeurbanne, France
| | - Yves Dessaux
- Institut des Sciences du Végétal (ISV) UPR 2355, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France
| | - Catherine Guillou
- Institut de Chimie des Substances Naturelles (ICSN) UPR2301, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France
| | - Olivier M. Vandeputte
- Laboratoire de Biotechnologie Végétale, Université Libre de Bruxelles, Gosselies, Belgium
- * E-mail: (OV); (DF)
| | - Denis Faure
- Institut des Sciences du Végétal (ISV) UPR 2355, Centre National de la Recherche Scientifique, Gif-sur-Yvette, France
- * E-mail: (OV); (DF)
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156
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Defoirdt T, Brackman G, Coenye T. Quorum sensing inhibitors: how strong is the evidence? Trends Microbiol 2013; 21:619-24. [DOI: 10.1016/j.tim.2013.09.006] [Citation(s) in RCA: 94] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2013] [Revised: 09/16/2013] [Accepted: 09/19/2013] [Indexed: 10/26/2022]
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157
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Vargas P, Farias GA, Nogales J, Prada H, Carvajal V, Barón M, Rivilla R, Martín M, Olmedilla A, Gallegos MT. Plant flavonoids target Pseudomonas syringae pv. tomato DC3000 flagella and type III secretion system. ENVIRONMENTAL MICROBIOLOGY REPORTS 2013; 5:841-50. [PMID: 24249293 DOI: 10.1111/1758-2229.12086] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/04/2013] [Accepted: 07/10/2013] [Indexed: 05/23/2023]
Abstract
Flavonoids are among the most abundant plant secondary metabolites involved in plant protection against pathogens, but micro-organisms have developed resistance mechanisms to those compounds. We previously demonstrated that the MexAB-OprM efflux pump mediates resistance of Pseudomonas syringae pv. tomato (Pto) DC3000 to flavonoids, facilitating its survival and the colonization of the host. Here, we have shown that tomato plants respond to Pto infection producing flavonoids and other phenolic compounds. The effects of flavonoids on key traits of this model plant-pathogen bacterium have also been investigated observing that they reduce Pto swimming and swarming because of the loss of flagella, and also inhibited the expression and assembly of a functional type III secretion system. Those effects were more severe in a mutant lacking the MexAB-OprM pump. Our results suggest that flavonoids inhibit the function of the GacS/GacA two-component system, causing a depletion of rsmY RNA, therefore affecting the synthesis of two important virulence factors in Pto DC3000, flagella and the type III secretion system. These data provide new insights into the flavonoid role in the molecular dialog between host and pathogen.
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Affiliation(s)
- Paola Vargas
- Department of Soil Microbiology and Symbiotic Systems, Estación Experimental del Zaidín (EEZ-CSIC), Granada, Spain
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158
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Husain FM, Ahmad I, Asif M, Tahseen Q. Influence of clove oil on certain quorum-sensing-regulated functions and biofilm of Pseudomonas aeruginosa and Aeromonas hydrophila. J Biosci 2013; 38:835-44. [DOI: 10.1007/s12038-013-9385-9] [Citation(s) in RCA: 93] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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159
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Nazzaro F, Fratianni F, Coppola R. Quorum sensing and phytochemicals. Int J Mol Sci 2013; 14:12607-19. [PMID: 23774835 PMCID: PMC3709803 DOI: 10.3390/ijms140612607] [Citation(s) in RCA: 124] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2013] [Revised: 05/31/2013] [Accepted: 06/04/2013] [Indexed: 01/15/2023] Open
Abstract
Most infectious diseases are caused by bacteria, which proliferate within quorum sensing (QS)-mediated biofilms. Efforts to block QS in bacteria and disrupt biofilms have enabled the identification of bioactive molecules that are also produced by plants. This mini review primarily focuses on natural QS inhibitors, which display potential for treating bacterial infections and also enhance the safety of food supply.
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Affiliation(s)
- Filomena Nazzaro
- Institute of Food Science, ISA-CNR, Via Roma 64, Avellino 83100, Italy.
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160
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Nagant C, Seil M, Nachtergael A, Dulanto S, Dehaye JP. Contribution of the production of quormones to some phenotypic characteristics of Pseudomonas aeruginosa clinical strains. J Med Microbiol 2013; 62:951-958. [PMID: 23538560 DOI: 10.1099/jmm.0.050807-0] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
Abstract
The contribution of quorum sensing in some phenotypic and pathogenic characteristics of Pseudomonas aeruginosa was studied. The production of acylhomoserine lactones (AHL) by planktonic cultures of eight clinical and reference strains of P. aeruginosa was evaluated using two biosensors. The adhesion of the bacteria on a surface (Biofilm Ring Test ®, BFRT), their capacity to develop a biofilm (crystal violet staining method, CVSM), their sensitivity to tobramycin and their secretion of proteases or of rhamnolipids were also measured. The production and the release of AHL widely varied among the eight strains. An analysis of the extracts by TLC showed that 3-oxo-C8-HSL, 3-oxo-C10-HSL and 3-oxo-C12-HSL were released by the five strains producing the highest amount of Cn≥6-HSL. The genes lasI and lasR involved in the synthesis and response to 3-oxo-C12-HSL were detected in the genomes of all strains. Two clinical strains had deletions in the lasR gene leading to truncation of the protein. One subpopulation of the PAO1 strain had a major deletion (98 bp) of the lasR gene. Strains with significant mutations of lasR secreted the lowest amount of AHL, probably due to deficiencies in the self-induction and amplification of the synthesis of the lactone. These strains formed a biofilm with low biomass. C4-HSL production also differed among the strains and was correlated with rhamnolipid production and biofilm formation. Whereas the production of AHL varied among P. aeruginosa strains, few correlations were observed with their phenotypic properties except with their ability to form a biofilm.
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Affiliation(s)
- C Nagant
- Laboratoire de Chimie biologique et médicale et de Microbiologie pharmaceutique, Faculté de Pharmacie, Université libre de Bruxelles, Brussels, Belgium
| | - M Seil
- Laboratoire de Chimie biologique et médicale et de Microbiologie pharmaceutique, Faculté de Pharmacie, Université libre de Bruxelles, Brussels, Belgium
| | - A Nachtergael
- Laboratoire de Chimie biologique et médicale et de Microbiologie pharmaceutique, Faculté de Pharmacie, Université libre de Bruxelles, Brussels, Belgium
| | - S Dulanto
- Laboratoire de Chimie biologique et médicale et de Microbiologie pharmaceutique, Faculté de Pharmacie, Université libre de Bruxelles, Brussels, Belgium
| | - J P Dehaye
- Laboratoire de Chimie biologique et médicale et de Microbiologie pharmaceutique, Faculté de Pharmacie, Université libre de Bruxelles, Brussels, Belgium
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161
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Rasamiravaka T, Jedrzejowski A, Kiendrebeogo M, Rajaonson S, Randriamampionona D, Rabemanantsoa C, Andriantsimahavandy A, Rasamindrakotroka A, Duez P, El Jaziri M, Vandeputte OM. Endemic malagasy Dalbergia species inhibit quorum sensing in Pseudomonas aeruginosa PAO1. MICROBIOLOGY-SGM 2013; 159:924-938. [PMID: 23449917 DOI: 10.1099/mic.0.064378-0] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Various species of the plant genus Dalbergia are traditionally used as medicine for sundry ailments and some of them have been shown recently to quench the virulence of Gram-positive and Gram-negative bacteria. Cell-to-cell communication mechanisms, quorum sensing (QS) in particular, are key regulators of virulence in many pathogenic bacteria. Screening n-hexane extracts of leaves, roots and bark of endemic Malagasy Dalbergia species for their capacity to antagonize QS mechanisms in Pseudomonas aeruginosa PAO1 showed that many reduced the expression of the QS-regulated genes lasB and rhlA. However, only the extract of Dalbergia trichocarpa bark (DTB) showed a significant reduction of QS gene expression without any effect on the aceA gene encoding a QS-independent isocitrate lyase. Further characterization of DTB impact on QS revealed that the QS systems las and rhl are inhibited and that swarming, twitching, biofilm formation and the production of pyocyanin, elastase and proteases are also hampered in the presence of the DTB extract. Importantly, compared with the known QS inhibitor naringenin, the DTB extract showed a stronger negative effect on twitching, biofilm formation and tobramycin resistance. Preliminary structural characterization of these potent biofilm disrupters suggests that they belong to the phytosterols. The strong inhibition of motility and biofilm formation suggests that the DTB extract contains agents disrupting biofilm architecture, which is an important observation in the context of the design of new drugs targeting biofilm-encapsulated pathogens.
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Affiliation(s)
- Tsiry Rasamiravaka
- Laboratoire de Formation et de Recherche en Biologie Médicale, Université d'Antananarivo, B.P. 566 Antananarivo 101, Madagascar.,Laboratoire de Biotechnologie Végétale, Université Libre de Bruxelles, 12 rue des Professeurs Jeener et Brachet, B-6041 Gosselies, Belgium
| | - Anaïs Jedrzejowski
- Laboratoire de Biotechnologie Végétale, Université Libre de Bruxelles, 12 rue des Professeurs Jeener et Brachet, B-6041 Gosselies, Belgium
| | - Martin Kiendrebeogo
- Laboratoire de Biochimie et de Chimie Appliquées, Université de Ouagadougou, 09 BP 848 Ouagadougou 09, Burkina Faso.,Laboratoire de Biotechnologie Végétale, Université Libre de Bruxelles, 12 rue des Professeurs Jeener et Brachet, B-6041 Gosselies, Belgium
| | - Sanda Rajaonson
- Laboratoire de Physiologie Végétale, Université d'Antananarivo, B.P. 906 Antananarivo 101, Madagascar.,Laboratoire de Biotechnologie Végétale, Université Libre de Bruxelles, 12 rue des Professeurs Jeener et Brachet, B-6041 Gosselies, Belgium
| | - Denis Randriamampionona
- Laboratoire de Physiologie Végétale, Université d'Antananarivo, B.P. 906 Antananarivo 101, Madagascar.,Laboratoire de Biotechnologie Végétale, Université Libre de Bruxelles, 12 rue des Professeurs Jeener et Brachet, B-6041 Gosselies, Belgium
| | - Christian Rabemanantsoa
- Laboratoire de Biodiversité et de Biotechnologie, Institut Malgache de Recherches Appliquées (IMRA), B.P. 3833 Avarabohitra Itaosy, Antananarivo 102, Madagascar
| | - Abel Andriantsimahavandy
- Laboratoire de Formation et de Recherche en Biologie Médicale, Université d'Antananarivo, B.P. 566 Antananarivo 101, Madagascar
| | - Andry Rasamindrakotroka
- Laboratoire de Formation et de Recherche en Biologie Médicale, Université d'Antananarivo, B.P. 566 Antananarivo 101, Madagascar
| | - Pierre Duez
- Laboratoire de Pharmacognosie, de Bromatologie et de Nutrition Humaine, Université Libre de Bruxelles, CP 205/9, Boulevard du Triomphe, B-1050 Brussels, Belgium
| | - Mondher El Jaziri
- Laboratoire de Biotechnologie Végétale, Université Libre de Bruxelles, 12 rue des Professeurs Jeener et Brachet, B-6041 Gosselies, Belgium
| | - Olivier M Vandeputte
- Laboratoire de Biotechnologie Végétale, Université Libre de Bruxelles, 12 rue des Professeurs Jeener et Brachet, B-6041 Gosselies, Belgium
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162
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Truchado P, Giménez-Bastida JA, Larrosa M, Castro-Ibáñez I, Espín JC, Tomás-Barberán FA, García-Conesa MT, Allende A. Inhibition of quorum sensing (QS) in Yersinia enterocolitica by an orange extract rich in glycosylated flavanones. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2012; 60:8885-8894. [PMID: 22533445 DOI: 10.1021/jf301365a] [Citation(s) in RCA: 87] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Flavanones, flavonoids abundant in Citrus , have been shown to interfere with quorum sensing (QS) and affect related physiological processes. We have investigated the QS-inhibitory effects of an orange extract enriched in O-glycosylated flavanones (mainly naringin, neohesperidin, and hesperidin). The QS-inhibitory capacity of this extract and its main flavanone components was first screened using the bacteriological monitoring system Chromobacterium violaceum . We next examined the ability of the orange extract and of some of the flavanones to (i) reduce the levels of the QS mediators produced by Y. enterocolitica using HPLC-MS/MS, (ii) inhibit biofilm formation, and (iii) inhibit swimming and swarming motility. Additionally, we evaluated changes in the expression of specific genes involved in the synthesis of the lactones (yenI, yenR) and in the flagellar regulon (flhDC, fleB, fliA) by RT-PCR. The results showed that the orange extract and its main flavanone components inhibited QS in C. violaceum, diminished the levels of lactones secreted by Y. enterocolitica to the media, and decreased QS-associated biofilm maturation without affecting bacterial growth. Among the tested compounds, naringin was found to inhibit swimming motility. Exposure to the orange extract and (or) to naringin was also found to be associated with induction of the transcription levels of yenR, flhDC, and fliA. This work shows the in vitro QS-inhibitory effects of an orange extract enriched in flavanones against a human enteropathogen at doses that can be achieved through the diet and suggests that consumption of these natural extracts may have a beneficial antipathogenic effect.
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Affiliation(s)
- Pilar Truchado
- Research Group on Quality, Safety and Bioactivity of Plant Foods, Department of Food Science and Technology, CEBAS-CSIC , P.O. Box 164, 30100 Campus de Espinardo, Murcia, Spain
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163
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Inhibitory effect of eriodictyol on IgE/Ag-induced type I hypersensitivity. Biosci Biotechnol Biochem 2012; 76:1285-90. [PMID: 22785465 DOI: 10.1271/bbb.110952] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Mast cells are the principal effector cells involved in the allergic response, through the release of histamine. We investigated the effect of eriodictyol, derived from the painted maple and yerba santa, on mast cell degranulation and on an allergic response in an animal model. We also investigated its effect on the expression of the ceramide kinase (CERK) involved in calcium-dependent degranulation, and on ceramide activation by multiple cytokines. Eriodictyol suppressed the release of beta-hexosaminidase, a marker of degranulation, and the expression of interleukin (IL)-4 mRNA. It inhibited the expression of CERK mRNA, reduced the ceramide concentration in antigen-stimulated mast cells, and suppressed the passive cutaneous anaphylaxis (PCA) reaction in mice in a dose-dependent manner. These results suggest that eriodictyol can inhibit mast cell degranulation through inhibition of ceramide kinase, and that it might potentially serve as an anti-allergic agent.
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164
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Musthafa KS, Balamurugan K, Pandian SK, Ravi AV. 2,5-Piperazinedione inhibits quorum sensing-dependent factor production in Pseudomonas aeruginosa PAO1. J Basic Microbiol 2012; 52:679-86. [PMID: 22359266 DOI: 10.1002/jobm.201100292] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2011] [Accepted: 09/30/2011] [Indexed: 12/15/2022]
Abstract
The effects of 2,5-piperazinedione in reducing the production of quorum sensing (QS)-dependent factors in Pseudomonas aeruginosa PAO1 were assessed both in vitro and in vivo. 2,5-Piperazinedione exhibited a 69% reduction in the azocasein-degrading proteolytic activity and a 48% reduction in the elastolytic activity of PAO1. Further, it showed 85% and 96% reduction in the production of pyocyanin and extracellular polymeric substances (EPS) of PAO1, respectively. In the swimming inhibition assay, 2,5-piperazinedione-treated PAO1 cells exhibited poor swimming motility in swim agar medium. In the in vivo analysis, an enhanced survival of PAO1-preinfected Caenorhabditis elegans was observed after treatment with 2,5-piperazinedione. Regarding the mode of action, in the molecular docking analysis, 2,5-piperazinedione interacts with the amino acid residue of the LasR receptor protein required for binding the natural ligand N -3-oxododecanoyl-l-homoserine lactone (3-oxo-C12-HSL). This demonstrates the probability of 2,5-piperazinedione to interfere with the binding process of 3-oxo-C12-HSL to its receptor protein. Thus, the findings of the present study reveal the potential of 2,5-piperazinedione in reducing the QS-dependent phenotypic features of PAO1.
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