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Articoli di riviste sul tema "Quorum sensing"

Autore: Grafiati
Pubblicato: 4 giugno 2021
Ultima modifica: 7 luglio 2024

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1

Sahu, Dr Babita, Dr Srikanth Guduguntla, Dr Sachin B. Mangalekar, Dr Sunaina Shetty, Dr Priyanka Thakur e Dr Supriya Mishra. "Quorum Sensing and Quorum Quenching Facebook of Microbial World". International Journal of Scientific Research 3, n. 2 (1 giugno 2012): 423–26. http://dx.doi.org/10.15373/22778179/feb2014/139.

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Hentzer, Morten, Leo Eberl, John Nielsen e Michael Givskov. "Quorum Sensing". BioDrugs 17, n. 4 (2003): 241–50. http://dx.doi.org/10.2165/00063030-200317040-00003.

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3

Marshall, J. "Quorum sensing". Proceedings of the National Academy of Sciences 110, n. 8 (1 febbraio 2013): 2690. http://dx.doi.org/10.1073/pnas.1301432110.

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Lal, Avantika. "Quorum sensing". Resonance 14, n. 9 (settembre 2009): 866–71. http://dx.doi.org/10.1007/s12045-009-0082-9.

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Williams, Paul. "Quorum sensing". International Journal of Medical Microbiology 296, n. 2-3 (aprile 2006): 57–59. http://dx.doi.org/10.1016/j.ijmm.2006.01.034.

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6

Wackett, Lawrence P. "Quorum sensing". Environmental Microbiology 10, n. 10 (10 settembre 2008): 2899–900. http://dx.doi.org/10.1111/j.1462-2920.2008.01755.x.

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Diggle, Stephen P., Shanika A. Crusz e Miguel Cámara. "Quorum sensing". Current Biology 17, n. 21 (novembre 2007): R907—R910. http://dx.doi.org/10.1016/j.cub.2007.08.045.

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YUAN, ZongHui, ZhenLi LIU, MengHong DAI, HaiHong HAO e GuYue CHENG. "Quorum sensing of pathogenic bacteria and quorum-sensing inhibitors". Chinese Science Bulletin 57, n. 21 (1 luglio 2012): 1964–77. http://dx.doi.org/10.1360/972011-2465.

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Krom, Bastiaan P., Niva Levy, Michael M. Meijler e Mary Ann Jabra-Rizk. "Farnesol andCandida albicans: Quorum Sensing or Not Quorum Sensing?" Israel Journal of Chemistry 56, n. 5 (21 luglio 2015): 295–301. http://dx.doi.org/10.1002/ijch.201500025.

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Sperandio, Vanessa. "Illuminating quorum sensing". Trends in Microbiology 7, n. 12 (dicembre 1999): 481. http://dx.doi.org/10.1016/s0966-842x(99)01640-6.

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Van Houdt, Rob, Michael Givskov e Chris W. Michiels. "Quorum sensing inSerratia". FEMS Microbiology Reviews 31, n. 4 (luglio 2007): 407–24. http://dx.doi.org/10.1111/j.1574-6976.2007.00071.x.

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Wright, Patricia P., e Srinivas Sulugodu Ramachandra. "Quorum Sensing and Quorum Quenching with a Focus on Cariogenic and Periodontopathic Oral Biofilms". Microorganisms 10, n. 9 (3 settembre 2022): 1783. http://dx.doi.org/10.3390/microorganisms10091783.

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Numerous in vitro studies highlight the role of quorum sensing in the pathogenicity and virulence of biofilms. This narrative review discusses general principles in quorum sensing, including Gram-positive and Gram-negative models and the influence of flow, before focusing on quorum sensing and quorum quenching in cariogenic and periodontopathic biofilms. In cariology, quorum sensing centres on the role of Streptococcus mutans, and to a lesser extent Candida albicans, while Fusobacterium nucleatum and the red complex pathogens form the basis of the majority of the quorum sensing research on periodontopathic biofilms. Recent research highlights developments in quorum quenching, also known as quorum sensing inhibition, as a potential antimicrobial tool to attenuate the pathogenicity of oral biofilms by the inhibition of bacterial signalling networks. Quorum quenchers may be synthetic or derived from plant or bacterial products, or human saliva. Furthermore, biofilm inhibition by coating quorum sensing inhibitors on dental implant surfaces provides another potential application of quorum quenching technologies in dentistry. While the body of predominantly in vitro research presented here is steadily growing, the clinical value of quorum sensing inhibitors against in vivo oral polymicrobial biofilms needs to be ascertained.
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Conway, Barbara-Ann, e E. P. Greenberg. "Quorum-Sensing Signals and Quorum-Sensing Genes in Burkholderia vietnamiensis". Journal of Bacteriology 184, n. 4 (15 febbraio 2002): 1187–91. http://dx.doi.org/10.1128/jb.184.4.1187-1191.2002.

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ABSTRACT Acyl-homoserine lactone (acyl-HSL) quorum sensing is common to many Proteobacteria including a clinical isolate of Burkholderia cepacia. The B. cepacia isolate produces low levels of octanoyl-HSL. We have examined an environmental isolate of Burkholderia vietnamiensis. This isolate produced several acyl-HSLs. The most abundant species was decanoyl-HSL. Decanoyl-HSL in B. vietnamiensis cultures reached concentrations in excess of 20 μM. We isolated a B. vietnamiensis DNA fragment containing a gene for the synthesis of decanoyl-HSL (bviI) and an open reading frame that codes for a putative signal receptor (bviR). A B. vietnamiensis bviI mutant did not produce detectable levels of decanoyl-HSL.
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González, Juan E., e Neela D. Keshavan. "Messing with Bacterial Quorum Sensing". Microbiology and Molecular Biology Reviews 70, n. 4 (dicembre 2006): 859–75. http://dx.doi.org/10.1128/mmbr.00002-06.

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SUMMARY Quorum sensing is widely recognized as an efficient mechanism to regulate expression of specific genes responsible for communal behavior in bacteria. Several bacterial phenotypes essential for the successful establishment of symbiotic, pathogenic, or commensal relationships with eukaryotic hosts, including motility, exopolysaccharide production, biofilm formation, and toxin production, are often regulated by quorum sensing. Interestingly, eukaryotes produce quorum-sensing-interfering (QSI) compounds that have a positive or negative influence on the bacterial signaling network. This eukaryotic interference could result in further fine-tuning of bacterial quorum sensing. Furthermore, recent work involving the synthesis of structural homologs to the various quorum-sensing signal molecules has resulted in the development of additional QSI compounds that could be used to control pathogenic bacteria. The creation of transgenic plants that express bacterial quorum-sensing genes is yet another strategy to interfere with bacterial behavior. Further investigation on the manipulation of quorum-sensing systems could provide us with powerful tools against harmful bacteria.
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Kim, Tae-Woo, Ji-Young Cha, Jun-Seung Lee, Bok-Kee Min e Hyung-Suk Baik. "Detection of a Quorum-Sensing Inhibitor from the Natural Products". Journal of Life Science 18, n. 2 (28 febbraio 2008): 206–12. http://dx.doi.org/10.5352/jls.2008.18.2.206.

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Zingg, Jean-Marc A., e Sylvia Daunert. "From Quorum Sensing to Positional Sensing". FASEB Journal 34, S1 (aprile 2020): 1. http://dx.doi.org/10.1096/fasebj.2020.34.s1.02508.

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Keshavan, Neela D., Puneet K. Chowdhary, Donovan C. Haines e Juan E. González. "l-Canavanine Made by Medicago sativa Interferes with Quorum Sensing in Sinorhizobium meliloti". Journal of Bacteriology 187, n. 24 (15 dicembre 2005): 8427–36. http://dx.doi.org/10.1128/jb.187.24.8427-8436.2005.

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ABSTRACT Sinorhizobium meliloti is a gram-negative soil bacterium, capable of establishing a nitrogen-fixing symbiosis with its legume host, alfalfa (Medicago sativa). Quorum sensing plays a crucial role in this symbiosis, where it influences the nodulation process and the synthesis of the symbiotically important exopolysaccharide II (EPS II). S. meliloti has three quorum-sensing systems (Sin, Tra, and Mel) that use N-acyl homoserine lactones as their quorum-sensing signal molecule. Increasing evidence indicates that certain eukaryotic hosts involved in symbiotic or pathogenic relationships with gram-negative bacteria produce quorum-sensing-interfering (QSI) compounds that can cross-communicate with the bacterial quorum-sensing system. Our studies of alfalfa seed exudates suggested the presence of multiple signal molecules capable of interfering with quorum-sensing-regulated gene expression in different bacterial strains. In this work, we choose one of these QSI molecules (SWI) for further characterization. SWI inhibited violacein production, a phenotype that is regulated by quorum sensing in Chromobacterium violaceum. In addition, this signal molecule also inhibits the expression of the S. meliloti exp genes, responsible for the production of EPS II, a quorum-sensing-regulated phenotype. We identified this molecule as l-canavanine, an arginine analog, produced in large quantities by alfalfa and other legumes.
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Geethanjali, V. Dinesh Kumar, N. Raghu, T. S. Gopenath, S. Veerana Gowda, K. W. Ong, M. S. Ranjith et al. "Quorum sensing: A molecular cell communication in bacterial cells". Journal of Biomedical Sciences 5, n. 2 (17 aprile 2019): 23–34. http://dx.doi.org/10.3126/jbs.v5i2.23635.

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Background: Quorum sensing is a cell-to-cell communication, which is extensively observed in bacteria. This process allows the cell to detect, analyze, share and act upon various environmental stimuli based on cell density. The molecular aspect of this process is the secretion and detection of chemical signaling molecules called autoinducers (AIs), which act upon the gene expression. The quorum sensing signaling pathway is specifically observed only bulk population or in other words, the quorum sensing is effective only in high cell density. The quorum sensing circuit in the bacterial population is widely studied under the following heading; quorum sensing in Gram positive bacterium, Quorum sensing in Gram negative bacterium and the Quorum sensing with respect to Interkingdom communication. These models are studied using the widely studied models like Vibrio fischeri in Gram negative QS circuit, Staphylococcus aureus in Gram positive QS circuit and Vibrio harveyi. This review paper details the introduction of quorum sensing and their gene level explanation and how they effect on the virulence of a particular species of bacteria. This paper also throws light on the realization that the bacteria has the capable of performing coordinated activities that was so long contributed to the eukaryotic cell performance.
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Yang, Liang, Morten Theil Rybtke, Tim Holm Jakobsen, Morten Hentzer, Thomas Bjarnsholt, Michael Givskov e Tim Tolker-Nielsen. "Computer-Aided Identification of Recognized Drugs as Pseudomonas aeruginosa Quorum-Sensing Inhibitors". Antimicrobial Agents and Chemotherapy 53, n. 6 (13 aprile 2009): 2432–43. http://dx.doi.org/10.1128/aac.01283-08.

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ABSTRACT Attenuation of Pseudomonas aeruginosa virulence by the use of small-molecule quorum-sensing inhibitors (referred to as the antipathogenic drug principle) is likely to play a role in future treatment strategies for chronic infections. In this study, structure-based virtual screening was used in a search for putative quorum-sensing inhibitors from a database comprising approved drugs and natural compounds. The database was built from compounds which showed structural similarities to previously reported quorum-sensing inhibitors, the ligand of the P. aeruginosa quorum-sensing receptor LasR, and a quorum-sensing receptor agonist. Six top-ranking compounds, all recognized drugs, were identified and tested for quorum-sensing-inhibitory activity. Three compounds, salicylic acid, nifuroxazide, and chlorzoxazone, showed significant inhibition of quorum-sensing-regulated gene expression and related phenotypes in a dose-dependent manner. These results suggest that the identified compounds have the potential to be used as antipathogenic drugs. Furthermore, the results indicate that structure-based virtual screening is an efficient tool in the search for novel compounds to combat bacterial infections.
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Sanchez-Contreras, Maria, Wolfgang D. Bauer, Mengsheng Gao, Jayne B. Robinson e J. Allan Downie. "Quorum-sensing regulation in rhizobia and its role in symbiotic interactions with legumes". Philosophical Transactions of the Royal Society B: Biological Sciences 362, n. 1483 (13 marzo 2007): 1149–63. http://dx.doi.org/10.1098/rstb.2007.2041.

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Legume-nodulating bacteria (rhizobia) usually produce N -acyl homoserine lactones, which regulate the induction of gene expression in a quorum-sensing (or population-density)-dependent manner. There is significant diversity in the types of quorum-sensing regulatory systems that are present in different rhizobia and no two independent isolates worked on in detail have the same complement of quorum-sensing genes. The genes regulated by quorum sensing appear to be rather diverse and many are associated with adaptive aspects of physiology that are probably important in the rhizosphere. It is evident that some aspects of rhizobial physiology related to the interaction between rhizobia and legumes are influenced by quorum sensing. However, it also appears that the legumes play an active role, both in terms of interfering with the rhizobial quorum-sensing systems and responding to the signalling molecules made by the bacteria. In this article, we review the diversity of quorum-sensing regulation in rhizobia and the potential role of legumes in influencing and responding to this signalling system.
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Lupp, Claudia, e Edward G. Ruby. "Vibrio fischeri Uses Two Quorum-Sensing Systems for the Regulation of Early and Late Colonization Factors". Journal of Bacteriology 187, n. 11 (1 giugno 2005): 3620–29. http://dx.doi.org/10.1128/jb.187.11.3620-3629.2005.

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ABSTRACT Vibrio fischeri possesses two quorum-sensing systems, ain and lux, using acyl homoserine lactones as signaling molecules. We have demonstrated previously that the ain system activates luminescence gene expression at lower cell densities than those required for lux system activation and that both systems are essential for persistent colonization of the squid host, Euprymna scolopes. Here, we asked whether the relative contributions of the two systems are also important at different colonization stages. Inactivation of ain, but not lux, quorum-sensing genes delayed initiation of the symbiotic relationship. In addition, our data suggest that lux quorum sensing is not fully active in the early stages of colonization, implying that this system is not required until later in the symbiosis. The V. fischeri luxI mutant does not express detectable light levels in symbiosis yet initiates colonization as well as the wild type, suggesting that ain quorum sensing regulates colonization factors other than luminescence. We used a recently developed V. fischeri microarray to identify genes that are controlled by ain quorum sensing and could be responsible for the initiation defect. We found 30 differentially regulated genes, including the repression of a number of motility genes. Consistent with these data, ain quorum-sensing mutants displayed an altered motility behavior in vitro. Taken together, these data suggest that the sequential activation of these two quorum-sensing systems with increasing cell density allows the specific regulation of early colonization factors (e.g., motility) by ain quorum sensing, whereas late colonization factors (e.g., luminescence) are preferentially regulated by lux quorum sensing.
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22

Prazdnova, Evgeniya, Anzhelica Bren, Lilia Golovko, Alexander Teperin, Delin Xu, Xinqing Zhao, Michael Chikindas e Dmitry Rudoy. "Quorum sensing and its inhibition mechanisms". BIO Web of Conferences 113 (2024): 05025. http://dx.doi.org/10.1051/bioconf/202411305025.

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The article is a brief literature review. This article provides an overview of the Quorum Sensing system in bacterial communities, highlighting the peculiarities of the system for gram-positive and gramnegative microorganisms. Basic information about the three existing Quorum Sensing systems is presented. Information is also given about different types of autoinducers, which are signaling molecules that trigger a cascade of behavioral reactions. The importance of the Quorum Sensing system as one of the fundamental mechanisms in the formation and regulation of bacterial biofilms is described, emphasizing the significance of biofilm microorganisms for modern clinical medicine and their impact on aggravating the issue of antibiotic resistance. The main mechanisms of inhibiting bacterial quorum, including by other microorganisms, are presented. The work discusses enzymatic and non-enzymatic methods of inhibiting the Quorum Sensing system, points of application and mechanisms of action. Some microorganisms with confirmed enzymatic activity by Quorum Quenching are indicated. Also presented are registered cases of suppression of other bacteria by microorganisms through the Quorum Sensing inhibitors system.
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Henke, Jennifer M., e Bonnie L. Bassler. "Quorum Sensing Regulates Type III Secretion in Vibrio harveyi and Vibrio parahaemolyticus". Journal of Bacteriology 186, n. 12 (15 giugno 2004): 3794–805. http://dx.doi.org/10.1128/jb.186.12.3794-3805.2004.

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ABSTRACT In a process known as quorum sensing, bacteria communicate with one another by producing, releasing, detecting, and responding to signal molecules called autoinducers. Vibrio harveyi, a marine pathogen, uses two parallel quorum-sensing circuits, each consisting of an autoinducer-sensor pair, to control the expression of genes required for bioluminescence and a number of other target genes. Genetic screens designed to discover autoinducer-regulated targets in V. harveyi have revealed genes encoding components of a putative type III secretion (TTS) system. Using transcriptional reporter fusions and TTS protein localization studies, we show that the TTS system is indeed functional in V. harveyi and that expression of the genes encoding the secretion machinery requires an intact quorum-sensing signal transduction cascade. The newly completed genome of the closely related marine bacterium Vibrio parahaemolyticus, which is a human pathogen, shows that it possesses the genes encoding both of the V. harveyi-like quorum-sensing signaling circuits and that it also has a TTS system similar to that of V. harveyi. We show that quorum sensing regulates TTS in V. parahaemolyticus. Previous reports connecting quorum sensing to TTS in enterohemorrhagic and enteropathogenic Escherichia coli show that quorum sensing activates TTS at high cell density. Surprisingly, we find that at high cell density (in the presence of autoinducers), quorum sensing represses TTS in V. harveyi and V. parahaemolyticus.
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Deep, Antariksh, Uma Chaudhary e Varsha Gupta. "Quorum sensing and Bacterial Pathogenicity: From Molecules to Disease". Journal of Laboratory Physicians 3, n. 01 (gennaio 2011): 004–11. http://dx.doi.org/10.4103/0974-2727.78553.

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ABSTRACT Quorum sensing in prokaryotic biology refers to the ability of a bacterium to sense information from other cells in the population when they reach a critical concentration (i.e. a Quorum) and communicate with them. The "language" used for this intercellular communication is based on small, self-generated signal molecules called as autoinducers. Quorum sensing is thought to afford pathogenic bacteria a mechanism to minimize host immune responses by delaying the production of tissue-damaging virulence factors until sufficient bacteria have amassed and are prepared to overwhelm host defense mechanisms and establish infection. Quorum sensing systems are studied in a large number of gram-negative bacterial species belonging to α, β, and γ subclasses of proteobacteria. Among the pathogenic bacteria, Pseudomonas aeruginosa is perhaps the best understood in terms of the virulence factors regulated and the role the Quorum sensing plays in pathogenicity. Presently, Quorum sensing is considered as a potential novel target for antimicrobial therapy to control multi/all drug-resistant infections. This paper reviews Quorum sensing in gram positive and gram negative bacteria and its role in biofilm formation.
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Wang, Meizhen, Amy L. Schaefer, Ajai A. Dandekar e E. Peter Greenberg. "Quorum sensing and policing of Pseudomonas aeruginosa social cheaters". Proceedings of the National Academy of Sciences 112, n. 7 (2 febbraio 2015): 2187–91. http://dx.doi.org/10.1073/pnas.1500704112.

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The bacterium Pseudomonas aeruginosa is an opportunistic human pathogen that uses a quorum sensing signal cascade to activate expression of dozens of genes when sufficient population densities have been reached. Quorum sensing controls production of several key virulence factors, including secreted proteases such as elastase. Cooperating groups of bacteria growing on protein are susceptible to social cheating by quorum-sensing defective mutants. A possible way to restrict cheater emergence is by policing where cooperators produce costly goods to sanction or punish cheats. The P. aeruginosa LasR-LasI quorum sensing system controls genes including those encoding proteases and also those encoding a second quorum-sensing system, the RhlR-RhlI system, which controls numerous genes including those for cyanide production. By using RhlR quorum sensing mutants and cyanide synthesis mutants, we show that cyanide production is costly and cyanide-producing cooperators use cyanide to punish LasR-null social cheaters. Cooperators are less susceptible to cyanide than are LasR mutants. These experiments demonstrate policing in P. aeruginosa, provide a mechanistic understanding of policing, and show policing involves the cascade organization of the two quorum sensing systems in this bacterium.
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Moffett, Alexander S., Peter J. Thomas, Michael Hinczewski e Andrew W. Eckford. "Cheater suppression and stochastic clearance through quorum sensing". PLOS Computational Biology 18, n. 7 (28 luglio 2022): e1010292. http://dx.doi.org/10.1371/journal.pcbi.1010292.

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The evolutionary consequences of quorum sensing in regulating bacterial cooperation are not fully understood. In this study, we reveal unexpected effects of regulating public good production through quorum sensing on bacterial population dynamics, showing that quorum sensing can be a collectively harmful alternative to unregulated production. We analyze a birth-death model of bacterial population dynamics accounting for public good production and the presence of non-producing cheaters. Our model demonstrates that when demographic noise is a factor, the consequences of controlling public good production according to quorum sensing depend on the cost of public good production and the growth rate of populations in the absence of public goods. When public good production is inexpensive, quorum sensing is a destructive alternative to unconditional production, in terms of the mean population extinction time. When costs are higher, quorum sensing becomes a constructive strategy for the producing strain, both stabilizing cooperation and decreasing the risk of population extinction.
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Nazzaro, Filomena, Florinda Fratianni e Raffaele Coppola. "Quorum Sensing and Phytochemicals". International Journal of Molecular Sciences 14, n. 6 (17 giugno 2013): 12607–19. http://dx.doi.org/10.3390/ijms140612607.

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Jani, Athraa Juhi. "Anti-Quorum Sensing Nanonetwork". Indian Journal of Public Health Research & Development 9, n. 12 (2018): 1108. http://dx.doi.org/10.5958/0976-5506.2018.01998.8.

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Wackett, Lawrence P. "Web Alert: Quorum sensing". Environmental Microbiology 22, n. 3 (marzo 2020): 1167–68. http://dx.doi.org/10.1111/1462-2920.14939.

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Miller, Melissa B., e Bonnie L. Bassler. "Quorum Sensing in Bacteria". Annual Review of Microbiology 55, n. 1 (ottobre 2001): 165–99. http://dx.doi.org/10.1146/annurev.micro.55.1.165.

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Martin, Sophie G. "Quorum sensing with pheromones". Nature Microbiology 4, n. 9 (22 agosto 2019): 1430–31. http://dx.doi.org/10.1038/s41564-019-0538-y.

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Soberón-Chávez, Gloria, Marisela Aguirre-Ramírez e Leandro Ordóñez. "IsPseudomonas aeruginosaOnly “Sensing Quorum”?" Critical Reviews in Microbiology 31, n. 3 (gennaio 2005): 171–82. http://dx.doi.org/10.1080/10408410591005138.

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Givskov, Michael. "Bacterial quorum sensing inhibitors". ASAIO Journal 47, n. 2 (marzo 2001): 178. http://dx.doi.org/10.1097/00002480-200103000-00306.

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Ellaiah, P., T. Prabhakar, G. Jaya Prakash, V. Saisha e V. Sreenivasulu. "Technical note: Quorum sensing". International Journal of Biotechnology 5, n. 2 (2003): 170. http://dx.doi.org/10.1504/ijbt.2003.003609.

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Obst, Ursula. "Quorum sensing: bacterial chatting". Analytical and Bioanalytical Chemistry 387, n. 2 (1 dicembre 2006): 369–70. http://dx.doi.org/10.1007/s00216-006-0965-5.

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Eickhoff, Michaela J., e Bonnie L. Bassler. "SnapShot: Bacterial Quorum Sensing". Cell 174, n. 5 (agosto 2018): 1328–1328. http://dx.doi.org/10.1016/j.cell.2018.08.003.

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Novick, Richard P., e Edward Geisinger. "Quorum Sensing in Staphylococci". Annual Review of Genetics 42, n. 1 (dicembre 2008): 541–64. http://dx.doi.org/10.1146/annurev.genet.42.110807.091640.

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Zhai, Chunmei, Ping Zhang, Fei Shen, Changxin Zhou e Changhong Liu. "DoesMicrocystis aeruginosahave quorum sensing?" FEMS Microbiology Letters 336, n. 1 (21 agosto 2012): 38–44. http://dx.doi.org/10.1111/j.1574-6968.2012.02650.x.

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Bernardini, Francesco, Marian Gheorghe e Natalio Krasnogor. "Quorum sensing P systems". Theoretical Computer Science 371, n. 1-2 (febbraio 2007): 20–33. http://dx.doi.org/10.1016/j.tcs.2006.10.012.

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Kruppa, Michael. "Quorum sensing andCandida albicans". Mycoses 52, n. 1 (gennaio 2009): 1–10. http://dx.doi.org/10.1111/j.1439-0507.2008.01626.x.

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de Kievit, T. R. "Quorum sensing inPseudomonas aeruginosabiofilms". Environmental Microbiology 11, n. 2 (febbraio 2009): 279–88. http://dx.doi.org/10.1111/j.1462-2920.2008.01792.x.

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Jung, Kirsten. "Buchrezension zu: Quorum Sensing". BIOspektrum 26, n. 1 (febbraio 2020): 117. http://dx.doi.org/10.1007/s12268-020-1328-z.

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43

SMITH, JAMES L., PINA M. FRATAMICO e JOHN S. NOVAK. "Quorum Sensing: A Primer for Food Microbiologists†". Journal of Food Protection 67, n. 5 (1 maggio 2004): 1053–70. http://dx.doi.org/10.4315/0362-028x-67.5.1053.

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Abstract (sommario):
Quorum sensing is a signaling mechanism through which bacteria modulate a number of cellular functions (genes), including sporulation, biofilm formation, bacteriocin production, virulence responses, as well as others. Quorum sensing is a mechanism of cell-to-cell communication and is mediated by extracellular chemical signals generated by the bacteria when specific cell densities are reached. When the concentration of the signal (and cell population) is sufficiently high, the target gene or genes are either activated or repressed. Quorum sensing increases the ability of the bacteria to have access to nutrients or to more favorable environmental niches and enhances bacterial defenses against eukaryotic hosts, competing bacteria, and environmental stresses. The physiological and clinical aspects of quorum sensing have received considerable attention and have been studied at the molecular level. Little is known, however, on the role of quorum sensing in food spoilage or in the growth and/or toxin production of pathogens present in food. A number of compounds have been isolated or synthesized that antagonize quorum sensors, and application of these antagonists may potentially be useful in inhibiting the growth or virulence mechanisms of bacteria in different environments, including food. It is important that food microbiologists have an awareness and an understanding of the mechanisms involved in bacterial quorum sensing, since strategies targeting quorum sensing may offer a means to control the growth of undesirable bacteria in foods.
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AMMOR, MOHAMMED SALIM, CHRISTOS MICHAELIDIS e GEORGE-JOHN E. NYCHAS. "Insights into the Role of Quorum Sensing in Food Spoilage". Journal of Food Protection 71, n. 7 (1 luglio 2008): 1510–25. http://dx.doi.org/10.4315/0362-028x-71.7.1510.

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Food spoilage is a consequence of the degrading enzymatic activity of some food-associated bacteria. Several proteolytic, lipolytic, chitinolytic, and pectinolytic activities associated with the deterioration of goods are regulated by quorum sensing, suggesting a potential role of such cell-to-cell communication in food spoilage. Here we review quorum sensing signaling molecules and methods of their detection and quantification, and we provide insights into the role of quorum sensing in food spoilage and address potential quorum sensing inhibitors that might be used as biopreservatives.
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45

Rice, S. A., K. S. Koh, S. Y. Queck, M. Labbate, K. W. Lam e S. Kjelleberg. "Biofilm Formation and Sloughing in Serratia marcescens Are Controlled by Quorum Sensing and Nutrient Cues". Journal of Bacteriology 187, n. 10 (15 maggio 2005): 3477–85. http://dx.doi.org/10.1128/jb.187.10.3477-3485.2005.

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ABSTRACT We describe here a role for quorum sensing in the detachment, or sloughing, of Serratia marcescens filamentous biofilms, and we show that nutrient conditions affect the biofilm morphotype. Under reduced carbon or nitrogen conditions, S. marcescens formed a classical biofilm consisting of microcolonies. The filamentous biofilm could be converted to a microcolony-type biofilm by switching the medium after establishment of the biofilm. Similarly, when initially grown as a microcolony biofilm, S. marcescens could be converted back to a filamentous biofilm by increasing the nutrient composition. Under high-nutrient conditions, an N-acyl homoserine lactone quorum-sensing mutant formed biofilms that were indistinguishable from the wild-type biofilms. Similarly, other quorum-sensing-dependent behaviors, such as swarming motility, could be rendered quorum sensing independent by manipulating the growth medium. Quorum sensing was also found to be involved in the sloughing of the filamentous biofilm. The biofilm formed by the bacterium consistently sloughed from the substratum after approximately 75 to 80 h of development. The quorum-sensing mutant, when supplemented with exogenous signal, formed a wild-type filamentous biofilm and sloughed at the same time as the wild type, and this was independent of surfactant production. When we removed the signal from the quorum-sensing mutant prior to the time of sloughing, the biofilm did not undergo significant detachment. Together, the data suggest that biofilm formation by S. marcescens is a dynamic process that is controlled by both nutrient cues and the quorum-sensing system.
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46

Biradar, Baswaraj, e Prapulla Devi. "Quorum Sensing in Plaque Biofilms: Challenges and Future Prospects". Journal of Contemporary Dental Practice 12, n. 6 (2011): 479–85. http://dx.doi.org/10.5005/jp-journals-10024-1080.

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ABSTRACT Aim This review intends to provide a brief overview regarding quorum sensing among bacteria in biofilms and also attempts to throw light on the new research focusing on interference with the quorum sensing. Background Dental plaque is an example of microbial biofilm leading to periodontal disease and dental caries. Quorum sensing is widely employed by a variety of gram-positive and gram-negative bacterial species to coordinate various activities in biofilms. Quorum-sensing-interfering compounds have either a positive or a negative effect on the expression of bacterial phenotypes regulated by quorum sensing. These studies of bacterial quorum sensing have also suggested several ideal targets for drug design which can be promising in preventive and therapeutic aspects of periodontal diseases and dental caries. Results Studies have shown that periodontal disease and dental caries is caused by plaque biofilm bacteria. Quorum sensing is the means of communication between these bacteria to regulate a wide range of behavior patterns among them. The in vitro studies reviewed here have a vital role in opening up this field, because they reveal the basic machinery of cell—cell signaling in microbial communities. The signal machinery bacteria use to coordinate a variety of their activities is identified by these studies. Further, this review aims to discuss several natural and synthetic methods which were used for manipulating bacterial quorum sensing. Conclusion The future challenge lies in the ability of the dental research to develop additional mechanisms for interfering with bacterial quorum sensing which can be used as preventive and therapeutic tools for combating oral polymicrobial diseases. Clinical significance This article aims at reviewing the literature and helping us to understand the ways of communication among bacteria in biofilms, which further open up the prospects in the treatment of diseases caused by biofilms. How to cite this article Biradar B, Devi P. Quorum Sensing in Plaque Biofilms: Challenges and Future Prospects. J Contemp Dent Pract 2011;12(6):479-485.
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Polizzi, Alessandro, Martina Donzella, Giada Nicolosi, Simona Santonocito, Paolo Pesce e Gaetano Isola. "Drugs for the Quorum Sensing Inhibition of Oral Biofilm: New Frontiers and Insights in the Treatment of Periodontitis". Pharmaceutics 14, n. 12 (7 dicembre 2022): 2740. http://dx.doi.org/10.3390/pharmaceutics14122740.

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Abstract (sommario):
Chemical molecules are used by microorganisms to communicate with each other. Quorum sensing is the mechanism through which microorganisms regulate their population density and activity with chemical signaling. The inhibition of quorum sensing, called quorum quenching, may disrupt oral biofilm formation, which is the main etiological factor of oral diseases, including periodontitis. Periodontitis is a chronic inflammatory disorder of infectious etiology involving the hard and soft periodontal tissues and which is related to various systemic disorders, including cardiovascular diseases, diabetes and obesity. The employment of adjuvant therapies to traditional scaling and root planing is currently being studied to further reduce the impact of periodontitis. In this sense, using antibiotics and antiseptics involves non-negligible risks, such as antibiotic resistance phenomena and hinders the re-establishment of eubiosis. Different quorum sensing signal molecules have been identified in periodontal pathogenic oral bacteria. In this regard, quorum sensing inhibitors are emerging as some interesting solutions for the management of periodontitis. Therefore, the aim of this review is to summarize the current state of knowledge on the mechanisms of quorum sensing signal molecules produced by oral biofilm and to analyze the potential of quorum sensing inhibitors for the management of periodontitis.
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48

Williams, Paul, Klaus Winzer, Weng C. Chan e Miguel Cámara. "Look who's talking: communication and quorum sensing in the bacterial world". Philosophical Transactions of the Royal Society B: Biological Sciences 362, n. 1483 (13 marzo 2007): 1119–34. http://dx.doi.org/10.1098/rstb.2007.2039.

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Abstract (sommario):
For many years bacteria were considered primarily as autonomous unicellular organisms with little capacity for collective behaviour. However, we now appreciate that bacterial cells are in fact, highly communicative. The generic term ‘quorum sensing’ has been adopted to describe the bacterial cell-to-cell communication mechanisms which co-ordinate gene expression usually, but not always, when the population has reached a high cell density. Quorum sensing depends on the synthesis of small molecules (often referred to as pheromones or autoinducers) that diffuse in and out of bacterial cells. As the bacterial population density increases, so does the synthesis of quorum sensing signal molecules, and consequently, their concentration in the external environment rises. Once a critical threshold concentration has been reached, a target sensor kinase or response regulator is activated (or repressed) so facilitating the expression of quorum sensing-dependent genes. Quorum sensing enables a bacterial population to mount a co-operative response that improves access to nutrients or specific environmental niches, promotes collective defence against other competitor prokaryotes or eukaryotic defence mechanisms and facilitates survival through differentiation into morphological forms better able to combat environmental threats. Quorum sensing also crosses the prokaryotic–eukaryotic boundary since quorum sensing-dependent signalling can be exploited or inactivated by both plants and mammals.
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Loke, Wai Keong, e Halimi Mohd Saud. "Screening of Anti-Quorum Sensing Activity from Selected Chinese Herbs Against Chromobacterium violaceum". Journal of Biochemistry, Microbiology and Biotechnology 7, n. 2 (26 dicembre 2019): 24–26. http://dx.doi.org/10.54987/jobimb.v7i2.478.

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Overuse of antibiotics was contributed to the increasing of bacterial infection resistance against antibiotics and caused a serious issue to the public health. Anti-quorum sensing is a new alternative ways or treatments to fight bacterial pathogenicity. Traditional Chinese herbs were screened of their anti-quorum sensing activities. Six selected traditional Chinese herbs were screened for a simple anti-quorum sensing activity by using Chromobacterium violaceum as the biomonitor. Two out of these herbs were found to be able to exhibit anti-quorum sensing properties; Lycium barbarum and Zingiber officinale. Extraction from Lycium barbarum has stronger anti-quorum sensing activity than Zingiber officinale. Colonies of biomonitor C. violaceum treated with Lycium barbarum almost fully loss its purple pigment. The loss and lack of purple colour from the colonies of C. violaceum indicated that quorum sensing activity was inhibited by the herb’s extracted. It is believed that this herb contains rich source of compounds to fight or control pathogenic bacteria and potentially a new therapeutic way to reduce the development of antibiotic resistanc
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50

Sundar, Kothandapani. "Quorum Sensing Based Drug Screening Against Vibrio Cholerae". Journal of Microbes and Research 1, n. 1 (28 novembre 2022): 01–05. http://dx.doi.org/10.58489/2836-2187/001.

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The QS method is a means of bacterial cell-to-cell communication, which uses extracellular signal molecules called autoinducers to transmit information between cells.Bacteria can use QS to collaborate on tasks. The pathogen Vibrio cholerae uses QS to inhibit the development of virulence factors and the formation of biofilms. Cholera is caused by the Gram-negative, curved bacteria Vibrio cholerae (Clemens et al., 2017). There are also a number of virulence components produced by this disease, including cholera hemolysin (CH), toxin-co-regulated pilus (TCP), flagellum, etc. By constraining the target protein, HapR, with adequate bioactive compounds, the pathogenic activity of in vibrio cholerae can be suppressed.Bioactive substances from various natural food sources were chosen and analysed for their quorum quenching effect against HapR protein utilising bioinformatics methods. The in-silico analysis produced notable results for thirteen of the 25 substances evaluated, with the best docking score. These chemicals could be employed for QSI-based therapeutics against vibrio cholerae infections and could be suggested for in vitro and in vivo investigations.
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