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Zarroug SHO, Bajaman JS, Hamza FN, Saleem RA, Abdalla HK. Caenorhabditis elegans as an In Vivo Model for the Discovery and Development of Natural Plant-Based Antimicrobial Compounds. Pharmaceuticals (Basel) 2023; 16:1070. [PMID: 37630985 PMCID: PMC10458014 DOI: 10.3390/ph16081070] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2023] [Revised: 07/24/2023] [Accepted: 07/25/2023] [Indexed: 08/27/2023] Open
Abstract
Antimicrobial resistance (AMR) due to the prevalence of multidrug-resistant (MDR) pathogens is rapidly increasing worldwide, and the identification of new antimicrobial agents with innovative mechanisms of action is urgently required. Medicinal plants that have been utilised for centuries with minor side effects may hold great promise as sources of effective antimicrobial products. The free-living nematode Caenorhabditis elegans (C. elegans) is an excellent live infection model for the discovery and development of new antimicrobial compounds. However, while C. elegans has widely been utilised to explore the effectiveness and toxicity of synthetic antibiotics, it has not been used to a comparable extent for the analysis of natural products. By screening the PubMed database, we identified articles reporting the use of the C. elegans model for the identification of natural products endowed with antibacterial and antifungal potential, and we critically analysed their results. The studies discussed here provide important information regarding "in vivo" antimicrobial effectiveness and toxicity of natural products, as evaluated prior to testing in conventional vertebrate models, thereby supporting the relevance of C. elegans as a highly proficient model for their identification and functional assessment. However, their critical evaluation also underlines that the characterisation of active phytochemicals and of their chemical structure, and the unravelling of their mechanisms of action represent decisive challenges for future research in this area.
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Affiliation(s)
- Samah H. O. Zarroug
- Department of Pharmacology, College of Medicine, Alfaisal University, Takassusy Road, Riyadh 11533, Saudi Arabia
| | - Juhaina S. Bajaman
- Department of Pharmacology, College of Medicine, Alfaisal University, Takassusy Road, Riyadh 11533, Saudi Arabia
| | - Fatheia N. Hamza
- Department of Biochemistry, College of Medicine, Alfaisal University, Takassusy Road, Riyadh 11533, Saudi Arabia; (F.N.H.); (R.A.S.)
| | - Rimah A. Saleem
- Department of Biochemistry, College of Medicine, Alfaisal University, Takassusy Road, Riyadh 11533, Saudi Arabia; (F.N.H.); (R.A.S.)
| | - Hana K. Abdalla
- Department of Microbiology, College of Medicine, Alfaisal University, Takassusy Road, Riyadh 11533, Saudi Arabia;
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2
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Anju VT, Busi S, Kumar S, Suchiang K, Kumavath R, Ranganathan S, Ampasala DR, Dyavaiah M. Alantolactone modulates the production of quorum sensing mediated virulence factors and biofilm formation in Pseudomonas aeruginosa. BIOFOULING 2022; 38:331-347. [PMID: 35469529 DOI: 10.1080/08927014.2022.2064747] [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: 11/23/2021] [Revised: 04/05/2022] [Accepted: 04/06/2022] [Indexed: 06/14/2023]
Abstract
Pseudomonas aeruginosa is an opportunistic pathogen in immunocompromised patients and accounts for mortality worldwide. Quorum sensing (QS) and QS mediated biofilm formation of P. aeruginosa increase the severity of infection in the host. New and effective therapeutics are in high demand to eliminate Pseudomonas infections. The current study investigated the quorum quenching and biofilm inhibition properties of alantolactone (ATL) against P. aeruginosa PAO1. The production of key virulence factors and biofilm components were affected in bacteria when treated with sub-MIC of ATL and further validated by qRT-PCR studies. The anti-infective potential of ATL was corroborated in an in vivo model with improved survival of infected Caenorhabditis elegans and reduced bacterial colonization. In silico studies suggested the molecular interactions of ATL to QS proteins as stable. Finally, ATL was explored in the present study to inhibit QS pathways and holds the potential to develop into an effective anti-infective agent against P. aeruginosa.
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Affiliation(s)
- V T Anju
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, India
| | - Siddhardha Busi
- Department of Microbiology, School of Life Sciences, Pondicherry University, Puducherry, India
| | - Sandeep Kumar
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, India
| | - Kitlangki Suchiang
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, India
| | - Ranjith Kumavath
- Department of Genomic Science, School of Biological Sciences, Central University of Kerala, Kasaragod, Kerala, India
| | - Sampathkumar Ranganathan
- Department of Bioinformatics, School of Life Sciences, Pondicherry University, Puducherry, India
| | - Dinakara Rao Ampasala
- Department of Bioinformatics, School of Life Sciences, Pondicherry University, Puducherry, India
| | - Madhu Dyavaiah
- Department of Biochemistry and Molecular Biology, School of Life Sciences, Pondicherry University, Puducherry, India
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3
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Lang M, Montjarret A, Duteil E, Bedoux G. Cinnamomum cassia and Syzygium aromaticum Essential Oils Reduce the Colonization of Salmonella Typhimurium in an In Vivo Infection Model Using Caenorhabditis elegans. Molecules 2021; 26:5598. [PMID: 34577068 PMCID: PMC8467367 DOI: 10.3390/molecules26185598] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 09/09/2021] [Accepted: 09/10/2021] [Indexed: 11/16/2022] Open
Abstract
The regulation of intestinal colonization in livestock by means of non-bactericidal additives is an important management lever for zoonotic bacteria such as Salmonella spp. Caenorhabditis elegans is proposed here as a model for the evaluation of five essential oils (EOs) as anti-colonization products against Salmonella Typhimurium. An evaluation of the toxicity of EOs for C. elegans showed LD50 values ranging from 74.5 ± 9.6 µg/mL for Cinnamomum cassia (CEO) to 271.6 ± 14.9 µg/mL for Syzygium aromaticum (SyEO). Both EOs significantly inhibited bacterial colonization in the digestive tract of C. elegans with reductions of 0.88 and 0.70 log CFU/nematode at nontoxic concentrations of 50 µg/mL and 150 µg/mL, respectively. With the minimal bactericidal concentrations of CEO and SyEO against S. Typhimurium being 312.5 µg/mL and 625 µg/mL, respectively, an antibacterial effect can be excluded to explain the inhibition of the bacterial load. The anti-colonizing activity of these two EOs could, however, be related to an inhibition of the swimming motility, which was significantly reduced by 23.47% for CEO at 50 µg/mL and 19.56% for SyEO at 150 µg/mL. This study shows the potential of C. elegans as a predictive in vivo model of anti-colonizing activities that is suitable for the evaluation of essential oils.
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Affiliation(s)
- Marie Lang
- BioArmor S.A., Z.I de la Gare, F-22940 Plaintel, France; (A.M.); (E.D.)
- Laboratoire de Biotechnologie et Chimie Marines EA 3884, Université Bretagne Sud, F-56100 Lorient, France;
| | - Aude Montjarret
- BioArmor S.A., Z.I de la Gare, F-22940 Plaintel, France; (A.M.); (E.D.)
| | - Emmanuel Duteil
- BioArmor S.A., Z.I de la Gare, F-22940 Plaintel, France; (A.M.); (E.D.)
| | - Gilles Bedoux
- Laboratoire de Biotechnologie et Chimie Marines EA 3884, Université Bretagne Sud, F-56100 Lorient, France;
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Mansuri A, Lokhande K, Kore S, Gaikwad S, Nawani N, Swamy KV, Junnarkar M, Pawar S. Antioxidant, anti-quorum sensing, biofilm inhibitory activities and chemical composition of Patchouli essential oil: in vitro and in silico approach. J Biomol Struct Dyn 2020; 40:154-165. [PMID: 32838699 DOI: 10.1080/07391102.2020.1810124] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
The interest in naturally occurring essential oils from medicinal plants has increased extremely over the last decade markedly because they possess antimicrobial and antioxidant protective properties against different chronic diseases. Extensive survival of drug-resistant infectious bacteria depends on quorum sensing (QS) signaling network which raises the need for alternative antibacterial compounds. The aim of this study was to examine the phytochemical compounds of patchouli essential oil (PEO) and to assess its antioxidant activity. Antioxidant studies estimated by 2, 2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging method showed that the PEO has effective antioxidant activity (IC50 19.53 µg/mL). QS inhibitory activity of PEO was examined by employing the biosensor strain, Chromobacterium violaceum CV12472. At sub-lethal concentrations, PEO potentially reduced the QS regulated violacein synthesis in CV12472 without inhibiting its cell proliferation. Moreover, it also effectively reduced the production of some QS regulated virulence factors and biofilm development in P. aeruginosa PAO1 without hindering its growth. Phytochemical analysis of PEO was done by GC/MS technique. Molecular docking of PEO major compounds with QS (LasR and FabI) and biofilm regulator proteins (MvfR and Sialidase) of PAO1 was evaluated. These phytocompounds showed potential hydrogen binding interactions with these proteins. The overall results, in vitro and in silico, suggest that PEO could be applied as biocontrol agent against antibiotic resistance pathogens. Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Afrin Mansuri
- Microbial Diversity Research Centre, Dr. D. Y. Patil Biotechnology and Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, India
| | - Kiran Lokhande
- Bioinformatics Research Laboratory, Dr. D. Y. Patil Biotechnology and Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, India
| | - Supriya Kore
- Microbial Diversity Research Centre, Dr. D. Y. Patil Biotechnology and Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, India
| | - Swapnil Gaikwad
- Microbial Diversity Research Centre, Dr. D. Y. Patil Biotechnology and Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, India
| | - Neelu Nawani
- Microbial Diversity Research Centre, Dr. D. Y. Patil Biotechnology and Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, India
| | - K Venkateswara Swamy
- Bioinformatics Research Laboratory, Dr. D. Y. Patil Biotechnology and Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, India
| | - Manisha Junnarkar
- Microbial Diversity Research Centre, Dr. D. Y. Patil Biotechnology and Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, India
| | - Sarika Pawar
- Microbial Diversity Research Centre, Dr. D. Y. Patil Biotechnology and Bioinformatics Institute, Dr. D. Y. Patil Vidyapeeth, Pune, India
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5
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Y Ramírez-Rueda R, Salvador MJ. Phenotypic detection of quorum sensing inhibition in Pseudomonas aeruginosa pyoverdine and swarming by volatile organic products. Future Microbiol 2020; 15:1147-1156. [DOI: 10.2217/fmb-2020-0033] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Aim: To determine phenotypically the anti quorum-sensing (QS) activity of 30 volatile organic products (VOPs) through the inhibition of swarming motility and pyoverdine production in Pseudomonas aeruginosa. Materials & methods: Twenty-four essential oils and six small volatile organic compounds randomly selected were screened for their anti-QS activity by violacein inhibition on Chromobacterium violaceum. The VOPs with positive results were subsequently evaluated for swarming motility and pyoverdine production on P. aeruginosa determining the colony diameter and fluorescence under UV light, respectively. Results: Fifty percent of VOPs tested showed strong violacein inhibition, 40% presented anti-swarming activity and 33% inhibited pyoverdine production. Conclusion: Our data demonstrate that VOPs have a great potential to inhibit virulence factors mediated by QS in P. aeruginosa
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Affiliation(s)
- Román Y Ramírez-Rueda
- Department of Plant Biology, PPG BTPB & PPG BV, Institute of Biology, University of Campinas - UNICAMP, Postal Box 6109, Campinas – SP 13083-970, Brazil
- Faculty of Health Sciences. Pedagogical & Technological University of Colombia, Postal Box 0387437173 Tunja, Calle 24 N° 5-63, Colombia
| | - Marcos J Salvador
- Department of Plant Biology, PPG BTPB & PPG BV, Institute of Biology, University of Campinas - UNICAMP, Postal Box 6109, Campinas – SP 13083-970, Brazil
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Mishra R, Kushveer JS, Khan MIK, Pagal S, Meena CK, Murali A, Dhayalan A, Venkateswara Sarma V. 2,4-Di-Tert-Butylphenol Isolated From an Endophytic Fungus, Daldinia eschscholtzii, Reduces Virulence and Quorum Sensing in Pseudomonas aeruginosa. Front Microbiol 2020; 11:1668. [PMID: 32849344 PMCID: PMC7418596 DOI: 10.3389/fmicb.2020.01668] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 06/25/2020] [Indexed: 02/01/2023] Open
Abstract
Pseudomonas aeruginosa is among the top three gram-negative bacteria according to the WHO’s critical priority list of pathogens against which newer antibiotics are urgently needed and considered a global threat due to multiple drug resistance. This situation demands unconventional antimicrobial strategies such as the inhibition of quorum sensing to alleviate the manifestation of classical resistance mechanisms. Here, we report that 2,4-di-tert-butylphenol (2,4-DBP), isolated from an endophytic fungus, Daldinia eschscholtzii, inhibits the quorum-sensing properties of P. aeruginosa. We have found that treating P. aeruginosa with 2,4-DBP substantially reduced the secretion of virulence factors as well as biofilm, and its associated factors that are controlled by quorum sensing, in a dose-dependent manner. Concomitantly, 2,4-DBP also significantly reduced the expression of quorum sensing-related genes, i.e., lasI, lasR, rhlI, and rhlR significantly. Importantly, 2,4-DBP restricted the adhesion and invasion of P. aeruginosa to the A549 lung alveolar carcinoma cells. In addition, bactericidal assay with 2,4-DBP exhibited synergism with ampicillin to kill P. aeruginosa. Furthermore, our computational studies predicted that 2,4-DBP could bind to the P. aeruginosa quorum-sensing receptors LasR and RhlR. Collectively, these data suggest that 2,4-DBP can be exploited as a standalone drug or in combination with antibiotic(s) as an anti-virulence and anti-biofilm agent to combat the multidrug resistant P. aeruginosa infection.
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Affiliation(s)
- Rashmi Mishra
- Department of Biotechnology, Pondicherry University, Puducherry, India
| | | | - Mohd Imran K Khan
- Department of Biotechnology, Pondicherry University, Puducherry, India
| | - Sudhakar Pagal
- Department of Biotechnology, Pondicherry University, Puducherry, India
| | | | - Ayaluru Murali
- Centre for Bioinformatics, Pondicherry University, Puducherry, India
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7
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Zhang L, Wei Y, Tao Y, Zhao S, Wei X, Yin X, Liu S, Niu Q. Molecular mechanism of the smart attack of pathogenic bacteria on nematodes. Microb Biotechnol 2020; 13:683-705. [PMID: 31730281 PMCID: PMC7111092 DOI: 10.1111/1751-7915.13508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2019] [Revised: 10/16/2019] [Accepted: 10/20/2019] [Indexed: 11/28/2022] Open
Abstract
Nematode-bacterial associations are far-reaching subjects in view of their impact on ecosystems, economies, agriculture and human health. There is still no conclusion regarding which pathogenic bacteria sense nematodes. Here, we found that the pathogenic bacterium Bacillus nematocida B16 was sensitive to C. elegans and could launch smart attacks to kill the nematodes. Further analysis revealed that the spores of B. nematocida B16 are essential virulence factors. Once gaseous molecules (morpholine) produced from C. elegans were sensed, the sporulation of B16 was greatly accelerated. Then, B16 showed maximum attraction to C. elegans during the spore-forming process but had no attraction until all the spores were formed. The disruption of either the spore formation gene spo0A or the germination gene gerD impaired colonization and attenuated infection in B16. In contrast, complementation with the intact genes restored most of the above-mentioned deficient phenotypes, which indicated that the spo0A gene was a key factor in the smart attack of B16 on C. elegans. Further, transcriptome, molecular simulations and quantitative PCR analysis showed that morpholine from C. elegans could promote sporulation and initiate infection by increasing the transcription of the spo0A gene by decreasing the transcription of the rapA and spo0E genes. The overexpression of rapA or spo0E decreased the induced sporulation effect, and morpholine directly reduced the level of phosphorylation of purified recombinant RapA and Spo0E compared to that of Spo0A. Collectively, these findings further support a 'Trojan horse-like' infection model. The significance of our paper is that we showed that the soil-dwelling bacterium B. nematocida B16 has the ability to actively detect, attract and attack their host C. elegans. These studies are the first report on the behaviours, signalling molecules and mechanism of the smart attack of B16 on nematodes and also reveal new insights into microbe-host interactions.
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Affiliation(s)
- Lin Zhang
- Department of Life Science and BiotechnologyNanyang Normal UniversityNanyang473000China
- State Key Laboratory of Cotton BiologyHenan Key Laboratory of Plant Stress BiologySchool of Life SciencesHenan UniversityKaifengHenan475001China
| | - Yuping Wei
- Department of Life Science and BiotechnologyNanyang Normal UniversityNanyang473000China
| | - Ye Tao
- Department of Life Science and BiotechnologyNanyang Normal UniversityNanyang473000China
| | - Suya Zhao
- Department of Life Science and BiotechnologyNanyang Normal UniversityNanyang473000China
| | - Xuyang Wei
- Department of Life Science and BiotechnologyNanyang Normal UniversityNanyang473000China
| | - Xiaoyan Yin
- Department of Life Science and BiotechnologyNanyang Normal UniversityNanyang473000China
| | - Suyao Liu
- Department of Life Science and BiotechnologyNanyang Normal UniversityNanyang473000China
| | - Qiuhong Niu
- Department of Life Science and BiotechnologyNanyang Normal UniversityNanyang473000China
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8
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Cui T, Bai F, Sun M, Lv X, Li X, Zhang D, Du H. Lactobacillus crustorum ZHG 2-1 as novel quorum-quenching bacteria reducing virulence factors and biofilms formation of Pseudomonas aeruginosa. Lebensm Wiss Technol 2020. [DOI: 10.1016/j.lwt.2019.108696] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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9
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Mishra R, Kushveer JS, Khan MIK, Pagal S, Meena CK, Murali A, Dhayalan A, Venkateswara Sarma V. 2,4-Di-Tert-Butylphenol Isolated From an Endophytic Fungus, Daldinia eschscholtzii, Reduces Virulence and Quorum Sensing in Pseudomonas aeruginosa. Front Microbiol 2020; 11:1668. [PMID: 32849344 DOI: 10.3389/fmicb.2020.0166-8] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2020] [Accepted: 06/25/2020] [Indexed: 05/20/2023] Open
Abstract
Pseudomonas aeruginosa is among the top three gram-negative bacteria according to the WHO's critical priority list of pathogens against which newer antibiotics are urgently needed and considered a global threat due to multiple drug resistance. This situation demands unconventional antimicrobial strategies such as the inhibition of quorum sensing to alleviate the manifestation of classical resistance mechanisms. Here, we report that 2,4-di-tert-butylphenol (2,4-DBP), isolated from an endophytic fungus, Daldinia eschscholtzii, inhibits the quorum-sensing properties of P. aeruginosa. We have found that treating P. aeruginosa with 2,4-DBP substantially reduced the secretion of virulence factors as well as biofilm, and its associated factors that are controlled by quorum sensing, in a dose-dependent manner. Concomitantly, 2,4-DBP also significantly reduced the expression of quorum sensing-related genes, i.e., lasI, lasR, rhlI, and rhlR significantly. Importantly, 2,4-DBP restricted the adhesion and invasion of P. aeruginosa to the A549 lung alveolar carcinoma cells. In addition, bactericidal assay with 2,4-DBP exhibited synergism with ampicillin to kill P. aeruginosa. Furthermore, our computational studies predicted that 2,4-DBP could bind to the P. aeruginosa quorum-sensing receptors LasR and RhlR. Collectively, these data suggest that 2,4-DBP can be exploited as a standalone drug or in combination with antibiotic(s) as an anti-virulence and anti-biofilm agent to combat the multidrug resistant P. aeruginosa infection.
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Affiliation(s)
- Rashmi Mishra
- Department of Biotechnology, Pondicherry University, Puducherry, India
| | | | - Mohd Imran K Khan
- Department of Biotechnology, Pondicherry University, Puducherry, India
| | - Sudhakar Pagal
- Department of Biotechnology, Pondicherry University, Puducherry, India
| | | | - Ayaluru Murali
- Centre for Bioinformatics, Pondicherry University, Puducherry, India
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10
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Evaluation of anti-quorum sensing activity of indigenous dietary plants against Pseudomonas aeruginosa. Eur J Integr Med 2019. [DOI: 10.1016/j.eujim.2019.100931] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Rubini D, Banu SF, Subramani P, Hari BNV, Gowrishankar S, Pandian SK, Wilson A, Nithyanand P. Extracted chitosan disrupts quorum sensing mediated virulence factors in Urinary tract infection causing pathogens. Pathog Dis 2019; 77:5364546. [PMID: 30801640 DOI: 10.1093/femspd/ftz009] [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: 10/04/2018] [Accepted: 02/22/2019] [Indexed: 02/06/2023] Open
Abstract
Quorum sensing (QS) plays an important role during the aetiology of urinary tract infection (UTI), as several virulence factors are under the regulation of QS. Pseudomonas aeruginosa and Serratia marcescens, the primary causative agents of UTI, employ acyl homoserine lactone (AHL) as signal molecules to coordinate various virulence factors. In this present study, chitosan extracted from the marine crab Portunus sanguinolentus was screened for its ability to inhibit the QS-signaling molecules of P. aeruginosa (PA01) and few clinical isolates of P. aeruginosa and S. marcescens. The extracted chitosan on comparison with a commercial chitosan showed significant inhibition of several QS-dependent virulence factors in P. aeruginosa and S. marscenes. Furthermore, qPCR analysis was carried out to confirm the down-regulation of fimA, fimC and flhD genes involved in adhesion and pathogenesis of S. marcescens and lasI and rhlI genes that governs the P. aeruginosa quorum sensing system. Moreover, the chitosan when coated on a catheter was also able to disrupt the mature biofilms which was revealed by scanning electron microscopy. Collectively, the present study showcases the QS inhibitory property of extracted chitosan from crab shells which is being discarded as a recalcitrant biowaste.
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Affiliation(s)
- Durairajan Rubini
- Biofilm Biology Laboratory, Centre for Research on Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed University, Tirumalaisamudram, Thanjavur 613401,Tamil Nadu, India
| | - Sanaulla Farisa Banu
- Biofilm Biology Laboratory, Centre for Research on Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed University, Tirumalaisamudram, Thanjavur 613401,Tamil Nadu, India
| | - Prabha Subramani
- Biofilm Biology Laboratory, Centre for Research on Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed University, Tirumalaisamudram, Thanjavur 613401,Tamil Nadu, India
| | - B Narayanan Vedha Hari
- Department of Pharmacy, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Shanmugaraj Gowrishankar
- Department of Biotechnology, Alagappa University, Science Campus, Karaikudi - 630004, Tamil Nadu, India
| | | | - Aruni Wilson
- Division of Microbiology and Molecular Genetics, School of Medicine, 11021 Campus Street, Loma Linda, California 92350, USA
| | - Paramasivam Nithyanand
- Biofilm Biology Laboratory, Centre for Research on Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA Deemed University, Tirumalaisamudram, Thanjavur 613401,Tamil Nadu, India
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Husain FM, Ahmad I, Khan FI, Al-Shabib NA, Baig MH, Hussain A, Rehman MT, Alajmi MF, Lobb KA. Seed Extract of Psoralea corylifolia and Its Constituent Bakuchiol Impairs AHL-Based Quorum Sensing and Biofilm Formation in Food- and Human-Related Pathogens. Front Cell Infect Microbiol 2018; 8:351. [PMID: 30410871 PMCID: PMC6211212 DOI: 10.3389/fcimb.2018.00351] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Accepted: 09/14/2018] [Indexed: 01/18/2023] Open
Abstract
The emergence of multi-drug resistance in pathogenic bacteria in clinical settings as well as food-borne infections has become a serious health concern. The problem of drug resistance necessitates the need for alternative novel therapeutic strategies to combat this menace. One such approach is targeting the quorum-sensing (QS) controlled virulence and biofilm formation. In this study, we first screened different fractions of Psoralea corylifolia (seed) for their anti-QS property in the Chromobacterium violaceum 12472 strain. The methanol fraction was found to be the most active fraction and was selected for further bioassays. At sub-inhibitory concentrations, the P. corylifolia methanol fraction (PCMF) reduced QS-regulated virulence functions in C. violaceum CVO26 (violacein); Pseudomonas aeruginosa (elastase, protease, pyocyanin, chitinase, exopolysaccharides (EPS), and swarming motility), A. hydrophila (protease, EPS), and Serratia marcescens (prodigiosin). Biofilm formation in all the test pathogens was reduced significantly (p ≤ 0.005) in a concentration-dependent manner. The β-galactosidase assay showed that the PCMF at 1,000 μg/ml downregulated las-controlled transcription in PAO1. In vivo studies with C. elegans demonstrated increased survival of the nematodes after treatment with the PCMF. Bakuchiol, a phytoconstituent of the extract, demonstrated significant inhibition of QS-regulated violacein production in C. violaceum and impaired biofilm formation in the test pathogens. The molecular docking results suggested that bakuchiol efficiently binds to the active pockets of LasR and RhlR, and the complexes were stabilized by several hydrophobic interactions. Additionally, the molecular dynamics simulation of LasR, LasR-bakuchiol, RhlR, and RhlR-bakuchiol complexes for 50 ns revealed that the binding of bakuchiol to LasR and RhlR was fairly stable. The study highlights the anti-infective potential of the PCMF and bakuchiol instead of bactericidal or bacteriostatic action, as the extract targets QS-controlled virulence and the biofilm.
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Affiliation(s)
- Fohad Mabood Husain
- Department of Food Science and Nutrition, College of Food and Agriculture Sciences, King Saud University, Riyadh, Saudi Arabia.,Department of Agricultural Microbiology, Aligarh Muslim University, Aligarh, India
| | - Iqbal Ahmad
- Department of Food Science and Nutrition, College of Food and Agriculture Sciences, King Saud University, Riyadh, Saudi Arabia
| | - Faez Iqbal Khan
- Department of Chemistry, Rhodes University, Grahamstown, South Africa
| | - Nasser A Al-Shabib
- Department of Food Science and Nutrition, College of Food and Agriculture Sciences, King Saud University, Riyadh, Saudi Arabia
| | | | - Afzal Hussain
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Md Tabish Rehman
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Mohamed F Alajmi
- Department of Pharmacognosy, College of Pharmacy, King Saud University, Riyadh, Saudi Arabia
| | - Kevin A Lobb
- Department of Chemistry, Rhodes University, Grahamstown, South Africa
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Artini M, Patsilinakos A, Papa R, Božović M, Sabatino M, Garzoli S, Vrenna G, Tilotta M, Pepi F, Ragno R, Selan L. Antimicrobial and Antibiofilm Activity and Machine Learning Classification Analysis of Essential Oils from Different Mediterranean Plants against Pseudomonas aeruginosa. Molecules 2018; 23:molecules23020482. [PMID: 29473844 PMCID: PMC6017904 DOI: 10.3390/molecules23020482] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2018] [Revised: 02/03/2018] [Accepted: 02/12/2018] [Indexed: 01/12/2023] Open
Abstract
Pseudomonas aeruginosa is a ubiquitous organism and opportunistic pathogen that can cause persistent infections due to its peculiar antibiotic resistance mechanisms and to its ability to adhere and form biofilm. The interest in the development of new approaches for the prevention and treatment of biofilm formation has recently increased. The aim of this study was to seek new non-biocidal agents able to inhibit biofilm formation, in order to counteract virulence rather than bacterial growth and avoid the selection of escape mutants. Herein, different essential oils extracted from Mediterranean plants were analyzed for their activity against P. aeruginosa. Results show that they were able to destabilize biofilm at very low concentration without impairing bacterial viability. Since the action is not related to a bacteriostatic/bactericidal activity on P. aeruginosa, the biofilm change of growth in presence of the essential oils was possibly due to a modulation of the phenotype. To this aim, application of machine learning algorithms led to the development of quantitative activity–composition relationships classification models that allowed to direct point out those essential oil chemical components more involved in the inhibition of biofilm production. The action of selected essential oils on sessile phenotype make them particularly interesting for possible applications such as prevention of bacterial contamination in the community and in healthcare environments in order to prevent human infections. We assayed 89 samples of different essential oils as P. aeruginosa anti-biofilm. Many samples inhibited P. aeruginosa biofilm at concentrations as low as 48.8 µg/mL. Classification of the models was developed through machine learning algorithms.
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Affiliation(s)
- Marco Artini
- Department of Public Health and Infectious Diseases, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
| | - Alexandros Patsilinakos
- Department of Drug Chemistry and Technology, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
- Rome Center for Molecular Design, Department of Drug Chemistry and Technology, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
- Alchemical Dynamics s.r.l., 00125 Rome, Italy.
| | - Rosanna Papa
- Department of Public Health and Infectious Diseases, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
| | - Mijat Božović
- Department of Drug Chemistry and Technology, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
- Faculty of Natural Sciences and Mathematics, University of Montenegro, Džordža Vašingtona bb, 81000 Podgorica, Montenegro.
| | - Manuela Sabatino
- Department of Drug Chemistry and Technology, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
- Rome Center for Molecular Design, Department of Drug Chemistry and Technology, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
| | - Stefania Garzoli
- Department of Drug Chemistry and Technology, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
| | - Gianluca Vrenna
- Department of Public Health and Infectious Diseases, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
| | - Marco Tilotta
- Department of Public Health and Infectious Diseases, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
| | - Federico Pepi
- Department of Drug Chemistry and Technology, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
| | - Rino Ragno
- Department of Drug Chemistry and Technology, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
- Rome Center for Molecular Design, Department of Drug Chemistry and Technology, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
- Alchemical Dynamics s.r.l., 00125 Rome, Italy.
| | - Laura Selan
- Department of Public Health and Infectious Diseases, Sapienza University, P.le Aldo Moro 5, 00185 Rome, Italy.
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