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Khan ZA, Wani MY, Ahmad A, Basha MT, Aly NA, Yakout AA. Multifunctional chitosan-cross linked- curcumin-tannic acid biocomposites disrupt quorum sensing and biofilm formation in pathogenic bacteria. Int J Biol Macromol 2024; 271:132719. [PMID: 38821810 DOI: 10.1016/j.ijbiomac.2024.132719] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2024] [Revised: 05/21/2024] [Accepted: 05/27/2024] [Indexed: 06/02/2024]
Abstract
Natural products have a long history of success in treating bacterial infections, making them a promising source for novel antibacterial medications. Curcumin, an essential component of turmeric, has shown potential in treating bacterial infections and in this study, we covalently immobilized curcumin (Cur) onto chitosan (CS) using glutaraldehyde and tannic acid (TA), resulting in the fabrication of novel biocomposites with varying CS/Cur/TA ratios. Comprehensive characterization of these ternary biocomposites was conducted using FTIR, SEM, XPS, and XRD to assess their morphology, functional groups, and chemical structures. The inhibitory efficacy of these novel biocomposites (n = 4) against the growth and viability of Pseudomonas aeruginosa (ATCC27853) and Chromobacterium violaceum (ATCC12472) was evaluated and the most promising composite (C3) was investigated for its impact on quorum sensing (QS) and biofilm formation in these bacteria. Remarkably, this biocomposite significantly disrupted QS circuits and effectively curtailed biofilm formation in the tested pathogens without inducing appreciable toxicity. These findings underscore its potential for future in vivo studies, positioning it as a promising candidate for the development of biofilm disrupting antibacterial agents.
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Affiliation(s)
- Ziya Ahmad Khan
- Department of Chemistry, College of Science, University of Jeddah, 21589 Jeddah, Saudi Arabia.
| | - Mohmmad Younus Wani
- Department of Chemistry, College of Science, University of Jeddah, 21589 Jeddah, Saudi Arabia.
| | - Aijaz Ahmad
- Department of Clinical Microbiology and Infectious Diseases, School of Pathology, Faculty of Health Sciences, University of the Witwatersrand, Johannesburg, South Africa; Division of Pulmonary, Allergy, and Critical Care Medicine, Department of Medicine, University of Pittsburgh Medical Center, Pittsburgh, PA 15213, USA
| | - Maram T Basha
- Department of Chemistry, College of Science, University of Jeddah, 21589 Jeddah, Saudi Arabia
| | - Nada A Aly
- Department of Pharmacy Technology, Faculty of Technological Health Sciences, Borg El Arab Technological University, Egypt; Faculty of Pharmacy, Alexandria University, Alexandria, Egypt
| | - Amr A Yakout
- Department of Chemistry, College of Science, University of Jeddah, 21589 Jeddah, Saudi Arabia; Chemistry Department, Faculty of Science, Alexandria University, Alexandria, Egypt.
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2
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Lv C, Li Z, Sun S, Ma J, Wang H, Zhu H, Sun S, Wang W. A novel polycyclic quinazoline and three quinolines alkaloids from marine-derived fungus trichoderma longibrachiatum QD01 with anti-bacterial and anti-quorum sensing activities. Nat Prod Res 2024:1-10. [PMID: 38613421 DOI: 10.1080/14786419.2024.2341277] [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: 01/09/2024] [Accepted: 04/02/2024] [Indexed: 04/15/2024]
Abstract
A novel polycyclic quinazoline alkaloid (1) along with one new natural quinoline alkaloid (2) and two known quinoline alkaloids (3,4) were isolated from the marine-derived fungus Trichoderma longibrachiatum QD01. Structural determinations of those isolates were established by comprehensive spectroscopic analyses and literature comparison. Single-crystal X-ray diffraction analysis of novel compound verified its structure and stereochemistry, representing the first characterised crystal structure of a trimeric-type of tetrahydroquinazoline. Compound 4 exhibited potential antibacterial and anti-quorum sensing activity against C. violaceum and C. violaceum CV026. The sub-MIC of 4 observably decreased the violacein production in C. violaceum CV026 by 55% on 15 μg/mL. Furthermore, molecular docking results revealed that 4 has stronger binding interactions with CviR receptor than ligand C6-HSL with lower binding energy of -8.68 kcal/mol. Hydrogen bond and π-π interactions formed by Trp84, Tyr88, Trp111, and Phe126 were predicted to play an important role in the inhibition against C. violaceum CV026.
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Affiliation(s)
- Chaoyi Lv
- Department of Natural Medicine and Pharmacognosy, School of Pharmacy, Qingdao University, Qingdao, PR China
| | - Zhizhou Li
- Department of Natural Medicine and Pharmacognosy, School of Pharmacy, Qingdao University, Qingdao, PR China
| | - Shaohua Sun
- Department of Natural Medicine and Pharmacognosy, School of Pharmacy, Qingdao University, Qingdao, PR China
| | - Jiaying Ma
- Department of Natural Medicine and Pharmacognosy, School of Pharmacy, Qingdao University, Qingdao, PR China
| | - Hui Wang
- Department of Natural Medicine and Pharmacognosy, School of Pharmacy, Qingdao University, Qingdao, PR China
| | - Hu Zhu
- Fujian Provincial Key Laboratory of Advanced Materials Oriented Chemical Engineering, College of Chemistry and Materials Science, Fujian Normal University, Fuzhou, PR China
| | - Shiwei Sun
- Department of Natural Medicine and Pharmacognosy, School of Pharmacy, Qingdao University, Qingdao, PR China
| | - Wei Wang
- Department of Natural Medicine and Pharmacognosy, School of Pharmacy, Qingdao University, Qingdao, PR China
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3
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Farha AK, Li Z, Xu Y, Bordiga M, Sui Z, Corke H. Anti-quorum sensing effects of batatasin III: in vitro and in silico studies. J Biomol Struct Dyn 2023; 41:11341-11352. [PMID: 36871957 DOI: 10.1080/07391102.2023.2187226] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2022] [Accepted: 12/07/2022] [Indexed: 03/07/2023]
Abstract
The spread of multidrug resistant bacteria has fueled the development of new antibiotics to combat bacterial infections. Disrupting the quorum sensing (QS) mechanism with biomolecules is a promising approach against bacterial infections. Plants used in Traditional Chinese Medicine (TCM) represent a valuable resource for the identification of QS inhibitors. In this study, the in vitro anti-QS activity of 50 TCM-derived phytochemicals against the biosensor Chromobacterium violaceum CV026 was tested. Among the 50 phytochemicals, 7-methoxycoumarin, flavone, batatasin III, resveratrol, psoralen, isopsoralen, and rhein inhibited violacein production and showed good QS inhibitory effects. Batatasin III was selected as the best QS inhibitor based on drug-likeness, physicochemical properties, toxicity, and bioactivity score prediction analyses using SwissADME, PreADMET, ProtoxII, and Molinspiration. At 30 μg/ mL, Batatasin III inhibited violacein production and biofilm formation in C. violaceum CV026 by more than 69% and 54% respectively without affecting bacterial growth. The in vitro cytotoxicity evaluation by MTT assay demonstrated that batatasin III reduced the viability of 3T3 mouse fibroblast cells to 60% at 100 μg/mL. Furthermore, molecular docking studies showed that batatasin III has strong binding interactions with the QS-associated proteins CViR, LasR, RhlR, PqsE, and PqsR. Molecular dynamic simulation studies showed that batatasin III has strong binding interactions with 3QP1, a structural variant of CViR protein. The binding free energy value of batatasin III-3QP1 complex was -146.295 ± 10.800 KJ/mol. Overall results suggested that batatasin III could serve as a lead molecule that could be developed into a potent QS inhibitor.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Arakkaveettil Kabeer Farha
- Department of Food Science and Technology, Shanghai Jiao Tong University, Shanghai, China
- Biotechnology and Food Engineering Program, Guangdong Technion-Israel Institute of Technology, Shantou, China
| | - Zijun Li
- Department of Food Science and Technology, Shanghai Jiao Tong University, Shanghai, China
| | - Yijuan Xu
- Department of Food Science and Technology, Shanghai Jiao Tong University, Shanghai, China
| | - Matteo Bordiga
- Dipartimento di Scienze del Farmaco, Università degli Studi del Piemonte Orientale "A. Avogadro", Novara, Italy
| | - Zhongquan Sui
- Department of Food Science and Technology, Shanghai Jiao Tong University, Shanghai, China
| | - Harold Corke
- Biotechnology and Food Engineering Program, Guangdong Technion-Israel Institute of Technology, Shantou, China
- Faculty of Biotechnology and Food Engineering, Technion-Israel Institute of Technology, Haifa, Israel
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4
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Malczak I, Gajda A. Interactions of naturally occurring compounds with antimicrobials. J Pharm Anal 2023; 13:1452-1470. [PMID: 38223447 PMCID: PMC10785267 DOI: 10.1016/j.jpha.2023.09.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 09/12/2023] [Accepted: 09/19/2023] [Indexed: 01/16/2024] Open
Abstract
Antibiotics are among the most often used medications in human healthcare and agriculture. Overusing these substances can lead to complications such as increasing antibiotic resistance in bacteria or a toxic effect when administering large amounts. To solve these problems, new solutions in antibacterial therapy are needed. The use of natural products in medicine has been known for centuries. Some of them have antibacterial activity, hence the idea to combine their activity with commercial antibiotics to reduce the latter's use. This review presents collected information on natural compounds (terpenes, alkaloids, flavonoids, tannins, sulfoxides, and mycotoxins), of which various drug interactions have been observed. Many of the indicated compounds show synergistic or additive interactions with antibiotics, which suggests their potential for use in antibacterial therapy, reducing the toxicity of the antibiotics used and the risk of further development of bacterial resistance. Unfortunately, there are also compounds which interact antagonistically, potentially hindering the therapy of bacterial infection. Depending on its mechanism of action, each compound can behave differently in combination with different antibiotics and when acting against various bacterial strains.
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Affiliation(s)
- Izabela Malczak
- Department of Pharmacology and Toxicology, National Veterinary Research Institute, Partyzantów 57, 24-100, Poland
| | - Anna Gajda
- Department of Pharmacology and Toxicology, National Veterinary Research Institute, Partyzantów 57, 24-100, Poland
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5
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Rajan PP, Kumar P, Mini M, Jayakumar D, Vaikkathillam P, Asha S, Mohan A, S M. Antibiofilm potential of gallic acid against Klebsiella pneumoniae and Enterobacter hormaechei: in-vitro and in-silico analysis. BIOFOULING 2023; 39:948-961. [PMID: 37975308 DOI: 10.1080/08927014.2023.2279996] [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: 08/10/2023] [Accepted: 10/27/2023] [Indexed: 11/19/2023]
Abstract
Biofilm refers to a community of microorganisms that adhere to a substrate and play a crucial role in microbial pathogenesis and developing infections associated with medical devices. Enterobacter hormaechei and Klebsiella pneumoniae are classified as significant nosocomial pathogens within the ESKAPE category and cause diverse infections. In addition to their reputation as prolific biofilm formers, these pathogens are increasingly becoming drug-resistant and pose a substantial threat to the healthcare setting. Due to the inherent resistance of biofilms to conventional therapies, novel strategies are imperative for effectively controlling E. hormaechei and K. pneumoniae biofilms. This study aimed to assess the anti-biofilm activity of gallic acid (GA) against E. hormaechei and K. pneumoniae. The results of biofilm quantification assays demonstrated that GA exhibited significant antibiofilm activity against E. hormaechei and K. pneumoniae at concentrations of 4 mg mL-1, 2 mg mL-1, 1 mg mL-1, and 0.5 mg mL-1. Similarly, GA exhibited a dose-dependent reduction in violacein production, a QS-regulated purple pigment, indicating its ability to suppress violacein production and disrupt QS mechanisms in Chromobacterium violaceum. Additionally, computational tools were utilized to identify the potential target involved in the biofilm formation pathway. The computational analysis further indicated the strong binding affinity of GA to essential biofilm regulators, MrkH and LuxS, suggesting its potential in targeting the c-di-GMP and quorum sensing (QS) pathways to hinder biofilm formation in K. pneumoniae. These compelling findings strongly advocate GA as a promising drug candidate against biofilm-associated infections caused by E. hormaechei and K. pneumoniae.
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Affiliation(s)
- Pooja P Rajan
- Department of Zoology, Government College for Women, Thiruvananthapuram, Kerala, India
| | - Praveen Kumar
- Department of Zoology, Government College for Women, Thiruvananthapuram, Kerala, India
| | - Minsa Mini
- Department of Zoology, Government College for Women, Thiruvananthapuram, Kerala, India
| | - Devi Jayakumar
- Department of Zoology, Government College for Women, Thiruvananthapuram, Kerala, India
| | | | - Sneha Asha
- Department of Zoology, Government College for Women, Thiruvananthapuram, Kerala, India
| | - Aparna Mohan
- Department of Zoology, Government College for Women, Thiruvananthapuram, Kerala, India
| | - Manjusree S
- Department of Microbiology, Government Medical College, Thiruvananthapuram, Kerala, India
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6
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Monteiro KLC, Silva ON, Dos Santos Nascimento IJ, Mendonça Júnior FJB, Aquino PGV, da Silva-Júnior EF, de Aquino TM. Medicinal Chemistry of Inhibitors Targeting Resistant Bacteria. Curr Top Med Chem 2022; 22:1983-2028. [PMID: 35319372 DOI: 10.2174/1568026622666220321124452] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2021] [Revised: 02/01/2022] [Accepted: 02/13/2022] [Indexed: 12/15/2022]
Abstract
The discovery of antibiotics was a revolutionary feat that provided countless health benefits. The identification of penicillin by Alexander Fleming initiated the era of antibiotics, represented by constant discoveries that enabled effective treatments for the different classes of diseases caused by bacteria. However, the indiscriminate use of these drugs allowed the emergence of resistance mechanisms of these microorganisms against the available drugs. In addition, the constant discoveries in the 20th century generated a shortage of new molecules, worrying health agencies and professionals about the appearance of multidrug-resistant strains against available drugs. In this context, the advances of recent years in molecular biology and microbiology have allowed new perspectives in drug design and development, using the findings related to the mechanisms of bacterial resistance to generate new drugs that are not affected by such mechanisms and supply new molecules to be used to treat resistant bacterial infections. Besides, a promising strategy against bacterial resistance is the combination of drugs through adjuvants, providing new expectations in designing new antibiotics and new antimicrobial therapies. Thus, this manuscript will address the main mechanisms of bacterial resistance under the understanding of medicinal chemistry, showing the main active compounds against efflux mechanisms, and also the application of the use of drug delivery systems, and finally, the main potential natural products as adjuvants or with promising activity against resistant strains.
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Affiliation(s)
- Kadja Luana Chagas Monteiro
- Research Group on Therapeutic Strategies - GPET, Laboratory of Synthesis and Research in Medicinal Chemistry - LSPMED, Institute of Chemistry and Biotechnology, Federal University of Alagoas, 57072-970, Maceió, Alagoas, Brazil
| | - Osmar Nascimento Silva
- Faculty of Pharmacy, University Center of Anápolis, Unievangélica, 75083-515, Anápolis, Goiás, Brazil
| | - Igor José Dos Santos Nascimento
- Research Group on Therapeutic Strategies - GPET, Laboratory of Synthesis and Research in Medicinal Chemistry - LSPMED, Institute of Chemistry and Biotechnology, Federal University of Alagoas, 57072-970, Maceió, Alagoas, Brazil
| | | | | | - Edeildo Ferreira da Silva-Júnior
- Laboratory of Medicinal Chemistry, Institute of Pharmaceutical Sciences, Federal University of Alagoas, 57072-970, Maceió, Alagoas, Brazil
| | - Thiago Mendonça de Aquino
- Research Group on Therapeutic Strategies - GPET, Laboratory of Synthesis and Research in Medicinal Chemistry - LSPMED, Institute of Chemistry and Biotechnology, Federal University of Alagoas, 57072-970, Maceió, Alagoas, Brazil
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7
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Jailani A, Ahmed B, Lee JH, Lee J. Inhibition of Agrobacterium tumefaciens Growth and Biofilm Formation by Tannic Acid. Biomedicines 2022; 10:1619. [PMID: 35884920 PMCID: PMC9312696 DOI: 10.3390/biomedicines10071619] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 07/04/2022] [Accepted: 07/04/2022] [Indexed: 12/04/2022] Open
Abstract
Agrobacterium tumefaciens underlies the pathogenesis of crown gall disease and is characterized by tumor-like gall formation on the stems and roots of a wide variety of economically important plant species. The bacterium initiates infection by colonizing and forming biofilms on plant surfaces, and thus, novel compounds are required to prevent its growth and biofilm formation. In this study, we investigated the ability of tannic acid, which is ubiquitously present in woody plants, to specifically inhibit the growth and biofilm formation of A. tumefaciens. Tannic acid showed antibacterial activity and significantly reduced the biofilm formation on polystyrene and on the roots of Raphanus sativus as determined by 3D bright-field and scanning electron microscopy (SEM) images. Furthermore, tannic acid dose-dependently reduced the virulence features of A. tumefaciens, which are swimming motility, exopolysaccharide production, protease production, and cell surface hydrophobicity. Transcriptional analysis of cells (Abs600 nm = 1.0) incubated with tannic acid for 24 h at 30 °C showed tannic acid most significantly downregulated the exoR gene, which is required for adhesion to surfaces. Tannic acid at 100 or 200 µg/mL limited the iron supply to A. tumefaciens and similarly reduced the biofilm formation to that performed by 0.1 mM EDTA. Notably, tannic acid did not significantly affect R. sativus germination even at 400 µg/mL. The findings of this study suggest that tannic acid has the potential to prevent growth and biofilm formation by A. tumefaciens and thus infections resulting from A. tumefaciens colonization.
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Affiliation(s)
| | | | | | - Jintae Lee
- School of Chemical Engineering, Yeungnam University, 280 Daehak-ro, Gyeongsan 38541, Korea; (A.J.); (B.A.); (J.-H.L.)
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8
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Karuppiah V, Seralathan M. Quorum sensing inhibitory potential of vaccenic acid against Chromobacterium violaceum and methicillin-resistant Staphylococcus aureus. World J Microbiol Biotechnol 2022; 38:146. [PMID: 35759150 DOI: 10.1007/s11274-022-03335-z] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2022] [Accepted: 06/10/2022] [Indexed: 11/25/2022]
Abstract
Quorum sensing (QS) is a potential target for inhibiting bacterial antibiotic resistance and associated pathogenicity. The present study aimed to investigate vaccenic acid anti-QS and antibiofilm potential against Chromobacterium violaceum and methicillin-resistant Staphylococcus aureus (MRSA). In the broth microdilution method, we determined the minimum inhibitory concentration (MIC) of vaccenic acid against C. violaceum and MRSA. Then, we determined the vaccenic acid anti-QS potential against C. violaceum via a violacein inhibition assay. Vaccenic acid at a sub-MIC concentration significantly inhibited violacein pigment production. Vaccenic acid also inhibits C. violaceum and MRSA biofilm formation at sub-MIC concentrations. The effect of vaccenic acid antivirulence potential was evaluated by phenotypic virulence assays. The results showed that vaccenic acid at a sub-MIC concentration significantly inhibited the virulence production of C. violaceum (chitinase and motility) and MRSA (hemolysin and staphyloxanthin production). Quantitative PCR analysis revealed the downregulation of QS associated genes upon vaccenic acid treatment. This resulted in the downregulation of genes involved in QS mechanisms such as cviI, cviR, and SarA and pigment production such as vioB and crtM. The results of the present study suggest that vaccenic acid is a promising agent to combat C. violaceum and MRSA.
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Affiliation(s)
- Vijayakumar Karuppiah
- Centre of Advanced Study in Marine Biology, Annamalai University, Parangipettai, Cuddalore, Tamil Nadu, 608 502, India.
- PAR Life Sciences and Research Private Limited, Woraiyur, Trichy, Tamil Nadu, 620003, India.
| | - Muhilvannan Seralathan
- PAR Life Sciences and Research Private Limited, Woraiyur, Trichy, Tamil Nadu, 620003, India
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Ahmed SO, Zedan HH, Ibrahim YM. Quorum sensing inhibitory effect of bergamot oil and aspidosperma extract against Chromobacterium violaceum and Pseudomonas aeruginosa. Arch Microbiol 2021; 203:4663-4675. [PMID: 34175964 DOI: 10.1007/s00203-021-02455-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Revised: 05/21/2021] [Accepted: 06/21/2021] [Indexed: 10/21/2022]
Abstract
Quorum sensing (QS) represents a major target for reducing bacterial pathogenicity and antibiotic resistance. This study identifies bergamot and aspidosperma as new potential sources of anti-QS agents. We investigated the anti-QS activity of plant materials on both Chromobacterium violaceum and Pseudomonas aeruginosa. Initially, we determined the minimum inhibitory concentrations (MICs) of plant materials using a broth microdilution method. Subsequently, we tested the effect of sub-MIC concentrations on QS-regulated traits and virulence factors production in test bacteria. Results revealed that bergamot and aspidosperma inhibited the ability of C. violaceum to produce violacein. Other QS-controlled phenotypes of C. violaceum, namely chitinolytic activity, motility, and biofilm formation, were also reduced by both plant materials. Moreover, QS-linked traits of P. aeruginosa were also reduced. Bergamot inhibited swarming but not swimming motility, while aspidosperma diminished both motility types in P. aeruginosa. Both plant materials also demonstrated antibiofilm activity and inhibited the production of protease and pyocyanin in P. aeruginosa. Furthermore, we tested the anti-QS effect of plant materials on the transcriptional level using RT-qPCR. Bergamot dramatically downregulated the C. violaceum autoinducer synthase gene cviI and the vioB gene involved in violacein biosynthesis, confirming the phenotypic observation on its anti-QS activity. Aspidosperma also reduced the expression of cviI and vioB but less drastically than bergamot. In P. aeruginosa, downregulation in the transcripts of the QS genes lasI, lasR, rhlI, and rhlR was also achieved by bergamot and aspidosperma. Therefore, data in the present study suggest the usefulness of bergamot and aspidosperma as sources of antivirulence agents.
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Affiliation(s)
- Sarah Omar Ahmed
- Department of Microbiology, General Division of Basic Medical Sciences, Egyptian Drug Authority (EDA), Formerly National Organization for Drug Control and Research (NODCAR), Giza, 12611, Egypt
| | - Hamdallah Hafez Zedan
- Department of Microbiology and Immunology, Faculty of Pharmacy, Cairo University, Cairo, Egypt
| | - Yasser Musa Ibrahim
- Department of Microbiology, General Division of Basic Medical Sciences, Egyptian Drug Authority (EDA), Formerly National Organization for Drug Control and Research (NODCAR), Giza, 12611, Egypt.
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10
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Ibrahim YM, Abouwarda AM, Omar FA. Effect of kitasamycin and nitrofurantoin at subinhibitory concentrations on quorum sensing regulated traits of Chromobacterium violaceum. Antonie van Leeuwenhoek 2020; 113:1601-1615. [PMID: 32889593 DOI: 10.1007/s10482-020-01467-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2020] [Accepted: 08/25/2020] [Indexed: 12/12/2022]
Abstract
Quorum sensing (QS) is a mechanism of intercellular communication in bacteria that received substantial attention as alternate strategy for combating bacterial resistance and the development of new anti-infective agents. The present investigation reports on the assessment of using subinhibitory concentrations of antibiotics for the inhibition of QS-regulated phenotypes in Chromobacterium violaceum. Primarily, the minimum inhibitory concentrations of a series of antibiotics were determined by a microdilution method. Subsequently, the inhibitory effects of selected antibiotics on QS-regulated traits, namely violacein and chitinase production, biofilm formation and motility were evaluated using C. violaceum CV026 and C. violaceum ATCC 12472. Results revealed that kitasamycin and nitrofurantoin exhibited the highest quorum sensing inhibitory (QSI) activity. The amount of violacein produced by C. violaceum was significantly reduced in the presence of either kitasamycin or nitrofurantoin. Moreover, the chitinolytic activity, biofilm formation, and motility were also impaired in kitasamycin or nitrofurantoin-treated cultures. We further confirmed QSI effects at the molecular level using molecular docking and real-time quantitative polymerase chain reaction (RT-qPCR). Results of molecular docking suggested that both antibiotics can interact with CviR transcriptional regulator of C. violaceum. Furthermore, RT-qPCR revealed the suppressive effect of kitasamycin and nitrofurantoin on five genes under the control of the CviI/CviR system: cviI, cviR, vioB, vioC, and vioD. Giving that kitasamycin and nitrofurantoin are being safely used for decades, this study emphasizes their potential application as antivirulence agents to disarm resistant bacterial strains, making their removal an easier task for the immune system or for another antibacterial agent.
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Affiliation(s)
- Yasser Musa Ibrahim
- Department of Microbiology, General Division of Basic Medical Sciences, National Organization for Drug Control and Research (NODCAR), Giza, 12611, Egypt.
| | - Ahmed Megahed Abouwarda
- Department of Microbiology, General Division of Basic Medical Sciences, National Organization for Drug Control and Research (NODCAR), Giza, 12611, Egypt
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11
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You N, Yao H, Wang Y, Fan HT, Wang CS, Sun T. Development and evaluation of diffusive gradients in thin films based on nano-sized zinc oxide particles for the in situ sampling of tetracyclines in pig breeding wastewater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 651:1653-1660. [PMID: 30312908 DOI: 10.1016/j.scitotenv.2018.09.323] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2018] [Revised: 09/24/2018] [Accepted: 09/25/2018] [Indexed: 06/08/2023]
Abstract
The pollution of antibiotics, including tetracyclines (TCs), in aquatic environments has become an issue of concern in recent years. Herein, an in situ sampling of TCs in pig breeding wastewater that utilizes the technique of diffusive gradients in thin films (DGT), based on commercial nanosized ZnO (nanoZnO) particles as the potential effective binding agent and a polyethersulfone (PES) membrane as the diffusion layer, was developed. The diffusion coefficients of tetracycline (TC), oxytetracycline (OTC) and chlortetracycline (CTC) in a PES membrane at 25 °C were (1.37 ± 0.06) × 10-6 cm2 s-1, (1.29 ± 0.05) × 10-6 cm2 s-1 and (1.94 ± 0.07) × 10-6 cm2 s-1, respectively. The results showed that the adsorption capacities of a gel disc containing 2.5 g L-1 of nanoZnO particles were as high as 3.93 ± 0.20 mg disc-1 for TC, 3.21 ± 0.20 mg disc-1 for OTC and 4.62 ± 0.22 mg disc-1 for CTC. Both a solution pH in the range of 5-9 and an ionic strength (as pNaCl) in the range of 1-3 had an insignificant influence on the TCs uptake by nanoZnO-DGT samplers. There was no significant influence of fulvic acid or tannic acid on the TC uptake by nanoZnO-DGT samplers at the tested mass ratios. For all spiked freshwater samples, there was no notable interference of matrices on the performance of the nanoZnO-DGT samplers, suggesting that the nanoZnO-DGT samplers yielded satisfactory results for the uptake of TCs at concentrations existing in the spiked freshwater samples. Field deployment of the nanoZnO-DGT samplers in pig breeding wastewater also exhibited excellent precision and accuracy, indicating that the nanoZnO-DGT samplers could be used as a promising method for the in situ sampling of TC antibiotics in aquatic environments.
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Affiliation(s)
- Nan You
- College of Chemistry Chemical Engineering, and Environmental Engineering, Liaoning University of Petroleum & Chemical Technology, Fushun 113001, Liaoning, China
| | - Hui Yao
- College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang, 100142, Liaoning, China
| | - Yun Wang
- College of Sciences, Northeastern University, Shenyang 110004, China
| | - Hong-Tao Fan
- College of Chemistry Chemical Engineering, and Environmental Engineering, Liaoning University of Petroleum & Chemical Technology, Fushun 113001, Liaoning, China.
| | - Chang-Song Wang
- College of Applied Chemistry, Shenyang University of Chemical Technology, Shenyang, 100142, Liaoning, China.
| | - Ting Sun
- College of Sciences, Northeastern University, Shenyang 110004, China.
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12
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Kosuru RY, Aashique M, Fathima A, Roy A, Bera S. Revealing the dual role of gallic acid in modulating ampicillin sensitivity of Pseudomonas aeruginosa biofilms. Future Microbiol 2018; 13:297-312. [DOI: 10.2217/fmb-2017-0132] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Aim: To understand the effects of gallic acid (GA) on ampicillin (Amp) sensitive or resistant strain of Pseudomonas sp. and also in modulating the corresponding biofilms. Methodology: The cell viability was determined by broth dilution, dry weight and CFU assays. Biofilm formation was measured by crystal violet assay while oxygen consumption rate was measured to verify the metabolic status of the cells. The membrane damage and drug efflux/accumulation were studied by fluorimetric assays. Results: GA transformed the Amp resistant cells, both planktonic and biofilms, into highly sensitive one by inducing membrane damage and enhancing accumulation of drug, whereas the Amp sensitive cells gained resistance against Amp. Conclusion: Use of GA as an antimicrobial compound should be analyzed more critically depending on the drug dosages, drug sensitivity as well as types of bacterial strains being studied.
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Affiliation(s)
- Rekha Yamini Kosuru
- School of Life Sciences, BS Abdur Rahman University, Vandalur, Chennai, Tamil Nadu 600048, India
| | - Md Aashique
- School of Life Sciences, BS Abdur Rahman University, Vandalur, Chennai, Tamil Nadu 600048, India
| | - Aisha Fathima
- School of Life Sciences, BS Abdur Rahman University, Vandalur, Chennai, Tamil Nadu 600048, India
| | - Amrita Roy
- School of Life Sciences, BS Abdur Rahman University, Vandalur, Chennai, Tamil Nadu 600048, India
| | - Soumen Bera
- School of Life Sciences, BS Abdur Rahman University, Vandalur, Chennai, Tamil Nadu 600048, India
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Silva LN, Zimmer KR, Macedo AJ, Trentin DS. Plant Natural Products Targeting Bacterial Virulence Factors. Chem Rev 2016; 116:9162-236. [PMID: 27437994 DOI: 10.1021/acs.chemrev.6b00184] [Citation(s) in RCA: 263] [Impact Index Per Article: 32.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
Decreased antimicrobial efficiency has become a global public health issue. The paucity of new antibacterial drugs is evident, and the arsenal against infectious diseases needs to be improved urgently. The selection of plants as a source of prototype compounds is appropriate, since plant species naturally produce a wide range of secondary metabolites that act as a chemical line of defense against microorganisms in the environment. Although traditional approaches to combat microbial infections remain effective, targeting microbial virulence rather than survival seems to be an exciting strategy, since the modulation of virulence factors might lead to a milder evolutionary pressure for the development of resistance. Additionally, anti-infective chemotherapies may be successfully achieved by combining antivirulence and conventional antimicrobials, extending the lifespan of these drugs. This review presents an updated discussion of natural compounds isolated from plants with chemically characterized structures and activity against the major bacterial virulence factors: quorum sensing, bacterial biofilms, bacterial motility, bacterial toxins, bacterial pigments, bacterial enzymes, and bacterial surfactants. Moreover, a critical analysis of the most promising virulence factors is presented, highlighting their potential as targets to attenuate bacterial virulence. The ongoing progress in the field of antivirulence therapy may therefore help to translate this promising concept into real intervention strategies in clinical areas.
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Affiliation(s)
- Laura Nunes Silva
- Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul , Porto Alegre, Rio Grande do Sul 90610-000, Brazil.,Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul , Porto Alegre, Rio Grande do Sul 91501-970, Brazil
| | - Karine Rigon Zimmer
- Departamento de Ciências Básicas da Saúde, Universidade Federal de Ciências da Saúde de Porto Alegre , Porto Alegre, Rio Grande do Sul 90050-170, Brazil
| | - Alexandre José Macedo
- Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul , Porto Alegre, Rio Grande do Sul 90610-000, Brazil.,Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul , Porto Alegre, Rio Grande do Sul 91501-970, Brazil.,Instituto Nacional do Semiárido , Campina Grande, Paraı́ba 58429-970, Brazil
| | - Danielle Silva Trentin
- Faculdade de Farmácia, Universidade Federal do Rio Grande do Sul , Porto Alegre, Rio Grande do Sul 90610-000, Brazil.,Centro de Biotecnologia, Universidade Federal do Rio Grande do Sul , Porto Alegre, Rio Grande do Sul 91501-970, Brazil
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