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Antoniadou M, Rozos G, Vaou N, Zaralis K, Ersanli C, Alexopoulos A, Dadamogia A, Varzakas T, Tzora A, Voidarou C(C. Comprehensive Bio-Screening of Phytochemistry and Biological Capacity of Oregano ( Origanum vulgare) and Salvia triloba Extracts against Oral Cariogenic and Food-Origin Pathogenic Bacteria. Biomolecules 2024; 14:619. [PMID: 38927023 PMCID: PMC11201555 DOI: 10.3390/biom14060619] [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: 05/02/2024] [Revised: 05/20/2024] [Accepted: 05/21/2024] [Indexed: 06/28/2024] Open
Abstract
This study utilized phytochemical screening to conduct the qualitative analysis of plant extracts, aiming to identify various classes of secondary metabolites. Moreover, the antibacterial activity of different types of Oregano vulgare and Salvia triloba extracts was determined. To achieve the aim of this study, aqueous, ethanolic, and enzymatic extracts were prepared and screened for phytochemical capacity and antioxidant activities. The determination of the antibacterial activity included phenotypic screening of antibiotic susceptibility pattern of oral and food pathogenic bacterial strains, determination of the minimum inhibitory concentration and minimum bactericidal concentration-via microdilution broth test and in vitro valuation of antibacterial efficacies-of the anti-biofilm properties of the studied herbal extractions. Results: Our study evaluated the phytochemical composition and the antioxidant, antibacterial, and anti-biofilm properties of O. vulgare and S. triloba extracts. The analyzed samples contained bioactive compounds, such as phenolics and flavonoids, contributing to the observed strong antioxidant effect. Furthermore, they exhibited notable activity against oral biofilm formation and demonstrated significant antibacterial efficacy against dental caries' microorganisms as well as food pathogens. Despite methodological variations, all extracts showed significant antioxidant capacity and promising antibacterial activity against various pathogens, including resistant strains, while also inhibiting biofilm formation. Although limited to two plant species and facing methodological constraints, this study lays the groundwork for future research, indicating the therapeutic potential of O. vulgare and S. triloba extracts. Further exploration is needed to report on underlying mechanisms and validate efficacy through clinical trials.
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Affiliation(s)
- Maria Antoniadou
- Department of Dentistry, School of Health Sciences, National and Kapodistrian University of Athens, 11527 Athens, Greece
- Executive Mastering Program in Systemic Management (CSAP), University of Piraeus, 18451 Piraeus, Greece
| | - Georgios Rozos
- Department of Agriculture, School of Agricultural Sciences, University of Western Macedonia, 53100 Florina, Greece; (G.R.); (K.Z.)
- Laboratory of Animal Health, Food Hygiene and Quality, Department of Agriculture, University of Ioannina, 47100 Arta, Greece; (C.E.); (A.D.); (A.T.)
| | - Natalia Vaou
- Laboratory of Microbiology, Department of Medicine, National and Kapodistrian University of Athens, 11527 Athens, Greece;
| | - Konstantinos Zaralis
- Department of Agriculture, School of Agricultural Sciences, University of Western Macedonia, 53100 Florina, Greece; (G.R.); (K.Z.)
| | - Caglar Ersanli
- Laboratory of Animal Health, Food Hygiene and Quality, Department of Agriculture, University of Ioannina, 47100 Arta, Greece; (C.E.); (A.D.); (A.T.)
| | - Athanasios Alexopoulos
- Laboratory of Microbiology, Biotechnology & Hygiene, Department of Agricultural Development, Democritus University of Thrace, 68200 Orestiada, Greece;
| | - Aikaterini Dadamogia
- Laboratory of Animal Health, Food Hygiene and Quality, Department of Agriculture, University of Ioannina, 47100 Arta, Greece; (C.E.); (A.D.); (A.T.)
| | - Theodoros Varzakas
- Department Food Science and Technology, University of the Peloponnese, 24100 Kalamata, Greece;
| | - Athina Tzora
- Laboratory of Animal Health, Food Hygiene and Quality, Department of Agriculture, University of Ioannina, 47100 Arta, Greece; (C.E.); (A.D.); (A.T.)
| | - Chrysoula (Chrysa) Voidarou
- Laboratory of Animal Health, Food Hygiene and Quality, Department of Agriculture, University of Ioannina, 47100 Arta, Greece; (C.E.); (A.D.); (A.T.)
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Yang H, Ma R, Chen J, Xie Q, Luo W, Sun P, Liu Z, Guo J. Discovery of Melittin as Triple-Action Agent: Broad-Spectrum Antibacterial, Anti-Biofilm, and Potential Anti-Quorum Sensing Activities. Molecules 2024; 29:558. [PMID: 38338303 PMCID: PMC10856726 DOI: 10.3390/molecules29030558] [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: 11/10/2023] [Revised: 01/13/2024] [Accepted: 01/17/2024] [Indexed: 02/12/2024] Open
Abstract
The development of antibiotic-resistant microorganisms is a major global health concern. Recently, there has been an increasing interest in antimicrobial peptides as a therapeutic option. This study aimed to evaluate the triple-action (broad-spectrum antibacterial, anti-biofilm, and anti-quorum sensing activities) of melittin, a membrane-active peptide present in bee venom. The minimum inhibitory concentration and minimum bactericidal concentration of the melittin were determined using the microdilution method and agar plate counting. Growth curve analysis revealed that melittin showed a concentration-dependent antibacterial activity. Scanning electron microscope analysis revealed that melittin treatment altered the morphology. Confocal laser scanning microscope revealed that melittin increased the membrane permeability and intracellular ROS generation in bacteria, all of which contribute to bacterial cell death. In addition, the crystal violet (CV) assay was used to test the anti-biofilm activity. The CV assay demonstrated that melittin inhibited biofilm formation and eradicated mature biofilms. Biofilm formation mediated by quorum sensing (QS) plays a major role in this regard, so molecular docking and molecular dynamics analysis confirmed that melittin interacts with LasR receptors through hydrogen bonds, and further evaluates the anti-QS activity of melittin through the production of virulence factors (pyocyanin, elastase, and rhamnolipid), exopolysaccharides secretion, and bacterial motility, that may be the key to inhibiting the biofilm formation mechanism. The present findings highlight the promising role of melittin as a broad-spectrum antibacterial, anti-biofilm agent, and potential QS inhibitor, providing a new perspective and theoretical basis for the development of alternative antibiotics.
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Affiliation(s)
- Hongyan Yang
- School of Medicine, Foshan University, Foshan 528000, China (J.C.); (Q.X.)
- College of Pharmacy, Jinan University, Guangzhou 510632, China;
| | - Rong Ma
- School of Medicine, Foshan University, Foshan 528000, China (J.C.); (Q.X.)
| | - Jiarou Chen
- School of Medicine, Foshan University, Foshan 528000, China (J.C.); (Q.X.)
| | - Qian Xie
- School of Medicine, Foshan University, Foshan 528000, China (J.C.); (Q.X.)
| | - Wenhui Luo
- Guangdong Yifang Pharmaceutical Co., Ltd., Foshan 528244, China;
| | - Pinghua Sun
- College of Pharmacy, Jinan University, Guangzhou 510632, China;
| | - Zheng Liu
- School of Medicine, Foshan University, Foshan 528000, China (J.C.); (Q.X.)
| | - Jialiang Guo
- School of Medicine, Foshan University, Foshan 528000, China (J.C.); (Q.X.)
- College of Pharmacy, Jinan University, Guangzhou 510632, China;
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Antoniadou M, Rozos G, Vaiou N, Zaralis K, Ersanli C, Alexopoulos A, Tzora A, Varzakas T, Voidarou C(C. The In Vitro Assessment of Antibacterial and Antioxidant Efficacy in Rosa damascena and Hypericum perforatum Extracts against Pathogenic Strains in the Interplay of Dental Caries, Oral Health, and Food Microbiota. Microorganisms 2023; 12:60. [PMID: 38257885 PMCID: PMC10819596 DOI: 10.3390/microorganisms12010060] [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: 11/25/2023] [Revised: 12/18/2023] [Accepted: 12/26/2023] [Indexed: 01/24/2024] Open
Abstract
The rising demand for novel antibiotic agents prompts an investigation into natural resources, notably plant-derived compounds. In this study, various extracts (aqueous, ethanolic, aqueous-ethanolic, and enzymatic) of Rosa damascena and Hypericum perforatum were systematically evaluated against bacterial strains isolated from dental lesions (n = 6) and food sources (raw milk and broiler carcass, n = 2). Minimal inhibitory concentration (MIC), minimal bactericidal concentration (MBC), antibiofilm activity, and time-kill kinetics were assessed across a range of extract concentrations, revealing a dose-responsive effect. Notably, some extracts exhibited superior antibacterial efficacy compared to standard clinical antibiotics, and the time-kill kinetics demonstrated a rapid elimination of bacterial loads within 24 h. The susceptibility pattern proved strain-specific, contingent upon the extract type, yet all tested pathogens exhibited sensitivity. The identified extracts, rich in phenolic and polyphenolic compounds, as well as other antioxidant properties, contributed to their remarkable antibiotic effects. This comprehensive investigation not only highlights the potential of Rosa damascena and Hypericum perforatum extracts as potent antibacterial agents against diverse bacterial strains including caries pathogens, but also underscores their rapid action and dose-dependent efficacy. The findings suggest a promising avenue for harnessing plant-derived compounds in the development of novel antimicrobial strategies against dental caries and other oral inflammations, bridging the gap between natural resources and antibiotic discovery.
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Affiliation(s)
- Maria Antoniadou
- Department of Dentistry, School of Health Sciences, National and Kapodistrian University of Athens, 15784 Athens, Greece;
- CSAP, Executive Mastering Program in Systemic Management, University of Piraeus, 18534 Piraeus, Greece
| | - Georgios Rozos
- Department of Agriculture, School of Agricultural Sciences, University of Western Macedonia, 53100 Florina, Greece; (G.R.); (K.Z.)
- Department of Agriculture, School of Agriculture, University of Ioannina, 47100 Arta, Greece; (C.E.); (A.T.)
| | - Natalia Vaiou
- Laboratory of Microbiology, Department of Medicine, National and Kapodistrian University of Athens, 11527 Athens, Greece;
| | - Konstantinos Zaralis
- Department of Agriculture, School of Agricultural Sciences, University of Western Macedonia, 53100 Florina, Greece; (G.R.); (K.Z.)
| | - Caglar Ersanli
- Department of Agriculture, School of Agriculture, University of Ioannina, 47100 Arta, Greece; (C.E.); (A.T.)
| | - Athanasios Alexopoulos
- Laboratory of Microbiology, Biotechnology & Hygiene, Department of Agricultural Development, Democritus University of Thrace, 68200 Orestiada, Greece;
| | - Athina Tzora
- Department of Agriculture, School of Agriculture, University of Ioannina, 47100 Arta, Greece; (C.E.); (A.T.)
| | - Theodoros Varzakas
- Department Food Science and Technology, University of the Peloponnese, 24100 Kalamata, Greece
| | - Chrysoula (Chrysa) Voidarou
- Department of Agriculture, School of Agriculture, University of Ioannina, 47100 Arta, Greece; (C.E.); (A.T.)
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Zuo J, Shen Y, Wang H, Gao S, Yuan S, Song D, Wang Y, Wang Y. Effects of metformin on Streptococcus suis LuxS/AI-2 quorum sensing system and biofilm formation. Microb Pathog 2023:106183. [PMID: 37263449 DOI: 10.1016/j.micpath.2023.106183] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2023] [Revised: 05/29/2023] [Accepted: 05/30/2023] [Indexed: 06/03/2023]
Abstract
Streptococcus suis (S. suis) regulates biofilm formation through LuxS/AI-2 quorum sensing system, increasing drug resistance and exacerbating infection. The anti-hyperglycaemic agent metformin has anti-bacterial and anti-biofilm activities. This study aimed to investigate the anti-biofilm and anti-quorum sensing activity of metformin in S. suis. We first determined the minimum inhibitory concentration (MIC) and minimum bactericidal concentration (MBC) of metformin on S. suis. The results indicated that metformin showed no obvious inhibitory or bactericidal effect. Crystal violet staining showed that metformin significantly inhibited the formation of S. suis biofilm at sub-MIC concentration, which was also confirmed by scanning electron microscopy. Then, we quantified the AI-2 signal molecules in S. suis, and the results showed that metformin had a significant inhibitory effect on the production of AI-2 signal in S. suis. Inhibition of enzyme activity and molecular docking experiments showed that metformin has a significant binding activity to LuxS protein. In addition, qRT-PCR results showed that metformin significantly down-regulated the expression of AI-2 synthesis-related genes luxS and pfs, and adhesion-related genes luxS, pfs, gapdh, sly, fbps, and ef. Western blotting also showed that metformin significantly reduced the expression of LuxS protein. Our study suggests that metformin seems to be a suitable candidate for the inhibition of S. suis LuxS/AI-2 QS system and prevention of biofilm formation, which provided a new idea for the prevention and control of S. suis.
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Affiliation(s)
- Jing Zuo
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China; Henan Engineering Research Center of Livestock and Poultry Emerging Disease Detection and Control, Luoyang, China
| | - Yamin Shen
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China; Henan Engineering Research Center of Livestock and Poultry Emerging Disease Detection and Control, Luoyang, China
| | - Haikun Wang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China; Henan Engineering Research Center of Livestock and Poultry Emerging Disease Detection and Control, Luoyang, China
| | - Shuji Gao
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China; Henan Engineering Research Center of Livestock and Poultry Emerging Disease Detection and Control, Luoyang, China
| | - Shuo Yuan
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China; Henan Engineering Research Center of Livestock and Poultry Emerging Disease Detection and Control, Luoyang, China
| | - Dong Song
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China; Henan Engineering Research Center of Livestock and Poultry Emerging Disease Detection and Control, Luoyang, China
| | - Yuxin Wang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China; Henan Engineering Research Center of Livestock and Poultry Emerging Disease Detection and Control, Luoyang, China
| | - Yang Wang
- College of Animal Science and Technology, Henan University of Science and Technology, Luoyang, China; Henan Engineering Research Center of Livestock and Poultry Emerging Disease Detection and Control, Luoyang, China.
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Gradinaru LM, Barbalata-Mandru M, Enache AA, Rimbu CM, Badea GI, Aflori M. Chitosan Membranes Containing Plant Extracts: Preparation, Characterization and Antimicrobial Properties. Int J Mol Sci 2023; 24:ijms24108673. [PMID: 37240023 DOI: 10.3390/ijms24108673] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 04/28/2023] [Accepted: 05/10/2023] [Indexed: 05/28/2023] Open
Abstract
The main strategy of this study was to combine the traditional perspective of using medicinal extracts with polymeric scaffolds manufactured by an engineering approach to fabricate a potential dressing product with antimicrobial properties. Thus, chitosan-based membranes containing S. officinalis and H. perforatum extracts were developed and their suitability as novel dressing materials was investigated. The morphology of the chitosan-based films was assessed by scanning electron microscopy (SEM) and the chemical structure characterization was performed via Fourier transform infrared spectroscopy (FTIR). The addition of the plant extracts increased the sorption capacity of the studied fluids, mainly at the membrane with S. officinalis extract. The membranes with 4% chitosan embedded with both plant extracts maintained their integrity after being immersed for 14 days in incubation media, especially in PBS. The antibacterial activities were determined by the modified Kirby-Bauer disk diffusion method for Gram-positive (S. aureus ATCC 25923, MRSA ATCC 43300) and Gram-negative (E. coli ATCC 25922, P. aeruginosa ATCC 27853) microorganisms. The antibacterial property was enhanced by incorporating the plant extracts into chitosan films. The outcome of the study reveals that the obtained chitosan-based membranes are promising candidates to be used as a wound dressing due to their good physico-chemical and antimicrobial properties.
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Affiliation(s)
- Luiza Madalina Gradinaru
- "Petru Poni" Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | - Mihaela Barbalata-Mandru
- "Petru Poni" Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania
| | | | - Cristina Mihaela Rimbu
- Department of Public Health, Faculty of Veterinary Medicine "Ion Ionescu de la Brad", University of Life Sciences, 8 Mihail Sadoveanu Alley, 707027 Iasi, Romania
| | - Georgiana Ileana Badea
- National Institute of Research and Development for Biological Sciences, 296 Independentei Bd. District 6, 060031 Bucharest, Romania
| | - Magdalena Aflori
- "Petru Poni" Institute of Macromolecular Chemistry, 41A Grigore Ghica Voda Alley, 700487 Iasi, Romania
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