1
|
Fernandes C, Sousa-Baptista J, Lenha-Silva AF, Calheiros D, Correia E, Figueirinha A, Salgueiro L, Gonçalves T. Azorean Black Tea ( Camellia sinensis) Antidermatophytic and Fungicidal Properties. Molecules 2023; 28:7775. [PMID: 38067505 PMCID: PMC10707949 DOI: 10.3390/molecules28237775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Revised: 11/17/2023] [Accepted: 11/22/2023] [Indexed: 12/18/2023] Open
Abstract
The treatment of dermatophytoses, the most common human fungal infections, requires new alternatives. The aim of this study was to determine the antidermatophytic activity of the aqueous Azorean Black Tea extract (ABT), together with an approach to the mechanisms of action. The phytochemical analysis of ABT extract was performed by HPLC. The dermatophytes susceptibility was assessed using a broth microdilution assay; potential synergies with terbinafine and griseofulvin were evaluated by the checkerboard assay. The mechanism of action was appraised by the quantification of the fungal cell wall chitin and β-1,3-glucan, and by membrane ergosterol. The presence of ultrastructural modifications was studied by Transmission Electron Microscopy (TEM). The ABT extract contained organic and phenolic acids, flavonoids, theaflavins and alkaloids. It showed an antidermatophytic effect, with MIC values of 250 µg/mL for Trichophyton mentagrophytes, 125 µg/mL for Trichophyton rubrum and 500 µg/mL for Microsporum canis; at these concentrations, the extract was fungicidal. An additive effect of ABT in association to terbinafine on these three dermatophytes was observed. The ABT extract caused a significant reduction in β-1,3-glucan content, indicating the synthesis of this cell wall component as a possible target. The present study identifies the antidermatophytic activity of the ABT and highlights its potential to improve the effectiveness of conventional topical treatment currently used for the management of skin or mucosal fungal infections.
Collapse
Affiliation(s)
- Chantal Fernandes
- CNC-UC—Center for Neuroscience and Cell Biology of Coimbra, University of Coimbra, 3004-504 Coimbra, Portugal; (C.F.); (J.S.-B.); (A.F.L.-S.); (D.C.); (E.C.)
- CIBB—Centre for Innovative Biomedicine and Biotechnology, University of Coimbra, 3004-504 Coimbra, Portugal
| | - José Sousa-Baptista
- CNC-UC—Center for Neuroscience and Cell Biology of Coimbra, University of Coimbra, 3004-504 Coimbra, Portugal; (C.F.); (J.S.-B.); (A.F.L.-S.); (D.C.); (E.C.)
- CIBB—Centre for Innovative Biomedicine and Biotechnology, University of Coimbra, 3004-504 Coimbra, Portugal
- FMUC—Faculty of Medicine, University of Coimbra, Rua Larga, 3004-504 Coimbra, Portugal
| | - Ana Filipa Lenha-Silva
- CNC-UC—Center for Neuroscience and Cell Biology of Coimbra, University of Coimbra, 3004-504 Coimbra, Portugal; (C.F.); (J.S.-B.); (A.F.L.-S.); (D.C.); (E.C.)
- CIBB—Centre for Innovative Biomedicine and Biotechnology, University of Coimbra, 3004-504 Coimbra, Portugal
| | - Daniela Calheiros
- CNC-UC—Center for Neuroscience and Cell Biology of Coimbra, University of Coimbra, 3004-504 Coimbra, Portugal; (C.F.); (J.S.-B.); (A.F.L.-S.); (D.C.); (E.C.)
- CIBB—Centre for Innovative Biomedicine and Biotechnology, University of Coimbra, 3004-504 Coimbra, Portugal
- FMUC—Faculty of Medicine, University of Coimbra, Rua Larga, 3004-504 Coimbra, Portugal
| | - Edmilson Correia
- CNC-UC—Center for Neuroscience and Cell Biology of Coimbra, University of Coimbra, 3004-504 Coimbra, Portugal; (C.F.); (J.S.-B.); (A.F.L.-S.); (D.C.); (E.C.)
- CIBB—Centre for Innovative Biomedicine and Biotechnology, University of Coimbra, 3004-504 Coimbra, Portugal
| | - Artur Figueirinha
- Faculty of Pharmacy, Health Sciences Campus, University of Coimbra, Azinhaga de S. Comba, 3000-548 Coimbra, Portugal; (A.F.); (L.S.)
- Associated Laboratory for Green Chemistry (LAQV) of the Network of Chemistry and Technology (REQUIMTE), University of Porto, 4099-002 Porto, Portugal
| | - Lígia Salgueiro
- Faculty of Pharmacy, Health Sciences Campus, University of Coimbra, Azinhaga de S. Comba, 3000-548 Coimbra, Portugal; (A.F.); (L.S.)
- Chemical Process Engineering and Forest Products Research Centre, Department of Chemical Engineering, Faculty of Sciences and Technology, University of Coimbra, 3030-790 Coimbra, Portugal
| | - Teresa Gonçalves
- CNC-UC—Center for Neuroscience and Cell Biology of Coimbra, University of Coimbra, 3004-504 Coimbra, Portugal; (C.F.); (J.S.-B.); (A.F.L.-S.); (D.C.); (E.C.)
- CIBB—Centre for Innovative Biomedicine and Biotechnology, University of Coimbra, 3004-504 Coimbra, Portugal
- FMUC—Faculty of Medicine, University of Coimbra, Rua Larga, 3004-504 Coimbra, Portugal
| |
Collapse
|
2
|
Wu K, Zhang T, Chai X, Wang P, Duan X, He D, Zou D. Study on the formation and anti-biofilm properties of cinnamon essential oil inclusion complexes by the structure of modified β-cyclodextrins. Microb Pathog 2023; 184:106361. [PMID: 37743027 DOI: 10.1016/j.micpath.2023.106361] [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: 07/25/2023] [Revised: 09/10/2023] [Accepted: 09/15/2023] [Indexed: 09/26/2023]
Abstract
Essential oils (EOs), which are plant-oriented anti-biofilm agents, are extensively encapsulated by cyclodextrins to overcome their aqueous solubility and chemical instability, and achieve slow release during long-term storage. However, the biological activities of EOs decreased after initial encapsulation in CDs. In this study, modified-β-cyclodextrins (β-CDs) were screened as wall materials to maintained the initial anti-biofilm effect of pure CEO. The inhibitory and bactericidal activities of CEO encapsulated in five types of β-CDs with different substituents (primary hydroxyl, maltosyl, hydroxypropyl, methyl, and carboxymethyl) against Staphylococcus aureus biofilm were evaluated. Crystal violet assay and 3D-View observations suggested that CEO and its inclusion complexes (CEO-ICs) inhibited Staphylococcus aureus biofilm formation through the inhibition of colonising spreading, exopolysaccharide synthesis, and cell surface properties. Molecular docking revealed the causes of the decrease in the anti-biofilm effect after encapsulation, and quantitative structure-activity relationship assays provided MIC and MBIC prediction equation for modified-β-cyclodextrins inclusion complexes. Maltosyl-β-CD was screened as the best wall material to retained the anti-biofilm activities as pure cinnamon essential oil in initial stage, and its inclusion complexes can effectively inhibited biofilm formation in milk. This study provides a theoretical guidance for the selection β-CDs to encapsulate CEO as plant-oriented anti-biofilm agents to inhibit bacterial biofilm formation.
Collapse
Affiliation(s)
- Kegang Wu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 511443, China
| | - Tong Zhang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 511443, China.
| | - Xianghua Chai
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 511443, China
| | - Pingping Wang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 511443, China
| | - Xuejuan Duan
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 511443, China
| | - Dong He
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 511443, China
| | - Dongxin Zou
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 511443, China
| |
Collapse
|
3
|
Raza S, Wdowiak M, Grotek M, Adamkiewicz W, Nikiforow K, Mente P, Paczesny J. Enhancing the antimicrobial activity of silver nanoparticles against ESKAPE bacteria and emerging fungal pathogens by using tea extracts. NANOSCALE ADVANCES 2023; 5:5786-5798. [PMID: 37881701 PMCID: PMC10597549 DOI: 10.1039/d3na00220a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Accepted: 08/12/2023] [Indexed: 10/27/2023]
Abstract
The sale of antibiotics and antifungals has skyrocketed since 2020. The increasing threat of pathogens like ESKAPE bacteria (Enterococcus faecium, Staphylococcus aureus, Klebsiella pneumoniae, Acinetobacter baumannii, Pseudomonas aeruginosa, and Enterobacter spp.), which are effective in evading existing antibiotics, and yeasts like Candida auris or Cryptococcus neoformans is pressing to develop efficient antimicrobial alternatives. Nanoparticles, especially silver nanoparticles (AgNPs), are believed to be promising candidates to supplement or even replace antibiotics in some applications. Here, we propose a way to increase the antimicrobial efficiency of silver nanoparticles by using tea extracts (black, green, or red) for their synthesis. This allows for using lower concentrations of nanoparticles and obtaining the antimicrobial effect in a short time. We found that AgNPs synthesized using green tea extract (G-TeaNPs) are the most effective, causing approximately 80% bacterial cell death in Gram-negative bacteria within only 3 hours at a concentration of 0.1 mg mL-1, which is better than antibiotics. Ampicillin at the same concentration (0.1 mg mL-1) and within the same duration (3 h) causes only up to 40% decrease in the number of S. aureus and E. cloacae cells (non-resistant strains). The tested silver nanoparticles also have antifungal properties and are effective against C. auris and C. neoformans, which are difficult to eradicate using other means. We established that silver nanoparticles synthesized with tea extracts have higher antibacterial properties than silver nanoparticles alone. Such formulations using inexpensive tea extracts and lower concentrations of silver nanoparticles show a promising solution to fight various pathogens.
Collapse
Affiliation(s)
- Sada Raza
- Institute of Physical Chemistry, Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland +48 22 343 2071
| | - Mateusz Wdowiak
- Institute of Physical Chemistry, Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland +48 22 343 2071
| | - Mateusz Grotek
- Institute of Physical Chemistry, Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland +48 22 343 2071
- Military University of Technology gen. Sylwestra Kaliskiego 2 00-908 Warsaw Poland
| | - Witold Adamkiewicz
- Institute of Physical Chemistry, Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland +48 22 343 2071
| | - Kostiantyn Nikiforow
- Institute of Physical Chemistry, Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland +48 22 343 2071
| | - Pumza Mente
- Institute of Physical Chemistry, Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland +48 22 343 2071
| | - Jan Paczesny
- Institute of Physical Chemistry, Polish Academy of Sciences Kasprzaka 44/52 01-224 Warsaw Poland +48 22 343 2071
| |
Collapse
|
4
|
Exopolysaccharide from Lactobacillus casei NA-2 attenuates Escherichia coli O157:H7 surface adhesion via modulation of membrane surface properties and adhesion-related gene expression. Microb Pathog 2022; 173:105863. [PMID: 36332791 DOI: 10.1016/j.micpath.2022.105863] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2022] [Revised: 10/27/2022] [Accepted: 10/28/2022] [Indexed: 11/06/2022]
Abstract
The natural compound, exopolysaccharide from Lactobacillus casei NA-2 (EPS-cn2), has been shown to inhibit biofilm formation by Escherichia coli O157:H7. Although bacterial adhesion to substrate surfaces is a primary, indispensable step in this process, the mechanisms by which EPS-cn2 can block E. coli O157:H7 adhesion to biotic or abiotic surfaces remain unclear. In this study, investigation of E. coli O157:H7 response to EPS-cn2 revealed that 1 mg/mL EPS-cn2 can decrease adherence to polystyrene and confluent Caco-2 cell surfaces to 49.0% (P<0.0001) and 57.0% (P<0.01) of that in untreated E. coli O157:H7, respectively. Moreover, EPS-cn2 significantly reduced outer membrane hydrophobicity by 49.0% and decreased the electronegativity of the membrane surface charge by as much as 1.57 mV (P<0.05) compared to untreated cells. High throughput RNA sequencing indicated that genes responsible for adhesion through extracellular matrix secretion, such as poly-N-acetyl-glucosamine (PNAG) biosynthesis, locus of enterocyte effacement (LEE) proteins and outer membrane protein (OmpT) were all down-regulated in response to EPS-cn2, while chemotaxis and motility-related flagellar assembly genes were differentially up-regulated, suggesting that the EPS-cn2 may serve as an extracellular signal to attenuate adhesion-related gene expression and alter bacterial surface properties in E. coli O157:H7. These findings support the further development of EPS-cn2 for pathogenic biofilm management in clinical and industrial settings, and suggests the further targeting of adhesion-related genes to limit the persistence of this highly pathogenic strain in sensitive environments.
Collapse
|
5
|
Wang Y, Samaranayake LP, Dykes GA. Tea extracts inhibit the attachment of streptococci to oral/dental substrata by reducing hydrogen bonding energies. BIOFOULING 2022; 38:42-54. [PMID: 34886732 DOI: 10.1080/08927014.2021.2013826] [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: 07/14/2021] [Revised: 11/02/2021] [Accepted: 11/29/2021] [Indexed: 06/13/2023]
Abstract
Previous work in the authors' lab demonstrated that tea extracts significantly suppressed streptococcal colonization of abiotic substrata by coating the bacterial cell surfaces with tea components. In this study, the physico-chemical mechanisms by which the tea coating inhibits cellular attachment are demonstrated. The changes in the cell surface physico-chemical properties of streptococci, induced by tea extracts, were measured. Using these results, surface interaction energies were calculated between streptococcal cells and hard surfaces (glass, stainless steel, hydroxyapatite and titanium) within the cellular attachment system exploiting the extended Derjaguin-Landau-Verwey-Overbeek theory. The net energy outcomes were compared with experiment results of attachment assays to validate the predictability of the model. The results showed that the tea extracts inhibited the attachment of the bacteria by 11.1%-91.5%, and reduced the interaction energy by 15.4%-94.9%. It was also demonstrated that the abilities of the bacteria to attach to hard surfaces correlated well with their net interaction energies. The predominant interaction in the systems was found to be hydrogen bonding. In conclusion, tea extracts suppress streptococcal attachment to hard substrata by limiting the formation of hydrogen bonds.
Collapse
Affiliation(s)
- Yi Wang
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
- School of Agriculture and Food Sciences, The University of Queensland, Brisbane, Queensland, Australia
| | | | - Gary A Dykes
- School of Agriculture and Food Sciences, The University of Queensland, Brisbane, Queensland, Australia
| |
Collapse
|
6
|
OUP accepted manuscript. Med Mycol 2022; 60:6526320. [PMID: 35142862 PMCID: PMC8929677 DOI: 10.1093/mmy/myac008] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2021] [Revised: 12/13/2021] [Accepted: 02/01/2022] [Indexed: 11/23/2022] Open
Abstract
Candida auris is an emerging, multi drug resistant fungal pathogen that has caused infectious outbreaks in over 45 countries since its first isolation over a decade ago, leading to in-hospital crude mortality rates as high as 72%. The fungus is also acclimated to disinfection procedures and persists for weeks in nosocomial ecosystems. Alarmingly, the outbreaks of C. auris infections in Coronavirus Disease-2019 (COVID-19) patients have also been reported. The pathogenicity, drug resistance and global spread of C. auris have led to an urgent exploration of novel, candidate antifungal agents for C. auris therapeutics. This narrative review codifies the emerging data on the following new/emerging antifungal compounds and strategies: antimicrobial peptides, combinational therapy, immunotherapy, metals and nano particles, natural compounds, and repurposed drugs. Encouragingly, a vast majority of these exhibit excellent anti- C. auris properties, with promising drugs now in the pipeline in various stages of development. Nevertheless, further research on the modes of action, toxicity, and the dosage of the new formulations are warranted. Studies are needed with representation from all five C. auris clades, so as to produce data of grater relevance, and broader significance and validity.
Collapse
|
7
|
Wang Y. Liposome as a delivery system for the treatment of biofilm-mediated infections. J Appl Microbiol 2021; 131:2626-2639. [PMID: 33650748 DOI: 10.1111/jam.15053] [Citation(s) in RCA: 32] [Impact Index Per Article: 10.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 02/22/2021] [Accepted: 02/24/2021] [Indexed: 12/11/2022]
Abstract
Biofilm formation by pathogenic microorganisms has been a tremendous challenge for antimicrobial therapies due to various factors. The biofilm matrix sequesters bacterial cells from the exterior environment and therefore prevents antimicrobial agents from reaching the interior. In addition, biofilm surface extracellular polymeric substances can absorb antimicrobial agents and thus reduce their bioavailability. To conquer these protection mechanisms, liposomes have been developed into a drug delivery system for antimicrobial agents against biofilm-mediated infections. The unique characteristics of liposomes, including versatility for cargoes, target-specificity, nonimmunogenicity, low toxicity, and biofilm matrix-/cell membrane-fusogenicity, remarkably improve the effectiveness of antimicrobial agents and minimize recurrence of infections. This review summarizes current development of liposomal carriers for biofilm therapeutics, presents evidence in their practical applications and discusses their potential limitations.
Collapse
Affiliation(s)
- Y Wang
- School of Agriculture and Food Sciences, University of Queensland, St Lucia, Qld, Australia
| |
Collapse
|
8
|
Wang Y, Baptist JA, Dykes GA. Garcinia mangostana
extract inhibits the attachment of chicken isolates of
Listeria monocytogenes
to cultured colorectal cells potentially due to a high proanthocyanidin content. J Food Saf 2021. [DOI: 10.1111/jfs.12889] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Yi Wang
- School of Agriculture and Food Sciences The University of Queensland Brisbane Queensland Australia
| | | | - Gary A. Dykes
- Graduate Research School Curtin University Perth Western Australia Australia
| |
Collapse
|
9
|
Wang Y, Lim YY, He Z, Wong WT, Lai WF. Dietary phytochemicals that influence gut microbiota: Roles and actions as anti-Alzheimer agents. Crit Rev Food Sci Nutr 2021; 62:5140-5166. [PMID: 33559482 DOI: 10.1080/10408398.2021.1882381] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
The last decide has witnessed a growing research interest in the role of dietary phytochemicals in influencing the gut microbiota. On the other hand, recent evidence reveals that dietary phytochemicals exhibit properties of preventing and tackling symptoms of Alzheimer's disease, which is a neurodegenerative disease that has also been linked with the status of the gut microbiota over the last decade. Till now, little serious discussions, however, have been made to link recent understanding of Alzheimer's disease, dietary phytochemicals and the gut microbiota together and to review the roles played by phytochemicals in gut dysbiosis induced pathologies of Alzheimer's disease. Deciphering these connections can provide insights into the development and future use of dietary phytochemicals as anti-Alzheimer drug candidates. This review aims at presenting latest evidence in the modulating role of phytochemicals in the gut microbiota and its relevance to Alzheimer's disease and summarizing the mechanisms behind the modulative activities. Limitations of current research in this field and potential directions will also be discussed for future research on dietary phytochemicals as anti-Alzheimer agents.
Collapse
Affiliation(s)
- Yi Wang
- School of Agriculture and Food Sciences, University of Queensland, St Lucia, Queensland, Australia.,School of Dentistry, University of Queensland, Herston, Queensland, Australia
| | - Yau-Yan Lim
- School of Science, Monash University, Bandar Sunway, Selangor, Malaysia
| | - Zhendan He
- College of Pharmacy, Shenzhen Technology University, Shenzhen, China
| | - Wing-Tak Wong
- Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hong Kong Special Administrative Region, China
| | - Wing-Fu Lai
- Department of Applied Biology and Chemical Technology, Hong Kong Polytechnic University, Hong Kong Special Administrative Region, China.,School of Life and Health Sciences, The Chinese University of Hong Kong (Shenzhen), Shenzhen, China
| |
Collapse
|
10
|
Wang Y, Samaranayake LP, Dykes GA. Tea extracts modulate oral biofilm development by altering bacterial hydrophobicity and aggregation. Arch Oral Biol 2020; 122:105032. [PMID: 33418435 DOI: 10.1016/j.archoralbio.2020.105032] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 12/20/2020] [Accepted: 12/23/2020] [Indexed: 12/22/2022]
Abstract
OBJECTIVES This study aims to investigate the effects of tea extracts on biofilm formation by oral streptococci and the potential mechanisms behind the effects. DESIGN We examined the effects of five types of tea extracts (green, oolong, black, pu-erh and chrysanthemum tea) on cell surface hydrophobicity and auto-aggregation of three different streptococcal species (Streptococcus mutans, Streptococcus salivarius and Streptococcus mitis) and evaluated their biofilm formation on four disparate hard surfaces (glass, stainless steel, hydroxyapatite and titanium). The correlation between biofilm formation and the cellular properties were investigated in order to study the mechanisms by which the tea extracts affect biofilm formation. RESULTS Results show that the tea extracts reduced cell surface hydrophobicity (by up to 57.9 %) and, in some cases, altered cellular auto-aggregation (by up to 12 %) and biofilm formation (by up to 2.61 log CFU cm-2). Specifically, oolong tea extract was found to enhance biofilm formation by increasing cellular auto-aggregation and pu-erh tea extract retarded biofilm formation by increasing auto-aggregation. Biofilm formation correlated well to cell surface hydrophobicity and auto-aggregation in combination, but not to either one alone as determined by multiple linear regression analysis. CONCLUSIONS Tea extracts have the ability to modulate streptococcal biofilm formation by altering cell surface hydrophobicity and cellular aggregation.
Collapse
Affiliation(s)
- Yi Wang
- School of Dentistry, the University of Queensland, Brisbane, Queensland 4006, Australia.
| | | | - Gary A Dykes
- Graduate Research School, Curtin University, Perth, Western Australia 6845, Australia.
| |
Collapse
|
11
|
Wang Y, Lee SM, Gentle IR, Dykes GA. A statistical approach for modelling the physical process of bacterial attachment to abiotic surfaces. BIOFOULING 2020; 36:1227-1242. [PMID: 33412938 DOI: 10.1080/08927014.2020.1865934] [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: 06/30/2020] [Revised: 11/02/2020] [Accepted: 12/14/2020] [Indexed: 06/12/2023]
Abstract
A statistical approach using a polynomial linear model in combination with a probability distribution model was developed to mathematically represent the process of bacterial attachment and study its mechanism. The linear deterministic model was built based on data from experiments investigating bacterial and substratum surface physico-chemical factors as predictors of attachment. The prediction results were applied to a normal-approximated binomial distribution model to probabilistically predict attachment. The experimental protocol used mixtures of Streptococcus salivarius and Escherichia coli, and mixtures of porous poly(butyl methacrylate-co-ethyl dimethacrylate) and aluminum sec-butoxide coatings, at varying ratios, to allow bacterial attachment to substratum surfaces across a range of physico-chemical properties (including the surface hydrophobicity of bacterial cells and the substratum, the surface charge of the cells and the substratum, the substratum surface roughness and cell size). The model was tested using data from independent experiments. The model indicated that hydrophobic interaction was the most important predictor while reciprocal interactions existed between some of the factors. More importantly, the model established a range for each factor within which the resultant attachment is unpredictable. This model, however, considers bacterial cells as colloidal particles and accounts only for the essential physico-chemical attributes of the bacterial cells and substratum surfaces. It is therefore limited by a lack of consideration of biological and environmental factors. This makes the model applicable only to specific environments and potentially provides a direction to future modelling for different environments.
Collapse
Affiliation(s)
- Yi Wang
- School of Dentistry, the University of Queensland, Brisbane, Queensland, Australia
- School of Science, Monash University, Bandar Sunway, Selangor, Malaysia
| | - Sui M Lee
- School of Science, Monash University, Bandar Sunway, Selangor, Malaysia
| | - Ian R Gentle
- School of Chemistry and Molecular Biosciences, the University of Queensland, Brisbane, Queensland, Australia
| | - Gary A Dykes
- School of Science, Monash University, Bandar Sunway, Selangor, Malaysia
- Graduate Research School, Curtin University, Perth, Western Australia, Australia
| |
Collapse
|
12
|
Wang Y, Lam ATW. Inhibitory effects of saliva as a suspending fluid on attachment of oral bacteria to hydroxyapatite and titanium. Arch Oral Biol 2020; 120:104924. [PMID: 33091662 DOI: 10.1016/j.archoralbio.2020.104924] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2020] [Revised: 09/22/2020] [Accepted: 09/25/2020] [Indexed: 12/18/2022]
Abstract
OBJECTIVES This study aims to examine the influence of saliva on the attachment of oral bacteria to hydroxyapatite and titanium surfaces in an in vitro setting using saliva as a suspending fluid for the bacterial cells, and to investigate the changes in bacterial surface physicochemical properties (hydrophobicity and charge) induced by saliva. DESIGN Saliva collected from human donors was used to treat five strains of oral bacteria. The surface hydrophobicity and charge of the treated cells were measured. The effects of saliva as a suspending fluid on attachment of the strains to hydroxyapatite and titanium were investigated. RESULTS Saliva was found to inhibit the attachment of four streptococcal strains by up to 100-fold. The inhibitory effects were potentially due to changes in cell-surface physicochemical properties induced by saliva. These effects were, however, not observed on Actinomyces naeslundii. CONCLUSIONS The results suggest that saliva may reduce bacterial colonization by oral streptococci and that using saliva as a suspending fluid may be a useful addition for bacterial attachment studies.
Collapse
Affiliation(s)
- Yi Wang
- School of Dentistry, the University of Queensland, 288 Herston Road, Herston, Brisbane, Queensland 4006, Australia.
| | - Antonia T W Lam
- School of Dentistry, the University of Queensland, 288 Herston Road, Herston, Brisbane, Queensland 4006, Australia
| |
Collapse
|
13
|
Wang Y, Lam ATW. Epigallocatechin gallate and gallic acid affect colonization of abiotic surfaces by oral bacteria. Arch Oral Biol 2020; 120:104922. [PMID: 33045616 DOI: 10.1016/j.archoralbio.2020.104922] [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] [Received: 08/15/2020] [Revised: 09/06/2020] [Accepted: 09/22/2020] [Indexed: 12/18/2022]
Abstract
OBJECTIVES epigallocatechin gallate and gallic acid are known antimicrobial agents. Their roles in controlling microbial colonization, such as bacterial attachment and biofilm formation, are however not completely clear. This study aims to investigate their effects on the colonization of abiotic surfaces by oral bacteria and study the mechanism of their activities. DESIGN the effects of epigallocatechin gallate and gallic acid on cell surface physicochemical properties (hydrophobicity and charge) of a range of oral bacteria and their auto-aggregation, attachment and biofilm formation on different abiotic surfaces (glass, stainless steel and hydroxyapatite) were studied. RESULTS results show that epigallocatechin gallate inhibited bacterial attachment to the hard surfaces (except hydroxyapatite) by 0.2-1.4 log CFU cm-2 by affecting cell surface hydrophobicity and charge. In addition, epigallocatechin gallate induced notches on cell surfaces of Streptococcus mutans without affecting their viability and biofilm formation. Gallic acid enhanced auto-aggregation (by 7.9-30.6 %) and biofilm formation by Actinomyces naeslundii (by 0.9-1.2 log CFU cm-2) by causing calcium efflux from the cells. CONCLUSIONS the tested phytochemicals influenced the colonization of abiotic surfaces by oral bacteria through different mechanisms, most notably via affecting cell surface physicochemical properties, inducing changes in the shape of cell envelopes and causing calcium efflux.
Collapse
Affiliation(s)
- Yi Wang
- School of Dentistry, the University of Queensland, 288, Herston Road, Herston, Brisbane, Queensland 4006, Australia.
| | - Antonia T W Lam
- School of Dentistry, the University of Queensland, 288, Herston Road, Herston, Brisbane, Queensland 4006, Australia
| |
Collapse
|
14
|
Huang JJ, Yu H, Hong G, Cheng H, Zheng M. Antifungal effect of tea extracts on Candida albicans. Dent Mater J 2020; 39:664-669. [PMID: 32249233 DOI: 10.4012/dmj.2019-014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Determining whether tea extracts are effective in removing Candida albicans (C. albicans) from dentures is of interest. This study aimed to investigate the antifungal effect of tea extracts on C. albicans. One green tea (Anji white tea, AGW) and 2 oolong teas (Tie Guan Yin, TGY; Da Hong Pao, DHP) of different concentrations were tested. C. albicans suspensions were inoculated on the plates and the numbers of colony-forming units (CFU) in the culture medium were used to screen for the optimum tea extracts. Polymethyl methacrylate (PMMA) specimens that contained C. albicans biofilms were then treated with the tea extracts and the numbers of CFU were counted. The antifungal activities of the tea extracts were not significantly correlated with their catechin concentrations. Although AGW at 10.0 mg/mL and DHP at 2.5 mg/mL significantly inhibited C. albicans in the culture medium, the extracts failed to exert inhibitory effects against C. albicans biofilms on the PMMA surfaces.
Collapse
Affiliation(s)
- Jing-Jing Huang
- Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University
| | - Hao Yu
- Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University.,Department of Applied Prosthodontics, Graduate School of Biomedical Sciences, Nagasaki University
| | - Guang Hong
- Liaison Center for Innovative Dentistry, Graduate School of Dentistry, Tohoku University.,Faculty of Dental Medicine, Airlangga University
| | - Hui Cheng
- Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University
| | - Ming Zheng
- Department of Prosthodontics, School and Hospital of Stomatology, Fujian Medical University
| |
Collapse
|
15
|
de Freitas MA, Silva Alves AI, Andrade JC, Leite-Andrade MC, Lucas dos Santos AT, Felix de Oliveira T, dos Santos FDAG, Silva Buonafina MD, Melo Coutinho HD, Alencar de Menezes IR, Bezerra Morais-Braga MF, Pereira Neves R. Evaluation of the Antifungal Activity of the Licania Rigida Leaf Ethanolic Extract against Biofilms Formed by Candida Sp. Isolates in Acrylic Resin Discs. Antibiotics (Basel) 2019; 8:antibiotics8040250. [PMID: 31817228 PMCID: PMC6963540 DOI: 10.3390/antibiotics8040250] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Revised: 11/28/2019] [Accepted: 11/30/2019] [Indexed: 12/17/2022] Open
Abstract
Candida sp. treatment has become a challenge due to the formation of biofilms which favor resistance to conventional antifungals, making the search for new compounds necessary. The objective of this study was to identify the composition of the Licania rigida Benth. leaf ethanolic extract and to verify its antifungal activity against Candida sp. and its biofilms. The composition identification was performed using the ultra-high performance liquid chromatography-quadrupole time-of-flight mass spectrometry (UPLC-QTOF-MS/MS) technique. The antifungal activity of extract and fluconazole against planktonic cells and biofilms was verified through the minimum inhibitory concentration (MIC) following biofilm induction and quantification in acrylic resin discs by reducing tetrazolic salt, with all isolates forming biofilms within 48 h. Six constituents were identified in the extract, and the compounds identified are derivatives from phenolic compounds such as flavonoids (epi) gallocatechin Dimer, epigallocatechin and gallocatechin, Myricetin-O-hexoside, Myricitrin, and Quercetin-O-rhamnoside. The extract reduced biofilm formation in some of the strains analyzed, namely C. tropicalis URM5732, C. krusei INCQS40042, and C. krusei URM6352. This reduction was also observed in the treatment with fluconazole with some of the analyzed strains. The extract showed significant antifungal and anti-biofilm activities with some of the strains tested.
Collapse
Affiliation(s)
- Maria Audilene de Freitas
- Laboratory of Medical Mycology Sylvio Campos, Department of Mycology, Federal University of Pernambuco-UFPE, Recife, PE 50670-901, Brazil; (M.A.d.F.); (A.I.S.A.); (M.C.L.-A.); (T.F.d.O.); (F.d.A.G.d.S.); (M.D.S.B.); (R.P.N.)
| | - Adryelle Idalina Silva Alves
- Laboratory of Medical Mycology Sylvio Campos, Department of Mycology, Federal University of Pernambuco-UFPE, Recife, PE 50670-901, Brazil; (M.A.d.F.); (A.I.S.A.); (M.C.L.-A.); (T.F.d.O.); (F.d.A.G.d.S.); (M.D.S.B.); (R.P.N.)
| | - Jacqueline Cosmo Andrade
- Laboratory of Microbiology and Molecular Biology, Department of Biological Chemistry, Regional University of Cariri—URCA, Crato, CE 63105-000, Brazil; (J.C.A.); (H.D.M.C.)
| | - Melyna Chaves Leite-Andrade
- Laboratory of Medical Mycology Sylvio Campos, Department of Mycology, Federal University of Pernambuco-UFPE, Recife, PE 50670-901, Brazil; (M.A.d.F.); (A.I.S.A.); (M.C.L.-A.); (T.F.d.O.); (F.d.A.G.d.S.); (M.D.S.B.); (R.P.N.)
| | - Antonia Thassya Lucas dos Santos
- Laboratory of Mycology applied of Cariri, Department of biological Sciences, Regional University of Cariri—URCA, Crato, CE 63105-000, Brazil; (A.T.L.d.S.); (M.F.B.M.-B.)
| | - Tatiana Felix de Oliveira
- Laboratory of Medical Mycology Sylvio Campos, Department of Mycology, Federal University of Pernambuco-UFPE, Recife, PE 50670-901, Brazil; (M.A.d.F.); (A.I.S.A.); (M.C.L.-A.); (T.F.d.O.); (F.d.A.G.d.S.); (M.D.S.B.); (R.P.N.)
| | - Franz de Assis G. dos Santos
- Laboratory of Medical Mycology Sylvio Campos, Department of Mycology, Federal University of Pernambuco-UFPE, Recife, PE 50670-901, Brazil; (M.A.d.F.); (A.I.S.A.); (M.C.L.-A.); (T.F.d.O.); (F.d.A.G.d.S.); (M.D.S.B.); (R.P.N.)
| | - Maria Daniela Silva Buonafina
- Laboratory of Medical Mycology Sylvio Campos, Department of Mycology, Federal University of Pernambuco-UFPE, Recife, PE 50670-901, Brazil; (M.A.d.F.); (A.I.S.A.); (M.C.L.-A.); (T.F.d.O.); (F.d.A.G.d.S.); (M.D.S.B.); (R.P.N.)
| | - Henrique Douglas Melo Coutinho
- Laboratory of Microbiology and Molecular Biology, Department of Biological Chemistry, Regional University of Cariri—URCA, Crato, CE 63105-000, Brazil; (J.C.A.); (H.D.M.C.)
| | - Irwin Rose Alencar de Menezes
- Laboratory of Pharmacology and Molecular Chemistry, Department of chemical biology, Regional University of Cariri—URCA, Crato, CE 63105-000, Brazil
- Correspondence:
| | - Maria Flaviana Bezerra Morais-Braga
- Laboratory of Mycology applied of Cariri, Department of biological Sciences, Regional University of Cariri—URCA, Crato, CE 63105-000, Brazil; (A.T.L.d.S.); (M.F.B.M.-B.)
| | - Rejane Pereira Neves
- Laboratory of Medical Mycology Sylvio Campos, Department of Mycology, Federal University of Pernambuco-UFPE, Recife, PE 50670-901, Brazil; (M.A.d.F.); (A.I.S.A.); (M.C.L.-A.); (T.F.d.O.); (F.d.A.G.d.S.); (M.D.S.B.); (R.P.N.)
| |
Collapse
|