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Elbasuney S, El-Khawaga AM, Elsayed MA, Elsaidy A, Correa-Duarte MA. Enhanced photocatalytic and antibacterial activities of novel Ag-HA bioceramic nanocatalyst for waste-water treatment. Sci Rep 2023; 13:13819. [PMID: 37620510 PMCID: PMC10449880 DOI: 10.1038/s41598-023-40970-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2023] [Accepted: 08/19/2023] [Indexed: 08/26/2023] Open
Abstract
Hydroxyapatite (HA), the most common bioceramic material, offers attractive properties as a catalyst support. Highly crystalline mono-dispersed silver doped hydroxyapatite (Ag-HA) nanorods of 60 nm length was developed via hydrothermal processing. Silver dopant offered enhanced chemisorption for crystal violet (CV) contaminant. Silver was found to intensify negative charge on the catalyst surface; in this regard enhanced chemisorption of positively charged contaminants was accomplished. Silver dopant experienced decrease in the binding energy of valence electron for oxygen, calcium, and phosphorous using X-ray photoelectron spectroscopy XPS/ESCA; this finding could promote electron-hole generation and light absorption. Removal efficiency of Ag-HA nanocomposite for CV reached 88% after the synergistic effect with 1.0 mM H2O2; silver dopant could initiate H2O2 cleavage and intensify the release of active ȮH radicals. Whereas HA suffers from lack of microbial resistance; Ag-HA nanocomposite demonstrated high activity against Gram-positive (S. aureus) bacteria with zone of inhibition (ZOI) mm value of 18.0 mm, and high biofilm inhibition of 91.1%. Ag-HA nanocompsite experienced distinctive characerisitcs for utilization as green bioceramic photocatalyst for wastewater treatment.
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Affiliation(s)
- Sherif Elbasuney
- Military Technical College, Egyptian Armed Forces, Cairo, Egypt.
- School of Chemical Engineering, Military Technical College, Cairo, Egypt.
| | - Ahmed M El-Khawaga
- Department of Basic Medical Sciences, Faculty of Medicine, Galala University, New Galala City, Suez, Egypt.
| | - Mohamed A Elsayed
- School of Chemical Engineering, Military Technical College, Cairo, Egypt
| | - Amir Elsaidy
- School of Chemical Engineering, Military Technical College, Cairo, Egypt
| | - Miguel A Correa-Duarte
- Department of Physical Chemistry, Biomedical Research Center (CINBIO), and Institute of Biomedical Research of Ourense-Pontevedra-Vigo (IBI), Universidad de Vigo, 36310, Vigo, Spain
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Tsai SY, Liu YM, Lin ZW, Lin CP. Antimicrobial activity effects of electrolytically generated hypochlorous acid-treated pathogenic microorganisms by isothermal kinetic simulation. JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY 2022; 148:1613-1627. [PMID: 36338804 PMCID: PMC9628503 DOI: 10.1007/s10973-022-11727-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/21/2021] [Accepted: 10/17/2022] [Indexed: 06/16/2023]
Abstract
This study involves isothermal kinetic simulation to evaluate the parameters of inhibition conditions for Escherichia coli (E. coli) and Staphylococcus aureus (S. aureus) of high-risk pathogens. This is because the new type of the 2019 novel coronavirus (2019-nCoV) is continuously spreading and the importance of public health issues. Environmental disinfection and personal wearing of masks have become important epidemic prevention measures. Selection of concentration kinetics could be estimated best for E. coli and S. aureus of pathogens, 2.74 × 104 and 105 and 2.44 × 104 and 105 colony-forming units (CFU mL-1), by isothermal micro-calorimeter (TAM Air) tests, respectively. Comparisons were made of different doses of 0-70 ppm (in 20 mL test ampoule) hypochlorous acid treatment for conducting nth-order and autocatalytic reaction simulation to evaluate the inhibition reaction parameters, which determined the autocatalytic kinetic model that was beneficially applied on the E. coli and S. aureus. We developed the inhibition reaction parameters of the pathogens, which included the activation energy (E a), the natural logarithm of pre-exponential factor (lnk 0), the enthalpy of inhibition microbial growth reaction (∆H), inhibition microbial growth, and the inhibition growth analysis. Overall, we conducted isothermal kinetic simulation to understand the antimicrobial activity effects of electrolytically generated hypochlorous acid-treated pathogenic microorganisms, which will provide reference for public health and medical-related fields for SDG3, and can contribute to ensuring human health and hygiene.
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Affiliation(s)
- Shu-Yao Tsai
- Department of Biotechnology, National Formosa University, 64, Wunhua Rd., Huwei Township, Yunlin County, 632301 Taiwan
| | - Yu-Ming Liu
- Department of Biotechnology, National Formosa University, 64, Wunhua Rd., Huwei Township, Yunlin County, 632301 Taiwan
| | - Zhi-Wei Lin
- Department of Food Nutrition and Health Biotechnology, Asia University, 500, Lioufeng Rd., Wufeng, Taichung, 41354 Taiwan
| | - Chun-Ping Lin
- Department of Food Nutrition and Health Biotechnology, Asia University, 500, Lioufeng Rd., Wufeng, Taichung, 41354 Taiwan
- Office of Environmental Safety and Health, Asia University, 500, Lioufeng Rd., Wufeng, Taichung, 41354 Taiwan
- Department of Medical Research, China Medical University Hospital, China Medical University, 91, Hsueh-Shih Rd., Taichung, 40402 Taiwan
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Elbasuney S, El-Sayyad GS, Radwan SM, Correa-Duarte MA. Antimicrobial, and Antibiofilm Activities of Silver Doped Hydroxyapatite: A Novel Bioceramic Material for Dental Filling. J Inorg Organomet Polym Mater 2022. [DOI: 10.1007/s10904-022-02459-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022]
Abstract
AbstractEven though hydroxyapatite (HA) is the most common biocompatible material; it has limited antibacterial resistance. HA experiences a tailor-made structure depending on the desired applications. In this regard, silver (Ag) is of particular interest to inhibit wide spectrum of pathogenic bacteria and other microorganisms. Silver doped hydroxyapatite (Ag-HA) was developed via wet co-precipitation with subsequent hydrothermal processing to hinder the growth and multiplication of pathogenic microbes. Ag-HA demonstrated mono-dispersed nano-rods of 70 nm length and 7 nm diameters. Even though silver dopant induced stresses within the crystal lattice; Ag-HA maintained the crystallographic structure of HA with no change. Ag-HA nanocomposite demonstrated Ca/P value of 1.238 compared with 1.402 for virgin HA via XPS spectroscopy. The reduction of Ca/P value was correlated to the partial replacement of Ca+2 with Ag+1; Silver content was reported to be of 1 atomic %. Elemental mapping using EDAX confirmed uniform dispersion of silver ion within HA lattice. Antimicrobial results indicated that, Ag-HA nanocomposite demonstrated the most potent zone of inhibition (ZOI) against Staphylococcus aureus, and Candida albicans. Antibiofilm results indicated that Ag-HA nanocomposite at 10.0 µg/mL, experienced the highest percentage for S. aureus and C. albicans of 96.09%, and 77.77%, respectively. Ag-HA nanocomposite demonstrated an excellent disinfectant agent once it had excited by UV light. In growth curve assay, the OD600 value of Ag- HA were lower, showing the repression impact on the growth of S. aureus. It was observed that the quantity of cellular protein discharged from S. aureus is directly proportional to the concentration of Ag-HA, which proves the antibacterial characteristics of the Ag-HA nanocomposite, and explains the creation of holes in the bacterial membrane producing the oozing out of the proteins from the S. aureus cytoplasm. Ag-HA nanocomposite achieved the complete lysis of the bacterial cell and cell malformation, decreasing the total viable number, so the outstanding antimicrobial results encouraged the tooth filling biomedical applications.
Graphical Abstract
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Fahmy K. Simple Growth–Metabolism Relations Are Revealed by Conserved Patterns of Heat Flow from Cultured Microorganisms. Microorganisms 2022; 10:microorganisms10071397. [PMID: 35889118 PMCID: PMC9318308 DOI: 10.3390/microorganisms10071397] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 06/29/2022] [Accepted: 07/04/2022] [Indexed: 11/21/2022] Open
Abstract
Quantitative analyses of cell replication address the connection between metabolism and growth. Various growth models approximate time-dependent cell numbers in culture media, but physiological implications of the parametrizations are vague. In contrast, isothermal microcalorimetry (IMC) measures with unprecedented sensitivity the heat (enthalpy) release via chemical turnover in metabolizing cells. Hence, the metabolic activity can be studied independently of modeling the time-dependence of cell numbers. Unexpectedly, IMC traces of various origins exhibit conserved patterns when expressed in the enthalpy domain rather than the time domain, as exemplified by cultures of Lactococcus lactis (prokaryote), Trypanosoma congolese (protozoan) and non-growing Brassica napus (plant) cells. The data comply extraordinarily well with a dynamic Langmuir adsorption reaction model of nutrient uptake and catalytic turnover generalized here to the non-constancy of catalytic capacity. Formal relations to Michaelis–Menten kinetics and common analytical growth models are briefly discussed. The proposed formalism reproduces the “life span” of cultured microorganisms from exponential growth to metabolic decline by a succession of distinct metabolic phases following remarkably simple nutrient–metabolism relations. The analysis enables the development of advanced enzyme network models of unbalanced growth and has fundamental consequences for the derivation of toxicity measures and the transferability of metabolic activity data between laboratories.
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Affiliation(s)
- Karim Fahmy
- Helmholtz-Zentrum Dresden-Rossendorf, Institute of Resource Ecology, Bautzner Landstrasse 400, 01328 Dresden, Germany;
- Cluster of Excellence Physics of Life, Technische Universität Dresden, 01062 Dresden, Germany
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Worreth S, Bieger V, Rohr N, Astasov‐Frauenhoffer M, Töpper T, Osmani B, Braissant O. Cinnamaldehyde as antimicrobial in cellulose-based dental appliances. J Appl Microbiol 2022; 132:1018-1024. [PMID: 34480822 PMCID: PMC9292871 DOI: 10.1111/jam.15283] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 08/23/2021] [Accepted: 08/27/2021] [Indexed: 12/03/2022]
Abstract
AIMS In the context of minor orthodontic intervention using clear aligner technologies, we determined antimicrobial properties of a cellulose-based material loaded with essential oils such as cinnamaldehyde. METHODS AND RESULTS Isothermal microcalorimetry was used to assess the growth of bacterial biofilms at the interface between the tested material and the solid growth medium. The calorimetric data were analyzed using conventional growth models (Gompertz and Richards), and inhibition at 12 and 24 h was calculated. CONCLUSIONS The tested material showed antimicrobial properties against Staphylococcus epidermidis as well as Streptococcus mutans and Streptococcus mitis clinical isolates. The inhibition was more pronounced against S. epidermidis, for which growth rate was reduced by 70% and lag phase was extended by 12 h. For S. mutans and S. mitis, the decrease in growth rate was 20% and 10%, and the lag phase increased by 2 and 6 h, respectively. SIGNIFICANCE AND IMPACT Clear aligners for minor teeth alignment are becoming very popular. As they must be worn for at least 22 h per day for up to 40 weeks, it is important that they remain clean and do not promote caries formation or other oral infections. Therefore, introducing material with antimicrobial properties is expected to maintain oral hygiene during the aligner therapy. Here, we demonstrate the use of cinnamaldehyde for reducing microbial growth and biofilm formation on cellulose-based dental clear aligners.
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Affiliation(s)
- Sarah Worreth
- Department of Biomedical EngineeringUniversity of BaselAllschwilSwitzerland
- IUT Nancy‐BraboisUniversité de LorraineLieu‐dit Le MontetVillers‐lès‐NancyFrance
| | - Vivien Bieger
- Department ResearchUniversity Center for Dental MedicineUniversity of BaselBaselSwitzerland
| | - Nadja Rohr
- Department ResearchUniversity Center for Dental MedicineUniversity of BaselBaselSwitzerland
| | | | - Tino Töpper
- Bottmedical AGTechnologiepark BaselBaselSwitzerland
| | - Bekim Osmani
- Bottmedical AGTechnologiepark BaselBaselSwitzerland
| | - Olivier Braissant
- Department of Biomedical EngineeringUniversity of BaselAllschwilSwitzerland
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Schröder ML, Angrisani N, Fadeeva E, Hegermann J, Reifenrath J. Laser-structured spike surface shows great bone integrative properties despite infection in vivo. MATERIALS SCIENCE & ENGINEERING. C, MATERIALS FOR BIOLOGICAL APPLICATIONS 2019; 109:110573. [PMID: 32228937 DOI: 10.1016/j.msec.2019.110573] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2019] [Revised: 11/25/2019] [Accepted: 12/18/2019] [Indexed: 12/18/2022]
Abstract
Implant associated infections can result in devastating consequences for patients. One major cause is the formation of bacterial biofilms, which result in increased resistance against antimicrobial therapeutics. A reduction of implant associated infections can be achieved by functionalization of implant surfaces. The generation of three dimensional surface structures by femtosecond laser ablation is one method to fabricate bacterial repellent large scaled surfaces without altering the material chemical composition. The challenge is to reduce bacterial growth while improving cellular ongrowth. For this purpose, spike structures were created as small as possible by used fabrication method on cubic Ti90/Al6/V4-rods and their effectiveness against bacterial colonization was compared to unstructured Ti90/Al6/V4-rods. Rods were implanted in the rat tibia and infected intraoperatively with 103 CFU of Staphylococcus aureus. Besides clinical behaviour and lameness, the vital bacterial biomass, morphological appearance and the volume of eukaryotic cells were determined on the implant surface after 21 days. Bone alterations were examined by radiological and histological techniques. Unexpectedly, the laser-structured implants did not show a lower bacterial load on the implant surface and less severe infection related bone and tissue alterations compared to the group without structuring. Simultaneously, a better bony integration and a higher cellular colonization with eukaryotic cells was detected on the laser-structured implants. These findings don't support the previous in vitro results. Nevertheless, the strong integration into the bone is a powerful argument for further surface modifications focussing on the improvement of the antibacterial effect. Additionally, our results underline the need for in vivo testing of new materials prior to clinical use.
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Affiliation(s)
- M-L Schröder
- Hannover Medical School, Clinic for Orthopedic Surgery, Anna-von-Borries Str. 1-9, 30625 Hannover, Germany; University of Veterinary Medicine Hannover, Foundation, Small Animal Clinic, Bünteweg 9, 30559 Hannover, Germany
| | - N Angrisani
- Hannover Medical School, Clinic for Orthopedic Surgery, Anna-von-Borries Str. 1-9, 30625 Hannover, Germany
| | - E Fadeeva
- Laser Zentrum Hannover e.V., Hollerithallee 8, 30419 Hannover, Germany
| | - J Hegermann
- Hannover Medical School, Institute of Functional an Applied Anatomy, Research Core Unit Electron Microscopy, Carl-Neuberg-Str. 1, 30625 Hannover, Germany
| | - J Reifenrath
- Hannover Medical School, Clinic for Orthopedic Surgery, Anna-von-Borries Str. 1-9, 30625 Hannover, Germany.
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Meininger M, Meininger S, Groll J, Gbureck U, Moseke C. Silver and copper addition enhances the antimicrobial activity of calcium hydroxide coatings on titanium. JOURNAL OF MATERIALS SCIENCE. MATERIALS IN MEDICINE 2018; 29:61. [PMID: 29736777 DOI: 10.1007/s10856-018-6065-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Accepted: 04/18/2018] [Indexed: 06/08/2023]
Abstract
Electrochemically assisted deposition of Ca(OH)2 (Portlandite) coatings on titanium surfaces has been proven as a promising method to provide the substrate with a most desirable combination of significant bacterial growth reduction on one hand and good biocompatibility on the other. Due to the rapid in vivo transformation of Ca(OH)2 to hydroxyapatite, the antimicrobial activity will be an ephemeral property of the coating when implanted into the human body. In this study, the ability to reduce bacterial growth of such portlandite coatings was significantly enhanced by an ionic modification with copper and silver ions. Antibacterial tests revealed a noticeably elevated reduction of bacterial growth, especially for copper and even at a relatively low copper content of about 0.3 wt.%. In addition, the cytocompatibility, a crucial prerequisite for potential in vivo biocompatibility, of the copper-modified coating was comparable to pure calcium hydroxide coatings.
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Affiliation(s)
- M Meininger
- Department for Functional Materials in Medicine and Dentistry, School of Dentistry, University of Würzburg, Pleicherwall 2, D-97070, Würzburg, Germany
| | - S Meininger
- Department for Functional Materials in Medicine and Dentistry, School of Dentistry, University of Würzburg, Pleicherwall 2, D-97070, Würzburg, Germany
| | - J Groll
- Department for Functional Materials in Medicine and Dentistry, School of Dentistry, University of Würzburg, Pleicherwall 2, D-97070, Würzburg, Germany
| | - U Gbureck
- Department for Functional Materials in Medicine and Dentistry, School of Dentistry, University of Würzburg, Pleicherwall 2, D-97070, Würzburg, Germany.
| | - C Moseke
- Institute for Biomedical Engineering (IBMT), University of Applied Sciences Mittelhessen (THM), Wiesenstraße 14, D-35390, Gießen, Germany
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von Ah U, Shani N, Chollet M, Solokhina A, Braissant O. Measuring antibiotic resistance in mixed cultures: Isothermal microcalorimetry as a novel analytical tool. Int Dairy J 2018. [DOI: 10.1016/j.idairyj.2017.09.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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Butini ME, Gonzalez Moreno M, Czuban M, Koliszak A, Tkhilaishvili T, Trampuz A, Di Luca M. Real-Time Antimicrobial Susceptibility Assay of Planktonic and Biofilm Bacteria by Isothermal Microcalorimetry. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2018; 1214:61-77. [DOI: 10.1007/5584_2018_291] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Ying G, Zhang S, Hu Y, Yang M, Chen P, Wu X, Guo W, Kong W. Antibacterial evaluation of Salvia miltiorrhizae on Escherichia coli by microcalorimetry coupled with chemometrics. AMB Express 2017; 7:65. [PMID: 28303551 PMCID: PMC5355400 DOI: 10.1186/s13568-017-0359-4] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2017] [Accepted: 03/02/2017] [Indexed: 04/08/2023] Open
Abstract
For seeking novel antibacterial agents with high efficacy and low toxicity to deal with drug resistance, the effects of Salvia miltiorrhizae from various sources on Escherichia coli were evaluated by microcalorimetry coupled with chemometrics. Firstly, the heat-flow power-time curves of E. coli growth affected by different S. miltiorrhizae samples were recorded. Then, some crucial quantitative thermo-kinetic parameters including growth rate constant, heat-flow power and heat output, etc. were obtained from theses curves and were further investigated by some powerful chemometric techniques including similarity analysis, multivariate analysis of variance, hierarchical clustering analysis and principle component analysis. By analyzing the principle parameters, growth rate constant of the second exponential phase (k 2) and the heat-flow output powers of the second highest peak (P 2), together with the derived parameter inhibitory ratio (I, %), it could be quickly concluded that the tested S. miltiorrhizae samples from different sources in China exhibited strong antibacterial effects on E. coli and the samples from Beijing city exhibited the strongest anti-E. coli effects, which might be used as novel and underlying antibacterial candidates for the resistance of E. coli to the existing drugs in practice. This study provides a useful tool and helpful idea to accurately and rapidly evaluate the antibacterial effects of some complex matrices, offering some references for exploring new antibacterial agents.
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Affiliation(s)
- Guangyao Ying
- Pharmacy College, Jinzhou Medical University, Jinzhou, 121001 China
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100193 China
| | - Shanshan Zhang
- Pharmacy College, Jinzhou Medical University, Jinzhou, 121001 China
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100193 China
| | - Yuli Hu
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100193 China
- College of Traditional Chinese Medicine, Jilin Agricultural University, Changchun, 130118 China
| | - Meihua Yang
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100193 China
| | - Ping Chen
- Guizhou Xinbang Pharmaceutical Co. Ltd., Guiyang, 550014 People’s Republic of China
| | - Xiaoru Wu
- Guizhou Xinbang Pharmaceutical Co. Ltd., Guiyang, 550014 People’s Republic of China
| | - Weiying Guo
- Pharmacy College, Jinzhou Medical University, Jinzhou, 121001 China
| | - Weijun Kong
- Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, 100193 China
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Solokhina A, Brückner D, Bonkat G, Braissant O. Metabolic activity of mature biofilms of Mycobacterium tuberculosis and other non-tuberculous mycobacteria. Sci Rep 2017; 7:9225. [PMID: 28835629 PMCID: PMC5569076 DOI: 10.1038/s41598-017-10019-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2017] [Accepted: 08/02/2017] [Indexed: 11/08/2022] Open
Abstract
Mycobacteria are classified into two groups, fast- and slow-growing. Often, fast-growing mycobacteria are assumed to have a higher metabolic activity than their slower counterparts, but in mature biofilms this assumption might not be correct. Indeed, when measuring the metabolic activity of mycobacterial biofilms with two independent non-invasive techniques (isothermal microcalorimetry and tunable diode laser absorption spectrometry), mature biofilms of slow- and fast-growing species appeared more alike than expected. Metabolic heat production rate was 2298 ± 181 µW for M. smegmatis and 792 ± 81 µW for M. phlei, while M. tuberculosis and M. bovis metabolic heat production rates were between these values. These small differences were further confirmed by similar oxygen consumption rates (3.3 ± 0.2 nMole/s and 1.7 ± 0.3 nMole/s for M. smegmatis and M. tuberculosis, respectively). These data suggest that the metabolic potential of slow-growing mycobacterial biofilms has been underestimated, particularly for pathogenic species.
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Affiliation(s)
- Anna Solokhina
- Center of Biomechanics & Biocalorimetry, University Basel, Gewerbestr. 14, CH-4123, Allschwil, Switzerland
| | - David Brückner
- Center of Biomechanics & Biocalorimetry, University Basel, Gewerbestr. 14, CH-4123, Allschwil, Switzerland
- F. Hoffmann - La Roche, Ltd., Sterile Drug Product Manufacturing, Wurmisweg, CH-4303, Kaiseraugst, Switzerland
| | - Gernot Bonkat
- Alta Uro AG, Centralbahnplatz 6, CH-4051, Basel, Switzerland
| | - Olivier Braissant
- Center of Biomechanics & Biocalorimetry, University Basel, Gewerbestr. 14, CH-4123, Allschwil, Switzerland.
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Gou Y, Yang X, He L, Xu X, Liu Y, Liu Y, Gao Y, Huang Q, Liang K, Ding C, Li J, Zhao C, Li J. Bio-inspired peptide decorated dendrimers for a robust antibacterial coating on hydroxyapatite. Polym Chem 2017. [DOI: 10.1039/c7py00811b] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
SSP-PAMAM-NH2 inspired by the salivary statherin protein can tightly adsorb on the HA surface to achieve long-term antibacterial activity.
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Silver-Containing Hydroxyapatite Coating Reduces Biofilm Formation by Methicillin-Resistant Staphylococcus aureus In Vitro and In Vivo. BIOMED RESEARCH INTERNATIONAL 2016; 2016:8070597. [PMID: 28105433 PMCID: PMC5220461 DOI: 10.1155/2016/8070597] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/07/2016] [Revised: 12/01/2016] [Accepted: 12/07/2016] [Indexed: 11/17/2022]
Abstract
Biofilm-producing bacteria are the principal causes of infections associated with orthopaedic implants. We previously reported that silver-containing hydroxyapatite (Ag-HA) coatings exhibit high antibacterial activity against methicillin-resistant Staphylococcus aureus (MRSA). In the present study, we evaluated the effects of Ag-HA coating of implant surfaces on biofilm formation. Titanium disks (14-mm diameter, 1-mm thickness), one surface of which was coated with HA or 0.5%-3.0% Ag-HA with a thermal spraying technique, were used. In vitro, the disks were inoculated with an MRSA suspension containing 4 × 105 CFU and incubated for 1-2 weeks. In vivo, MRSA-inoculated HA and 3% Ag-HA disks (8.8-10.0 × 108 CFU) were implanted subcutaneously on the back of rats for 1-7 days. All disks were subsequently stained with a biofilm dye and observed under a fluorescence microscope, and biofilm coverage rates (BCRs) were calculated. The BCRs on the Ag-HA coating were significantly lower than those on the HA coating at all time points in vitro (p < 0.05). Similar results were observed in vivo (p < 0.001) without argyria. Ag-HA coating reduced biofilm formation by MRSA in vitro and in vivo; therefore, Ag-HA coating might be effective for reducing implant-associated infections.
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Evaluation of calcium dihydroxide- and silver-coated implants in the rat tibia. J Appl Biomater Funct Mater 2016; 14:e441-e448. [PMID: 27647385 DOI: 10.5301/jabfm.5000323] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/15/2016] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND Silver ions (Ag+) have strong antibacterial effects, and silver-coated materials are in widespread clinical use. However, the application of silver-coated medical devices is not without concerns: its use with direct bone contact is not established, and systemic toxic side effects of released Ag+ have been described. Therefore, alternative bactericidal coatings with a more localized way of acting - e.g., calcium dihydroxide, Ca(OH)2 (CH) - would be advantageous. METHODS A new rat model of the animal's tibial metaphysis was developed. In the left proximal tibiae of 36 male Wistar rats, titanium screws were implanted. The screws were coated with hydroxyapatite (HA; 12 animals: group I), low-dosed HA silver (HA-Ag; 12 animals: group II) and CH (12 animals: group III). After 6 weeks, all rats were sacrificed. The implants were evaluated for morphological changes on their surfaces, by light microscopy, scanning electron microscopy and energy-dispersive X-ray spectroscopy; for osteointegration, by measurement of resistance to removal; and for bacterial colonization, by quantitative culture analysis. Additionally, the tibial bone was investigated histologically for signs of osteomyelitis and sonicated to detect bacterial loads. RESULTS (i) No microbiological or histological signs of infection could be determined on any of the screws or the surrounding bone. (ii) The bone-implant interface analysis revealed extensive bone formation and direct bone-implant contact on all HA, HA-Ag and HA-CH coated screws. (iii) HA and HA-Ag were partially, and CH was fully, degraded on the screw coating, allowing host bone to osteointegrate.
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Harrasser N, Gorkotte J, Obermeier A, Feihl S, Straub M, Slotta-Huspenina J, von Eisenhart-Rothe R, Moser W, Gruner P, de Wild M, Gollwitzer H, Burgkart R. A new model of implant-related osteomyelitis in the metaphysis of rat tibiae. BMC Musculoskelet Disord 2016; 17:152. [PMID: 27060078 PMCID: PMC4826501 DOI: 10.1186/s12891-016-1005-z] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/18/2015] [Accepted: 03/31/2016] [Indexed: 11/10/2022] Open
Abstract
Background Animal models serve as an important tool to understand peri-implant infection. Most of the models use high bacterial loads (>104 colony forming units, CFU) to provide high infection rates. Therefore these animals evolve rather similarly, making comparison between groups and statistical analysis possible. On the other hand, to mimic clinical constellation of surgery-related infections the use of low amounts of bacteria would be more advantageous. Methods We developed a metaphyseal rat model of peri-implant bone infection with low amount of bacterial loads (102 and 103 CFU of Staphylococcus aureus) and investigated osseointegration of the implants coated with hydroxyapatite (HA) and low-dosed HA-silver (HA-Ag). Non-infected implants served as controls. After 6 weeks rats were sacrificed and implants evaluated for osseointegration and infection. Results Infection of implanted devices was reliably induced, independently whether 102 or 103 CFU of S. aureus were inoculated and HA or HA-Ag coated implants were used. No systemic infection was present in any of the animals at the time of sacrifice, and no animal developed acute infection requiring premature sacrifice. All CFU counts of the implant and the bone at sacrifice were significantly higher than the inoculated load (p < .05). All sterilely inserted implants showed excellent osseointegration and no infection. Conclusions Our present study of a rat tibia model reliably induced osteomyelitis in the metaphysis with low-doses of bacteria. The addition of low-dosed Ag to the implant coating was not able to reduce the infection rates. The results demonstrate that it is possible to develop a model of implant-related osteomyelitis in rats with low amounts of bacteria to better mimic clinical constellations. No other promoters of infection besides insertion of the screw implant were used in this model.
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Affiliation(s)
- Norbert Harrasser
- Clinic of Orthopedics and Sports Orthopedics, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany.
| | - Johannes Gorkotte
- Clinic of Orthopedics and Sports Orthopedics, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - Andreas Obermeier
- Clinic of Orthopedics and Sports Orthopedics, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - Susanne Feihl
- Institute for Medical Microbiology and Immunology, Technical University of Munich, Trogerstr. 30, 81675, Munich, Germany
| | - Melanie Straub
- Institute of Pathology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - Julia Slotta-Huspenina
- Institute of Pathology, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - Ruediger von Eisenhart-Rothe
- Clinic of Orthopedics and Sports Orthopedics, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
| | - Walter Moser
- Atesos medical AG, Schachenallee 29, CH-5000, Aarau, Switzerland
| | - Philipp Gruner
- Medicoat AG, Almuesenacherstrasse 2a, CH-5506, Maegenwil, Switzerland
| | - Michael de Wild
- University of Applied Sciences and Arts Northwestern Switzerland (FHNW), School of Life Sciences, CH-4132, Muttenz, Switzerland
| | - Hans Gollwitzer
- Clinic of Orthopedics and Sports Orthopedics, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany.,ATOS Clinic, Effnerstr.38, 81925, Munich, Germany
| | - Rainer Burgkart
- Clinic of Orthopedics and Sports Orthopedics, Klinikum rechts der Isar, Technical University of Munich, Ismaninger Str. 22, 81675, Munich, Germany
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