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Selbach S, Klocke A, Peters U, Beckert S, Watt RM, Tong R, Flemmig TF, Hensel A, Beikler T. Microbiological and Clinical Effects of a Proanthocyanidin-enriched Extract from Rumex acetosa in Periodontally Healthy Carriers of Porphyromonas gingivalis: a Randomized Controlled Pilot Study. PLANTA MEDICA 2023; 89:1052-1062. [PMID: 34953469 DOI: 10.1055/a-1728-2249] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Rumex acetosa significantly inhibits the adhesion of Porphyromonas gingivalis (P. g.) to eukaryotic host cells in vitro. The objective of this randomized placebo-controlled pilot-trial was to analyze effects of a mouth rinse containing 0.8% (w/w) of a quantified proanthocyanidin-enriched extract from Rumex acetosa (RA1) on microbiological, clinical, and cytological parameters in systemically healthy individuals without history of periodontitis, harboring P. g. intraorally. 35 subjects received a supragingival debridement (SD) followed by mouth rinsing (3 times daily) with either RA1 mouth rinse solution (test) or placebo (control) for 7 days as adjunct to routine oral hygiene. Supragingival biofilm samples were taken at screening visit, baseline (BL), 2, 4, 7 and 14 days after SD. P. g. and 11 other oral microorganisms were detected and quantified by rtPCR. Changes in the oral microbiota composition of one test and one control subject were assessed via high throughput 16S rRNS gene amplicon sequencing. Approximal Plaque Index (API) and the modified Sulcular Bleeding Index (SBI) were assessed at BL, 7- and 14-days following SD. Brush biopsies were taken at BL and 14 d following SD. Intergroup comparisons revealed no significant microbiological, cytological, and clinical differences at any timepoint. However, a significant reduction in SBI at day 14 (p = 0.003) and API at day 7 (p = 0.02) and day 14 (p = 0.009) was found in the test group by intragroup comparison. No severe adverse events were observed. The results indicate that RA1 mouth rinse is safe but does not seem to inhibit colonization of P. g. or improve periodontal health following SD.
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Affiliation(s)
- Sabine Selbach
- Adelaide Dental School, The University of Adelaide, Adelaide, Australia
| | | | - Ulrike Peters
- Department of Periodontics, Preventive and Restorative Dentistry, University Medical Center Eppendorf, Hamburg, Germany
| | - Sabine Beckert
- Institute of Pharmaceutical Biology and Phytochemistry, University of Münster, Münster, Germany
| | - Rory Munro Watt
- Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, Peoples' Republic of China
| | - Raymond Tong
- Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, Peoples' Republic of China
| | - Thomas Frank Flemmig
- Faculty of Dentistry, The University of Hong Kong, Hong Kong SAR, Peoples' Republic of China
| | - Andreas Hensel
- Institute of Pharmaceutical Biology and Phytochemistry, University of Münster, Münster, Germany
| | - Thomas Beikler
- Department of Periodontics, Preventive and Restorative Dentistry, University Medical Center Eppendorf, Hamburg, Germany
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2
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Laugisch O, Auschill TM, Tumbrink A, Sculean A, Arweiler NB. Influence of Anti-Infective Periodontal Therapy on Subgingival Microbiota Evaluated by Chair-Side Test Compared to qPCR—A Clinical Follow-Up Study. Antibiotics (Basel) 2022; 11:antibiotics11050577. [PMID: 35625221 PMCID: PMC9137526 DOI: 10.3390/antibiotics11050577] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 04/14/2022] [Accepted: 04/21/2022] [Indexed: 01/27/2023] Open
Abstract
A chair-side test (CST) for five periodontal pathogens (Aggregatibacter actinomycetemcomitans, A.a.; Porphyromonas gingivalis, P.g.; Prevotella intermedia, P.i.; Treponema denticola, T.d.; Tannerella forsythia, T.f.) was compared with qPCR in a previous clinical study on 100 periodontitis patients at first diagnosis (T0). Following non-surgical treatment alone (SRP) or in combination with systemic or local antibiotics, 74 patients (57.4 ± 13.5 years) were again tested at the same sites from 14 to 24 months after T0. Bacterial elimination (%; compared to T0) was determined for each single species and compared between both test systems. In all patients, all five pathogens could not be fully eliminated regardless of therapy or test method. Tested with CST, the mean elimination ranged from 90% for SRP + Amoxicillin/Metronidazole to 59.13% for SRP only. The corresponding qPCR values were 30% and 29.6%. Only A.a. was eradicated in 100% by SRP + Amoxicillin/Metronidazole tested by CST, and it was 80% when qPCR was the test method. CST agreed with qPCR in 98.7% in the detection of A.a., and 74.3%, 78.4%, 73.0%, and 48.7% for P.g., P.i., T.d., and T.f., respectively. Neither conventional treatment nor the additional use of antibiotics—even with the correct indication—could completely eradicate the tested pathogens or prevent pocket reinfection.
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Affiliation(s)
- Oliver Laugisch
- Department of Periodontology and Peri-Implant Diseases, Philipps-University, 35039 Marburg, Germany; (O.L.); (T.M.A.); (A.T.)
| | - Thorsten M. Auschill
- Department of Periodontology and Peri-Implant Diseases, Philipps-University, 35039 Marburg, Germany; (O.L.); (T.M.A.); (A.T.)
| | - Anne Tumbrink
- Department of Periodontology and Peri-Implant Diseases, Philipps-University, 35039 Marburg, Germany; (O.L.); (T.M.A.); (A.T.)
- Private Practice, 48324 Sendenhorst, Germany
| | - Anton Sculean
- Department of Periodontology, School of Dental Medicine, University of Bern, 3010 Bern, Switzerland;
| | - Nicole B. Arweiler
- Department of Periodontology and Peri-Implant Diseases, Philipps-University, 35039 Marburg, Germany; (O.L.); (T.M.A.); (A.T.)
- Correspondence:
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3
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Sereti M, Zekeridou A, Cancela J, Mombelli A, Giannopoulou C. Microbiological testing of clinical samples before and after periodontal treatment. A comparative methodological study between real-time PCR and real-time-PCR associated to propidium monoazide. Clin Exp Dent Res 2021; 7:1069-1079. [PMID: 34216116 PMCID: PMC8638278 DOI: 10.1002/cre2.464] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2021] [Revised: 05/10/2021] [Accepted: 05/31/2021] [Indexed: 12/02/2022] Open
Abstract
Objectives The aim of the present methodological study was to evaluate the discrepancies in the detection of a number of periodontally involved pathogenic bacteria obtained from clinical samples by two methods: the quantitative Polymerase Chain Reaction (qPCR) and the qPCR combined with pre‐treatment by Propidium Monoazide (PMA). Material and methods Plaque and saliva samples were obtained from 30 subjects: 20 subjects with chronic or aggressive periodontitis in need of periodontal therapy with or without antibiotics and 10 subjects in Supportive Periodontal Treatment (SPT). The clinical samples taken before treatment (BL) and 1 month later (M1), were divided in two aliquots: one was immediately treated with PMA while the other was left untreated. All samples were further analyzed with qPCR after DNA extraction, for the detection of Aggregatibacter actinomycetemcomitans (Aa), Porphyromonas gingivalis (Pg), Tannerella forsythia (Tf), Treponema denticola (Td), Parvimonas micra (Pm), and Prevotella intermedia (Pi). Results Large inter‐individual variations were observed in the concentration of the studied bacteria. At both instances (BL and M1) and for the three groups, significantly lower counts of bacteria were depicted when plaque and saliva samples were pre‐treated with PMA as compared to those without treatment. Treatment resulted in significant decreases in the number of bacteria, mainly in the plaque samples. However, these changes were almost similar in the three groups independently of the method of detection used (PMA‐qPCR vs. q‐PCR). Conclusion Removal of DNA from non‐viable cells with PMA treatment is an easily applied step added to the classical qPCR that could give accurate information on the presence of viable bacterial load and evaluate the response to periodontal treatment.
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Affiliation(s)
- Maria Sereti
- Division of Regenerative Dentistry and Periodontology, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland
| | - Alkisti Zekeridou
- Division of Regenerative Dentistry and Periodontology, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland
| | - Jose Cancela
- Division of Regenerative Dentistry and Periodontology, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland
| | - Andrea Mombelli
- Division of Regenerative Dentistry and Periodontology, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland
| | - Catherine Giannopoulou
- Division of Regenerative Dentistry and Periodontology, University Clinics of Dental Medicine, University of Geneva, Geneva, Switzerland
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Gomes SC, Fachin S, da Fonseca JG, Angst PDM, Lamers ML, da Silva ISB, Nunes LN. Dental biofilm of symptomatic COVID-19 patients harbours SARS-CoV-2. J Clin Periodontol 2021; 48:880-885. [PMID: 33899251 PMCID: PMC8251434 DOI: 10.1111/jcpe.13471] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 04/08/2021] [Accepted: 04/09/2021] [Indexed: 12/12/2022]
Abstract
Aims SARS‐CoV‐2 RNA has been recovered from different sites in the human body, including the mouth. The present study aimed to investigate the presence of SARS‐CoV‐2 RNA in the dental biofilm of symptomatic patients who tested positive in nasopharyngeal and oropharyngeal (NASO/ORO) samples. Materials & Methods An observational clinical study of individuals with flu‐like symptoms was conducted between July and September 2020. Dental biofilm (BIO) samples were collected and analysed using real‐time quantitative polymerase chain reaction (RT‐qPCR) to determine the virus's presence. Results Seventy participants (40 ± 9.8 years of age, 71.4% female) tested positive for SARS‐CoV‐2 RNA in NASO/ORO samples and were included in the study. Among them, 13 tested positive in BIO samples (18.6%; 95% CI: [9.5, 27.7]). The median and interquartile range of cycle quantification (Cq) for NASO/ORO and BIO samples were 15.9 [6.9] and 35.9 [4.0] (p = .001), respectively. BIO‐positive participants showed a higher virus load in NASO/ORO samples (p = .012) than those testing negative (Cq = 20.4 [6.1]). Conclusions Dental biofilms from symptomatic COVID‐19 patients harbour SARS‐CoV‐2 RNA and might be a potential reservoir with an essential role in COVID‐19 transmission.
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Affiliation(s)
- Sabrina Carvalho Gomes
- Department of Conservative Dentistry, Dentistry School, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.,Hospital de Clínicas de Porto Alegre, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Sabrina Fachin
- Resident in Periodontology, Dental Faculty, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | | | - Patrícia Daniela Melchiors Angst
- Department of Conservative Dentistry, Dentistry School, Federal University of Rio Grande do Sul, Porto Alegre, Brazil.,Hospital de Clínicas de Porto Alegre, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Marcelo Lazzaron Lamers
- Department of Morphological Sciences, Dentistry School, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Ilma Simoni Brum da Silva
- Department of Physiology, Basic Health Science Institute, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
| | - Luciana Neves Nunes
- Mathematics and Statistics Institute, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
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5
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Leblhuber F, Huemer J, Steiner K, Gostner JM, Fuchs D. Knock-on effect of periodontitis to the pathogenesis of Alzheimer's disease? Wien Klin Wochenschr 2020; 132:493-498. [PMID: 32215721 PMCID: PMC7519001 DOI: 10.1007/s00508-020-01638-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2019] [Accepted: 03/07/2020] [Indexed: 12/20/2022]
Abstract
Background Alzheimer’s disease has chronic inflammatory components, which can be enhanced by systemic immune activation resulting in inflammation or vice versa. There is growing evidence that chronic periodontitis drives systemic inflammation and finally Alzheimer’s disease. Thus, a link might exist between oral pathogens and Alzheimer’s disease. This may be of special significance as there is an age-related incidence of chronic periodontitis. Methods In this study, 20 consecutive patients with probable Alzheimer’s disease were investigated. Diagnosis was established by cognitive tests, routine laboratory tests and cerebral magnetic resonance tomography. In 35% of these patients with cognitive impairment pathogenic periodontal bacteria were found. Results The presence of Porphyromonas gingivalis, the key pathogen and one of the species involved in chronic periodontitis, was found to be associated with lower mini mental state examination scores (p < 0.05) and with a tendency to lower scores in the clock drawing test (p = 0.056). Furthermore, association between lower serum concentrations of the immune biomarker neopterin and the presence of Treponema denticola (p < 0.01) as well as of kynurenine were found in Alzheimer patients positive vs. negative for Tannerella forsytia (p < 0.05). Conclusions Data indicate a possible association of specific periodontal pathogens with cognitive impairment, Treponema denticola and Tannerella forsytia may alter the host immune response in Alzheimer’s disease. Albeit still preliminary, findings of the study may point to a possible role of an altered salivary microbiome as a causal link between chronic periodontitis and cognitive impairment in Alzheimer’s disease.
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Affiliation(s)
| | - Julia Huemer
- Freelance Certified Dental Hygienist, Linz, Austria
| | - Kostja Steiner
- Department of Gerontology, Kepler University Clinic, Linz, Austria
| | - Johanna M Gostner
- Division of Medical Biochemistry, Biocenter, Innsbruck Medical University, Innsbruck, Austria
| | - Dietmar Fuchs
- Division of Biological Chemistry, Biocenter, Innsbruck Medical University, Innrain 80, 4th Floor, Room M04-313, 6020, Innsbruck, Austria.
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6
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Arweiler NB, Marx VK, Laugisch O, Sculean A, Auschill TM. Clinical evaluation of a newly developed chairside test to determine periodontal pathogens. J Periodontol 2019; 91:387-395. [DOI: 10.1002/jper.19-0180] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 07/18/2019] [Accepted: 07/21/2019] [Indexed: 12/17/2022]
Affiliation(s)
- Nicole B. Arweiler
- Department of Periodontology & Peri‐implant Diseases Philipps‐University Marburg Germany
| | - Vanessa K. Marx
- Department of Periodontology & Peri‐implant Diseases Philipps‐University Marburg Germany
| | - Oliver Laugisch
- Department of Periodontology & Peri‐implant Diseases Philipps‐University Marburg Germany
| | - Anton Sculean
- Department of Periodontology University of Bern Bern Switzerland
| | - Thorsten M. Auschill
- Department of Periodontology & Peri‐implant Diseases Philipps‐University Marburg Germany
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7
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Shahi S, Zununi Vahed S, Fathi N, Sharifi S. Polymerase chain reaction (PCR)-based methods: Promising molecular tools in dentistry. Int J Biol Macromol 2018; 117:983-992. [DOI: 10.1016/j.ijbiomac.2018.05.085] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2018] [Revised: 05/13/2018] [Accepted: 05/14/2018] [Indexed: 02/06/2023]
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8
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Tomás I, Regueira-Iglesias A, López M, Arias-Bujanda N, Novoa L, Balsa-Castro C, Tomás M. Quantification by qPCR of Pathobionts in Chronic Periodontitis: Development of Predictive Models of Disease Severity at Site-Specific Level. Front Microbiol 2017; 8:1443. [PMID: 28848499 PMCID: PMC5552702 DOI: 10.3389/fmicb.2017.01443] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Accepted: 07/17/2017] [Indexed: 12/16/2022] Open
Abstract
Currently, there is little evidence available on the development of predictive models for the diagnosis or prognosis of chronic periodontitis based on the qPCR quantification of subgingival pathobionts. Our objectives were to: (1) analyze and internally validate pathobiont-based models that could be used to distinguish different periodontal conditions at site-specific level within the same patient with chronic periodontitis; (2) develop nomograms derived from predictive models. Subgingival plaque samples were obtained from control and periodontal sites (probing pocket depth and clinical attachment loss <4 mm and >4 mm, respectively) from 40 patients with moderate-severe generalized chronic periodontitis. The samples were analyzed by qPCR using TaqMan probes and specific primers to determine the concentrations of Actinobacillus actinomycetemcomitans (Aa), Fusobacterium nucleatum (Fn), Parvimonas micra (Pm), Porphyromonas gingivalis (Pg), Prevotella intermedia (Pi), Tannerella forsythia (Tf), and Treponema denticola (Td). The pathobiont-based models were obtained using multivariate binary logistic regression. The best models were selected according to specified criteria. The discrimination was assessed using receiver operating characteristic curves and numerous classification measures were thus obtained. The nomograms were built based on the best predictive models. Eight bacterial cluster-based models showed an area under the curve (AUC) ≥0.760 and a sensitivity and specificity ≥75.0%. The PiTfFn cluster showed an AUC of 0.773 (sensitivity and specificity = 75.0%). When Pm and AaPm were incorporated in the TdPiTfFn cluster, we detected the two best predictive models with an AUC of 0.788 and 0.789, respectively (sensitivity and specificity = 77.5%). The TdPiTfAa cluster had an AUC of 0.785 (sensitivity and specificity = 75.0%). When Pm was incorporated in this cluster, a new predictive model appeared with better AUC and specificity values (0.787 and 80.0%, respectively). Distinct clusters formed by species with different etiopathogenic role (belonging to different Socransky’s complexes) had a good predictive accuracy for distinguishing a site with periodontal destruction in a periodontal patient. The predictive clusters with the lowest number of bacteria were PiTfFn and TdPiTfAa, while TdPiTfAaFnPm had the highest number. In all the developed nomograms, high concentrations of these clusters were associated with an increased probability of having a periodontal site in a patient with chronic periodontitis.
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Affiliation(s)
- Inmaculada Tomás
- Oral Sciences Research Group, Department of Surgery and Medical Surgical Specialties, School of Medicine and Dentistry, Universidade de Santiago de Compostela, Health Research Institute of Santiago (IDIS)Santiago de Compostela, Spain
| | - Alba Regueira-Iglesias
- Oral Sciences Research Group, Department of Surgery and Medical Surgical Specialties, School of Medicine and Dentistry, Universidade de Santiago de Compostela, Health Research Institute of Santiago (IDIS)Santiago de Compostela, Spain
| | - Maria López
- Department of Microbiology, Complejo Hospitalario Universitario A Coruña-Instituto de Investigación Biomédica de A CoruñaA Coruña, Spain
| | - Nora Arias-Bujanda
- Oral Sciences Research Group, Department of Surgery and Medical Surgical Specialties, School of Medicine and Dentistry, Universidade de Santiago de Compostela, Health Research Institute of Santiago (IDIS)Santiago de Compostela, Spain
| | - Lourdes Novoa
- Oral Sciences Research Group, Department of Surgery and Medical Surgical Specialties, School of Medicine and Dentistry, Universidade de Santiago de Compostela, Health Research Institute of Santiago (IDIS)Santiago de Compostela, Spain
| | - Carlos Balsa-Castro
- Oral Sciences Research Group, Department of Surgery and Medical Surgical Specialties, School of Medicine and Dentistry, Universidade de Santiago de Compostela, Health Research Institute of Santiago (IDIS)Santiago de Compostela, Spain
| | - Maria Tomás
- Department of Microbiology, Complejo Hospitalario Universitario A Coruña-Instituto de Investigación Biomédica de A CoruñaA Coruña, Spain
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9
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Spooner R, Weigel KM, Harrison PL, Lee K, Cangelosi GA, Yilmaz Ö. In Situ Anabolic Activity of Periodontal Pathogens Porphyromonas gingivalis and Filifactor alocis in Chronic Periodontitis. Sci Rep 2016; 6:33638. [PMID: 27642101 PMCID: PMC5027532 DOI: 10.1038/srep33638] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2016] [Accepted: 08/31/2016] [Indexed: 12/17/2022] Open
Abstract
Porphyromonas gingivalis and Filifactor alocis are fastidious anaerobic bacteria strongly associated with chronic forms of periodontitis. Our understanding of the growth activities of these microorganisms in situ is very limited. Previous studies have shown that copy numbers of ribosomal-RNA precursor (pre-rRNA) of specific pathogen species relative to genomic-DNA (gDNA) of the same species (P:G ratios) are greater in actively growing bacterial cells than in resting cells. The method, so-called steady-state pre-rRNA-analysis, represents a novel culture-independent approach to study bacteria. This study employed this technique to examine the in situ growth activities of oral bacteria in periodontitis before and after non-surgical periodontal therapy. Sub-gingival paper-point samples were taken at initial and re-evaluation appointments. Pre-rRNA and gDNA levels of P. gingivalis and F. alocis were quantified and compared using reverse-transcriptase qPCR. The results indicate significantly reduced growth activity of P. gingivalis, but not F. alocis, after therapy. The P:G ratios of P. gingivalis and F. alocis were compared and a low-strength, but statistically significant inter-species correlation was detected. Our study demonstrates that steady-state pre-rRNA-analysis can be a valuable culture-independent approach to studying opportunistic bacteria in periodontitis.
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Affiliation(s)
- Ralee Spooner
- Divison of Periodontics, Department of Stomatology, Medical University of South Carolina, Charleston, SC 29425, USA.,Lieutenant, Dental Corps, Navy Professional Medicine Development Center, Bethesda, MD 20889, USA
| | - Kris M Weigel
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Peter L Harrison
- Department of Periodontology, University of Florida, Gainesville, FL 32610, USA
| | - KyuLim Lee
- Department of Periodontology, University of Florida, Gainesville, FL 32610, USA
| | - Gerard A Cangelosi
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, WA 98195, USA
| | - Özlem Yilmaz
- Department of Oral Health Sciences, Medical University of South Carolina, Charleston, SC 29425, USA.,Department of Microbiology and Immunology, Medical University of South Carolina, Charleston, SC 29425, USA
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10
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An investigation of the antibacterial ability and cytotoxicity of a novel cu-bearing 317L stainless steel. Sci Rep 2016; 6:29244. [PMID: 27385507 PMCID: PMC4935851 DOI: 10.1038/srep29244] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2016] [Accepted: 06/14/2016] [Indexed: 11/08/2022] Open
Abstract
In order to solve the challenging problem of microbial infections caused by microorganisms on medical implants, it is imperative to develop novel antimicrobial biomaterials. This work demonstrated that 317L-Cu stainless steel (SS), created by adding copper through a solution and aging heat treatment process, exhibited good antibacterial properties against staphylococcus aureus, achieving 2 log reduction of planktonic cells after 5 days of incubation. In this study, the antibacterial test was performed using the plate count method, the fluorescence cell staining method and the quantitative polymerase chain reaction (qPCR) method. It is well known that a high concentration of copper ion can lead to cytotoxicity. This work explored the cytotoxicity of 317L-Cu SS through real-time cell analysis (RTCA). Experimental results demonstrated that the 317L-Cu SS possessed a satisfactory antibacterial ability against S. aureus, and the antibacterial rate based on the reduction of sessile cell count reached 98.3% after 24-hour treatment. The bacterial adhesion and the biofilm thickness were considerably reduced by the 317L-Cu SS. The results of RTCA suggested that 317L-Cu SS did not introduce cytotoxicity to mouse cells, indicating its suitability as a medical implant material.
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