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Talapko J, Juzbašić M, Meštrović T, Matijević T, Mesarić D, Katalinić D, Erić S, Milostić-Srb A, Flam J, Škrlec I. Aggregatibacter actinomycetemcomitans: From the Oral Cavity to the Heart Valves. Microorganisms 2024; 12:1451. [PMID: 39065217 PMCID: PMC11279289 DOI: 10.3390/microorganisms12071451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2024] [Revised: 07/11/2024] [Accepted: 07/14/2024] [Indexed: 07/28/2024] Open
Abstract
Aggregatibacter actinomycetemcomitans (A. actinomycetecomitans) is a Gram-negative bacterial species that is an essential component of the oral microbiota. Due to its aggregative properties, it plays a role in the pathogenesis of human diseases. The presence of the surface proteins Fim, Briae, and microvesicles enables the bacterium to adhere to the epithelial surface and the tooth's surface. The presence of leukotoxin A (LtxA), which plays an important role in the pathogenicity of the bacterium, has been associated with both periodontitis and the etiology of rheumatoid arthritis (RA). A. actinomycetecomitans is also associated with several other systemic diseases and complications, such as endocarditis and different abscesses. In addition to leukotoxin A, A. actinomycetecomitans possesses several different virulence factors, including bacteriocins, chemotaxis inhibitory factors, cytotoxic factors, Fc-binding proteins, immunosuppressive factors, lipopolysaccharide collagenase, fibroblast inhibitory factors, antibiotic resistance determinants, adhesins, invasive factors and factors that inhibit the function of polymorphonuclear leukocytes. The ability of A. actinomycetemcomitans lipopolysaccharide to induce macrophages to secrete the interleukins IL-1, IL-1β, and tumor necrosis factor (TNF) is of considerable importance. The primary etiologic factor in the pathogenesis of periodontal disease is the oral biofilm colonized by anaerobic bacteria. Among these, A. actinomycetemcomitans occupies an important place as a facultative anaerobic bacterium. In addition, A. actinomycetemcomitans possesses many virulence factors that contribute to its potential to cause cancer. This article provides an overview of the virulence factors of A. actinomycetecomitans and its association with various systemic diseases, its oncogenic potential, and the treatment options for infections caused by A. actinomycetecomitans.
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Affiliation(s)
- Jasminka Talapko
- Faculty of Dental Medicine and Health, Josip Juraj Strossmayer University of Osijek, 31000 Osijek, Croatia (D.K.)
| | - Martina Juzbašić
- Faculty of Dental Medicine and Health, Josip Juraj Strossmayer University of Osijek, 31000 Osijek, Croatia (D.K.)
| | - Tomislav Meštrović
- University Centre Varaždin, University North, 42000 Varaždin, Croatia
- Institute for Health Metrics and Evaluation, University of Washington, Seattle, WA 98195, USA
- Department for Health Metrics Sciences, School of Medicine, University of Washington, Seattle, WA 98195, USA
| | - Tatjana Matijević
- Faculty of Dental Medicine and Health, Josip Juraj Strossmayer University of Osijek, 31000 Osijek, Croatia (D.K.)
- Department of Dermatology and Venereology, Clinical Hospital Center Osijek, 31000 Osijek, Croatia
| | - Dora Mesarić
- Faculty of Dental Medicine and Health, Josip Juraj Strossmayer University of Osijek, 31000 Osijek, Croatia (D.K.)
- Department of Radiotherapy and Oncology, University Hospital Center Osijek, 31000 Osijek, Croatia
| | - Darko Katalinić
- Faculty of Dental Medicine and Health, Josip Juraj Strossmayer University of Osijek, 31000 Osijek, Croatia (D.K.)
- Faculty of Medicine, Josip Juraj Strossmayer University of Osijek, 31000 Osijek, Croatia
| | - Suzana Erić
- Faculty of Dental Medicine and Health, Josip Juraj Strossmayer University of Osijek, 31000 Osijek, Croatia (D.K.)
- Department of Radiotherapy and Oncology, University Hospital Center Osijek, 31000 Osijek, Croatia
- Faculty of Medicine, Josip Juraj Strossmayer University of Osijek, 31000 Osijek, Croatia
| | - Andrea Milostić-Srb
- Faculty of Dental Medicine and Health, Josip Juraj Strossmayer University of Osijek, 31000 Osijek, Croatia (D.K.)
| | - Josipa Flam
- Department of Radiotherapy and Oncology, University Hospital Center Osijek, 31000 Osijek, Croatia
- Faculty of Medicine, Josip Juraj Strossmayer University of Osijek, 31000 Osijek, Croatia
| | - Ivana Škrlec
- Faculty of Dental Medicine and Health, Josip Juraj Strossmayer University of Osijek, 31000 Osijek, Croatia (D.K.)
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Manara S, Beghini F, Masetti G, Armanini F, Geat D, Galligioni G, Segata N, Farina S, Cristofolini M. Thermal Therapy Modulation of the Psoriasis-Associated Skin and Gut Microbiome. Dermatol Ther (Heidelb) 2023; 13:2769-2783. [PMID: 37768448 PMCID: PMC10613183 DOI: 10.1007/s13555-023-01036-5] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 09/08/2023] [Indexed: 09/29/2023] Open
Abstract
INTRODUCTION Psoriasis is a systemic immune-mediated disease primarily manifesting as skin redness and inflammation. Balneotherapy proved to be a successful non-pharmacological option to reduce the skin areas affected by the disease, but the specific mechanisms underlying this effect have not been elucidated yet. Here we test the hypothesis that the effect of thermal treatments on psoriatic lesions could be partially mediated by changes in the resident microbial population, i.e., the microbiome. METHODS In this study, we enrolled patients with psoriasis and monitored changes in their skin and gut microbiome after a 12-bath balneotherapy course with a combination of 16S rRNA amplicon sequencing and metagenomics. Changes in the resident microbiome were then correlated with thermal therapy outcomes evaluated as changes in Psoriasis Area and Severity Index (PASI) and Body Surface Area index (BSA). RESULTS The amplicon sequencing analysis of the skin microbiome showed that after thermal treatment the microbiome composition of affected areas improved to approach that typical of unaffected skin. We moreover identified some low-abundance bacterial biomarkers indicative of disease status and treatment efficacy, and we showed via metagenomic sequencing that thermal treatments and thermal water drinking affect the fecal microbiome to host more species associated with favorable metabolic health. CONCLUSIONS Changes in lower-abundance microbial taxa presence and abundance could be the basis for the positive effect of thermal water treatment and drinking on the cutaneous and systemic symptomatology of psoriasis.
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Affiliation(s)
- Serena Manara
- Laboratory of Computational Metagenomics, Department CIBIO, University of Trento, Via Sommarive 9, Povo, 38123, Trento, Italy
| | - Francesco Beghini
- Laboratory of Computational Metagenomics, Department CIBIO, University of Trento, Via Sommarive 9, Povo, 38123, Trento, Italy
- Yale Institute for Network Science, Yale University, New Haven, CT, USA
| | - Giulia Masetti
- Laboratory of Computational Metagenomics, Department CIBIO, University of Trento, Via Sommarive 9, Povo, 38123, Trento, Italy
| | - Federica Armanini
- Laboratory of Computational Metagenomics, Department CIBIO, University of Trento, Via Sommarive 9, Povo, 38123, Trento, Italy
| | - Davide Geat
- Department of Dermatology, ASST Spedali Civili Di Brescia, Brescia, Italy
| | - Giulia Galligioni
- Clinical Unit of Occupational Medicine, Health Agency Trento, Trento, Italy
| | - Nicola Segata
- Laboratory of Computational Metagenomics, Department CIBIO, University of Trento, Via Sommarive 9, Povo, 38123, Trento, Italy.
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Lotfy WA, Matar MA, Alkersh BM. Evaluation of the antibacterial activity of cinnamon essential oil and its individual compounds on Aggregatibacter actinomycetemcomitans isolated from black extrinsic tooth stain: an in vitro study. Eur Arch Paediatr Dent 2023; 24:661-674. [PMID: 37747658 PMCID: PMC10600304 DOI: 10.1007/s40368-023-00841-y] [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: 08/12/2022] [Accepted: 08/30/2023] [Indexed: 09/26/2023]
Abstract
AIM Black extrinsic tooth stain (BETS) is a health challenge that commonly affects children. Aggregatibacter actinomycetemcomitans (Aa) presents in higher prevalence within the polymicrobial community of BETS. In this study, the anti-planktonic and anti-sessile activities of cinnamon essential oil (CEO) and its individual compounds against Aa were evaluated. The preventive effect of CEO and its active substances on BETS formation was also studied in vitro. METHODS Aa was isolated from a preschool child with BETS and was identified based on the morphological characteristics, MALDI-TOF mass spectroscopy and 16S rRNA sequencing. The effect of CEO and its individual compounds on the growth kinetics of planktonic and sessile Aa cells as well as their antibacterial efficacy and their rate of bacterial killing were examined. The preventive effect of CEO and its active substances on the formation of BETS was evaluated using an ex vivo model. The data were analysed using one-way analysis of variance (ANOVA) and the significance level was set at p < 0.05. RESULTS Out of eight individual compounds of CEO, only eugenol, cinnamaldehyde and α-methyl cinnamaldehyde showed anti-Aa activities. The values of the minimum inhibitory concentrations (MICs) were in the following order: CEO (421.5 mg/ml) > α-methyl cinnamaldehyde (26.37 mg/ml) > cinnamaldehyde (0.209 mg/ml) > eugenol (0.052 mg/ml). CEO, eugenol, cinnamaldehyde and α-methyl cinnamaldehyde, respectively, exhibited two-, four-, four- and eightfold increase of sessile MIC compared to their planktonic MIC. The growth kinetics of both planktonic and sessile Aa in the presence of CEO, eugenol, cinnamaldehyde and α-methyl cinnamaldehyde revealed a complete inhibition at the MICs and 5.3%-37.4% biofilm inhibition at sub-MICs. The time-killing study demonstrated that CEO, eugenol and cinnamaldehyde were capable of reducing the survival rate of both planktonic and sessile Aa cells after 15-20 and 25-30 min, respectively. However, α-methyl cinnamaldehyde showed a superior anti-planktonic to anti-biofilm activity. The daily incorporation of CEO, eugenol and cinnamaldehyde at their MICs for 14 days totally prevented the formation of BETS in the ex vivo model; however, in the case of α-methyl cinnamaldehyde, BETS was visually detectable after 10 days. CONCLUSION CEO and its individual compounds have marked antibacterial activity against Aa. The effective results against planktonic and sessile Aa within reasonable time indicate that they can be used to prevent BETS.
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Affiliation(s)
- W A Lotfy
- Department of Microbiology, Faculty of Dentistry, Pharos University in Alexandria, Alexandria, Egypt.
| | - M A Matar
- Department of Pediatric Dentistry, Faculty of Dentistry, Pharos University in Alexandria, Alexandria, Egypt
| | - B M Alkersh
- Marine Environment Division, Marine Microbiology Laboratory, National Institute of Oceanography and Fisheries, Alexandria, Egypt
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Vietor FI, Nelson TB. An insidious Aggregatibacter actinomycetemcomitans infection of an ascending aortic endovascular graft. IDCases 2023; 33:e01832. [PMID: 37645535 PMCID: PMC10461122 DOI: 10.1016/j.idcr.2023.e01832] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 06/27/2023] [Accepted: 06/27/2023] [Indexed: 08/31/2023] Open
Abstract
While HACEK group organisms cause only 1-3% of infective endocarditis (IE) cases, their insidious and varied clinical presentations make for difficult and often delayed diagnoses. We present a 65-year-old male with persistent exertional dyspnea, hemoptysis, and weight loss who was diagnosed with a HACEK aortic graft infection and IE.
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Affiliation(s)
- Faith I. Vietor
- University of Missouri-Columbia School of Medicine, 1 Hospital Drive, Columbia, MO 65212, USA
| | - Taylor B. Nelson
- Division of Infectious Diseases, University of Missouri, 1 Hospital Drive, Columbia, MO 65212, USA
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Mesturino MA, Bitetti C, Clemente A, Krzysztofiak A, Lancella L, Lombardi R, Cursi L, Boccuzzi E, Musolino AM, Villani A. Aggregatibacter actinomycetemcomitans infection in a 15-year-old boy with pulmonary empyema: a case report and review of literature. Ital J Pediatr 2023; 49:42. [PMID: 37004059 PMCID: PMC10066016 DOI: 10.1186/s13052-023-01429-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/19/2023] [Accepted: 02/10/2023] [Indexed: 04/03/2023] Open
Abstract
BACKGROUND Aggregatibacter actinomycetemcomitans (Aa), previously known as Actinobacillus actinomycetemcomitans, is a slow-growing Gram-negative coccobacillus, member of the HACEK group of bacteria colonizing oral flora. Besides causing infectious diseases in the oral cavity such as dental caries and periodontitis, it is responsible for severe extra-oral infections secondary to hematogenous spread or aspiration, such as endocarditis, soft tissue abscesses and osteomyelitis. The diagnosis depends on prolonged bacterial culture of biological material obtained through biopsy. Aa is susceptible to most antibiotics but complete eradication often requires a long term treatment. CASE PRESENTATION We report the case of a 15-year-old previously healthy boy diagnosed with both pulmonary empyema and subphrenic chest wall abscess caused by Aa. He was admitted to our Pediatric Emergency department for evaluation of a right mass associated with marked asthenia and dry cough. After radiological findings etiological diagnosis was made by culture of fluid drainage of pleural empyema. He started empirical antibiotic therapy with intravenous piperacillin/tazobactam, whose sensibility was confirmed by the antibiogram, then, for occurrance of hepatopathy it was switched to ciprofloxacin: the patient almost completely recovered after 6-month therapy. CONCLUSIONS Extra-oral infections caused by Aa are extremely rare, especially in children, and not well described yet. To our knowledge, there is only another similar case described in literature. However, the case described in our manuscript represents the only one presenting with pulmonary empyema without involvement of lung parenchyma in children. We also conducted a brief review of published cases of Aa infection in the pediatric population. This case report reminds us the importance of an accurate inspection of the oral cavity during the examination of pediatric patients.
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Affiliation(s)
- Maria Alessia Mesturino
- Unit of Emergency Pediatrics, Department of Emergency, Admission and General Pediatrics, Bambino Gesù Children's Hospital (IRCCS), Rome, Italy.
| | - Carol Bitetti
- University Hospital Pediatric Department, Bambino Gesù Children's Hospital (IRCCS), Rome, Italy
| | - Anna Clemente
- Department of Maternal, Infantile, and Urological Sciences, Faculty of Medicine and Dentistry, Sapienza University of Rome, Rome, Italy
| | - Andrzej Krzysztofiak
- Infectious Diseases and Immunoinfectivology Unit, University Hospital Pediatric Department, Bambino Gesù Children's Hospital (IRCCS), Rome, Italy
| | - Laura Lancella
- Infectious Diseases and Immunoinfectivology Unit, University Hospital Pediatric Department, Bambino Gesù Children's Hospital (IRCCS), Rome, Italy
| | - Roberta Lombardi
- Unit of Emergency Radiology, Department of Diagnostic Imaging, Bambino Gesù Children's Hospital (IRCCS), Rome, Italy
| | - Laura Cursi
- Infectious Diseases and Immunoinfectivology Unit, University Hospital Pediatric Department, Bambino Gesù Children's Hospital (IRCCS), Rome, Italy
| | - Elena Boccuzzi
- Unit of Emergency Pediatrics, Department of Emergency, Admission and General Pediatrics, Bambino Gesù Children's Hospital (IRCCS), Rome, Italy
| | - Anna Maria Musolino
- Unit of Emergency Pediatrics, Department of Emergency, Admission and General Pediatrics, Bambino Gesù Children's Hospital (IRCCS), Rome, Italy
| | - Alberto Villani
- Unit of General Pediatrics, Department of Emergency, Admission and General Pediatrics, Bambino Gesù Children's Hospital (IRCCS), Rome, Italy
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Afrasiabi S, Barikani HR, Chiniforush N. Comparison of bacterial disinfection efficacy using blue and red lights on dental implants contaminated with Aggregatibacter actinomycetemcomitans. Photodiagnosis Photodyn Ther 2022; 40:103178. [PMID: 36602065 DOI: 10.1016/j.pdpdt.2022.103178] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 10/26/2022] [Accepted: 10/27/2022] [Indexed: 12/12/2022]
Abstract
OBJECTIVES The purpose of this study was to determine the bacterial disinfection efficacy of four photosensitizers (PSs; curcumin, riboflavin, toluidine blue O, and phycocyanin) with blue diode laser (Blue DL) and blue light-emitting diode (Blue LED) or Red DL and Red LED in dental implants contaminated with Aggregatibacter actinomycetemcomitans. MATERIALS AND METHODS A total of 60 dental implants were contaminated with A. actinomycetemcomitans. All implants were then randomized into ten different disinfection modalities (n = 6 implants per group). The irradiation wavelength in Blue DL and Blue LED or Red DL and Red LED was 450, 430-460, 635, and 630 nm, respectively and its applied energy density was 60 J/cm2 in all groups. Group IX was served as the control group and in group X disinfection was performed with 0.2% chlorhexidine. After the treatments, the colony forming units (CFUs)/ml were calculated to determine antimicrobial effects of each treatment. RESULTS All disinfection methods significantly reduced bacteria amounts of dental implants inoculated with A. actinomycetemcomitans compared to control group. The CFU/ml in LED group was significantly lower than the DL in all studied groups. CONCLUSION aPDT could be an effective supplement in dental implants disinfection. The LED, proved to be better in reducing CFU/ml of A. actinomycetemcomitans on dental implants surface than DL.
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Affiliation(s)
- Shima Afrasiabi
- Laser Research Center of Dentistry, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
| | - Hamid Reza Barikani
- Dental Implant Research Center, Dental Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
| | - Nasim Chiniforush
- Laser Research Center of Dentistry, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran.
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Bapat A, Lucey O, Eckersley M, Ciesielczuk H, Ranasinghe S, Lambourne J. Invasive Aggregatibacter infection: shedding light on a rare pathogen in a retrospective cohort analysis. J Med Microbiol 2022; 71. [PMID: 36748613 DOI: 10.1099/jmm.0.001612] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
Introduction. Aggregatibacter are Gram-negative, facultatively anaerobic rods or coccobacilli that are infrequently encountered as pathogens causing infection.Hypothesis/Gap Statement. The range of invasive infection that Aggregatibacter cause is poorly described. The pathogenicity of species such as Aggregatibacter segnis is debated.Aim. To identify invasive infection due to Aggregatibacter species in a large healthcare organization and to characterize clinical syndromes, co-morbidities and risk factors.Methodology. All microbiological samples positive for Aggregatibacter species were identified by conventional culture or 16S rRNA PCR between October 2017 and March 2021. Electronic records for all patients with positive samples were reviewed and the infection syndrome classified for patients with invasive disease.Results. Twenty-seven patients with invasive infection were identified, with a statistically significant difference in species-specific patterns of invasive infection (P=0.02) and a statistically significant association with residence in the 30 % most deprived households in the UK by postcode (P<0.01). The three most common co-morbidities were periodontitis or recent dental work (29.6%), cardiovascular disease (25.9%) and diabetes (18.5 %).Conclusion. We describe a novel association of Aggregatibacter segnis with skin and soft tissue infection. The propensity of the Aggregatibacter species to cause invasive infection at different body sites and be associated with deprivation is reported. Aggregatibacter actinomycetemcomitans bacteraemia was associated with infective endocarditis, and Aggregatibacter aphrophilus was implicated in severe appendicitis and noted to cause brain abscess. Areas warranting future research include exploring the risk-factors required for invasive infection and those that may determine the species-specific differences in patterns of invasive disease.
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Affiliation(s)
- Anjaneya Bapat
- Centre for Immunobiology, Blizard Institute, Barts and the London School of Medicine and Dentistry, Queen Mary University of London, London, UK.,Division of Infection, Barts Health NHS Trust, London, UK
| | - Olivia Lucey
- Division of Infection, Barts Health NHS Trust, London, UK
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Khaledi M, Sameni F, Afkhami H, Hemmati J, Asareh Zadegan Dezfuli A, Sanae MJ, Validi M. Infective endocarditis by HACEK: a review. J Cardiothorac Surg 2022; 17:185. [PMID: 35986339 PMCID: PMC9389832 DOI: 10.1186/s13019-022-01932-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 08/13/2022] [Indexed: 11/29/2022] Open
Abstract
Infective endocarditis (IE) is a severe disease that is still associated with high mortality despite recent advances in diagnosis and treatment. HACEK organisms (Haemophilus spp., Aggregatibacter actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens, and Kingella kingae) are gram-negative bacteria that are part of the normal flora of the mouth and upper respiratory tract in humans. These organisms cause a wide range of infections, of which IE is one of the most notable. In order to control and prevent endocarditis caused by HACEK, measures such as oral hygiene and the use of prophylactic drugs should be used for people at risk, including people with underlying heart disease and people with artificial valves. This review is a summary of the main aspects of IE focusing on HACEK organisms.
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Benhaïm-Mattout E, Cano A, Di Meglio C, Bosdure E, Chabrol B, Dubus J. A rare chest tumor in a 7-year old girl with a neurodegenerative disease. Respir Med Case Rep 2022; 37:101648. [PMID: 35433248 PMCID: PMC9006848 DOI: 10.1016/j.rmcr.2022.101648] [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: 08/20/2020] [Revised: 01/21/2021] [Accepted: 03/30/2022] [Indexed: 11/29/2022] Open
Abstract
We report the case of a 7-year-old girl with a history of San Filippo disease who presented with gingivitis and painful chest tumefaction. Microbiology of this tumefaction identified Aggregatibacter actinomycetemcomitans (AA), a slowly growing, commensal, Gram negative bacillus that is a very unusual cause of thoracic infection. We discuss this case in the light of available literature of pediatric cases of AA thoracic infection. Conclusion: a tumor-like chest mass in a patient with multiple disabilities should evoke an invasive AA infection.
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Affiliation(s)
- E. Benhaïm-Mattout
- Service de Spécialités Pédiatriques et Médecine Infantile, CHU Timone-Enfants, 13385, Marseille Cedex 5, France
| | - A. Cano
- Service de Spécialités Pédiatriques et Médecine Infantile, CHU Timone-Enfants, 13385, Marseille Cedex 5, France
- Centre de référence des maladies héréditaires du métabolisme, CHU Timone-Enfants, 13385, Marseille Cedex 5, France
| | - C. Di Meglio
- Service de Spécialités Pédiatriques et Médecine Infantile, CHU Timone-Enfants, 13385, Marseille Cedex 5, France
- Centre de référence des maladies héréditaires du métabolisme, CHU Timone-Enfants, 13385, Marseille Cedex 5, France
| | - E. Bosdure
- Service de Spécialités Pédiatriques et Médecine Infantile, CHU Timone-Enfants, 13385, Marseille Cedex 5, France
| | - B. Chabrol
- Service de Spécialités Pédiatriques et Médecine Infantile, CHU Timone-Enfants, 13385, Marseille Cedex 5, France
- Centre de référence des maladies héréditaires du métabolisme, CHU Timone-Enfants, 13385, Marseille Cedex 5, France
| | - J.C. Dubus
- Service de Spécialités Pédiatriques et Médecine Infantile, CHU Timone-Enfants, 13385, Marseille Cedex 5, France
- Aix-Marseille Université, AP-HM, IRD, MEPHI, IHU-Méditerranée Infection, 13005, Marseille, France
- Corresponding author. CHU Timone-Enfants, 264 rue Saint-Pierre, 13385, Marseille Cedex 5, France.
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da Silva GC, Gonçalves OS, Rosa JN, França KC, Bossé JT, Santana MF, Langford PR, Bazzolli DMS. Mobile Genetic Elements Drive Antimicrobial Resistance Gene Spread in Pasteurellaceae Species. Front Microbiol 2022; 12:773284. [PMID: 35069478 PMCID: PMC8777487 DOI: 10.3389/fmicb.2021.773284] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Accepted: 11/10/2021] [Indexed: 11/24/2022] Open
Abstract
Mobile genetic elements (MGEs) and antimicrobial resistance (AMR) drive important ecological relationships in microbial communities and pathogen-host interaction. In this study, we investigated the resistome-associated mobilome in 345 publicly available Pasteurellaceae genomes, a large family of Gram-negative bacteria including major human and animal pathogens. We generated a comprehensive dataset of the mobilome integrated into genomes, including 10,820 insertion sequences, 2,939 prophages, and 43 integrative and conjugative elements. Also, we assessed plasmid sequences of Pasteurellaceae. Our findings greatly expand the diversity of MGEs for the family, including a description of novel elements. We discovered that MGEs are comparable and dispersed across species and that they also co-occur in genomes, contributing to the family’s ecology via gene transfer. In addition, we investigated the impact of these elements in the dissemination and shaping of AMR genes. A total of 55 different AMR genes were mapped to 721 locations in the dataset. MGEs are linked with 77.6% of AMR genes discovered, indicating their important involvement in the acquisition and transmission of such genes. This study provides an uncharted view of the Pasteurellaceae by demonstrating the global distribution of resistance genes linked with MGEs.
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Affiliation(s)
- Giarlã Cunha da Silva
- Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Osiel Silva Gonçalves
- Grupo de Genômica Evolutiva Microbiana, Laboratório de Genética Molecular de Microrganismos, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Jéssica Nogueira Rosa
- Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Kiara Campos França
- Grupo de Genômica Evolutiva Microbiana, Laboratório de Genética Molecular de Microrganismos, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Janine Thérèse Bossé
- Section of Paediatrics, Department of Medicine, Imperial College London, London, United Kingdom
| | - Mateus Ferreira Santana
- Grupo de Genômica Evolutiva Microbiana, Laboratório de Genética Molecular de Microrganismos, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária, Universidade Federal de Viçosa, Viçosa, Brazil
| | - Paul Richard Langford
- Section of Paediatrics, Department of Medicine, Imperial College London, London, United Kingdom
| | - Denise Mara Soares Bazzolli
- Laboratório de Genética Molecular de Bactérias, Departamento de Microbiologia, Instituto de Biotecnologia Aplicada à Agropecuária, Universidade Federal de Viçosa, Viçosa, Brazil
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Yukihira N, Hori H, Yamashita T, Kawamura A, Fukuchi T, Sugawara H. Spontaneous Pyogenic Spondylitis and Possible Infective Endocarditis Caused by Aggregatibacter actinomycetemcomitans. Intern Med 2021; 60:1621-1625. [PMID: 33328398 PMCID: PMC8188020 DOI: 10.2169/internalmedicine.5103-20] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Aggregatibacter actinomycetemcomitans, an etiological agent associated with periodontitis, endocarditis, and other infections, has rarely been implicated in spondylitis. A 70-year-old man with aortic valve replacement presented with a 4-month history of lower back pain and was diagnosed with spondylitis. Prolonged incubation of blood cultures and a biopsy yielded A. actinomycetemcomitans. Concurrent infective endocarditis (IE) was probable considering the infectious organism and the patients' prosthetic valve. The patient was treated with ceftriaxone and recovered well. Pyogenic spondylitis with possible concurrent IE may be caused by A. actinomycetemcomitans. Extended incubation and repeated cultures should be considered if Haemophilus spp., Aggregatibacter spp, Cardiobacterium spp, Eikenella spp, and Kingella spp. (HACEK) infection is suspected.
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Affiliation(s)
- Naoko Yukihira
- Department of Anesthesia, Tokyo Metropolitan Health and Hospital Corporation, Toshima Hospital, Japan
| | - Hiroshi Hori
- Division of General Medicine, Department of Comprehensive Medicine 1, Saitama Medical Center, Jichi Medical University, Japan
| | - Takeshi Yamashita
- Division of General Medicine, Department of Comprehensive Medicine 1, Saitama Medical Center, Jichi Medical University, Japan
| | - Ai Kawamura
- Division of General Medicine, Department of Comprehensive Medicine 1, Saitama Medical Center, Jichi Medical University, Japan
| | - Takahiko Fukuchi
- Division of General Medicine, Department of Comprehensive Medicine 1, Saitama Medical Center, Jichi Medical University, Japan
| | - Hitoshi Sugawara
- Division of General Medicine, Department of Comprehensive Medicine 1, Saitama Medical Center, Jichi Medical University, Japan
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12
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Homsi N, Kapila R. Aggregatibacter actinomycetemcomitans Causing Empyema Necessitans and Pyomyositis in an Immunocompetent Patient. Cureus 2020; 12:e9454. [PMID: 32874788 PMCID: PMC7455391 DOI: 10.7759/cureus.9454] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Empyema necessitans is a relatively rare clinical entity in which the empyema extends through the parietal pleura into the adjacent soft tissue and musculature of the chest wall. It usually occurs due to inadequate treatment of a primary lung infection. Aggregatibacter (formerly Actinobacillus) actinomycetemcomitans is a facultative anaerobic gram-negative coccobacillus that is part of the normal oral flora. Infections due to this organism usually result from aspiration in conjunction with dental disease or trauma to the oral mucosa resulting in pneumonia or empyema. It often coinfects with Actinomyces and is known to cause empyema necessitans. Cases of monomicrobial empyema necessitans due to Aggregatibacter actinomycetemcomitans in adults have rarely been reported with four such publications found on review of the literature. We present a patient with severe periodontitis who developed empyema necessitans due to Aggregatibacter actinomycetemcomitans likely from aspiration complicated by pyomyositis of the right triceps brachii and a left posterior thigh abscess.
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Affiliation(s)
- Nora Homsi
- Infectious Diseases, Rutgers New Jersey Medical School/Trinitas Regional Medical Center, Newark, USA
| | - Rajendra Kapila
- Infectious Diseases, Rutgers New Jersey Medical School/Trinitas Regional Medical Center, Newark, USA
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13
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Martín-Serradilla JI, Franco-Hidalgo S, Sánchez-Barranco F, Laherrán-Rodríguez E, Hernández-Carrero MT. Diaphragmatic mass caused by Aggregatibacter actinomycetemcomitams. IDCases 2020; 21:e00846. [PMID: 32514396 PMCID: PMC7267722 DOI: 10.1016/j.idcr.2020.e00846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Revised: 05/26/2020] [Accepted: 05/26/2020] [Indexed: 11/28/2022] Open
Abstract
actinomycetemcomitans causes periodontitis, endocarditis and soft tissue abscess. First case of A. actinomycetemcomitans diaphragmatic infection without lung injury. Hematogenous spread of A. actinomycetemcomitans from oral mucosa to thorax. Color is not necessary for the figure.
A 52-year-old man was evaluated in our outpatient facility because of a thoracic mass for one month. A needle biopsy of the chest mass was performed and microbiological culture showed growth of Aggregatibacter actinomycetemcomitans. Three months after starting antimicrobial therapy, acute phase reactants normalized, and chest CT showed a progressive reduction in the size of the phlegmon. To our knowledge, we report the first case of A. actinomycetemcomitans diaphragmatic and chest wall infection without pulmonary involvement. This supports the theory of hematogenous spread of the germ from oral mucosa to produce thoracic lesions.
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Affiliation(s)
- Jose I Martín-Serradilla
- Unidad de Diagnóstico Rápido, Servicio de Medicina Interna, Complejo Asistencial Universitario de Palencia, Palencia, Spain
| | - Silvia Franco-Hidalgo
- Unidad de Diagnóstico Rápido, Servicio de Medicina Interna, Complejo Asistencial Universitario de Palencia, Palencia, Spain
| | - Fernando Sánchez-Barranco
- Unidad de Diagnóstico Rápido, Servicio de Medicina Interna, Complejo Asistencial Universitario de Palencia, Palencia, Spain
| | - Elena Laherrán-Rodríguez
- Unidad de Diagnóstico Rápido, Servicio de Medicina Interna, Complejo Asistencial Universitario de Palencia, Palencia, Spain
| | - Maria-Teresa Hernández-Carrero
- Unidad de Diagnóstico Rápido, Servicio de Medicina Interna, Complejo Asistencial Universitario de Palencia, Palencia, Spain
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14
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Akkaoui S, Johansson A, Yagoubi M, Haubek D, El hamidi A, Rida S, Claesson R, Ennibi O. Chemical Composition, Antimicrobial activity, in Vitro Cytotoxicity and Leukotoxin Neutralization of Essential Oil from Origanum vulgare against Aggregatibacter actinomycetemcomitans. Pathogens 2020; 9:pathogens9030192. [PMID: 32151045 PMCID: PMC7157215 DOI: 10.3390/pathogens9030192] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2020] [Revised: 03/02/2020] [Accepted: 03/03/2020] [Indexed: 01/06/2023] Open
Abstract
In this study, the essential oil of Origanum vulgare was evaluated for putative antibacterial activity against six clinical strains and five reference strains of Aggregatibacter actinomycetemcomitans, in comparison with some antimicrobials. The chemical composition of the essential oil was analyzed, using chromatography (CG) and gas chromatography-mass spectrometry coupled (CG-MS). The major compounds in the oil were Carvacrol (32.36%), α-terpineol (16.70%), p-cymene (16.24%), and Thymol (12.05%). The antimicrobial activity was determined by an agar well diffusion test. A broth microdilution method was used to study the minimal inhibitory concentration (MIC). The minimal bactericidal concentration (MBC) was also determined. The cytotoxicity of the essential oil (IC50) was <125 µg/mL for THP-1 cells, which was high in comparison with different MIC values for the A. actinomycetemcomitans strains. O. vulgare essential oil did not interfere with the neutralizing capacity of Psidium guajava against the A. actinomycetemcomitans leukotoxin. In addition, it was shown that the O. vulgare EO had an antibacterial effect against A. actinomycetemcomitans on a similar level as some tested antimicrobials. In view of these findings, we suggest that O.vulgare EO may be used as an adjuvant for prevention and treatment of periodontal diseases associated to A. actinomycetemcomitans. In addition, it can be used together with the previously tested leukotoxin neutralizing Psidium guajava.
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Affiliation(s)
- Sanae Akkaoui
- Research laboratory in oral biology and biotechnology, Faculty of dental medicine, Mohammed V University in Rabat, Rabat 10 000, Morocco;
| | - Anders Johansson
- Division of Molecular Periodontology, Department of Odontology, Umeå University, 901 87 Umeå, Sweden;
| | - Maâmar Yagoubi
- Microbiology Laboratory, faculty of medicine and pharmacy, Mohammed V University in Rabat, Rabat 10 000, Morocco;
| | - Dorte Haubek
- Section for Pediatric Dentistry, Department of Dentistry and Oral Health, AarhusUniversity, 8000 Aarhus, Denmark;
| | - Adnane El hamidi
- Materials, Nanotechnologies and Environment laboratory, Faculty of Sciences, Mohammed V University in Rabat, Rabat 10 000, Morocco;
| | - Sana Rida
- Department of endodontics, Research laboratory in oral biology and biotechnology, Faculty of Dental Medicine, Mohammed V University in Rabat, Rabat 10 000, Morocco;
| | - Rolf Claesson
- Division of Oral Microbiology, Department of Odontology, Umeå University, 901 87 Umeå, Sweden;
| | - OumKeltoum Ennibi
- Department of Periodontology, Research laboratory in oral biology and biotechnology, Faculty of Dental Medicine, Mohammed V University in Rabat, Rabat 10 000, Morocco
- Correspondence:
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15
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Schneider B, Weigel W, Sztukowska M, Demuth DR. Identification and functional characterization of type II toxin/antitoxin systems in Aggregatibacter actinomycetemcomitans. Mol Oral Microbiol 2018; 33:224-233. [PMID: 29319934 PMCID: PMC5969271 DOI: 10.1111/omi.12215] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/05/2018] [Indexed: 11/30/2022]
Abstract
Type II toxin/antitoxin (TA) systems contribute to the formation of persister cells and biofilm formation for many organisms. Aggregatibacter actinomycetemcomitans thrives in the complex oral microbial community subjected to continual environmental flux. Little is known regarding the presence and function of type II TA systems in this organism or their contribution to adaptation and persistence in the biofilm. We identified 11 TA systems that are conserved across all seven serotypes of A. actinomycetemcomitans and represent the RelBE, MazEF and HipAB families of type II TA systems. The systems selectively responded to various environmental conditions that exist in the oral cavity. Two putative RelBE‐like TA systems, D11S_1194‐1195 and D11S_1718‐1719 were induced in response to low pH and deletion of D11S_1718‐1719 significantly reduced metabolic activity of stationary phase A. actinomycetemcomitans cells upon prolonged exposure to acidic conditions. The deletion mutant also exhibited reduced biofilm biomass when cultured under acidic conditions. The D11S_1194 and D11S_1718 toxin proteins inhibited in vitro translation of dihydrofolate reductase (DHFR) and degraded ribosome‐associated, but not free, MS2 virus RNA. In contrast, the corresponding antitoxins (D11S_1195 and D11S_1719), or equimolar mixtures of toxin and antitoxin, had no effect on DHFR production or RNA degradation. Together, these results suggest that D11S_1194‐1195 and D11S_1718‐1719 are RelBE‐like type II TA systems that are activated under acidic conditions and may function to cleave ribosome‐associated mRNA to inhibit translation in A. actinomycetemcomitans. In vivo, these systems may facilitate A. actinomycetemcomitans adaptation and persistence in acidic local environments in the dental biofilm.
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Affiliation(s)
- B Schneider
- Department of Oral Immunology and Infectious Disease, University of Louisville School of Dentistry, Louisville, KY, USA
| | - W Weigel
- Department of Oral Immunology and Infectious Disease, University of Louisville School of Dentistry, Louisville, KY, USA
| | - M Sztukowska
- Department of Oral Immunology and Infectious Disease, University of Louisville School of Dentistry, Louisville, KY, USA
| | - D R Demuth
- Department of Oral Immunology and Infectious Disease, University of Louisville School of Dentistry, Louisville, KY, USA
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16
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Lützen L, Olesen B, Voldstedlund M, Christensen JJ, Moser C, Knudsen JD, Fuursted K, Hartmeyer GN, Chen M, Søndergaard TS, Rosenvinge FS, Dzajic E, Schønheyder HC, Nørskov-Lauritsen N. Incidence of HACEK bacteraemia in Denmark: A 6-year population-based study. Int J Infect Dis 2018; 68:83-87. [PMID: 29408674 DOI: 10.1016/j.ijid.2018.01.025] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2017] [Revised: 01/22/2018] [Accepted: 01/24/2018] [Indexed: 10/18/2022] Open
Abstract
OBJECTIVES Bacteria with common microbiological and clinical characteristics are often recognized as a particular group. The acronym HACEK stands for five fastidious genera associated with infective endocarditis (Haemophilus, Aggregatibacter, Cardiobacterium, Eikenella, and Kingella). Data on the epidemiology of HACEK are sparse. This article reports a 6-year nationwide study of HACEK bacteraemia in Denmark. METHODS Cases of HACEK bacteraemia occurring during the years 2010-2015 were retrieved from the national Danish microbiology database, covering an average surveillance population of 5.6 million per year. RESULTS A total of 147 cases of HACEK bacteraemia were identified, corresponding to an annual incidence of 0.44 per 100000 population. The annual incidence for males was 0.56 per 100000 and for females was 0.31 per 100000. The median age was 56 years (range 0-97 years), with variation among the genera. One hundred and forty-three isolates were identified to the species level and six to the genus level: Haemophilus spp, n=55; Aggregatibacter spp, n=37; Cardiobacterium spp, n=9; Eikenella corrodens n=21; and Kingella spp, n=27. CONCLUSIONS This is the first study on the incidence of HACEK bacteraemia in a large surveillance population and may inspire further studies on the HACEK group. Haemophilus spp other than Haemophilus influenzae accounted for most cases of HACEK bacteraemia in Denmark, with Aggregatibacter spp in second place.
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Affiliation(s)
- Lisbeth Lützen
- Department of Clinical Microbiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, 8200 Aarhus N, Denmark; Department of Clinical Microbiology, Copenhagen University Hospital, Herlev and Gentofte Hospital, Herlev Ringvej 75, 2730 Herlev, Denmark; Department of Clinical Microbiology, Aalborg University Hospital, Hobrovej 18-22, 9100 Aalborg, Denmark.
| | - Bente Olesen
- Department of Clinical Microbiology, Copenhagen University Hospital, Herlev and Gentofte Hospital, Herlev Ringvej 75, 2730 Herlev, Denmark.
| | - Marianne Voldstedlund
- Infectious Disease Preparedness, Statens Serum Institut, Artillerivej 5, 2300 København S, Denmark.
| | - Jens J Christensen
- Department of Clinical Microbiology, Slagelse Hospital, Ingemannsvej 18, 4200 Slagelse, Denmark.
| | - Claus Moser
- Department of Clinical Microbiology, Copenhagen University Hospital, Rigshospitalet, Blegdamsvej 9, 2100 København Ø, Denmark.
| | - Jenny D Knudsen
- Department of Clinical Microbiology, Copenhagen University Hospital, Hvidovre Hospital, Kettegård Alle 30, 2650 Hvidovre, Denmark.
| | - Kurt Fuursted
- Department of Clinical Microbiology and Infection Control, Statens Serum Institut, Artillerivej 5, 2300 København S, Denmark.
| | - Gitte N Hartmeyer
- Department of Clinical Microbiology, Odense University Hospital, Søndre Boulevard 29, 5000 Odense, Denmark.
| | - Ming Chen
- Department of Clinical Microbiology, Hospital of Southern Jutland, Sydvang 1, 6400 Sønderborg, Denmark.
| | - Turid S Søndergaard
- Department of Clinical Microbiology, Hospital of Southern Jutland, Sydvang 1, 6400 Sønderborg, Denmark; Department of Microbiology, Hospitalsenheden Midt-Vest, Viborg/Herning, Heibergs Alle 4, 8800 Viborg, Denmark.
| | - Flemming S Rosenvinge
- Department of Clinical Microbiology, Odense University Hospital, Søndre Boulevard 29, 5000 Odense, Denmark; Department of Clinical Microbiology, Sygehus Lillebælt Vejle Sygehus, Beriderbakken 4, 7100 Vejle, Denmark.
| | - Esad Dzajic
- Department of Clinical Microbiology, Sydvestjysk Sygehus Esbjerg, Finsensgade 35, 6700 Esbjerg, Denmark.
| | - Henrik C Schønheyder
- Department of Clinical Microbiology, Aalborg University Hospital, Hobrovej 18-22, 9100 Aalborg, Denmark; Department of Clinical Medicine, Aalborg University, Fredrik Bajers Vej 5, 9100 Aalborg, Denmark.
| | - Niels Nørskov-Lauritsen
- Department of Clinical Microbiology, Aarhus University Hospital, Palle Juul-Jensens Boulevard 99, 8200 Aarhus N, Denmark.
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17
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Storms I, van den Brand M, Schneeberger P, van 't Hullenaar N. Aggregatibacter actinomycetemcomitans pneumonia with chest and abdominal wall involvement. BMJ Case Rep 2017; 2017:bcr-2016-217377. [PMID: 28432161 DOI: 10.1136/bcr-2016-217377] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
Abstract
A 54-year-old man presented with a productive cough, chest pain, fever and weight loss. Initial analysis revealed a palpable chest wall mass and consolidation in the left lower lobe and pleural abnormalities on imaging. At that point no infectious cause or malignancy was identified. Microbiological analysis of a needle biopsy from a newly developed abdominal wall mass revealed growth of Aggregatibacter actinomycetemcomitans The patient was successfully treated with antibiotic therapy for 1 year. Aggregatibacter actinomycetemcomitans is a Gram-negative coccobacillus and is part of the normal oral flora. It is capable of causing infections in humans including periodontitis, soft tissue abscesses and systemic invasive infections, most commonly endocarditis.
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Affiliation(s)
- Iris Storms
- Canisius Wilhemina Ziekenhuis, Nijmegen, The Netherlands
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18
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Jaffar N, Ishikawa Y, Mizuno K, Okinaga T, Maeda T. Mature Biofilm Degradation by Potential Probiotics: Aggregatibacter actinomycetemcomitans versus Lactobacillus spp. PLoS One 2016; 11:e0159466. [PMID: 27438340 PMCID: PMC4954673 DOI: 10.1371/journal.pone.0159466] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2016] [Accepted: 07/01/2016] [Indexed: 02/07/2023] Open
Abstract
The biofilm degradation of Aggregatibacter actinomycetemcomitans is essential as a complete periodontal disease therapy, and here we show the effects of potential probiotic bacteria such as Lactobacillus spp. for the biofilm of several serotypes of A. actinomycetemcomitans strains. Eight of the 13 species showed the competent biofilm degradation of ≥ 90% reduction in biofilm values in A. actinomycetemcomitans Y4 (serotype b) as well as four of the seven species for the biofilm of A. actinomycetemcomitans OMZ 534 (serotype e). In contrast, the probiotic bacteria did not have a big impact for the degradation of A. actinomycetemcomitans SUNY 75 (serotype a) biofilm. The dispersed A. actinomycetemcomitans Y4 cells through the biofilm detachment were still viable and plausible factors for the biofilm degradation were not due to the lactic acid and low pH conditions. The three enzymes, protease, lipase, and amylase may be responsible for the biofilm degradation; in particular, lipase was the most effective enzyme for the biofilm degradation of A. actinomycetemcomitans Y4 along with the protease activity which should be also important for the other serotypes. Remarkable lipase enzyme activities were detected from some of the potential probiotics and a supporting result using a lipase inhibitor presented corroborating evidence that lipase activity is one of the contributing factors for biofilm degradation outside of the protease which is also another possible factor for the biofilm of the other serotype of A. actinomycetemcomitans strains. On the other hand, the biofilm of A. actinomycetemcomitans SUNY 75 (serotype a) was not powerfully degraded by the lipase enzyme because the lipase inhibitor was slightly functional for only two of potential probiotics.
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Affiliation(s)
- Norzawani Jaffar
- Department of Biological Functions Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Wakamatsu-ku, Kitakyushu, Japan
- Faculty of Health Sciences, Gong Badak Campus, Universiti Sultan Zainal Abidin (UniSZA), Kuala Terengganu, Terengganu Darul Iman, Malaysia
| | - Yuya Ishikawa
- Department of Biological Functions Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Wakamatsu-ku, Kitakyushu, Japan
| | - Kouhei Mizuno
- Department of Materials Science and Chemical Engineering, Kitakyushu National College of Technology, Kitakyushu, Japan
| | - Toshinori Okinaga
- School of Oral Health Sciences, Faculty of Dentistry, Kyushu Dental University, Kitakyushu, Japan
| | - Toshinari Maeda
- Department of Biological Functions Engineering, Graduate School of Life Science and Systems Engineering, Kyushu Institute of Technology, Wakamatsu-ku, Kitakyushu, Japan
- Research Center for Advanced Eco-fitting Technology, Kyushu Institute of Technology, Kitakyushu, Japan
- * E-mail:
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19
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Porto AN, Cortelli SC, Borges AH, Matos FZ, Aquino DR, Miranda TB, Oliveira Costa F, Aranha AF, Cortelli JR. Oral and endotracheal tubes colonization by periodontal bacteria: a case-control ICU study. Eur J Clin Microbiol Infect Dis 2016; 35:343-51. [PMID: 26810057 DOI: 10.1007/s10096-015-2518-3] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2015] [Accepted: 10/30/2015] [Indexed: 10/22/2022]
Abstract
Periodontal infection is a possible risk factor for respiratory disorders; however, no studies have assessed the colonization of periodontal pathogens in endotracheal tubes (ET). This case-control study analyzed whether periodontal pathogens are able to colonize ET of dentate and edentulous patients in intensive care units (ICU) and whether oral and ET periodontal pathogen profiles have any correlation between these patients. We selected 18 dentate and 18 edentulous patients from 78 eligible ICU patients. Oral clinical examination including probing depth, clinical attachment level, gingival index , and plaque index was performed by a single examiner, followed by oral and ET sampling and processing by quantitative polymerase chain reaction (total bacterial load, Aggregatibacter actinomycetemcomitans, Porphyromonas gingivalis, and Tannerella forsythia). Data were statistically analyzed by Mann-Whitney U, two-way analysis of variance (p < 0.05). Among dentate, there was no correlation between clinical parameters and ET bacterial levels. Both dentate and edentulous patients showed similar ET bacterial levels. Dentate patients showed no correlation between oral and ET bacterial levels, while edentulous patients showed positive correlations between oral and ET levels of A. actinomycetemcomitans, P. gingivalis, and T. forsythia. Periodontal pathogens can colonize ET and the oral cavity of ICU patients. Periodontal pathogen profiles tend to be similar between dentate and edentulous ICU patients. In ICU patients, oral cavity represents a source of ET contamination. Although accompanied by higher oral bacterial levels, teeth do not seem to influence ET bacterial profiles.
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Affiliation(s)
- A N Porto
- Dental School, University of Cuiaba, Avenida Beira Rio, Cuiabá, Mato Grosso, 78000, Brazil.
| | - S C Cortelli
- Nucleus of Periodontal Research, Dental School, University of Taubate, São Paulo, Brazil
| | - A H Borges
- Dental School, University of Cuiaba, Avenida Beira Rio, Cuiabá, Mato Grosso, 78000, Brazil
| | - F Z Matos
- Dental School, University of Cuiaba, Avenida Beira Rio, Cuiabá, Mato Grosso, 78000, Brazil
| | - D R Aquino
- Nucleus of Periodontal Research, Dental School, University of Taubate, São Paulo, Brazil
| | - T B Miranda
- Nucleus of Periodontal Research, Dental School, University of Taubate, São Paulo, Brazil
| | - F Oliveira Costa
- Periodontal Department, Dental School, Federal University of Minas Gerais, Belo Horizonte, Brazil
| | - A F Aranha
- Dental School, University of Cuiaba, Avenida Beira Rio, Cuiabá, Mato Grosso, 78000, Brazil
| | - J R Cortelli
- Nucleus of Periodontal Research, Dental School, University of Taubate, São Paulo, Brazil
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20
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Lin PY, Chang CD, Chen YC, Shih WL. RhoA/ROCK1 regulates Avian Reovirus S1133-induced switch from autophagy to apoptosis. BMC Vet Res 2015; 11:103. [PMID: 25944062 PMCID: PMC4430033 DOI: 10.1186/s12917-015-0417-6] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2014] [Accepted: 04/26/2015] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Autophagy is an essential process in the control of cellular homeostasis. It enables cells under certain stress conditions to survive by removing toxic cellular components, and may protect cells from apoptosis. In the present study, the signaling pathways involved in ARV S1133 regulated switch from autophagy to apoptosis were investigated. RESULTS ARV S1133 infection caused autophagy in the early to middle infectious stages in Vero and DF1 cells, and apoptosis in the middle to late stages. Conversion of the autophagy marker LC3-I to LC3-II occurred earlier than cleavage of the apoptotic marker caspase-3. ARV S1133 also activated the Beclin-1 promoter in the early to middle stages of infection. Levels of RhoA-GTP and ROCK1 activity were elevated upon ARV S1133 infection, while inhibition of RhoA and ROCK1 reduced autophagy and subsequent apoptosis. Conversely, inhibition of caspase-3 did not affect the level of autophagy. Beclin-1 knockdown and treatment with autophagy inhibitors, 3-MA and Bafilomycin A1, suppressed ARV S1133-induced autophagy and apoptosis simultaneously, suggesting the shift from autophagy to apoptosis. A co-immunoprecipitation assay demonstrated that the formation of a RhoA, ROCK1 and Beclin-1 complex coincided with the induction of autophagy. CONCLUSION Our results demonstrate that RhoA/ROCK1 signaling play critical roles in the transition of cell activity from autophagy to apoptosis in ARV S1133-infected cells.
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Affiliation(s)
- Ping-Yuan Lin
- Department of Biological Science and Technology, Pingtung, 91201, Taiwan.
| | - Ching-Dong Chang
- Veterinary Medicine, National Pingtung University of Science and Technology, Pingtung, Taiwan.
| | - Yo-Chia Chen
- Department of Biological Science and Technology, Pingtung, 91201, Taiwan.
| | - Wen-Ling Shih
- Department of Biological Science and Technology, Pingtung, 91201, Taiwan. .,Graduate Institute of Biotechnology, National Pingtung University of Science and Technology, 1, Shuefu Rd., Neipu, Pingtung, 91201, Taiwan.
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21
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22
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Nash CB, Hendrickson BA, Alexander KA. Pneumonia With Chest Wall Invasion in a School-Aged Child. J Pediatric Infect Dis Soc 2014; 3:e42-4. [PMID: 26625462 DOI: 10.1093/jpids/piu002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Accepted: 12/05/2013] [Indexed: 11/12/2022]
Affiliation(s)
- Colleen B Nash
- Section of Infectious Diseases, Department of Pediatrics, Pritzker School of Medicine, University of Chicago, Illinois
| | - Barbara A Hendrickson
- Section of Infectious Diseases, Department of Pediatrics, Pritzker School of Medicine, University of Chicago, Illinois
| | - Kenneth A Alexander
- Section of Infectious Diseases, Department of Pediatrics, Pritzker School of Medicine, University of Chicago, Illinois
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23
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Ksiazek M, Mizgalska D, Enghild JJ, Scavenius C, Thogersen IB, Potempa J. Miropin, a novel bacterial serpin from the periodontopathogen Tannerella forsythia, inhibits a broad range of proteases by using different peptide bonds within the reactive center loop. J Biol Chem 2014; 290:658-70. [PMID: 25389290 DOI: 10.1074/jbc.m114.601716] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
All prokaryotic genes encoding putative serpins identified to date are found in environmental and commensal microorganisms, and only very few prokaryotic serpins have been investigated from a mechanistic standpoint. Herein, we characterized a novel serpin (miropin) from the human pathogen Tannerella forsythia, a bacterium implicated in initiation and progression of human periodontitis. In contrast to other serpins, miropin efficiently inhibited a broad range of proteases (neutrophil and pancreatic elastases, cathepsin G, subtilisin, and trypsin) with a stoichiometry of inhibition of around 3 and second-order association rate constants that ranged from 2.7 × 10(4) (cathepsin G) to 7.1 × 10(5) m(-1)s(-1) (subtilisin). Inhibition was associated with the formation of complexes that were stable during SDS-PAGE. The unusually broad specificity of miropin for target proteases is achieved through different active sites within the reactive center loop upstream of the P1-P1' site, which was predicted from an alignment of the primary structure of miropin with those of well studied human and prokaryotic serpins. Thus, miropin is unique among inhibitory serpins, and it has apparently evolved the ability to inhibit a multitude of proteases at the expense of a high stoichiometry of inhibition and a low association rate constant. These characteristics suggest that miropin arose as an adaptation to the highly proteolytic environment of subgingival plaque, which is exposed continually to an array of host proteases in the inflammatory exudate. In such an environment, miropin may function as an important virulence factor by protecting bacterium from the destructive activity of neutrophil serine proteases. Alternatively, it may act as a housekeeping protein that regulates the activity of endogenous T. forsythia serine proteases.
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Affiliation(s)
- Miroslaw Ksiazek
- From the Department of Microbiology, Faculty of Biochemistry, Biophysics, and Biotechnology, Jagiellonian University, 30-387 Krakow, Poland,
| | - Danuta Mizgalska
- From the Department of Microbiology, Faculty of Biochemistry, Biophysics, and Biotechnology, Jagiellonian University, 30-387 Krakow, Poland
| | - Jan J Enghild
- Center for Insoluble Protein Structures (inSPIN) and Interdisciplinary Nanoscience Center (iNANO) at the Department of Molecular Biology and Genetics, Aarhus University, Aarhus DK-8000, Denmark, and
| | - Carsten Scavenius
- Center for Insoluble Protein Structures (inSPIN) and Interdisciplinary Nanoscience Center (iNANO) at the Department of Molecular Biology and Genetics, Aarhus University, Aarhus DK-8000, Denmark, and
| | - Ida B Thogersen
- Center for Insoluble Protein Structures (inSPIN) and Interdisciplinary Nanoscience Center (iNANO) at the Department of Molecular Biology and Genetics, Aarhus University, Aarhus DK-8000, Denmark, and
| | - Jan Potempa
- From the Department of Microbiology, Faculty of Biochemistry, Biophysics, and Biotechnology, Jagiellonian University, 30-387 Krakow, Poland, Department of Oral Immunology and Infectious Diseases, University of Louisville School of Dentistry, Louisville, Kentucky 40202
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Juárez-Rodríguez MD, Torres-Escobar A, Demuth DR. Transcriptional regulation of the Aggregatibacter actinomycetemcomitans ygiW-qseBC operon by QseB and integration host factor proteins. MICROBIOLOGY-SGM 2014; 160:2583-2594. [PMID: 25223341 DOI: 10.1099/mic.0.083501-0] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
The QseBC two-component system plays a pivotal role in regulating virulence and biofilm growth of the oral pathogen Aggregatibacter actinomycetemcomitans. We previously showed that QseBC autoregulates the ygiW-qseBC operon. In this study, we characterized the promoter that drives ygiW-qseBC expression. Using lacZ transcriptional fusion constructs and 5'-rapid amplification of cDNA ends, we showed that ygiW-qseBC expression is driven by a promoter that initiates transcription 53 bases upstream of ygiW and identified putative cis-acting promoter elements, whose function was confirmed using site-specific mutagenesis. Using electrophoretic mobility shift assays, two trans-acting proteins were shown to interact with the ygiW-qseBC promoter. The QseB response regulator bound to probes containing the direct repeat sequence CTTAA-N6-CTTAA, where the CTTAA repeats flank the -35 element of the promoter. The ygiW-qseBC expression could not be detected in A. actinomycetemcomitans ΔqseB or ΔqseBC strains, but was restored to WT levels in the ΔqseBC mutant when complemented by single copy chromosomal insertion of qseBC. Interestingly, qseB partially complemented the ΔqseBC strain, suggesting that QseB could be activated in the absence of QseC. QseB activation required its phosphorylation since complementation did not occur using qseB(pho-), encoding a protein with the active site aspartate substituted with alanine. These results suggest that QseB is a strong positive regulator of ygiW-qseBC expression. In addition, integration host factor (IHF) bound to two sites in the promoter region and an additional site near the 5' end of the ygiW ORF. The expression of ygiW-qseBC was increased by twofold in ΔihfA and ΔihfB strains of A. actinomycetemcomitans, suggesting that IHF is a negative regulator of the ygiW-qseBC operon.
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Affiliation(s)
- María Dolores Juárez-Rodríguez
- Research Group in Oral Health and Systemic Disease, University of Louisville School of Dentistry, 501 S. Preston Street, Louisville, KY 40202, USA
| | - Ascención Torres-Escobar
- Research Group in Oral Health and Systemic Disease, University of Louisville School of Dentistry, 501 S. Preston Street, Louisville, KY 40202, USA
| | - Donald R Demuth
- Research Group in Oral Health and Systemic Disease, University of Louisville School of Dentistry, 501 S. Preston Street, Louisville, KY 40202, USA
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Matzumura-Kuan M, Jennings J. Aggregatibacter actinomycetemcomitans infection mimicking lung cancer: A case report. ACTA ACUST UNITED AC 2014; 46:669-72. [DOI: 10.3109/00365548.2014.920104] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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26
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Sen Yew H, Chambers ST, Roberts SA, Holland DJ, Julian KA, Raymond NJ, Beardsley J, Read KM, Murdoch DR. Association between HACEK bacteraemia and endocarditis. J Med Microbiol 2014; 63:892-895. [PMID: 24681996 DOI: 10.1099/jmm.0.070060-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
We retrospectively examined medical records of 87 patients with bacteraemia caused by members of the HACEK group (Haemophilus parainfluenzae, Aggregatibacter actinomycetemcomitans, Aggregatibacter aphrophilus, Aggregatibacter paraphrophilus, Cardiobacterium spp., Eikenella corrodens and Kingella spp.) to determine whether endocarditis was present, as defined by the Duke criteria. The overall positive predictive value (PPV) of HACEK bacteraemia for endocarditis was 60 %. The PPV varied with different HACEK species from 0 % (E. corrodens) to 100 % (A. actinomycetemcomitans).
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Affiliation(s)
- Haur Sen Yew
- Christchurch Hospital, Christchurch, New Zealand
| | - Stephen T Chambers
- University of Otago, Christchurch, New Zealand.,Christchurch Hospital, Christchurch, New Zealand
| | | | | | | | | | | | | | - David R Murdoch
- University of Otago, Christchurch, New Zealand.,Christchurch Hospital, Christchurch, New Zealand
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27
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Pradeep AR, Singh SP, Martande SS, Naik SB, N P, Kalra N, Suke DK. Clinical and microbiological effects of levofloxacin in the treatment of chronic periodontitis: a randomized, placebo-controlled clinical trial. ACTA ACUST UNITED AC 2014; 6:170-8. [DOI: 10.1111/jicd.12091] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Accepted: 11/24/2013] [Indexed: 11/30/2022]
Affiliation(s)
- Avani R. Pradeep
- Department of Periodontics; Government Dental College and Research Institute; Bangalore Karnataka India
| | - Sonender P. Singh
- Department of Periodontics; Government Dental College and Research Institute; Bangalore Karnataka India
| | - Santosh S. Martande
- Department of Periodontics; Government Dental College and Research Institute; Bangalore Karnataka India
| | - Savitha B. Naik
- Department of Conservative Dentistry and Endodontics; Government Dental College and Research Institute; Bangalore Karnataka India
| | - Priyanka N
- Department of Conservative Dentistry and Endodontics; Government Dental College and Research Institute; Bangalore Karnataka India
| | - Nitish Kalra
- Department of Periodontics; Government Dental College and Research Institute; Bangalore Karnataka India
| | - Deepak K. Suke
- Department of Periodontics; Government Dental College and Research Institute; Bangalore Karnataka India
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Oil Essential Mouthwashes Antibacterial Activity against Aggregatibacter actinomycetemcomitans: A Comparison between Antibiofilm and Antiplanktonic Effects. Int J Dent 2013. [PMID: 23762059 DOI: 10.1155/2013/164267]] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
The aim of this work is to determine the antibacterial activity of three marketed mouthwashes on suspended and sessile states of Aggregatibacter actinomycetemcomitans. The efficacy of two commonly used products in clinical practice, containing essential oils as active ingredients (menthol, thymol, methyl salicylate, and eucalyptol) in association with or without alcohol, has been evaluated in comparison with a chlorhexidine-based mouthwash. The microtiter plate assay, in order to obtain a spectrophotometric measurement of bacterial responses at growing dilutions of each antiseptic, was used for the study. The analysis revealed that a good antibacterial activity is reached when the abovementioned mouthwashes were used at concentration over a 1/24 dilution and after an exposure time of 30 seconds at least. In conclusion, the alcoholic mouthwash appears to have a better biofilm inhibition than its antiplanktonic activity while the nonalcoholic product demonstrates an opposite effect with a better antiplanktonic behavior.
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30
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Oil Essential Mouthwashes Antibacterial Activity against Aggregatibacter actinomycetemcomitans: A Comparison between Antibiofilm and Antiplanktonic Effects. Int J Dent 2013; 2013:164267. [PMID: 23762059 PMCID: PMC3671517 DOI: 10.1155/2013/164267] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Accepted: 05/07/2013] [Indexed: 11/17/2022] Open
Abstract
The aim of this work is to determine the antibacterial activity of three marketed mouthwashes on suspended and sessile states of Aggregatibacter actinomycetemcomitans. The efficacy of two commonly used products in clinical practice, containing essential oils as active ingredients (menthol, thymol, methyl salicylate, and eucalyptol) in association with or without alcohol, has been evaluated in comparison with a chlorhexidine-based mouthwash. The microtiter plate assay, in order to obtain a spectrophotometric measurement of bacterial responses at growing dilutions of each antiseptic, was used for the study. The analysis revealed that a good antibacterial activity is reached when the abovementioned mouthwashes were used at concentration over a 1/24 dilution and after an exposure time of 30 seconds at least. In conclusion, the alcoholic mouthwash appears to have a better biofilm inhibition than its antiplanktonic activity while the nonalcoholic product demonstrates an opposite effect with a better antiplanktonic behavior.
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Abstract
A 61-year-old patient with diabetes had a bio-prosthetic aortic valve replacement 3 years before admission. He complained of lethargy, night sweats, decreased appetite and erratic blood glucose with no weight loss. He had splinter haemorrhage and a systolic ejection murmur at the aortic area. Chest and abdominal examination revealed no abnormality. The erythrocyte sedimentation rate and C reactive protein were raised. He had several sets of blood cultures and he was started on empirical vancomycin, rifampicin and gentamicin. Transthoracic echocardiography showed vegetation on the base of the anterior mitral leaflet, which was confirmed by a trans-oesophageal echocardiography. Blood culture was positive for Haemophilus aphrophilus, and he was started on ceftriaxone for 6 weeks instead of vancomycin and rifampicin and continued gentamicin for 2 weeks. Follow-up echocardiography showed no evidence of vegetations. The patient recovered completely and he was discharged home.
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Affiliation(s)
- Nancy Wassef
- Department of Cardiology, Kettering General Hospital, Kettering, UK.
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32
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Oettinger-Barak O, Dashper SG, Catmull DV, Adams GG, Sela MN, Machtei EE, Reynolds EC. Antibiotic susceptibility of Aggregatibacter actinomycetemcomitans JP2 in a biofilm. J Oral Microbiol 2013; 5:20320. [PMID: 23671757 PMCID: PMC3650220 DOI: 10.3402/jom.v5i0.20320] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2012] [Revised: 03/13/2013] [Accepted: 03/18/2013] [Indexed: 11/14/2022] Open
Abstract
BACKGROUND Localized aggressive periodontitis (LAgP) is an inflammatory disease associated with specific bacteria, particularly Aggregatibacter actinomycetemcomitans, which can result in early tooth loss. The bacteria grow as a biofilm known as subgingival plaque. Treatment includes mechanical debridement of the biofilm, often associated with empirical antibiotic treatment. OBJECTIVE The aims of this study were to test in vitro the sensitivity of A. actinomycetemcomitans JP2 during planktonic and biofilm growth to doxycycline and to the combination of metronidazole and amoxicillin, which are two antibiotic protocols commonly used in clinical practice. DESIGN Two in vitro biofilm models were used to test the effects of the antibiotics: a static 96-well plate assay was used to investigate the effect of these antibiotics on biofilm formation whilst a flow chamber model was used to examine the effect on established biofilms. RESULTS Of the antibiotics tested in this model system, doxycycline was most efficacious with a minimal inhibitory concentration (MIC) against planktonic cells of 0.21 mg/L and minimal biofilm inhibitory concentration (MBIC) of 2.10 mg/L. The most commonly prescribed antibiotic regimen, amoxicillin + metronidazole, was much less effective against both planktonic and biofilm cells with an MIC and MBIC of 12.0 mg/L and 20.2 mg/L, respectively. A single treatment of the clinically achievable concentration of 10 mg/L doxycycline to sparse A. actinomycetemcomitans biofilms in the flow chamber model resulted in significant decreases in biofilm thickness, biovolume, and cell viability. Dense A. actinomycetemcomitans biofilms were significantly more resistant to doxycycline treatment. Low concentrations of antibiotics enhanced biofilm formation. CONCLUSION A. actinomycetemcomitans JP2 homotypic biofilms were more susceptible in vitro to doxycycline than amoxicillin + metronidazole.
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Affiliation(s)
- Orit Oettinger-Barak
- Melbourne Dental School, Oral Health CRC, Bio21 Institute, University of Melbourne, Parkville, VIC, Australia
| | - Stuart G. Dashper
- Melbourne Dental School, Oral Health CRC, Bio21 Institute, University of Melbourne, Parkville, VIC, Australia
| | - Deanne V. Catmull
- Melbourne Dental School, Oral Health CRC, Bio21 Institute, University of Melbourne, Parkville, VIC, Australia
| | - Geoffrey G. Adams
- Melbourne Dental School, Oral Health CRC, Bio21 Institute, University of Melbourne, Parkville, VIC, Australia
| | - Michael N. Sela
- Betty and Walter Cohen Chair for Periodontal Research, The Faculty of Dental Medicine, The Hebrew University, Jerusalem, Israel
| | - Eli E. Machtei
- Department of Periodontology, School of Graduate Dentistry, Rambam Health Care Campus, Haifa, Israel
- School of Dental Medicine, Harvard Medical Center, Boston, MA, USA
| | - Eric C. Reynolds
- Melbourne Dental School, Oral Health CRC, Bio21 Institute, University of Melbourne, Parkville, VIC, Australia
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Juárez-Rodríguez MD, Torres-Escobar A, Demuth DR. ygiW and qseBC are co-expressed in Aggregatibacter actinomycetemcomitans and regulate biofilm growth. MICROBIOLOGY-SGM 2013; 159:989-1001. [PMID: 23519160 DOI: 10.1099/mic.0.066183-0] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The quorum-sensing Escherichia coli regulators B and C (QseBC) two-component system were previously shown to regulate biofilm growth of the oral pathogen Aggregatibacter actinomycetemcomitans and to be essential for virulence. In this study, we use RT-PCR to show that an open reading frame, ygiW, residing upstream of qseBC and encoding a hypothetical protein is co-expressed with qseBC. In addition, using a series of lacZ transcriptional fusion constructs and 5'-rapid amplification of cDNA Ends (RACE), the promoter that drives expression of the ygiW-qseBC operon and the transcriptional start site was mapped to the 372 bp intergenic region upstream from ygiW. No internal promoters drive qseBC expression independently from ygiW. However, qseBC expression is attenuated by approximately ninefold by a putative attenuator stem-loop (ΔG = -77.0 KJ/mol) that resides in the 137 bp intergenic region between ygiW and qseB. The QseB response regulator activates expression of the ygiW-qseBC operon and transcription from the ygiW promoter is drastically reduced in ΔqseB and ΔqseBC mutants of A. actinomycetemcomitans. In addition, transcriptional activity of the ygiW promoter is significantly reduced in a mutant expressing an in-frame deletion of qseC that lacks the sensor domain of QseC, suggesting that a periplasmic signal is required for QseB activation. Finally, a non-polar in-frame deletion in ygiW had little effect on biofilm depth but caused a significant increase in surface coverage relative to wild-type. Complementation of the mutant with a plasmid-borne copy of ygiW reduced surface coverage back to wild-type levels. Interestingly, deletion of the sensor domain of QseC or of the entire qseC open reading frame resulted in significant reductions in biofilm depth, biomass and surface coverage, indicating that the sensor domain is essential for optimal biofilm formation by A. actinomycetemcomitans. Thus, although ygiW and qseBC are co-expressed, they regulate biofilm growth by distinct mechanisms.
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Affiliation(s)
- María Dolores Juárez-Rodríguez
- Research Group in Oral Health and Systemic Disease, University of Louisville School of Dentistry, 501 S. Preston Street, Louisville, KY 40202, USA
| | - Ascención Torres-Escobar
- Research Group in Oral Health and Systemic Disease, University of Louisville School of Dentistry, 501 S. Preston Street, Louisville, KY 40202, USA
| | - Donald R Demuth
- Research Group in Oral Health and Systemic Disease, University of Louisville School of Dentistry, 501 S. Preston Street, Louisville, KY 40202, USA
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Juárez-Rodríguez MD, Torres-Escobar A, Demuth DR. Construction of new cloning, lacZ reporter and scarless-markerless suicide vectors for genetic studies in Aggregatibacter actinomycetemcomitans. Plasmid 2013; 69:211-22. [PMID: 23353051 DOI: 10.1016/j.plasmid.2013.01.002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2012] [Revised: 01/07/2013] [Accepted: 01/09/2013] [Indexed: 12/28/2022]
Abstract
To elucidate the putative function of a gene, effective tools are required for genetic characterization that facilitate its inactivation, deletion or modification on the bacterial chromosome. In the present study, the nucleotide sequence of the Escherichia coli/Aggregatibacter actinomycetemcomitans shuttle vector pYGK was determined, allowing us to redesign and construct a new shuttle cloning vector, pJT4, and promoterless lacZ transcriptional/translational fusion plasmids, pJT3 and pJT5. Plasmids pJT4 and pJT5 contain the origin of replication necessary to maintain shuttle vector replication. In addition, a new suicide vector, pJT1, was constructed for the generation of scarless and markerless deletion mutations of genes in the oral pathogen A. actinomycetemcomitans. Plasmid pJT1 is a pUC-based suicide vector that is counter-selectable for sucrose sensitivity. This vector does not leave antibiotic markers or scars on the chromosome after gene deletion and thus provides the option to combine several mutations in the same genetic background. The effectiveness of pJT1 was demonstrated by the construction of A. actinomycetemcomitans isogenic qseB single deletion (ΔqseB) mutant and lsrRK double deletion mutants (ΔlsrRK). These new vectors may offer alternatives for genetic studies in A. actinomycetemcomitans and other members of the HACEK (Haemophilus spp., A. actinomycetemcomitans, Cardiobacterium hominis, Eikenella corrodens, and Kingella kingae) group of Gram-negative bacteria.
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Affiliation(s)
- María Dolores Juárez-Rodríguez
- Research Group in Oral Health and Systemic Disease, University of Louisville School of Dentistry, 501 S. Preston Street, Louisville, KY 40202, USA
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