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Hashai K, Abadi F, Clyman D, Shany-Kdoshim S, Polak D. Macrophages polarize to the pro-inflammatory phenotype and delay neutrophil efferocytosis to augment Aggregatibacter actinomycetemcomitance JP2 clearance. J Periodontal Res 2023; 58:997-1005. [PMID: 37448100 DOI: 10.1111/jre.13160] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2022] [Revised: 06/22/2023] [Accepted: 06/30/2023] [Indexed: 07/15/2023]
Abstract
OBJECTIVE The study examines how neutrophils cross-talk with macrophages during JP2 Aggregatibacter actinomycetemcomitance infection and factors that are involved in inflammatory resolution and efferocytosis. BACKGROUND Although sub-gingival bacteria constitute the primary initiating factor in the pathogenesis of molar-incisor pattern periodontitis (MIPP), the non-resolved host response has a major role in tissue destruction. While evidence links neutrophils to MIPP pathogenesis, their clearance during inflammatory resolution, governed by macrophages, is poorly understood. METHODS Human neutrophils (differentiated from HL60 cells) and macrophages (differentiated from THP1 cells) were inoculated with JP2. The supernatants were collected and exposed to naïve neutrophils or macrophages with or without exposure to JP2. Reactive oxygen species (ROS) were measured with 2'-7'-dichlorofluorescein-diacetate and a fluorescent plate reader. Immunofluorescence labeling of CD47 and cell vitality were examined using flow cytometry. Macrophage polarization was tested by immunofluorescence staining for CD163 and CD68 and a fluorescent microscope, and TNFα and IL-10 secretion was tested using ELISA and RT-PCR. Efferocytosis was examined by pHrodo and carboxyfluorescein succinimidyl ester staining and fluorescent microscopy. In vivo, macrophages were depleted from C57Bl/6 mice and neutrophil CD47 levels were tested using the subcutaneous chamber model. RESULTS Neutrophils exposed to macrophage supernatant show increased ROS, mainly extracellularly, that increased during JP2 infection. Macrophages showed pro-inflammatory M1 phenotype polarization during JP2 infection, and their supernatants prolonged neutrophil survival by inhibiting CD47 down-expression and reducing neutrophil necrosis and apoptosis. Also, the macrophages delay neutrophil efferocytosis during JP2 infection which, in turn, enhanced JP2 clearance. Depletion of macrophages in mice mildly prevented neutrophils CD47 reduction and reduced JP2 clearance. The JP2 infection in mice also led to macrophage M1 polarization similar to the in vitro results. CONCLUSIONS As shown in this study, neutrophil efferocytosis potentially may be reduced during JP2 infection, promoting JP2 clearance, which may contribute to the inflammatory-mediated periodontal tissue damage.
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Affiliation(s)
- Koren Hashai
- Faculty of Dental Medicine, The Hebrew University, Jerusalem, Israel
- Department of Periodontology, Hadassah Medical Center, Jerusalem, Israel
| | - Fairuz Abadi
- Faculty of Dental Medicine, The Hebrew University, Jerusalem, Israel
- Department of Periodontology, Hadassah Medical Center, Jerusalem, Israel
| | - Dana Clyman
- Faculty of Dental Medicine, The Hebrew University, Jerusalem, Israel
- Department of Periodontology, Hadassah Medical Center, Jerusalem, Israel
| | - Sahron Shany-Kdoshim
- Faculty of Dental Medicine, The Hebrew University, Jerusalem, Israel
- Department of Periodontology, Hadassah Medical Center, Jerusalem, Israel
| | - David Polak
- Faculty of Dental Medicine, The Hebrew University, Jerusalem, Israel
- Department of Periodontology, Hadassah Medical Center, Jerusalem, Israel
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Hashai K, Chapple IL, Shapira L, Assadi W, Dadon S, Polak D. CD18 Mediates Neutrophil Imperviousness to the Aggregatibacter actinomycetemcomitans JP2 Clone in Molar-Incisor Pattern Periodontitis. Front Immunol 2022; 13:847372. [PMID: 35663998 PMCID: PMC9159298 DOI: 10.3389/fimmu.2022.847372] [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] [Subscribe] [Scholar Register] [Received: 01/02/2022] [Accepted: 04/04/2022] [Indexed: 11/23/2022] Open
Abstract
Introduction Molar-incisor pattern periodontitis (MIPP) in the absence of significant local risk factors or systemic disease, is a rare, early onset periodontal disease phenotype, with 0.5% to 2.5% global prevalence. The condition is characterized by impaired neutrophil function and persistent Aggregatibacter actinomycetemcomitans (JP2 clone) infection. The aim of this study was to characterize neutrophil functional responses to JP2 and to investigate the neutrophil receptors involved. Materials and Methods Neutrophils were obtained from whole blood samples of periodontally healthy and MIPP subjects and incubated with the JP2 clone or a non-JP2 clone of A. actinomycetemcomitans. Bacterial survival was tested by blood agar culture; neutrophil death was tested with propidium iodide and flow cytometry; Reactive oxygen production (ROS) was measured with 2',7'-dichlorofluorescein diacetate and a fluorescence plate reader; the cytokinome was analysed using an array profiler, ELISA and RT-PCR. Receptors binding to JP2 were isolated using a novel immunoprecipitation assay and validated functionally using specific blocking antibodies. Results JP2 and non-JP2 survival was comparable between all the neutrophil groups. Resistance to neutrophil necrosis following exposure to JP2 was significantly lower in the MIPP group, than in all the other groups (p<0.0001). Conversely, MIPP neutrophils showed lower levels of ROS production in response to JP2 infection compared with that of healthy neutrophils (p<0.001). Furthermore, significantly lower levels of cytokines, such as IL8, IL10 and TNFα, were observed during JP2 incubation with MIPP neutrophils than upon incubation with periodontally healthy neutrophils. Various proteins expressed on neutrophils bind to JP2. Of these, CD18 was found to mediate neutrophil necrosis. The CD18 receptor on MIPP neutrophils acts differently from that on periodontally healthy patients neutrophils, and appears to reflect differential neutrophil reactions to JP2. Conclusion This study portrays a fundamental difference in neutrophil response to JP2 infection between periodontally healthy and MIPP patients. This was evident in the resistance to necrosis, and lower ROS and cytokine production, despite the persistent presence of viable JP2. Whilst in periodontally healthy neutrophils, JP2 binds to CD18 on cell surfaces, this is not the case in MIPP neutrophils, suggesting a potential role for CD18 in the periodontal susceptibility of MIPP patients.
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Affiliation(s)
- Koren Hashai
- Faculty of Dental Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
- Department of Periodontics, Hadassah Medical Center, Jerusalem, Israel
| | - Ian L. Chapple
- Institute of Clinical Sciences, College of Medical and Dental Sciences, School of Dentistry, University of Birmingham, Birmingham, United Kingdom
- Birmingham Community Healthcare National Health Service (NHS) Foundation Trust, Birmingham, United Kingdom
| | - Lior Shapira
- Faculty of Dental Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
- Department of Periodontics, Hadassah Medical Center, Jerusalem, Israel
| | - Walaa Assadi
- Department of Orthodontics, Rambam Medical Center, Haifa, Israel
| | - Stav Dadon
- Faculty of Dental Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
- Department of Orthodontics, Hadassah Medical Center, Jerusalem, Israel
| | - David Polak
- Faculty of Dental Medicine, Hebrew University of Jerusalem, Jerusalem, Israel
- Department of Periodontics, Hadassah Medical Center, Jerusalem, Israel
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Virulence traits and plasmid-mediated quinolone resistance among Aggregatibacter actinomycetemcomitans from Iraq: Low rate of highly virulent JP2 genotype. Microb Pathog 2022; 164:105438. [DOI: 10.1016/j.micpath.2022.105438] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 02/03/2022] [Accepted: 02/04/2022] [Indexed: 11/24/2022]
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Prevalence of the JP2 genotype of Aggregatibacter actinomycetemcomitans in the world population: a systematic review. Clin Oral Investig 2022; 26:2317-2334. [DOI: 10.1007/s00784-021-04343-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Accepted: 12/09/2021] [Indexed: 12/11/2022]
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5
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Hbibi A, Bouziane A, Lyoussi B, Zouhdi M, Benazza D. Aggregatibacter actinomycetemcomitans: From Basic to Advanced Research. ADVANCES IN EXPERIMENTAL MEDICINE AND BIOLOGY 2022; 1373:45-67. [DOI: 10.1007/978-3-030-96881-6_3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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6
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Claesson R, Johansson A, Höglund Åberg C, Esberg A, Haubek D, Oscarsson J. Multilocus Sequence Typing of Non-JP2 Serotype b Aggregatibacter actinomycetemcomitans Strains of Ghanaian and Swedish Origin. Front Cell Infect Microbiol 2022; 11:769671. [PMID: 34970507 PMCID: PMC8712761 DOI: 10.3389/fcimb.2021.769671] [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: 09/02/2021] [Accepted: 11/26/2021] [Indexed: 11/21/2022] Open
Abstract
Objective and Methods The Gram-negative bacterium, Aggregatibacter actinomycetemcomitans is associated with periodontitis affecting young individuals. The geographic dissemination of the highly leukotoxic JP2 genotype of serotype b of this species was previously studied by multilocus sequence typing (MLST). Here, we have used MLST to genetically characterize non-JP2 genotype strains of serotype b, isolated from individuals living in Ghana (n=41), and in Sweden (n=13), respectively. Results The MLST analysis revealed a total of nine sequence types (ST). Both Ghanaian and Swedish isolates were distributed in ST 1-3. ST 5 and 6 were only identified among the Ghanaian strains, whereas ST 4, 7, 8 and 9 were uniquely represented among the Swedish strains. Previously, we characterized these non-JP2 genotype strains of A. actinomycetemcomitans serotype b by arbitrarily-primed (AP)-PCR, which distributed them into three groups, AP-PCR type 1, 2, and 3, respectively. AP-PCR type 1 strains are generally highly leukotoxic, and are associated with progression of periodontal attachment loss. As AP-PCR type 1 includes both JP2 genotype strains and a proportion of non-JP2 genotype strains of serotype b, a straightforward diagnostic procedure has been sought. This has revealed a gene, cagE, which appears to be conserved only in this AP-PCR type. According to our results, MLST was not a highly discriminatory method to identify AP-PCR type 1, as strains of this AP-PCR type could be found within three different ST: ST 2, ST 3 and ST 8. Conclusion According to MLST, a geographic dissemination of non-JP2 genotype A. actinomycetemcomitans serotype b appears to exist. However, aiming to identify carriers of AP-PCR type 1, non-JP2 genotype serotype b, PCR with cagE-specific primers is likely the most efficient diagnostic procedure known today.
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Affiliation(s)
- Rolf Claesson
- Division of Oral Microbiology, Department of Odontology, Umeå University, Umeå, Sweden
| | - Anders Johansson
- Division of Molecular Periodontology, Department of Odontology, Umeå University, Umeå, Sweden
| | - Carola Höglund Åberg
- Division of Molecular Periodontology, Department of Odontology, Umeå University, Umeå, Sweden
| | - Anders Esberg
- Department of Odontology, Umeå University, Umeå, Sweden
| | - Dorte Haubek
- Section for Paediatric Dentistry, Department of Dentistry and Oral Health, Aarhus University, Aarhus, Denmark
| | - Jan Oscarsson
- Division of Oral Microbiology, Department of Odontology, Umeå University, Umeå, Sweden
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Prevalence of JP2 and Non-JP2 Genotypes of Aggregatibacter actinomycetemcomitans and Oral Hygiene Practice of Kenyan Adolescents in Maasai Mara. Pathogens 2021; 10:pathogens10040488. [PMID: 33920549 PMCID: PMC8073413 DOI: 10.3390/pathogens10040488] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2021] [Revised: 04/13/2021] [Accepted: 04/14/2021] [Indexed: 11/21/2022] Open
Abstract
Aggregatibacter actinomycetemcomitans is implicated in the etiology of periodontitis that affects adolescents. The monitoring and mapping of the geographic dissemination pattern of JP2 and non-JP2 genotypes of A. actinomycetemcomitans are of interest. In Africa, the highly leukotoxic JP2 genotype is known to be prevalent, particularly in north-west Africa. The aims of this study were to determine the prevalence of JP2 and non-JP2 genotypes and investigate the oral hygiene practices among adolescents living in Maasai Mara, Kenya. A total of 284 adolescents (mean age: 15.0 yrs; SD 1.1) were interviewed regarding their age, gender, medical history, and oral hygiene practice, and the number of teeth present was recorded. One subgingival pooled plaque sample from all the first molars of each participant was analyzed by conventional PCR. The mean number of permanent teeth present was 27.9 (SD: 2.0; range: 22–32; 95% CI: 27.7–28.1). Sixteen (5.6%) and two (0.7%) adolescents were positive for non-JP2 and JP2 genotypes, respectively. For the vast majority of the adolescents, the use of a toothbrush (99.3%) and toothpaste (80.1%), as well as some kind of toothpick (>60.2%), were part of their oral hygiene practice, with dental floss (0.4%) and/or mouth rinses (0.4%) rarely being used. We have, for the first time, identified Kenyan adolescents colonized with the JP2 genotype. The prevalence of the JP2 genotype of A. actinomycetemcomitans is low, a possible indicator that spreading through human migration from North and West Africa to East Africa is a rare occasion.
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Yoshida A, Bouziane A, Erraji S, Lakhdar L, Rhissassi M, Miyazaki H, Ansai T, Iwasaki M, Ennibi O. Etiology of aggressive periodontitis in individuals of African descent. JAPANESE DENTAL SCIENCE REVIEW 2021; 57:20-26. [PMID: 33737991 PMCID: PMC7946349 DOI: 10.1016/j.jdsr.2020.12.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/01/2020] [Revised: 12/22/2020] [Accepted: 12/30/2020] [Indexed: 12/30/2022] Open
Abstract
Aggressive periodontitis (AgP) is a form of periodontitis that affects adolescents and has a significantly higher prevalence in individuals of African descent. AgP typically shows familial aggregation, suggesting a genetic predisposition. Young age, good health status, rapid attachment loss, and familial aggregation are the primary features of this disease. AgP has been closely linked to specific bacterial strains of Aggregatibacter actinomycetemcomitans. A. actinomycetemcomitans strains isolated from patients with AgP produce leukotoxin (LtxA), which specifically affects polymorphonuclear leukocytes in primates, especially humans. High-throughput 16S rRNA gene sequencing and bioinformatics analyses revealed differences in the subgingival microbiota between patients with AgP and those with chronic periodontitis (ChP). The genera Atopobium and Prevotella show increased prevalences in AgP than in ChP. According to AgP susceptibility, several single nucleotide polymorphisms have been detected in different genes in individuals of African descent. Interleukin (IL)-1α and IL-1β genetic polymorphisms may be associated with the severity of both ChP and AgP. An elevated serum level of IL-17 produced by Th17 cells may be a characteristic of AgP. Analyses of the relationships among bacteria, host defenses, genetic predisposition, and numerous other factors are required to understand the progression of this disease.
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Affiliation(s)
- Akihiro Yoshida
- Department of Oral Microbiology, Faculty of Dentistry, Matsumoto Dental University, Shiojiri, Japan
| | - Amal Bouziane
- Department of Periodontology, School of Medicine Dentistry, Mohammed V University, Rabat, Morocco
| | - Samir Erraji
- Department of Periodontology, School of Medicine Dentistry, Mohammed V University, Rabat, Morocco
| | - Leila Lakhdar
- Department of Periodontology, School of Medicine Dentistry, Mohammed V University, Rabat, Morocco
| | - Meryem Rhissassi
- Department of Periodontology, School of Medicine Dentistry, Mohammed V University, Rabat, Morocco
| | - Hideo Miyazaki
- Department of Dental Technology, Meirin College, Niigata, Japan
| | - Toshihiro Ansai
- Division of Community Oral Health Development, Kyushu Dental University, Kitakyushu, Japan
| | | | - Oumkeltoum Ennibi
- Department of Periodontology, School of Medicine Dentistry, Mohammed V University, Rabat, Morocco
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Amado PPP, Kawamoto D, Albuquerque-Souza E, Franco DC, Saraiva L, Casarin RCV, Horliana ACRT, Mayer MPA. Oral and Fecal Microbiome in Molar-Incisor Pattern Periodontitis. Front Cell Infect Microbiol 2020; 10:583761. [PMID: 33117737 PMCID: PMC7578221 DOI: 10.3389/fcimb.2020.583761] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2020] [Accepted: 09/09/2020] [Indexed: 12/16/2022] Open
Abstract
In order to improve our understanding on the microbial complexity associated with Grade C/molar-incisor pattern periodontitis (GC/MIP), we surveyed the oral and fecal microbiomes of GC/MIP and compared to non-affected individuals (Control). Seven Afro-descendants with GC/MIP and seven age/race/gender-matched controls were evaluated. Biofilms from supra/subgingival sites (OB) and feces were collected and submitted to 16S rRNA sequencing. Aggregatibacter actinomycetemcomitans (Aa) JP2 clone genotyping and salivary nitrite levels were determined. Supragingival biofilm of GC/MIP presented greater abundance of opportunistic bacteria. Selenomonas was increased in subgingival healthy sites of GC/MIP compared to Control. Synergistetes and Spirochaetae were more abundant whereas Actinobacteria was reduced in OB of GC/MIP compared to controls. Aa abundance was 50 times higher in periodontal sites with PD≥ 4 mm of GC/MIP than in controls. GC/MIP oral microbiome was characterized by a reduction in commensals such as Kingella, Granulicatella, Haemophilus, Bergeyella, and Streptococcus and enrichment in periodontopathogens, especially Aa and sulfate reducing Deltaproteobacteria. The oral microbiome of the Aa JP2-like+ patient was phylogenetically distant from other GC/MIP individuals. GC/MIP presented a higher abundance of sulfidogenic bacteria in the feces, such as Desulfovibrio fairfieldensis, Erysipelothrix tonsillarum, and Peptostreptococcus anaerobius than controls. These preliminary data show that the dysbiosis of the microbiome in Afro-descendants with GC/MIP was not restricted to affected sites, but was also observed in supragingival and subgingival healthy sites, as well as in the feces. The understanding on differences of the microbiome between healthy and GC/MIP patients will help in developing strategies to improve and monitor periodontal treatment.
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Affiliation(s)
- Pâmela Pontes Penas Amado
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Dione Kawamoto
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Emmanuel Albuquerque-Souza
- Division of Periodontology, Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil
| | - Diego Castillo Franco
- Department of Biological Oceanography, Oceanographic Institute, University of São Paulo, São Paulo, Brazil.,Institute of Environmental Sciences, Faculty of Biology, Jagiellonian University, Kraków, Poland
| | - Luciana Saraiva
- Division of Periodontology, Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil
| | - Renato Corrêa Viana Casarin
- Department of Prosthodontics and Periodontics, Piracicaba Dental School, State University of Campinas, São Paulo, Brazil
| | | | - Marcia Pinto Alves Mayer
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.,Division of Periodontology, Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil
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Velsko IM, Harrison P, Chalmers N, Barb J, Huang H, Aukhil I, Shaddox L. Grade C molar-incisor pattern periodontitis subgingival microbial profile before and after treatment. J Oral Microbiol 2020; 12:1814674. [PMID: 33062199 PMCID: PMC7534306 DOI: 10.1080/20002297.2020.1814674] [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] [Indexed: 12/02/2022] Open
Abstract
Aim: This study evaluated the influence of periodontal therapy on the microbiological profile of individuals with Grade C Molar-Incisor Pattern Periodontitis (C/MIP). Methods: Fifty-three African-American participants between the ages of 5–25, diagnosed with C/MIP were included. Patients underwent full mouth mechanical debridement with systemic antibiotics (metronidazole 250 mg + amoxicillin 500 mg, tid, 7 days). Subgingival samples were collected from a diseased and a healthy site from each individual prior to treatment and at 3, 6, 12, 18 and 24 months after therapy from the same sites. Samples were subjected to a 16S rRNA gene based-microarray. Results: Treatment was effective in reducing the main clinical parameters of disease. Aggregatibacter actinomycetemcomitans (A.a.) was the strongest species associated with diseased sites. Other species associated with diseased sites were Treponema lecithinolyticum and Tannerella forsythia. Species associated with healthy sites were Rothia dentocariosa/mucilaginosa, Eubacterium yurii, Parvimonas micra, Veillonella spp., Selenomonas spp., and Streptococcus spp. Overall, treatment was effective in strongly reducing A.a. and other key pathogens, as well as increasing health-associated species. These changes were maintained for at least 6 months. Conclusions:Treatment reduced putative disease-associated species, particularly A.a., and shifted the microbial profile to more closely resemble a healthy-site profile. (Clinicaltrials.gov registration #NCT01330719).
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Affiliation(s)
- Irina M Velsko
- Department of Archaeogenetics, Max Planck Institute for the Science of Human History, Jena, Germany
| | - Peter Harrison
- Department of Periodontology, College of Dentistry, University of Florida, Gainesville, FL, USA.,Department of Periodontology, Trinity College, Dublin, Ireland
| | | | - Jennifer Barb
- Clinical Center Nursing Department, Clinical Center, National Institutes of Health, Bethesda, MD, USA
| | - Hong Huang
- Department of Periodontology, College of Dentistry, University of Florida, Gainesville, FL, USA
| | - Ikramuddin Aukhil
- Department of Periodontology, College of Dentistry, University of Florida, Gainesville, FL, USA
| | - Luciana Shaddox
- Department of Periodontology, College of Dentistry, University of Florida, Gainesville, FL, USA.,Center for Oral Health Research, University of Kentucky College of Dentistry, Lexington, KY, USA
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Claesson R, Chiang HM, Lindholm M, Höglund Åberg C, Haubek D, Johansson A, Oscarsson J. Characterization of Aggregatibacter actinomycetemcomitans Serotype b Strains with Five Different, Including Two Novel, Leukotoxin Promoter Structures. Vaccines (Basel) 2020; 8:vaccines8030398. [PMID: 32698444 PMCID: PMC7563764 DOI: 10.3390/vaccines8030398] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2020] [Revised: 07/15/2020] [Accepted: 07/16/2020] [Indexed: 01/23/2023] Open
Abstract
The JP2 genotype of A. actinomycetemcomitans, serotype b has attracted much interest during the past three decades due to its close association with periodontitis in young individuals and the enhanced expression of a leukotoxin (LtxA). A typical feature of this genotype is a 530-base pair (bp) deletion in the ltxCABD promoter region controlling leukotoxin expression. In the present work, we have characterized serotype b strains with four additional promoter types. Two novel types have been recognized, that is, one with a 230-bp deletion and one with a 172-bp duplication. Moreover, a strain with a 640-bp deletion and three strains with a full-length promoter, including the type strain Y4, were included in the present study. The seven strains were characterized by multi locus sequence typing (MLST) and arbitrarily primed polymerase chain reaction (PCR) and assessed for LtxA production. MLST showed that the strains with the non-JP2-like deletions represented distinct monophyletic groups, whereas the JP2 strain, HK1651, represented a separate branch. LtxA production was high in all three strains with a promoter deletion, whereas the other four strains showed significantly lower levels. It can be concluded that the genetic characterization and determination of LtxA production of A. actinomycetemcomitans isolates from individuals with periodontitis can contribute to the identification of novel virulent genotypes of this bacterium.
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Affiliation(s)
- Rolf Claesson
- Division of Oral Microbiology, Department of Odontology, Umeå University, S-90187 Umeå, Sweden; (M.L.); (J.O.)
- Correspondence:
| | - Huei-Min Chiang
- Division of Molecular Periodontology, Department of Odontology, Umeå University, S-90187 Umeå, Sweden; (H.-M.C.); (C.H.Å.); (A.J.)
| | - Mark Lindholm
- Division of Oral Microbiology, Department of Odontology, Umeå University, S-90187 Umeå, Sweden; (M.L.); (J.O.)
| | - Carola Höglund Åberg
- Division of Molecular Periodontology, Department of Odontology, Umeå University, S-90187 Umeå, Sweden; (H.-M.C.); (C.H.Å.); (A.J.)
| | - Dorte Haubek
- Section for Paediatric Dentistry, Department of Dentistry and Oral Health, Aarhus University, 8000 Aarhus, Denmark;
| | - Anders Johansson
- Division of Molecular Periodontology, Department of Odontology, Umeå University, S-90187 Umeå, Sweden; (H.-M.C.); (C.H.Å.); (A.J.)
| | - Jan Oscarsson
- Division of Oral Microbiology, Department of Odontology, Umeå University, S-90187 Umeå, Sweden; (M.L.); (J.O.)
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Yan X, Lu H, Zhang L, Zhu B, Piao M, Huang B, Zhang H, Meng H. A three-year study on periodontal microorganisms of short locking-taper implants and adjacent teeth in patients with history of periodontitis. J Dent 2020; 95:103299. [DOI: 10.1016/j.jdent.2020.103299] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2019] [Revised: 02/06/2020] [Accepted: 02/14/2020] [Indexed: 10/25/2022] Open
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Nørskov-Lauritsen N, Claesson R, Jensen AB, Åberg CH, Haubek D. Aggregatibacter Actinomycetemcomitans: Clinical Significance of a Pathobiont Subjected to Ample Changes in Classification and Nomenclature. Pathogens 2019; 8:E243. [PMID: 31752205 PMCID: PMC6963667 DOI: 10.3390/pathogens8040243] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Revised: 11/10/2019] [Accepted: 11/13/2019] [Indexed: 12/13/2022] Open
Abstract
Aggregatibacter actinomycetemcomitans is a Gram-negative bacterium that is part of the oral microbiota. The aggregative nature of this pathogen or pathobiont is crucial to its involvement in human disease. It has been cultured from non-oral infections for more than a century, while its portrayal as an aetiological agent in periodontitis has emerged more recently. A. actinomycetemcomitans is one species among a plethora of microorganisms that constitute the oral microbiota. Although A. actinomycetemcomitans encodes several putative toxins, the complex interplay with other partners of the oral microbiota and the suppression of host response may be central for inflammation and infection in the oral cavity. The aim of this review is to provide a comprehensive update on the clinical significance, classification, and characterisation of A. actinomycetemcomitans, which has exclusive or predominant host specificity for humans.
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Affiliation(s)
| | - Rolf Claesson
- Department of Odontology, Division of Oral Microbiology, Umeå University, S-901 87 Umeå, Sweden;
| | - Anne Birkeholm Jensen
- Department of Dentistry and Oral Health, Aarhus University, DK-8000 Aarhus C, Denmark;
| | - Carola Höglund Åberg
- Department of Odontology, Division of Molecular Periodontology, Umeå University, S-901 87 Umeå, Sweden
| | - Dorte Haubek
- Department of Dentistry and Oral Health, Aarhus University, DK-8000 Aarhus C, Denmark;
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14
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Aggregatibacter actinomycetemcomitans colonization and persistence in a primate model. Proc Natl Acad Sci U S A 2019; 116:22307-22313. [PMID: 31611409 DOI: 10.1073/pnas.1905238116] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Aggregatibacter actinomycetemcomitans is associated with aggressive periodontitis resulting in premature tooth loss in adolescents. Tooth adherence and biofilm persistence are prerequisites for survival in the oral domain. Here, using a rhesus monkey model, 16S rRNA sequencing, and weighted network analysis, we assessed colonization of A. actinomycetemcomitans variants and ascertained microbial interactions in biofilm communities. Variants in A. actinomycetemcomitans leukotoxin (ltx) were created, labeled, inoculated, and compared with their progenitor strain for in vivo colonization. Samples of tooth-related plaque were assessed for colonization at baseline and after debridement and inoculation of labeled strains. Null, minimal, and hyper-Ltx-producing strains were created and assessed for hydroxyapatite binding and biofilm formation in vitro. Ltx-hyperproducing strains colonized with greater prevalence and at higher levels than wild type or ltx mutants (P = 0.05). Indigenous and inoculated A. actinomycetemcomitans strains that attached were associated with lactate-producing species (i.e., Leptotrichia, Abiotrophia, and Streptoccocci). A. actinomycetemcomitans was found at 0.13% of the total flora at baseline and at 0.05% 4 wk after inoculation. In vivo data were supported by in vitro results. We conclude that hyper-Ltx production affords these strains with an attachment advantage providing a foothold for competition with members of the indigenous microbiota. Increased attachment can be linked to ltx gene expression and up-regulation of adherence-associated genes. Growth of attached A. actinomycetemcomitans in vivo was enhanced by lactate availability due to consorting species. These associations provide A. actinomycetemcomitans with the constituents required for its colonization and survival in the complex and competitive oral environment.
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Gómez-Bañuelos E, Mukherjee A, Darrah E, Andrade F. Rheumatoid Arthritis-Associated Mechanisms of Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans. J Clin Med 2019; 8:jcm8091309. [PMID: 31454946 PMCID: PMC6780899 DOI: 10.3390/jcm8091309] [Citation(s) in RCA: 69] [Impact Index Per Article: 13.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 08/20/2019] [Accepted: 08/21/2019] [Indexed: 12/19/2022] Open
Abstract
Rheumatoid arthritis (RA) is an autoimmune disease of unknown etiology characterized by immune-mediated damage of synovial joints and antibodies to citrullinated antigens. Periodontal disease, a bacterial-induced inflammatory disease of the periodontium, is commonly observed in RA and has implicated periodontal pathogens as potential triggers of the disease. In particular, Porphyromonas gingivalis and Aggregatibacter actinomycetemcomitans have gained interest as microbial candidates involved in RA pathogenesis by inducing the production of citrullinated antigens. Here, we will discuss the clinical and mechanistic evidence surrounding the role of these periodontal bacteria in RA pathogenesis, which highlights a key area for the treatment and preventive interventions in RA.
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Affiliation(s)
- Eduardo Gómez-Bañuelos
- Division of Rheumatology, The Johns Hopkins University School of Medicine, Baltimore, MD 21224, USA
| | - Amarshi Mukherjee
- Division of Rheumatology, The Johns Hopkins University School of Medicine, Baltimore, MD 21224, USA
| | - Erika Darrah
- Division of Rheumatology, The Johns Hopkins University School of Medicine, Baltimore, MD 21224, USA
| | - Felipe Andrade
- Division of Rheumatology, The Johns Hopkins University School of Medicine, Baltimore, MD 21224, USA.
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Harris TH, Wallace MR, Huang H, Li H, Shaddox LM. Associations of P2RX7 Functional Diplotypes with Localized Aggressive Periodontitis. JDR Clin Trans Res 2019; 4:342-351. [PMID: 31319038 DOI: 10.1177/2380084419863789] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
AIM The purpose of this study was to test for the role of the P2X7 receptor in localized aggressive periodontitis (LAP). METHODS Peripheral blood was obtained from 95 subjects with LAP and 76 healthy unrelated controls (HUCs). Three P2RX7 single-nucleotide polymorphisms (rs1718119, rs2230911, and rs3751143) were genotyped from these subjects, and their peripheral blood samples were stimulated with lipopolysaccharide (LPS) from Escherichia coli and tested for inflammatory markers. The 3 P2RX7 single-nucleotide polymorphisms were in found to be in perfect linkage disequilibrium, and a total of 4 haplotypes and 9 diplotypes were identified among all subjects. For both subject populations, the 9 diplotypes were grouped into 4 functional groups and tested for association with subject inflammatory response. To specifically study the effects of extrinsic activation of the P2X7 receptor in LAP, peripheral blood samples from were stimulated under 3 treatments: LPS, LPS + ATP, and LPS +ATP+ P2X7 selective inhibitor. The effects of these treatments on P2X7 receptor activity were measured through Luminex protein assay. Last, to test whether receptor stimulation was related to P2RX7 expression, relative mRNA levels of P2RX7 were quantified with real-time quantitative polymerase chain reaction. RESULTS Several associations between the P2RX7 diplotypes and LPS-stimulated blood chemokine/cytokine levels were found between the LAP and HUC populations (P < 0.05). P2X7 activation resulted in statistically significant differences in IL-1β and IL-12p40 concentrations for both subject populations. The relative P2RX7 mRNA levels increased significantly after addition of its inhibitor for both LAP and HUC populations. CONCLUSIONS This study detected an association between P2RX7 functional diplotypes and in vitro immune response of whole blood from subjects with LAP. In addition, we found that inhibition of the activated P2X7 receptor leads to increased P2RX7 mRNA levels, suggesting a feedback loop ( ClinicalTrials.gov NCT01330719). KNOWLEDGE TRANSFER STATEMENT The results of this study suggest that P2RX7 functional diplotypes are associated with LAP and their in vitro immune response to bacteria. Ongoing studies to uncover the mechanistic link between P2RX7 and LAP phenotypes could lead to the development of preventive approaches for susceptible subjects.
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Affiliation(s)
- T H Harris
- Department of Periodontology, College of Dentistry, University of Florida, Gainesville, FL, USA.,Department of Oral Biology, College of Dentistry, University of Florida, Gainesville, FL, USA
| | - M R Wallace
- Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville, FL, USA.,University of Florida Genetics Institute, Gainesville, FL, USA
| | - H Huang
- Department of Periodontology, College of Dentistry, University of Florida, Gainesville, FL, USA
| | - H Li
- Department of Molecular Genetics and Microbiology, College of Medicine, University of Florida, Gainesville, FL, USA
| | - L M Shaddox
- Department of Periodontology, College of Dentistry, University of Florida, Gainesville, FL, USA.,Current affiliation: Division of Periodontology, Department of Oral Health Practice, College of Dentistry, University of Kentucky, Lexington, KY, USA
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Fine DH, Patil AG, Velusamy SK. Aggregatibacter actinomycetemcomitans ( Aa) Under the Radar: Myths and Misunderstandings of Aa and Its Role in Aggressive Periodontitis. Front Immunol 2019; 10:728. [PMID: 31040843 PMCID: PMC6476972 DOI: 10.3389/fimmu.2019.00728] [Citation(s) in RCA: 76] [Impact Index Per Article: 15.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2018] [Accepted: 03/19/2019] [Indexed: 11/23/2022] Open
Abstract
Aggregatibacter actinomycetemcomitans (Aa) is a low-abundance Gram-negative oral pathobiont that is highly associated with a silent but aggressive orphan disease that results in periodontitis and tooth loss in adolescents of African heritage. For the most part Aa conducts its business by utilizing strategies allowing it to conceal itself below the radar of the host mucosal immune defense system. A great deal of misinformation has been conveyed with respect to Aa biology in health and disease. The purpose of this review is to present misconceptions about Aa and the strategies that it uses to colonize, survive, and evade the host. In the process Aa manages to undermine host mucosal defenses and contribute to disease initiation. This review will present clinical observational, molecular, and interventional studies that illustrate genetic, phenotypic, and biogeographical tactics that have been recently clarified and demonstrate how Aa survives and suppresses host mucosal defenses to take part in disease pathogenesis. At one point in time Aa was considered to be the causative agent of Localized Aggressive Periodontitis. Currently, it is most accurate to look at Aa as a community activist and necessary partner of a pathogenic consortium that suppresses the initial host response so as to encourage overgrowth of its partners. The data for Aa's activist role stems from molecular genetic studies complemented by experimental animal investigations that demonstrate how Aa establishes a habitat (housing), nutritional sustenance in that habitat (food), and biogeographical mobilization and/or relocation from its initial habitat (transportation). In this manner Aa can transfer to a protected but vulnerable domain (pocket or sulcus) where its community activism is most useful. Aa's “strategy” includes obtaining housing, food, and transportation at no cost to its partners challenging the economic theory that “there ain't no such thing as a free lunch.” This “strategy” illustrates how co-evolution can promote Aa's survival, on one hand, and overgrowth of community members, on the other, which can result in local host dysbiosis and susceptibility to infection.
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Affiliation(s)
- Daniel H Fine
- Department of Oral Biology, Rutgers School of Dental Medicine, Newark, NJ, United States
| | - Amey G Patil
- Department of Oral Biology, Rutgers School of Dental Medicine, Newark, NJ, United States
| | - Senthil K Velusamy
- Department of Oral Biology, Rutgers School of Dental Medicine, Newark, NJ, United States
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Burgess DK, Huang H, Harrison P, Kompotiati T, Aukhil I, Shaddox LM. Non-Surgical Therapy Reduces Presence of JP2 Clone in Localized Aggressive Periodontitis. J Periodontol 2017; 88:1263-1270. [PMID: 28820321 DOI: 10.1902/jop.2017.170285] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
BACKGROUND Previous studies have provided substantial evidence of the association of Aggregatibacter actinomycetemcomitans, and its highly leukotoxic JP2 genotype, with localized aggressive periodontitis (LAgP). The present study aims to evaluate presence of JP2 in individuals with LAgP after periodontal treatment. METHODS Sixty African-American patients with LAgP, aged 5 to 25 years, were examined. At baseline, probing depth (PD), clinical attachment level (CAL), bleeding on probing, and plaque index were measured, and subgingival plaque was collected from LAgP diseased and healthy sites for each participant. Patients received whole-mouth ultrasonic debridement, scaling and root planing, and a 7-day prescription of amoxicillin and metronidazole. Participants were reevaluated and resampled and received regular maintenance therapy at 3, 6, and 12 months after treatment. Polymerase chain reaction was used to detect presence of the JP2 genotype before and after treatment. RESULTS At baseline, the JP2 sequence was identified in 75% of LAgP diseased sites and in 56.67% of healthy sites. At 3, 6, and 12 months after treatment, the number of patients was 40, 31, and 31, respectively, and JP2 detection decreased to 17.5%, 6.45%, and 3.23%, respectively, in diseased sites (P <0.001) and to 2.5%, 3.23%, and 0%, respectively, in healthy sites (P <0.001). Clinical parameters of disease were also significantly reduced after therapy (P <0.001). Additionally, significant correlations were observed between JP2 presence and mean PD (P <0.002) and CAL (P <0.001), after therapy. CONCLUSION Periodontal therapy was successful in reducing clinical parameters of LAgP and subgingival presence of JP2 in diseased and healthy sites.
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Affiliation(s)
| | - Hong Huang
- Department of Periodontology, University of Florida College of Dentistry, Gainesville, FL
| | - Peter Harrison
- Department of Periodontology, University of Florida College of Dentistry, Gainesville, FL.,Department of Periodontology, School of Dental Science, Trinity College Dublin, The University of Dublin, Dublin, Ireland
| | - Theodora Kompotiati
- Department of Periodontology, University of Florida College of Dentistry, Gainesville, FL
| | - Ikramuddin Aukhil
- Department of Periodontology, University of Florida College of Dentistry, Gainesville, FL
| | - Luciana M Shaddox
- Department of Periodontology, University of Florida College of Dentistry, Gainesville, FL
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