1
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Liu X, Li H. Global trends in research on aging associated with periodontitis from 2002 to 2023: a bibliometric analysis. Front Endocrinol (Lausanne) 2024; 15:1374027. [PMID: 38800469 PMCID: PMC11116588 DOI: 10.3389/fendo.2024.1374027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/21/2024] [Accepted: 04/02/2024] [Indexed: 05/29/2024] Open
Abstract
Background Aging has been implicated in many chronic inflammatory diseases, including periodontitis. Periodontitis is an inflammatory disease caused by long-term irritation of the periodontal tissues by the plaque biofilm on the surface of the teeth. However, only a few bibliometric analyses have systematically studied this field to date. This work sought to visualize research hot spots and trends in aging associated with periodontitis from 2002 to 2023 through bibliometric approaches. Methods Graphpad prism v8.0.2 was used to analyse and plot annual papers, national publication trends and national publication heat maps. In addition, CtieSpace (6.1.6R (64-bit) Advanced Edition) and VOSviewer (version 1.6.18) were used to analyse these data and visualize the scientific knowledge graph. Results The number of documents related to aging associated with periodontitis has steadily increased over 21 years. With six of the top ten institutions in terms of publications coming from the US, the US is a major driver of research in this area. journal of periodontology is the most published journal in the field. Tonetti MS is the most prolific authors and co-cited authors in the field. Journal of Periodontology and Journal of Clinical Periodontology are the most popular journals in the field with the largest literature. Periodontitis, Alzheimer's disease, and peri-implantitis are current hot topics and trends in the field. Inflammation, biomarkers, oxidative stress cytokines are current research hotspots in this field. Conclusion Our research found that global publications regarding research on aging associated with periodontitis increased dramatically and were expected to continue increasing. Inflammation and aging, and the relationship between periodontitis and systemic diseases, are topics worthy of attention.
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Affiliation(s)
| | - Hongjiao Li
- Department of Stomatology, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai, China
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2
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Liu J, Li T, Zhang S, Lu E, Qiao W, Chen H, Liu P, Tang X, Cheng T, Chen H. Proteomic and single-cell analysis shed new light on the anti-inflammatory role of interferonβ in chronic periodontitis. Front Pharmacol 2023; 14:1232539. [PMID: 37876725 PMCID: PMC10590904 DOI: 10.3389/fphar.2023.1232539] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 09/26/2023] [Indexed: 10/26/2023] Open
Abstract
Periodontitis, a condition that results in periodontal attachment loss and alveolar bone resorption, contributes to the global burden of oral disease. The underlying mechanism of periodontitis involves the dysbiosis and dyshomeostasis between host and oral microbes, among which the macrophage is one of the major innate immune cell players, producing interferon β (IFNβ) in response to bacterial infection. The objective of this research was to examine the interaction of macrophages with periodontitis and the role and mechanism of IFNβ on macrophages. IFNβ has been shown to have the potential to induce the differentiation of M1 to M2 macrophages, which are stimulated by low levels of lipopolysaccharide (LPS). Additionally, IFNβ has been demonstrated to promote the production of ISG15 by macrophages, which leads to the inhibition of the innate immune response. Moreover, our investigation revealed that IFNβ has the potential to augment the secretion of ISG15 and its downstream cytokine, IL10, in LPS-stimulated macrophages. Single-cell analysis was conducted on the gingival tissues of patients with periodontitis, which revealed a higher proportion of macrophages in the periodontitis-diseased tissue and increased expression of IFNβ, ISG15, and IL10. Gene Set Enrichment Analysis indicated that bacterial infection was associated with upregulation of IFNβ, ISG15, and IL10. Notably, only IL10 has been linked to immunosuppression, indicating that the IFNβ-ISG15-IL10 axis might promote an anti-inflammatory response in periodontitis through IL10 expression. It is also found that macrophage phenotype transitions in periodontitis involve the release of higher levels of IFNβ, ISG15, and IL10 by the anti-inflammatory M2 macrophage phenotype compared to the pro-inflammatory M1 phenotype and myeloid-derived suppressor cells (MDSCs). This implies that the IFNβ-induced production of IL10 might be linked to the M2 macrophage phenotype. Furthermore, cell communication analysis demonstrated that IL10 can promote fibroblast proliferation in periodontal tissues via STAT3 signaling.
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Affiliation(s)
- Jieying Liu
- Department of Medical Research Center, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Tianle Li
- Faculty of Dentistry, Prince Philip Dental Hospital, University of Hong Kong, Pokfulam, China
| | - Shunhao Zhang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Eryi Lu
- Department of Stomatology, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
| | - Wei Qiao
- Faculty of Dentistry, Prince Philip Dental Hospital, University of Hong Kong, Pokfulam, China
| | - Huimin Chen
- Faculty of Dentistry, Prince Philip Dental Hospital, University of Hong Kong, Pokfulam, China
| | - Peng Liu
- Department of Medical Research Center, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Xiaoyue Tang
- Department of Medical Research Center, Peking Union Medical College Hospital, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing, China
| | - Tianfan Cheng
- Faculty of Dentistry, Prince Philip Dental Hospital, University of Hong Kong, Pokfulam, China
| | - Hui Chen
- Faculty of Dentistry, Prince Philip Dental Hospital, University of Hong Kong, Pokfulam, China
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3
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Ceccarelli F, Saccucci M, Natalucci F, Olivieri G, Bruni E, Iacono R, Colasanti T, Di Carlo G, Alessandri C, Uccelletti D, Russo P, Pilloni A, Conti F, Polimeni A. Porphyromonas gingivalis amount in the tongue biofilm is associated with erosive arthritis in systemic lupus erythematosus. Lupus 2022; 31:921-926. [PMID: 35477339 DOI: 10.1177/09612033221098528] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Several data have demonstrated the occurrence of erosive arthritis in Systemic Lupus Erythematosus (SLE) patients. However, a few studies have focused on the pathogenic mechanisms involved in this feature. The implication of oral pathogens has been proved in Rheumatoid Arthritis: in particular, Porphyromonas gingivalis (Pg), by inducing citrullination, could trigger autoimmune response. Here, we evaluated amount of Pg on the tongue in a cohort of SLE patients with arthritis, focusing on the association with the erosive phenotype. METHODS SLE patients with arthritis were enrolled. DAS28 was applied to assess activity. Erosive damage was evaluated by ultrasound at level of MCP (metacarpophalangeal) and PIP (proximal interphalangeals) joints. All subjects underwent a tongue cytologic swab in order to quantify the amount of Pg (real-time PCR). The bacterium expression was obtained from the ratio between the patient's DNA amount and that obtained from healthy subjects. RESULTS 33 patients were enrolled (M/F 3/30; median age 47 years, IQR 17; median disease duration 216 months, IQR 180): 12 of them (36.4%) showed erosive damage, significantly associated with ACPA positivity (p = 0.03) and higher values of DAS28 (p = 0.01). A mean ratio of 19.7 ± 31.1 was found for Pg amount. Therefore, we used Pg mean values as threshold, identifying two groups of patients, namely, highPg and lowPg. Erosive damage was significantly more frequent in highPg patients in comparison with lowPg (60.0% vs 26.0%, p = 0.001). Furthermore, highPg patients showed higher prevalence of skin manifestations, serositis, and neurological involvement (p = 0.005, p = 0.03, p = 0.0001, respectively). CONCLUSION The possible contribution of oral microbiota in SLE erosive arthritis was here evaluated for the first time, finding a significant association between erosive damage and higher expression of Pg at tongue level.
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Affiliation(s)
- Fulvia Ceccarelli
- Lupus Clinic, Reumatologia, Dipartimento di Scienze Cliniche, Anestesiologiche e Cardiovascolari, Sapienza Università di Roma, Rome, Italy
| | - Matteo Saccucci
- Department of Oral and Maxillofacial Science, 9311Sapienza University of Rome, Italy
| | - Francesco Natalucci
- Lupus Clinic, Reumatologia, Dipartimento di Scienze Cliniche, Anestesiologiche e Cardiovascolari, Sapienza Università di Roma, Rome, Italy
| | - Giulio Olivieri
- Lupus Clinic, Reumatologia, Dipartimento di Scienze Cliniche, Anestesiologiche e Cardiovascolari, Sapienza Università di Roma, Rome, Italy
| | - Erika Bruni
- Department of Biology and Biotecnology Charles Darwin, 9311Sapienza University of Rome, Italy
| | - Roberta Iacono
- Department of Oral and Maxillofacial Science, 9311Sapienza University of Rome, Italy
| | - Tania Colasanti
- Lupus Clinic, Reumatologia, Dipartimento di Scienze Cliniche, Anestesiologiche e Cardiovascolari, Sapienza Università di Roma, Rome, Italy
| | - Gabriele Di Carlo
- Department of Oral and Maxillofacial Science, 9311Sapienza University of Rome, Italy
| | - Cristiano Alessandri
- Lupus Clinic, Reumatologia, Dipartimento di Scienze Cliniche, Anestesiologiche e Cardiovascolari, Sapienza Università di Roma, Rome, Italy
| | - Daniela Uccelletti
- Department of Biology and Biotecnology Charles Darwin, 9311Sapienza University of Rome, Italy
| | - Paola Russo
- Department of Oral and Maxillofacial Science, 9311Sapienza University of Rome, Italy
| | - Andrea Pilloni
- Department of Oral and Maxillofacial Science, 9311Sapienza University of Rome, Italy
| | - Fabrizio Conti
- Lupus Clinic, Reumatologia, Dipartimento di Scienze Cliniche, Anestesiologiche e Cardiovascolari, Sapienza Università di Roma, Rome, Italy
| | - Antonella Polimeni
- Department of Oral and Maxillofacial Science, 9311Sapienza University of Rome, Italy
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4
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Fernández A, Astorga J, Bordagaray MJ, Lira MJ, Gebicke-Haerter PJ, Hernández M. Effect of TLR9 methylation on its transcription in apical inflammation. Int Endod J 2022; 55:784-794. [PMID: 35416307 DOI: 10.1111/iej.13745] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2022] [Revised: 04/05/2022] [Accepted: 04/06/2022] [Indexed: 11/25/2022]
Abstract
AIM to explore the methylation pattern, its role on transcriptional regulation and potential modifiers of methylation of theTLR9 gene in chronic periapical inflammation. METHODOLOGY In this cross-sectional study, apical lesions of endodontic origin (ALEO, n=61) and healthy periodontal ligaments (HPL, n=15) were included. Products from bisulfited and PCR-amplified DNA were analyzed for their methylation profiles in the promoter region and at each CpG island. Additionally, TLR9 mRNA levels were quantified by qPCR and bivariate and multiple modelling were performed to better understand the influence of methylations on gene transcription. RESULTS TLR9 mRNA levels were upregulated in ALEO compared to HPL (p<0.001). TLR9 promoter CpG sites and CpG +2086 in the intragenic island 1 were demethylated in ALEO compared to HPL (p<0.05). Multivariate analysis, adjusted by smoking and gender, revealed that demethylation of TLR9 promoter sites enhanced transcriptional activity, specifically demethylated CpGs at positions -736 and -683, (p=0.02), which are close to CRE binding. Whereas ALEO reduced the global methylation of the gene-promoter and intragenic-island 2 (p<0.05) by -42.5 and -9.5 percentage points, respectively, age reduced the global methylation of intragenic-island 3 within the exon 2. CONCLUSIONS Demethylations of TLR9 promoter CpG sites, along with the intragenic DNA methylation status, were involved in higher transcription in ALEO. Hence, chronic periapical inflammation and aging modify the methylation status both in the gene promoter and in intragenic CpG islands.
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Affiliation(s)
- Alejandra Fernández
- Laboratory of Periodontal Biology, Faculty of Dentistry, Universidad de Chile, Santiago, Chile.,Faculty of Dentistry, Universidad Andres Bello, Santiago, Chile
| | - Jessica Astorga
- Laboratory of Periodontal Biology, Faculty of Dentistry, Universidad de Chile, Santiago, Chile
| | - María José Bordagaray
- Laboratory of Periodontal Biology, Faculty of Dentistry, Universidad de Chile, Santiago, Chile.,Department of Conservative Dentistry, Faculty of Dentistry, Universidad de Chile, Santiago, Chile
| | - María Jesús Lira
- Department of Orthopaedic Surgery, Pontificia Universidad Católica de Chile, Santiago, Chile
| | - Peter J Gebicke-Haerter
- Institute of Psychopharmacology, Central Institute of Mental Health, Faculty of Medicine, University of Heidelberg, Mannheim, Germany
| | - Marcela Hernández
- Laboratory of Periodontal Biology, Faculty of Dentistry, Universidad de Chile, Santiago, Chile.,Department of Pathology and Oral Medicine, Faculty of Dentistry, Universidad de Chile, Santiago, Chile
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5
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Sharawi H, Heyman O, Mizraji G, Horev Y, Laviv A, Shapira L, Yona S, Hovav AH, Wilensky A. The Prevalence of Gingival Dendritic Cell Subsets in Periodontal Patients. J Dent Res 2021; 100:1330-1336. [PMID: 33899566 DOI: 10.1177/00220345211004864] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
Abstract
As the most potent cells activating and polarizing naive T cells, dendritic cells (DCs) are of major importance in the induction of immunity and tolerance. DCs are a heterogeneous population of antigen-presenting cells that are widely distributed in lymphoid and nonlymphoid tissues. Murine studies have highlighted the important role of oral DCs and Langerhans cells (LCs) in orchestrating the physiological homeostasis of the oral mucosa. DCs are also critically involved in pathological conditions such as periodontal diseases, in which gingival DCs appear to have special localization and function. While the characterization of human DCs in health and disease has been extensively investigated in various tissues, this topic was rarely studied in human gingiva. Here, we employed an up-to-date approach to characterize by flow cytometry the gingival DCs of 27 healthy subjects and 21 periodontal patients. Four distinct subsets of mononuclear phagocytes were identified in healthy gingiva: conventional DC type 1 (cDC1), cDC2, plasmacytoid DCs (pDCs), and LCs. In periodontitis patients, the frequencies of gingival LCs and pDCs were dysregulated, as LCs decreased, whereas pDCs increased in the diseased gingiva. This shift in the prevalence of DCs was accompanied by increased expression of the proinflammatory cytokines interleukin (IL)-1β, interferon (IFN)-α, and IFN-γ, while the anti-inflammatory cytokine IL-10 was suppressed. We further found that smoking, a known risk factor of periodontitis, specifically reduces gingival LCs in healthy individuals, indicating a possible role of LCs in the elevated severity of periodontitis in smokers. Collectively, this work reveals the various DC subsets residing in the human gingiva and the impact of periodontitis, as well as smoking, on the prevalence of each subset. Our findings provide a foundation toward understanding the role of human DCs in orchestrating physiological oral immunity and set the stage for the evaluation and modulation of shifts in immunity associated with periodontitis.
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Affiliation(s)
- H Sharawi
- Department of Periodontology, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel.,The Institute of Dental Sciences, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel
| | - O Heyman
- Department of Periodontology, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel.,The Institute of Dental Sciences, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel
| | - G Mizraji
- Department of Periodontology, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel.,The Institute of Dental Sciences, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel
| | - Y Horev
- Department of Periodontology, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel.,The Institute of Dental Sciences, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel
| | - A Laviv
- Department of Oral and Maxillofacial Surgery, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel.,The Department of Oral and Maxillofacial Surgery, The Maurice and Gabriela Goldschleger School of Dental Medicine, Tel Aviv University, Tel-Aviv, Israel
| | - L Shapira
- Department of Periodontology, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel
| | - S Yona
- The Institute of Dental Sciences, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel
| | - A H Hovav
- The Institute of Dental Sciences, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel
| | - A Wilensky
- Department of Periodontology, The Hebrew University and Hadassah Medical Center, Jerusalem, Israel
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6
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Khouly I, Braun RS, Ordway M, Aouizerat BE, Ghassib I, Larsson L, Asa’ad F. The Role of DNA Methylation and Histone Modification in Periodontal Disease: A Systematic Review. Int J Mol Sci 2020; 21:ijms21176217. [PMID: 32867386 PMCID: PMC7503325 DOI: 10.3390/ijms21176217] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 08/08/2020] [Accepted: 08/11/2020] [Indexed: 02/07/2023] Open
Abstract
Despite a number of reports in the literature on the role of epigenetic mechanisms in periodontal disease, a thorough assessment of the published studies is warranted to better comprehend the evidence on the relationship between epigenetic changes and periodontal disease and its treatment. Therefore, the aim of this systematic review is to identify and synthesize the evidence for an association between DNA methylation/histone modification and periodontal disease and its treatment in human adults. A systematic search was independently conducted to identify articles meeting the inclusion criteria. DNA methylation and histone modifications associated with periodontal diseases, gene expression, epigenetic changes after periodontal therapy, and the association between epigenetics and clinical parameters were evaluated. Sixteen studies were identified. All included studies examined DNA modifications in relation to periodontitis, and none of the studies examined histone modifications. Substantial variation regarding the reporting of sample sizes and patient characteristics, statistical analyses, and methodology, was found. There was some evidence, albeit inconsistent, for an association between DNA methylation and periodontal disease. IL6, IL6R, IFNG, PTGS2, SOCS1, and TNF were identified as candidate genes that have been assessed for DNA methylation in periodontitis. While several included studies found associations between methylation levels and periodontal disease risk, there is insufficient evidence to support or refute an association between DNA methylation and periodontal disease/therapy in human adults. Further research must be conducted to identify reproducible epigenetic markers and determine the extent to which DNA methylation can be applied as a clinical biomarker.
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Affiliation(s)
- Ismael Khouly
- Department of Oral and Maxillofacial Surgery, College of Dentistry, New York University, New York, NY 10010, USA;
- Correspondence:
| | - Rosalie Salus Braun
- Department of Cariology and Comprehensive Care, College of Dentistry, New York University, New York, NY 10010, USA;
| | - Michelle Ordway
- Department of Periodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA;
| | - Bradley Eric Aouizerat
- Department of Oral and Maxillofacial Surgery, College of Dentistry, New York University, New York, NY 10010, USA;
- Bluestone Center for Clinical Research, New York University College of Dentistry, New York, NY 10010, USA
| | - Iya Ghassib
- Department of Periodontics and Oral Medicine, University of Michigan, Ann Arbor, MI 48104, USA;
| | - Lena Larsson
- Department of Periodontology, Institute of Odontology, The Sahlgrenska Academy at University of Gothenburg, SE-405 30 Göteborg, Sweden;
| | - Farah Asa’ad
- Department of Biomaterials, Institute of Clinical Sciences, The Sahlgrenska Academy at University of Gothenburg, SE-405 30 Göteborg, Sweden;
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7
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Aral K, Milward MR, Kapila Y, Berdeli A, Cooper PR. Inflammasomes and their regulation in periodontal disease: A review. J Periodontal Res 2020; 55:473-487. [PMID: 31960443 DOI: 10.1111/jre.12733] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Revised: 12/15/2019] [Accepted: 12/28/2019] [Indexed: 12/12/2022]
Abstract
Interleukin-1β (IL-1β), which is secreted by host tissues leading to periodontal tissue inflammation, is a major pro-inflammatory cytokine in the pathogenesis of periodontal disease. The conversion of pro-IL-1β into its biologically active form is controlled by multiprotein complexes named as inflammasomes, which are key regulator of host defense mechanisms and inflammasome involved diseases, including the periodontal diseases. Inflammasomes are regulated by different proteins and processes, including pyrin domain (PYD)-only proteins (POPs), CARD-only proteins (COPs), tripartite motif family proteins (TRIMs), autophagy, and interferons. A review of in vitro, in vivo, and clinical data from these publications revealed that several inflammasomes including (NOD)-like receptor (NLR) pyrin domain-containing 3 (NLRP3) and absent in melanoma 2 (AIM2) have been found to be involved in periodontal disease pathogenesis. To the best of our knowledge, the current article provides the first review of the literature focusing on studies that evaluated both inflammasomes and their regulators in periodontal disease. An upregulation for inflammasomes and a downregulation of inflammasome regulator proteins including POPs, COPs, and TRIMs have been reported in periodontal disease. Although interferons (types I and II) and autophagy have been found to be involved in periodontal disease, their possible role in inflammasome activation has not evaluated yet. Modulating the excessive inflammatory response by the use of inflammasome regulators may have potential in the management of periodontal disease.
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Affiliation(s)
- Kübra Aral
- Oral Biology, School of Dentistry, University of Birmingham, Birmingham, UK.,Republic of Turkey Ministry of Health, Ankara, Turkey
| | - Michael R Milward
- Periodontology, School of Dentistry, University of Birmingham, Birmingham, UK
| | - Yvonne Kapila
- Orofacial Sciences, The School of Dentistry, University of California San Francisco, San Francisco, CA, USA
| | - Afig Berdeli
- Molecular Genetics, Faculty of Medicine, Ege University, Izmir, Turkey
| | - Paul R Cooper
- Oral Biology, School of Dentistry, University of Birmingham, Birmingham, UK.,Department of Oral Sciences, Faculty of Dentistry, University of Otago, Dunedin, New Zealand
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8
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Jiang L, Chen XQ, Gao MJ, Lee W, Zhou J, Zhao YF, Wang GD. The Pros1/Tyro3 axis protects against periodontitis by modulating STAT/SOCS signalling. J Cell Mol Med 2019; 23:2769-2781. [PMID: 30729671 PMCID: PMC6433735 DOI: 10.1111/jcmm.14183] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2018] [Revised: 11/21/2018] [Accepted: 01/10/2019] [Indexed: 12/17/2022] Open
Abstract
Periodontitis, an oral inflammatory disease caused by periodontal pathogen infection, is the most prevalent chronic inflammatory disease and a major burden on healthcare. The TAM receptor tyrosine kinases (Tyro3, Axl and Mertk) and their ligands (Gas6 and Pros1) play a pivotal role in the resolution of inflammation and have been associated with chronic inflammatory and autoimmune diseases. In this study, we evaluated the effects of exogenous Pros1 in in vitro and in vivo models of periodontitis. We detected higher Pros1 but lower Tyro3 levels in inflamed gingival specimens of periodontitis patients compared with healthy controls. Moreover, Pros1 was mostly localized in the gingival epithelium of all specimens. In cultured human gingival epithelial cells (hGECs), Porphyromonas gingivalis LPS (p.g-LPS) stimulation down-regulated Pros1 and Tyro3. Exogenous Pros1 inhibited p.g-LPS-induced production of TNF-α, IL-6, IL-1β, MMP9/2 and RANKL in a Tyro3-dependent manner as revealed by PCR, Western blot analysis, ELISA and gelatin zymography. Pros1 also restored Tyro3 expression down-regulated by p.g-LPS in hGECs. In rats treated with ligature and p.g-LPS, administration of Pros1 attenuated periodontitis-associated gingival inflammation and alveolar bone loss. Our mechanistic studies implicated SOCS1/3 and STAT1/3 as mediators of the in vitro and in vivo anti-inflammatory effects of Pros1. Collectively, the findings from this work supported Pros1 as a novel anti-inflammatory therapy for periodontitis.
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Affiliation(s)
- Lei Jiang
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Xiao Qing Chen
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Ming Jing Gao
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Wai Lee
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Jie Zhou
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Yun Fu Zhao
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
| | - Guo Dong Wang
- Department of Stomatology, Changzheng Hospital, Second Military Medical University, Shanghai, P. R. China
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9
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AlQallaf H, Hamada Y, Blanchard S, Shin D, Gregory R, Srinivasan M. Differential profiles of soluble and cellular toll like receptor (TLR)-2 and 4 in chronic periodontitis. PLoS One 2018; 13:e0200231. [PMID: 30571680 PMCID: PMC6301611 DOI: 10.1371/journal.pone.0200231] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Accepted: 11/05/2018] [Indexed: 01/19/2023] Open
Abstract
Chronic periodontitis is a common inflammatory disease initiated by a complex microbial biofilm and mediated by the host response causing destruction of the supporting tissues of the teeth. Host recognition of pathogens is mediated by toll-like receptors (TLRs) that bind conserved molecular patterns shared by large groups of microorganisms. The oral epithelial cells respond to most periodontopathic bacteria via TLR-2 and TLR-4. In addition to the membrane-associated receptors, soluble forms of TLR-2 (sTLR-2) and TLR-4 (sTLR-4) have been identified and are thought to play a regulatory role by binding microbial ligands. sTLR-2 has been shown to arise from ectodomain shedding of the extracellular domain of the membrane receptor and sTLR-4 is thought to be an alternate spliced form. Many studies have previously reported the presence of elevated numbers of viable exfoliated epithelial cells in the saliva of patients with chronic periodontitis. The objective of this study was to investigate the potential value of salivary sTLR-2 and sTLR-4 together with the paired epithelial cell-associated TLR-2/4 mRNA as diagnostic markers for chronic periodontitis. Unstimulated whole saliva was collected after obtaining informed consent from 40 individuals with either periodontitis or gingivitis. The sTLR-2 and sTLR4 in saliva was measured by enzyme-linked immunosorbent assay. The TLR-2 and TLR-4 transcript in the epithelial cells in saliva was measured by real time polymerase chain reaction. While levels of sTLR-2 exhibited an inverse correlation, sTLR-4 positively correlated with clinical parameters in the gingivitis cohort. Interestingly, both correlations were lost in the periodontitis cohort indicating a dysregulated host response. On the other hand, while the sTLR-2 and the paired epithelial cell associated TLR-2 mRNA exhibited a direct correlation (r2 = 0.62), that of sTLR4 and TLR-4 mRNA exhibited an inverse correlation (r2 = 0.53) in the periodontitis cohort. Collectively, assessments of salivary sTLR2 and sTLR4 together with the respective transcripts in the epithelial cells could provide clinically relevant markers of disease progression from gingivitis to periodontitis.
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Affiliation(s)
- Hawra AlQallaf
- Department of Periodontics and Allied Dental Programs, School of Dentistry, Indiana University–Purdue University Indianapolis, Indianapolis, Indiana, United States of America
| | - Yusuke Hamada
- Department of Periodontics and Allied Dental Programs, School of Dentistry, Indiana University–Purdue University Indianapolis, Indianapolis, Indiana, United States of America
| | - Steven Blanchard
- Department of Periodontics and Allied Dental Programs, School of Dentistry, Indiana University–Purdue University Indianapolis, Indianapolis, Indiana, United States of America
| | - Daniel Shin
- Department of Periodontics and Allied Dental Programs, School of Dentistry, Indiana University–Purdue University Indianapolis, Indianapolis, Indiana, United States of America
| | - Richard Gregory
- Department of Biomedical and Applied Sciences, School of Dentistry, Indiana University–Purdue University Indianapolis, Indianapolis, Indiana, United States of America
| | - Mythily Srinivasan
- Department of Oral Pathology, Medicine and Radiology, School of Dentistry, Indiana University–Purdue University Indianapolis, Indianapolis, Indiana, United States of America
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10
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Ceccarelli F, Orrù G, Pilloni A, Bartosiewicz I, Perricone C, Martino E, Lucchetti R, Fais S, Vomero M, Olivieri M, di Franco M, Priori R, Riccieri V, Scrivo R, Shoenfeld Y, Alessandri C, Conti F, Polimeni A, Valesini G. Porphyromonas gingivalis in the tongue biofilm is associated with clinical outcome in rheumatoid arthritis patients. Clin Exp Immunol 2018; 194:244-252. [PMID: 30009382 DOI: 10.1111/cei.13184] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/02/2018] [Indexed: 12/24/2022] Open
Abstract
Several studies have suggested a link between human microbiome and rheumatoid arthritis (RA) development. Porphyromonas gingivalis seems involved in RA initiation and progression, as supported by the high occurrence of periodontitis. In this case-control study, we analysed tongue P. gingivalis presence and quantification in a large healthy and RA cohort. We enrolled 143 RA patients [male/female (M/F) 32/111, mean ± standard deviation (s.d.), age 57·5 ± 19·8 years, mean ± s.d. disease duration 155·9 ± 114·7 months); 36 periodontitis patients (M/F 11/25, mean ± s.d., age 56 ± 9·9 years, mean ± s.d. disease duration 25·5 ± 20·9 months); and 57 patients (M/F 12/45, mean ± s.d., age 61·4 ± 10·9 years, mean ± s.d. disease duration 62·3 ± 66·9 months) with knee osteoarthritis or fibromyalgia. All subjects underwent a standard cytological swab to identify the rate of P. gingivalis/total bacteria by using quantitative real-time polymerase chain reaction. The prevalence of P. gingivalis resulted similarly in RA and periodontitis patients (48·9 versus 52·7%, P = not significant). Moreover, the prevalence of this pathogen was significantly higher in RA and periodontitis patients in comparison with control subjects (P = 0·01 and P = 0·003, respectively). We found a significant correlation between P. gingivalis rate in total bacteria genomes and disease activity score in 28 joints (DAS28) (erythrocyte sedimentation rate) (r = 0·4, P = 0·01). RA patients in remission showed a significantly lower prevalence of P. gingivalis in comparison with non-remission (P = 0·02). We demonstrated a significant association between the percentage of P. gingivalis on the total tongue biofilm and RA disease activity (DAS28), suggesting that the oral cavity microbiological status could play a role in the pathogenic mechanisms of inflammation, leading to more active disease.
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Affiliation(s)
- F Ceccarelli
- Reumatologia, Dipartimento di Medicina Interna e Specialità Medica, Sapienza Università di Roma, Rome, Italy
| | - G Orrù
- Molecular Biology Service, University of Cagliari 'Ospedale S. Giovanni di Dio', Cagliari, Italy
| | - A Pilloni
- Odontoiatria, Dipartimento di Scienze Odontostomatologiche e Maxillo Facciali, Sapienza Università di Roma, Rome, Italy
| | - I Bartosiewicz
- Reumatologia, Dipartimento di Medicina Interna e Specialità Medica, Sapienza Università di Roma, Rome, Italy
| | - C Perricone
- Reumatologia, Dipartimento di Medicina Interna e Specialità Medica, Sapienza Università di Roma, Rome, Italy
| | - E Martino
- Odontoiatria, Dipartimento di Scienze Odontostomatologiche e Maxillo Facciali, Sapienza Università di Roma, Rome, Italy
| | - R Lucchetti
- Reumatologia, Dipartimento di Medicina Interna e Specialità Medica, Sapienza Università di Roma, Rome, Italy
| | - S Fais
- Molecular Biology Service, University of Cagliari 'Ospedale S. Giovanni di Dio', Cagliari, Italy
| | - M Vomero
- Reumatologia, Dipartimento di Medicina Interna e Specialità Medica, Sapienza Università di Roma, Rome, Italy
| | - M Olivieri
- Reumatologia, Dipartimento di Medicina Interna e Specialità Medica, Sapienza Università di Roma, Rome, Italy
| | - M di Franco
- Reumatologia, Dipartimento di Medicina Interna e Specialità Medica, Sapienza Università di Roma, Rome, Italy
| | - R Priori
- Reumatologia, Dipartimento di Medicina Interna e Specialità Medica, Sapienza Università di Roma, Rome, Italy
| | - V Riccieri
- Reumatologia, Dipartimento di Medicina Interna e Specialità Medica, Sapienza Università di Roma, Rome, Italy
| | - R Scrivo
- Reumatologia, Dipartimento di Medicina Interna e Specialità Medica, Sapienza Università di Roma, Rome, Italy
| | - Y Shoenfeld
- Zabludowicz Center for Autoimmune Diseases, Sheba Medical Center (affiliated to Tel-Aviv University), Tel-Hashomer, Israel.,Incumbent of the Laura Schwarz-Kipp Chair for Research of Autoimmune Diseases, Tel-Aviv University, Israel
| | - C Alessandri
- Reumatologia, Dipartimento di Medicina Interna e Specialità Medica, Sapienza Università di Roma, Rome, Italy
| | - F Conti
- Reumatologia, Dipartimento di Medicina Interna e Specialità Medica, Sapienza Università di Roma, Rome, Italy
| | - A Polimeni
- Odontoiatria, Dipartimento di Scienze Odontostomatologiche e Maxillo Facciali, Sapienza Università di Roma, Rome, Italy
| | - G Valesini
- Reumatologia, Dipartimento di Medicina Interna e Specialità Medica, Sapienza Università di Roma, Rome, Italy
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11
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Kaczor-Urbanowicz KE, Trivedi HM, Lima PO, Camargo PM, Giannobile WV, Grogan TR, Gleber-Netto FO, Whiteman Y, Li F, Lee HJ, Dharia K, Aro K, Carerras-Presas CM, Amuthan S, Vartak M, Akin D, Al-adbullah H, Bembey K, Klokkevold PR, Elashoff D, Barnes VM, Richter R, DeVizio W, Masters JG, Wong DTW. Salivary exRNA biomarkers to detect gingivitis and monitor disease regression. J Clin Periodontol 2018; 45:806-817. [PMID: 29779262 PMCID: PMC6023773 DOI: 10.1111/jcpe.12930] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Revised: 04/14/2018] [Accepted: 05/13/2018] [Indexed: 12/15/2022]
Abstract
AIM This study tests the hypothesis that salivary extracellular RNA (exRNA) biomarkers can be developed for gingivitis detection and monitoring disease regression. MATERIALS AND METHODS Salivary exRNA biomarker candidates were developed from a total of 100 gingivitis and non-gingivitis individuals using Affymetrix's expression microarrays. The top 10 differentially expressed exRNAs were tested in a clinical cohort to determine whether the discovered salivary exRNA markers for gingivitis were associated with clinical gingivitis and disease regression. For this purpose, unstimulated saliva was collected from 30 randomly selected gingivitis subjects, the gingival and plaque indexes scores were taken at baseline, 3 and 6 weeks and salivary exRNAs were assayed by means of reverse transcription quantitative polymerase chain reaction. RESULTS Eight salivary exRNA biomarkers developed for gingivitis were statistically significantly changed over time, consistent with disease regression. A panel of four salivary exRNAs [SPRR1A, lnc-TET3-2:1, FAM25A, CRCT1] can detect gingivitis with a clinical performance of 0.91 area under the curve, with 71% sensitivity and 100% specificity. CONCLUSIONS The clinical values of the developed salivary exRNA biomarkers are associated with gingivitis regression. They offer strong potential to be advanced for definitive validation and clinical laboratory development test.
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Affiliation(s)
| | - Harsh M. Trivedi
- Colgate Palmolive Co., Early Research Oral Care, New Jersey, 909
River Road, Piscataway, New Jersey, USA 08855
| | - Patricia O. Lima
- Center for Oral/Head & Neck Oncology Research, UCLA School
of Dentistry, University of California at Los Angeles, California, USA
- Department of Physiological Sciences, Piracicaba Dental School,
University of Campinas, Piracicaba, São Paulo, Brazil
| | - Paulo M. Camargo
- Section of Periodontics, UCLA School of Dentistry, University of
California at Los Angeles, California, USA
| | - William V. Giannobile
- Department of Periodontics and Oral Medicine, School of Dentistry,
University of Michigan, Ann Arbor, Michigan, USA
| | - Tristan R. Grogan
- Department of Biostatistics, University of California at Los
Angeles, California, USA
| | - Frederico O. Gleber-Netto
- Medical Genomics Laboratory, Centro Internacional de Pesquisa e
Ensino (CIPE), AC Camargo Cancer Center, São Paulo, Brazil
| | - Yair Whiteman
- Center for Esthetic Dentistry, UCLA School of Dentistry, University
of California at Los Angeles, California, USA
| | - Feng Li
- Center for Oral/Head & Neck Oncology Research, UCLA School
of Dentistry, University of California at Los Angeles, California, USA
| | - Hyo Jung Lee
- Department of Periodontology, Section of Dentistry, Seoul National
University Bundang Hospital, Seoul, Korea
| | - Karan Dharia
- UCLA School of Dentistry, University of California at Los Angeles,
California, USA
| | - Katri Aro
- Center for Oral/Head & Neck Oncology Research, UCLA School
of Dentistry, University of California at Los Angeles, California, USA
| | | | - Saarah Amuthan
- UCLA School of Dentistry, University of California at Los Angeles,
California, USA
| | - Manjiri Vartak
- UCLA School of Dentistry, University of California at Los Angeles,
California, USA
| | - David Akin
- Center for Oral/Head & Neck Oncology Research, UCLA School
of Dentistry, University of California at Los Angeles, California, USA
| | - Hiba Al-adbullah
- UCLA School of Dentistry, University of California at Los Angeles,
California, USA
| | - Kanika Bembey
- UCLA School of Dentistry, University of California at Los Angeles,
California, USA
| | - Perry R. Klokkevold
- Section of Periodontics, UCLA School of Dentistry, University of
California at Los Angeles, California, USA
| | - David Elashoff
- Department of Biostatistics, University of California at Los
Angeles, California, USA
| | - Virginia Monsul Barnes
- Colgate Palmolive Co., Clinical Research Oral Care, New Jersey, 909
River Road, Piscataway, New Jersey, USA 08855
| | - Rose Richter
- Colgate Palmolive Co., Clinical Research Oral Care, New Jersey, 909
River Road, Piscataway, New Jersey, USA 08855
| | - William DeVizio
- Colgate Palmolive Co., Clinical Research Oral Care, New Jersey, 909
River Road, Piscataway, New Jersey, USA 08855
| | - James G. Masters
- Colgate Palmolive Co., Early Research Oral Care, New Jersey, 909
River Road, Piscataway, New Jersey, USA 08855
| | - David T. W. Wong
- Center for Oral/Head & Neck Oncology Research, UCLA School
of Dentistry, University of California at Los Angeles, California, USA
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12
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Narayan I, Gowda TM, Mehta DS, Kumar BT. Estimation of Toll-like receptor 9 in gingival tissues of patients with chronic periodontitis with or without hyperlipidemia and its association with the presence of Porphyromonas gingivalis. J Indian Soc Periodontol 2018; 22:298-303. [PMID: 30131620 PMCID: PMC6077972 DOI: 10.4103/jisp.jisp_124_18] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Background: Recent evidence suggests the interactions between bacterial DNA and nucleic acid receptors to play a role in inflammatory tissue destruction. The current study aims to evaluate the expression of Toll-like receptor 9 (TLR9) in periodontal disease associated with or without hyperlipidemia and to associate it with the presence of Porphyromonas gingivalis. Materials and Methods: Thirty participants in the age range of 25–50 years were randomly recruited and divided into three groups, i.e., healthy (Group I), chronic periodontitis without hyperlipidemia (Group II), and chronic periodontitis with hyperlipidemia (Group III). The gingival tissue samples were analyzed for TLR9 using immunohistochemistry, and plaque samples were analyzed for P. gingivalis using polymerase chain reaction. Results: The TLR9-positive cell ratio in gingival connective tissue for Group II and Group III was 0.95 ± 0.03 and 0.94 ± 0.03, respectively, which was significantly higher than that of Group I, with P < 0.001 (0.88 ± 0.04). These groups also demonstrated significantly higher presence of P. gingivalis as compared to Group I with P < 0.001. There was a positive association between TLR9 in gingival connective tissue and presence of P. gingivalis. Conclusion: The results of this study reveal a potential role of TLR9 in chronic periodontitis, in association with P. gingivalis. Furthermore, these variables do not show an appreciable change in hyperlipidemics suggesting a weak relation between TLR9 and lipid levels.
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Affiliation(s)
- Ipshita Narayan
- Department of Periodontics, Bapuji Dental College and Hospital, Davangere, Karnataka, India
| | | | - Dhoom Singh Mehta
- Department of Periodontics, Bapuji Dental College and Hospital, Davangere, Karnataka, India
| | - Baron Tarun Kumar
- Department of Periodontics, Bapuji Dental College and Hospital, Davangere, Karnataka, India.,Department of Periodontics, Bapuji Implant Center, Bapuji Dental College and Hospital, Davangere, Karnataka, India
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13
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Oral pathogenesis of Aggregatibacter actinomycetemcomitans. Microb Pathog 2017; 113:303-311. [DOI: 10.1016/j.micpath.2017.11.001] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2017] [Revised: 10/31/2017] [Accepted: 11/02/2017] [Indexed: 12/30/2022]
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14
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Passariello C, Gigola P, Testarelli L, Puttini M, Schippa S, Petti S. Evaluation of microbiota associated with Herpesviruses in active sites of generalized aggressive periodontitis. ANNALI DI STOMATOLOGIA 2017; 8:59-70. [PMID: 29299190 DOI: 10.11138/ads/2017.8.2.071] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Aims The present study aimed to investigate microbial patterns associated with disease progression and coinfection by different Herpesviruses in generalized aggressive periodontitis (GAP). Methods Microbiological samples were obtained from active (AS) and non-active (n-AS) sites in 165 subjects affected by GAP and were analyzed for 40 bacterial species by the Checkerboard DNA-DNA Hybridization technique and for Herpes simplex 1 (HSV-1), Human Cytomegalovirus (CMV), and Epstein Bar virus (EBV) by PCR.Common Factor Analysis and Multiple Regression Analysis were applied to disclose specific microbial patterns associated with the three viruses. Results Herpesviruses were detected in 37.6% of subjects. Detection of each of the searched viruses was associated with specific patterns of subgingival biofilm in AS. Logistic regression analyses evidenced several virus/bacteria associations: i) EBV with Aggregatibacter actinomycetemcomitans; ii) CMV with A. actinomycetemcomitans, Veillonella parvula, Parvimonas micra and Fusobacterium nucleatum subsp. polymorphum; iii) HSV-1 with Porphyromonas gingivalis, Tannerella forsythia, Fusobacterium periodonticum and Staphylococcus aureus. Conclusions Microbiological data suggest that Herpesviruses are probably not mere spectators of disease progression and that specific patterns of subgingival plaque are correlated with the presence of different Herpesviruses.
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Affiliation(s)
- Claudio Passariello
- Department of Public Health and Infectious Diseases, " Sapienza" University of Rome, Rome, Italy
| | - Pierangelo Gigola
- Department of Medical-Surgical Specialties, Radiologic and Public Health Sciences University of Brescia, Brescia, Italy
| | - Luca Testarelli
- Department of Odontostomatologic and Maxillo-Facial Sciences, "Sapienza" University of Rome, Rome, Italy
| | | | - Serena Schippa
- Department of Public Health and Infectious Diseases, " Sapienza" University of Rome, Rome, Italy
| | - Stefano Petti
- Department of Public Health and Infectious Diseases, " Sapienza" University of Rome, Rome, Italy
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15
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Mizraji G, Nassar M, Segev H, Sharawi H, Eli-Berchoer L, Capucha T, Nir T, Tabib Y, Maimon A, Dishon S, Shapira L, Nussbaum G, Wilensky A, Hovav AH. Porphyromonas gingivalis Promotes Unrestrained Type I Interferon Production by Dysregulating TAM Signaling via MYD88 Degradation. Cell Rep 2017; 18:419-431. [DOI: 10.1016/j.celrep.2016.12.047] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2016] [Revised: 11/21/2016] [Accepted: 12/14/2016] [Indexed: 01/12/2023] Open
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16
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Díaz-Zúñiga J, Monasterio G, Alvarez C, Melgar-Rodríguez S, Benítez A, Ciuchi P, García M, Arias J, Sanz M, Vernal R. Variability of the dendritic cell response triggered by different serotypes of Aggregatibacter actinomycetemcomitans or Porphyromonas gingivalis is toll-like receptor 2 (TLR2) or TLR4 dependent. J Periodontol 2016; 86:108-19. [PMID: 25224175 DOI: 10.1902/jop.2014.140326] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND Different serotypes of Aggregatibacter actinomycetemcomitans and Porphyromonas gingivalis have been shown to induce differential dendritic cell (DC) responses. This study investigates whether cytokine and CC-chemokine receptor (CCR) production by DCs stimulated with different serotypes of A. actinomycetemcomitans or P. gingivalis is Toll-like receptor 2 (TLR2) and/or TLR4 dependent. METHODS DCs were obtained from healthy individuals and primed at a multiplicity of infection (MOI) of 10(2) with different A. actinomycetemcomitans or P. gingivalis serotypes in the presence or absence of anti-TLR2 or anti-TLR4 blocking antibodies. TLR2 and TLR4 expression, CCR5 and CCR6 expression, and interleukin (IL)-1β, IL-10, IL-12, and IL-23 expression and secretion were quantified by flow cytometry, real-time reverse-transcription polymerase chain reaction, and enzyme-linked immunosorbent assay. RESULTS When DCs were stimulated with serotype b of A. actinomycetemcomitans or serotype K1 of P. gingivalis, higher levels of TLR2 or TLR4, respectively, were detected compared to DCs stimulated with the other serotypes. Similarly, higher levels of cytokines and CCRs were detected in serotype b- or serotype K1-primed DCs compared to the others, and these increased levels positively correlated with levels of TLR2 or TLR4. When TLR2 signaling was blocked using a specific anti-TLR2 monoclonal antibody, serotype b-induced cytokine and CCR expression was inhibited; when TLR4 signaling was blocked, serotype K1-induced response was inhibited. CONCLUSIONS These results demonstrate that the variability of secretion of cytokines and expression of CCRs detected in DCs stimulated with different serotypes of A. actinomycetemcomitans or P. gingivalis is TLR2 or TLR4 dependent, respectively.
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Affiliation(s)
- Jaime Díaz-Zúñiga
- Periodontal Biology Laboratory, Department of Conservative Dentistry, Dental School, University of Chile, Santiago, Chile
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17
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Abstract
Human periodontitis is associated with a wide range of bacteria and viruses and with complex innate and adaptive immune responses. Porphyromonas gingivalis, Tannerella forsythia, Aggregatibacter actinomycetemcomitans, Treponema denticola, cytomegalovirus and other herpesviruses are major suspected pathogens of periodontitis, and a combined herpesvirus–bacterial periodontal infection can potentially explain major clinical features of the disease. Cytomegalovirus infects periodontal macrophages and T‐cells and elicits a release of interleukin‐1β and tumor necrosis factor‐α. These proinflammatory cytokines play an important role in the host defense against the virus, but they also have the potential to induce alveolar bone resorption and loss of periodontal ligament. Gingival fibroblasts infected with cytomegalovirus also exhibit diminished collagen production and release of an increased level of matrix metalloproteinases. This article reviews innate and adaptive immunity to cytomegalovirus and suggests that immune responses towards cytomegalovirus can play roles in controlling, as well as in exacerbating, destructive periodontal disease.
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18
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Slots J. Periodontal herpesviruses: prevalence, pathogenicity, systemic risk. Periodontol 2000 2015; 69:28-45. [DOI: 10.1111/prd.12085] [Citation(s) in RCA: 84] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/12/2014] [Indexed: 12/13/2022]
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19
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Huang N, Shaik-Dasthagirisaheb YB, LaValley MP, Gibson FC. Liver X receptors contribute to periodontal pathogen-elicited inflammation and oral bone loss. Mol Oral Microbiol 2015; 30:438-50. [PMID: 25946408 DOI: 10.1111/omi.12103] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/01/2015] [Indexed: 12/29/2022]
Abstract
Periodontal diseases are chronic oral inflammatory diseases that are polymicrobial in nature. The presence of specific bacteria in subgingival plaque such as Porphyromonas gingivalis is associated with microbial dysbiosis and the modulation of host immune response. Bacterially elicited innate immune activation and inflammation are key elements implicated in the destruction of soft and hard tissues supporting the teeth. Liver X receptors (LXRs) are nuclear hormone receptors with important function in lipid homeostasis, inflammation, and host response to infection; however, their contribution to chronic inflammatory diseases such as periodontal disease is not understood. The aim of this study was to define the contribution of LXRs in the development of immune response to P. gingivalis and to assess the roles that LXRs play in infection-elicited oral bone loss. Employing macrophages, we observed that P. gingivalis challenge led to reduced LXRα and LXRβ gene expression compared with that observed with unchallenged wild-type cells. Myeloid differentiation primary response gene 88 (MyD88)-independent, Toll/interleukin-1 receptor-domain-containing adapter-inducing interferon-β (TRIF)-dependent signaling affected P. gingivalis-mediated reduction in LXRα expression, whereas neither pathway influenced the P. gingivalis effect on LXRβ expression. Employing LXR agonist and mice deficient in LXRs, we observed functional effects of LXRs in the development of a P. gingivalis-elicited cytokine response at the level of the macrophage, and participation of LXRs in P. gingivalis-elicited oral bone loss. These findings identify novel importance for LXRs in the pathogenesis of P. gingivalis infection-elicited inflammation and oral bone loss.
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Affiliation(s)
- N Huang
- Section of Infectious Diseases, Department of Medicine, Boston University School of Medicine, Boston, MA, USA
| | - Y B Shaik-Dasthagirisaheb
- Section of Infectious Diseases, Department of Medicine, Boston University School of Medicine, Boston, MA, USA
| | - M P LaValley
- Department of Biostatistics, Boston University School of Public Health, Boston, MA, USA
| | - F C Gibson
- Section of Infectious Diseases, Department of Medicine, Boston University School of Medicine, Boston, MA, USA
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20
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Toll-Like Receptor 9-Mediated Inflammation Triggers Alveolar Bone Loss in Experimental Murine Periodontitis. Infect Immun 2015; 83:2992-3002. [PMID: 25964477 DOI: 10.1128/iai.00424-15] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2015] [Accepted: 05/06/2015] [Indexed: 12/15/2022] Open
Abstract
Chronic periodontitis is a local inflammatory disease induced by a dysbiotic microbiota and leading to destruction of the tooth-supporting structures. Microbial nucleic acids are abundantly present in the periodontium, derived through release after phagocytic uptake of microbes and/or from biofilm-associated extracellular DNA. Binding of microbial DNA to its cognate receptors, such as Toll-like receptor 9 (TLR9), can trigger inflammation. In this study, we utilized TLR9 knockout (TLR9(-/-)) mice and wild-type (WT) controls in a murine model of Porphyromonas gingivalis-induced periodontitis and report the first in vivo evidence that TLR9 signaling mediates the induction of periodontal bone loss. P. gingivalis-infected WT mice exhibited significantly increased bone loss compared to that in sham-infected WT mice or P. gingivalis-infected TLR9(-/-) mice, which were resistant to bone loss. Consistent with this, the expression levels of interleukin 6 (IL-6), tumor necrosis factor (TNF), and receptor-activator of nuclear factor kappa B ligand (RANKL) were significantly elevated in the gingival tissues of the infected WT mice but not in infected TLR9(-/-) mice compared to their levels in controls. Ex vivo studies using splenocytes and bone marrow-derived macrophages revealed significantly diminished cytokine production in TLR9(-/-) cells relative to the cytokine production in WT cells in response to P. gingivalis, thereby implicating TLR9 in inflammatory responses to this organism. Intriguingly, compared to the cytokine production in WT cells, TLR9(-/-) cells exhibited significantly decreased proinflammatory cytokine production upon challenge with lipopolysaccharide (LPS) (TLR4 agonist) or Pam3Cys (TLR2 agonist), suggesting possible cross talk between TLR9, TLR4, and TLR2. Collectively, our results provide the first proof-of-concept evidence implicating TLR9-triggered inflammation in periodontal disease pathogenesis, thereby identifying a new potential therapeutic target to control periodontal inflammation.
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21
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Trindade F, Amado F, Oliveira-Silva RP, Daniel-da-Silva AL, Ferreira R, Klein J, Faria-Almeida R, Gomes PS, Vitorino R. Toward the definition of a peptidome signature and protease profile in chronic periodontitis. Proteomics Clin Appl 2015; 9:917-27. [PMID: 25669956 DOI: 10.1002/prca.201400191] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2014] [Revised: 01/17/2015] [Accepted: 02/04/2015] [Indexed: 11/07/2022]
Abstract
PURPOSE Chronic periodontitis (CP) is a complex immuno-inflammatory disease that results from preestablished gingivitis. We investigated potential differences in salivary peptidome in health and CP. EXPERIMENTAL DESIGN Saliva was collected from nine CP patients and ten healthy subjects, from which five CP and five healthy were enriched following endoProteoFASP approach, separated and identified by nanoHPLC-MALDI-TOF/TOF. Protease prediction was carried out in silico with Proteasix. Parallel gelatin and collagen (I) zymographies were performed to study proteolytic activity in CP. RESULTS An association of CP with increased gelatinolytic and collagenolytic activity was observed, which is mainly attributed to metalloproteases, remarkably MMP9. Protease prediction revealed distinct protease profiles in CP and in health. Peptidomic data corroborated the inflammatory status, and demonstrated that intact histatin 1 may play an important role in the defense response against oral pathogens. The application of the endoProteoFASP approach to study the salivary peptidome of CP subjects resulted in the identification of eight surrogate peptide markers, which may be used in multiplex to identify CP. These peptides belong to acidic PRP and to P-B peptide. Particularly, P-B peptide fragments exhibited domains with potential predicted antimicrobial activity, corroborating an antimicrobial function. CONCLUSIONS AND CLINICAL RELEVANCE The comparison between the salivary peptidome obtained by control and CP samples showed a specific association of eight peptides to CP, with remarkable predicted antimicrobial activity, which should be further validated in studies with large number of subjects.
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Affiliation(s)
- Fábio Trindade
- QOPNA, Mass spectrometry center, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Francisco Amado
- QOPNA, Mass spectrometry center, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Rui P Oliveira-Silva
- QOPNA, Mass spectrometry center, Department of Chemistry, University of Aveiro, Aveiro, Portugal.,CICECO, Department of Chemistry, Aveiro Institute of Nanotechnology, University of Aveiro, Aveiro, Portugal
| | - Ana L Daniel-da-Silva
- CICECO, Department of Chemistry, Aveiro Institute of Nanotechnology, University of Aveiro, Aveiro, Portugal
| | - Rita Ferreira
- QOPNA, Mass spectrometry center, Department of Chemistry, University of Aveiro, Aveiro, Portugal
| | - Julie Klein
- Mosaiques-Diagnostics GmbH, Hannover, Germany
| | | | - Pedro S Gomes
- Laboratory for Bone Metabolism and Regeneration-Faculty of Dental Medicine, University of Porto, Porto, Portugal.,MedInUP-Center for Drug Discovery and Innovative Medicines, University of Porto, Porto, Portugal
| | - Rui Vitorino
- QOPNA, Mass spectrometry center, Department of Chemistry, University of Aveiro, Aveiro, Portugal.,iBiMED, Institute for Research in Biomedicine, University of Aveiro, Portugal
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22
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Sahingur SE, Yeudall WA. Chemokine function in periodontal disease and oral cavity cancer. Front Immunol 2015; 6:214. [PMID: 25999952 PMCID: PMC4419853 DOI: 10.3389/fimmu.2015.00214] [Citation(s) in RCA: 86] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2015] [Accepted: 04/18/2015] [Indexed: 12/12/2022] Open
Abstract
The chemotactic cytokines, or chemokines, comprise a superfamily of polypeptides with a wide range of activities that include recruitment of immune cells to sites of infection and inflammation, as well as stimulation of cell proliferation. As such, they function as antimicrobial molecules and play a central role in host defenses against pathogen challenge. However, their ability to recruit leukocytes and potentiate or prolong the inflammatory response may have profound implications for the progression of oral diseases such as chronic periodontitis, where tissue destruction may be widespread. Moreover, it is increasingly recognized that chronic inflammation is a key component of tumor progression. Interaction between cancer cells and their microenvironment is mediated in large part by secreted factors such as chemokines, and serves to enhance the malignant phenotype in oral and other cancers. In this article, we will outline the biological and biochemical mechanisms of chemokine action in host–microbiome interactions in periodontal disease and in oral cancer, and how these may overlap and contribute to pathogenesis.
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Affiliation(s)
- Sinem Esra Sahingur
- Department of Periodontics, Virginia Commonwealth University , Richmond, VA , USA ; Department of Microbiology and Immunology, Virginia Commonwealth University , Richmond, VA , USA
| | - W Andrew Yeudall
- Department of Oral and Craniofacial Molecular Biology, Virginia Commonwealth University , Richmond, VA , USA ; Department of Biochemistry and Molecular Biology, Virginia Commonwealth University , Richmond, VA , USA ; Massey Cancer Center, Virginia Commonwealth University , Richmond, VA , USA
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Maheaswari R, Sivasankar K, Subbarayan S. Toll gates: An emerging therapeutic target. J Indian Soc Periodontol 2015; 18:686-92. [PMID: 25624622 PMCID: PMC4296450 DOI: 10.4103/0972-124x.147398] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2013] [Accepted: 01/09/2014] [Indexed: 01/07/2023] Open
Abstract
Innate immune system forms the first line of defense against microbial infections, as it exerts an immediate response. Innate immunity works through Toll-like receptors (TLRs) which functions as primary sensors of pathogens. TLR activates multiple signaling cascades leading to the induction of genes responsible for the release of inflammatory cytokines and type I interferon. Thus, they induce antimicrobial responses and also have an instructive role in adaptive immunity. However, TLR-mediated inflammation is said to be responsible for many of the destructive host responses in inflammatory diseases like periodontitis. Hence, therapeutics targeting TLRs are being used to treat disease such as HIV, Hepatitis B, asthma etc. Recently, synthetic TLR agonists are tried as novel vaccine adjuvant in treating periodontal diseases. This paper reviews the scope of TLR-based therapeutics in treating periodontitis.
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Affiliation(s)
- Rajendran Maheaswari
- Department of Periodontics, Tamil Nadu Government Dental College and Hospital, Affiliated to Tamil Nadu Dr. MGR Medical University, Chennai, Tamil Nadu, India
| | - Kiruthika Sivasankar
- Consultant Periodontist, Apollo White Dental, T. Nagar, Chennai, Tamil Nadu, India
| | - Sathya Subbarayan
- Department of Periodontics, Tamil Nadu Government Dental College and Hospital, Affiliated to Tamil Nadu Dr. MGR Medical University, Chennai, Tamil Nadu, India
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Ashok N, Warad S, Kalburgi NB, Bilichodmath S, Prabhakaran PSV, Tarakji B. Toll-like receptor 9 gene polymorphism in chronic and aggressive periodontitis patients. J Indian Soc Periodontol 2015; 18:723-7. [PMID: 25624628 PMCID: PMC4296456 DOI: 10.4103/0972-124x.147407] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2013] [Accepted: 03/22/2014] [Indexed: 11/04/2022] Open
Abstract
AIM Periodontitis is a multifactorial disease, with microbial dental plaque as the primary etiological factor. However, the manifestation and progression of periodontitis is influenced by a wide variety of other determinants and factors such as social and behavioral factors, systemic factors, microbial composition of dental plaque, genetic, and many other emerging risk factors. The aim of this study was to analyze genetic polymorphisms in the toll-like receptor 9 (TLR9) gene at - 1237C/T and its association with chronic and generalized aggressive periodontitis (GAgP) in an Indian population. MATERIALS AND METHODS This study was carried out on 90 subjects, which included 30 GAgP and 30 chronic periodontitis patients and 30 healthy controls. Within the limitations of our study, only 30 subjects were included in each group due to the low prevalence of GAgP patients. Blood samples were drawn from the subjects and analyzed for TLR9 genetic polymorphism at - 1237C/T by using polymerase chain reaction-restriction fragment length polymorphism method. RESULTS No significant difference was found in genotype and allele frequency of TLR9 genetic polymorphism (- 1237C/T) in generalized aggressive and chronic periodontitis patients and healthy controls. CONCLUSION Toll-like receptor 9 genetic polymorphism at - 1237C/T may not be associated with GAgP and chronic periodontitis patients in Indian population.
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Affiliation(s)
- Nipun Ashok
- Department of Periodontics, Alfarabi College of Dentistry, Riyadh, Saudi Arabia
| | - Shivaraj Warad
- Department of Oral and Maxillofacial Sciences, P.M.N.M Dental College and Hospital, Bagalkot, India
| | | | - Shivaprasad Bilichodmath
- Department of Oral and Maxillofacial Sciences, Rajarajeshwari Dental College and Hospital, Bengaluru, Karnataka, India
| | | | - Bassel Tarakji
- Department of Oral and Maxillofacial Sciences, Alfarabi College of Dentistry, Riyadh, Saudi Arabia
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Trindade F, Oppenheim FG, Helmerhorst EJ, Amado F, Gomes PS, Vitorino R. Uncovering the molecular networks in periodontitis. Proteomics Clin Appl 2014; 8:748-61. [PMID: 24828325 DOI: 10.1002/prca.201400028] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Revised: 04/16/2014] [Accepted: 05/09/2014] [Indexed: 12/12/2022]
Abstract
Periodontitis is a complex immune-inflammatory disease that results from a preestablished infection in gingiva, mainly due to Gram-negative bacteria that colonize deeper in gingival sulcus and latter periodontal pocket. Host inflammatory and immune responses have both protective and destructive roles. Although cytokines, prostaglandins, and proteases struggle against microbial burden, these molecules promote connective tissue loss and alveolar bone resorption, leading to several histopathological changes, namely destruction of periodontal ligament, deepening of periodontal pocket, and bone loss, which can converge to attain tooth loss. Despite the efforts of genomics, transcriptomics, proteomics/peptidomics, and metabolomics, there is no available biomarker for periodontitis diagnosis, prognosis, and treatment evaluation, which could assist on the established clinical evaluation. Nevertheless, some genes, transcripts, proteins and metabolites have already shown a different expression in healthy subjects and in patients. Though, so far, 'omics approaches only disclosed the host inflammatory response as a consequence of microbial invasion in periodontitis and the diagnosis in periodontitis still relies on clinical parameters, thus a molecular tool for assessing periodontitis lacks in current dental medicine paradigm. Saliva and gingival crevicular fluid have been attracting researchers due to their diagnostic potential, ease, and noninvasive nature of collection. Each one of these fluids has some advantages and disadvantages that are discussed in this review.
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Affiliation(s)
- Fábio Trindade
- QOPNA, Mass Spectrometry Center, Department of Chemistry, University of Aveiro, Portugal
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Ghaderi H, Kiany F, Razmkhah M, Dadras S, Chenari N, Hosseini A, Younesi V, Ghaderi A. mRNA expression of pattern recognition receptors and their signaling mediators in healthy and diseased gingival tissues. J Indian Soc Periodontol 2014; 18:150-4. [PMID: 24872620 PMCID: PMC4033878 DOI: 10.4103/0972-124x.131309] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2013] [Accepted: 10/07/2013] [Indexed: 01/19/2023] Open
Abstract
Background: Gingivitis and periodontitis are initiated by inflammation caused by microorganisms. Pathogen-associated molecular patterns (PAMPs) from these microorganisms are recognized through various toll-like receptors (TLRs) and NOD-like receptors (NLRs). In this study, we have chosen five TLRs and two NLRs as representatives taking part in the recognition and inflammation process, along with a few of their signaling mediators including CD14, MYD88, and TRIF to compare their mRNA expression levels between healthy and diseased gingival tissues. This will provide deeper insight into the mechanisms underlying gingivitis and periodontitis. Understanding the mechanisms involved in the onset and progression of the periodontal diseases could greatly help in establishing effective ways for prevention and treatment of these diseases besides decreasing the risk factor for relevant systemic disorders. Materials and Methods: Gingival tissue samples for mRNA extraction and cDNA synthesis were taken from patients with gingivitis and periodontitis and from healthy control subjects. Messenger RNA expression of all genes was assessed using real-time polymerase chain reaction (PCR). Results: Among the genes studied in different groups, only MYD88 mRNA expression was significantly higher in the periodontitis group compared to that of the controls. The expression level of this molecule was also significantly higher in patients with severe periodontitis compared to other patients and also compared to healthy individuals. In different tissues, positive significant correlations were observed between the mRNA expression levels of some genes. Conclusions: Elevated mRNA levels of MYD88 in periodontitis might have a key role in the pathogenesis of this disease. Therefore, MYD88 may be a useful target for the therapy of this disease.
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Affiliation(s)
- Hamid Ghaderi
- Shiraz Institute for Cancer Research, Shiraz University of Medical Sciences, Shiraz, Iran ; Department of Periodontology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Farin Kiany
- Department of Periodontology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Mahboobeh Razmkhah
- Shiraz Institute for Cancer Research, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Somayeh Dadras
- Shiraz Institute for Cancer Research, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Noushafarin Chenari
- Shiraz Institute for Cancer Research, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Ahmad Hosseini
- Shiraz Institute for Cancer Research, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Vahid Younesi
- Department of Immunology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
| | - Abbas Ghaderi
- Shiraz Institute for Cancer Research, Shiraz University of Medical Sciences, Shiraz, Iran ; Department of Immunology, School of Medicine, Shiraz University of Medical Sciences, Shiraz, Iran
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Zhang Y, Li X. Lipopolysaccharide-regulated production of bone sialoprotein and interleukin-8 in human periodontal ligament fibroblasts: the role of toll-like receptors 2 and 4 and the MAPK pathway. J Periodontal Res 2014; 50:141-51. [PMID: 24854880 DOI: 10.1111/jre.12193] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/26/2014] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND OBJECTIVE Lipopolysaccharide (LPS) on the cell wall of periodontal pathogens is a major mediator of the inflammatory response and can enhance alveolar bone resorption in periodontitis. Bone sialoprotein is an early marker of osteoblast differentiation. The proinflammatory cytokine, interleukin-8 (IL-8), induces osteoclast differentiation, maturation and maintenance of bone resorption activity. However, the effects of LPS from periodontal pathogens on the expression of bone sialoprotein and IL-8 in human osteoblasts and the mechanism of periodontal bone metabolism regulation are rather unclear. The objectives of this study were to determine the effects of Porphyromonas gingivalis LPS on the production of bone sialoprotein and IL-8 in human periodontal ligament fibroblasts (hPDLFs), and to investigate whether toll-like receptor (TLR) 2, TLR4 and MAPKs pathways are involved in the regulation of production of bone sialoprotein and IL-8 by P. gingivalis LPS. MATERIAL AND METHODS The third-generation of hPDLFs were cultured with mineralization-inducing culture medium. After hPDLFs were treated with P. gingivalis LPS, bone sialoprotein and IL-8 mRNA expression were detected using Real time PCR. Then hPDLFs were transiently transfected with siTLR2 or siTLR4 (20 nm) or inhibited by MAPK signaling pathways inhibitors, and then bone sialoprotein and IL-8 mRNA and protein expression were also detected using Real time PCR and western blotting. RESULTS Treatments with 0.01 and 0.1 mg/L of P. gingivalis LPS for 8 h up-regulated bone sialoprotein mRNA expression, whereas 10 and 100 mg/L of P. gingivalis LPS induced a significant decrease in the expression of bone sialoprotein mRNA. In contrast, IL8 mRNA levels were increased significantly by 10 mg/L of P. gingivalis LPS. Interestingly, small interfering RNA (siRNA) knock down of the TLR2 and ERK1/2 inhibitor, PD98059, abolished the effects of P. gingivalis LPS on the bone sialoprotein mRNA level, whereas siRNA knock down of the TLR2 and p38 MAPK inhibitor, SB203580, blocked the effect of P. gingivalis LPS on IL-8 in hPDLFs. CONCLUSION This study suggests that in hPDLFs, P. gingivalis LPS suppresses bone sialoprotein and enhances IL-8 gene and protein expression via TLR2 and ERK1/2 or the p38 MAPK signaling pathway, respectively.
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Affiliation(s)
- Y Zhang
- Department of Periodontology, Tianjin Stomatological Hospital, Tianjin, China
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28
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Huang N, Gibson FC. Immuno-pathogenesis of Periodontal Disease: Current and Emerging Paradigms. ACTA ACUST UNITED AC 2014; 1:124-132. [PMID: 24839590 DOI: 10.1007/s40496-014-0017-8] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Periodontal disease (PD) is a highly complex disease involving many factors; however, two principal facets central to initiation and progression of the majority of PD are the composition of the microbes in the sub-gingival plaque, and the host immune response to these organisms. Numerous studies point to the complexity of PD, and to the fact that despite innate and adaptive immune activation, and resultant inflammation, our immune response fails to cure disease. Stunning new findings have begun to clarify several complexities of the host-pathogen interaction of PD pointing to key roles for microbial dysboisis and immune imbalance in the pathogenesis of disease. Furthermore, these investigations have identified novel translational opportunities to intercede in PD treatment. In this review we will highlight a select few recent findings in innate and adaptive immunity, and host pathogen interactions of PD at a micro-environmental level that may have profound impact on PD progression.
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Affiliation(s)
- Nasi Huang
- Section of Infectious Diseases, Department of Medicine, Boston University School of Medicine, Boston, MA, 02118
| | - Frank C Gibson
- Section of Infectious Diseases, Department of Medicine, Boston University School of Medicine, Boston, MA, 02118
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Zhan Y, Zhang R, Lv H, Song X, Xu X, Chai L, Lv W, Shang Z, Jiang Y, Zhang R. Prioritization of candidate genes for periodontitis using multiple computational tools. J Periodontol 2014; 85:1059-69. [PMID: 24476546 DOI: 10.1902/jop.2014.130523] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
BACKGROUND Both genetic and environmental factors contribute to the development of periodontitis. Genetic studies identified a variety of candidate genes for periodontitis. The aim of the present study is to identify the most promising candidate genes for periodontitis using an integrative gene ranking method. METHODS Seed genes that were confirmed to be associated with periodontitis were identified using text mining. Three types of candidate genes were then extracted from different resources (expression profiles, genome-wide association studies). Combining the seed genes, four freely available bioinformatics tools (ToppGene, DIR, Endeavour, and GPEC) were integrated for prioritization of candidate genes. Candidate genes that identified with at least three programs and ranked in the top 20 by each program were considered the most promising. RESULTS Prioritization analysis resulted in 21 promising genes involved or potentially involved in periodontitis. Among them, IL18 (interleukin 18), CD44 (CD44 molecule), CXCL1 (chemokine [CXC motif] ligand 1), IL6ST (interleukin 6 signal transducer), MMP3 (matrix metallopeptidase 3), MMP7, CCR1 (chemokine [C-C motif] receptor 1), MMP13, and TLR9 (Toll-like receptor 9) had been associated with periodontitis. However, the roles of other genes, such as CSF3 (colony stimulating factor 3 receptor), CD40, TNFSF14 (tumor necrosis factor receptor superfamily, member 14), IFNB1 (interferon-β1), TIRAP (toll-interleukin 1 receptor domain containing adaptor protein), IL2RA (interleukin 2 receptor α), ETS1 (v-ets avian erythroblastosis virus E26 oncogene homolog 1), GADD45B (growth arrest and DNA-damage-inducible 45 β), BIRC3 (baculoviral IAP repeat containing 3), VAV1 (vav 1 guanine nucleotide exchange factor), COL5A1 (collagen, type V, α1), and C3 (complement component 3), have not been investigated thoroughly in the process of periodontitis. These genes are mainly involved in bacterial infection, immune response, and inflammatory reaction, suggesting that further characterizing their roles in periodontitis will be important. CONCLUSIONS A combination of computational tools will be useful in mining candidate genes for periodontitis. These theoretical results provide new clues for experimental biologists to plan targeted experiments.
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Affiliation(s)
- Yuanbo Zhan
- Department of Periodontology and Oral Mucosa, Second Affiliated Hospital of Harbin Medical University, Harbin, China
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30
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Fatemi K, Radvar M, Rezaee A, Rafatpanah H, Azangoo khiavi H, Dadpour Y, Radvar N. Comparison of relative TLR-2 and TLR-4 expression level of disease and healthy gingival tissue of smoking and non-smoking patients and periodontally healthy control patients. Aust Dent J 2013; 58:315-20. [PMID: 23981212 DOI: 10.1111/adj.12089] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2012] [Revised: 10/25/2012] [Accepted: 11/26/2012] [Indexed: 11/26/2022]
Abstract
BACKGROUND Toll-like receptors are a family of sensor proteins that induce the inflammatory diseases in context of microbial infection. The role of these proteins in periodontal disease and their interaction with smoking status are yet to be investigated. The aim of the present study was to evaluate the effect of smoking on gene expression of toll like receptor 2 (TLR-2) and toll-like receptor 4 (TLR-4) in patients with periodontitis. METHODS RNAs were extracted from gingival biopsies of healthy sites (no bleeding on probing and pocket depth ≤3 mm) as well as diseased sites (with bleeding on probing and pocket depth ≥5 mm) of 20 smoker and 17 non-smoker subjects with chronic periodontitis. Gingival biopsies from eight periodontally healthy, never-smoker subjects served as control. Real-time PCR was carried out to evaluate the relative quantities of TLR-2 and TLR-4 mRNA concentrations. RESULTS Regardless of smoking status, the relative expression levels of TLR-2 and TLR-4 were significantly greater (about 3 fold) at diseased sites compared to healthy sites of patients with periodontitis and healthy controls (p < 0.05). In sites with periodontitis, smoking caused an increase of about 6.5 fold in mRNA levels of TLR-4 in gingival tissue (p < 0.05). CONCLUSIONS Although periodontitis might significantly increase TLR-2 and TLR-4 gene expression in gingival tissues, smoking habit in periodontitis subjects could selectively potentiate TLR-4 gene expression.
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Affiliation(s)
- K Fatemi
- Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
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31
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Promsudthi A, Poomsawat S, Limsricharoen W. The role of Toll-like receptor 2 and 4 in gingival tissues of chronic periodontitis subjects with type 2 diabetes. J Periodontal Res 2013; 49:346-54. [PMID: 23844856 DOI: 10.1111/jre.12112] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 05/10/2013] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND OBJECTIVE Diabetes is one important risk factor of chronic periodontitis. However, the roles of toll-like receptor (TLR) 2 and TLR4, which are implicated in the inflammatory process in both chronic periodontitis and diabetes, have not been studied. This study aimed to determine whether TLR2 and TLR4 might be involved in the relationship between chronic periodontitis and diabetes by examining TLR2 and TLR4 expression in gingival tissues from subjects with chronic periodontitis without diabetes (CP) and with diabetes (CP+DM) and from periodontally healthy subjects without diabetes (PH) and with diabetes (PH+DM). MATERIAL AND METHODS Gingival tissues were collected from 23 CP subjects, 21 CP+DM subjects, 22 PH subjects and 20 PH+DM subjects. The expression of TLR2 and TLR4 in gingival tissues was determined using an immunohistochemical method. In gingival epithelium, staining patterns and intensity levels of TLR2 and TLR4 expression were studied. In connective tissues, the percentages of TLR2- and TLR4-positive cells were calculated. The intensity levels and the percentages of positive cells were statistically analyzed. RESULTS Chronic periodontitis or diabetes showed no significant effect on TLR2 expression in the oral epithelium. However, diabetes increased the expression of TLR2 in sulcular epithelium and changed the pattern of TLR2 expression in gingival epithelium. Chronic periodontitis decreased the expression of TLR4 in gingival epithelium. In connective tissue under sulcular epithelium, CP+DM subjects showed statistically significant higher percentages of TLR2- and TLR4-positive cells compared with PH and PH+DM subjects. CONCLUSION Our results suggest that hyperglycemia and chronic periodontitis had effects on TLR2 and TLR4 expression in gingival tissue. The differences in TLR2 and TLR4 expression could contribute to a greater inflammatory response, leading to periodontal disease initiation and progression.
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Affiliation(s)
- A Promsudthi
- Department of Oral Medicine and Periodontology, Faculty of Dentistry, Mahidol University, Bangkok, Thailand
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Wara-aswapati N, Chayasadom A, Surarit R, Pitiphat W, Boch JA, Nagasawa T, Ishikawa I, Izumi Y. Induction of Toll-Like Receptor Expression by Porphyromonas gingivalis. J Periodontol 2013; 84:1010-8. [DOI: 10.1902/jop.2012.120362] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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Hypermethylation and low transcription of TLR2 gene in chronic periodontitis. Hum Immunol 2013; 74:1231-6. [PMID: 23747679 DOI: 10.1016/j.humimm.2013.04.037] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2013] [Revised: 02/06/2013] [Accepted: 04/23/2013] [Indexed: 11/20/2022]
Abstract
Periodontitis is an inflammatory disorder characterized by interactions between periodontal pathogens and host's immune response. Epigenetic may contribute to disease development and outcome by influencing the expression of genes involved in the immune response. It has been shown that Toll-like receptors (TLR) play an important role in the response to periodontopathic bacteria. The aim of study was to evaluate the methylation status and the expression of TLR2 gene in gingival samples from individuals with and without periodontitis. DNA was analyzed using the Methyl Profiler DNA Methylation qPCR assay. DNA methylation and transcript levels were evaluated by real-time polymerase chain reaction. The periodontitis group showed a hypermethylated profile and a low expression of gene. Positive correlation between the TLR2 methylation frequency and probing depth was observed. This study gives the first evidence of methylation frequency in inflamed periodontal tissues and of the possible participation of methylation in the development of periodontitis.
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Sahingur SE, Xia XJ, Voth SC, Yeudall WA, Gunsolley JC. Increased nucleic Acid receptor expression in chronic periodontitis. J Periodontol 2013; 84:e48-57. [PMID: 23646855 DOI: 10.1902/jop.2013.120739] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
BACKGROUND Nucleic acid sensing has emerged as one of the important components of the immune system triggering inflammation. The aim of this study is to determine the expression of bacterial DNA sensors, including Toll-like receptor 9 (TLR-9), DNA-dependent activator of interferon-regulatory factors (DAI), and absent in melanoma 2 (AIM2) in chronic periodontitis (CP versus healthy) (H) tissues. METHODS Thirty-five CP and 27 H gingival biopsies were included. Real-time quantitative polymerase chain reaction was performed to determine mRNA levels of AIM2, DAI, and TLRs (TLR-1 through TLR-9). The difference in gene expression for each sensor between CP and H tissues was calculated using analysis of covariance. The Spearman test was used to determine correlations among innate receptors. The expression of TLR-9, AIM2, and DAI in gingival tissues was further confirmed using immunohistochemistry. RESULTS The present results reveal statistically significant upregulation of TLR-9 (P <0.006), DAI (P <0.001), and TLR-8 (P <0.01) in CP tissues compared to H sites. Although mRNA expression was not changed significantly between groups for other receptors, the present results reveal significant correlations between receptors (P <0.05), suggesting that cooperation between multiple components of the host immune system may influence the overall response. Immunohistochemistry further confirmed expression of TLR-9, AIM2, and DAI in gingival tissues. CONCLUSIONS This study highlights a possible role for nucleic acid receptors in periodontal inflammation. Future investigations will determine whether cytoplasmic receptors and their ligands can be targeted to improve clinical outcomes in periodontitis.
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Affiliation(s)
- S Esra Sahingur
- Department of Periodontics, School of Dentistry, Virginia Commonwealth University, Richmond, VA
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35
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Tanaka MH, Giro EMA, Cavalcante LB, Pires JR, Apponi LH, Valentini SR, Spolidório DMP, Capela MV, Rossa C, Scarel-Caminaga RM. Expression of interferon-γ, interferon-α and related genes in individuals with Down syndrome and periodontitis. Cytokine 2012; 60:875-81. [PMID: 22995210 DOI: 10.1016/j.cyto.2012.08.020] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 08/18/2012] [Accepted: 08/18/2012] [Indexed: 11/21/2022]
Abstract
BACKGROUND Recently, attenuation of anti-inflammatory and increase of pro-inflammatory mediators was demonstrated in individuals with Down syndrome (DS) in comparison with euploid patients during periodontal disease (PD), suggesting a shift to a more aggressive inflammation in DS. AIM To determine the influence of DS in the modulation of interferons (IFNs) signaling pathway in PD. MATERIALS AND METHODS Clinical periodontal assessment was performed and gingival tissue samples obtained from a total of 51 subjects, including 19 DS individuals with PD, 20 euploid individuals with PD and 12 euploid individuals without PD. Expression levels of interferon-gamma (IFNG) and interferon-alpha (IFNA), and their receptors IFNGR1, IFNGR2, IFNAR1 and IFNAR2, the signaling intermediates Janus kinase 1 (JAK1), signal transducer and activator of transcription 1 (STAT1) and interferon regulatory factor 1 (IRF1) were determined using real time quantitative polymerase chain reaction (qPCR). RESULTS Clinical signs of periodontal disease were markedly more severe in DS and euploid patients with PD in comparison to euploid and periodontally healthy patients. There was no difference on mRNA levels of IFNA, IFNG, INFGR2, IFNAR1 and IFNAR2 between DS and euploid individuals, even though some of these genes are located on chromosome 21. STAT1 and IRF1 mRNA levels were significantly lower in DS patients in comparison with euploid individuals with PD. In euploid individuals, PD was associated with an increased expression of IFNGR1, IFNGR2, IFNAR1, STAT1 and IRF1. CONCLUSIONS Reduced expression of STAT1 and IRF1 genes indicate an impaired activation of IFNs signaling in individuals with DS and PD. Expression of IFNA, IFNG and IFN receptors was not altered in DS patients, indicating that indirect mechanisms are involved in the reduced activation of IFN signaling.
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Affiliation(s)
- Marcia H Tanaka
- Department of Orthodontics and Pediatric Dentistry, School of Dentistry at Araraquara, UNESP - Univ. Estadual Paulista, São Paulo, Brazil
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Jiang SY, Wei CC, Shang TT, Lian Q, Wu CX, Deng JY. High glucose induces inflammatory cytokine through protein kinase C-induced toll-like receptor 2 pathway in gingival fibroblasts. Biochem Biophys Res Commun 2012; 427:666-70. [PMID: 23026048 DOI: 10.1016/j.bbrc.2012.09.118] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2012] [Accepted: 09/21/2012] [Indexed: 01/04/2023]
Abstract
Toll-like receptors (TLRs) play a key role in innate immune response and inflammation, especially in periodontitis. Meanwhile, hyperglycemia can induce inflammation in diabetes complications. However, the activity of TLRs in periodontitis complicated with hyperglycemia is still unclear. In the present study, high glucose (25 mmol/l) significantly induced TLR2 expression in gingival fibroblasts (p<0.05). Also, high glucose increased nuclear factor kappa B (NF-κB) p65 nuclear activity, tumor necrosis factor-α (TNF-α) and interleukin-lβ (IL-1β) levels. Protein kinase C (PKC)-α and δ knockdown with siRNA significantly decreased TLR2 and NF-κB p65 expression (p<0.05), whereas inhibition of PKC-β had no effect on TLR2 and NF-κB p65 under high glucose (p<0.05). Additional studies revealed that TLR2 knockdown significantly abrogated high-glucose-induced NF-κB expression and inflammatory cytokine secretion. Collectively, these data suggest that high glucose stimulates TNF-α and IL-1β secretion via inducing TLR2 through PKC-α and PKC-δ in human gingival fibroblasts.
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Affiliation(s)
- Shao-Yun Jiang
- School of Dentistry, Tianjin Medical University, 12 Qi Xiang Tai Street, Heping District, Tianjin 300070, China.
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Sahingur SE, Xia XJ, Schifferle RE. Oral Bacterial DNA Differ in Their Ability to Induce Inflammatory Responses in Human Monocytic Cell Lines. J Periodontol 2012; 83:1069-77. [DOI: 10.1902/jop.2011.110522] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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MAPK usage in periodontal disease progression. JOURNAL OF SIGNAL TRANSDUCTION 2012; 2012:308943. [PMID: 22315682 PMCID: PMC3270463 DOI: 10.1155/2012/308943] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/15/2011] [Accepted: 10/05/2011] [Indexed: 12/12/2022]
Abstract
In periodontal disease, host recognition of bacterial constituents, including lipopolysaccharide (LPS), induces p38 MAPK activation and subsequent inflammatory cytokine expression, favoring osteoclastogenesis and increased net bone resorption in the local periodontal environment. In this paper, we discuss evidence that the p38/MAPK-activated protein kinase-2 (MK2) signaling axis is needed for periodontal disease progression: an orally administered p38α inhibitor reduced the progression of experimental periodontal bone loss by reducing inflammation and cytokine expression. Subsequently, the significance of p38 signaling was confirmed with RNA interference to attenuate MK2-reduced cytokine expression and LPS-induced alveolar bone loss. MAPK phosphatase-1 (MKP-1), a negative regulator of MAPK activation, was also critical for periodontal disease progression. In MPK-1-deficient mice, p38-sustained activation increased osteoclast formation and bone loss, whereas MKP-1 overexpression dampened p38 signaling and subsequent cytokine expression. Finally, overexpression of the p38/MK2 target RNA-binding tristetraprolin (TTP) decreased mRNA stability of key inflammatory cytokines at the posttranscriptional level, thereby protecting against periodontal inflammation. Collectively, these studies highlight the importance of p38 MAPK signaling in immune cytokine production and periodontal disease progression.
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De Oliveira NFP, Andia DC, Planello AC, Pasetto S, Marques MR, Nociti FH, Line SRP, De Souza AP. TLR2 and TLR4 gene promoter methylation status during chronic periodontitis. J Clin Periodontol 2011; 38:975-83. [PMID: 21899586 DOI: 10.1111/j.1600-051x.2011.01765.x] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
AIM The objective of this study was to analyse the status of DNA methylation in the promoter region of the toll-like receptor (TLR)2 and TLR4 genes in gingival tissue samples from healthy subjects, smokers and non-smokers affected by chronic periodontitis. MATERIAL AND METHODS Genomic DNA and total RNA were purified from gingival tissue using the TRIZOL reagent protocol. Genomic DNA was then digested by methylation-sensitive restriction enzymes, amplified by polymerase chain reaction (PCR), electrophoresed on a 10% polyacrylamide gel and stained using SYBR Gold. Real-time PCR was also performed to verify the transcript levels. RESULTS The CpG dinucleotides analysed were observed to be unmethylated in the majority of DNA samples of the three groups and statistical differences were not found among groups (p>0.05). However, a trend towards methylation was observed in the TLR2 HhaI site in the samples of the periodontitis non-smoker groups. In fact, the analysis of all CpG sites together shows which complete methylation is observed in the shortest level in the samples of periodontitis non-smoker group. The analysis of transcript levels demonstrated no difference among groups (p>0.05). CONCLUSION The results demonstrated major unmethylation of the TLR4 gene promoter in all groups. However, the results for the TLR2 gene promoter are inconclusive; this gene was found as a mosaic of methylated and unmethylated DNA in the majority of samples of the three groups and we also observed a trend towards the DNA methylation of CpG sites recognized by the HhaI enzyme.
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Affiliation(s)
- Naila Francis Paulo De Oliveira
- Department of Morphology, Laboratory of Molecular Biology, Division of Histology, Piracicaba Dental School, University of Campinas-UNICAMP, Piracicaba, São Paulo, SP, Brazil
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Cathelicidins—Therapeutic antimicrobial and antitumor host defense peptides for oral diseases. JAPANESE DENTAL SCIENCE REVIEW 2011. [DOI: 10.1016/j.jdsr.2010.11.001] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
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Sahingur SE, Xia XJ, Gunsolley J, Schenkein HA, Genco RJ, De Nardin E. Single nucleotide polymorphisms of pattern recognition receptors and chronic periodontitis. J Periodontal Res 2010; 46:184-92. [PMID: 21118416 DOI: 10.1111/j.1600-0765.2010.01327.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
BACKGROUND AND OBJECTIVE Periodontitis is a multifactorial disease influenced partly by genetics. Activation of pattern recognition receptors (PRRs) can lead to the up-regulation of inflammatory pathways, resulting in periodontal tissue destruction. Hence, functional polymorphisms located in PRRs can explain differences in host susceptibility to periodontitis. This study investigated single nucleotide polymorphisms of PRRs including toll-like receptor (TLR)2 (G2408A), TLR4 (A896G), TLR9 (T1486C), TLR9 (T1237C) and CD14 (C260T) in patients with chronic periodontitis and in periodontally healthy subjects. METHODS One-hundred and fourteen patients with chronic periodontitis and 77 periodontally healthy subjects were genotyped using TaqMan® allelic discrimination assays. Fisher's exact test and chi-square analyses were performed to compare genotype and allele frequencies. RESULTS The frequency of subjects with the CC genotype of CD14 (C260T) (24.6% in the chronic periodontitis group vs. 13% in the periodontally healthy group) and those expressing the T allele of CD14 (C260T) (CT and TT) (75.4% in the chronic periodontitis group vs. 87% in the periodontally healthy group) was statistically different among groups (p = 0.04). Homozygocity for the C allele of the CD14 (C260T) polymorphism (CC) was associated with a two--fold increased susceptibility to periodontitis (p = 0.04; odds ratio, 2.49; 95% confidence interval, 1.06-6.26). Individuals with the CC genotype of TLR9 (T1486C) (14.9% in the chronic periodontitis group vs. 28.6% in the periodontally healthy group) and those expressing the T allele of TLR9 (T1486C) (CT and TT) (85.1% in the chronic periodontitis group vs. 71.4% in the periodontally healthy group) were also significantly differently distributed between groups without adjustment (p = 0.03). Further analysis of nonsmokers revealed a significant difference in the distribution of genotypes between groups for TLR9 (T1486C; p = 0.017) and CD14 (C260T; p = 0.03), polymorphisms again without adjustment. CONCLUSION The CC genotype of CD14 (C260T) is related to susceptibility to chronic periodontitis in Caucasians. In addition, differences observed in the distribution of TLR9 (T1486C) genotypes between groups warrant further investigation.
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Affiliation(s)
- S E Sahingur
- Virginia Commonwealth University, School of Dentistry, Department of Periodontics, Richmond, VA 23298-0566, USA.
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Sahingur SE, Xia XJ, Alamgir S, Honma K, Sharma A, Schenkein HA. DNA from Porphyromonas gingivalis and Tannerella forsythia induce cytokine production in human monocytic cell lines. Mol Oral Microbiol 2010; 25:123-35. [PMID: 20331800 DOI: 10.1111/j.2041-1014.2009.00551.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
Toll-like receptor 9 (TLR9) expression is increased in periodontally diseased tissues compared with healthy sites indicating a possible role of TLR9 and its ligand, bacterial DNA (bDNA), in periodontal disease pathology. Here, we determine the immunostimulatory effects of periodontal bDNA in human monocytic cells (THP-1). THP-1 cells were stimulated with DNA of two putative periodontal pathogens: Porphyromonas gingivalis and Tannerella forsythia. The role of TLR9 in periodontal bDNA-initiated cytokine production was determined either by blocking TLR9 signaling in THP-1 cells with chloroquine or by measuring IL-8 production and nuclear factor-kappaB (NF-kappaB) activation in HEK293 cells stably transfected with human TLR9. Cytokine production (IL-1beta, IL-6, and TNF-alpha) was increased significantly in bDNA-stimulated cells compared with controls. Chloroquine treatment of THP-1 cells decreased cytokine production, suggesting that TLR9-mediated signaling pathways are operant in the recognition of DNA from periodontal pathogens. Compared with native HEK293 cells, TLR9-transfected cells demonstrated significantly increased IL-8 production (P < 0.001) and NF-kappaB activation in response to bDNA, further confirming the role of TLR9 in periodontal bDNA recognition. The results of PCR arrays demonstrated upregulation of proinflammatory cytokine and NF-kappaB genes in response to periodontal bDNA in THP-1 cells, suggesting that cytokine induction is through NF-kappaB activation. Hence, immune responses triggered by periodontal bacterial nucleic acids may contribute to periodontal disease pathology by inducing proinflammatory cytokine production through the TLR9 signaling pathway.
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Affiliation(s)
- S E Sahingur
- Virginia Commonwealth University, School of Dentistry, Department of Periodontics, Richmond, VA, USA.
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Ford PJ, Gamonal J, Seymour GJ. Immunological differences and similarities between chronic periodontitis and aggressive periodontitis. Periodontol 2000 2010; 53:111-23. [PMID: 20403108 DOI: 10.1111/j.1600-0757.2010.00349.x] [Citation(s) in RCA: 64] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Lima HR, Gelani V, Fernandes AP, Gasparoto TH, Torres SA, Santos CF, Garlet GP, da Silva JS, Campanelli AP. The essential role of toll like receptor-4 in the control of Aggregatibacter actinomycetemcomitans infection in mice. J Clin Periodontol 2010; 37:248-54. [PMID: 20149215 DOI: 10.1111/j.1600-051x.2009.01531.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVE Aggregatibacter actinomycetemcomitans is an oral Gram-negative bacterium that contributes to periodontitis progression. Isolated antigens from A. actinomycetemcomitans could be activating innate immune cells through Toll-like receptors (TLRs). In this study, we evaluated the role of TLR4 in the control of A. actinomycetemcomitans infection. MATERIAL AND METHODS We examined the mechanisms that modulate the outcome of A. actinomycetemcomitans-induced periodontal disease in TLR4(-/-) mice. The production of cytokines was evaluated by ELISA. The bacterial load was determined by counting the number of colony-forming units per gram of tissue. RESULTS The results showed that TLR4-deficient mice developed less severe periodontitis after A. actinomycetemcomitans infection, characterized by significantly lower bone loss and inflammatory cell migration to periodontal tissues. However, the absence of TLR4 facilitated the A. actinomycetemcomitans dissemination. Myeloperoxidase activity was diminished in the periodontal tissue of TLR4(-/-) mice. We observed a significant reduction in the production of tumour necrosis factor-alpha (TNF-alpha) and interleukin (IL)-1beta in the periodontal tissue of TLR4(-/-) mice. CONCLUSION The results of this study highlighted the role of TLR4 in controlling A. actinomycetemcomitans infection.
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Affiliation(s)
- Hayana Ramos Lima
- Department of Biological Sciences, Bauru School of Dentistry, University of São Paulo, Bauru, SP, Brazil
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Dorner M, Brandt S, Tinguely M, Zucol F, Bourquin JP, Zauner L, Berger C, Bernasconi M, Speck RF, Nadal D. Plasma cell toll-like receptor (TLR) expression differs from that of B cells, and plasma cell TLR triggering enhances immunoglobulin production. Immunology 2010; 128:573-9. [PMID: 19950420 DOI: 10.1111/j.1365-2567.2009.03143.x] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023] Open
Abstract
Toll-like receptors (TLRs) are key receptors of the innate immune system and show cell subset-specific expression. We investigated the messenger RNA (mRNA) expression of TLR genes in human haematopoietic stem cells (HSC), in naïve B cells, in memory B cells, in plasma cells from palatine tonsils and in plasma cells from peripheral blood. HSC and plasma cells showed unrestricted expression of TLR1-TLR9, in contrast to B cells which lacked TLR3, TLR4 and TLR8 but expressed mRNA of all other TLRs. We demonstrated, for the first time, that TLR triggering of terminally differentiated plasma cells augments immunoglobulin production. Thus, boosting the immediate antibody response by plasma cells upon pathogen recognition may point to a novel role of TLRs.
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Affiliation(s)
- Marcus Dorner
- Division of Infectious Diseases and Hospital Epidemiology, Children's Hospital of Zurich, Zurich, Switzerland
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Holla LI, Vokurka J, Hrdlickova B, Augustin P, Fassmann A. Association of Toll-like receptor 9 haplotypes with chronic periodontitis in Czech population. J Clin Periodontol 2010; 37:152-9. [DOI: 10.1111/j.1600-051x.2009.01523.x] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Abstract
Toll-like receptors (TLRs) are central mediators of innate antimicrobial and inflammatory responses and play instructive roles in the development of the adaptive immune response. Thus when stimulated by certain agonists, TLRs serve as adjuvant receptors that link innate and adaptive immunity. However, when excessively activated or inadequately controlled during an infection, TLRs may contribute to immunopathology associated with inflammatory diseases, such as periodontitis. Moreover, certain microbial pathogens appear to exploit aspects of TLR signalling in ways that enhance their adaptive fitness. The diverse and important roles played by TLRs suggest that therapeutic manipulation of TLR signalling may have implications in the control of infection, attenuation of inflammation, and the development of vaccine adjuvants for the treatment of periodontitis. Successful application of TLR-based therapeutic modalities in periodontitis would require highly selective and precisely targeted intervention. This would in turn necessitate precise characterization of TLR signalling pathways in response to periodontal pathogens, as well as development of effective and specific agonists or antagonists of TLR function and signalling. This review summarizes the current status of TLR biology as it relates to periodontitis, and evaluates the potential of TLR-based approaches for host-modulation therapy in this oral disease.
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Affiliation(s)
- George Hajishengallis
- Department of Periodontics/ Oral Health and Systemic Disease, School of Dentistry, University of Louisville Health Sciences Center, Louisville, KY 40292, USA
- Department of Immunology and Microbiology, School of Medicine, University of Louisville Health Sciences Center, Louisville, KY 40292, USA
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Diamond G, Beckloff N, Ryan LK. Host defense peptides in the oral cavity and the lung: similarities and differences. J Dent Res 2008; 87:915-27. [PMID: 18809744 DOI: 10.1177/154405910808701011] [Citation(s) in RCA: 118] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023] Open
Abstract
Peptides with broad-spectrum antimicrobial activity are found in the mucosal surfaces at many sites in the body, including the airway, the oral cavity, and the digestive tract. Based on their in vitro antimicrobial and other immunomodulatory activities, these host defense peptides have been proposed to play an important role in the innate defense against pathogenic microbial colonization. The genes that encode these peptides are up-regulated by pathogens, further supporting their role in innate immune defense. However, the differences in the local microbial environments between the generally sterile airway and the highly colonized oral cavity suggest a more complex role for these peptides in innate immunity. For example, beta-defensin genes are induced in the airway by all bacteria and Toll-like receptor (TLR) agonists primarily through an NF-kappaB-mediated pathway. In contrast, the same genes are induced in the gingival epithelium by only a subset of bacteria and TLR ligands, via different pathways. Furthermore, the environments into which the peptides are secreted--specifically saliva, gingival crevicular fluid, and airway surface fluid--differ greatly and can effect their respective activities in host defense. In this review, we examine the differences and similarities between host defense peptides in the oral cavity and the airway, to gain a better understanding of their contributions to immunity.
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Affiliation(s)
- G Diamond
- Department of Oral Biology, UMDNJ-New Jersey Dental School, 185 South Orange Ave., Newark 07103, NJ 07101, USA.
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