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Kabacaoğlu B, Öztürk Özener H. Evaluation of inflammasomes as biomarker following non-surgical periodontal treatment. Arch Oral Biol 2024; 164:105987. [PMID: 38723420 DOI: 10.1016/j.archoralbio.2024.105987] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2024] [Revised: 04/17/2024] [Accepted: 04/28/2024] [Indexed: 06/06/2024]
Abstract
OBJECTIVE The purpose of this study was to investigate interleukin (IL)-1β, IL-18, nod-like receptor pyrin domain-containing protein 3 (NLRP3), apoptosis-related speck-like protein containing a caspase activation and recruitment domain (ASC), and caspase-1 levels in saliva and serum in different periodontal diseases and to evaluate the changes after non-surgical periodontal treatment (NSPT). DESIGN A total of 45 participants, 15 healthy, 15 gingivitis, and 15 stage III grade C (SIIIGC) periodontitis patients, were included in the study. Periodontal parameters were assessed, and salivary and serum samples were collected at baseline in all groups and one and three months after NSPT in gingivitis and periodontitis groups. An enzyme-linked immunosorbent assay was used to analyse IL-1β, IL-18, NLRP3, ASC, and caspase-1 levels. RESULTS After NSPT, improvement was observed in all clinical parameters, along with periodontal inflamed surface area (PISA) in gingivitis and periodontitis groups. PISA scores were positively correlated with IL-1β, NLRP3, and caspase-1 at baseline (p < 0.05). Salivary and serum IL-1β, NLRP3 levels were higher in periodontitis compared to healthy controls at baseline and reduced after treatment (p < 0.05). Receiver operating characteristic analysis revealed that salivary IL-1β, NLRP3, and caspase-1 had the ability to discriminate SIIIGC periodontitis patients from healthy subjects (p < 0.05). CONCLUSION In conclusion, salivary IL-1β, NLRP3, and caspase-1 are at aberrantly high levels in SIIIGC periodontitis and are remarkably decreased following NSPT; these inflammasome biomarkers may show potential utility in diagnosing and monitoring periodontitis.
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Affiliation(s)
- Bilge Kabacaoğlu
- Department of Periodontology, Institute of Health Sciences, Marmara University, Istanbul, Turkiye
| | - Hafize Öztürk Özener
- Department of Periodontology, Faculty of Dentistry, Marmara University, Istanbul, Turkiye.
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2
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Didilescu AC, Chinthamani S, Scannapieco FA, Sharma A. NLRP3 inflammasome activity and periodontal disease pathogenesis-A bidirectional relationship. Oral Dis 2024. [PMID: 38817019 DOI: 10.1111/odi.15005] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2023] [Revised: 03/09/2024] [Accepted: 05/07/2024] [Indexed: 06/01/2024]
Abstract
OBJECTIVE Periodontitis is an inflammatory oral disease that occurs as a result of the damaging effects of the immune response against the subgingival microflora. Among the mechanisms involved, the nucleotide-binding oligomerization domain, leucine-rich repeat-containing proteins family member NLRP3 (NLR family pyrin domain-containing 3), proposed as the key regulator of macrophage-induced inflammation, is strongly associated with periodontal disease due to the bacterial activators. This paper aimed to present key general concepts of NLRP3 inflammasome activation and regulation in periodontal disease. METHOD A narrative review was conducted in order to depict the current knowledge on the relationship between NLRP3 inflammasome activity and periodontal disease. In vitro and in situ studies were retrieved and commented based on their relevance in the field. RESULTS The NLRP3 inflammasome activity stimulated by periodontal microbiota drive periodontal disease pathogenesis and progression. This occurs through the release of proinflammatory cytokines IL-1β, IL-18, and DAMPs (damage-associated molecular pattern molecules) following inflammasome activation. Moreover, the tissue expression of NLRP3 is dysregulated by oral microbiota, further exacerbating periodontal inflammation. CONCLUSION The review provides new insights into the relationship between the NLRP3 inflammasome activity and periodontal disease pathogenesis, highlighting the roles and regulatory mechanism of inflammatory molecules involved in the disease process.
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Affiliation(s)
- Andreea C Didilescu
- Department of Oral Biology, School of Dental Medicine, University at Buffalo, State University of New York, Buffalo, New York, USA
- Department of Embryology, Faculty of Dentistry, Carol Davila University of Medicine and Pharmacy, Bucharest, Romania
| | - Sreedevi Chinthamani
- Department of Oral Biology, School of Dental Medicine, University at Buffalo, State University of New York, Buffalo, New York, USA
| | - Frank A Scannapieco
- Department of Oral Biology, School of Dental Medicine, University at Buffalo, State University of New York, Buffalo, New York, USA
| | - Ashu Sharma
- Department of Oral Biology, School of Dental Medicine, University at Buffalo, State University of New York, Buffalo, New York, USA
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3
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Rams TE, Freedman IS, Chialastri SM, Slots J. Systemic ciprofloxacin treatment of multidrug-resistant Aggregatibacter actinomycetemcomitans in severe periodontitis. Diagn Microbiol Infect Dis 2024; 108:116162. [PMID: 38113673 DOI: 10.1016/j.diagmicrobio.2023.116162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Revised: 11/03/2023] [Accepted: 12/13/2023] [Indexed: 12/21/2023]
Abstract
An adult periodontitis patient treated with mechanical/surgical therapy experienced gingival necrosis and granulomas post-treatment. Aggregatibacter actinomycetemcomitans, a tissue-invasive pathogen, was recovered and multidrug-resistant but susceptible to ciprofloxacin. Systemic ciprofloxacin eliminated A. actinomycetemcomitans with marked clinical improvement. Ciprofloxacin may be prescribed for A. actinomycetemcomitans periodontal infection unresponsive to the common amoxicillin-metronidazole treatment.
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Affiliation(s)
- Thomas E Rams
- Department of Periodontology and Oral Implantology, Temple University School of Dentistry, Philadelphia, Pennsylvania, USA.
| | - Ira S Freedman
- Department of Periodontics, Nova Southeastern University College of Dental Medicine, Fort Lauderdale, Florida, USA
| | - Susan M Chialastri
- Department of Periodontology and Oral Implantology, Temple University School of Dentistry, Philadelphia, Pennsylvania, USA
| | - Jørgen Slots
- Division of Periodontology and Diagnostic Sciences, University of Southern California School of Dentistry, Los Angeles, California, USA
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Vinţeler N, Feurdean CN, Petkes R, Barabas R, Boşca BA, Muntean A, Feștilă D, Ilea A. Biomaterials Functionalized with Inflammasome Inhibitors-Premises and Perspectives. J Funct Biomater 2024; 15:32. [PMID: 38391885 PMCID: PMC10889089 DOI: 10.3390/jfb15020032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2023] [Revised: 01/21/2024] [Accepted: 01/25/2024] [Indexed: 02/24/2024] Open
Abstract
This review aimed at searching literature for data regarding the inflammasomes' involvement in the pathogenesis of oral diseases (mainly periodontitis) and general pathologies, including approaches to control inflammasome-related pathogenic mechanisms. The inflammasomes are part of the innate immune response that activates inflammatory caspases by canonical and noncanonical pathways, to control the activity of Gasdermin D. Once an inflammasome is activated, pro-inflammatory cytokines, such as interleukins, are released. Thus, inflammasomes are involved in inflammatory, autoimmune and autoinflammatory diseases. The review also investigated novel therapies based on the use of phytochemicals and pharmaceutical substances for inhibiting inflammasome activity. Pharmaceutical substances can control the inflammasomes by three mechanisms: inhibiting the intracellular signaling pathways (Allopurinol and SS-31), blocking inflammasome components (VX-765, Emricasan and VX-740), and inhibiting cytokines mediated by the inflammasomes (Canakinumab, Anakinra and Rilonacept). Moreover, phytochemicals inhibit the inflammasomes by neutralizing reactive oxygen species. Biomaterials functionalized by the adsorption of therapeutic agents onto different nanomaterials could represent future research directions to facilitate multimodal and sequential treatment in oral pathologies.
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Affiliation(s)
- Norina Vinţeler
- Department of Oral Rehabilitation, Faculty of Dentistry, "Iuliu Hațieganu" University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
| | - Claudia Nicoleta Feurdean
- Department of Oral Rehabilitation, Faculty of Dentistry, "Iuliu Hațieganu" University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
| | - Regina Petkes
- Department of Chemistry and Chemical Engineering of Hungarian Line of Study, Faculty of Chemistry and Chemical Engineering, Babeș-Bolyai University, 400028 Cluj-Napoca, Romania
| | - Reka Barabas
- Department of Chemistry and Chemical Engineering of Hungarian Line of Study, Faculty of Chemistry and Chemical Engineering, Babeș-Bolyai University, 400028 Cluj-Napoca, Romania
| | - Bianca Adina Boşca
- Department of Histology, Faculty of Medicine, "Iuliu Hațieganu" University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
| | - Alexandrina Muntean
- Department of Paediatric, Faculty of Dentistry, "Iuliu Hațieganu" University of Medicine and Pharmacy, Cluj-Napoca 400012, Romania
| | - Dana Feștilă
- Department of Orthodontics, Faculty of Dentistry, "Iuliu Hațieganu" University of Medicine and Pharmacy, Cluj-Napoca 400012, Romania
| | - Aranka Ilea
- Department of Oral Rehabilitation, Faculty of Dentistry, "Iuliu Hațieganu" University of Medicine and Pharmacy, 400012 Cluj-Napoca, Romania
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Padial-Molina M, Montalvo-Acosta S, Martín-Morales N, Pérez-Carrasco V, Magan-Fernandez A, Mesa F, O’Valle F, Garcia-Salcedo JA, Galindo-Moreno P. Correlation between Inflammasomes and Microbiota in Peri-Implantitis. Int J Mol Sci 2024; 25:961. [PMID: 38256037 PMCID: PMC10815557 DOI: 10.3390/ijms25020961] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 01/05/2024] [Accepted: 01/09/2024] [Indexed: 01/24/2024] Open
Abstract
The activation of inflammasomes is thought to induce the inflammatory process around dental implants. No information is available on the correlation between microbiota and inflammasomes in clinical samples from patients suffering peri-implantitis. For this cross-sectional study, 30 biofilm samples were obtained from 19 patients undergoing surgical treatment for peri-implantitis because of the presence of bleeding on probing, probing depth higher than 6 mm, and radiographic bone loss higher than 3 mm. Then, soft tissue samples from around the implant were also collected. The relative abundance of bacteria and alpha-diversity indexes were calculated after analyzing the 16S rRNA gene using next-generation sequencing. The soft-tissue samples were processed for evaluation of the inflammasomes NLRP3 and AIM2 as well as caspase-1 and IL-1β. The relative abundance (mean (SD)) of specific species indicated that the most abundant species were Porphyromonas gingivalis (10.95 (14.17)%), Fusobacterium vincentii (10.93 (13.18)%), Porphyromonas endodontalis (5.89 (7.23)%), Prevotella oris (3.88 (4.94)%), Treponema denticola (2.91 (3.19)%), and Tannerella forsythia (2.84 (4.15)%). Several correlations were found between the species and the immunohistochemical detection of the inflammasomes NLRP3 and AIM2 as well as caspase-1 and IL-1β, both in the epithelium and the lamina propria. A network analysis found an important cluster of variables formed by NLRP3 in the lamina propria and AIM2, caspase-1, and IL-1β in the lamina propria and the epithelium with Prevotella dentalis, Prevotella tannerae, Tannerella forsythia, or Selenomonas timonae. Thus, it could be concluded that inflammasomes NLRP3 and AIM2 and their downstream effectors caspase-1 and interleukin-1β can be significantly associated with specific bacteria.
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Affiliation(s)
- Miguel Padial-Molina
- Department of Oral Surgery and Implant Dentistry, School of Dentistry, University of Granada, 18071 Granada, Spain;
- Instituto de Investigación Biosanitaria ibs.GRANADA, 18012 Granada, Spain
| | - Saray Montalvo-Acosta
- PhD Program in Clinical Medicine and Public Health, University of Granada, 18071 Granada, Spain
| | - Natividad Martín-Morales
- PhD Program in Biomedicine, University of Granada, 18071 Granada, Spain
- Department of Pathology, School of Medicine, University of Granada, 18071 Granada, Spain
| | - Virginia Pérez-Carrasco
- Instituto de Investigación Biosanitaria ibs.GRANADA, 18012 Granada, Spain
- Centre for Genomics and Oncological Research, Pfizer–University of Granada–Andalusian Regional Government (GENYO), PTS Granada, 18016 Granada, Spain
- Microbiology Unit, University Hospital Virgen de las Nieves, 18014 Granada, Spain
| | - Antonio Magan-Fernandez
- Department of Periodontics, School of Dentistry, University of Granada, 18071 Granada, Spain (F.M.)
| | - Francisco Mesa
- Department of Periodontics, School of Dentistry, University of Granada, 18071 Granada, Spain (F.M.)
| | - Francisco O’Valle
- Instituto de Investigación Biosanitaria ibs.GRANADA, 18012 Granada, Spain
- Institute of Biopathology and Regenerative Medicine (IBIMER, CIBM), University of Granada, 18071 Granada, Spain
| | - Jose Antonio Garcia-Salcedo
- Instituto de Investigación Biosanitaria ibs.GRANADA, 18012 Granada, Spain
- Centre for Genomics and Oncological Research, Pfizer–University of Granada–Andalusian Regional Government (GENYO), PTS Granada, 18016 Granada, Spain
- Microbiology Unit, University Hospital Virgen de las Nieves, 18014 Granada, Spain
| | - Pablo Galindo-Moreno
- Department of Oral Surgery and Implant Dentistry, School of Dentistry, University of Granada, 18071 Granada, Spain;
- Instituto de Investigación Biosanitaria ibs.GRANADA, 18012 Granada, Spain
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Abraham D, Singh A, Goyal A. Salivary levels of NLRP3 protein are significantly raised in chronic periodontitis: A systematic review and meta-analysis of clinical studies. J Indian Soc Periodontol 2023; 27:552-558. [PMID: 38434508 PMCID: PMC10906798 DOI: 10.4103/jisp.jisp_185_23] [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: 04/11/2023] [Revised: 11/21/2023] [Accepted: 11/22/2023] [Indexed: 03/05/2024] Open
Abstract
Background To date, there is no confirmatory diagnostic test that can identify the type of periodontal disease and the disease progress. With the advent of "molecular biomarkers," this systematic review and meta-analysis were designed with the sole purpose of identifying a novel biomarker, namely, nucleotide leucine rich repeat pyrin protein-3 (NLRP3) inflammasome which has already been extensively researched for chronic inflammatory and autoimmune diseases. Types of Studies Reviewed Only case observational studies that evaluated the presence of human NLRP3 inflammasome in the saliva of patients with chronic periodontitis with no overlying systemic disease and compared the same to healthy patients to obtain quantitative data that can be statistically analyzed were included. The confirmatory test used in all the studies was the enzyme-linked immunosorbent assay. Results The broad-based search led to a total of three articles that fulfilled the inclusion criteria so that a meta-analysis of the results could be carried out. Data reveal that NLRP3 levels are raised in chronic periodontitis cases (P = 0.05; relative risk = 1.05 [0.00-2.09]). The risk of bias assessment was carried out according to the Joanna Briggs Institute Critical Appraisal Checklist where ten-point criteria were outlined indicating a low risk of bias for three studies. Clinical Implications NLPR3 inflammasome could be tested as a reliable biomarker in saliva to identify the type and progress of the periodontal disease.
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Affiliation(s)
- Dax Abraham
- Department of Conservative Dentistry and Endodontics, Faculty of Dental Studies, Manav Rachna Dental College, Manav Rachna International Institute of Research and Studies, Faridabad, Haryana, India
| | - Arundeep Singh
- Department of Conservative Dentistry and Endodontics, Faculty of Dental Studies, Manav Rachna Dental College, Manav Rachna International Institute of Research and Studies, Faridabad, Haryana, India
| | - Anjana Goyal
- Department of Biochemistry, Faculty of Dental Studies, Manav Rachna Dental College, Manav Rachna International Institute of Research and Studies, Faridabad, Haryana, India
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Xie H, Lin Y, Fang F. AR-A014418, a glycogen synthase kinase-3β inhibitor, mitigates lipopolysaccharide-induced inflammation in rat dental pulp stem cells via NLR family pyrin domain containing 3 inflammasome impairment. J Dent Sci 2023; 18:1534-1543. [PMID: 37799857 PMCID: PMC10548004 DOI: 10.1016/j.jds.2023.03.010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Revised: 03/09/2023] [Indexed: 10/07/2023] Open
Abstract
Background/purpose Cell pyroptosis and gingival inflammation have been implicated in periodontitis progression. Our previous study revealed that AR-A014418, a pharmacological inhibitor of glycogen synthase kinase-3β (GSK-3β), can enhance the migratory and osteogenic differentiation abilities of rat dental pulp stem cells (rDPSCs). The present study aimed to explore the effect of AR on the inflammation of rDPSCs. Materials and methods The primary rDPSCs were isolated and identified by flow cytometry, as well as Oil red O and Alizarin Red S staining. The rDPSCs were cultured and exposed to lipopolysaccharide (LPS) before treating them with different concentrations of AR-A014418. The cell viability was detected using the CCK-8 assay. The generation and secretion of pro-inflammatory cytokines (IL-18, TNF-α, L-1β, and IL-6) were examined by qPCR and ELISA, respectively. To investigate the activation of the NLRP3 inflammasome, the expression levels of pro-caspase 1, cleaved caspase 1, as well as NLRP3 were analyzed by western blotting and immunofluorescence, respectively. Results In the rDPSCs, LPS prohibited cell viability and enhanced the generation and secretion of pro-inflammatory cytokines. LPS upregulated NLRP3 and cleaved caspase-1 protein levels and promoted ASC speck formation in the rDPSCs. AR-A014418 administration effectively blocked the LPS-induced inflammation of the rDPSCs in a dose-dependent way. Mechanistically, AR-A014418 significantly restrained the up-regulation of NLRP3 and cleaved caspase-1 in LPS-treated rDPSCs. Conclusion Collectively, our findings suggest that AR-A014418 significantly mitigates LPS-induced inflammation of rDPSCs by blocking the activation of the NLRP3 inflammasome.
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Affiliation(s)
- Huilan Xie
- Shengli Clinical Medical College of Fujian Medical University, Fuzhou, China
- Department of Stomatology, Fujian Provincial Hospital, Fuzhou, China
| | - Yi Lin
- Department of Stomatology, Fujian Provincial Hospital, Fuzhou, China
| | - Fang Fang
- Department of Stomatology, Fujian Provincial Hospital, Fuzhou, China
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Jayaprakash Demirel K, Wu R, Neves Guimaraes A, Demirel I. The role of NLRP3 in regulating gingival epithelial cell responses evoked by Aggregatibacter actinomycetemcomitans. Cytokine 2023; 169:156316. [PMID: 37541072 DOI: 10.1016/j.cyto.2023.156316] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2023] [Revised: 07/18/2023] [Accepted: 07/31/2023] [Indexed: 08/06/2023]
Abstract
Aggregatibacter actinomycetemcomitans (A. actinomycetemcomitans) has myriads of virulence factors among which leukotoxin provides A. actinomycetemcomitans with the advantage to thrive in the surrounding hostile environment and evade host immune defences. The NLRP3 inflammasome has been associated with periodontal disease development. However, our understanding of the involvement of caspase-1, caspase-4, and NLRP3 in the release of IL-1β and other inflammatory mediators from gingival epithelial cells during a A. actinomycetemcomitans infection is limited. The aim of this study was to investigate how the inflammasome-associated proteins caspase-1, caspase-4 and NLRP3 regulate the immune response of gingival epithelial cells during a A. actinomycetemcomitans infection. Human gingival epithelial cells (Ca9-22) deficient in NLRP3, caspase-1 or caspase-4 were created using CRISPR/Cas9. Gingival epithelial cells were stimulated with the A. actinomycetemcomitans low-leukotoxic strain NCTC9710 or the highly leukotoxic JP2 strain HK 165 for 6, 12 and 24 h. The results showed that the JP2 strain HK1651 induced higher IL-1β and IL-1RA release and mediated more epithelial cell death compared to the NCTC9710 strain. These findings were found to be capsase-1, caspase-4 and NLRP3-dependant. A targeted protein analysis of inflammation-related proteins showed that the expression of 37 proteins were identified as being significantly altered after HK1651 infection compared to unstimulated Cas9 and NLRP3-deficient cells. Of the 37 proteins, 23 of these inflammation-related proteins released by NLRP3-deficient cells differed significantly compared to Cas9 cells after infection. This suggests that NLRP3 has a broad effect on the inflammatory response in gingival epithelial cells.
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Affiliation(s)
- Kartheyaene Jayaprakash Demirel
- Department of Oral and Maxillofacial Surgery, Faculty of Medicine and Health, Örebro University, Örebro, Sweden; Department of Odontological Research, Public Dental Service, Faculty of Medicine and Health, Örebro University, Örebro, Sweden.
| | - Rongrong Wu
- School of Medical Sciences, Örebro University, Örebro, Sweden
| | - Alessandra Neves Guimaraes
- Department of Odontological Research, Public Dental Service, Faculty of Medicine and Health, Örebro University, Örebro, Sweden; Department of Periodontology and Implantology, Public Dental Service, Faculty of Medicine and Health, Örebro University, Örebro, Sweden
| | - Isak Demirel
- School of Medical Sciences, Örebro University, Örebro, Sweden
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Zhao J, Zhang Y, Cheng Y, Xie S, Li DD, Zhang PF, Ren XY, Wang X. Effects of modified triangular flap for third molar extraction on distal periodontal health of second molar: A randomized controlled study. Heliyon 2023; 9:e16161. [PMID: 37234672 PMCID: PMC10208835 DOI: 10.1016/j.heliyon.2023.e16161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2023] [Revised: 04/26/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
Objective The aim of this study was to assess the effect of flap design for impacted mandibular third molar extraction on the distal periodontal tissue of their neighbors clinically, immunologically, and microbiologically. Study design This randomized controlled study comprised 100 patients who were allocated randomly to receive either a triangular flap or a modified triangular flap. The distal periodontal pocket depth, plaque index, bleeding on probing, the presence of Actinobacillus actinomycetemcomitans, Porphyromonas gingivalis and Prevotella intermedia, and the level of interleukin-1β, interleukin-8 and matrix metalloproteinase-8 of adjacent second molars were measured at baseline, and 1, 4 and 8 weeks after surgery. Results After 1 and 4 weeks, distal periodontal conditions of adjacent second molars deteriorated, along with an increase in subgingival microbiota and inflammatory factors in both groups. And compared to the modified triangular flap group, the triangular flap group significantly increased (p < 0.05). Prevotella intermedia, interleukin-1β and probing depth were positively correlated in both groups. After 8 weeks, they returned to the preoperative level. Conclusions In this study, both flap designs for impacted mandibular third molar extractions was associated with worse clinical periodontal indices, increased inflammatory biomarkers of gingival crevicular fluid, and more subgingival pathogenic microbiota within 4 weeks. But compared with the triangular flap, the modified triangular flap was better for distal periodontal health of adjacent second molars, which provides certain directions for clinical treatment.
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Affiliation(s)
- Jing Zhao
- Shanxi Medical University School and Hospital of Stomatology, Taiyuan 030001, China
- Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, China
| | - Yuan Zhang
- Shanxi Medical University School and Hospital of Stomatology, Taiyuan 030001, China
- Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, China
| | - Yongfeng Cheng
- Shanxi Medical University School and Hospital of Stomatology, Taiyuan 030001, China
- Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, China
| | - Si Xie
- Shanxi Medical University School and Hospital of Stomatology, Taiyuan 030001, China
- Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, China
| | | | - Peng-Fei Zhang
- Shanxi Medical University School and Hospital of Stomatology, Taiyuan 030001, China
- Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, China
| | - Xiu-Yun Ren
- Shanxi Medical University School and Hospital of Stomatology, Taiyuan 030001, China
- Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, China
| | - Xing Wang
- Shanxi Medical University School and Hospital of Stomatology, Taiyuan 030001, China
- Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, China
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Abstract
Bacterial genotoxins are peptide or protein virulence factors produced by several pathogens, which make single-strand breaks (SSBs) and/or double-strand DNA breaks (DSBs) in the target host cells. If host DNA inflictions are not resolved on time, host cell apoptosis, cell senescence, and/or even bacterial pathogen-related cancer may occur. Two multi-protein AB toxins, cytolethal distending toxin (CDT) produced by over 30 bacterial pathogens and typhoid toxin from Salmonella Typhi, as well as small polyketide-peptides named colibactin that causes the DNA interstrand cross-linking and subsequent DSBs is the most well-characterized bacterial genotoxins. Using these three examples, this review discusses the mechanisms by which these toxins deliver themselves into the nucleus of the target host cells and exert their genotoxic functions at the structural and functional levels.
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Affiliation(s)
- Liaoqi Du
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY 14853, USA
| | - Jeongmin Song
- Department of Microbiology and Immunology, Cornell University, Ithaca, NY 14853, USA
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Bueno MR, Ishikawa KH, Almeida-Santos G, Ando-Suguimoto ES, Shimabukuro N, Kawamoto D, Mayer MPA. Lactobacilli Attenuate the Effect of Aggregatibacter actinomycetemcomitans Infection in Gingival Epithelial Cells. Front Microbiol 2022; 13:846192. [PMID: 35602018 PMCID: PMC9116499 DOI: 10.3389/fmicb.2022.846192] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2021] [Accepted: 03/29/2022] [Indexed: 01/10/2023] Open
Abstract
Probiotics may be considered as an additional strategy to achieve a balanced microbiome in periodontitis. However, the mechanisms underlying the use of probiotics in the prevention or control of periodontitis are still not fully elucidated. This in vitro study aimed to evaluate the effect of two commercially available strains of lactobacilli on gingival epithelial cells (GECs) challenged by Aggregatibacter actinomycetemcomitans. OBA-9 GECs were infected with A. actinomycetemcomitans strain JP2 at an MOI of 1:100 and/or co-infected with Lactobacillus acidophilus La5 (La5) or Lacticaseibacillus rhamnosus Lr32 (Lr32) at an MOI of 1:10 for 2 and 24 h. The number of adherent/internalized bacteria to GECs was determined by qPCR. Production of inflammatory mediators (CXCL-8, IL-1β, GM-CSF, and IL-10) by GECs was determined by ELISA, and the expression of genes encoding cell receptors and involved in apoptosis was determined by RT-qPCR. Apoptosis was also analyzed by Annexin V staining. There was a slight loss in OBA-9 cell viability after infection with A. actinomycetemcomitans or the tested probiotics after 2 h, which was magnified after 24-h co-infection. Adherence of A. actinomycetemcomitans to GECs was 1.8 × 107 (± 1.2 × 106) cells/well in the mono-infection but reduced to 1.2 × 107 (± 1.5 × 106) in the co-infection with Lr32 and to 6 × 106 (± 1 × 106) in the co-infection with La5 (p < 0.05). GECs mono-infected with A. actinomycetemcomitans produced CXCL-8, GM-CSF, and IL-1β, and the co-infection with both probiotic strains altered this profile. While the co-infection of A. actinomycetemcomitans with La5 resulted in reduced levels of all mediators, the co-infection with Lr32 promoted reduced levels of CXCL-8 and GM-CSF but increased the production of IL-1β. The probiotics upregulated the expression of TLR2 and downregulated TLR4 in cells co-infected with A. actinomycetemcomitans. A. actinomycetemcomitans-induced the upregulation of NRLP3 was attenuated by La5 but increased by Lr32. Furthermore, the transcription of the anti-apoptotic gene BCL-2 was upregulated, whereas the pro-apoptotic BAX was downregulated in cells co-infected with A. actinomycetemcomitans and the probiotics. Infection with A. actinomycetemcomitans induced apoptosis in GECs, whereas the co-infection with lactobacilli attenuated the apoptotic phenotype. Both tested lactobacilli may interfere in A. actinomycetemcomitans colonization of the oral cavity by reducing its ability to interact with gingival epithelial cells and modulating cells response. However, L. acidophilus La5 properties suggest that this strain has a higher potential to control A. actinomycetemcomitans-associated periodontitis than L. rhamnosus Lr32.
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Affiliation(s)
- Manuela R Bueno
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.,Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil
| | - Karin H Ishikawa
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Gislane Almeida-Santos
- Department of Immunology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Ellen S Ando-Suguimoto
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Natali Shimabukuro
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Dione Kawamoto
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil
| | - Marcia P A Mayer
- Department of Microbiology, Institute of Biomedical Sciences, University of São Paulo, São Paulo, Brazil.,Department of Stomatology, School of Dentistry, University of São Paulo, São Paulo, Brazil
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12
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Aggregatibacter actinomycetemcomitans Leukotoxin Activates the NLRP3 Inflammasome and Cell-to-Cell Communication. Pathogens 2022; 11:pathogens11020159. [PMID: 35215102 PMCID: PMC8877716 DOI: 10.3390/pathogens11020159] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2021] [Revised: 01/14/2022] [Accepted: 01/24/2022] [Indexed: 02/04/2023] Open
Abstract
Carriers of highly leukotoxic genotypes of Aggregatibacter actinomycetemcomitans are at high risk for rapid degradation of tooth-supporting tissues. The leukotoxin (LtxA) expressed by this bacterium induces a rapid pro-inflammatory response in leukocytes that results in cell death. The aim of the present study was to increase the understanding of LtxA-induced leukocyte activation mechanisms and of possible associated osteoclast differentiation. The effect of LtxA on activation of the inflammasome complex was studied in THP-1 wild type and in NLRP3- and ASC knockout cells. Cell-to-cell communication was assessed by fluorescent parachute assays, and THP-1 differentiation into osteoclast-like cells was investigated microscopically. The results showed that LtxA induced inflammatory cell death, which involved activation of the NLRP3 inflammasome and gap junction cell-to-cell communication. THP-1 cells treated with lipopolysaccharide (LPS) and LtxA together differentiated into an osteoclast-like phenotype. Here, LPS prevented LtxA-mediated cell death but failed to induce osteoclast differentiation on its own. However, pit formation was not significantly enhanced by LtxA. We conclude that A. actinomycetemcomitans leukotoxicity mediates activation of the NLRP3 inflammasome and cell-to-cell communication in the induced pro-inflammatory cell death. In addition, LtxA stimulated differentiation towards osteoclasts-like cells in LPS-treated THP-1 cells.
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13
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Nrf2 in the Field of Dentistry with Special Attention to NLRP3. Antioxidants (Basel) 2022; 11:antiox11010149. [PMID: 35052653 PMCID: PMC8772975 DOI: 10.3390/antiox11010149] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2021] [Revised: 01/06/2022] [Accepted: 01/09/2022] [Indexed: 02/06/2023] Open
Abstract
The aim of this review article was to summarize the functional implications of the nuclear factor E2-related factor or nuclear factor (erythroid-derived 2)-like 2 (Nrf2), with special attention to the NACHT (nucleotide-binding oligomerization), LRR (leucine-rich repeat), and PYD (pyrin domain) domains-containing protein 3 (NLRP3) inflammasome in the field of dentistry. NLRP3 plays a crucial role in the progression of inflammatory and adaptive immune responses throughout the body. It is already known that this inflammasome is a key regulator of several systemic diseases. The initiation and activation of NLRP3 starts with the oral microbiome and its association with the pathogenesis and progression of several oral diseases, including periodontitis, periapical periodontitis, and oral squamous cell carcinoma (OSCC). The possible role of the inflammasome in oral disease conditions may involve the aberrant regulation of various response mechanisms, not only in the mouth but in the whole body. Understanding the cellular and molecular biology of the NLRP3 inflammasome and its relationship to Nrf2 is necessary for the rationale when suggesting it as a potential therapeutic target for treatment and prevention of oral inflammatory and immunological disorders. In this review, we highlighted the current knowledge about NLRP3, its likely role in the pathogenesis of various inflammatory oral processes, and its crosstalk with Nrf2, which might offer future possibilities for disease prevention and targeted therapy in the field of dentistry and oral health.
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Isola G, Polizzi A, Santonocito S, Alibrandi A, Williams RC. Periodontitis activates the NLRP3 inflammasome in serum and saliva. J Periodontol 2022; 93:135-145. [PMID: 34008185 DOI: 10.1002/jper.21-0049] [Citation(s) in RCA: 55] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2021] [Revised: 05/09/2021] [Accepted: 05/10/2021] [Indexed: 02/05/2023]
Abstract
BACKGROUND Nod-like receptor family pyrin domain-containing protein-3 (NLRP3) complex inflammasome has potentially been shown to play an important role in the development of periodontitis and diabetes. The objective of this study was to analyze the association between serum and salivary NLRP3 concentrations in patients with periodontitis and type-II diabetes mellitus (DM) and to evaluate whether this association was influenced by potential confounders. METHODS For the present study, a cohort of healthy controls (n = 32), and patients with periodontitis (n = 34), type-II DM (n = 33), and a combination of periodontitis + type-II DM (n = 34) were enrolled. Patients were characterized on the basis of their periodontal status and analyzed for demographic characteristics, serum mediators, and for serum and salivary concentrations of NLRP3. A uni- and multivariate model was established to analyze whether periodontitis, type-II DM, and CRP influenced serum and salivary NLRP3 concentrations. RESULTS In comparison to type-II DM patients and healthy controls, patients with periodontitis (serum, P = 0.003; saliva P = 0.012) and periodontitis + type-II DM (serum, P = 0.028; saliva, P = 0.003) had elevated serum and salivary NLRP3 concentrations. The multivariate regression model showed that periodontitis (P = 0.029) and HDL-cholesterol (P = 0.012) were significant predictors of serum NLRP3 concentrations whereas periodontitis (P = 0.036) and CRP (P = 0.012) were significant predictors of salivary NLRP3. CONCLUSION The results of the present study showed that periodontitis and periodontitis + type-II DM patients had higher serum and salivary NLRP3 concentrations in comparison to healthy controls and patients with type-II DM. Periodontitis was demonstrated to be a significant predictor of both serum and salivary NLRP3 concentrations.
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Affiliation(s)
- Gaetano Isola
- Department of General Surgery and Surgical-Medical Specialties, Unit of Oral Surgery and Periodontology, School of Dentistry, University of Catania, Catania, Italy
| | - Alessandro Polizzi
- Department of General Surgery and Surgical-Medical Specialties, Unit of Oral Surgery and Periodontology, School of Dentistry, University of Catania, Catania, Italy
| | - Simona Santonocito
- Department of General Surgery and Surgical-Medical Specialties, Unit of Oral Surgery and Periodontology, School of Dentistry, University of Catania, Catania, Italy
| | - Angela Alibrandi
- Department of Economics, Unit of Statistical and Mathematical Sciences, University of Messina, Messina, Italy
| | - Ray C Williams
- Department of Periodontology, UNC-Chapel Hill School of Dentistry, Chapel Hill, North Carolina, USA
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15
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Pyroptosis-Mediated Periodontal Disease. Int J Mol Sci 2021; 23:ijms23010372. [PMID: 35008798 PMCID: PMC8745163 DOI: 10.3390/ijms23010372] [Citation(s) in RCA: 36] [Impact Index Per Article: 12.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 12/23/2021] [Accepted: 12/27/2021] [Indexed: 12/17/2022] Open
Abstract
Pyroptosis is a caspase-dependent process relevant to the understanding of beneficial host responses and medical conditions for which inflammation is central to the pathophysiology of the disease. Pyroptosis has been recently suggested as one of the pathways of exacerbated inflammation of periodontal tissues. Hence, this focused review aims to discuss pyroptosis as a pathological mechanism in the cause of periodontitis. The included articles presented similarities regarding methods, type of cells applied, and cell stimulation, as the outcomes also point to the same direction considering the cellular events. The collected data indicate that virulence factors present in the diseased periodontal tissues initiate the inflammasome route of tissue destruction with caspase activation, cleavage of gasdermin D, and secretion of interleukins IL-1β and IL-18. Consequently, removing periopathogens’ virulence factors that trigger pyroptosis is a potential strategy to combat periodontal disease and regain tissue homeostasis.
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16
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Varon C, Azzi-Martin L, Khalid S, Seeneevassen L, Ménard A, Spuul P. Helicobacters and cancer, not only gastric cancer? Semin Cancer Biol 2021; 86:1138-1154. [PMID: 34425210 DOI: 10.1016/j.semcancer.2021.08.007] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2021] [Revised: 08/11/2021] [Accepted: 08/16/2021] [Indexed: 12/11/2022]
Abstract
The Helicobacter genus actually comprises 46 validly published species divided into two main clades: gastric and enterohepatic Helicobacters. These bacteria colonize alternative sites of the digestive system in animals and humans, and contribute to inflammation and cancers. In humans, Helicobacter infection is mainly related to H. pylori, a gastric pathogen infecting more than half of the world's population, leading to chronic inflammation of the gastric mucosa that can evolve into two types of gastric cancers: gastric adenocarcinomas and gastric MALT lymphoma. In addition, H. pylori but also non-H. pylori Helicobacter infection has been associated with many extra-gastric malignancies. This review focuses on H. pylori and its role in gastric cancers and extra-gastric diseases, as well as malignancies induced by non-H. pylori Helicobacters. Their different virulence factors and their involvement in carcinogenesis is discussed. This review highlights the importance of both gastric and enterohepatic Helicobacters in gastrointestinal and liver cancers.
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Affiliation(s)
- Christine Varon
- Univ. Bordeaux, INSERM, UMR1053 Bordeaux Research in Translational Oncology, BaRITOn, Bordeaux, France
| | - Lamia Azzi-Martin
- Univ. Bordeaux, INSERM, UMR1053 Bordeaux Research in Translational Oncology, BaRITOn, Bordeaux, France; Univ. Bordeaux, UFR des Sciences Médicales, Bordeaux, France
| | - Sadia Khalid
- Tallinn University of Technology, Department of Chemistry and Biotechnology, Akadeemia RD 15, 12618, Tallinn, Estonia
| | - Lornella Seeneevassen
- Univ. Bordeaux, INSERM, UMR1053 Bordeaux Research in Translational Oncology, BaRITOn, Bordeaux, France
| | - Armelle Ménard
- Univ. Bordeaux, INSERM, UMR1053 Bordeaux Research in Translational Oncology, BaRITOn, Bordeaux, France
| | - Pirjo Spuul
- Tallinn University of Technology, Department of Chemistry and Biotechnology, Akadeemia RD 15, 12618, Tallinn, Estonia.
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17
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Li Y, Ling J, Jiang Q. Inflammasomes in Alveolar Bone Loss. Front Immunol 2021; 12:691013. [PMID: 34177950 PMCID: PMC8221428 DOI: 10.3389/fimmu.2021.691013] [Citation(s) in RCA: 74] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2021] [Accepted: 05/18/2021] [Indexed: 12/18/2022] Open
Abstract
Bone remodeling is tightly controlled by osteoclast-mediated bone resorption and osteoblast-mediated bone formation. Fine tuning of the osteoclast-osteoblast balance results in strict synchronization of bone resorption and formation, which maintains structural integrity and bone tissue homeostasis; in contrast, dysregulated bone remodeling may cause pathological osteolysis, in which inflammation plays a vital role in promoting bone destruction. The alveolar bone presents high turnover rate, complex associations with the tooth and periodontium, and susceptibility to oral pathogenic insults and mechanical stress, which enhance its complexity in host defense and bone remodeling. Alveolar bone loss is also involved in systemic bone destruction and is affected by medication or systemic pathological factors. Therefore, it is essential to investigate the osteoimmunological mechanisms involved in the dysregulation of alveolar bone remodeling. The inflammasome is a supramolecular protein complex assembled in response to pattern recognition receptors and damage-associated molecular patterns, leading to the maturation and secretion of pro-inflammatory cytokines and activation of inflammatory responses. Pyroptosis downstream of inflammasome activation also facilitates the clearance of intracellular pathogens and irritants. However, inadequate or excessive activity of the inflammasome may allow for persistent infection and infection spreading or uncontrolled destruction of the alveolar bone, as commonly observed in periodontitis, periapical periodontitis, peri-implantitis, orthodontic tooth movement, medication-related osteonecrosis of the jaw, nonsterile or sterile osteomyelitis of the jaw, and osteoporosis. In this review, we present a framework for understanding the role and mechanism of canonical and noncanonical inflammasomes in the pathogenesis and development of etiologically diverse diseases associated with alveolar bone loss. Inappropriate inflammasome activation may drive alveolar osteolysis by regulating cellular players, including osteoclasts, osteoblasts, osteocytes, periodontal ligament cells, macrophages, monocytes, neutrophils, and adaptive immune cells, such as T helper 17 cells, causing increased osteoclast activity, decreased osteoblast activity, and enhanced periodontium inflammation by creating a pro-inflammatory milieu in a context- and cell type-dependent manner. We also discuss promising therapeutic strategies targeting inappropriate inflammasome activity in the treatment of alveolar bone loss. Novel strategies for inhibiting inflammasome signaling may facilitate the development of versatile drugs that carefully balance the beneficial contributions of inflammasomes to host defense.
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Affiliation(s)
- Yang Li
- Department of Endodontics, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, China
| | - Junqi Ling
- Department of Endodontics, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, China.,Guangdong Province Key Laboratory of Stomatology, Department of Operative Dentistry and Endodontics, Guanghua School of Stomatology, Hospital of Stomatology, Sun Yat-sen University, Guangzhou, China
| | - Qianzhou Jiang
- Department of Endodontics, Affiliated Stomatology Hospital of Guangzhou Medical University, Guangzhou Key Laboratory of Basic and Applied Research of Oral Regenerative Medicine, Guangzhou, China
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18
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Betancur D, Muñoz Grez C, Oñate A. Comparative Analysis of Cytokine Expression in Oral Keratinocytes and THP-1 Macrophages in Response to the Most Prevalent Serotypes of Aggregatibacter actinomycetemcomitans. Microorganisms 2021; 9:622. [PMID: 33802988 PMCID: PMC8002688 DOI: 10.3390/microorganisms9030622] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 03/12/2021] [Accepted: 03/14/2021] [Indexed: 12/16/2022] Open
Abstract
BACKGROUND Periodontitis is a chronic inflammatory disease associated with a dysbiotic biofilm. Many pathogens have been related with its progression and severity, one of which is Aggregatibacter actinomycetemcomitans, a Gram-negative bacteria with seven serotypes (a-g) according with the structure of its LPS, with serotype b defined as the most virulent compared with the other serotypes. The aim of this study was to evaluate the response of oral keratinocytes and macrophages to A. actinomycetemcomitans. METHODS Oral keratinocytes (OKF6/TERT2) and macrophages (THP-1) were infected with A. actinomycetemcomitans serotypes a, b and c. The expression of IL-1β, IL-6, IL-8, IL-18, TNF-α, MMP-9, RANKL, TLR-2, TLR-4, TLR-6, thymic stromal lymphopoietin (TSLP), and ICAM-1 was evaluated by qPCR at 2 and 24 h after infection. RESULTS An increase in the expression of these molecules was induced by all serotypes at both times of infection, with macrophages showing higher levels of expression at 24 h compared to epithelial cells in which the highest levels were observed in the first hours after infection. CONCLUSIONS Keratinocytes and macrophages contribute to the inflammation in periodontitis from the early stages of infection, producing the first waves of cytokines, acting as the first signal for professional immune cell recruitment and modulation of more specific immune responses.
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Affiliation(s)
| | | | - Angel Oñate
- Laboratory of Molecular Immunology, Department of Microbiology, Faculty of Biological Sciences, Universidad de Concepción, Concepción 4030000, Chile; (D.B.); (C.M.G.)
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19
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Venugopal M, Nambiar J, Nair BG. Anacardic acid-mediated regulation of osteoblast differentiation involves mitigation of inflammasome activation pathways. Mol Cell Biochem 2020; 476:819-829. [PMID: 33090336 DOI: 10.1007/s11010-020-03947-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Accepted: 10/10/2020] [Indexed: 10/23/2022]
Abstract
Disruption of the finely tuned osteoblast-osteoclast balance is the underlying basis of several inflammatory bone diseases, such as osteomyelitis, osteoporosis, and septic arthritis. Prolonged and unrestrained exposure to inflammatory environment results in reduction of bone mineral density by downregulating osteoblast differentiation. Earlier studies from our laboratory have identified that Anacardic acid (AA), a constituent of Cashew nut shell liquid that is used widely in traditional medicine, has potential inhibitory effect on gelatinases (MMP2 and MMP9) which are over-expressed in numerous inflammatory conditions (Omanakuttan et al. in Mol Pharmacol, 2012 and Nambiar et al. in Exp Cell Res, 2016). The study demonstrated for the first time that AA promotes osteoblast differentiation in lipopolysaccharide-treated osteosarcoma cells (MG63) by upregulating specific markers, like osteocalcin, receptor activator of NF-κB ligand, and alkaline phosphatase. Furthermore, expression of the negative regulators, such as nuclear factor-κB, matrix metalloproteinases (MMPs), namely MMP13, and MMP1, along with several inflammatory markers, such as Interleukin-1β and Nod-like receptor protein 3 were downregulated by AA. Taken together, AA expounds as a novel template for development of potential pharmacological therapeutics for inflammatory bone diseases.
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Affiliation(s)
- Meera Venugopal
- Amrita School of Biotechnology, Amrita Vishwa Vidyapeetham, Amritapuri, Clappana P.O, Kollam, Kerala, India, 690525
| | - Jyotsna Nambiar
- Amrita School of Biotechnology, Amrita Vishwa Vidyapeetham, Amritapuri, Clappana P.O, Kollam, Kerala, India, 690525
| | - Bipin G Nair
- Amrita School of Biotechnology, Amrita Vishwa Vidyapeetham, Amritapuri, Clappana P.O, Kollam, Kerala, India, 690525.
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20
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Rab5a Promotes Cytolethal Distending Toxin B-Induced Cytotoxicity and Inflammation. Infect Immun 2020; 88:IAI.00132-20. [PMID: 32747601 DOI: 10.1128/iai.00132-20] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2020] [Accepted: 07/25/2020] [Indexed: 12/27/2022] Open
Abstract
The cytolethal distending toxin B subunit (CdtB) induces significant cytotoxicity and inflammation in many cell types that are involved in the pathogenesis of postinfectious irritable bowel syndrome (PI-IBS). However, the underlying mechanisms remain unclear. This study tested the potential role of Rab small GTPase 5a (Rab5a) in the process. We tested mRNA and protein expression of proinflammatory cytokines (interleukin-1β [IL-1β] and IL-6) in THP-1 macrophages by quantitative PCR (qPCR) and enzyme-linked immunosorbent assays (ELISAs), respectively. In the primary colonic epithelial cells, Cdt treatment induced a CdtB-Rab5a-cellugyrin association. Rab5a silencing, by target small hairpin RNAs (shRNAs), largely inhibited CdtB-induced cytotoxicity and apoptosis in colon epithelial cells. CRISPR/Cas9-mediated Rab5a knockout also attenuated CdtB-induced colon epithelial cell death. Conversely, forced overexpression of Rab5a intensified CdtB-induced cytotoxicity. In THP-1 human macrophages, Rab5a shRNA or knockout significantly inhibited CdtB-induced mRNA expression and production of proinflammatory cytokines (IL-1β and IL-6). Rab5a depletion inhibited activation of nuclear factor-κB (NF-κB) and Jun N-terminal protein kinase (JNK) signaling in CdtB-treated THP-1 macrophages. Rab5a appears essential for CdtB-induced cytotoxicity in colonic epithelial cells and proinflammatory responses in THP-1 macrophages.
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21
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Rocha FRG, Delitto AE, de Souza JAC, González-Maldonado LA, Wallet SM, Rossa Junior C. Relevance of Caspase-1 and Nlrp3 Inflammasome on Inflammatory Bone Resorption in A Murine Model of Periodontitis. Sci Rep 2020; 10:7823. [PMID: 32385413 PMCID: PMC7210885 DOI: 10.1038/s41598-020-64685-y] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Accepted: 04/06/2020] [Indexed: 12/11/2022] Open
Abstract
This study investigates the role of NLRP3 inflammasome and its main effector Caspase-1 in inflammation and alveolar bone resorption associated with periodontitis. Heat-killed Aggregatibacter actinomycetemcomitans (Aa) was injected 3x/week (4 weeks) into gingival tissues of wild-type (WT), Nlrp3-KO and Caspase1-KO mice. Bone resorption was measured by µCT and osteoclast number was determined by tartrate-resistant acid phosphatase (TRAP) staining. Inflammation was assessed histologically (H/E staining and immunofluorescence of CD45 and Ly6G). In vitro studies determined the influence of Nlrp3 and Caspase-1 in Rankl-induced osteoclast differentiation and activity and on LPS-induced expression of inflammation-associated genes. Bone resorption was significantly reduced in Casp1-KO but not in Nlrp3-KO mice. Casp1-KO mice had increased in osteoclast numbers, whereas the inflammatory infiltrate or on gene expression were similar to those of WT and Nlrp3-KO mice. Strikingly, osteoclasts differentiated from Nlrp3-deficient macrophages had increased resorbing activity in vitro. LPS-induced expression of Il-10, Il-12 and Tnf-α was significantly reduced in Nlrp3- and Casp1-deficient macrophages. As an inceptive study, these results suggest that Nlrp3 inflammasome does not play a significant role in inflammation and bone resorption in vivo and that Caspase-1 has a pro-resorptive role in experimental periodontal disease.
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Affiliation(s)
- Fernanda R G Rocha
- Department of Oral Biology, College of Dentistry, University of Florida, Gainesville, FL, USA.,Department of Diagnosis and Surgery, UNESP-State University of Sao Paulo, School of Dentistry at Araraquara, Araraquara, SP, Brazil
| | - Andrea E Delitto
- Department of Physical Therapy, University of Florida Health Science Center, Gainesville, FL, USA
| | - Joao A Chaves de Souza
- Department of Stomatology, School of Dentistry, Federal University of Goias (UFG), Goiania, GO, Brazil
| | - Laura A González-Maldonado
- Department of Diagnosis and Surgery, UNESP-State University of Sao Paulo, School of Dentistry at Araraquara, Araraquara, SP, Brazil
| | - Shannon M Wallet
- Department of Oral and Craniofacial Health Sciences, School of Dentistry, University of North Carolina, Chapel Hill, NC, USA
| | - Carlos Rossa Junior
- Department of Diagnosis and Surgery, UNESP-State University of Sao Paulo, School of Dentistry at Araraquara, Araraquara, SP, Brazil.
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22
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Distinct Signaling Pathways Between Human Macrophages and Primary Gingival Epithelial Cells by Aggregatibacter actinomycetemcomitans. Pathogens 2020; 9:pathogens9040248. [PMID: 32230992 PMCID: PMC7238148 DOI: 10.3390/pathogens9040248] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2019] [Revised: 03/23/2020] [Accepted: 03/23/2020] [Indexed: 12/12/2022] Open
Abstract
In aggressive periodontitis, the dysbiotic microbial community in the subgingival crevice, which is abundant in Aggregatibacter actinomycetemcomitans, interacts with extra- and intracellular receptors of host cells, leading to exacerbated inflammation and subsequent tissue destruction. Our goal was to understand the innate immune interactions of A. actinomycetemcomitans with macrophages and human gingival epithelial cells (HGECs) on the signaling cascade involved in inflammasome and inflammatory responses. U937 macrophages and HGECs were co-cultured with A. actinomycetemcomitans strain Y4 and key signaling pathways were analyzed using real-time PCR, Western blotting and cytokine production by ELISA. A. actinomycetemcomitans infection upregulated the transcription of TLR2, TLR4, NOD2 and NLRP3 in U937 macrophages, but not in HGECs. Transcription of IL-1β and IL-18 was upregulated in macrophages and HGECs after 1 h interaction with A. actinomycetemcomitans, but positive regulation persisted only in macrophages, resulting in the presence of IL-1β in macrophage supernatant. Immunoblot data revealed that A. actinomycetemcomitans induced the phosphorylation of AKT and ERK1/2, possibly leading to activation of the NF-κB pathway in macrophages. On the other hand, HGEC signaling induced by A. actinomycetemcomitans was distinct, since AKT and 4EBP1 were phosphorylated after stimulation with A. actinomycetemcomitans, whereas ERK1/2 was not. Furthermore, A. actinomycetemcomitans was able to induce the cleavage of caspase-1 in U937 macrophages in an NRLP3-dependent pathway. Differences in host cell responses, such as those seen between HGECs and macrophages, suggested that survival of A. actinomycetemcomitans in periodontal tissues may be favored by its ability to differentially activate host cells.
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Protective effect of hinokitiol against periodontal bone loss in ligature-induced experimental periodontitis in mice. Arch Oral Biol 2020; 112:104679. [PMID: 32062102 DOI: 10.1016/j.archoralbio.2020.104679] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 01/15/2020] [Accepted: 02/03/2020] [Indexed: 12/25/2022]
Abstract
OBJECTIVE The overall objective of this study was to investigate the effects of hinokitiol on periodontal bone loss in a murine model of experimental periodontitis and evaluate the anti-inflammatory activity of hinokitiol in vitro. DESIGN Periodontitis was induced by tying a silk ligature around the maxillary second molar of mice for 8 days. Hinokitiol was injected once a day for 7 days into the palatal gingiva of the ligated molar. Periodontal bone loss was then assessed morphometrically in the maxillary second molar, and the number of tartrate-resistant acid phosphatase positive multinucleated giant cells around the molar was quantified. The bacterial load of the silk ligature was calculated by counting the number of colony-forming units, while the transcription levels of proinflammatory cytokine-related genes in the palatal gingiva were evaluated by real-time qPCR. The activity of hinokitiol against LPS-induced transcription of proinflammatory genes in RAW 264.7 macrophages was also examined. RESULTS Local treatment with hinokitiol significantly inhibited the alveolar bone loss and osteoclast differentiation induced by tooth ligation. In addition, hinokitiol treatment decreased the oral bacterial load of the silk ligature and downregulated the mRNA levels of inflammatory cytokine-related genes, both in vitro and in vivo. CONCLUSION The results indicated that hinokitiol exhibits antibacterial and anti-inflammatory activity and exerts a protective effect against periodontitis.
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24
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de Alencar JB, Zacarias JMV, Tsuneto PY, de Souza VH, Silva CDOE, Visentainer JEL, Sell AM. Influence of inflammasome NLRP3, and IL1B and IL2 gene polymorphisms in periodontitis susceptibility. PLoS One 2020; 15:e0227905. [PMID: 31978095 PMCID: PMC6980600 DOI: 10.1371/journal.pone.0227905] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Accepted: 12/22/2019] [Indexed: 12/14/2022] Open
Abstract
The pathogenesis of periodontitis (PD) involves several molecules of the immune system that interact in a network to eliminate the periodontopathogens, yet, they contribute to periodontal tissue destruction. The different mechanisms that lead to periodontal tissue damage are not clear. Despite this, immune response genes have been related to the development of PD previously, such as those involved in inflammasomes which are multiprotein complexes and cytokines including Interleukin-1. The aim of the study was to evaluate the polymorphisms in NLRP3 inflammasome, cytokine and receptor of cytokines genes in the development of periodontitis. This case-control study was conducted in 186 patients with PD (stage II and III and grade B) and 208 controls (localized gingivitis and periodontally healthy individuals). Genotyping was performed using PCR-RFLP for the SNP rs4612666 in NLRP3 and using PCR-SSP for IL1A, IL1B, IL1R, IL1RN, IL4RA, INFG, TGFB1, TNF, IL2, IL4, IL6, and IL10. Cytokine serum levels were measured using Luminex technology. SNPStats and OpenEpi software were used to perform statistical analysis. The higher frequencies of NLRP3 T/C and IL1B -511 T/T genotypes and IL2 (+166, -330) GT haplotype were observed in patients with PD compared to controls. The SNPs in NLRP3, IL1R +1970, IL6–174, TNF -308, IL2 +166 and -330, TGFB1 +869 and +915, IL4RA +1902, IL4–1098 and -590 were associated to PD in men. In conclusion, polymorphisms in NLRP3, IL1B and IL2 genes were associated to PD susceptibility. Men carrying the NLRP3, IL1R, IL6, TNF, IL2, TGFB1, IL4RA and IL4 polymorphisms had greater susceptibility than women for developing PD.
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Affiliation(s)
- Josiane Bazzo de Alencar
- Department of Clinical Analysis and Biomedicine, Post-Graduation Program in Biosciences and Physiophatology, State University of Maringá, Maringá, Paraná, Brazil
- * E-mail:
| | - Joana Maira Valentini Zacarias
- Department of Clinical Analysis and Biomedicine, Post-Graduation Program in Biosciences and Physiophatology, State University of Maringá, Maringá, Paraná, Brazil
| | - Patrícia Yumeko Tsuneto
- Department of Clinical Analysis and Biomedicine, Post-Graduation Program in Biosciences and Physiophatology, State University of Maringá, Maringá, Paraná, Brazil
| | - Victor Hugo de Souza
- Department of Clinical Analysis and Biomedicine, Post-Graduation Program in Biosciences and Physiophatology, State University of Maringá, Maringá, Paraná, Brazil
| | | | - Jeane Eliete Laguila Visentainer
- Department of Clinical Analysis and Biomedicine, Post-Graduation Program in Biosciences and Physiophatology, State University of Maringá, Maringá, Paraná, Brazil
- Department of Basic Health Sciences, State University of Maringá, Maringá, Paraná, Brazil
| | - Ana Maria Sell
- Department of Clinical Analysis and Biomedicine, Post-Graduation Program in Biosciences and Physiophatology, State University of Maringá, Maringá, Paraná, Brazil
- Department of Basic Health Sciences, State University of Maringá, Maringá, Paraná, Brazil
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25
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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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26
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Leng F, Yin H, Qin S, Zhang K, Guan Y, Fang R, Wang H, Li G, Jiang Z, Sun F, Wang DC, Xie C. NLRP6 self-assembles into a linear molecular platform following LPS binding and ATP stimulation. Sci Rep 2020; 10:198. [PMID: 31932628 PMCID: PMC6957519 DOI: 10.1038/s41598-019-57043-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2019] [Accepted: 12/19/2019] [Indexed: 12/21/2022] Open
Abstract
NOD-like receptors (NLRs) localize in the cytosol to recognize intracellular pathogen products and initialize the innate immune response. However, the ligands and ligand specificity of many NLRs remain unclear. One such NLR, NLRP6, plays an important role in maintaining intestinal homeostasis and protecting against various intestinal diseases such as colitis and intestinal tumorigenesis. Here, we show that the major component of the outer membrane of gram-negative bacteria, lipopolysaccharide (LPS), binds NLRP6 directly and induces global conformational change and dimerization. Following stimulation by ATP, the NLRP6 homodimer can further assemble into a linear molecular platform, and ASC is recruited to form higher molecular structures, indicative of a step-by-step activation mechanism. Our study sheds light on the mystery of LPS-induced inflammasome initiation, reveals the architecture and structural basis of potential pre-inflammasome, and suggests a novel molecular assembly pattern for immune receptors.
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Affiliation(s)
- Fangwei Leng
- National Laboratory of Macromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China.,State Key Laboratory of Membrane Biology, Laboratory of Molecular Biophysics, School of Life Sciences, Peking University, Beijing, 100871, China.,Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, Boston, MA, 02115, USA
| | - Hang Yin
- State Key Laboratory of Membrane Biology, Laboratory of Molecular Biophysics, School of Life Sciences, Peking University, Beijing, 100871, China.,Department of Medicinal Chemistry and Molecular Pharmacology, Purdue University, West Lafayette, IN, 47907, USA
| | - Siying Qin
- State Key Laboratory of Membrane Biology, Laboratory of Molecular Biophysics, School of Life Sciences, Peking University, Beijing, 100871, China
| | - Kai Zhang
- National Laboratory of Macromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Yukun Guan
- State Key Laboratory of Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Run Fang
- State Key Laboratory of Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Honglei Wang
- Laboratory of Molecular Modeling and Design, State Key Lab of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Liaoning, 116023, China
| | - Guohui Li
- Laboratory of Molecular Modeling and Design, State Key Lab of Molecular Reaction Dynamics, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Liaoning, 116023, China
| | - Zhengfan Jiang
- State Key Laboratory of Protein and Plant Gene Research, Peking-Tsinghua Center for Life Sciences, College of Life Sciences, Peking University, Beijing, 100871, China
| | - Fei Sun
- National Laboratory of Macromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China
| | - Da-Cheng Wang
- National Laboratory of Macromolecules, Institute of Biophysics, Chinese Academy of Sciences, Beijing, 100101, China.
| | - Can Xie
- State Key Laboratory of Membrane Biology, Laboratory of Molecular Biophysics, School of Life Sciences, Peking University, Beijing, 100871, China. .,High Magnetic Field Laboratory, Key Laboratory of High Magnetic Field and Ion Beam Physical Biology, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, 230031, China.
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27
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Cheng R, Wu Z, Li M, Shao M, Hu T. Interleukin-1β is a potential therapeutic target for periodontitis: a narrative review. Int J Oral Sci 2020; 12:2. [PMID: 31900383 PMCID: PMC6949296 DOI: 10.1038/s41368-019-0068-8] [Citation(s) in RCA: 122] [Impact Index Per Article: 30.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/22/2019] [Revised: 10/07/2019] [Accepted: 10/17/2019] [Indexed: 02/05/2023] Open
Abstract
Interleukin(IL)-1β, a pro-inflammatory cytokine, was elevated and participates in periodontitis. Not only the link between IL-1β and periodontitis was proved by clinical evidence, but also the increased IL-1β triggers a series of inflammatory reactions and promotes bone resorption. Currently, IL-1β blockage has been therapeutic strategies for autoimmune and autoinflammatory diseases such as rheumatoid arthritis, cryopyrin-associated periodic syndromes, gout and type II diabetes mellitus. It is speculated that IL-1β be a potential therapeutic target for periodontitis. The review focuses on the production, mechanism, present treatments and future potential strategies for IL-1β in periodontitis.
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Affiliation(s)
- Ran Cheng
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Zhiwu Wu
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Mingming Li
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Meiying Shao
- West China School of Public Health and West China Fourth Hospital, Sichuan University, Chengdu, China
| | - Tao Hu
- State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & West China Hospital of Stomatology, Sichuan University, Chengdu, China.
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Belibasakis GN, Maula T, Bao K, Lindholm M, Bostanci N, Oscarsson J, Ihalin R, Johansson A. Virulence and Pathogenicity Properties of Aggregatibacter actinomycetemcomitans. Pathogens 2019; 8:E222. [PMID: 31698835 PMCID: PMC6963787 DOI: 10.3390/pathogens8040222] [Citation(s) in RCA: 43] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2019] [Revised: 10/29/2019] [Accepted: 11/04/2019] [Indexed: 02/06/2023] Open
Abstract
Aggregatibacter actinomycetemcomitans is a periodontal pathogen colonizing the oral cavity of a large proportion of the human population. It is equipped with several potent virulence factors that can cause cell death and induce or evade inflammation. Because of the large genetic diversity within the species, both harmless and highly virulent genotypes of the bacterium have emerged. The oral condition and age, as well as the geographic origin of the individual, influence the risk to be colonized by a virulent genotype of the bacterium. In the present review, the virulence and pathogenicity properties of A. actinomycetemcomitans will be addressed.
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Affiliation(s)
- Georgios N. Belibasakis
- Division of Oral Diseases, Department of Dental Medicine, Karolinska Institutet, S-141 04 Huddinge, Sweden; (G.N.B.); (K.B.); (N.B.)
| | - Terhi Maula
- Department of Biochemistry, University of Turku, FI-20014 Turku, Finland; (T.M.); (R.I.)
| | - Kai Bao
- Division of Oral Diseases, Department of Dental Medicine, Karolinska Institutet, S-141 04 Huddinge, Sweden; (G.N.B.); (K.B.); (N.B.)
| | - Mark Lindholm
- Department of Odontology, Umeå University, S-901 87 Umeå, Sweden; (M.L.); (J.O.)
| | - Nagihan Bostanci
- Division of Oral Diseases, Department of Dental Medicine, Karolinska Institutet, S-141 04 Huddinge, Sweden; (G.N.B.); (K.B.); (N.B.)
| | - Jan Oscarsson
- Department of Odontology, Umeå University, S-901 87 Umeå, Sweden; (M.L.); (J.O.)
| | - Riikka Ihalin
- Department of Biochemistry, University of Turku, FI-20014 Turku, Finland; (T.M.); (R.I.)
| | - Anders Johansson
- Department of Odontology, Umeå University, S-901 87 Umeå, Sweden; (M.L.); (J.O.)
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29
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Aral K, Berdeli E, Cooper PR, Milward MR, Kapila Y, Karadede Ünal B, Aral CA, Berdeli A. Differential expression of inflammasome regulatory transcripts in periodontal disease. J Periodontol 2019; 91:606-616. [PMID: 31557327 DOI: 10.1002/jper.19-0222] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2019] [Revised: 07/12/2019] [Accepted: 07/30/2019] [Indexed: 11/08/2022]
Abstract
BACKGROUND The inflammasome modulates the release of key proinflammatory cytokines associated with periodontal disease pathogenesis. The aim of this study was to evaluate the expression of proteins that regulate the inflammasome, namely pyrin domain-only proteins (POPs), caspase activation recruitment domain (CARD)-only proteins, and tripartite motif-containing (TRIM) proteins, in periodontal diseases. METHODS A total of 68 participants (34 males and 34 females) were divided into four groups, including periodontal health (H), gingivitis (G), chronic periodontitis (CP), and aggressive periodontitis (AgP) based on clinical parameters. Gingival tissue samples were obtained from all participants for reverse transcription polymerase chain reaction (RT-PCR)-based gene expression analyses of molecules that regulate the inflammasome, including apoptosis-associated speck-like protein (ASC) containing CARD, caspase-1, interleukin-1β (IL-1β), interleukin-18 (IL-18), nucleotide-binding domain, leucine rich family (NLR) pyrin domain containing 3 (NLRP3), NLR family pyrin domain containing 2 (NLRP2), AIM2 (absent in melanoma 2), POP1, POP2, CARD16, CARD18, TRIM16, and TRIM20 by RT-PCR. RESULTS NLRP3 and IL-1β were upregulated in the G, CP, and AgP groups compared with group H (P < 0.05). AIM2 was downregulated in the CP group compared with the H, G, and AgP groups (P < 0.05). TRIM20, TRIM16, and CARD18 were downregulated in the G, CP, and AgP groups compared with the H group (P < 0.05). POP1 and POP2 were downregulated in the CP and AgP, and AgP and G groups, respectively (P < 0.05). CONCLUSION Active periodontal disease may result in downregulation of inflammasome regulators that may increase the activity of NLRP3 and IL-1β in periodontal disease.
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Affiliation(s)
- Kübra Aral
- Oral Biology, School of Dentistry, University of Birmingham, Birmingham, UK
| | - Eynar Berdeli
- Faculty of Dentistry, Izmir Katip Celebi University, Izmir, Turkey
| | - Paul Roy Cooper
- School of Dentistry, University of Birmingham, Birmingham, UK
| | | | - Yvonne Kapila
- The School of Dentistry, University of California San Francisco, San Francisco, CA, USA
| | | | | | - Afig Berdeli
- Faculty of Medicine, Molecular Medicine Laboratory, Ege University, Izmir, Turkey
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30
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Li C, Yin W, Yu N, Zhang D, Zhao H, Liu J, Liu J, Pan Y, Lin L. miR-155 promotes macrophage pyroptosis induced by Porphyromonas gingivalis through regulating the NLRP3 inflammasome. Oral Dis 2019; 25:2030-2039. [PMID: 31529565 DOI: 10.1111/odi.13198] [Citation(s) in RCA: 35] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2019] [Revised: 07/26/2019] [Accepted: 09/11/2019] [Indexed: 12/14/2022]
Abstract
OBJECTIVE The aim of this study is to detect pyroptosis in macrophages stimulated with Porphyromonas gingivalis and elucidate the mechanism by which P. gingivalis induces pyroptosis in macrophages. METHODS The immortalized human monocyte cell line U937 was stimulated with P. gingivalis W83. Flow cytometry was carried out to detect pyroptosis in macrophages. The expression of miR-155 was detected by real-time PCR and inhibited using RNAi. Suppressor of cytokine signaling (SOCS) 1, cleaved GSDMD, caspase (CAS)-1, caspase-11, apoptosis-associated speck-like protein (ASC), and NOD-like receptor protein 3 (NLRP3) were detected by Western blotting, and IL-1β and IL-18 were detected by ELISA. RESULTS The rate of pyroptosis in macrophages and the expression of miR-155 increased upon stimulation with P. gingivalis and pyroptosis rate decreased when miR-155 was silenced. GSDMD-NT, CAS-11, CAS-1, ASC, NLRP3, IL-1β, and IL-18 levels increased, but SOCS1 decreased in U937 cells after stimulated with P. gingivalis. These changes were weakened in P. gingivalis-stimulated U937 macrophages transfected with lentiviruses carrying miR-155 shRNA compared to those transfected with non-targeting control sequence. However, there was no significant difference in ASC expression between P. gingivalis-stimulated shCont and shMiR-155 cells. CONCLUSIONS Porphyromonas gingivalis promotes pyroptosis in macrophages during early infection. miR-155 is involved in this process through regulating the NLRP3 inflammasome.
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Affiliation(s)
- Chen Li
- Department of Periodontics, School of Stomatology, China Medical University, Shenyang, China
| | - Wanting Yin
- Department of Periodontics, School of Stomatology, China Medical University, Shenyang, China.,MALO CLINIC, Shenyang, China
| | - Ning Yu
- Department of Periodontics and Oral Medicine, University of Michigan at Ann Arbor, MI, USA
| | - Dongmei Zhang
- Department of Periodontics, School of Stomatology, China Medical University, Shenyang, China.,Liaoning Province Key Laboratory of Oral Diseases, Shenyang, China
| | - Haijiao Zhao
- Department of Periodontics, School of Stomatology, China Medical University, Shenyang, China
| | - Jingbo Liu
- Department of Periodontics, School of Stomatology, China Medical University, Shenyang, China
| | - Junchao Liu
- Department of Periodontics, School of Stomatology, China Medical University, Shenyang, China.,Liaoning Province Translational Medicine Research Center of Oral Diseases, Shenyang, China
| | - Yaping Pan
- Department of Periodontics, School of Stomatology, China Medical University, Shenyang, China
| | - Li Lin
- Department of Periodontics, School of Stomatology, China Medical University, Shenyang, China
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31
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Han EC, Choi SY, Lee Y, Park JW, Hong SH, Lee HJ. Extracellular RNAs in periodontopathogenic outer membrane vesicles promote TNF-α production in human macrophages and cross the blood-brain barrier in mice. FASEB J 2019; 33:13412-13422. [PMID: 31545910 DOI: 10.1096/fj.201901575r] [Citation(s) in RCA: 127] [Impact Index Per Article: 25.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Among the main bacteria implicated in the pathology of periodontal disease, Aggregatibacter actinomycetemcomitans (Aa) is well known for causing loss of periodontal attachment and systemic disease. Recent studies have suggested that secreted extracellular RNAs (exRNAs) from several bacteria may be important in periodontitis, although their role is unclear. Emerging evidence indicates that exRNAs circulate in nanosized bilayered and membranous extracellular vesicles (EVs) known as outer membrane vesicles (OMVs) in gram-negative bacteria. In this study, we analyzed the small RNA expression profiles in activated human macrophage-like cells (U937) infected with OMVs from Aa and investigated whether these cells can harbor exRNAs of bacterial origin that have been loaded into the host RNA-induced silencing complex, thus regulating host target transcripts. Our results provide evidence for the cytoplasmic delivery and activity of microbial EV-derived small exRNAs in host gene regulation. The production of TNF-α was promoted by exRNAs via the TLR-8 and NF-κB signaling pathways. Numerous studies have linked periodontal disease to neuroinflammatory diseases but without elucidating specific mechanisms for the connection. We show here that intracardiac injection of Aa OMVs in mice showed successful delivery to the brain after crossing the blood-brain barrier, the exRNA cargos increasing expression of TNF-α in the mouse brain. The current study indicates that host gene regulation by microRNAs originating from OMVs of the periodontal pathogen Aa is a novel mechanism for host gene regulation and that the transfer of OMV exRNAs to the brain may cause neuroinflammatory diseases like Alzheimer's.-Han, E.-C., Choi, S.-Y., Lee, Y., Park, J.-W., Hong, S.-H., Lee, H.-J. Extracellular RNAs in periodontopathogenic outer membrane vesicles promote TNF-α production in human macrophages and cross the blood-brain barrier in mice.
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Affiliation(s)
- Eun-Chong Han
- Department of Microbiology and Immunology, School of Dentistry, Kyungpook National University, Daegu, South Korea
| | - Song-Yi Choi
- Department of Microbiology and Immunology, School of Dentistry, Kyungpook National University, Daegu, South Korea
| | - Youngkyun Lee
- Department of Biochemistry, School of Dentistry, Kyungpook National University, Daegu, South Korea
| | - Jin-Woo Park
- Department of Periodontology, School of Dentistry, Kyungpook National University, Daegu, South Korea
| | - Su-Hyung Hong
- Department of Microbiology and Immunology, School of Dentistry, Kyungpook National University, Daegu, South Korea
| | - Heon-Jin Lee
- Department of Microbiology and Immunology, School of Dentistry, Kyungpook National University, Daegu, South Korea.,Brain Science and Engineering Institute, Kyungpook National University, Daegu, South Korea
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32
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Vega BA, Belinka BA, Kachlany SC. Aggregatibacter actinomycetemcomitans Leukotoxin (LtxA; Leukothera ®): Mechanisms of Action and Therapeutic Applications. Toxins (Basel) 2019; 11:toxins11090489. [PMID: 31454891 PMCID: PMC6784247 DOI: 10.3390/toxins11090489] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2019] [Revised: 08/21/2019] [Accepted: 08/22/2019] [Indexed: 12/18/2022] Open
Abstract
Aggregatibacter actinomycetemcomitans is an oral pathogen that produces the RTX toxin, leukotoxin (LtxA; Leukothera®). A. actinomycetemcomitans is strongly associated with the development of localized aggressive periodontitis. LtxA acts as a virulence factor for A. actinomycetemcomitans to subvert the host immune response by binding to the β2 integrin lymphocyte function-associated antigen-1 (LFA-1; CD11a/CD18) on white blood cells (WBCs), causing cell death. In this paper, we reviewed the state of knowledge on LtxA interaction with WBCs and the subsequent mechanisms of induced cell death. Finally, we touched on the potential therapeutic applications of LtxA (trade name Leukothera®) toxin therapy for the treatment of hematological malignancies and immune-mediated diseases.
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Affiliation(s)
- Brian A Vega
- Department of Oral Biology, Rutgers School of Dental Medicine, Newark, NJ 07103, USA
- Actinobac Biomed, Inc., Princeton, NJ 08540, USA
| | | | - Scott C Kachlany
- Department of Oral Biology, Rutgers School of Dental Medicine, Newark, NJ 07103, USA.
- Actinobac Biomed, Inc., Princeton, NJ 08540, USA.
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Zhou X, Zhang P, Wang Q, Ji N, Xia S, Ding Y, Wang Q. Metformin ameliorates experimental diabetic periodontitis independently of mammalian target of rapamycin (mTOR) inhibition by reducing NIMA‐related kinase 7 (Nek7) expression. J Periodontol 2019; 90:1032-1042. [PMID: 30945296 DOI: 10.1002/jper.18-0528] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/10/2018] [Revised: 01/25/2019] [Accepted: 01/25/2019] [Indexed: 12/16/2022]
Affiliation(s)
- Xinyi Zhou
- State Key Laboratory of Oral DiseasesNational Clinical Research Center for Oral DiseasesDepartment of ProsthodonticsWest China Hospital of StomatologySichuan University Chengdu China
| | - Peng Zhang
- State Key Laboratory of Oral DiseasesNational Clinical Research Center for Oral DiseasesDepartment of ProsthodonticsWest China Hospital of StomatologySichuan University Chengdu China
| | - Qian Wang
- State Key Laboratory of Oral DiseasesNational Clinical Research Center for Oral DiseasesDepartment of ProsthodonticsWest China Hospital of StomatologySichuan University Chengdu China
| | - Ning Ji
- State Key Laboratory of Oral DiseasesNational Clinical Research Center for Oral DiseasesDepartment of ProsthodonticsWest China Hospital of StomatologySichuan University Chengdu China
| | - Sisi Xia
- State Key Laboratory of Oral DiseasesNational Clinical Research Center for Oral DiseasesDepartment of ProsthodonticsWest China Hospital of StomatologySichuan University Chengdu China
| | - Yi Ding
- State Key Laboratory of Oral DiseasesNational Clinical Research Center for Oral DiseasesDepartment of ProsthodonticsWest China Hospital of StomatologySichuan University Chengdu China
| | - Qi Wang
- State Key Laboratory of Oral DiseasesNational Clinical Research Center for Oral DiseasesDepartment of ProsthodonticsWest China Hospital of StomatologySichuan University Chengdu China
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Lv K, Wang G, Shen C, Zhang X, Yao H. Role and mechanism of the nod-like receptor family pyrin domain-containing 3 inflammasome in oral disease. Arch Oral Biol 2018; 97:1-11. [PMID: 30315987 DOI: 10.1016/j.archoralbio.2018.10.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 10/02/2018] [Accepted: 10/03/2018] [Indexed: 12/13/2022]
Abstract
OBJECTIVE To summarize evidence and data from experimental studies regarding the role and mechanism of the Nod-like receptor family pyrin domain-containing 3 (NLRP3) inflammasome in the pathogenesis of several representative oral diseases. MATERIALS AND METHODS A literature search of PubMed and EBSCO was performed. The literature was searched using a combination of keywords, e.g., NLRP3 inflammasome, inflammation, microorganisms, oral inflammatory diseases, and oral immunological diseases. RESULTS The initiation and activation of the NLRP3 inflammasome are associated with the pathogenesis and progression of several representative oral diseases, including periodontitis, oral lichen planus, dental pulp disease, and oral cavity squamous cell carcinoma. CONCLUSIONS The NLRP3 inflammasome plays a crucial role in the progression of inflammatory and adaptive immune responses. The possible role of the NLRP3 inflammasome in several oral diseases, including not only periodontitis and pulpitis but also mucosal diseases and oral cavity squamous cell carcinoma, may involve the aberrant regulation of inflammatory and immune responses. Understanding the cellular and molecular biology of the NLRP3 inflammasome is necessary because the NLRP3 inflammasome may be a potential therapeutic target for the treatment and prevention of oral inflammatory and immunological diseases.
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Affiliation(s)
- Kejia Lv
- Department of Stomatology, First Affiliated Hospital, College of Medicine, Zhejiang University, China
| | - Guohua Wang
- Department of Stomatology, First Affiliated Hospital, College of Medicine, Zhejiang University, China
| | - Chenlu Shen
- Department of Stomatology, First Affiliated Hospital, College of Medicine, Zhejiang University, China
| | - Xia Zhang
- Department of Stomatology, Affiliated Yinzhou People Hospital, College of Medicine, Ningbo University, China
| | - Hua Yao
- Department of Stomatology, First Affiliated Hospital, College of Medicine, Zhejiang University, China.
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Hasebe A, Saeki A, Yoshida Y, Shibata KI. Differences in interleukin-1β release-inducing activity of Candida albicans toward dendritic cells and macrophages. Arch Oral Biol 2018; 93:115-125. [PMID: 29894908 DOI: 10.1016/j.archoralbio.2018.06.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2018] [Revised: 06/01/2018] [Accepted: 06/02/2018] [Indexed: 10/14/2022]
Abstract
OBJECTIVE The purpose of this study is to elucidate differences in the mechanism of the IL-1β release-inducing activity of Candida albicans toward dendritic cells and macrophages because IL-1β is one of the proinflammatory cytokines which is crucial in host defense against candidiasis. DESIGN Two C. albicans strains were used in this study. One strain is uridine-auxotrophic (CAI4) that needs uridine to grow and form hyphae, and another is a strain without any specific auxotrophy (pACT1-GFP), which forms hyphae naturally by culturing with serum components. Murine macrophage and dendritic cell lines were primed with LPS and then stimulated with C. albicans CAI4 or pACT1-GFP. RESULTS Both strains of C. albicans induced IL-1β release from dendritic cells, and C. albicans pACT1-GFP induced IL-1β release but CAI4 induced little amounts in macrophages. These differences were suggested to be due to the difference in the amount of extracellular ATP released in the cell culture supernatants induced by C. albicans CAI4 or pACT1-GFP. For induction of IL-1β release from both macrophages and dendritic cells by C. albicans, direct contacts of the microbes with cells were required. In addition, macrophages required morphological change of C. albicans from yeast to hyphae for induction of IL-1β release, whereas dendritic cells did not require it. Dead C. albicans could induce IL-1β release from dendritic cells, but could not from macrophages. CONCLUSIONS There are different mechanisms by which C. albicans induces IL-1β release from dendritic cells and macrophages.
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Affiliation(s)
- Akira Hasebe
- Departments of Oral Molecular Microbiology, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan
| | - Ayumi Saeki
- Departments of Oral Molecular Microbiology, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan
| | - Yasuhiro Yoshida
- Departments of Biomaterials and Bioengineering, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan
| | - Ken-Ichiro Shibata
- Departments of Oral Molecular Microbiology, Faculty of Dental Medicine and Graduate School of Dental Medicine, Hokkaido University, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan.
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Shibata K. Historical aspects of studies on roles of the inflammasome in the pathogenesis of periodontal diseases. Mol Oral Microbiol 2018; 33:203-211. [DOI: 10.1111/omi.12217] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/18/2018] [Indexed: 12/15/2022]
Affiliation(s)
- K. Shibata
- Department of Oral Molecular Microbiology; Faculty of Dental Medicine and Graduate School of Dental Medicine; Hokkaido University; Hokkaido Japan
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Bullon P, Pavillard LE, de la Torre-Torres R. Inflammasome and Oral Diseases. EXPERIENTIA SUPPLEMENTUM (2012) 2018; 108:153-176. [PMID: 30536171 DOI: 10.1007/978-3-319-89390-7_7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
One of the main steps in the development of the life in the earth is multicellularity. It enables cell differentiation and the development of morphological structures within an organism and is an essential factor in how to recognize friendly cells that are part of the multicellular organism and which foreign organisms can be harmful. Recognition includes devices such as the major histocompatibility complex (MHC), and the pattern recognition receptors (PRRs). PRRs are a group of proteins expressed by cells of the innate immune system that identify two classes of products: pathogen-associated molecular patterns (PAMPs), related to microbial pathogens, and damage-associated molecular patterns (DAMPs), associated with cell components that are released during cell damage or death. All these activate the inflammasome, which is a multiprotein oligomer that includes caspase 1, PYCARD, NALP, and caspase 5 (also known as caspase 11 or ICH-3). It is responsible for activation of inflammatory processes and has been shown to induce cell pyroptosis, a programmed cell death distinct from apoptosis, and promotes the maturation of the inflammatory cytokines interleukin 1β (IL-1β) and interleukin 18 (IL-18). We review whether inflammasome is related to diseases that can occur in the oral cavity. The mouth is always a possible environment for the development of pathological conditions because of the wide variety of microorganisms. Small variations in the equilibrium of the oral flora can cause disorders that could affect the organism in a systemic form. We provide data on periodontal disease, candidiasis, herpes virus, oral cancer, caries, and other oral diseases. There are very few papers that study this issue; therefore, we need more investigation and publications about inflammatory molecular processes, and more specifically, related to the inflammasome complex.
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Affiliation(s)
- Pedro Bullon
- Departament Periodontology, Facultad de Odontología, Universidad de Sevilla, Sevilla, Spain.
| | - Luis E Pavillard
- Departament Periodontology, Facultad de Odontología, Universidad de Sevilla, Sevilla, Spain
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38
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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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Lee SJ, Choi BK. Involvement of NLRP10 in IL-1α induction of oral epithelial cells by periodontal pathogens. Innate Immun 2017; 23:569-577. [PMID: 28766990 DOI: 10.1177/1753425917722610] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022] Open
Abstract
This study investigated the pathogenesis of periodontitis and the role of nucleotide-binding oligomerization domain-like receptor protein 10 (NLRP10). The human oral epithelial cell line HOK-16B was infected with two periodontal pathogens, Tannerella forsythia and Fusobacterium nucleatum, at various MOIs. RT-PCR and immunoblotting demonstrated that infection increased mRNA and protein expression of NLRP10, respectively. The siRNA-mediated NLRP10 knockdown significantly reduced IL-1α expression and secretion. Both bacteria induced phosphorylation of ERK, JNK and p38 MAP kinases in HOK-16B cells. NLRP10 knockdown impaired ERK phosphorylation only. ERK inhibition significantly decreased the expression of T. forsythia- and F. nucleatum-induced IL-1α. Our data suggest that NLRP10 is involved in activating the ERK signalling pathway in HOK-16B cells infected with T. forsythia and F. nucleatum. This pathway likely augments the pro-inflammatory cytokine IL-1α levels, which may play a critical role in periodontitis.
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Affiliation(s)
- Seok-Joo Lee
- 1 Department of Oral Microbiology and Immunology, School of Dentistry, Seoul National University, Seoul, Korea
| | - Bong-Kyu Choi
- 1 Department of Oral Microbiology and Immunology, School of Dentistry, Seoul National University, Seoul, Korea
- 2 Dental Research Institute, Seoul National University, Seoul, Korea
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Isaza-Guzmán DM, Medina-Piedrahíta VM, Gutiérrez-Henao C, Tobón-Arroyave SI. Salivary Levels of NLRP3 Inflammasome-Related Proteins as Potential Biomarkers of Periodontal Clinical Status. J Periodontol 2017; 88:1329-1338. [PMID: 28691886 DOI: 10.1902/jop.2017.170244] [Citation(s) in RCA: 48] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
BACKGROUND Emerging evidence suggests that activation of inflammasomes plays a central mechanism in pathogenesis of periodontitis. This study aims to compare salivary levels of nod-like receptor family pyrin domain containing protein (NLRP) 3, apoptosis-associated speck-like protein containing a caspase recruitment domain (ASC), cysteine aspartase (caspase)-1, and interleukin (IL)-1β from individuals with aggressive (AgP) or chronic periodontitis (CP) and healthy controls (HC), as well as elucidate its association with periodontal clinical status. METHODS Saliva samples from individuals with CP (n = 75), AgP (n = 20), and HC (n = 69) were collected. Periodontal status was assessed by measurement of probing depth, clinical attachment level, and extent and severity of disease. Salivary levels of analytes were analyzed by enzyme-linked immunosorbent assay. Association between biomarkers with CP or AgP was analyzed using multivariate binary logistic regression models. RESULTS Significantly higher levels of NLRP3, ASC, and IL-1β were detected in periodontitis groups in comparison to the periodontally HC group. However, no significant differences were observed for caspase-1 levels between clinical groups, and only NLRP3 salivary concentration was significantly higher in AgP compared with CP patients. Also, positive significant correlations among NLRP3, ASC, and IL-1β salivary concentrations and clinical parameters were observed. Logistic regression analyses revealed a strong/independent association of NLRP3, ASC, and IL-1β salivary levels with CP and AgP. CONCLUSION Although the concentration of caspase-1 in saliva samples makes its determination useless for detection of periodontal disease and/or its severity, salivary levels of NLRP3, ASC, and IL-1β may act as strong/independent indicators of amount and extent of periodontal breakdown in both CP and AgP and could potentially be used for prevention and therapy of this group of diseases.
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Affiliation(s)
- Diana M Isaza-Guzmán
- Laboratory of Immunodetection and Bioanalysis, Faculty of Dentistry, University of Antioquia, Medellín, Colombia
| | - Verónica M Medina-Piedrahíta
- Laboratory of Immunodetection and Bioanalysis, Faculty of Dentistry, University of Antioquia, Medellín, Colombia
| | - Carolina Gutiérrez-Henao
- Laboratory of Immunodetection and Bioanalysis, Faculty of Dentistry, University of Antioquia, Medellín, Colombia
| | - Sergio I Tobón-Arroyave
- Laboratory of Immunodetection and Bioanalysis, Faculty of Dentistry, University of Antioquia, Medellín, Colombia
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Yoshida K, Okamura H, Hiroshima Y, Abe K, Kido JI, Shinohara Y, Ozaki K. PKR induces the expression of NLRP3 by regulating the NF-κB pathway in Porphyromonas gingivalis-infected osteoblasts. Exp Cell Res 2017; 354:57-64. [PMID: 28341446 DOI: 10.1016/j.yexcr.2017.03.028] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2017] [Revised: 03/10/2017] [Accepted: 03/14/2017] [Indexed: 12/11/2022]
Abstract
The double-stranded RNA-dependent kinase (PKR), which is activated by double stranded RNA, induces inflammation by regulating NF-κB signaling. The NLR family pyrin domain-containing 3 (NLRP3) inflammasome also modulates inflammation in response to infection. Porphyromonas gingivalis (P.gingivalis) is an oral bacterium which is implicated in the pathogenesis of periodontal diseases. We previously reported that PKR is a key modulator of bone metabolism and inflammation in the periodontal tissue. PKR was also reported to induce inflammation in response to microbes by regulating the NLRP3 inflammasome, suggesting that PKR could affect inflammation along with NLRP3 in periodontal diseases. In this study, we investigated the effects of PKR on NLRP3 expression and NF-κB activity in P. gingivalis infected osteoblasts. We first constructed a SNAP26b-tagged P.gingivalis (SNAP-P. g.) and traced its internalization into the cell. SNAP-P. g. increased the activity of PKR and NF-κB and also induced NLRP3 expression in osteoblasts. Inhibition of NF-κB attenuated SNAP-P. g.-induced NLRP3 expression. The knockdown of PKR using shRNA decreased both the activity of NF-κB and the expression of NLRP3 induced by SNAP-P.g.. We therefore concluded that in osteoblasts, P. gingivalis activated PKR, which in turn increased NLRP3 expression by activating NF-κB. Our results suggest that PKR modulates inflammation by regulating the expression of the NLRP3 inflammasome through the NF-κB pathway in periodontal diseases.
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Affiliation(s)
- Kaya Yoshida
- Department of Oral Healthcare Education, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto, Tokushima 770-8504, Japan.
| | - Hirohiko Okamura
- Department of Histology and Oral Histology, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto, Tokushima 770-8504, Japan; Department of Oral Morphology, Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama University, 2-5-1 Shikata, Kita-ku, Okayama 770-8525, Japan
| | - Yuka Hiroshima
- Institute for Genome Research, Tokushima University, 3-18-15 Kuramoto, Tokushima 770-8503, Japan
| | - Kaori Abe
- SHIBASAKI, Inc., 507 Horikiri, Chichibu 368-0066, Japan
| | - Jun-Ichi Kido
- Department of Periodontology and Endodontology, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto, Tokushima 770-8504, Japan
| | - Yasuo Shinohara
- Institute for Genome Research, Tokushima University, 3-18-15 Kuramoto, Tokushima 770-8503, Japan
| | - Kazumi Ozaki
- Oral Healthcare Promotion, Institute of Biomedical Sciences, Tokushima University Graduate School, 3-18-15 Kuramoto, Tokushima 770-8504, Japan
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Yilmaz Ö, Lee KL. The inflammasome and danger molecule signaling: at the crossroads of inflammation and pathogen persistence in the oral cavity. Periodontol 2000 2017; 69:83-95. [PMID: 26252403 DOI: 10.1111/prd.12084] [Citation(s) in RCA: 40] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 09/10/2014] [Indexed: 12/27/2022]
Abstract
Inflammasomes are an oligomeric assembly of multiprotein complexes that activate the caspase-1-dependent maturation and the subsequent secretion of inflammatory interleukin-1beta and interleukin-18 cytokines in response to a 'danger signal' in vertebrates. The assessment of their significance continues to grow rapidly as the complex biology of various chronic inflammatory conditions is better dissected. Increasing evidence strongly links inflammasomes and host-derived small 'danger molecule ATP' signaling with the modulation of the host immune response by microbial colonizers as well as with potential altering of the microbiome structure and intermicrobial interactions in the host. All of these factors eventually lead to the destructive chronic inflammatory disease state. In the oral cavity, a highly dynamic and multifaceted interplay takes place between the signaling of endogenous danger molecules and colonizing microbes on the mucosal surfaces. This interaction may redirect the local microenvironment to favor the conversion of the resident microbiome toward pathogenicity. This review outlines the major components of the known inflammasome complexes/mechanisms and highlights their regulation, in particular, by oral microorganisms, in relation to periodontal disease pathology. Better characterization of the cellular and molecular biology of the inflammasome will probably identify important potential therapeutic targets for the treatment and prevention of periodontal disease, as well as for other debilitating chronic diseases.
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43
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Scuron MD, Boesze-Battaglia K, Dlakić M, Shenker BJ. The Cytolethal Distending Toxin Contributes to Microbial Virulence and Disease Pathogenesis by Acting As a Tri-Perditious Toxin. Front Cell Infect Microbiol 2016; 6:168. [PMID: 27995094 PMCID: PMC5136569 DOI: 10.3389/fcimb.2016.00168] [Citation(s) in RCA: 52] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 11/15/2016] [Indexed: 12/11/2022] Open
Abstract
This review summarizes the current status and recent advances in our understanding of the role that the cytolethal distending toxin (Cdt) plays as a virulence factor in promoting disease by toxin-producing pathogens. A major focus of this review is on the relationship between structure and function of the individual subunits that comprise the AB2 Cdt holotoxin. In particular, we concentrate on the molecular mechanisms that characterize this toxin and which account for the ability of Cdt to intoxicate multiple cell types by utilizing a ubiquitous binding partner on the cell membrane. Furthermore, we propose a paradigm shift for the molecular mode of action by which the active Cdt subunit, CdtB, is able to block a key signaling cascade and thereby lead to outcomes based upon programming and the role of the phosphatidylinositol 3-kinase (PI-3K) in a variety of cells. Based upon the collective Cdt literature, we now propose that Cdt is a unique and potent virulence factor capable of acting as a tri-perditious toxin that impairs host defenses by: (1) disrupting epithelial barriers; (2) suppressing acquired immunity; (3) promoting pro-inflammatory responses. Thus, Cdt plays a key role in facilitating the early stages of infection and the later stages of disease progression by contributing to persistence and impairing host elimination.
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Affiliation(s)
- Monika D Scuron
- Department of Pathology, School of Dental Medicine, University of Pennsylvania Philadelphia, PA, USA
| | - Kathleen Boesze-Battaglia
- Department of Biochemistry, School of Dental Medicine, University of Pennsylvania Philadelphia, PA, USA
| | - Mensur Dlakić
- Department of Microbiology and Immunology, Montana State University Bozeman, MT, USA
| | - Bruce J Shenker
- Department of Pathology, School of Dental Medicine, University of Pennsylvania Philadelphia, PA, USA
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Kim YG, Kim M, Kang JH, Kim HJ, Park JW, Lee JM, Suh JY, Kim JY, Lee JH, Lee Y. Transcriptome sequencing of gingival biopsies from chronic periodontitis patients reveals novel gene expression and splicing patterns. Hum Genomics 2016; 10:28. [PMID: 27531006 PMCID: PMC4988046 DOI: 10.1186/s40246-016-0084-0] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2016] [Accepted: 08/04/2016] [Indexed: 12/30/2022] Open
Abstract
BACKGROUND Periodontitis is the most common chronic inflammatory disease caused by complex interaction between the microbial biofilm and host immune responses. In the present study, high-throughput RNA sequencing was utilized to systemically and precisely identify gene expression profiles and alternative splicing. METHODS The pooled RNAs of 10 gingival tissues from both healthy and periodontitis patients were analyzed by deep sequencing followed by computational annotation and quantification of mRNA structures. RESULTS The differential expression analysis designated 400 up-regulated genes in periodontitis tissues especially in the pathways of defense/immunity protein, receptor, protease, and signaling molecules. The top 10 most up-regulated genes were CSF3, MAFA, CR2, GLDC, SAA1, LBP, MME, MMP3, MME-AS1, and SAA4. The 62 down-regulated genes in periodontitis were mainly cytoskeletal and structural proteins. The top 10 most down-regulated genes were SERPINA12, MT4, H19, KRT2, DSC1, PSORS1C2, KRT27, LCE3C, AQ5, and LCE6A. The differential alternative splicing analysis revealed unique transcription variants in periodontitis tissues. The EDB exon was predominantly included in FN1, while exon 2 was mostly skipped in BCL2A1. CONCLUSIONS These findings using RNA sequencing provide novel insights into the pathogenesis mechanism of periodontitis in terms of gene expression and alternative splicing.
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Affiliation(s)
- Yong-Gun Kim
- Department of Periodontology, School of Dentistry, Kyungpook National University, Daegu, 41940, Korea.,Institute for Hard Tissue and Bone Regeneration, Kyungpook National University, Daegu, 41940, Korea
| | - Minjung Kim
- Department of Life and Nanopharmaceutical Sciences, Kyung Hee University, Seoul, 02447, Korea
| | - Ji Hyun Kang
- Department of Biochemistry, School of Dentistry, Kyungpook National University, 2177 Dalgubeol-daero, Joong-gu, Daegu, 41940, Korea
| | - Hyo Jeong Kim
- Department of Biochemistry, School of Dentistry, Kyungpook National University, 2177 Dalgubeol-daero, Joong-gu, Daegu, 41940, Korea
| | - Jin-Woo Park
- Department of Periodontology, School of Dentistry, Kyungpook National University, Daegu, 41940, Korea
| | - Jae-Mok Lee
- Department of Periodontology, School of Dentistry, Kyungpook National University, Daegu, 41940, Korea
| | - Jo-Young Suh
- Department of Periodontology, School of Dentistry, Kyungpook National University, Daegu, 41940, Korea
| | - Jae-Young Kim
- Institute for Hard Tissue and Bone Regeneration, Kyungpook National University, Daegu, 41940, Korea.,Department of Biochemistry, School of Dentistry, Kyungpook National University, 2177 Dalgubeol-daero, Joong-gu, Daegu, 41940, Korea
| | - Jae-Hyung Lee
- Department of Life and Nanopharmaceutical Sciences, Kyung Hee University, Seoul, 02447, Korea. .,Department of Maxillofacial Biomedical Engineering, School of Dentistry, Kyung Hee University, 26 Kyunghee-daero, Dongdaemun-gu, Seoul, 02447, Korea.
| | - Youngkyun Lee
- Institute for Hard Tissue and Bone Regeneration, Kyungpook National University, Daegu, 41940, Korea. .,Department of Biochemistry, School of Dentistry, Kyungpook National University, 2177 Dalgubeol-daero, Joong-gu, Daegu, 41940, Korea.
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45
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Kim S, Park MH, Song YR, Na HS, Chung J. Aggregatibacteractinomycetemcomitans-Induced AIM2 Inflammasome Activation Is Suppressed by Xylitol in Differentiated THP-1 Macrophages. J Periodontol 2016; 87:e116-26. [DOI: 10.1902/jop.2016.150477] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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46
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Determination of NLRP3 (rs4612666) and IL-1B (rs1143634) genetic polymorphisms in periodontally diseased and healthy subjects. Arch Oral Biol 2016; 65:44-51. [DOI: 10.1016/j.archoralbio.2016.01.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2015] [Revised: 12/26/2015] [Accepted: 01/24/2016] [Indexed: 01/01/2023]
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47
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Tan HY, Yong YK, Shankar EM, Paukovics G, Ellegård R, Larsson M, Kamarulzaman A, French MA, Crowe SM. Aberrant Inflammasome Activation Characterizes Tuberculosis-Associated Immune Reconstitution Inflammatory Syndrome. THE JOURNAL OF IMMUNOLOGY 2016; 196:4052-63. [DOI: 10.4049/jimmunol.1502203] [Citation(s) in RCA: 56] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 03/13/2016] [Indexed: 12/31/2022]
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48
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Pettersson M, Kelk P, Belibasakis GN, Bylund D, Molin Thorén M, Johansson A. Titanium ions form particles that activate and execute interleukin-1β release from lipopolysaccharide-primed macrophages. J Periodontal Res 2016; 52:21-32. [PMID: 26987886 PMCID: PMC5297875 DOI: 10.1111/jre.12364] [Citation(s) in RCA: 113] [Impact Index Per Article: 14.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/18/2015] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND OBJECTIVE Peri-implantitis is a destructive inflammatory process characterized by destruction of the implant-supporting bone. Inflammasomes are large intracellular multiprotein complexes that play a central role in innate immunity by activating the release of proinflammatory cytokines. Although inflammasome activation has previously been linked to periodontal inflammation, there is still no information on a potential association with peri-implantitis. The aim of this study was to examine cytotoxic and proinflammatory effects, including inflammasome activation, of metals used in dental implants, in an in vitro model, as well as from clinical tissue samples. MATERIAL AND METHODS Human macrophages were exposed to different metals [titanium (Ti), cobalt, chromium and molybdenum] in a cell-culture assay. Cytotoxicity was determined using the neutral red uptake assay. Cytokine secretion was quantified using an ELISA, and the expression of genes of various inflammasome components was analysed using quantitative PCR. In addition, the concentrations of interleukin-1β (IL-1β) and Ti in mucosal tissue samples taken in the vicinity of dental implants were determined using ELISA and inductively coupled plasma mass spectrometry, respectively. RESULTS Ti ions in physiological solutions stimulated inflammasome activation in human macrophages and consequently IL-1β release. This effect was further enhanced by macrophages that have been exposed to lipopolysaccharides. The proinflammatory activation caused by Ti ions disappeared after filtration (0.22 μm), which indicates an effect of particles. Ti ions alone did not stimulate transcription of the inflammasome components. The Ti levels of tissue samples obtained in the vicinity of Ti implants were sufficiently high (≥ 40 μm) to stimulate secretion of IL-1β from human macrophages in vitro. CONCLUSION Ti ions form particles that act as secondary stimuli for a proinflammatory reaction.
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Affiliation(s)
- M Pettersson
- Prosthetic Dentistry, Department of Odontology, Faculty of Medicine, Umeå University, Umeå, Sweden
| | - P Kelk
- Department of Integrative Medical Biology, Faculty of Medicine, Umeå University, Umeå, Sweden
| | - G N Belibasakis
- Section of Oral Microbiology and Immunology, Institute of Oral Biology, Center of Dental Medicine, University of Zürich, Zürich, Switzerland
| | - D Bylund
- Department of Natural Sciences, Mid Sweden University, Sundsvall, Sweden
| | - M Molin Thorén
- Prosthetic Dentistry, Department of Odontology, Faculty of Medicine, Umeå University, Umeå, Sweden
| | - A Johansson
- Molecular Periodontology, Department of Odontology, Faculty of Medicine, Umeå University, Umeå, Sweden
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Ebersole JL, Kirakodu S, Novak MJ, Exposto CR, Stromberg AJ, Shen S, Orraca L, Gonzalez-Martinez J, Gonzalez OA. Effects of aging in the expression of NOD-like receptors and inflammasome-related genes in oral mucosa. Mol Oral Microbiol 2016; 31:18-32. [PMID: 26197995 PMCID: PMC4712099 DOI: 10.1111/omi.12121] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/16/2015] [Indexed: 01/28/2023]
Abstract
The molecular changes underlying the higher risk of chronic inflammatory disorders during aging remain incompletely understood. Molecular variations in the innate immune response related to recognition and interaction with microbes at mucosal surfaces could be involved in aging-related inflammation. We developed an ontology analysis of 20 nucleotide-binding and oligomerization domain (NOD)-like receptors (NLRs) and seven inflammasome-related genes (IRGs) in healthy and inflamed/periodontitis oral mucosal tissues from young, adolescent, adult, and aged non-human primates (Macaca mulatta) using the GeneChip(®) Rhesus Macaque Genome array. Validation of some of the significant changes was done by quantitative reverse transcription-polymerase chain reaction. The expression of NLRB/NAIP, NLRP12, and AIM2 increased with aging in healthy mucosa whereas NLRC2/NOD2 expression decreased. Although higher expression levels of some NLRs were generally observed with periodontitis in adult mucosal tissues (e.g. NLRB/NAIP, NLRP5, and NLRX1), various receptors (e.g. NLRC2/NOD2 and NLRP2) and the inflammasome adaptor protein ASC, exhibited a significant reduction in expression in aged periodontitis tissues. Accordingly, the expression of NLR-activated innate immune genes, such as HBD3 and IFNB1, was impaired in aged but not adult periodontitis tissues. Both adult and aged tissues showed significant increase in interleukin-1β expression. These findings suggest that the expression of a subset of NLRs appears to change with aging in healthy oral mucosa, and that aging-related oral mucosal inflammation could involve an impaired regulation of the inflammatory and antimicrobial response associated with downregulation of specific NLRs and IRGs.
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Affiliation(s)
- Jeffrey L. Ebersole
- Center for Oral Health Research, College of Dentistry, University of Kentucky, Lexington, KY, USA
| | - Sreenatha Kirakodu
- Center for Oral Health Research, College of Dentistry, University of Kentucky, Lexington, KY, USA
| | - M. John Novak
- Center for Oral Health Research, College of Dentistry, University of Kentucky, Lexington, KY, USA
| | - Cristina R. Exposto
- Center for Oral Health Research, College of Dentistry, University of Kentucky, Lexington, KY, USA
| | - Arnold J. Stromberg
- Department of Statistics, College of Arts and Sciences, University of Kentucky, Lexington, KY, USA
| | - Shu Shen
- Department of Statistics, College of Arts and Sciences, University of Kentucky, Lexington, KY, USA
| | - Luis Orraca
- School of Dental Medicine, University of Puerto Rico, San Juan, PR
| | | | - Octavio A. Gonzalez
- Center for Oral Health Research, College of Dentistry, University of Kentucky, Lexington, KY, USA
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Åberg CH, Kelk P, Johansson A. Aggregatibacter actinomycetemcomitans: virulence of its leukotoxin and association with aggressive periodontitis. Virulence 2016; 6:188-95. [PMID: 25494963 PMCID: PMC4601274 DOI: 10.4161/21505594.2014.982428] [Citation(s) in RCA: 107] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Periodontitis is an infection-induced inflammatory disease that causes loss of the tooth supporting tissues. Much focus has been put on comparison of the microbial biofilm in the healthy periodontium with the diseased one. The information arising from such studies is limited due to difficulties to compare the microbial composition in these two completely different ecological niches. A few longitudinal studies have contributed with information that makes it possible to predict which individuals who might have an increased risk of developing aggressive forms of periodontitis, and the predictors are either microbial or/and host-derived factors. The most conspicuous condition that is associated with disease risk is the presence of Aggregatibacter actinomycetemcomitans at the individual level. This Gram-negative bacterium has a great genetic variation with a number of virulence factors. In this review we focus in particular on the leukotoxin that, based on resent knowledge, might be one of the most important virulence factors of A. actinomycetemcomitans.
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Affiliation(s)
- Carola Höglund Åberg
- a Division of Molecular Periodontology; Department of Odontology; Faculty of Medicine; Umeå University ; Umeå , Sweden
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