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Abstract
Periodontitis is among most common human inflammatory diseases and characterized by destruction of tooth-supporting tissues that will eventually lead to tooth loss. Diabetes mellitus (DM) is a group of metabolic disorders characterized by chronic hyperglycemia which results from defects in insulin secretion and/or insulin resistance. Numerous studies have provided evidence for the inter-relationship between DM and periodontitis that has been considered as the sixth most frequent complication of DM. However, the mechanisms are not fully understood yet. The impact of DM on periodontitis through hyperglycemia and inflammatory pathways is well described, but the effects of DM on oral microbiota remain controversial according to previous studies. Recent studies using next-generation sequencing technology indicate that DM can alter the biodiversity and composition of oral microbiome especially subgingival microbiome. This may be another mechanism by which DM risks or aggravates periodontitis. Thus, to understand the role of oral microbiome in periodontitis of diabetics and the mechanism of shifts of oral microbiome under DM would be valuable for making specific therapeutic regimens for treating periodontitis patients with DM or preventing diabetic patients from periodontitis. This article reviews the role of oral microbiome in periodontal health (symbiosis) and disease (dysbiosis), highlights the oral microbial shifts under DM and summarizes the mechanism of the shifts.
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Affiliation(s)
- Han Qin
- College of Stomatology, Chongqing Medical University, Chongqing, Unknown, China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, Unknown, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, Unknown, China
| | - Guangyue Li
- College of Stomatology, Chongqing Medical University, Chongqing, Unknown, China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, Unknown, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, Unknown, China
| | - Xiaohui Xu
- College of Stomatology, Chongqing Medical University, Chongqing, Unknown, China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, Unknown, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, Unknown, China
| | - Chuangwei Zhang
- College of Stomatology, Chongqing Medical University, Chongqing, Unknown, China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, Unknown, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, Unknown, China
| | - Wenjie Zhong
- College of Stomatology, Chongqing Medical University, Chongqing, Unknown, China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, Unknown, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, Unknown, China
| | - Shihan Xu
- College of Stomatology, Chongqing Medical University, Chongqing, Unknown, China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, Unknown, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, Unknown, China
| | - Yuanyuan Yin
- College of Stomatology, Chongqing Medical University, Chongqing, Unknown, China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, Unknown, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, Unknown, China
| | - Jinlin Song
- College of Stomatology, Chongqing Medical University, Chongqing, Unknown, China
- Chongqing Key Laboratory of Oral Diseases and Biomedical Sciences, Chongqing, Unknown, China
- Chongqing Municipal Key Laboratory of Oral Biomedical Engineering of Higher Education, Chongqing, Unknown, China
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Wang Q, Lin W, Zhou X, Lei K, Xu R, Zhang X, Xiong Q, Sheng R, Song W, Liu W, Wang Q, Yuan Q. Single-Cell Transcriptomic Atlas of Gingival Mucosa in Type 2 Diabetes. J Dent Res 2022; 101:1654-1664. [PMID: 35656582 DOI: 10.1177/00220345221092752] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
The oral gingival barrier is a constantly stimulated and dynamic environment where homeostasis is often disrupted, resulting in inflammatory periodontal diseases. Type 2 diabetes (T2D) has been reported to be associated with gingival barrier dysfunction, but the effect and underlying mechanism are inconclusive. Herein, we performed single-cell RNA sequencing (scRNA-seq) of gingiva from leptin receptor-deficient mice (db/db) to examine the gingival heterogeneity in the context of T2D. Periodontal health of control mice is characterized by populations of Krt14+-expressing epithelial cells and Col1a1+-fibroblasts mediating immune homeostasis primarily through the enrichment of innate lymphoid cells. The db/db gingiva exhibited decreased epithelial/stromal ratio and dysfunctional barrier. We further observed stromal, particularly fibroblast immune hyperresponsiveness, linked to the recruitment of myeloid-derived cells at the db/db gingiva. Both scRNA-seq and histological analysis suggested the inflammatory signaling between fibroblasts and neutrophils as a potential driver of diabetes-induced periodontal damage. Notably, the "immune-like" stromal cells were wired toward the induction of gingival γδ T hyperresponsiveness in db/db mice. Our work reveals that the "immune-like" fibroblasts with transcriptional diversity are involved in the innate immune homeostasis at the diabetic gingiva. It highlights a potentially significant role of these cell types in its pathogenesis.
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Affiliation(s)
- Q Wang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - W Lin
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - X Zhou
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - K Lei
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - R Xu
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - X Zhang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Q Xiong
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - R Sheng
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - W Song
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - W Liu
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Q Wang
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases, West China Hospital of Stomatology, Sichuan University, Chengdu, China
| | - Q Yuan
- 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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Li Y, Du Z, Xie X, Zhang Y, Liu H, Zhou Z, Zhao J, Lee RS, Xiao Y, Ivanoviski S, Yan F. Epigenetic changes caused by diabetes and their potential role in the development of periodontitis. J Diabetes Investig 2021; 12:1326-1335. [PMID: 33300305 PMCID: PMC8354491 DOI: 10.1111/jdi.13477] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2020] [Revised: 11/11/2020] [Accepted: 12/06/2020] [Indexed: 12/11/2022] Open
Abstract
Aims/Introduction Periodontal disease, a chronic inflammation induced by bacteria, is closely linked with diabetes mellitus. Many complications associated with diabetes are related to epigenetic changes. However, the exact epigenetic changes whereby diabetes affects periodontal disease remain largely unknown. Thus, we sought to investigate the role of diabetes‐dependent epigenetic changes of gingival tissue in the susceptibility to periodontal disease. Materials and Methods We studied the effect of streptozotocin‐induced diabetes in minipigs on gingival morphological and epigenetic tissue changes. Accordingly, we randomly divided six minipigs into two groups: streptozotocin‐induced diabetes group, n = 3; and non‐diabetes healthy control group, n = 3. After 85 days, all animals were killed, and gingival tissue was collected for histology, deoxyribonucleic acid methylation analysis and immunohistochemistry. Results A diabetes mellitus model was successfully created, as evidenced by significantly increased blood glucose levels, reduction of pancreatic insulin‐producing β‐cells and histopathological changes in the kidneys. The gingival tissues in the diabetes group presented acanthosis of both gingival squamous epithelium and sulcular/junctional epithelium, and a significant reduction in the number and length of rete pegs. Deoxyribonucleic acid methylation analysis showed a total of 1,163 affected genes, of which 599 and 564 were significantly hypermethylated and hypomethylated, respectively. Immunohistochemistry staining showed that the hypomethylated genes – tumor necrosis factor‐α and interleukin‐6 – were positively expressed under the junctional epithelium area in the diabetes group. Conclusions Diabetes mellitus induces morphological and epigenetic changes in periodontal tissue, which might contribute to the increased susceptibility of periodontal diseases in patients with diabetes.
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Affiliation(s)
- Yanfen Li
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China
| | - Zhibin Du
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Xiaoting Xie
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China
| | - Yangheng Zhang
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China
| | - Huifen Liu
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China
| | - Ziqian Zhou
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China
| | - Jing Zhao
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China
| | - Ryan Sb Lee
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
| | - Yin Xiao
- Institute of Health and Biomedical Innovation, Queensland University of Technology, Brisbane, Queensland, Australia.,Australia-China Center for Tissue Engineering and Regenerative Medicine, Queensland University of Technology, Brisbane, Queensland, Australia
| | - Saso Ivanoviski
- School of Dentistry, The University of Queensland, Brisbane, Queensland, Australia
| | - Fuhua Yan
- Nanjing Stomatological Hospital, Medical School of Nanjing University, Nanjing, China.,Australia-China Center for Tissue Engineering and Regenerative Medicine, Queensland University of Technology, Brisbane, Queensland, Australia
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Abstract
The susceptibility and severity of periodontal diseases is made more severe by diabetes, with the impact on the disease process inversely proportional to the level of glycemic control. Although type 1 diabetes mellitus and type 2 diabetes mellitus have different etiologies, and their impact on bone is not identical, they share many of the same complications. Studies in animals and humans agree that both forms of diabetes increase inflammatory events in periodontal tissue, impair new bone formation, and increase expression of RANKL in response to bacterial challenge. High levels of glucose, reactive oxygen species, and advanced glycation end-products are found in the periodontium of diabetic individuals and lead to increased activation of nuclear factor-kappa B and expression of inflammatory cytokines such as tumor necrosis factor and interleukin-1. Studies in animals, moreover, suggest that there are multiple cell types in periodontal tissues that are affected by diabetes, including leukocytes, vascular cells, mesenchymal stem cells, periodontal ligament fibroblasts, osteoblasts, and osteocytes. The etiology of periodontal disease involves the host response to bacterial challenge that is affected by diabetes, which increases the expression of RANKL and reduces coupled bone formation. In addition, the inflammatory response also modifies the oral microbiota to render it more pathogenic, as demonstrated by increased inflammation and bone loss in animals where bacteria are transferred from diabetic donors to germ-free hosts compared with transfer from normoglycemic donors. This approach has the advantage of not relying upon limited knowledge of the specific bacterial taxa to determine pathogenicity, and examines the overall impact of the microbiota rather than the presumed pathogenicity of a few bacterial groups. Thus, animal studies have provided new insights into pathogenic mechanisms that identify cause-and-effect relationships that are difficult to perform in human studies.
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Affiliation(s)
- Dana T Graves
- Department of Periodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA
| | - Zhenjiang Ding
- Department of Periodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.,Department of Pediatric Dentistry, School of Stomatology, China Medical University, Shenyang, China
| | - Yingming Yang
- Department of Periodontics, School of Dental Medicine, University of Pennsylvania, Philadelphia, Pennsylvania, USA.,State Key Laboratory of Oral Diseases and National Clinical Research Center for Oral Diseases, Department of Preventive Dentistry, West China School of Stomatology, Sichuan University, Chengdu, China
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Panezai J, Altamash M, Engstrӧm PE, Larsson A. Association of Glycated Proteins with Inflammatory Proteins and Periodontal Disease Parameters. J Diabetes Res 2020; 2020:6450742. [PMID: 31998807 PMCID: PMC6977320 DOI: 10.1155/2020/6450742] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/20/2019] [Revised: 12/16/2019] [Accepted: 12/30/2019] [Indexed: 12/14/2022] Open
Abstract
Periodontitis is a chronic inflammatory condition that may contribute to diabetogenesis. The aim was to investigate the levels of glycated proteins and their correlation with periodontal and systemic inflammation. Fifty-one patients with periodontitis and 20 healthy subjects underwent probing pocket depth (PPD) measurements. PPD total and PPD disease with and without tooth adjustment were used as continuous indices. Marginal bone loss (MBL) for mandibular premolars and molars was measured digitally. Body mass index (BMI) and waist circumference (WC) were also analyzed. Glycated hemoglobin (HbA1c) and fructosamine (FrAm) levels were measured in all subjects. A multiplex proximity extension assay (PEA) was used to analyze the serum samples for simultaneous measurement of 92 proteins. Both HbA1c and FrAm inversely correlated with IL-10, FGF-21, MCP-1, and TNF beta amongst 16 proteins. HbA1c correlated directly with OPG. Parameters of disease severity were consistently significant for HbA1c. Adjusted PPD total and number of missing teeth were increased in diabetes whereas levels of RANKL and RANKL to OPG ratio were the highest in nondiabetic periodontitis patients. Hyperglycemic conditions in periodontitis patients are associated with reduced levels of anti-inflammatory proteins as well as dysregulated bone resorption.
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Affiliation(s)
- Jeneen Panezai
- Altamash Institute of Dental Medicine, Department of Periodontology, Karachi, Pakistan
- Karolinska Institutet, Department of Dental Medicine, Division of Oral Diseases, Section of Periodontology, Huddinge, Sweden
| | - Mohammad Altamash
- Altamash Institute of Dental Medicine, Department of Periodontology, Karachi, Pakistan
| | - Per-Erik Engstrӧm
- Karolinska Institutet, Department of Dental Medicine, Division of Oral Diseases, Section of Periodontology, Huddinge, Sweden
| | - Anders Larsson
- Uppsala University, Department of Medical Sciences, Uppsala, Sweden
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Bordin A, Pagano F, Scaccia E, Saccucci M, Vozza I, Incerti N, Polimeni A, Cavarretta E, Chimenti I, De Falco E. Oral Plaque from Type 2 Diabetic Patients Reduces the Clonogenic Capacity of Dental Pulp-Derived Mesenchymal Stem Cells. Stem Cells Int 2019; 2019:1516746. [PMID: 30755774 DOI: 10.1155/2019/1516746] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Accepted: 12/03/2018] [Indexed: 12/19/2022] Open
Abstract
Type 2 diabetes (T2D) is a major metabolic disease and a key epigenetic risk factor for the development of additional clinical complications. Among them, periodontitis (PD), a severe inflammatory disease ascribable to a dysregulated physiology and composition of the oral microbiota, represents one of the most relevant complications. Periodontitis can impact the structure of the tooth and likely the stem and progenitor cell pool, which actively contributes to the periodontal microenvironment and homeostasis. Modifications of the oral plaque play a key role in the etiopathogenesis of PD caused by T2D. However, to what extent the biology of the progenitor pool is affected has still to be elucidated. In this short report, we aimed to explore the biological effects of oral plaque derived from T2D patients with PD in comparison to non-diabetic patients with PD. Oral plaque samples were isolated from T2D and non-diabetic subjects with PD. Dental pulp stem cells (DPSCs), derived from the premolar tooth, were conditioned for 21 days with oral plaque samples and tested for their clonogenic ability. Cultures were also induced to differentiate towards the osteogenic lineage, and ALP and osteocalcin gene expression levels were evaluated by real-time qPCR. Results have shown that the number of clones generated by DPSCs exposed to T2D oral plaque was significantly lower compared to controls (ctl). The multivariate analysis confirmed that the decreased clonogenesis was significantly correlated only with T2D diagnosis. Moreover, the effect of T2D oral plaque was specific to DPSCs. Indicators of osteogenic differentiation were not significantly affected. This study provides a new biological insight into the effects ascribable to T2D in PD.
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Monea A, Eremie LY, Bukhari C, Beresescu G, Biris C. Mediators of Inflammation as a Link Between Diabetes Mellitus and Periodontal Breakdown. Acta Medica Marisiensis 2018; 64:39-45. [DOI: 10.2478/amma-2018-0005] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Abstract
Our objective was to investigate immunological changes that occur in saliva of subjects with type 2 diabetes mellitus (T2DM) without signs of periodontal disease and to establish if salivary inflammatory cytokines are a possible link between diabetes mellitus and periodontal breakdown.
Material and methods. Twenty T2DM subjects with no periodontal disease and twenty healthy controls were registered for the present study. TNF-α and IL-6 level from saliva and serum were measured. Periodontal tissue samples were histologically examined.
Results: TNF-α and IL-6 levels were higher in T2DM subjects compared to controls, with an extremely significant difference in saliva (p<0.001). Significant inflammation, affecting both epithelial and connective tissues was present in periodontal biopsies.
Conclusions: The subjects showed an increased TNF-α and IL-6 levels, both in serum and -mostly in -saliva of diabetics without signs of periodontal disease, confirming the hypothesis of immunological implication, as a correlation between periodontal disease incidence and diabetes mellitus. Histologic alterations, suggesting a local inflammatory state, were present in periodontal tissue of diabetics, confirming the above hypothesis. The study reveals that saliva analysis is a quite efficient method in testing the periodontal breakdown progression in the subjects with T2DM.
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Gurav AN. Management of diabolical diabetes mellitus and periodontitis nexus: Are we doing enough? World J Diabetes 2016; 7:50-66. [PMID: 26962409 PMCID: PMC4766246 DOI: 10.4239/wjd.v7.i4.50] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/10/2015] [Revised: 10/16/2015] [Accepted: 01/19/2016] [Indexed: 02/05/2023] Open
Abstract
Periodontitis is the commonest oral disease affecting population worldwide. This disease is notorious for the devastation of tooth supporting structures, ensuing in the loss of dentition. The etiology for this disease is bacterial biofilm, which accumulates on the teeth as dental plaque. In addition to the biofilm microorganisms, other factors such as environmental, systemic and genetic are also responsible in progression of periodontitis. Diabetes mellitus (DM) is metabolic disorder which has an impact on the global health. DM plays a crucial role in the pathogenesis of periodontitis. Periodontitis is declared as the “sixth” major complication of DM. Evidence based literature has depicted an enhanced incidence and severity of periodontitis in subjects with DM. A “two way” relationship has been purported between periodontitis and DM. Mutual management of both conditions is necessary. Periodontal therapy (PT) may assist to diminish the progression of DM and improve glycemic control. Various advanced technological facilities may be utilized for the purpose of patient education and disease management. The present paper clarifies the etio-pathogenesis of periodontitis, establishing it as a complication of DM and elaborating the various mechanisms involved in the pathogenesis. The role of PT in amelioration of DM and application of digital communication will be discussed. Overall, it is judicious to create an increased patient cognizance of the periodontitis-DM relationship. Conjunctive efforts must be undertaken by the medical and oral health care professionals for the management of periodontitis affected DM patients.
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Balci Yuce H, Karatas O, Aydemir Turkal H, Pirim Gorgun E, Ocakli S, Benli I, Cayli S. The Effect of Melatonin on Bone Loss, Diabetic Control, and Apoptosis in Rats With Diabetes With Ligature-Induced Periodontitis. J Periodontol 2015; 87:e35-43. [PMID: 26654347 DOI: 10.1902/jop.2015.150315] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
BACKGROUND The aim of this study examines the effect of systemic melatonin administration on proinflammatory cytokine levels, apoptosis, alveolar bone loss (ABL), lipid metabolism, and diabetic control in in rats with diabetes mellitus (DM) and ligature-induced periodontitis. METHODS Fifty-two male Wistar rats were used in this study. Study groups were as follows: 1) non-ligated control (NL, n = 6); 2) streptozotocin (STZ, n = 8); 3) STZ and melatonin (STZ+Mel, n = 8); 4) ligature (L, n = 6); 5) ligature and melatonin (L+Mel, n = 8); 6) STZ and ligature (STZ+L, n = 8); and 7) STZ, ligature, and melatonin (STZ+L+Mel, n = 8). DM was induced by intraperitoneal injection of a single dose of STZ (60 mg/kg). Melatonin was administered by intraperitoneal injection of a dose of 10 mg/kg/day for 4 weeks. Silk ligatures were placed subgingivally around the mandibular right first molars. The study period was 4 weeks, and animals were sacrificed at the end of 4 weeks. Morphometric analysis of bone loss was performed. Tissues were histopathologically examined. Inducible nitric oxide synthase (iNOS) and B-cell lymphoma-2-associated X (bax) protein expressions, serum interleukin (IL)-1β levels, and tartrate-resistant acid phosphatase-positive (TRAP+) osteoclast numbers were also evaluated. RESULTS After 4 weeks, the highest ABL was observed in the STZ+L group, and the difference was significant (P <0.05). Systemically administered melatonin significantly decreased ABL in the STZ+L+Mel group compared with that in the STZ+L group (P <0.05). TRAP+ osteoclast numbers were the highest in the STZ+L group, and melatonin significantly decreased osteoclast numbers (P <0.05) but had no effect on iNOS, IL-1β, or bax levels. CONCLUSIONS Within the limits of this study, it can be concluded that systemic melatonin treatment may decrease osteoclastic activity and reduce ABL in the model using rats with DM.
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Affiliation(s)
- Hatice Balci Yuce
- Department of Periodontology, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkey
| | - Ozkan Karatas
- Department of Periodontology, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkey
| | - Humeyra Aydemir Turkal
- Department of Periodontology, Faculty of Dentistry, Gaziosmanpaşa University, Tokat, Turkey
| | - Emine Pirim Gorgun
- Department of Periodontology, Faculty of Dentistry, Cumhuriyet University, Sivas, Turkey
| | - Seda Ocakli
- Department of Histology and Embryology, Faculty of Medicine, Gaziosmanpaşa University
| | - Ismail Benli
- Department of Biochemistry, Faculty of Medicine, Gaziosmanpaşa University
| | - Sevil Cayli
- Department of Histology and Embryology, Faculty of Medicine, Yıldırım Beyazıt University, Ankara, Turkey
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Balci Yuce H, Toker H, Goze F. The histopathological and morphometric investigation of the effects of systemically administered boric acid on alveolar bone loss in ligature-induced periodontitis in diabetic rats. Acta Odontol Scand 2014; 72:729-36. [PMID: 24720865 DOI: 10.3109/00016357.2014.898789] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE The purpose of this study was to evaluate the effects of systemically administered boric acid on alveolar bone loss, histopathological changes and oxidant/antioxidant status in ligature-induced periodontitis in diabetic rats. MATERIALS AND METHODS Forty-four Wistar rats were divided into six experimental groups: (1) non-ligated (NL, n = 6) group, (2) ligature only (LO, n = 6) group, (3) Streptozotocin only (STZ, n = 8) group, (4) STZ and ligature (STZ+LO, n = 8) group, (5) STZ, ligature and systemic administration of 15 mg/kg/day boric acid for 15 days (BA15, n = 8) group and (6) STZ, ligature and systemic administration of 30 mg/kg/day boric acid for 15 days (BA30, n = 8) group. Diabetes mellitus was induced by 60 mg/kg streptozotocin. Silk ligatures were placed at the gingival margin of lower first molars of the mandibular quadrant. The study duration was 15 days after diabetes induction and the animals were sacrificed at the end of this period. Changes in alveolar bone levels were clinically measured and tissues were histopathologically examined. Serum total antioxidant status (TAS), total oxidant status (TOS), calcium (Ca) and magnesium (Mg) levels and oxidative stress index (OSI) were evaluated. Primary outcome was alveolar bone loss. Seconder outcome (osteoblast number) was also measured. RESULTS At the end of 15 days, the alveolar bone loss was significantly higher in the STZ+LO group compared to the other groups (p < 0.05). There was no significant difference in alveolar bone loss between the STZ+LO 15 mg/kg boric acid and STZ+LO 30 mg/kg boric acid groups (p > 0.05). Systemically administered boric acid significantly decreased alveolar bone loss compared to the STZ+LO group (p < 0.05). The osteoblast number in the BA30 group was significantly higher than those of the NL, STZ and STZ+LO groups (p < 0.05). Inflammatory cell infiltration was significantly higher in the STZ+LO group the other groups (p < 0.05). Serum TAS levels were significantly higher in the NL and LO groups than the other groups (p < 0.05). The differences in TOS levels were not found to be significant among all the groups (p > 0.05). The OSI values of the BA30 group were significantly lower than the STZ+LO group (p < 0.05). Also, the differences in serum calcium and magnesium levels were insignificant among the all groups (p > 0.05). CONCLUSION Within the limits of this study, it can be suggested that BA, when administered systemically, may reduce alveolar bone loss in the diabetic rat model.
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Affiliation(s)
- Hatice Balci Yuce
- Department of Periodontology, Faculty of Dentistry, Gaziosmanpaşa University , Tokat , Turkey
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Dağ A, Tules Fırat E, Uysal E, Ketani Ş, Aydın Ketani M. Histological investigation of the impact of streptozotocin-induced experimental diabetes on the healthy gingivae of rats. BIOTECHNOL BIOTEC EQ 2014; 28:710-715. [PMID: 26740771 PMCID: PMC4684055 DOI: 10.1080/13102818.2014.943558] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2014] [Accepted: 06/26/2014] [Indexed: 11/02/2022] Open
Abstract
This study was aimed at the histological investigation of the impact of experimental diabetes on the healthy gingiva of rats. Thirty male Wistar rats were used in this study. The animals were randomly divided into two groups (n = 15) prior to the experiment. Group 1 experimental diabetes was created by streptozotocin injection in 15 rats. Group 2 comprised the control group (15 rats). On the 7th, 14th and 21st days after the induction of diabetes by streptozotocin, five animals from each group were euthanized by cardiac puncture. The gingiva of the maxillary left first molar tooth of the sacrificed animals was extracted for histological examination. Histological examination demonstrated that, when compared to the control group, the diabetes group displayed marked hyperkeratosis and parakeratosis of the gingival epithelium on day 21 post-induction. Furthermore, the diabetes group presented with an increased number of inflammatory cells and vasodilatation of the capillaries, in comparison to the controls. The overall evaluation of the findings obtained in this study suggested that diabetes alone could cause changes in the periodontium and affect periodontal health.
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Affiliation(s)
- Ahmet Dağ
- Faculty of Dentistry, Dicle University, Diyarbakir, Turkey
| | | | - Ersin Uysal
- Diyarbakir Vocational School, Dicle University, Diyarbakir, Turkey
| | - Şennur Ketani
- Faculty of Education, Dicle University, Diyarbakir, Turkey
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Monea A, Mezei T, Popsor S, Monea M. Oxidative Stress: A Link between Diabetes Mellitus and Periodontal Disease. Int J Endocrinol 2014; 2014:917631. [PMID: 25525432 PMCID: PMC4265692 DOI: 10.1155/2014/917631] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2014] [Accepted: 08/11/2014] [Indexed: 11/23/2022] Open
Abstract
Objective. To investigate oxidative stress (OS) and histological changes that occur in the periodontium of subjects with type 2 diabetes mellitus without signs of periodontal disease and to establish if oxidative stress is a possible link between diabetes mellitus and periodontal changes. Materials and Methods. Tissue samples from ten adult patients with type 2 diabetes mellitus (T2D) and eight healthy adults were harvested. The specimens were examined by microscope using standard hematoxylin-eosin stain, at various magnifications, and investigated for tissue levels of malondialdehyde (MDA) and glutathione (GSH). Results. Our results showed that periodontal tissues in patients with T2D present significant inflammation, affecting both epithelial and connective tissues. Mean MDA tissue levels were 3.578 ± 0.60 SD in diabetics versus 0.406 ± 0.27 SD in controls (P < 0.0001), while mean GSH tissue levels were 2.48 ± 1.02 SD in diabetics versus 9.7875 ± 2.42 SD in controls (P < 0.0001). Conclusion. Diabetic subjects had higher MDA levels in their periodontal tissues, suggesting an increased lipid peroxidation in T2D, and decreased GSH tissue levels, suggesting an alteration of the local antioxidant defense mechanism. These results are in concordance with the histological changes that we found in periodontal tissues of diabetic subjects, confirming the hypothesis of OS implication, as a correlation between periodontal disease incidence and T2D.
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Affiliation(s)
- Adriana Monea
- Department of Odontology and Periodontology, Faculty of Dental Medicine, University of Medicine and Pharmacy Târgu Mureș, 38 Gheorghe Marinescu Street, 540114 Târgu Mureș, Romania
- *Adriana Monea:
| | - Tibor Mezei
- Department of Morphopathology, Faculty of Medicine, University of Medicine and Pharmacy Târgu Mureș, 38 Gheorghe Marinescu Street, 540114 Târgu Mureș, Romania
| | - Sorin Popsor
- Department of Prosthetics and Oral Rehabilitation, Faculty of Dental Medicine, University of Medicine and Pharmacy Târgu Mureș, 38 Gheorghe Marinescu Street, 540114 Târgu Mureș, Romania
| | - Monica Monea
- Department of Odontology and Periodontology, Faculty of Dental Medicine, University of Medicine and Pharmacy Târgu Mureș, 38 Gheorghe Marinescu Street, 540114 Târgu Mureș, Romania
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Shirakata Y, Eliezer M, Nemcovsky CE, Weinreb M, Dard M, Sculean A, Bosshardt DD, Moses O. Periodontal healing after application of enamel matrix derivative in surgical supra/infrabony periodontal defects in rats with streptozotocin-induced diabetes. J Periodontal Res 2013; 49:93-101. [DOI: 10.1111/jre.12084] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/09/2013] [Indexed: 01/21/2023]
Affiliation(s)
- Y. Shirakata
- Department of Periodontology; School of Dental Medicine; University of Bern; Bern Switzerland
- Department of Periodontology; Kagoshima University Graduate School of Medical and Dental Sciences; Kagoshima Japan
| | - M. Eliezer
- Department of Periodontology; The Maurice and Goldschleger School of Dental Medicine; Tel Aviv Israel
| | - C. E. Nemcovsky
- Department of Periodontology; The Maurice and Goldschleger School of Dental Medicine; Tel Aviv Israel
| | - M. Weinreb
- Department of Oral Biology; The Maurice and Goldschleger School of Dental Medicine; Tel Aviv Israel
| | - M. Dard
- Straumann AG; Basel Switzerland
- Department of Periodontology and Implant Dentistry; New York University; Basel Switzerland
| | - A. Sculean
- Department of Periodontology; School of Dental Medicine; University of Bern; Bern Switzerland
| | - D. D. Bosshardt
- Department of Periodontology; School of Dental Medicine; University of Bern; Bern Switzerland
- Department of Oral Surgery and Stomatology; School of Dental Medicine; University of Bern; Bern Switzerland
| | - O. Moses
- Department of Periodontology; The Maurice and Goldschleger School of Dental Medicine; Tel Aviv Israel
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Chang PC, Chien LY, Yeo JF, Wang YP, Chung MC, Chong LY, Kuo MYP, Chen CH, Chiang HC, Ng BN, Lee QQ, Phay YK, Ng JR, Erk KY. Progression of periodontal destruction and the roles of advanced glycation end products in experimental diabetes. J Periodontol 2012; 84:379-88. [PMID: 22554295 DOI: 10.1902/jop.2012.120076] [Citation(s) in RCA: 44] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
BACKGROUND Progression of diabetes-associated periodontal destruction and the roles of advanced glycation end products (AGEs) are investigated. METHODS Diabetes was induced by streptozocotin injection, and periodontitis was induced via silk ligature placement with Porphyromonas gingivalis lipopolysaccharide injection in 64 Sprague-Dawley rats for 7 to 21 days. The quality of alveolar bone and attachment loss (AL) were measured by microcomputed tomography and histology. Destruction profiles were evaluated by histology, histochemistry, immunohistochemistry, and quantitative assessments of inflammatory cells, expression of receptors for AGEs (RAGE), tartrate-resistant acid phosphatase, and proliferating cell nuclear antigen. RESULTS Without periodontitis induction, there was no obvious morphologic change in the periodontium, although slight elevations of AGEs and RAGE levels were noted in animals with diabetes. In the group with experimental periodontitis, significant periodontal bone loss was noted in animals both with and without diabetes from day 7, with more progressive bone loss in animals with diabetes during days 14 to 21. Histologically, the disruption of attachment and inflammation were observed from day 7, but subsequently subsided in animals without diabetes. A stronger and more prolonged response with significant AL was observed in animals with diabetes. Stronger inflammation, attenuated and persistent resorptive activity, and weaker proliferating potential were demonstrated by animals with diabetes. AGE deposition and RAGE expression were noted in animals without diabetes but with periodontitis, although levels were considerably elevated in the later stages in animals with diabetes. CONCLUSIONS Diabetes augments periodontal destruction by reducing the proliferating capability and activating resorptive activities. Presence of the AGE-RAGE axis without diabetes implies that it is involved in the regulation of inflammation.
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Affiliation(s)
- Po-Chun Chang
- Faculty of Dentistry, National University of Singapore, Singapore, Singapore.
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Silva JA, Ferrucci DL, Peroni LA, Abrahão PG, Salamene AF, Rossa-Junior C, Carvalho HF, Stach-Machado DR. Sequential IL-23 and IL-17 and increasedMmp8andMmp14expression characterize the progression of an experimental model of periodontal disease in type 1 diabetes. J Cell Physiol 2012; 227:2441-50. [DOI: 10.1002/jcp.22979] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Obradović R, Kesić L, Mihailović D, Antić S, Jovanović G, Petrović A, Peševska S. A histological evaluation of a low-level laser therapy as an adjunct to periodontal therapy in patients with diabetes mellitus. Lasers Med Sci 2013; 28:19-24. [DOI: 10.1007/s10103-012-1058-7] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2011] [Accepted: 01/18/2012] [Indexed: 11/28/2022]
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Silva JAF, Lopes Ferrucci D, Peroni LA, de Paula Ishi E, Rossa-Junior C, Carvalho HF, Stach-Machado DR. Periodontal disease-associated compensatory expression of osteoprotegerin is lost in type 1 diabetes mellitus and correlates with alveolar bone destruction by regulating osteoclastogenesis. Cells Tissues Organs 2012; 196:137-50. [PMID: 22301390 DOI: 10.1159/000330879] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/17/2011] [Indexed: 12/21/2022] Open
Abstract
Alveolar bone resorption results from the inflammatory response to periodontal pathogens. Systemic diseases that affect the host response, such as type 1 diabetes mellitus (DM1), can potentiate the severity of periodontal disease (PD) and accelerate bone resorption. However, the biological mechanisms by which DM1 modulates PD are not fully understood. The aim of this study was to determine the influence of DM1 on alveolar bone resorption and to evaluate the role of receptor activator of nuclear factor-kappaB ligand (RANKL)/osteoprotegerin (OPG) in osteoclastogenesis in rats. PD was induced by means of ligature in nondiabetic and in streptozotocyn-induced DM1 rats. Morphological and morphometric analyses, stereology and osteoclast counting were performed. RANKL and OPG mRNA levels, protein content, and location were determined. PD caused alveolar bone resorption, increased the number of osteoclasts in the alveolar bone crest and also promoted changes in RANKL/OPG mRNA expression. DM1 alone showed alveolar bone destruction and an increased number of osteoclasts at the periapical and furcal regions. DM1 exacerbated these characteristics, with a greater impact on bone structure, resulting in a low OPG content and a higher RANKL/OPG ratio, which correlated with prominent osteoclastogenesis. This work demonstrates that the effects of PD and DM1 enhance bone destruction, confirms the importance of the RANKL signaling pathway in bone destruction in DM1 in animal models and suggests the existence of alternative mechanisms potentiating bone degradation in PD.
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Affiliation(s)
- Juliete Aparecida F Silva
- Department of Anatomy, Cell Biology, Physiology and Biophysics, State University of Campinas, Campinas, Brazil
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Lee GH, Oh HW, Lim HD, Lee W, Chae HJ, Kim HR. 4-phenylbutyric Acid Regulates Collagen Synthesis and Secretion Induced by High Concentrations of Glucose in Human Gingival Fibroblasts. Korean J Physiol Pharmacol 2011; 15:345-51. [PMID: 22359472 PMCID: PMC3282222 DOI: 10.4196/kjpp.2011.15.6.345] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/16/2011] [Revised: 10/18/2011] [Accepted: 10/26/2011] [Indexed: 12/25/2022]
Abstract
High glucose leads to physio/pathological alterations in diabetes patients. We investigated collagen production in human gingival cells that were cultured in high concentrations of glucose. Collagen synthesis and secretion were increased when the cells were exposed to high concentrations of glucose. We examined endoplasmic reticulum (ER) stress response because glucose metabolism is related to ER functional status. An ER stress response including the expression of glucose regulated protein 78 (GRP78), C/EBP homologous protein (CHOP), inositol requiring enzyme alpha (IRE-1α) and phosphoreukaryotic initiation factor alpha (p-eIF-2α) was activated in the presence of high glucose. Activating transcription factor 4 (ATF-4), a downstream protein of p-eIF-2α as well as a transcription factor for collagen, was also phosphorylated and translocalized into the nucleus. The chemical chaperone 4-PBA inhibited the ER stress response and ATF-4 phosphorylation as well as nuclear translocation. Our results suggest that high concentrations of glucose-induced collagen are linked to ER stress and the associated phosphorylation and nuclear translocation of ATF-4.
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Affiliation(s)
- Geum-Hwa Lee
- Department of Dental Pharmacology and Wonkwang Dental Research Institute, School of Dentistry, Wonkwang University, Iksan 570-711, Korea
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Ross JH, Hardy DC, Schuyler CA, Slate EH, Mize TW, Huang Y. Expression of periodontal interleukin-6 protein is increased across patients with neither periodontal disease nor diabetes, patients with periodontal disease alone and patients with both diseases. J Periodontal Res 2010; 45:688-94. [PMID: 20682019 DOI: 10.1111/j.1600-0765.2010.01286.x] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND AND OBJECTIVE Epidemiological studies have established that patients with diabetes have an increased prevalence and severity of periodontal disease. Interleukin (IL)-6, a multifunctional cytokine, plays a role in the tissue inflammation that characterizes periodontal disease. Our recent study has shown a trend of increase in periodontal IL-6 expression at the mRNA level across patients with neither periodontal disease nor diabetes, patients with periodontal disease alone and patients with both diseases. However, the periodontal IL-6 expression at the protein level in these patients has not been investigated. MATERIAL AND METHODS Periodontal tissue specimens were collected from eight patients without periodontal disease and diabetes (group 1), from 17 patients with periodontal disease alone (group 2) and from 10 patients with both periodontal disease and diabetes (group 3). The frozen sections were prepared from these tissue specimens and IL-6 protein expression was detected and quantified. RESULTS The nonparametric Kruskal-Wallis test showed that the difference in IL-6 protein levels among the three groups was statistically significant (p = 0.035). Nonparametric analysis using the Jonckheere-Terpstra test showed a tendency of increase in periodontal IL-6 protein levels across group 1 to group 2 to group 3 (p = 0.006). Parametric analysis of variance (ANOVA) on IL-6 protein levels showed that neither age nor gender significantly affected the difference of IL-6 levels among the groups. CONCLUSION Periodontal IL-6 expression at the protein level is increased across patients with neither periodontal disease nor diabetes, patients with periodontal disease alone and patients with both diseases.
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Affiliation(s)
- J H Ross
- Division of Periodontics, Department of Stomatology, College of Dental Medicine, Medical University of South Carolina, Charleston, SC, USA
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Um YJ, Jung UW, Kim CS, Bak EJ, Cha JH, Yoo YJ, Choi SH. The influence of diabetes mellitus on periodontal tissues: a pilot study. J Periodontal Implant Sci 2010; 40:49-55. [PMID: 20498760 PMCID: PMC2872813 DOI: 10.5051/jpis.2010.40.2.49] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2009] [Accepted: 02/25/2010] [Indexed: 12/31/2022] Open
Abstract
Purpose The purpose of this study was to preliminarily evaluate the influence of diabetes mellitus (DM) on periodontal tissue without establishment of periodontitis. Methods Seven-week-old db/db mice were used for the diabetic experimental group and systematically healthy mice of the same age were used as controls. After 1 week of acclimatization, the animals were sacrificed for hard and soft tissue evaluation. The pattern of bone destruction was evaluated by stereomicroscope evaluation with alizarin red staining and radiographic evaluation by microscopic computerized tomography images. Histological evaluation was performed with hematoxylin and eosin stain for evaluation of soft tissue changes. Results In both stereomicroscope evaluation and radiograph image analysis, aggressive form of bone destruction was observed in diabetic animals when compared to the systematically healthy controls. In histological evaluation, apical migration of junctional epithelium with slight inflammatory cell infiltration was observed with disarrangement of connective tissue fibers. Conclusions Within the limits of this study, diabetic animals presented distortion in periodontal attachment and an aggressive bone loss pattern when compared to the healthy controls, suggesting that DM has an independent effect on periodontal tissue destruction irrespective of the presence or absence of periodontal disease.
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Affiliation(s)
- Yoo-Jung Um
- Department of Periodontology, Research Institute for Periodontal Regeneration, Yonsei University College of Dentistry, Seoul, Korea
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Donovan TE, Anderson M, Becker W, Cagna DR, Hilton TJ, Rouse J. Annual review of selected scientific literature: Report of the Committee on Scientific Investigation of the American Academy of Restorative Dentistry. J Prosthet Dent 2009; 102:10-45. [DOI: 10.1016/s0022-3913(09)60095-0] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Lorencini M, Silva JAF, Almeida CA, Bruni-Cardoso A, Carvalho HF, Stach-Machado DR. A new paradigm in the periodontal disease progression: gingival connective tissue remodeling with simultaneous collagen degradation and fibers thickening. Tissue Cell 2008; 41:43-50. [PMID: 18801546 DOI: 10.1016/j.tice.2008.07.001] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2008] [Revised: 07/14/2008] [Accepted: 07/17/2008] [Indexed: 11/18/2022]
Abstract
Bacterial dental plaque is considered to be the main cause of periodontal diseases, but progression of the disease is also related to the host inflammatory response. The earliest affected tissue is the gingiva, but the specific mechanisms involved in the onset of this condition remain unclear. Frequently, collagen degradation is pointed as the main marker of periodontal disease progression, but the organization of the fibers in the gingival tissue is still unknown. The aim of the present study was to investigate the gingival extracellular matrix in a model of ligature-induced periodontal disease. Analysis of the microbiota indicated a progressive increase in the ratio of Gram-negative/Gram-positive microorganisms. There was no difference in the organization of reticulin fibers next to the epithelial basement membrane, whereas the arrangement of collagen fibers in the gingival connective tissue was significantly affected. Animals with inflammation presented a reduction of 35% in the total area occupied by collagen fibers. However, these fibers were thicker and more densely packed. These alterations involve type I, type III and type VI collagens as determined by immunohistochemistry. The results demonstrated the occurrence of marked reorganization of the gingival extracellular matrix in response to the inflammatory process, indicating a new paradigm in the periodontal disease progression: collagen degradation and fibers thickening, simultaneously.
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Affiliation(s)
- M Lorencini
- Department of Microbiology and Immunology, Institute of Biology, State University of Campinas (UNICAMP), Campinas, SP, Brazil
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