scholarly journals Mixed lineage kinase domain-like pseudokinase mediated necroptosis aggravates periodontitis progression

2021 ◽  
Author(s):  
Yanan Yang ◽  
Lingxia Wang ◽  
Haibing Zhang ◽  
Lijun Luo
Keyword(s):  
Bone Marrow ◽  
Bone Loss ◽  
Porphyromonas Gingivalis ◽  
Alveolar Bone ◽  
Alveolar Bone Loss ◽  
Mrna Levels ◽  
Genetic Ablation ◽  
Osteoclast Activation

Abstract Necroptosis is a form of cell death that is reportedly involved in the pathogenesis of periodontitis. However, the role of Mlkl-involved necroptosis remains unclear. Herein, we aim to explore the role of MLKL-mediated necroptosis in periodontitis in vitro and in vivo. Expression of RIPK3, MLKL, and phosphorylated MLKL is observed in gingival tissues obtained from healthy subjects or patients with periodontitis. Viability of Porphyromonas gingivalis lipopolysaccharide (LPS-Pg)-treated cells was detected. In wild type or Mlkl deficiency mice with ligature-induced periodontitis, alveolar bone loss and osteoclast activation were assessed. mRNA levels of inflammatory cytokines in bone marrow-derived macrophages were tested by qRT-PCR. Increased expression of RIPK3, MLKL, and phosphorylated MLKL is observed in gingival tissues obtained from patients with periodontitis. Porphyromonas gingivalis lipopolysaccharide (LPS-Pg)-treated cells developed necroptosis after caspase inhibition and negatively regulated the NF-κB signaling pathway. In mice with ligature-induced periodontitis, Mlkl deficiency reduced alveolar bone loss and weakened osteoclast activation. Furthermore, genetic ablation of Mlkl in LPS-Pg-treated bone marrow-derived macrophages increased the mRNA levels of tumor necrosis factor-α, interleukin (Il)-1β, Il-6, cyclooxygenase 2, matrix metalloproteinase 9, and receptor activator of nuclear factor kappa-B ligand. Our data indicated that MLKL-mediated necroptosis aggravates the development of periodontitis in a Mlkl-deficient mouse. And this will provide a new sight for the understanding of etiology and therapies of periodontitis.

scholarly journals In Vivo Killing of Porphyromonas gingivalis by Toluidine Blue-Mediated Photosensitization in an Animal Model

2003 ◽  
Vol 47 (3) ◽  
pp. 932-940 ◽  
Author(s):  
N. Kömerik ◽  
H. Nakanishi ◽  
A. J. MacRobert ◽  
B. Henderson ◽  
P. Speight ◽  
...  
Keyword(s):  
Bone Loss ◽  
Porphyromonas Gingivalis ◽  
Toluidine Blue ◽  
Alveolar Bone ◽  
Laser Light ◽  
Antimicrobial Treatment ◽  
Maxillary Molar ◽  
Viable Bacteria

ABSTRACT Porphyromonas gingivalis is one of the major causative organisms of periodontitis and has been shown to be susceptible to toluidine blue-mediated photosensitization in vitro. The aims of the present study were to determine whether this technique could be used to kill the organism in the oral cavities of rats and whether this would result in a reduction in the alveolar bone loss characteristic of periodontitis. The maxillary molars of rats were inoculated with P. gingivalis and exposed to up to 48 J of 630-nm laser light in the presence of toluidine blue. The number of surviving bacteria was then determined, and the periodontal structures were examined for evidence of any damage. When toluidine blue was used together with laser light there was a significant reduction in the number of viable P. gingivalis organisms. No viable bacteria could be detected when 1 mg of toluidine blue per ml was used in conjunction with all light doses used. On histological examination, no adverse effect of photosensitization on the adjacent tissues was observed. In a further group of animals, after time was allowed for the disease to develop in controls, the rats were killed and the level of maxillary molar alveolar bone was assessed. The bone loss in the animals treated with light and toluidine blue was found to be significantly less than that in the control groups. The results of this study show that toluidine blue-mediated lethal photosensitization of P. gingivalis is possible in vivo and that this results in decreased bone loss. These findings suggest that photodynamic therapy may be useful as an alternative approach for the antimicrobial treatment of periodontitis.

Involvement of Cot/Tp12 in Bone Loss during Periodontitis

2010 ◽  
Vol 89 (2) ◽  
pp. 192-197 ◽  
Author(s):  
T. Ohnishi ◽  
A. Okamoto ◽  
K. Kakimoto ◽  
K. Bandow ◽  
N. Chiba ◽  
...  
Keyword(s):  
Bone Loss ◽  
Alveolar Bone ◽  
Alveolar Bone Loss ◽  
Periodontal Tissue ◽  
Rankl Expression ◽  
Periodontal Tissues ◽  
Tnf Α ◽  
Experimental Periodontitis ◽  
Deficient Mice

Periodontitis causes resorption of alveolar bone, in which RANKL induces osteoclastogenesis. The binding of lipopolysaccharide to Toll-like receptors causes phosphorylation of Cot/Tp12 to activate the MAPK cascade. Previous in vitro studies showed that Cot/Tp12 was essential for the induction of RANKL expression by lipopolysaccharide. In this study, we examined whether Cot/Tp12 deficiency reduced the progression of alveolar bone loss and osteoclastogenesis during experimental periodontitis. We found that the extent of alveolar bone loss and osteoclastogenesis induced by ligature-induced periodontitis was decreased in Cot/Tp12-deficient mice. In addition, reduction of RANKL expression was observed in periodontal tissues of Cot/Tp12-deficient mice with experimental periodontitis. Furthermore, we found that Cot/Tp12 was involved in the induction of TNF-α mRNA expression in gingiva of mice with experimental periodontitis. Our observations suggested that Cot/Tp12 is essential for the progression of alveolar bone loss and osteoclastogenesis in periodontal tissue during experimental periodontitis mediated through increased RANKL expression.

The interleukin-10 knockout mouse is highly susceptible to Porphyromonas gingivalis-induced alveolar bone loss

2004 ◽  
Vol 39 (6) ◽  
pp. 432-441 ◽  
Author(s):  
Hajime Sasaki ◽  
Yoshimasa Okamatsu ◽  
Toshihisa Kawai ◽  
Ralph Kent ◽  
Martin Taubman ◽  
...  
Keyword(s):  
Bone Loss ◽  
Porphyromonas Gingivalis ◽  
Knockout Mouse ◽  
Alveolar Bone ◽  
Interleukin 10 ◽  
Alveolar Bone Loss

scholarly journals Micromolar sodium fluoride mediates anti-osteoclastogenesis in Porphyromonas gingivalis-induced alveolar bone loss

2015 ◽  
Vol 7 (4) ◽  
pp. 242-249 ◽  
Author(s):  
Ujjal K Bhawal ◽  
Hye-Jin Lee ◽  
Kazumune Arikawa ◽  
Michiharu Shimosaka ◽  
Masatoshi Suzuki ◽  
...  
Keyword(s):  
Bone Loss ◽  
Porphyromonas Gingivalis ◽  
Sodium Fluoride ◽  
Alveolar Bone ◽  
Alveolar Bone Loss

scholarly journals Kgp and RgpB, but Not RgpA, Are Important for Porphyromonas gingivalis Virulence in the Murine Periodontitis Model

2007 ◽  
Vol 75 (3) ◽  
pp. 1436-1442 ◽  
Author(s):  
Rishi D. Pathirana ◽  
Neil M. O'Brien-Simpson ◽  
Gail C. Brammar ◽  
Nada Slakeski ◽  
Eric C. Reynolds
Keyword(s):  
Bone Loss ◽  
Porphyromonas Gingivalis ◽  
Alveolar Bone ◽  
Alveolar Bone Loss ◽  
Enzyme Linked Immunosorbent Assay ◽  
Bacterial Cells ◽  
Wild Type ◽  
Isogenic Mutant ◽  
Specific Immunoglobulin ◽  
Isogenic Mutants

ABSTRACT The contributions of three proteinase genes (rgpA, rgpB, and kgp) to the virulence of Porphyromonas gingivalis W50 were investigated in the murine periodontitis model. Mice were orally inoculated with eight doses (1 × 1010 cells per dose) of rgpA, rgpB, kgp, rgpA rgpB, or rgpA rgpB kgp isogenic mutants, and the level of alveolar bone loss, immune response induced, and number of bacterial cells per half maxilla were compared with those of animals inoculated with wild-type P. gingivalis. The kgp, rgpB, rgpA rgpB, and rgpA rgpB kgp isogenic mutants induced significantly (P < 0.05) less bone loss than the rgpA isogenic mutant and the wild type did, and the virulence of the rgpA isogenic mutant and the wild type were not significantly different. Mice inoculated with the wild type or the rgpA isogenic mutant exhibited significantly (P < 0.01) more P. gingivalis cells per half maxilla than mice inoculated with rgpB, kgp, rgpA rgpB, and rgpA rgpB kgp isogenic mutants or nonchallenged mice did, as determined using real-time PCR. A significant positive correlation was found between the number of P. gingivalis cells detected per half maxilla and the amount of alveolar bone loss induced. Enzyme-linked immunosorbent assay results showed that each isogenic mutant and the wild type induced a predominant P. gingivalis antigen-specific immunoglobulin G3 (IgG3) response. Furthermore, the kgp and rgpA rgpB kgp isogenic mutants induced significantly (P < 0.05) lower IgG3 antibody responses than the responses induced by the wild type or the rgpA, rgpB, and rgpA rgpB isogenic mutants. The results suggest that the order in which the proteinases contribute to the virulence of P. gingivalis in the murine periodontitis model is Kgp ≥ RgpB ≫ RgpA.

scholarly journals Local and Systemic Responses in Matrix Metalloproteinase 8-Deficient Mice during Porphyromonas gingivalis-Induced Periodontitis

2008 ◽  
Vol 77 (2) ◽  
pp. 850-859 ◽  
Author(s):  
Heidi Kuula ◽  
Tuula Salo ◽  
Emma Pirilä ◽  
Anita M. Tuomainen ◽  
Matti Jauhiainen ◽  
...  
Keyword(s):  
Bone Loss ◽  
Matrix Metalloproteinase ◽  
Porphyromonas Gingivalis ◽  
Alveolar Bone ◽  
Inflammatory Responses ◽  
Density Lipoprotein ◽  
Alveolar Bone Loss ◽  
Type I ◽  
Site Specific ◽  
Vldl Particle

ABSTRACT Periodontitis is a bacterium-induced chronic inflammation that destroys tissues that attach teeth to jaw bone. Pathologically excessive matrix metalloproteinase 8 (MMP-8) is among the key players in periodontal destruction by initiating type I collagen degradation. We studied MMP-8 in Porphyromonas gingivalis-induced periodontitis by using MMP-8-deficient (MMP8 −/− ) and wild-type (WT) mice. Alveolar bone loss, inflammatory mediator expression, serum immunoglobulin, and lipoprotein responses were investigated to clarify the role of MMP-8 in periodontitis and systemic inflammatory responses. P. gingivalis infection induced accelerated site-specific alveolar bone loss in both MMP8 −/− and WT mice relative to uninfected mice. The most extensive bone degradation took place in the P. gingivalis-infected MMP8 −/− group. Surprisingly, MMP-8 significantly attenuated (P < 0.05) P. gingivalis-induced site-specific alveolar bone loss. Increased alveolar bone loss in P. gingivalis-infected MMP8 −/− and WT mice was associated with increase in gingival neutrophil elastase production. Serum lipoprotein analysis demonstrated changes in the distribution of high-density lipoprotein (HDL) and very-low-density lipoprotein (VLDL) particles; unlike the WT mice, the MMP8 −/− mice underwent a shift toward a smaller HDL/VLDL particle sizes. P. gingivalis infection increased the HDL/VLDL particle size in the MMP8 −/− mice, which is an indicator of lipoprotein responses during systemic inflammation. Serum total lipopolysaccharide activity and the immunoglobulin G-class antibody level in response to P. gingivalis were significantly elevated in both infected mice groups. Thus, MMP-8 appears to act in a protective manner inhibiting the development of bacterium-induced periodontal tissue destruction, possibly through the processing anti-inflammatory cytokines and chemokines. Bacterium-induced periodontitis, especially in MMP8 −/− mice, is associated with systemic inflammatory and lipoprotein changes that are likely involved in early atherosclerosis.

Blockade of sympathetic β-receptors inhibits Porphyromonas gingivalis-induced alveolar bone loss in an experimental rat periodontitis model

2010 ◽  
Vol 55 (7) ◽  
pp. 502-508 ◽  
Author(s):  
Yuka Okada ◽  
Nobushiro Hamada ◽  
Yul Kim ◽  
Yusuke Takahashi ◽  
Kenichi Sasaguri ◽  
...  
Keyword(s):  
Bone Loss ◽  
Porphyromonas Gingivalis ◽  
Alveolar Bone ◽  
Alveolar Bone Loss
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