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Wang TH, Watanabe K, Hamada N, Tani-Ishii N. Role of MAPKs in TGF-β1-induced maturation and mineralization in human osteoblast-like cells. J Oral Biosci 2024; 66:61-67. [PMID: 38110177 DOI: 10.1016/j.job.2023.12.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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] [Received: 10/06/2023] [Revised: 12/14/2023] [Accepted: 12/14/2023] [Indexed: 12/20/2023]
Abstract
OBJECTIVES Our study aimed to clarify the role of mitogen-activated protein kinases (MAPKs) in transforming growth factor (TGF)-β1-stimulated mineralization in the human osteoblast-like MG63 cells. METHODS The viability of MG63 cells under TGF-β1 stimulation was assessed by MTS assay. Western blotting determined TGF-β1-mediated activation of extracellular signal-related protein kinase (ERK), p38, and c-Jun amino-terminal kinase (JNK). Mineralization-related gene expression was examined by quantitative real-time PCR, and mineral deposition levels were evaluated by alizarin red S staining. RESULTS TGF-β1 had no effect on MG63 cell proliferation. Activation of p38 was observed at 3 h post TGF-β1 stimulation. Moreover, JNK phosphorylation was upregulated by TGF-β1 from 1 to 6 h post stimulation, but had no activation on ERK phosphorylation throughout the experimental period. Treatment with JNK inhibitor diminished the alizarin red S-stained area in a dose-dependent manner. Mineral deposition was unaffected by MEK inhibitor, whereas p38 inhibitor increased the red-stained area. Gene expression levels of ALP and BSP were significantly decreased under treatment with JNK inhibitor and p38 inhibitor. The MEK inhibitor had no effect on the TGF-β1-mediated upregulation of ALP and BSP. Although all three inhibitors suppressed expression of COL I, none were found to stimulate expression of OCN. CONCLUSIONS Human osteoblast-like MG63 cells maturation and mineralization are induced through JNK activation of MAPK signaling in response to TGF-β1.
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Affiliation(s)
- Ting-Hsuan Wang
- Department of Pulp Biology and Endodontics, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, 238-8580, Japan
| | - Kiyoko Watanabe
- Department of Liberal Arts Education, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, 238-8580, Japan
| | - Nobushiro Hamada
- Department of Oral Microbiology, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, 238-8580, Japan
| | - Nobuyuki Tani-Ishii
- Department of Pulp Biology and Endodontics, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, 238-8580, Japan.
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Koura Y, Tomiyama K, Kunimatsu Y, Hamada N, Mukai Y. Microbial shift of oral biofilm associated with remineralization of root dentin lesions. Am J Dent 2024; 37:47-52. [PMID: 38458983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/10/2024]
Abstract
PURPOSE To examine the relationship between remineralization of incipient root dentin lesions and the presence of polymicrobial biofilms, as well as examine changes in microbial composition. METHODS Bovine root dentin disks used as specimens for biofilm formation, were cultured using saliva from a single donor. Amsterdam Active Attachment biofilm model was used to grow biofilms. The culture medium was McBain 2005 with 0.2% sucrose and 0.4 ppm F as sodium fluoride. After cultivation for 48 hours to achieve demineralization, a control group (n=10) was obtained and the other specimens were further cultured for 336 hours in two types of remineralization culture medium, with sucrose (S+) and without sucrose (S-), through continuous anaerobic incubation (10% CO2,10% H2, 80% N2). Then half of the specimens cultured in the S- medium were transferred to the S+ medium for an additional 48 hours resulting in three experimental groups S(+) (n=10), S(-) (n=10), and S(-)de (n=10), respectively. Experiment 1: Transverse microradiography (TMR) analysis - Immediately after respective culture treatments, integrated mineral loss (IML) and lesion depth (LD) in the dentin specimens were analyzed by TMR. Experiment 2: Microbiome analysis - Sequence data of the 16S rRNA gene of each sample was obtained using MiSeq, and partial base sequences were determined. Next-generation sequencing was performed to determine the taxonomic groups of fungi present in the biofilm samples. RESULTS Experiment 1: In the control group, formation of dentin demineralization lesions by polymicrobial species biofilms was confirmed. The S(-) group showed significantly decreased IML and shallower LD compared to the control group. The S(-)de group showed a significant increase in IML and LD compared to the S(-) group. Experiment 2: There were statistically significant differences in microbiome between the control group and each of the three experimental groups, both at the genus and species levels. A significant difference in genus was observed between the S(-) group and the S(-)de group. CLINICAL SIGNIFICANCE The confirmation of the possibility of microbial shift occurring during the remineralization process of root caries will lead to the development of new remineralization therapies.
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Affiliation(s)
- Yuna Koura
- Department of Restorative Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Kiyoshi Tomiyama
- Department of Restorative Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Yuichi Kunimatsu
- Department of Restorative Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Nobushiro Hamada
- Department of Oral Microbiology, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Yoshiharu Mukai
- Department of Restorative Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan,
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Lee S, Haraga H, Satoh T, Mutoh N, Watanabe K, Hamada N, Tani-Ishii N. Effect of periodontitis induced by Fusobacterium nucleatum on the microbiota of the gut and surrounding organs. Odontology 2024; 112:177-184. [PMID: 37432500 DOI: 10.1007/s10266-023-00827-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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] [Received: 07/26/2022] [Accepted: 06/06/2023] [Indexed: 07/12/2023]
Abstract
Detection of the oral bacterium Fusobacterium nucleatum in colorectal cancer tissues suggests that periodontitis may alter gut microbiota. The purpose of this study was to analyze the influence and infection route of periodontal inflammation caused by F. nucleatum, and microbiota of the gut and surrounding organs (heart, liver, kidney). Wistar female rats were orally inoculated with F. nucleatum to establish an experimental periodontitis model that was confirmed by X-ray imaging and histopathological analysis. The mandibles, gut, liver, heart, and kidneys were collected from the experimental group at 2, 4, and 8 weeks, and from the uninfected control group at 0 weeks, for DNA extraction for PCR amplification and comprehensive microbiota analysis using the Illumina MiSeq platform. Imaging confirmed the onset of periodontitis at 2 weeks post-inoculation, and histopathology showed inflammatory cell infiltration from 2 to 8 weeks. PCR and comprehensive microbiota analysis showed the presence of F. nucleatum in the heart and liver at 2 weeks, and in the liver at 4 and 8 weeks. There were changes of microbiota of the gut, heart, liver, and kidneys at 4 weeks: namely, decreased Verrucomicrobia and Bacteroidetes, and increased Firmicutes. F. nucleatum induced the onset of periodontitis and infected the heart and liver in rats. As the periodontic lesion progressed, the microbiota of the gut, liver, heart, and kidneys were altered.
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Affiliation(s)
- Sangmin Lee
- Department of Pulp Biology and Endodontics, Kanagawa Dental University, 82. Inaoka-Cho, Yokosuka, Kanagawa, 238-8580, Japan
| | - Hiroshi Haraga
- Department of Pulp Biology and Endodontics, Kanagawa Dental University, 82. Inaoka-Cho, Yokosuka, Kanagawa, 238-8580, Japan
- Ministry of Defense Japan Self-Defense Forces Hospital Yokosuka, 1766-1 Tauraminato-Cho, Yokosuka, Kanagawa, 237-0071, Japan
| | - Takenori Satoh
- Department of Molecular-Biology, Kanagawa Dental University, 82. Inaoka-Cho, Yokosuka, Kanagawa, 238-8580, Japan
| | - Noriko Mutoh
- Department of Pulp Biology and Endodontics, Kanagawa Dental University, 82. Inaoka-Cho, Yokosuka, Kanagawa, 238-8580, Japan
| | - Kiyoko Watanabe
- Department of Oral Microbiology, Kanagawa Dental University, 82. Inaoka-Cho, Yokosuka, Kanagawa, 238-8580, Japan
| | - Nobushiro Hamada
- Department of Oral Microbiology, Kanagawa Dental University, 82. Inaoka-Cho, Yokosuka, Kanagawa, 238-8580, Japan
| | - Nobuyuki Tani-Ishii
- Department of Pulp Biology and Endodontics, Kanagawa Dental University, 82. Inaoka-Cho, Yokosuka, Kanagawa, 238-8580, Japan.
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Kariu T, Hamada N, Lakshmyya K. Luteolin inhibits Porphyromonas gingivalis growth and alleviates alveolar bone destruction in experimental murine periodontitis. Biosci Biotechnol Biochem 2023; 88:37-43. [PMID: 37740573 DOI: 10.1093/bbb/zbad137] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 09/16/2023] [Indexed: 09/24/2023]
Abstract
Periodontal disease is a major oral infectious disease that destroys alveolar bones and causes tooth loss. Porphyromonas gingivalis is a key pathogen that plays a crucial role in periodontitis. In our previous study on the anti-P. gingivalis activity of flavonoid, luteolin, a major flavonoid in edible plants, inhibited the proteolytic activity of gingipains, the major virulence factor in P. gingivalis. This study demonstrated luteolin in vitro and in vivo anti-bacterial activities. Thus, luteolin inhibits planktonic growth and biofilm formation in P. gingivalis. Furthermore, oral administration of luteolin alleviated maxillary alveolar bone resorption (ABR) in murine periodontitis induced by P. gingivalis infection. These results indicate that luteolin may be a potential therapeutic compound that targets P. gingivalis by hindering its growth, biofilm formation, and ABR in the oral cavity.
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Affiliation(s)
- Toru Kariu
- Department of Life Science, Shokei University, Kumamoto, Japan
| | - Nobushiro Hamada
- Department of Oral Microbiology, Kanagawa Dental University, Kanagawa, Japan
| | - Kesavalu Lakshmyya
- Department of Periodontology, College of Dentistry, University of Florida, Gainesville, FL, USA
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Tamiya J, Sakaguchi W, Nakagawa K, Yamamoto T, Saruta J, Kubota N, Kawata A, Hasegawa I, Hamada N, Tsukinoki K. Detection of SARS-CoV-2 and Its Related Factors on the Mucosal Epithelium of the Tongue. Acta Histochem Cytochem 2023; 56:29-37. [PMID: 37124954 PMCID: PMC10139837 DOI: 10.1267/ahc.22-00089] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 10/10/2022] [Accepted: 12/13/2022] [Indexed: 05/02/2023] Open
Abstract
SARS-CoV-2 infects a variety of tissues, including the oral cavity. However, there are few reports examining the association of SARS-CoV-2 with tongue mucosal tissues with sticky tongue debris. This study investigated the presence of SARS-CoV-2 and its associated molecules by dissecting tongue tissue from autopsy specimens of 23 patients who died of COVID-19-related illness (pneumonia). Immunohistochemical staining, electron microscopy, and PCR analysis were performed on the tongue tissue specimens. The mucosal epithelium of the tongue formed a very thick keratinized with well-developed filiform papillae in all cases. ACE2 and TMPRSS2 were consistently co-expressed in all samples in the epithelium. The S-protein was strongly expressed in basal cells and the epithelial surface. S-protein-positive viral particles were detected in the tongue's stratified squamous epithelium via an immunoelectron microscope. Based on PCR amplification of the N1 and N2 regions, the SARS-CoV-2 gene was detected on the tongue epithelium, tongue submucosa, and in tongue debris. This suggests that tongue debris, including the squamous epithelial tissue, could be a source of SARS-CoV-2 in saliva. Furthermore, removing tongue debris may decrease the amount of SARS-CoV-2 in the oral cavity.
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Affiliation(s)
- Jun Tamiya
- Department of Pathology and Histomorphology, Kanagawa Dental University, 82 Inaoka, Yokosuka, Kanagawa 238–8580, Japan
| | - Wakako Sakaguchi
- Department of Pathology and Histomorphology, Kanagawa Dental University, 82 Inaoka, Yokosuka, Kanagawa 238–8580, Japan
| | - Kimiko Nakagawa
- Department of Forensic Medicine, Kanagawa Dental University, 82 Inaoka, Yokosuka, Kanagawa 238–8580, Japan
| | - Toshiharu Yamamoto
- Department of Dentistry, Kanagawa Dental University, 82 Inaoka, Yokosuka, Kanagawa 238–8580, Japan
| | - Juri Saruta
- Department of Education Planning, Kanagawa Dental University, 82 Inaoka, Yokosuka, Kanagawa 238–8580, Japan
| | - Nobuhisa Kubota
- Department of Diagnostic Pathology, Kanagawa Dental University, 82 Inaoka, Yokosuka, Kanagawa 238–8580, Japan
| | - Akira Kawata
- Department of Pathology and Histomorphology, Kanagawa Dental University, 82 Inaoka, Yokosuka, Kanagawa 238–8580, Japan
| | - Iwao Hasegawa
- Department of Forensic Medicine, Kanagawa Dental University, 82 Inaoka, Yokosuka, Kanagawa 238–8580, Japan
| | - Nobushiro Hamada
- Department of Oral Microbiology, Kanagawa Dental University, 82 Inaoka, Yokosuka, Kanagawa 238–8580, Japan
| | - Keiichi Tsukinoki
- Department of Pathology and Histomorphology, Kanagawa Dental University, 82 Inaoka, Yokosuka, Kanagawa 238–8580, Japan
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Tomiyama K, Ishizawa M, Watanabe K, Kawata A, Hamada N, Mukai Y. Antibacterial effects of surface pre-reacted glass-ionomer (S-PRG) filler eluate on polymicrobial biofilms. Am J Dent 2023; 36:91-94. [PMID: 37076299] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Subscribe] [Scholar Register] [Indexed: 04/21/2023]
Abstract
PURPOSE To analyze the effects of surface pre-reacted glass-ionomer (S-PRG) filler eluate on polymicrobial biofilm metabolism and live bacterial count. METHODS Biofilm was formed using glass disks 12 mm in diameter and 150 µm in thickness. Stimulated saliva was diluted 50-fold with buffered McBain 2005 and cultured in anaerobic conditions at 37°C for 24 hours in anaerobic conditions (10% CO₂, 10% H₂, 80% N₂) to form the biofilm on the glass disks. Following this, biofilms were treated with (1) sterilized deionized water (control), (2) 0.2% chlorhexidine digluconate (0.2CX), (3) S-PRG eluate diluted to 10% (10% S-PRG),(4) 20% S-PRG,(5) 40% S-PRG,(6) 80% S-PRG,and (7) S-PRG for 15 minutes (n= 10 per group), and samples were subdivided into two groups for measuring live bacterial count immediately after treatment and after 48 hours of culturing after treatment. The pH of the spent medium collected at the time of culture medium exchange was tested. RESULTS Immediately after treatment, the live bacterial count of samples treated with drug solutions was significantly lower than the control (8.2 × 10⁸), and the counts of samples treated with 0.2CX (1.3 × 10⁷) and S-PRG (1.4 × 10⁷) were significantly lower than those treated with diluted S-PRG (4.4 × 10⁷-1.4 x 10⁸). When the medium was measured again after culturing for 48 hours, growth was continually inhibited in all treatment groups and the bacterial count of samples treated with S-PRG (9.2 x 10⁷) was significantly lower than that of samples treated with 0.2CX (1.8 × 10⁸). The pH of spent medium immediately after treatment was significantly higher in groups treated with drug solutions (5.5-6.8) than the controls (4.2), and it was highest in the S-PRG-treated group (6.8). Thereafter, when culturing was continued for 48 hours, the pH of all treated groups decreased; however, the pH of the S-PRG-treated group was significantly higher than groups treated with other drug solutions. CLINICAL SIGNIFICANCE Surface pre-reacted glass-ionomer (S-PRG) filler eluate not only reduced the live bacterial count of polymicrobial biofilm, but also continuously inhibited the lowering of pH.
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Affiliation(s)
- Kiyoshi Tomiyama
- Department of Restorative Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Masato Ishizawa
- Department of Restorative Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Kiyoko Watanabe
- Department of Oral Microbiology, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Akira Kawata
- Department of Molecular Oral Histology, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Nobushiro Hamada
- Department of Oral Microbiology, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Yoshiharu Mukai
- Department of Restorative Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan,
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Imaizumi U, Inaba K, Kurahashi A, Kuroda H, Sanuki T, Yoshida A, Yoshino F, Hamada N. Effectiveness of curcumin-based antimicrobial photodynamic therapy against Staphylococcus aureus. J Oral Sci 2023; 65:270-274. [PMID: 37778986 DOI: 10.2334/josnusd.23-0183] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [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: 10/03/2023]
Abstract
PURPOSE This study investigated the effectiveness of curcumin-based antimicrobial photodynamic therapy (aPDT) against Staphylococcus aureus (S. aureus), the causative agent of ventilator-associated pneumonia. METHODS Curcumin was added to S. aureus culture medium at concentrations of 25, 2.5, and 0.25 µM. After 60 min (20-25°C), each culture was irradiated for 1 and 3 min, and viable bacteria were counted. Curcumin (25 µM) was also added to a bacterial suspension with D-mannitol and sodium azide; microbial counts were determined after irradiation for 3 min. RESULTS S. aureus was significantly reduced in the 1-min (P = 0.043) and 3-min (P = 0.011) irradiation groups in comparison to the 0-min irradiation group with 25 µM curcumin. No significant differences were observed between the curcumin alone group and the curcumin plus D-mannitol or sodium azide group. CONCLUSION The findings of this study indicate that prolonged exposure (≥1 min) of S. aureus to LED in 25 μM curcumin solution induces cell wall injury. Curcumin-based aPDT as an adjunct to conventional oral care, employing existing dentistry equipment, offers a promising approach that does not rely on antimicrobial drugs or allows the emergence of resistant bacterial strains. This suggests its potential role in future strategies aimed at preventing ventilator-associated pneumonia.
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Affiliation(s)
- Uno Imaizumi
- Department of Dental Anesthesiology, Kanagawa Dental University
| | - Keitaro Inaba
- Department of Oral Microbiology, Kanagawa Dental University
| | | | - Hidetaka Kuroda
- Department of Dental Anesthesiology, Kanagawa Dental University
| | - Takuro Sanuki
- Department of Dental Anesthesiology, Kanagawa Dental University
| | - Ayaka Yoshida
- Department of Dental Education, Kanagawa Dental University
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Honma K, Sasaki H, Hamada N, Sharma A. An Extracytoplasmic Function Sigma/Anti-Sigma Factor System Regulates β-Glucanase Expression in Tannerella forsythia in Response to Fusobacterium nucleatum Sensing. J Bacteriol 2022; 204:e0031322. [PMID: 36448787 PMCID: PMC9765289 DOI: 10.1128/jb.00313-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2022] [Accepted: 10/26/2022] [Indexed: 12/02/2022] Open
Abstract
The periodontal pathogen Tannerella forsythia expresses a β-glucanase (TfGlcA) whose expression is induced in response to Fusobacterium nucleatum, a bridge bacterium of the oral cavity. TfGlcA cleaves β-glucans to release glucose, which can serve as a carbon source for F. nucleatum and other cohabiting organisms. A two-gene cluster encoding a putative extracytoplasmic function (ECF) sigma factor and a FecR-like anti-sigma factor has been recognized upstream of a TfGlcA operon. We characterized and analyzed the role of these putative ECF sigma and anti-sigma factors in the regulation of TfGlcA expression. For this purpose, deletion mutants were constructed and analyzed for β-glucanase expression. In addition, an Escherichia coli-produced ECF sigma factor recombinant protein was evaluated for transcriptional and DNA binding activities. The results showed that the recombinant protein promoted transcription by the RNA polymerase core enzyme from the glcA promoter. Furthermore, in comparison to those in the parental strain, the β-glucanase expression levels were significantly reduced in the ECF sigma-factor deletion mutant and increased significantly in the FecR anti-sigma factor deletion mutant. The levels did not change in the mutants following coincubation with the F. nucleatum whole cells or cell extracts. Finally, the levels of β-glucanase produced by T. forsythia strains paralleled F. nucleatum biomass in cobiofilms. In conclusion, we identified a β-glucanase operon regulatory system in T. forsythia comprising an ECF sigma factor (TfSigG) and a cognate FecR-like anti-sigma factor responsive to F. nucleatum and potentially other stimuli. IMPORTANCE Previous studies have shown that F. nucleatum forms robust biofilms with T. forsythia utilizing glucose from the hydrolysis of β-glucans by T. forsythia β-glucanase, induced by F. nucleatum. In this study, we showed that a regulatory system comprising of an ECF sigma factor, TfSigG, and a FecR-like anti-sigma factor, TfFecR, is responsible for the β-glucanase induction in response to F. nucleatum, suggesting that this system plays roles in the mutualistic interactions of T. forsythia and F. nucleatum. The findings suggest the development and potential utility of small-molecule inhibitors targeting the β-glucanase activity or the TfSigG/TfFecR system as therapeutic drugs against dental plaque formation and periodontitis.
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Affiliation(s)
- Kiyonobu Honma
- Department of Oral Biology, University at Buffalo, State University of New York, Buffalo, New York, USA
| | - Haruka Sasaki
- Department of Oral Biology, University at Buffalo, State University of New York, Buffalo, New York, USA
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Ashu Sharma
- Department of Oral Biology, University at Buffalo, State University of New York, Buffalo, New York, USA
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Kamata Y, Kessoku T, Shimizu T, Sato S, Kobayashi T, Kurihashi T, Morozumi T, Iwasaki T, Takashiba S, Hatanaka K, Hamada N, Kodama T, Higurashi T, Taguri M, Yoneda M, Usuda H, Wada K, Nakajima A, Minabe M. Periodontal Treatment and Usual Care for Nonalcoholic Fatty Liver Disease: A Multicenter, Randomized Controlled Trial. Clin Transl Gastroenterol 2022; 13:e00520. [PMID: 36000999 PMCID: PMC10476832 DOI: 10.14309/ctg.0000000000000520] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/19/2022] [Accepted: 07/06/2022] [Indexed: 01/31/2023] Open
Abstract
INTRODUCTION Periodontal disease is associated with nonalcoholic fatty liver disease (NAFLD). We evaluated periodontal treatment efficacy in patients with NAFLD and periodontal disease. METHODS This multicenter, 2-arm, randomized study recruited adult patients with NAFLD and periodontitis, alanine aminotransferase levels ≥40 U/L, and equivalent steatosis grade ≥1. Forty eligible patients (18 men and 22 women) were randomly assigned to 2 groups (scaling and root planning [SRP; n = 20] and tooth brushing [n = 20] groups) stratified by age and sex. The primary and secondary endpoints were changes in alanine aminotransferase levels and serum Porphyromonas gingivalis IgG antibody titers from baseline to 12 weeks, respectively. Efficacy analysis was performed using an intention-to-treat approach ( t test). This trial was registered with the University Hospital Medical Information Network Clinical Trials Registry (UMIN000022079). RESULTS We observed a significantly higher decrease in absolute alanine aminotransferase levels and P. gingivalis IgG antibody titers in the SRP group than in the tooth brushing group (-12 vs 1 U/L; mean difference [δ], -12; 95% confidence interval [CI], -20 to -5; P = 0.002). The decrease in P. gingivalis IgG antibody titer was significantly higher in the SRP group than in the tooth brushing group (FDC381, -1.6 [2.5]; δ, -1.6; 95% CI, -2.7 to -0.4; P = 0.0092; SU63, -1.7 [2.0]; δ, -1.7; 95% CI, -2.7 to -0.7). No life-threatening events or treatment-related deaths occurred. DISCUSSION Periodontal treatment induced significant short-term and mid-term reductions in liver enzyme levels and antibody titers. Further research is warranted to clearly define SRP efficacy and tolerability in patients with NAFLD and periodontitis.
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Affiliation(s)
- Yohei Kamata
- Department of Highly Advanced Oral Stomatology, Yokohama Clinic, Kanagawa Dental University, Yokohama, Japan
| | - Takaomi Kessoku
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Tomoko Shimizu
- Department of Highly Advanced Oral Stomatology, Yokohama Clinic, Kanagawa Dental University, Yokohama, Japan
| | - Satsuki Sato
- Department of Highly Advanced Oral Stomatology, Yokohama Clinic, Kanagawa Dental University, Yokohama, Japan
| | - Takashi Kobayashi
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Takeo Kurihashi
- Department of Internal Medicine, Yokohama Clinic, Kanagawa Dental University, Yokohama, Japan
| | - Toshiya Morozumi
- Division of Periodontology, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Japan
| | - Tomoyuki Iwasaki
- Iwasaki Internal Medicine Clinic, Kamihoshikawa, Hodogaya-ku, Yokohama, Japan
| | - Shogo Takashiba
- Department of Pathophysiology—Periodontal Science, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Kazu Hatanaka
- Department of Pathophysiology—Periodontal Science, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Japan
| | - Toshiro Kodama
- Department of Implantology and Periodontology, Graduate School of Dentistry, Kanagawa Dental University, Yokohama, Japan
| | - Takuma Higurashi
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Masataka Taguri
- Department of Biostatistics, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Masato Yoneda
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Haruki Usuda
- Department of Pharmacology, Shimane University School of Medicine, Shimane, Japan
| | - Koichiro Wada
- Department of Pharmacology, Shimane University School of Medicine, Shimane, Japan
| | - Atsushi Nakajima
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, Yokohama, Japan
| | - Masato Minabe
- Division of Periodontology, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Japan
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Li X, Guo L, Sato F, Kitayama T, Tewari N, Makishima M, Hamada N, Liu Y, Bhawal UK. Dec2 negatively regulates bone resorption in periodontitis. J Periodontal Res 2022; 57:1056-1069. [DOI: 10.1111/jre.13046] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2022] [Revised: 07/01/2022] [Accepted: 07/30/2022] [Indexed: 10/15/2022]
Affiliation(s)
- Xiaoyan Li
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology Capital Medical University Beijing China
| | - Lijia Guo
- Department of Orthodontics, School of Stomatology Capital Medical University Beijing China
| | - Fuyuki Sato
- Pathology Division Shizuoka Cancer Center Shizuoka Japan
| | - Toshiyasu Kitayama
- Department of Anesthesiology Nihon University School of Dentistry Tokyo Japan
| | - Nitesh Tewari
- Division of Pedodontics and Preventive Dentistry Centre for Dental Education and Research, All India Institute of Medical Sciences New Delhi India
| | - Makoto Makishima
- Division of Biochemistry, Department of Biomedical Sciences Nihon University School of Medicine Tokyo Japan
| | - Nobushiro Hamada
- Department of Oral Microbiology Kanagawa Dental University Yokosuka Japan
| | - Yi Liu
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology Capital Medical University Beijing China
- Immunology Research Center for Oral and Systematic Health, Beijing Friendship Hospital Capital Medical University Beijing China
| | - Ujjal K. Bhawal
- Department of Biochemistry and Molecular Biology Nihon University School of Dentistry at Matsudo Chiba Japan
- Department of Pharmacology, Saveetha Dental College Saveetha Institute of Medical and Technical Sciences Chennai India
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11
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Sato S, Kamata Y, Kessoku T, Shimizu T, Kobayashi T, Kurihashi T, Takashiba S, Hatanaka K, Hamada N, Kodama T, Higurashi T, Taguri M, Yoneda M, Usuda H, Wada K, Nakajima A, Morozumi T, Minabe M. A cross-sectional study assessing the relationship between non-alcoholic fatty liver disease and periodontal disease. Sci Rep 2022; 12:13621. [PMID: 35948584 PMCID: PMC9365789 DOI: 10.1038/s41598-022-17917-2] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 08/02/2022] [Indexed: 11/09/2022] Open
Abstract
The risk factors for non-alcoholic fatty liver disease (NAFLD) progression are not completely known. Porphyromonas gingivalis infection is a risk factor for systemic diseases. We investigated the association of P. gingivalis infection with the risk of non-alcoholic steatohepatitis progression. Here, hematological tests, periodontal examination, and saliva collection were performed for 164 patients with NAFLD. P. gingivalis was identified in saliva using polymerase chain reaction. Hepatic steatosis and stiffness were evaluated using vibration-controlled transient elastography (VCTE) and magnetic resonance imaging. In patients with NAFLD, P. gingivalis positivity (P. gingivalis ratio ≥ 0.01%) in saliva correlated with liver stiffness determined using magnetic resonance elastography (MRE; p < 0.0001). A P. gingivalis ratio of 0.01% corresponds to 100,000 cells/mL and indicates the proportion of P. gingivalis in the total number of bacteria in the oral cavity. Patients with NAFLD and advanced fibrosis on MRE showed significantly elevated endotoxin activity; those who had > 10 periodontal pockets with depths ≥ 4 mm had significantly increased hepatic stiffness on both VCTE and MRE.
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Affiliation(s)
- Satsuki Sato
- Department of Highly Advanced Oral Stomatology, Yokohama Clinic, Kanagawa Dental University, 3-31-6 Tsuruya-cho, Kanagawa, Yokohama, Kanagawa, 221-0835, Japan
| | - Yohei Kamata
- Department of Highly Advanced Oral Stomatology, Yokohama Clinic, Kanagawa Dental University, 3-31-6 Tsuruya-cho, Kanagawa, Yokohama, Kanagawa, 221-0835, Japan.
| | - Takaomi Kessoku
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Tomoko Shimizu
- Department of Highly Advanced Oral Stomatology, Yokohama Clinic, Kanagawa Dental University, 3-31-6 Tsuruya-cho, Kanagawa, Yokohama, Kanagawa, 221-0835, Japan
| | - Takashi Kobayashi
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Takeo Kurihashi
- Department of Internal Medicine, Yokohama Clinic, Kanagawa Dental University, 3-31-6 Tsuruya-cho, Kanagawa, Yokohama, Kanagawa, 221-0835, Japan
| | - Shogo Takashiba
- Department of Pathophysiology-Periodontal Science, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama, 700-8525, Japan
| | - Kazu Hatanaka
- Department of Pathophysiology-Periodontal Science, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama, 700-8525, Japan
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa, 238-8580, Japan
| | - Toshiro Kodama
- Department of Implantology and Periodontology, Graduate School of Dentistry, Kanagawa Dental University, 3-31-6 Tsuruya-cho, Kanagawa, Yokohama, Kanagawa, 221-0835, Japan
| | - Takuma Higurashi
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Masataka Taguri
- Department of Biostatistics, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, Kanagawa, 236-0004, Japan
| | - Masato Yoneda
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Haruki Usuda
- Department of Pharmacology, Shimane University School of Medicine, 89-1 Enya-cho Izumo, Shimane, 693-0581, Japan
| | - Koichiro Wada
- Department of Pharmacology, Shimane University School of Medicine, 89-1 Enya-cho Izumo, Shimane, 693-0581, Japan
| | - Atsushi Nakajima
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Toshiya Morozumi
- Division of Periodontology, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa, 238-8580, Japan
| | - Masato Minabe
- Division of Periodontology, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa, 238-8580, Japan
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12
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Haraga H, Satoh T, Watanabe K, Hamada N, Tani-Ishii N. Effect of the progression of Fusobacterium nucleatum-induced apical periodontitis on the gut microbiota. J Endod 2022; 48:1038-1045. [DOI: 10.1016/j.joen.2022.04.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/06/2022] [Revised: 04/16/2022] [Accepted: 04/17/2022] [Indexed: 12/13/2022]
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13
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Yoshida A, Inaba K, Sasaki H, Hamada N, Yoshino F. Impact on Porphyromonas gingivalis of antimicrobial photodynamic therapy with blue light and Rose Bengal in plaque-disclosing solution. Photodiagnosis Photodyn Ther 2021; 36:102576. [PMID: 34628072 DOI: 10.1016/j.pdpdt.2021.102576] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [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] [Received: 02/14/2021] [Revised: 08/26/2021] [Accepted: 10/04/2021] [Indexed: 01/10/2023]
Abstract
OBJECTIVES Antimicrobial photodynamic therapy (aPDT) in periodontal pockets using lasers is difficult to perform in some cases because of the high cost of irradiation equipment and the narrow irradiation field. The purpose of the present study was to examine the effects of aPDT in combination with a plaque-disclosing solution and blue light-emitting diode (LED), which are used for composite resin polymerization. METHODS The reactive oxygen species generated by irradiating 0.001% RB or MB with blue light were analyzed using electron spin resonance spectroscopy. Blue-light exposure was performed at 6.92, 20.76 and 124.6 J. The microorganism to be sterilized was Porphyromonas gingivalis. After aPDT, colony-forming units (CFUs) were measured to estimate cell survival. Carbonylated protein (PC) levels were used to evaluate oxidative stress. All statistical analyses were performed with Tukey's multiple comparisons test or the unpaired t-test. RESULTS Singlet oxygen (1O2) generation was confirmed by RB+blue LED. 1O2 production was significantly greater with the blue LED irradiation of RB than that of MB (p < 0.0001). CFUs were significantly lower in the blue LED-irradiated group than in the non-LED-irradiated group (p < 0.01). The bactericidal effect increased in a time-dependent manner. aPDT increased PC levels. No morphological changes were observed in P. gingivalis. CONCLUSIONS The present results suggest that aPDT exerts bactericidal effects against P. gingivalis by increasing oxidative stress through the generation of 1O2 in cells. Periodontal disease may be treated by aPDT using the equipment available in dental offices.
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Affiliation(s)
- Ayaka Yoshida
- Department of Dental Education, Kanagawa Dental University, 82 Inaoka-cho, Kanagawa, Yokosuka 238-8580, Japan
| | - Keitaro Inaba
- Department of Oral Microbiology, Kanagawa Dental University, 82 Inaoka-cho, Kanagawa, Yokosuka 238-8580, Japan
| | - Haruka Sasaki
- Kanagawa Dental University, 82 Inaoka-cho, Yokosuka 238-8580, Japan
| | - Nobushiro Hamada
- Department of Oral Microbiology, Kanagawa Dental University, 82 Inaoka-cho, Kanagawa, Yokosuka 238-8580, Japan
| | - Fumihiko Yoshino
- Department of Pharmacology, Kanagawa Dental University, 82 Inaoka-cho, Kanagawa, Yokosuka 238-8580, Japan.
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14
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Campos CM, Desiderio GR, Martins RT, Hamada N. The Amazonian shredder caddisfly Phylloicus elektoros Prather, 2003 (Trichoptera: Calamoceratidae): description of the larva and pupa. Studies on Neotropical Fauna and Environment 2021. [DOI: 10.1080/01650521.2021.1933861] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- C. M. Campos
- Divisão do Curso em Entomologia (DiEnt), Instituto Nacional de Pesquisas da Amazônia (INPA), Coordenação de Pós-Graduação (COPOG), Manaus, Brazil
| | - G. R. Desiderio
- Divisão do Curso em Entomologia (DiEnt), Instituto Nacional de Pesquisas da Amazônia (INPA), Coordenação de Pós-Graduação (COPOG), Manaus, Brazil
| | - R. T. Martins
- Divisão do Curso em Entomologia (DiEnt), Instituto Nacional de Pesquisas da Amazônia–INPA, Coordenação de Biodiversidade–COBIO, Manaus, Brazil
| | - N. Hamada
- Divisão do Curso em Entomologia (DiEnt), Instituto Nacional de Pesquisas da Amazônia (INPA), Coordenação de Pós-Graduação (COPOG), Manaus, Brazil
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15
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Katayama T, Sato T, Hamada N, Goda S, Yamaguchi T, Tsukinoki K, Handa K. Effects of Jixueteng on Experimental Periodontitis During Orthodontic Tooth Movement in Rats. Nat Prod Commun 2021. [DOI: 10.1177/1934578x211002419] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023] Open
Abstract
Recently, natural ingredients have focused on the inhibition of bacteria-induced alveolar bone resorption in orthodontic treatment. Jixueteng (Jix), a Chinese traditional medicine, contains several kinds of flavonoids given their biological properties. We evaluated the effects of Jix on experimental periodontitis during orthodontic tooth movement (OTM) in rats. To this end, 9-week-old male Wistar rats, which were equipped with orthodontic appliance, were orally infected with Porphyromonas gingivalis (Pg), while Jix was administered in their drinking water. A total of 28 days after the beginning of OTM, alveolar bone resorption on the right side of the upper jaws was scanned with micro-computed tomography. These were also used as histological specimens and underwent tartrate-resistant acid phosphatase (TRAP) staining. TRAP-positive multinucleated cells were counted as osteoclasts. As a result, the distance of tooth movement in the OTM and Pg infection with Jix administration (OTM + Pg + Jix) group was the same as that of the sham-infected group. The amount of bone resorption and number of osteoclasts in the OTM + Pg + Jix group was more significantly decreased than that in the OTM and Pg-infected group ( P < 0.05). Hence, Jix had little effect on OTM and inhibited Pg-induced alveolar bone destruction. We suggested that the administration of Jix can support tooth movement and contribute to the prevention of periodontitis during orthodontic treatment.
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Affiliation(s)
- Taira Katayama
- Division of Orthodontics, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Takenori Sato
- Division of Oral Biochemistry, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Seiji Goda
- Department of Physiology, Osaka Dental University, Hirakata, Osaka, Japan
| | - Tetsutaro Yamaguchi
- Division of Orthodontics, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Keiichi Tsukinoki
- Division of Environmental Pathology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Keisuke Handa
- Division of Oral Biochemistry, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
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16
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Sato T, Fujimaki R, Suzuki J, Hamada N, Tani-Ishii N, Handa K. Bactericidal Effect of a Novel Alkaline EDTA Root Canal Cleaning Solution. Eur J Dent 2021; 15:546-550. [PMID: 33694134 PMCID: PMC8382451 DOI: 10.1055/s-0041-1723067] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Objectives
In this study, we aimed to evaluate the bactericidal effect and cytotoxicity of an ethylenediaminetetra-acetic acid (EDTA)-based root canal irrigant solution capable of efficiently removing both the organic matter and the smear layer. We prepared a strong alkaline EDTA (AE) solution with an acid buffer capacity similar to that of sodium hypochlorite.
Materials and Methods
AE was used at concentrations of 1%, 2%, and 3%. The bactericidal effect of AE on
Enterococcus faecalis
was evaluated by determining the colony number and biofilm removal rate. Biofilms were visualized using a Live/Dead BacLight bacterial viability kit. Viability of AE-treated cells were determined using a CCK-8 cell counting assay.
Statistical Analysis
One-way analysis of variance followed by a Dunnett’s multiple comparison test were used for comparisons among groups.
Results
Significant reduction in cell viability and biofilm formation were observed in case of 3% and 2% AE. AE exerted bactericidal effects in a concentration-dependent manner. Damage of normal human fibroblasts was not observed at any of the AE concentrations.
Conclusions
Our results suggest that the AE solution could be used as an effective canal irrigant for the removal of bacterial biofilm.
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Affiliation(s)
- Takenori Sato
- Department of Oral Science, Division of Oral Biochemistry, Graduate School of Dentistry, Kanagawa Dental University, Kanagawa, Japan
| | - Ryuji Fujimaki
- Department of Oral Interdisciplinary Medicine, Division of Pulp Biology, Graduate School of Dentistry, Kanagawa Dental University, Kanagawa, Japan
| | - Jiro Suzuki
- Department of Oral Interdisciplinary Medicine, Division of Pulp Biology, Graduate School of Dentistry, Kanagawa Dental University, Kanagawa, Japan
| | - Nobushiro Hamada
- Department of Oral Science, Division of Microbiology, Graduate School of Dentistry, Kanagawa Dental University, Kanagawa, Japan
| | - Nobuyuki Tani-Ishii
- Department of Oral Interdisciplinary Medicine, Division of Pulp Biology, Graduate School of Dentistry, Kanagawa Dental University, Kanagawa, Japan
| | - Keisuke Handa
- Department of Oral Science, Division of Oral Biochemistry, Graduate School of Dentistry, Kanagawa Dental University, Kanagawa, Japan
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17
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Oka S, Li X, Sato F, Zhang F, Tewari N, Kim IS, Zhong L, Hamada N, Makishima M, Liu Y, Bhawal UK. A deficiency of Dec2 triggers periodontal inflammation and pyroptosis. J Periodontal Res 2021; 56:492-500. [PMID: 33641180 DOI: 10.1111/jre.12849] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Revised: 12/14/2020] [Accepted: 12/30/2020] [Indexed: 12/20/2022]
Abstract
BACKGROUND AND OBJECTIVES Periodontal pathogens initiate various diseases and induce inflammatory host responses. The activation of inflammasomes triggers caspase-1 and interleukin (IL)-1β-mediated pyroptosis via gasdermin D (GSDMD). Differentiated embryo chondrocyte 2 (Dec2) is a transcription repressor that controls the expression of genes involved in innate immune and inflammatory responses. However, the effects of Dec2 on inflammasome-induced pyroptosis in periodontal tissues remain elusive. This study aimed to characterize the activation of Dec2 inflammasomes that contribute to P. gingivalis lipopolysaccharide (LPS)-induced pyroptosis and its functional and regulatory importance in periodontal inflammation. MATERIALS AND METHODS Human gingival fibroblasts (HGFs) and human periodontal ligament fibroblasts (HPDLFs) were stimulated with P. gingivalis LPS in vitro. An experimental periodontitis mouse model (wild-type (WT) and Dec2KO) was established to profile periodontal pyroptosis. RESULTS The results demonstrate that P. gingivalis LPS activates caspase-1, caspase-11, and NF-κB in HGFs and in HPDLFs. siRNA knockdown of Dec2 stimulated the induction and further upregulated LPS-induced pyroptosis in HGFs and HPDLFs, resulting in the release of IL-1β. Further, a deficiency of Dec2 alleviated periodontal pyroptosis via the transcriptional induction of GSDMD. In addition, P. gingivalis-induced IL-1β expression and Dec2-deficient mice subsequently increased the inflammatory effect of P. gingivalis in HGFs and in HPDLFs, confirming the importance of Dec2 in the activation of inflammasomes and the regulation of pyroptosis. CONCLUSION Our results demonstrate that Dec2 alleviates periodontal pyroptosis by regulating the expression of NF-κB, caspase-1 and GSDMD, suggesting that Dec2 is a crucial component of inflammasome activation and subsequent pyroptosis.
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Affiliation(s)
- Shunichi Oka
- Department of Anesthesiology, Nihon University School of Dentistry, Tokyo, Japan.,Division of Immunology and Pathology, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan
| | - Xiaoyan Li
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Capital Medical University School of Stomatology, Beijing, China
| | - Fuyuki Sato
- Pathology Division, Shizuoka Cancer Center, Shizuoka, Japan
| | - Fengzhu Zhang
- Department of Anesthesiology, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Nitesh Tewari
- Division of Pedodontics and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Il-Shin Kim
- Department of Dental Hygiene, Honam University, Gwangju, Korea
| | - Liangjun Zhong
- Department of Stomatology, Hangzhou Normal University, Hangzhou, China
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Japan
| | - Makoto Makishima
- Division of Biochemistry, Department of Biomedical Sciences, Nihon University School of Medicine, Tokyo, Japan
| | - Yi Liu
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Capital Medical University School of Stomatology, Beijing, China
| | - Ujjal K Bhawal
- Department of Disaster Medicine and Dental Sociology, Kanagawa Dental University, Yokosuka, Japan.,Department of Biochemistry and Molecular Biology, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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18
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Oka S, Li X, Zhang F, Tewari N, Kim IS, Chen C, Zhong L, Hamada N, Oi Y, Makishima M, Liu Y, Bhawal UK. Loss of Dec1 prevents autophagy in inflamed periodontal ligament fibroblast. Mol Biol Rep 2021; 48:1423-1431. [PMID: 33507476 DOI: 10.1007/s11033-021-06162-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2020] [Accepted: 01/12/2021] [Indexed: 12/14/2022]
Abstract
Periodontal ligament fibroblasts (PDLFs) are integral to the homeostasis of periodontal tissue. The transcription factor Dec1 functions to modulate Porphyromonas gingivalis-induced periodontal inflammation. Here, we aimed to characterize the Dec1-mediated autophagy in PDLFs under inflammatory conditions. Human PDLFs were subjected to an inflammatory environment using P. gingivalis Lipopolysaccaride (LPS) along with Dec1 siRNA in vitro. Quantitative real-time polymerase chain reaction and Western blot analyses were used to evaluate the expression levels of autophagy-related genes and their upstream AKT/mTOR signaling pathways. An experimental P. gingivalis-treated Dec1 knockout (Dec1KO) mouse model was used to confirm the expression of autophagy in PDLFs in vivo. Treatment with P. gingivalis LPS induced the expression of ATG5, Beclin1 and microtubule-associated protein 1 light chain 3 (LC3) and elevated the expression of pro-inflammatory cytokine IL-1β and Dec1 in human PDLFs. Knockdown of Dec1 partly reversed the detrimental influences of LPS on these autophagy markers in human PDLFs. The inhibition of autophagy with Dec1 siRNA suppressed the inflammatory effect of AKT/mTOR signaling pathways following treatment with P. gingivalis LPS. P. gingivalis-treated Dec1KO mice partly reduced autophagy expression. These findings suggest that a Dec1 deficiency can modulate the interaction between autophagy and inflammation in PDLFs.
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Affiliation(s)
- Shunichi Oka
- Department of Anesthesiology, Nihon University School of Dentistry, Tokyo, Japan.,Division of Immunology and Pathology, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan
| | - Xiaoyan Li
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, People's Republic of China.
| | - Fengzhu Zhang
- Department of Anesthesiology, Nihon University School of Dentistry At Matsudo, Chiba, Japan
| | - Nitesh Tewari
- Division of Pedodontics and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Il-Shin Kim
- Department of Dental Hygiene, Honam University, Gwangju, Republic of Korea
| | - Chongchong Chen
- Department of Stomatology, Hangzhou Normal University, Hangzhou, People's Republic of China
| | - Liangjun Zhong
- Department of Stomatology, Hangzhou Normal University, Hangzhou, People's Republic of China
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Japan
| | - Yoshiyuki Oi
- Department of Anesthesiology, Nihon University School of Dentistry, Tokyo, Japan.,Division of Immunology and Pathology, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan
| | - Makoto Makishima
- Division of Biochemistry, Department of Biomedical Sciences, Nihon University School of Medicine, Tokyo, Japan
| | - Yi Liu
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, School of Stomatology, Capital Medical University, Beijing, People's Republic of China
| | - Ujjal K Bhawal
- Department of Biochemistry and Molecular Biology, Nihon University School of Dentistry At Matsudo, Chiba, Japan.
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19
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Oka S, Li X, Zhang F, Tewari N, Wang C, Kim IS, Zhong L, Hamada N, Oi Y, Makishima M, Liu Y, Bhawal UK. Inhibition of Dec1 provides biological insights into periodontal pyroptosis. All Life 2021. [DOI: 10.1080/26895293.2021.1915886] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Affiliation(s)
- Shunichi Oka
- Department of Anesthesiology, Nihon University School of Dentistry, Tokyo, Japan
- Division of Immunology and Pathology, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan
| | - Xiaoyan Li
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Capital Medical University School of Stomatology, Beijing, People’s Republic of China
| | - Fengzhu Zhang
- Department of Anesthesiology, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Nitesh Tewari
- Division of Pedodontics and Preventive Dentistry, Centre for Dental Education and Research, All India Institute of Medical Sciences, New Delhi, India
| | - Chen Wang
- Department of Histology and Embryology, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Il-Shin Kim
- Department of Dental Hygiene, Honam University, Gwangju, Republic of Korea
| | - Liangjun Zhong
- Department of Stomatology, Hangzhou Normal University, Hangzhou, People’s Republic of China
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Japan
| | - Yoshiyuki Oi
- Department of Anesthesiology, Nihon University School of Dentistry, Tokyo, Japan
- Division of Immunology and Pathology, Dental Research Center, Nihon University School of Dentistry, Tokyo, Japan
| | - Makoto Makishima
- Division of Biochemistry, Department of Biomedical Sciences, Nihon University School of Medicine, Tokyo, Japan
| | - Yi Liu
- Laboratory of Tissue Regeneration and Immunology and Department of Periodontics, Beijing Key Laboratory of Tooth Regeneration and Function Reconstruction, Capital Medical University School of Stomatology, Beijing, People’s Republic of China
| | - Ujjal K. Bhawal
- Department of Biochemistry and Molecular Biology, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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Hiramine H, Watanabe K, Inaba K, Sasaki H, Hamada N. Evaluation of Antimicrobial Effects on Dental Impression Materials and Biofilm Removal by Sodium Dichloroisocyanurate. Biocontrol Sci 2021; 26:17-25. [PMID: 33716245 DOI: 10.4265/bio.26.17] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [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: 11/01/2022]
Abstract
Dental materials are inevitably contaminated with oral microorganisms. To prevent transmission of infectious diseases, impressions need to be disinfected. In the present study, we examined the disinfection effects on impression materials and biofilm removal by sodium dichloroisocyanurate (SDIC). Exponentially growing Streptococcus mutans, Escherichia coli, Staphylococcus aureus and Candida albicans, and dental plaque bacteria were suspended in phosphate buffered saline (PBS) and exposed for 1, 5 and 10 min to 1 mL of the 10 ppm, 100 ppm, 1,000 ppm, and 10,000 ppm SDIC solutions. The bactericidal effect was evaluated by colony forming units of each microorganisms. Moreover, the effect of SDIC solution on S. mutans biofilm was examined. Bactericidal effects of SDIC solutions on oral bacteria on dental impression surfaces were assessed and the surface quality of dental casts after immersion in SDIC solution for 30 min was observed under a scanning electron microscope. The number of all bacterial strains, including plaque bacteria, were significantly decreased by SDIC solution treatment in a dose-dependent manner. Significant S. mutans biofilm removing activity of SDIC was observed in 1,000 and 10,000 ppm solution. The number of oral bacteria adhering to the surfaces of impressions markedly decreased following 10-min immersion in the 1,000 ppm SDIC solution. The 30-min immersion of dental impression in the 1,000 ppm SDIC solution did not adversely affect the surface roughness of dental casts. The results indicate that SDIC Solution is useful to deactivate oral bacteria on dental impression.
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Affiliation(s)
- Hiroko Hiramine
- Department of Highly Advanced Stomatology, Graduate School of Dentistry, Kanagawa Dental University
| | - Kiyoko Watanabe
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Keitaro Inaba
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Haruka Sasaki
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Nobushiro Hamada
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
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21
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Nicacio G, Cunha EJ, Hamada N, Juen L. How Habitat Filtering Can Affect Taxonomic and Functional Composition of Aquatic Insect Communities in Small Amazonian Streams. Neotrop Entomol 2020; 49:652-661. [PMID: 32440832 DOI: 10.1007/s13744-020-00780-z] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Accepted: 04/28/2020] [Indexed: 06/11/2023]
Abstract
Responses in taxonomic and functional composition of communities were analysed in small Amazonian streams at the small and large scale (habitat patches, river segment scale, and catchment scale). We hypothesised that similar responses in community structure to local environmental factors were a correlation between taxonomic and functional composition. To evaluate the response of taxonomic composition to environmental variables, redundancy analysis (RDA) and RLQ analysis were performed to investigate the response of community abundance (L) as a function of the environment (R) and traits (Q). The fourth-corner analysis was applied to summarize specific interactions between environmental variables and traits. Then, community taxonomic composition was associated with models at multiple scales of habitat (i.e. riparian/channel, substrates, and water variables). Likewise, the fourth-corner tests and RLQ axes showed associations between trait composition and environmental variables related to variables, such as riparian cover and channel morphology followed by variation in substrate size and composition. Unexpectedly, these results did not show specific associations between unique environmental variables and traits. At last, results showed that local conditions of stream habitat regulated community structure and functional composition of aquatic insects. Thus, these findings indicate that the local environmental filtering appears to be strongly associated with selected species traits adapted to occur in a range of habitat conditions. Despite the low number of analysed streams, these results provide important information for understanding the simultaneous variation in functional trait composition and community composition of aquatic insect assemblages.
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Affiliation(s)
- G Nicacio
- Pós-Graduação em Zoologia, Instituto de Ciências Biológicas, Univ Federal do Pará, Rua Augusto Correia, Bairro Guamá, Belém, Pará, Brasil.
| | - E J Cunha
- Pós-Graduação em Zoologia, Instituto de Ciências Biológicas, Univ Federal do Pará, Rua Augusto Correia, Bairro Guamá, Belém, Pará, Brasil
| | - N Hamada
- Programa de Pós-graduação em Entomologia, Coordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia - INPA, Manaus, AM, Brasil
| | - L Juen
- Pós-Graduação em Zoologia, Instituto de Ciências Biológicas, Univ Federal do Pará, Rua Augusto Correia, Bairro Guamá, Belém, Pará, Brasil
- Instituto de Ciências Biológicas, Univ Federal do Pará, Belém, PA, Brasil
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22
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Ozaki Y, Morozumi T, Watanabe K, Toyama T, Sasaki H, Sato T, Yamamoto Y, To M, Inaba K, Tsukinoki K, Hamada N, Minabe M. Inhibitory effect of omega-3 fatty acids on alveolar bone resorption and osteoclast differentiation. J Oral Sci 2020; 62:298-302. [PMID: 32581177 DOI: 10.2334/josnusd.19-0267] [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] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
In this study, a Porphyromonas gingivalis (P.g.)-infected mouse periodontitis model was used to investigate the effect of omega-3 fatty acid intake on differentiation and maturation of cultured osteoclast. Four-week-old C57BL/6JJcl mice were divided into four groups according to the diets they were fed from the beginning of the experiment (i.e., food containing omega-3 or omega-6 fatty acids) and whether they were orally administered P.g. Thirty-three days after beginning the experiment, bone marrow cells were sampled from the femoral bone of mice from each group and differentiated into osteoclasts; the effects of the ingestion of different fatty acids were subsequently investigated. There was no statistical interaction between the different fatty acids and P.g. infection on the number of osteoclasts (P = 0.6). However, the fatty acid type affected the number of osteoclasts in mice (P = 0.0013), with the omega-3 groups demonstrating lower osteoclast numbers than the omega-6 groups. Furthermore, the addition of resolvin E1 (RvE1), which is an omega-3 fatty acid-derived lipid mediator, suppressed the differentiation of mouse cultured osteoclasts (P < 0.0001). Therefore, the ingestion of omega-3 fatty acids may suppress osteoclast differentiation while inhibiting bone resorption and tissue destruction due to periodontitis.
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Affiliation(s)
- Yu Ozaki
- Division of Periodontology, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University
| | - Toshiya Morozumi
- Division of Periodontology, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University
| | - Kiyoko Watanabe
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Toshizo Toyama
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Haruka Sasaki
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Takenori Sato
- Division of Oral Biochemistry, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Yuko Yamamoto
- Department of Dental Hygiene, Kanagawa Dental University Junior College
| | - Masahiro To
- Division of Dental Anatomy, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Keitaro Inaba
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Keiichi Tsukinoki
- Division of Environmental Pathology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Masato Minabe
- Division of Periodontology, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University
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23
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Ishizawa M, Tomiyama K, Hasegawa H, Hamada N, Mukai Y. Comprehensive analysis of bacterial flora of a biofilm model in initial caries-inducing environment. Am J Dent 2020; 33:55-58. [PMID: 32259407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
PURPOSE To analyze changes in pH and bacterial flora with duration of culture and timing of sugar supply using a polymicrobial biofilm model. METHODS The biofilm was prepared using the method of Exterkate et al. Stimulated saliva from an adult was collected on a glass slide and added to unbuffered McBain medium containing 0.2% sucrose and cultivated under anaerobic conditions for 10 hours. Cultivation continued anaerobically in saliva-free medium refreshed twice daily, with or without sucrose, in five groups: in the Control and Groups A and C, with 0.2% sucrose for 96, 192 and 288 hours, respectively; in Groups B and E, with 0.2% sucrose for 96 hours then, respectively, without for 96 and 192 hours; in Group D, with 0.2% sucrose for 96 hours, without for 96 hours, then with for 96 hours. The pH of all spent medium was measured. Total bacteria counts were determined by Q-PCR. The bacterial composition was determined by next-generation sequencing of 16S rDNA. RESULTS The pH of spent medium depended on the presence or absence of sucrose. Total bacteria counts were higher in A, C and D than the other groups, and markedly lower in Group E. Principal components analysis and cluster analysis showed wider variation of bacterial flora of the biofilm in Groups B, D and E than other groups. CLINICAL SIGNIFICANCE Inspection of bacterial flora of a biofilm model of the initial caries-inducing environment may lead to the development of materials and procedures for the prevention of dental caries.
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Affiliation(s)
- Masato Ishizawa
- Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Kiyoshi Tomiyama
- Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan,
| | - Haruhiko Hasegawa
- Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Nobushiro Hamada
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Yoshiharu Mukai
- Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
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Kamata Y, Kessoku T, Shimizu T, Kobayashi T, Kurihashi T, Sato S, Kuraji S, Aoyama N, Iwasaki T, Takashiba S, Hamada N, Kodama T, Tamura T, Ino S, Higurashi T, Taguri M, Yamanaka T, Yoneda M, Usuda H, Wada K, Nakajima A, Minabe M. Efficacy and safety of PERIOdontal treatment versus usual care for Nonalcoholic liver disease: protocol of the PERION multicenter, two-arm, open-label, randomized trial. Trials 2020; 21:291. [PMID: 32293522 PMCID: PMC7092586 DOI: 10.1186/s13063-020-4201-y] [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] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2019] [Accepted: 02/24/2020] [Indexed: 12/11/2022] Open
Abstract
Background We report the first protocol for a multicenter, randomized comparison study to compare the efficacies of periodontal scaling and root-planing treatment against that of tooth-brushing treatment for nonalcoholic fatty liver disease (NAFLD) (PERION: PERIOdontal treatment for NAFLD). Nonalcoholic steatohepatitis (NASH) is an advanced form of NAFLD, which can progress to cirrhosis and hepatocellular carcinoma. Increased endotoxemia is associated with the progression of NAFLD. Periodontal bacteria possess endotoxins; Porphyromonas gingivalis is well-known as a major pathogenic bacterium in periodontitis, and serum antibody levels for P. gingivalis are high in patients with periodontitis. Several reports have indicated that P. gingivalis is related to NAFLD. This study aims to investigate the effect of periodontal treatment for liver damage, P. gingivalis infection, and endotoxemia on patients with NAFLD. Methods We will include adult patients (20–85 years old) with NAFLD, alanine aminotransferase (ALT) ≥ 40 IU/L, and equivalent steatosis grade ≥ 1 (target sample size, n = 40 patients; planned number of patients with outcome data, n = 32). Participants will be randomly assigned to one of two groups: a scaling and root-planing group or tooth-brushing as the usual group. The primary outcome will be the change in ALT levels from baseline to 12 weeks; the key secondary outcome will be the change in the serum immunoglobulin G (IgG) antibody titer for P. gingivalis at 12 weeks. Discussion This study should determine whether periodontal treatment decreases liver damage, P. gingivalis infection, and endotoxemia in patients with NAFLD. Trial registration University Hospital Medical Information Network (UMIN) Clinical Trials Registry, ID: UMIN000022079.
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Affiliation(s)
- Yohei Kamata
- Department of Highly Advanced Oral Stomatology, Yokohama Clinic, Kanagawa Dental University, 3-31-6 Tsuruya-cho, Kanagawa, Yokohama, Kanagawa, 221-0835, Japan
| | - Takaomi Kessoku
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Tomoko Shimizu
- Department of Highly Advanced Oral Stomatology, Yokohama Clinic, Kanagawa Dental University, 3-31-6 Tsuruya-cho, Kanagawa, Yokohama, Kanagawa, 221-0835, Japan
| | - Takashi Kobayashi
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Takeo Kurihashi
- Department of Internal Medicine, Yokohama Clinic, Kanagawa Dental University, 3-31-6 Tsuruya-cho, Kanagawa, Yokohama, Kanagawa, 221-0835, Japan
| | - Satsuki Sato
- Department of Highly Advanced Oral Stomatology, Yokohama Clinic, Kanagawa Dental University, 3-31-6 Tsuruya-cho, Kanagawa, Yokohama, Kanagawa, 221-0835, Japan
| | - Syotaro Kuraji
- Department of Highly Advanced Oral Stomatology, Yokohama Clinic, Kanagawa Dental University, 3-31-6 Tsuruya-cho, Kanagawa, Yokohama, Kanagawa, 221-0835, Japan
| | - Norio Aoyama
- Division of Periodontology, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa, 238-8580, Japan
| | - Tomoyuki Iwasaki
- Iwasaki Internal Medicine Clinic, 1-1-5 Furu-ruyokohama1F, Kamihoshikawa, Hodogaya-ku Yokohama, Kanagawa, 240-0042, Japan
| | - Shogo Takashiba
- Department of Pathophysiology - Periodontal Science, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences, 2-5-1 Shikata-cho, Kita-ku, Okayama, 700-8525, Japan
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa, 238-8580, Japan
| | - Toshiro Kodama
- Department of Implantology and Periodontology, Graduate School of Dentistry, Kanagawa Dental University, 3-31-6 Tsuruya-cho, Kanagawa, Yokohama, Kanagawa, 221-0835, Japan
| | - Toshiyuki Tamura
- Department of Highly Advanced Oral Stomatology, Yokohama Clinic, Kanagawa Dental University, 3-31-6 Tsuruya-cho, Kanagawa, Yokohama, Kanagawa, 221-0835, Japan
| | - Satoshi Ino
- Division of Prosthetic Dentistry, Department of Highly Advanced Stomatology, Graduate School of Dentistry, Kanagawa Dental University, 3-31-6 Tsuruya-cho, Kanagawa, Yokohama, Kanagawa, 221-0835, Japan
| | - Takuma Higurashi
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Masataka Taguri
- Department of Biostatistics, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Takeharu Yamanaka
- Department of Biostatistics, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Masato Yoneda
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Haruki Usuda
- Department of Pharmacology, Shimane University School of Medicine, 89-1 Enya-cho Izumo, Shimane, 693-0581, Japan
| | - Koichiro Wada
- Department of Pharmacology, Shimane University School of Medicine, 89-1 Enya-cho Izumo, Shimane, 693-0581, Japan
| | - Atsushi Nakajima
- Department of Gastroenterology and Hepatology, Yokohama City University Graduate School of Medicine, 3-9 Fukuura, Kanazawa-ku, Yokohama, 236-0004, Japan
| | - Masato Minabe
- Division of Periodontology, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa, 238-8580, Japan.
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25
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Tomiyama K, Shiiya T, Watanabe K, Hamada N, Mukai Y. Effect of toothpaste containing multiple ions-releasing filler on polymicrobial biofilm regrowth and dentin demineralization. Am J Dent 2019; 32:245-250. [PMID: 31675193] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
PURPOSE To compare the efficacy of toothpaste containing surface pre-reacted glass-ionomer (S-PRG) filler particles to that of conventional sodium fluoride (NaF) toothpaste for the prevention of dentin demineralization and biofilm regrowth. METHODS Bovine root dentin specimens and glass coverslips were used as biofilm growth substrates. To establish biofilms, glass and dentin specimens were incubated for 72 hours in 0.2% sucrose McBain medium inoculated with stimulated saliva from a single donor. Specimens then received a single 5-minute treatment with S-PRG toothpaste, fluoride toothpaste, or sterilized deionized water and were incubated in McBain medium for 120 hours to allow biofilm regrowth. Output parameters during regrowth (72-192 hours) were pH of spent medium, colony-forming unit (CFU) counts of biofilms, and dentin mineral profiles, integrated mineral loss (IML: vol% × µm), and lesion depth (Ld). Treatment group differences were tested by one-way ANOVA followed by Tukey's multiple range test (P< 0.05). RESULTS At 144 hours, medium pH was significantly higher in the S-PRG-treated dentin group than in the NaF-treated dentin group. In addition, at 192 hours, the CFU count, IML, and Ld were lower in the S-PRG-treated dentin group than in the NaF-treated dentin group. There were significant differences of pH among dentin groups at 72 hours. Treatment with S-PRG toothpaste markedly inhibited dentin demineralization compared to that with NaF toothpaste. CLINICAL SIGNIFICANCE Toothpaste containing multiple ions-releasing filler suppressed bacterial viability and inhibited dentin demineralization.
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Affiliation(s)
- Kiyoshi Tomiyama
- Department of Oral Interdisciplinary Medicine, Kanagawa Dental University, Yokosuka, Kanagawa, Japan,
| | - Toru Shiiya
- Department of Oral Interdisciplinary Medicine, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Kiyoko Watanabe
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Nobushiro Hamada
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
| | - Yoshiharu Mukai
- Department of Oral Interdisciplinary Medicine, Kanagawa Dental University, Yokosuka, Kanagawa, Japan
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26
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Sakaguchi W, To M, Yamamoto Y, Inaba K, Yakeishi M, Saruta J, Fuchida S, Hamada N, Tsukinoki K. Detection of anti-citrullinated protein antibody (ACPA) in saliva for rheumatoid arthritis using DBA mice infected with Porphyromonas gingivalis. Arch Oral Biol 2019; 108:104510. [PMID: 31446118 DOI: 10.1016/j.archoralbio.2019.104510] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2019] [Revised: 07/22/2019] [Accepted: 07/28/2019] [Indexed: 01/04/2023]
Abstract
OBJECTIVE The anti-citrullinated protein antibody (ACPA), an autoantibody of rheumatoid arthritis (RA), is very specific in the diagnosis of RA and has been detected in early cases and several years before the onset of the disease. In this study, we focused on ACPA and examined whether it could be detected in saliva whether it is associated with periodontal disease. DESIGN Porphyromonas gingivalis (Pg) or Escherichia coli (Ec) was administered into the oral cavity of DBA/1JJmsSlc mice. The arthritis index was measured in foot bones, and collected saliva and serum. The amount of ACPA in serum and saliva was measured using ELISA, and antibodies in serum, saliva, and foot bones were detected and analysed by western blotting. RESULT Histopathological analysis of foot bones of the Pg/RA group detected greater inflammatory cell infiltration than in the RA group, and bone resorption was evident. Furthermore, ELISA results show that the amount of ACPA in serum was significantly higher in the Pg/RA group (P < 0.05), with a tendency to also increase in the saliva. In addition, western blotting results show a 55 kDa citrullinated protein in the serum and saliva of the RA and Pg/RA groups. CONCLUSIONS We conclude that Pg infection increases ACPA in the serum and is reflected in the saliva, and may be involved in the inflammatory progression of RA.
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Affiliation(s)
- Wakako Sakaguchi
- Department of Oral Science, Division of Environmental Pathology, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan
| | - Masahiro To
- Department of Oral Science, Division of Dental Anatomy, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan
| | - Yuko Yamamoto
- Department of Dental Hygiene, Kanagawa Dental University, Junior College, Kanagawa, Japan
| | - Keitaro Inaba
- Department of Microbiology and Infection, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan
| | - Mayumi Yakeishi
- Department of Pathology, Yokosuka Kyosai Hospital, Kanagawa, Japan
| | - Juri Saruta
- Department of Oral Science, Division of Environmental Pathology, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan
| | - Shinya Fuchida
- Department of Dental Sociology, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan
| | - Nobushiro Hamada
- Department of Microbiology and Infection, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan
| | - Keiichi Tsukinoki
- Department of Oral Science, Division of Environmental Pathology, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan.
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Hidaka K, Mikuni-Takagaki Y, Wada-Takahashi S, Saita M, Kawamata R, Sato T, Kawata A, Miyamoto C, Maehata Y, Watabe H, Tani-Ishii N, Hamada N, Takahashi SS, Deguchi S, Takeuchi R. Low-Intensity Pulsed Ultrasound Prevents Development of Bisphosphonate-Related Osteonecrosis of the Jaw-Like Pathophysiology in a Rat Model. Ultrasound Med Biol 2019; 45:1721-1732. [PMID: 31006496 DOI: 10.1016/j.ultrasmedbio.2019.02.015] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2018] [Revised: 12/21/2018] [Accepted: 02/15/2019] [Indexed: 06/09/2023]
Abstract
We developed a rat model of bisphosphonate-related osteonecrosis of the jaw (BRONJ) by removing a maxillary molar tooth (M1) from ovariectomized rats after treatment with alendronate. To mimic periodontitis, some of the rats were administered Porphyromonas gingivalis (p. gingivalis) at the M1 site every 2 to 3 d for 2 wk. Rats pretreated with alendronate plus p. gingivalis showed delayed healing of socket epithelia, periosteal reaction of alveolar bone formation and lower bone mineral density in the alveolus above adjacent M2 teeth. These abnormalities were prevented by tooth socket exposure to 20 min/d low-intensity pulsed ultrasound (LIPUS), which restored diminished expression of RANKL, Bcl-2, IL-6, Hsp70, NF-κB and TNF-α messenger ribonucleic acids in remote bone marrow, suggesting LIPUS prevented development of BRONJ-like pathophysiology in rat by inducing systemic responses for regeneration, in addition to accelerating local healing. Non-invasive treatment by LIPUS, as well as low-level laser therapy, may be useful for medication-related osteonecrosis of the jaw patients.
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Affiliation(s)
- Kouki Hidaka
- Department of Oral Science, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan; Department of Oral Interdisciplinary Medicine, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan
| | - Yuko Mikuni-Takagaki
- Department of Oral Science, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan.
| | - Satoko Wada-Takahashi
- Department of Oral Science, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan
| | - Makiko Saita
- Department of Oral Interdisciplinary Medicine, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan
| | - Ryota Kawamata
- Department of Dentomaxillofacial Diagnosis and Treatment, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan
| | - Takenori Sato
- Department of Oral Science, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan
| | - Akira Kawata
- Department of Oral Science, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan
| | - Chihiro Miyamoto
- Department of Oral Science, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan
| | - Yojiro Maehata
- Department of Oral Science, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan
| | - Hirotaka Watabe
- Department of Oral Interdisciplinary Medicine, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan
| | - Nobuyuki Tani-Ishii
- Department of Oral Interdisciplinary Medicine, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan
| | - Nobushiro Hamada
- Department of Oral Science, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan
| | - Shun-Suke Takahashi
- Department of Oral Science, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan
| | - Shinji Deguchi
- Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan
| | - Ryohei Takeuchi
- Department of Oral Science, Kanagawa Dental University Graduate School of Dentistry, Yokosuka, Japan; Joint Surgery Center, Kawasaki Saiwai Hospital, Kawasaki, Japan
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28
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Koyata Y, Watanabe K, Toyama T, Sasaki H, Hamada N. Purification and characterization of a fimbrial protein from Porphyromonas salivosa ATCC 49407. J Vet Med Sci 2019; 81:916-923. [PMID: 31019151 PMCID: PMC6612485 DOI: 10.1292/jvms.19-0067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [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] [Indexed: 11/22/2022] Open
Abstract
Periodontal disease is a significant problem in companion animals such as dogs and cats.
However, there is little information available about fimbriae association of periodontal
disease in companion animals. In this study, we have purified and characterized a fimbriae
from Porphyromonas salivosa ATCC 49407. The molecular mass of this
protein was approximately 60-kDa, as estimated by SDS-PAGE. Immunogold electron microscopy
revealed that anti-60-kDa fimbrial serum bound to fimbria on the cell surface of
P. salivosa ATCC 49407. However, fimbriae of P.
gingivalis and P. gulae were not labeled with the same
antibody. Immunoelectron-microscopic studies and immunoblot analysis revealed that
antigenicity and molecular weight were distinct from previously reported
Porphyromonas fimbrial proteins. The amino acid sequence of the
N-terminal 15 residues of the 60-kDa fimbrillin protein revealed only 3 of 15 residues
identical to other Porphyromonas species fimbrillin proteins. Thus, the
N-terminal amino acid sequence of the 60-kDa fimbrillin protein of P.
salivosa clearly differed from previously reported fimbrillin proteins. The
level of adherence of the P. salivosa was 1.81%. It was confirmed that
P. salivosa can adheres to human cells. These results suggest that the
60-kDa fimbriae of P. salivosa ATCC 49407 is a new type of fimbria and
may have an important factor in the adherence host cells. We suggest that the surface
structure of P. salivosa may have a role in the colonization of this
organism in periodontal pockets in companion animals.
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Affiliation(s)
- Yasunori Koyata
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, Yokosuka, Kanagawa 238-8580, Japan
| | - Kiyoko Watanabe
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, Yokosuka, Kanagawa 238-8580, Japan
| | - Toshizo Toyama
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, Yokosuka, Kanagawa 238-8580, Japan
| | - Haruka Sasaki
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, Yokosuka, Kanagawa 238-8580, Japan
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, Yokosuka, Kanagawa 238-8580, Japan
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Shiotsu-Ogura Y, Yoshida A, Kan P, Sasaki H, Toyama T, Izukuri K, Hamada N, Yoshino F. Antimicrobial photodynamic therapy using a plaque disclosing solution on Streptococcus mutans. Photodiagnosis Photodyn Ther 2019; 26:252-257. [PMID: 30951867 DOI: 10.1016/j.pdpdt.2019.04.003] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 03/04/2019] [Accepted: 04/01/2019] [Indexed: 12/21/2022]
Abstract
OBJECTIVES Photodynamic therapy with a bactericidal action is called antimicrobial photodynamic therapy (aPDT),which is a method of staining an object with a photosensitizing dye and then sterilizing by irradiating the dye at it's excitation wavelength. In this study, we aimed to investigate a caries pathogenic bactericidal method in a site difficult to mechanically remove, by examining aPDT effect on Streptococcus mutans (S. mutans), which is a typical caries pathogenic bacteria by applying the plaque disclosing solution as photosensitizing dye. METHODS The absorption wavelength spectrum of irradiating plaque staining agent phloxine B (PB) was analyzed using UV-vis. Reactive oxygen species (ROS) generated by photo excitation with blue LED irradiation was measured by electron spin resonance technique. S. mutans was cultured according to a conventional method and the effect of aPDT after PB staining was evaluated by a Colony Forming Unit (CFU). In addition, protein carbonyl (PC), an oxidative stress marker, was also measured by western blotting. RESULTS Singlet oxygen was generated by PB with blue light. As a result of aPDT treatment on S. mutans under this condition, it was recognized that CFU was suppressed dependent on irradiation intensity of blue light. In addition, the expression of PC was enhanced by aPDT. CONCLUSIONS aPDT is demonstrated by staining S. mutans with PB and irradiating blue light used for resin polymerization and tooth bleaching to generate ROS. Therefore, plaque-disclosing solution-based aPDT against S. mutans might represent a new method for cleaning pit and fissure grooves.
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Affiliation(s)
- Yukako Shiotsu-Ogura
- Division of Photomedical Dentistry, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Ayaka Yoshida
- Division of Photomedical Dentistry, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Powen Kan
- Division of Periodontology, Department of Oral Interdisciplinary Medicine, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Haruka Sasaki
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Toshizo Toyama
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Kazuhito Izukuri
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Fumihiko Yoshino
- Division of Photomedical Dentistry, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan.
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Watanabe S, Toyama T, Sato T, Suzuki M, Morozumi A, Sakagami H, Hamada N. Kampo Therapies and the Use of Herbal Medicines in the Dentistry in Japan. Medicines (Basel) 2019; 6:medicines6010034. [PMID: 30823475 PMCID: PMC6473445 DOI: 10.3390/medicines6010034] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [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: 02/13/2019] [Revised: 02/22/2019] [Accepted: 02/25/2019] [Indexed: 01/03/2023]
Abstract
Dental caries and periodontal disease are two major diseases in the dentistry. As the society is aging, their pathological meaning has been changing. An increasing number of patients are displaying symptoms of systemic disease and so we need to pay more attention to immunologic aggression in our medical treatment. For this reason, we focused on natural products. Kampo consists of natural herbs-roots and barks-and has more than 3000 years of history. It was originated in China as traditional medicine and introduced to Japan. Over the years, Kampo medicine in Japan has been formulated in a way to suit Japan's natural features and ethnic characteristics. Based on this traditional Japanese Kampo medicine, we have manufactured a Kampo gargle and Mastic Gel dentifrice. In order to practically utilize the effectiveness of mastic, we have developed a dentifrice (product name: IMPLA CARE) and treated implant periodontitis and severe periodontitis.
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Affiliation(s)
- Shuji Watanabe
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka 238-8580, Japan.
- Odoriba Medical Center, Totsuka Green Dental Clinic, 1-10-46 Gumizawa, Totsuka-ku, Yokohama 245-0061, Japan.
| | - Toshizo Toyama
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka 238-8580, Japan.
| | - Takenori Sato
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka 238-8580, Japan.
| | - Mitsuo Suzuki
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka 238-8580, Japan.
- Dental Design Clinic, 3-7-10 Kita-aoyama, Minato-ku, Tokyo 107-0061, Japan.
| | - Akira Morozumi
- Morozumi Dental Clinic, 1-3-1 Miyamaedaira, Miyamae-ku, Kawasaki 216-0006, Japan.
| | - Hiroshi Sakagami
- Meikai University Research Institute of Odontology (M-RIO), 1-1 Keyakidai, Sakado, Saitama 350-0283, Japan.
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka 238-8580, Japan.
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Kan P, Sasaki H, Inaba K, Watanabe K, Hamada N, Minabe M. Inhibitory effects of azithromycin on the adherence ability of Porphyromonas gingivalis. J Periodontol 2019; 90:903-910. [PMID: 30690740 DOI: 10.1002/jper.18-0559] [Citation(s) in RCA: 4] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2018] [Revised: 12/07/2018] [Accepted: 12/24/2018] [Indexed: 11/07/2022]
Abstract
BACKGROUND Porphyromonas gingivalis is a major pathogen and has a high detection rate in periodontal disease. Fimbriae and hemagglutinin are expressed by P. gingivalis, and these play an important role in the adherence of the bacteria to periodontal tissue and biofilm formation. The aim of this study was to investigate the effects of sub-minimal inhibitory concentrations (sub-MICs) of azithromycin on the adherence of P. gingivalis, focusing on the inhibition of fimbriae expression and hemagglutinin activity. METHODS P. gingivalis ATCC 33277 were incubated anaerobically with sub-MICs of azithromycin at 37°C by gentle shaking for 18 hours. The bacterial cells were harvested, washed twice with phosphate-buffered saline (PBS), and the proteins analyzed by 12% sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and western blotting. Adherence assay and hemagglutinin activity tests were done with the same culture. RESULTS The results of SDS-PAGE indicated that the sub-MICs of azithromycin inhibited 41-kDa fimbrial protein expression and hemagglutinin activities. The disappearance of 41-kDa fimbrial protein expression and long fimbriae in 0.4 µg/mL, 0.2 µg/mL, and 0.1 µg/mL of azithromycin was confirmed by western blotting and transmission electron microscopy. The adherence of P. gingivalis to human gingival epithelial cells was reduced by sub-MICs of azithromycin compared with the adherence levels without antibiotic. CONCLUSIONS These results suggest that sub-MICs of azithromycin may reduce the adherence of P. gingivalis to host cells, by inhibiting production of fimbriae and hemagglutinin activities. Therefore, azithromycin can be used as a biofilm treatment of periodontal disease caused by P. gingivalis.
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Affiliation(s)
- Powen Kan
- Division of Periodontology, Department of Oral Interdisciplinary Medicine, Kanagawa Dental University, Yokosuka, Japan
| | - Haruka Sasaki
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, Yokosuka, Japan
| | - Keitaro Inaba
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, Yokosuka, Japan
| | - Kiyoko Watanabe
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, Yokosuka, Japan
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science, Kanagawa Dental University, Yokosuka, Japan
| | - Masato Minabe
- Division of Periodontology, Department of Oral Interdisciplinary Medicine, Kanagawa Dental University, Yokosuka, Japan
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Suzuki M, Toyama T, Watanabe K, Sasaki H, Sugiyama S, Yoshino F, Yoshida A, Takahashi SS, Wada-Takahashi S, Matsuo M, Todoki K, Hamada N. Ameliorating Effects of Jixueteng in a Mouse Model of Porphyromonas gingivalis-Induced Periodontitis: Analysis Based on Gingival Microcirculatory System. Nat Prod Commun 2018. [DOI: 10.1177/1934578x1801301230] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Jixueteng, the dried stem of Spatholobus suberectus Dunn (Leguminosae), is a traditional Chinese herbal medicine that promotes blood circulation and can be used to treat blood stasis. In this study, we aimed to investigate the potential of Jixueteng as a preventive and therapeutic drug for periodontitis. We investigated the inhibitory effects of Jixueteng on Porphyromonas gingivalis ( P. gingivalis)-induced gingival circulatory disturbances in mice. Seventy-two male C57BL/6N mice (4-week-old) were randomly divided into the following four groups of 12 mice each. Group 1 served as the P. gingivalis noninfected control (control group). Group 2 was administered Jixueteng extract in drinking water to P. gingivalis noninfected control mice. Group 3 was infected orally with P. gingivalis; and group 4 was administered Jixueteng extract in drinking water and then infected with P. gingivalis. To evaluate the effect of Jixueteng on gingival microcirculation systems, we examined gingival blood flow (GBF) in oral microcirculation in vivo in a mouse model of periodontitis. Gingival reactive hyperemia (GRH) was determined using laser Doppler flowmetry. GRH was elicited by the release of occlusive gingival compression by the laser Doppler probe (diameter 1.0 mm) for 1 min. GRH was estimated by basal blood flow, maximum response (Peak), the time taken for the maximum response to fall to one half (T1/2) and increased total amount of blood flow (Mass). Furthermore, to determine the effect of an oral application of P. gingivalis and/or Jixueteng on GBF and gingival microvessel ultrastructure, morphological analysis of gingival microvessels was performed by using a vascular resin cast model. Administration of Jixueteng to P. gingivalis-infected animals significantly reduced GRH, especially T1/2 and Mass, compared to that in P. gingivalis-infected animals. Alternatively, in the morphological analysis, reduction of the gingival capillary network which resulted from P. gingivalis-infection was improved by Jixueteng administration. Since Jixueteng ameliorates P. gingivalis infection-induced gingival circulatory disturbance, it may be useful in the treatment of P. gingivalis-induced periodontitis.
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Affiliation(s)
- Mitsuo Suzuki
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Toshizo Toyama
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Kiyoko Watanabe
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Haruka Sasaki
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Shuta Sugiyama
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Fumihiko Yoshino
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Ayaka Yoshida
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Shun-suke Takahashi
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Satoko Wada-Takahashi
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Masato Matsuo
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Kazuo Todoki
- Department of Health Science, School of Nursing, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Nobushiro Hamada
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
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Watanabe K, Hiramine H, Toyama T, Hamada N. Effects of French Pine Bark Extract Chewing Gum on Oral Malodor and Salivary Bacteria. J Nutr Sci Vitaminol (Tokyo) 2018; 64:185-191. [PMID: 29962429 DOI: 10.3177/jnsv.64.185] [Citation(s) in RCA: 5] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Frequent or persistent malodor (halitosis) represents a considerable embarrassment to those affected. French pine bark extract, Pycnogenol® (PYC), has displayed antibacterial activity against a broad range of bacterial species. In the present study, anticipated benefits of PYC on diminishing halitosis were investigated. Ten healthy males and 11 females, aged 40.1±12.3 y, were recruited based on threshold breath sulfur compounds presence, diagnosed by portable gas chromatography. Subjects were randomly assigned to either sugar-free gums, or gums bearing an additional 2.5 mg PYC per piece. The subjects were required to consume two pieces of PYC or placebo gum six times daily for 15 min. The levels of volatile sulfur compounds (VSCs), measured by OralChromaTM, and tongue-coating score were recorded at baseline, 2, and 4 wk. Hydrogen sulfide-producing bacteria in saliva were cultured on Brucella blood agar plates containing 0.05% cysteine, 0.12% glutathione, and 0.02% lead acetate. The group consuming PYC chewing gum reduced exhaled hydrogen sulfide, methyl mercaptan and dimethyl sulfide significantly (p<0.01) after 2 wk versus baseline. Continuation of daily PYC-gum consumption for 4 wk remarkably lowered the tongue-coating score and exhaled hydrogen sulfide was significantly decreased compared to the placebo group. PYC chewing gum significantly reduced hydrogen sulfide-producing bacteria in saliva after 4 wk (p<0.01), with no effects observed in the placebo control. The results suggest that PYC chewing gum is effective in reducing oral malodor by decreasing the accumulation of tongue coating and the number of hydrogen sulfide-producing bacteria in saliva.
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Affiliation(s)
| | - Hiroko Hiramine
- Department of Highly Advanced Stomatology, Yokohama Clinical Education Center of Kanagawa Dental University
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Zhang F, Suzuki M, Kim IS, Kobayashi R, Hamada N, Sato F, Bhawal UK. Transcription factor DEC1 is required for maximal experimentally induced periodontal inflammation. J Periodontal Res 2018; 53:883-893. [DOI: 10.1111/jre.12578] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/28/2018] [Indexed: 11/28/2022]
Affiliation(s)
- F. Zhang
- Department of Anesthesiology; Nihon University School of Dentistry at Matsudo; Chiba Japan
| | - M. Suzuki
- Department of Anesthesiology; Nihon University School of Dentistry at Matsudo; Chiba Japan
| | - I. S. Kim
- Department of Dental Hygiene; Honam University; Gwangju Korea
| | - R. Kobayashi
- Department of Microbiology and Immunology; Nihon University School of Dentistry at Matsudo; Chiba Japan
| | - N. Hamada
- Division of Microbiology; Department of Oral Science; Graduate School of Dentistry; Kanagawa Dental University; Yokosuka Japan
| | - F. Sato
- Department of Pathology; Wakayama Medical University School of Medicine; Wakayama Japan
| | - U. K. Bhawal
- Department of Biochemistry and Molecular Biology; Nihon University School of Dentistry at Matsudo; Chiba Japan
- Research Institute of Oral Health; Nihon University School of Dentistry at Matsudo; Chiba Japan
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Teranaka A, Tomiyama K, Ohashi K, Miyake K, Shimizu T, Hamada N, Mukai Y, Hirayama S, Nihei T. Relevance of surface characteristics in the adhesiveness of polymicrobial biofilms to crown restoration materials. J Oral Sci 2018; 60:129-136. [DOI: 10.2334/josnusd.16-0758] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Ayako Teranaka
- Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo
| | - Kiyoshi Tomiyama
- Division of Cariology and Restorative Dentistry, Department of Oral Function and Restoration, Graduate School of Dentistry, Kanagawa Dental University
| | - Katsura Ohashi
- Division of Clinical Biomaterials, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Kaori Miyake
- Division of Clinical Biomaterials, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Tota Shimizu
- Division of Prosthodontic Dentistry for Function of TMJ and Occlusion, Department of Oral Function and Restoration, Kanagawa Dental University
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
| | - Yoshiharu Mukai
- Division of Cariology and Restorative Dentistry, Department of Oral Function and Restoration, Graduate School of Dentistry, Kanagawa Dental University
| | - Satoshi Hirayama
- Department of Operative Dentistry, Nihon University School of Dentistry at Matsudo
| | - Tomotaro Nihei
- Division of Clinical Biomaterials, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University
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Held KD, Hamada N. Correction to: Held and Hamada, Summary of the Bill Morgan Memorial Symposium - part 1: biology, epidemiology and radiation protection. Int J Radiat Biol 2017; 93:x. [PMID: 28766988 DOI: 10.1080/09553002.2017.1359999] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Yoshida A, Sasaki H, Toyama T, Araki M, Fujioka J, Tsukiyama K, Hamada N, Yoshino F. Antimicrobial effect of blue light using Porphyromonas gingivalis pigment. Sci Rep 2017; 7:5225. [PMID: 28701797 PMCID: PMC5507902 DOI: 10.1038/s41598-017-05706-1] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Accepted: 06/09/2017] [Indexed: 01/07/2023] Open
Abstract
The development of antibiotics cannot keep up with the speed of resistance acquired by microorganisms. Recently, the development of antimicrobial photodynamic therapy (aPDT) has been a necessary antimicrobial strategy against antibiotic resistance. Among the wide variety of bacteria found in the oral flora, Porphyromonas gingivalis (P. gingivalis) is one of the etiological agents of periodontal disease. aPDT has been studied for periodontal disease, but has risks of cytotoxicity to normal stained tissue. In this study, we performed aPDT using protoporphyrin IX (PpIX), an intracellular pigment of P. gingivalis, without an external photosensitizer. We confirmed singlet oxygen generation by PpIX in a blue-light irradiation intensity-dependent manner. We discovered that blue-light irradiation on P. gingivalis is potentially bactericidal. The sterilization mechanism seems to be oxidative DNA damage in bacterial cells. Although it is said that no resistant bacteria will emerge using aPDT, the conventional method relies on an added photosensitizer dye. PpIX in P. gingivalis is used in energy production, so aPDT applied to PpIX of P. gingivalis should limit the appearance of resistant bacteria. This approach not only has potential as an effective treatment for new periodontal diseases, but also offers potential antibacterial treatment for multiple drug resistant bacteria.
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Affiliation(s)
- Ayaka Yoshida
- Division of Photomedical Dentistry, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa, 238-8580, Japan
| | - Haruka Sasaki
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa, 238-8580, Japan
| | - Toshizo Toyama
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa, 238-8580, Japan
| | - Mitsunori Araki
- Department of Chemistry, Faculty of Science Division I, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan
| | - Jun Fujioka
- Department of Chemistry, Faculty of Science Division I, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan
| | - Koichi Tsukiyama
- Department of Chemistry, Faculty of Science Division I, Tokyo University of Science, 1-3 Kagurazaka, Shinjuku-ku, Tokyo, 162-8601, Japan
| | - Nobushiro Hamada
- Division of Microbiology, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa, 238-8580, Japan
| | - Fumihiko Yoshino
- Division of Photomedical Dentistry, Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa, 238-8580, Japan.
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Shimizu T, To M, Kamata Y, Saruta J, Sato T, Fuchida S, Hamada N, Tsukinoki K. Human β-defensin-2 and interleukin-1β expression in response to Porphyromonas gingivalis challenge in mice transplanted with periodontitic human gingiva. Microb Pathog 2017; 107:38-43. [PMID: 28286291 DOI: 10.1016/j.micpath.2017.03.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2016] [Revised: 03/02/2017] [Accepted: 03/06/2017] [Indexed: 10/20/2022]
Abstract
Inter-individual variability in the host response contributes significantly to expression of periodontal disease. Thus, research into the human host response is considered important in the analysis of periodontal disease. Human β-defensin-2 (hBD-2) is typically produced by epithelial tissues after stimulation with microorganisms and inflammatory mediators, and it contributes to the initial defense in the innate immune response. However, hBD-2 expression in response to infection has not been investigated in human gingival tissue with periodontitis. We examined the response to Porphyromonas gingivalis in an established in vivo model of human gingival grafts with various degrees of periodontitis. We also investigated the expression profile of interleukin-1β (IL-1β). Gingival tissues were collected from 40 patients with chronic periodontitis (21 with slight-to-moderate disease, 19 with severe disease) during tooth extraction or periodontal surgery. These tissues were transplanted subcutaneously into nu/nu mice. We used real-time PCR to compare the expression of hBD-2 and IL-1β. In slight-to-moderate chronic periodontitis, hBD-2 expression was significantly higher in the stimulated group than in the non-stimulated group (p < 0.05), but there was no significant increase in the group with severe chronic periodontitis. IL-1β expression did not differ between groups. Increased expression of hBD-2 and IL-1β was associated with slight-to-moderate periodontitis (p < 0.05), and there was a significant relationship between decreased hBD-2 and IL-1β expression and severe periodontitis (p < 0.05). The initial expression profile of hBD-2 in P. gingivalis infection differs according to the severity of periodontitis. In addition, changes in hBD-2 and IL-1β expression may be important in the progression of periodontitis.
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Affiliation(s)
- Tomoko Shimizu
- Department of Highly Advanced Stomatology, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan
| | - Masahiro To
- Department of Oral Science, Division of Environmental Pathology, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan
| | - Yohei Kamata
- Department of Highly Advanced Stomatology, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan
| | - Juri Saruta
- Department of Oral Science, Division of Environmental Pathology, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan
| | - Takenori Sato
- Department of Microbiology and Infection, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan
| | - Shinya Fuchida
- Department of Dental Sociology, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan
| | - Nobushiro Hamada
- Department of Microbiology and Infection, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan
| | - Keiichi Tsukinoki
- Department of Oral Science, Division of Environmental Pathology, Kanagawa Dental University, Graduate School of Dentistry, Kanagawa, Japan.
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Ogino H, Fujimichi Y, Sasaki M, Hamada N, Iwasaki T, Yoshida K, Hattori T. Quantitative assessment of provability of radiation-related cancers considering unavoidable existence of unadjusted risk factors. J Radiol Prot 2016; 36:865-884. [PMID: 27739409 DOI: 10.1088/0952-4746/36/4/865] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The attribution of stochastic effects to exposure to ionizing radiation has been qualitatively discussed by introducing two distinct concepts of provability and probability. This study aims to develop a method of quantitatively assessing the provability of radiation-related cancers. To this end, the 'minimum provable dose' (MPD) was developed and applied to actual cancer mortality in Japan. The background lifetime risk of cancer mortality was calculated for the esophagus, stomach, colon, liver, lungs, skin, breasts, ovaries, bladder, and bone marrow as well as the age-specific risk coefficients reproducing those given in the 2007 Recommendations of the International Commission on Radiological Protection (ICRP). Comparing the relative ratio of MPDs, which was defined herein as the 'provability index' (PI), we quantitatively ranked radiation-related cancers for different tissues and organs predicated on provability for ages of 10, 30, 50, and 0-85+ years at exposure. We discuss the radiological protection of male emergency workers focusing on cancers highly prioritized according to the ranking (i.e. colon, bone marrow, and bladder). The present study proposed the system to quantitatively evaluate the level of radiological protection taking into account the variations of the background cancer risk on the provability of radiation-related cancers.
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Affiliation(s)
- H Ogino
- Radiation Safety Research Center, Nuclear Technology Research Laboratory, Central Research Institute of Electric Power Industry, 2-11-1, Iwado Kita, Komae-shi, Tokyo 201-8511, Japan
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40
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Fukukura Y, Fujiyoshi F, Hamada H, Takao S, Aikou T, Hamada N, Yonezawa S, Nakajo M. Intraductal papillary mucinous tumors of the pancreas. Acta Radiol 2016; 44:464-71. [PMID: 14510751 DOI: 10.1080/j.1600-0455.2003.00111.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Purpose: To compare the effectiveness of thin-section helical CT and MR imaging with gadolinium-enhanced dynamic technique and MR cholangiopancreatography (MRCP) in the examination of patients with intraductal papillary mucinous tumors. Material and Methods: Helical CT, dynamic MR imaging, and MRCP of 25 intraductal papillary mucinous tumors were compared with ERCP and surgical findings. Results: The duodenal papilla was identified by helical CT and dynamic MR imaging in 11 (44%) and 20 (80%) of the 25 patients, respectively ( p<0.05). The main pancreatic duct was visualized on helical CT, dynamic MR imaging, and MRCP in all patients (100%): 25 (96.2%), 24 (92.3%), and 26 (100%) cystic lesions were depicted, respectively. A communicating duct between the main pancreatic duct and the cystic lesion was visualized on helical CT, dynamic MR imaging, and MRCP in 14 (53.8%), 11 (42.3%), and 15 (55.7%) lesions, respectively. The papillary projections corresponding to 3 mm or larger papillary neoplasms were depicted on helical CT and MR imaging in 7 patients (25%). Conclusion: MR imaging was equal or slightly superior to thin-section helical CT in the evaluation of intraductal papillary mucinous tumors.
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Affiliation(s)
- Y Fukukura
- Department of Radiology, Faculty of Medicine, Kagoshima University, 8-35-1 Sakuragaoka, Kagoshima City 890-8520, Japan.
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41
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Hamada N, Silva JO, Pedroza MK. A new species of Enderleina Jewett (Plecoptera, Perlidae) from Amazonas State, Brazil. Zootaxa 2016; 4098:392-400. [PMID: 27394593 DOI: 10.11646/zootaxa.4098.2.11] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2016] [Indexed: 11/04/2022]
Abstract
Enderleina Jewett, 1960 is one of the least-known Perlidae genera in northern South America, including six species. During an aquatic insect survey of the northern portion of Amazonas State, Brazil, we collected a male Enderleina with a distinct pronotum pattern and genitalic morphology. The objectives of this study are to describe a new species of Enderleina based on male morphology. The new species can be distinguished from all other Enderleina species in the male by the presence of a paired thin dark band on the mesal region of pronotum and by the structure of the penial armature.
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Affiliation(s)
- N Hamada
- Instituto Nacional de Pesquisas da Amazônia - INPA, Coordenação de Biodiversidade- CBio, 69067-375, Manaus, AM, Brazil.;
| | - J O Silva
- Instituto Nacional de Pesquisas da Amazônia - INPA, Coordenação de Biodiversidade- CBio, 69067-375, Manaus, AM, Brazil.;
| | - M K Pedroza
- Instituto Nacional de Pesquisas da Amazônia - INPA, Coordenação de Biodiversidade- CBio, 69067-375, Manaus, AM, Brazil.;
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Funaki S, Tokutomi F, Wada-Takahashi S, Yoshino F, Yoshida A, Maehata Y, Miyamoto C, Toyama T, Sato T, Hamada N, Lee MCI, Takahashi SS. Porphyromonas gingivalis infection modifies oral microcirculation and aortic vascular function in the stroke-prone spontaneously hypertensive rat (SHRSP). Microb Pathog 2016; 92:36-42. [DOI: 10.1016/j.micpath.2015.12.009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2015] [Revised: 12/15/2015] [Accepted: 12/22/2015] [Indexed: 02/03/2023]
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43
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Saita M, Kaneko J, Sato T, Takahashi SS, Wada-Takahashi S, Kawamata R, Sakurai T, Lee MCI, Hamada N, Kimoto K, Nagasaki Y. Novel antioxidative nanotherapeutics in a rat periodontitis model: Reactive oxygen species scavenging by redox injectable gel suppresses alveolar bone resorption. Biomaterials 2016; 76:292-301. [DOI: 10.1016/j.biomaterials.2015.10.077] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2015] [Revised: 10/26/2015] [Accepted: 10/29/2015] [Indexed: 01/12/2023]
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44
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Bhawal UK, Lee HJ, Arikawa K, Shimosaka M, Suzuki M, Toyama T, Sato T, Kawamata R, Taguchi C, Hamada N, Nasu I, Arakawa H, Shibutani K. Micromolar sodium fluoride mediates anti-osteoclastogenesis in Porphyromonas gingivalis-induced alveolar bone loss. Int J Oral Sci 2015; 7:242-9. [PMID: 26674426 PMCID: PMC5153593 DOI: 10.1038/ijos.2015.28] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 04/01/2015] [Indexed: 11/15/2022] Open
Abstract
Osteoclasts are bone-specific multinucleated cells generated by the differentiation of monocyte/macrophage lineage precursors. Regulation of osteoclast differentiation is considered an effective therapeutic approach to the treatment of bone-lytic diseases. Periodontitis is an inflammatory disease characterized by extensive bone resorption. In this study, we investigated the effects of sodium fluoride (NaF) on osteoclastogenesis induced by Porphyromonas gingivalis, an important colonizer of the oral cavity that has been implicated in periodontitis. NaF strongly inhibited the P. gingivalis-induced alveolar bone loss. That effect was accompanied by decreased levels of cathepsin K, interleukin (IL)-1β, matrix metalloproteinase 9 (MMP9), and tartrate-resistant acid phosphatase, which were up-regulated during P. gingivalis-induced osteoclastogenesis. Consistent with the in vivo anti-osteoclastogenic effect, NaF inhibited osteoclast formation caused by the differentiation factor RANKL (receptor activator of nuclear factor κB ligand) and macrophage colony-stimulating factor (M-CSF). The RANKL-stimulated induction of the transcription factor nuclear factor of activated T cells (NFAT) c1 was also abrogated by NaF. Taken together, our data demonstrate that NaF inhibits RANKL-induced osteoclastogenesis by reducing the induction of NFATc1, ultimately leading to the suppressed expression of cathepsin K and MMP9. The in vivo effect of NaF on the inhibition of P. gingivalis-induced osteoclastogenesis strengthens the potential usefulness of NaF for treating periodontal diseases.
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Affiliation(s)
- Ujjal K Bhawal
- Department of Biochemistry and Molecular Biology, Nihon University School of Dentistry at Matsudo, Matsudo, Japan.,Research Institute of Oral Health, Nihon University School of Dentistry at Matsudo, Matsudo, Japan.,Department of Oral Health, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Japan
| | - Hye-Jin Lee
- Department of Dental Hygiene, Howon University, Gunsan, Korea
| | - Kazumune Arikawa
- Research Institute of Oral Health, Nihon University School of Dentistry at Matsudo, Matsudo, Japan.,Department of Preventive and Public Oral Health, Nihon University School of Dentistry at Matsudo, Matsudo, Japan
| | - Michiharu Shimosaka
- Research Institute of Oral Health, Nihon University School of Dentistry at Matsudo, Matsudo, Japan.,Department of Anesthesiology, Nihon University School of Dentistry at Matsudo, Matsudo, Japan
| | - Masatoshi Suzuki
- Research Institute of Oral Health, Nihon University School of Dentistry at Matsudo, Matsudo, Japan.,Department of Anesthesiology, Nihon University School of Dentistry at Matsudo, Matsudo, Japan
| | - Toshizo Toyama
- Department of Infection Control, Division of Microbiology, Kanagawa Dental University, Yokosuka, Japan
| | - Takenori Sato
- Department of Infection Control, Division of Microbiology, Kanagawa Dental University, Yokosuka, Japan
| | - Ryota Kawamata
- Department of Radiopraxis Science, Kanagawa Dental University, Yokosuka, Japan
| | - Chieko Taguchi
- Research Institute of Oral Health, Nihon University School of Dentistry at Matsudo, Matsudo, Japan.,Department of Preventive and Public Oral Health, Nihon University School of Dentistry at Matsudo, Matsudo, Japan
| | - Nobushiro Hamada
- Department of Infection Control, Division of Microbiology, Kanagawa Dental University, Yokosuka, Japan
| | - Ikuo Nasu
- Research Institute of Oral Health, Nihon University School of Dentistry at Matsudo, Matsudo, Japan.,Department of Preventive and Public Oral Health, Nihon University School of Dentistry at Matsudo, Matsudo, Japan
| | - Hirohisa Arakawa
- Department of Oral Health, Graduate School of Dentistry, Kanagawa Dental University, Yokosuka, Japan
| | - Koh Shibutani
- Research Institute of Oral Health, Nihon University School of Dentistry at Matsudo, Matsudo, Japan.,Department of Preventive and Public Oral Health, Nihon University School of Dentistry at Matsudo, Matsudo, Japan
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Tanaka Y, Toyama T, Wada-Takahashi S, Sasaki H, Miyamoto C, Maehata Y, Yoshino F, Yoshida A, Takahashi SS, Watanabe K, Lee MCI, Todoki K, Hamada N. Protective effects of (6R)-5,6,7,8-tetrahydro-l-biopterin on local ischemia/reperfusion-induced suppression of reactive hyperemia in rat gingiva. J Clin Biochem Nutr 2015; 58:69-75. [PMID: 26798200 PMCID: PMC4706094 DOI: 10.3164/jcbn.15-69] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [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: 05/20/2015] [Accepted: 08/10/2015] [Indexed: 12/20/2022] Open
Abstract
We herein investigated the regulatory mechanism in the circulation responsible for rat gingival reactive hyperemia (RH) associated with ischemia/reperfusion (I/R). RH was analyzed using a laser Doppler flowmeter. RH and I/R were elicited by gingival compression and release with a laser Doppler probe. RH increased in a time-dependent manner when the duration of compression was between 30 s and 20 min. This increase was significantly suppressed by Nω-nitro-l-arginine-methyl-ester (l-NAME), 7-nitroindazole (7-NI), and 2,4-diamino-6-hydroxypyrimidine (DAHP). However, RH was markedly inhibited following 60 min of compression. This inhibition was significantly decreased by treatments with superoxide dismutase (SOD), (6R)-5,6,7,8-tetrahydro-l-biopterin (BH4), and sepiapterin. The luminescent intensity of superoxide anion (O2•−)-induced 2-methyl-6-(4-methoxyphenyl)-3,7-dihydroimidazo-[1,2-a] pyrazine-3-one (MCLA) was markedly decreased by SOD and BH4, but only slightly by sepiapterin. BH4 significantly decreased O2•− scavenging activity in a time-dependent manner. These results suggested that nitric oxide (NO) secreted by the nitrergic nerve played a role in regulating local circulation in rat gingiva. This NO-related regulation of local circulation was temporarily inhibited in the gingiva by the I/R treatment. The decrease observed in the production of NO, which was caused by suppression of NO synthase (NOS) activity subsequent to depletion of the NOS co-factor BH4 by O2•−, played a partial role in this inhibition.
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Affiliation(s)
- Yusaku Tanaka
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Toshizo Toyama
- Division of Microbiology, Department of Infection Control, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Satoko Wada-Takahashi
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Haruka Sasaki
- Division of Microbiology, Department of Infection Control, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Chihiro Miyamoto
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Yojiro Maehata
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Fumihiko Yoshino
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Ayaka Yoshida
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Shun-Suke Takahashi
- Department of Oral Science, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Kiyoko Watanabe
- Division of Microbiology, Department of Infection Control, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Masaichi-Chang-Il Lee
- Yokosuka-Shonan Disaster Health Emergency Research Center & ESR Laboratories, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Kazuo Todoki
- Department of Health Science, School of Nursing, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
| | - Nobushiro Hamada
- Division of Microbiology, Department of Infection Control, Graduate School of Dentistry, Kanagawa Dental University, 82 Inaoka-cho, Yokosuka, Kanagawa 238-8580, Japan
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Matsuo T, Sugita T, Shimose S, Hamada N, Deie M, Urata Y. 367P Detecting circulating tumor cells by hTERT-specific replication-selective adenovirus in postoperative sarcoma patients. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv530.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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47
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Ahmed Z, McHugh S, Elmallah A, Hamada N, Colgan M, O'Callaghan A, O'Neill S, Madhavan P, Martin Z. Emergency Tansfer to Specialist Thoracic Endovascular Centre: A Safe and Feasaible Option. Eur J Vasc Endovasc Surg 2015. [DOI: 10.1016/j.ejvs.2015.06.102] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Leonel BF, Koroiva R, Hamada N, Ferreira-Keppler RL, Roque FO. Potential Effects of Climate Change on Ecological Interaction Outcomes Between Two Disease-Vector Mosquitoes: A Mesocosm Experimental Study. J Med Entomol 2015; 52:866-872. [PMID: 26336208 DOI: 10.1093/jme/tjv068] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/13/2014] [Accepted: 05/24/2015] [Indexed: 06/05/2023]
Abstract
The objective of this study was to experimentally assess the effects of different climate change scenarios on the outcomes of interactions between Aedes aegypti (L.) and Culex quinquefasciatus (Say) (Diptera: Culicidae) larvae. The experimental design maintained a constant density of specimens while the proportion of the species in different experimental climate change scenarios varied. Our results indicate that survival of the two species was not affected, but larval development and pupation times decreased under elevated atmospheric CO(2) concentration and high air temperature. In climate change scenarios with both species together, the survival of Ae. aegypti increased and its larval development time decreased with increasing density of Cx. quinquefasciatus. This may be attributed to the effects of intraspecific competition being more significant than interspecific competition in Ae. aegypti. Our study also reveals that climatic changes may affect the patterns of interactions between Cx. quinquefasciatus and Ae. aegypti. Alterations in climatic conditions changed the response of context-dependent competition, indicating the importance of studies on how ecological interactions will be affected by projected future climatic change.
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Affiliation(s)
- B F Leonel
- Laboratório de Ecologia, CCBS, Universidade Federal de Mato Grosso do Sul - UFMS, Campo Grande, MS 79070-900, Brazil
| | - R Koroiva
- Programa de Pós-graduação em Ecologia e Conservação, CCBS, Universidade Federal de Mato Grosso do Sul - UFMS, Campo Grande, MS 79070-900, Brazil
| | - N Hamada
- Coordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia - INPA, Manaus, AM 69067-375, Brazil
| | - R L Ferreira-Keppler
- Coordenação de Biodiversidade, Instituto Nacional de Pesquisas da Amazônia - INPA, Manaus, AM 69067-375, Brazil
| | - F O Roque
- Laboratório de Ecologia, CCBS, Universidade Federal de Mato Grosso do Sul - UFMS, Campo Grande, MS 79070-900, Brazil.
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Roque FO, Escarpinati SC, Valente-Neto F, Hamada N. Responses of Aquatic Saproxylic Macroinvertebrates to Reduced-Impact Logging in Central Amazonia. Neotrop Entomol 2015; 44:345-350. [PMID: 26174960 DOI: 10.1007/s13744-015-0295-4] [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] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/22/2014] [Accepted: 03/28/2015] [Indexed: 06/04/2023]
Abstract
Reduced-impact logging (RIL) is an alternative land use because it reduces damage to forest cover in comparison with clear-cut practices. However, management practices adopted in RIL can affect wood availability and, consequently, fauna associated with dead wood during part of their life cycle (saproxylic). In this study, we evaluated whether aquatic saproxylic macroinvertebrates are affected by reduced-impact logging in Central Amazonia. We selected six streams in areas under reduced-impacted logging and six in primary forest areas and collected submerged woody debris. We did not find any differences in water pH, conductivity, and wood availability between reduced-impacted forest and primary forest streams. We found 248 saproxylic aquatic macroinvertebrates belonging to 37 taxa. We found five wood specialist (Dryops, Lutrochus, Stenochironomus, Oukuriella, and Endotribelos) and 32 generalists, totalling 98 and 150 individuals, respectively. In general, our results show that reduced-impact logging does not affect richness, abundance, and composition of saproxylic macroinvertebrates. The main explanation for this pattern is that management practices do not change important macroinvertebrate niche dimensions, including wood availability and the water's chemical and physical variables. Thus, controlled logging, such as applied in the area of the Central Amazonian streams studied, opens a new prospect for insect conservation and commercial exploitation of wood, which is not possible when clear-cut practices are adopted.
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Affiliation(s)
- F O Roque
- Centro de Ciências Biológicas e da Saúde, Univ Federal do Mato Grosso do Sul, Campo Grande, MS, 79804-970, Brasil
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Tokutomi F, Wada-Takahashi S, Sugiyama S, Toyama T, Sato T, Hamada N, Tsukinoki K, Takahashi SS, Lee MCI. Porphyromonas gingivalis-induced alveolar bone loss is accelerated in the stroke-prone spontaneously hypertensive rat. Arch Oral Biol 2015; 60:911-8. [DOI: 10.1016/j.archoralbio.2015.02.012] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Revised: 11/27/2014] [Accepted: 02/13/2015] [Indexed: 02/05/2023]
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