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Hayashi JI, Ono K, Iwamura Y, Sasaki Y, Ohno T, Goto R, Nishida E, Yamamoto G, Kikuchi T, Higuchi N, Mitani A, Fukuda M. Suppression of subgingival bacteria by antimicrobial photodynamic therapy using transgingival irradiation: A randomized clinical trial. J Periodontol 2023. [PMID: 37910482 DOI: 10.1002/jper.23-0328] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2023] [Revised: 10/01/2023] [Accepted: 10/06/2023] [Indexed: 11/03/2023]
Abstract
BACKGROUND Antimicrobial photodynamic therapy (aPDT) is an effective method for eradicating bacteria in periodontal therapy. Standard aPDT requires the insertion of a laser tip into a periodontal pocket, in which the direction of irradiation is limited. Therefore, we devised an aPDT method that uses a transgingival near-infrared wavelength and indocyanine green-encapsulated and chitosan-coated nanoparticles as a photosensitizer. METHODS Forty patients undergoing supportive periodontal therapy, who had a single root tooth with a pocket of 5 mm or deeper, were used as subjects. In the test group, aPDT was performed by laser irradiation from outside the gingiva using photosensitizer nanoparticles. In the control group, pseudo aPDT without photosensitizer was performed by transgingival irradiation. Subgingival plaque was sampled from inside the pocket before, immediately after, and 1 week after treatment, and evaluated by colony counting and real-time polymerase chain reaction. RESULTS There were no significant differences in age, sex, periodontal pocket depth, and bleeding on probing between the test and control groups. Compared with the colony count before treatment, the count in the test group was significantly reduced immediately after treatment. The number of patients with colony reduction to ≤50% and ≤10% was significantly higher in the test group than in the control group. None of the participants reported pain, although one participant reported discomfort. CONCLUSION As a bacterial control method for residual pockets in patients undergoing supportive periodontal therapy, transgingival aPDT is a promising treatment strategy that is not generally accompanied by pain or discomfort.
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Affiliation(s)
- Jun-Ichiro Hayashi
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
| | - Kohta Ono
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
| | - Yuki Iwamura
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
| | - Yasuyuki Sasaki
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
| | - Tasuku Ohno
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
| | - Ryoma Goto
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
| | - Eisaku Nishida
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
| | - Genta Yamamoto
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
| | - Takeshi Kikuchi
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
| | - Naoya Higuchi
- Department of Endodontics, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
| | - Akio Mitani
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
| | - Mitsuo Fukuda
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
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Kato A, Naitoh M, Inagaki K, Yamamoto G, Ariji E, Mitani A, Honda M. Multiple assessment of molars with hypercementosis lost due to periodontitis using X-ray micro-computed tomography, electron microprobe analysis, and histological sections. J Oral Biosci 2022; 64:259-262. [PMID: 35150874 DOI: 10.1016/j.job.2022.02.003] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2021] [Revised: 02/02/2022] [Accepted: 02/04/2022] [Indexed: 11/16/2022]
Abstract
This article aimed to achieve a better understanding of cementum hyperplasia in the maxillary second molars lost due to periodontitis. Six maxillary second molars with hypercementosis were measured for the mineral concentration using micro-computed tomography and calcium element distributions using electron microprobe analysis. Calcium was distributed throughout the cementum, although the mineral concentration differed based on the cementum depth. The hyperplastic cementum was of the extrinsic fiber-rich cellular mixed stratified type. These results have implications for future studies aiming to diagnose hypercementosis. Further studies are needed to investigate the composition of the cementum matrix.
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Affiliation(s)
- Akiko Kato
- Department of Oral Anatomy, School of Dentistry, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya, Aichi 464-8650, Japan.
| | - Munetaka Naitoh
- Department of Oral Maxillofacial Radiology, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi 464-8651, Japan
| | - Koji Inagaki
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi 464-8651, Japan; Department of Dental Hygiene, Aichi Gakuin University Junior College, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya, Aichi 464-8650, Japan
| | - Genta Yamamoto
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi 464-8651, Japan
| | - Eiichiro Ariji
- Department of Oral Maxillofacial Radiology, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi 464-8651, Japan
| | - Akio Mitani
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, 2-11 Suemori-dori, Chikusa-ku, Nagoya, Aichi 464-8651, Japan
| | - Masaki Honda
- Department of Oral Anatomy, School of Dentistry, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya, Aichi 464-8650, Japan
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Higuchi N, Hayashi JI, Fujita M, Iwamura Y, Sasaki Y, Goto R, Ohno T, Nishida E, Yamamoto G, Kikuchi T, Mitani A, Fukuda M. Photodynamic Inactivation of an Endodontic Bacteria Using Diode Laser and Indocyanine Green-Loaded Nanosphere. Int J Mol Sci 2021; 22:ijms22168384. [PMID: 34445089 PMCID: PMC8395049 DOI: 10.3390/ijms22168384] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 07/22/2021] [Accepted: 07/30/2021] [Indexed: 11/30/2022] Open
Abstract
Apical periodontitis, an inflammatory lesion causing bone resorption around the apex of teeth, is treated by eradicating infectious bacteria from the root canal. However, it has a high recurrence rate and often requires retreatment. We investigated the bactericidal effect of antimicrobial photodynamic therapy (aPDT)/photodynamic antimicrobial chemotherapy (PACT) using indocyanine green (ICG)-loaded nanospheres coated with chitosan and a diode laser on a biofilm of Enterococcus faecalis, a pathogen of refractory apical periodontitis. Biofilm of E. faecalis was cultured in a porcine infected root canal model. ICG solution was injected into the root canal, which was then irradiated with a laser (810 nm wavelength) from outside the root canal. The bactericidal effect was evaluated by colony counts and scanning electron microscopy. The result of the colony counts showed a maximum 1.89 log reduction after irradiation at 2.1 W for 5 min. The temperature rise during aPDT/PACT was confirmed to be within a safe range. Furthermore, the light energy transmittance through the root was at a peak approximately 1 min after the start of irradiation, indicating that most of the ICG in the root canal was consumed. This study shows that aPDT/PACT can suppress E. faecalis in infected root canals with high efficiency.
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Affiliation(s)
- Naoya Higuchi
- Department of Endodontics, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Aichi, Japan; (N.H.); (M.F.)
| | - Jun-ichiro Hayashi
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Aichi, Japan; (Y.I.); (Y.S.); (R.G.); (T.O.); (E.N.); (G.Y.); (T.K.); (A.M.); (M.F.)
- Correspondence:
| | - Masanori Fujita
- Department of Endodontics, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Aichi, Japan; (N.H.); (M.F.)
| | - Yuki Iwamura
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Aichi, Japan; (Y.I.); (Y.S.); (R.G.); (T.O.); (E.N.); (G.Y.); (T.K.); (A.M.); (M.F.)
| | - Yasuyuki Sasaki
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Aichi, Japan; (Y.I.); (Y.S.); (R.G.); (T.O.); (E.N.); (G.Y.); (T.K.); (A.M.); (M.F.)
| | - Ryoma Goto
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Aichi, Japan; (Y.I.); (Y.S.); (R.G.); (T.O.); (E.N.); (G.Y.); (T.K.); (A.M.); (M.F.)
| | - Tasuku Ohno
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Aichi, Japan; (Y.I.); (Y.S.); (R.G.); (T.O.); (E.N.); (G.Y.); (T.K.); (A.M.); (M.F.)
| | - Eisaku Nishida
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Aichi, Japan; (Y.I.); (Y.S.); (R.G.); (T.O.); (E.N.); (G.Y.); (T.K.); (A.M.); (M.F.)
| | - Genta Yamamoto
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Aichi, Japan; (Y.I.); (Y.S.); (R.G.); (T.O.); (E.N.); (G.Y.); (T.K.); (A.M.); (M.F.)
| | - Takeshi Kikuchi
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Aichi, Japan; (Y.I.); (Y.S.); (R.G.); (T.O.); (E.N.); (G.Y.); (T.K.); (A.M.); (M.F.)
| | - Akio Mitani
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Aichi, Japan; (Y.I.); (Y.S.); (R.G.); (T.O.); (E.N.); (G.Y.); (T.K.); (A.M.); (M.F.)
| | - Mitsuo Fukuda
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya 464-8651, Aichi, Japan; (Y.I.); (Y.S.); (R.G.); (T.O.); (E.N.); (G.Y.); (T.K.); (A.M.); (M.F.)
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Kato Y, Watanabe Y, Yamane Y, Mizutani H, Kurimoto F, Yamamoto G, Akagi K, Sakai H. P85.03 PD-L1 Expression and Efficacy of Immunotherapy in Japanese Patients with NSCLC Harboring MET Exon 14 Skipping Mutation. J Thorac Oncol 2021. [DOI: 10.1016/j.jtho.2021.01.1225] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Kato A, Hishikawa T, Inagaki K, Yamamoto G, Mitani A, Honda M. Evaluation of root morphology of maxillary and mandibular second molars lost due to periodontitis. J Periodontal Res 2020; 55:753-761. [PMID: 32449986 DOI: 10.1111/jre.12764] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2020] [Revised: 04/13/2020] [Accepted: 04/24/2020] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND OBJECTIVE Little is known about the anatomical characteristics of root morphology in molars lost due to periodontal reason. The aim of this study was to study root morphology in maxillary and mandibular molars lost due to periodontitis by investigating the frequency of root fusion, classifying fusion types, and measuring radicular groove depth by micro-computed tomography. MATERIAL AND METHODS Ninety-eight posterior teeth were collected from 87 Japanese patients during the study period. Of these, maxillary (N = 36) and mandibular (N = 22) second molars lost most frequently were assessed for root fusion and morphology. RESULTS The 36 maxillary second molars included nine (25%) teeth with a single root, 14 (39%) with two roots, and 13 (36%) with three roots. Of the 23 maxillary second molars with fused (1 and 2) roots, there were 11 (48%), 2 (9%), 1 (4%), 1 (4%), 3 (13%), and 5 (22%) teeth with root types 1-6, respectively. The 22 mandibular second molars comprised 14 (64%) teeth with a single root, 7 (32%) with two roots, and one (4%) with three roots. Of the 14 mandibular second molars with a fused (1) root, 12 (86%) had a C-shaped root and two (14%) had a non-C-shaped root. CONCLUSION We observed a higher frequency of root fusion in the present study compared with that reported by previous studies using randomly selected second molars.
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Affiliation(s)
- Akiko Kato
- Department of Oral Anatomy, School of Dentistry, Aichi Gakuin University, Nagoya, Japan
| | - Toshimitsu Hishikawa
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Japan
| | - Koji Inagaki
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Japan.,Department of Dental Hygiene, Aichi Gakuin University Junior College, Nagoya, Japan
| | - Genta Yamamoto
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Japan
| | - Akio Mitani
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Japan
| | - Masaki Honda
- Department of Oral Anatomy, School of Dentistry, Aichi Gakuin University, Nagoya, Japan
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Goto H, Ishihara Y, Kikuchi T, Izawa A, Ozeki N, Okabe E, Kamiya Y, Ozawa Y, Mizutani H, Yamamoto G, Mogi M, Nakata K, Maeda H, Noguchi T, Mitani A. Correction: Interleukin-1 Receptor Antagonist Has a Novel Function in the Regulation of Matrix Metalloproteinase-13 Expression. PLoS One 2020; 15:e0231910. [PMID: 32275705 PMCID: PMC7147734 DOI: 10.1371/journal.pone.0231910] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
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Yuasa M, Shiiba M, Kaji D, Kageyama K, Nishida A, Takagi S, Yamamoto H, Asano-Mori Y, Uchida N, Ishihara M, Izutsu K, Taniguchi S, Yamamoto G. CLINICAL SIGNIFICANCE OF UPTAKE VALUE ON F18-FDG PET/CT AND HISTOLOGICAL GRADE IN 164 PATIENTS WITH FOLLICULAR LYMPHOMA INCLUDING TRANSFORMATION - A SINGLE CENTER RETROSPECTIVE STUDY. Hematol Oncol 2019. [DOI: 10.1002/hon.63_2631] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- M. Yuasa
- Hematology; Toramono Hospital; Tokyo Japan
| | - M. Shiiba
- Dignostic Imaging Center; Toramono Hospital; Tokyo Japan
| | - D. Kaji
- Hematology; Toramono Hospital; Tokyo Japan
| | | | - A. Nishida
- Hematology; Toramono Hospital; Tokyo Japan
| | - S. Takagi
- Hematology; Toramono Hospital; Tokyo Japan
| | | | | | - N. Uchida
- Hematology; Toramono Hospital; Tokyo Japan
| | - M. Ishihara
- Dignostic Imaging Center; Toramono Hospital; Tokyo Japan
| | - K. Izutsu
- Hematology; National Cancer Center Hospital; Tokyo Japan
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Uruga H, Fujii T, Yamamoto G, Moriguchi S, Takahashi Y, Ogawa K, Murase R, Mochizuki S, Hanada S, Takaya H, Miyamoto A, Morokawa N, Kishi K. P3.02-033 Pathological and Molecular Alterations after First and Second Generation EGFR-TKI Therapy in Patients with EGFR-Mutated Lung Adenocarcinomas. J Thorac Oncol 2017. [DOI: 10.1016/j.jtho.2017.09.1563] [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: 10/18/2022]
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Gurgel-Giannetti J, Lynch D, Paiva A, Yamamoto G, Lucato L, Amorim S, Freua F, Giannetti A, Ripa B, Monti F, Ribeiro M, Van der Knaap M, Oldfors A, Vainzof M, Holden H, Kok F. Biallelic mutation in FDXIL leads to a complex phenotype: optic atrophy, reversible leukoencephalopathy, metabolic myopathy and axonal polyneuropathy. Neuromuscul Disord 2017. [DOI: 10.1016/j.nmd.2017.06.408] [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: 11/30/2022]
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Ohno T, Yamamoto G, Hayashi JI, Nishida E, Goto H, Sasaki Y, Kikuchi T, Fukuda M, Hasegawa Y, Mogi M, Mitani A. Angiopoietin-like protein 2 regulates Porphyromonas gingivalis lipopolysaccharide-induced inflammatory response in human gingival epithelial cells. PLoS One 2017; 12:e0184825. [PMID: 28934245 PMCID: PMC5608282 DOI: 10.1371/journal.pone.0184825] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 08/31/2017] [Indexed: 11/27/2022] Open
Abstract
Angiopoietin-like protein 2 (ANGPTL2) maintains tissue homeostasis by inducing inflammation and angiogenesis. It is produced in infiltrating immune cells or resident cells, such as adipocytes, vascular endothelial cells, and tumor cells. We hypothesized that ANGPTL2 might play an important role as a unique mediator in both systemic and periodontal disease. We demonstrated an increased ANGPTL2 concentration in gingival crevicular fluid from chronic periodontitis patients. Porphyromonas gingivalis lipopolysaccharide (LPS) treatment strongly induced ANGPTL2 mRNA and protein levels in Ca9-22 human gingival epithelial cells. Recombinant human ANGPTL2 increased interleukin 1β (IL-1β), IL-8, and tumor necrosis factor-α (TNF-α) mRNA and protein levels in Ca9-22 cells. Small-interfering (si)RNA-mediated ANGPTL2 knockdown in Ca9-22 cells reduced IL-1β, IL-8 and TNF-α mRNA and protein levels compared with control siRNA (p<0.01) in P. gingivalis LPS-stimulated Ca9-22 cells. Antibodies against integrin α5β1, an ANGPTL receptor, blocked induction of these inflammatory cytokines in P. gingivalis LPS-treated Ca9-22 cells, suggesting that secreted ANGPTL induces inflammatory cytokines in gingival epithelial cells via an autocrine loop. The classic sequential cascade of P. gingivalis LPS → inflammatory cytokine induction is well established. However, in the current study, we reveal a novel cascade comprising sequential P. gingivalis LPS → ANGPTL2 → integrin α5β1 → inflammatory cytokine induction, which might be responsible for inducing potent periodontal disorganization activity in gingival epithelial cells. Via this pathway, ANGPTL2 functions in the pathogenesis of periodontitis and contributes to prolonging chronic inflammation in patients with systemic disease.
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Affiliation(s)
- Tasuku Ohno
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Genta Yamamoto
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
- * E-mail:
| | - Jun-ichiro Hayashi
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Eisaku Nishida
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Hisashi Goto
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Yasuyuki Sasaki
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Takeshi Kikuchi
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Mitsuo Fukuda
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Yoshiaki Hasegawa
- Department of Microbiology, School of Dentistry, Aichi Gakuin University, Nagoya, Chikusa-ku, Aichi, Japan
| | - Makio Mogi
- Department of Integrative Education of Pharmacy, School of Pharmacy, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Akio Mitani
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
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Sasaki Y, Hayashi JI, Fujimura T, Iwamura Y, Yamamoto G, Nishida E, Ohno T, Okada K, Yamamoto H, Kikuchi T, Mitani A, Fukuda M. New Irradiation Method with Indocyanine Green-Loaded Nanospheres for Inactivating Periodontal Pathogens. Int J Mol Sci 2017; 18:ijms18010154. [PMID: 28098777 PMCID: PMC5297787 DOI: 10.3390/ijms18010154] [Citation(s) in RCA: 30] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2016] [Revised: 12/30/2016] [Accepted: 01/10/2017] [Indexed: 11/16/2022] Open
Abstract
Antimicrobial photodynamic therapy (aPDT) has been proposed as an adjunctive strategy for periodontitis treatments. However, use of aPDT for periodontal treatment is complicated by the difficulty in accessing morphologically complex lesions such as furcation involvement, which the irradiation beam (which is targeted parallel to the tooth axis into the periodontal pocket) cannot access directly. The aim of this study was to validate a modified aPDT method that photosensitizes indocyanine green-loaded nanospheres through the gingivae from outside the pocket using a diode laser. To establish this trans-gingival irradiation method, we built an in vitro aPDT model using a substitution for gingivae. Irradiation conditions and the cooling method were optimized before the bactericidal effects on Porphyromonas gingivalis were investigated. The permeable energy through the gingival model at irradiation conditions of 2 W output power in a 50% duty cycle was comparable with the transmitted energy of conventional irradiation. Intermittent irradiation with air cooling limited the temperature increase in the gingival model to 2.75 °C. The aPDT group showed significant bactericidal effects, with reductions in colony-forming units of 99.99% after 5 min of irradiation. This effect of aPDT against a periodontal pathogen demonstrates the validity of trans-gingival irradiation for periodontal treatment.
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Affiliation(s)
- Yasuyuki Sasaki
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
- Division of Periodontal Health Promotion, Dental Hospital, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
| | - Jun-Ichiro Hayashi
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
| | - Takeki Fujimura
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
- Division of Periodontal Health Promotion, Dental Hospital, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
| | - Yuki Iwamura
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
- Division of Periodontal Health Promotion, Dental Hospital, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
| | - Genta Yamamoto
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
| | - Eisaku Nishida
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
| | - Tasuku Ohno
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
| | - Kosuke Okada
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
| | - Hiromitsu Yamamoto
- Department of Pharmaceutical Engineering, School of Pharmacology, Aichi Gakuin University, Nagoya, Aichi 464-8650, Japan.
| | - Takeshi Kikuchi
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
| | - Akio Mitani
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
| | - Mitsuo Fukuda
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
- Division of Periodontal Health Promotion, Dental Hospital, Aichi Gakuin University, Nagoya, Aichi 464-8651, Japan.
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Abstract
The periodontal ligament (PDL) works as a suspensory ligament when external mechanical stress is placed on the teeth. PDL fibroblasts, the principal cells in the PDL, are responsible for many PDL functions. We hypothesized that mechanosensitive ion channels are present in human PDL fibroblasts, which are capable of responding to mechanical stress during normal function of the tissue. Using patch-clamp techniques, we detected mechanosensitive TREK-1 K+ channels (a member of the two-pore-domain K+ channel family), whose single-channel conductance was 104 pS in symmetrical K+-rich solutions. The open probability of the channel was low in the quiescent state, but it was strongly increased by the induction of membrane stretch. Arachidonic acid also enhanced the channel activity. RT-PCR and immunocytochemical observations showed the expression of TREK-1 K+ channels in PDL fibroblasts. The results suggest that the activation of TREK-1 K+ channels by masticatory stress contributes to the hyperpolarization of PDL fibroblasts.
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Affiliation(s)
- A Ohara
- Department of Bioscience, Shiga University of Medical Science, Seta, Ohtsu, Shiga 520-2192, Japan.
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Gurgel-Giannetti J, Yamamoto G, Lazar M, Machado M, Tavares W, Pavanello R, Oliveira A, Zatz M, Vainzof M. Nemaline myopathy: Clinical, pathological, muscle imaging and molecular characterization in a cohort of Brazilian patients. Neuromuscul Disord 2016. [DOI: 10.1016/j.nmd.2016.06.170] [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: 10/21/2022]
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14
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Goto H, Ishihara Y, Kikuchi T, Izawa A, Ozeki N, Okabe E, Kamiya Y, Ozawa Y, Mizutani H, Yamamoto G, Mogi M, Nakata K, Maeda H, Noguchi T, Mitani A. Interleukin-1 Receptor Antagonist Has a Novel Function in the Regulation of Matrix Metalloproteinase-13 Expression. PLoS One 2015; 10:e0140942. [PMID: 26474296 PMCID: PMC4608771 DOI: 10.1371/journal.pone.0140942] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2015] [Accepted: 09/30/2015] [Indexed: 11/18/2022] Open
Abstract
Interleukin-1 receptor antagonist (IL-1Ra) is an IL-1 family member, which binds to IL-1 receptors but does not induce any intracellular signaling. We addressed whether IL-1Ra has a novel function in regulation of the extracellular matrix or adhesion molecules. Polymerase chain reaction array analysis demonstrated a ~5-fold increase in matrix metalloproteinase 13 (MMP-13) mRNA expression of IL-1Ra siRNA-transfected Ca9-22 human oral squamous epithelial carcinoma cells compared with the control. In fact, MMP-13 mRNA and protein expression as well as its activity in IL-1Ra siRNA-transfected Ca9-22 cell lines were significantly higher than those in the control. IL-1Ra siRNA treatment resulted in strong elevation of MMP-13 expression, whereas addition of rhIL-1Ra (40 ng/ml) suppressed MMP-13 expression, suggesting that IL-1Ra had a specific effect on MMP-13 induction. IL-1Ra siRNA could potently suppress IL-1α. No significant difference was found between the MMP-13 mRNA expression of IL-1Ra siRNA-transfected cells and those treated with anti-IL-1α or anti-IL-1β antibodies. These results suggested that continuous supply of IL-1 had no effect on the induction of MMP-13 by IL-1Ra siRNA. Histopathological investigation of MMP-13 in periodontal tissue showed specific localization in the junctional epithelial cells of IL-1Ra knockout (KO) mice. Furthermore, infection with Aggregatibacter actinomycetemcomitans to establish an experimental periodontitis model resulted in predominant localization of MMP-13 along apical junctional epithelial cells. Laminin-5, which is degraded by MMP-13, was found in the internal basal lamina of wild-type mice, whereas the internal basal lamina of IL-1Ra KO mice did not show obvious laminin-5 localization. In particular, laminin-5 localization almost disappeared in the internal basal lamina of IL-1Ra KO mice infected with A. actinomycetemcomitans, suggesting that the suppression of IL-1Ra resulted in strong induction of MMP-13 that degraded laminin-5. In conclusion, IL-1Ra is associated with MMP-13 expression and has a novel function in such regulation without interference of the IL-1 signaling cascade.
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Affiliation(s)
- Hisashi Goto
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Yuichi Ishihara
- Department of Operative Dentistry, Endodontology, and Periodontology, School of Dentistry, Matsumoto Dental University, Nagano, Japan
| | - Takeshi Kikuchi
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Ario Izawa
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Nobuaki Ozeki
- Department of Endodontics, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Eijiro Okabe
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Yosuke Kamiya
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Yusuke Ozawa
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Hiroki Mizutani
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Genta Yamamoto
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Makio Mogi
- Department of Medicinal Biochemistry, School of Pharmacy, Aichi Gakuin University, Chikusa-ku, Nagoya, Japan
| | - Kazuhiko Nakata
- Department of Endodontics, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Hatsuhiko Maeda
- Department of Pathology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Japan
| | - Toshihide Noguchi
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
| | - Akio Mitani
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Chikusa-ku, Nagoya, Aichi, Japan
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Usui M, Sato T, Yamamoto G, Okamatsu Y, Hanatani T, Moritani Y, Sano K, Yamamoto M, Nakashima K. Gingival epithelial cells support osteoclastogenesis by producing receptor activator of nuclear factor kappa B ligand via protein kinase A signaling. J Periodontal Res 2015; 51:462-70. [PMID: 26432443 DOI: 10.1111/jre.12323] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/11/2015] [Indexed: 11/27/2022]
Abstract
BACKGROUND AND OBJECTIVE Periodontal disease is dental plaque-induced inflammatory disease of the periodontal tissues that results in bone loss in the affected teeth. During bone resorption, receptor activator of nuclear factor kappa B ligand (RANKL) is an essential factor that regulates osteoclastogenesis. Recently, we found that gingival epithelial cells (GECs) in periodontal tissue produce RANKL, the expression of which is regulated by tumor necrosis factor-α and protein kinase A signaling. In this study, we asked whether RANKL-producing GECs induce bone marrow macrophages (BMMs) to form osteoclasts in a co-culture system. MATERIAL AND METHODS Ca9-22 GECs and osteoclast precursor BMMs were co-cultured with or without the protein kinase A signaling activator forskolin or inhibitor H89 to examine whether the RANKL-producing GECs could be induced to form osteoclasts, as determined using a pit formation assay. RESULTS Osteoclasts formed spontaneously in co-cultures of Ca9-22 cells and BMMs, even in the absence of RANKL. The cells were cultured on bone slices for 14 d, at which time resorption pits were observed. Forskolin treatment significantly increased osteoclast numbers in these co-cultures, but forskolin alone did not induce osteoclast formation by BMMs. CONCLUSION GECs producing RANKL are able to support osteoclastogenesis in an in vitro co-culture system using GECs and BMMs, in a process promoted by forskolin.
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Affiliation(s)
- M Usui
- Department of Cardiology and Periodontology, Division of Periodontology, Kyushu Dental University, Kitakyushu City, Fukuoka, Japan.,Department of Periodontology, Showa University School of Dentistry, Ohta-ku, Tokyo, Japan
| | - T Sato
- Department of Oral and Maxillofacial Surgery, Saitama Medical University, Iruma-gun, Saitama, Japan
| | - G Yamamoto
- Department of Oral Pathology and Diagnosis, Showa University School of Dentistry, Shinagawa-ku, Tokyo, Japan
| | - Y Okamatsu
- Dental Clinic, Showa University Medical Hospital, Shinagawa-ku, Tokyo, Japan
| | - T Hanatani
- Department of Cardiology and Periodontology, Division of Periodontology, Kyushu Dental University, Kitakyushu City, Fukuoka, Japan
| | - Y Moritani
- Department of Cardiology and Periodontology, Division of Periodontology, Kyushu Dental University, Kitakyushu City, Fukuoka, Japan
| | - K Sano
- Department of Cardiology and Periodontology, Division of Periodontology, Kyushu Dental University, Kitakyushu City, Fukuoka, Japan
| | - M Yamamoto
- Department of Periodontology, Showa University School of Dentistry, Ohta-ku, Tokyo, Japan
| | - K Nakashima
- Department of Cardiology and Periodontology, Division of Periodontology, Kyushu Dental University, Kitakyushu City, Fukuoka, Japan
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Koshinuma S, Inoue Y, Yamada S, Takamori S, Shibutani A, Adachi T, Murakami T, Higo T, Yokoe Y, Yamamoto G. A case of obstructive sleep apnea syndrome caused by a huge epidermoid cyst. Int J Oral Maxillofac Surg 2015. [DOI: 10.1016/j.ijom.2015.08.646] [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: 11/17/2022]
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17
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Koshinuma S, Yamamoto A, Kagawa T, Kosasa Y, Shibutani A, Murakami T, Kurimoto N, Higo T, Yamada N, Yamamoto G. Treatment of bilateral, residual temporomandibular joint dislocation in a schizophrenic patient. Int J Oral Maxillofac Surg 2015. [DOI: 10.1016/j.ijom.2015.08.200] [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: 11/24/2022]
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18
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Ichikawa Y, Watahiki J, Nampo T, Nose K, Yamamoto G, Irie T, Mishima K, Maki K. Differences in the developmental origins of the periosteum may influence bone healing. J Periodontal Res 2014; 50:468-78. [PMID: 25225160 DOI: 10.1111/jre.12229] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/20/2014] [Indexed: 12/21/2022]
Abstract
BACKGROUND AND OBJECTIVE The jaw bone, unlike most other bones, is derived from neural crest stem cells, so we hypothesized that it may have different characteristics to bones from other parts of the body, especially in the nature of its periosteum. The periosteum exhibits osteogenic potential and has received considerable attention as a grafting material for the repair of bone and joint defects. MATERIAL AND METHODS Gene expression profiles of jaw bone and periosteum were evaluated by DNA microarray and real-time polymerase chain reaction. Furthermore, we perforated an area 2 mm in diameter on mouse frontal and parietal bones. Bone regeneration of these calvarial defects was evaluated using microcomputed tomography and histological analysis. RESULTS The DNA microarray data revealed close homology between the gene expression profiles within the ilium and femur. The gene expression of Wnt-1, SOX10, nestin, and musashi-1 were significantly higher in the jaw bone than in other locations. Microcomputed tomography and histological analysis revealed that the jaw bone had superior bone regenerative abilities than other bones. CONCLUSION Jaw bone periosteum exhibits a unique gene expression profile that is associated with neural crest cells and has a positive influence on bone regeneration when used as a graft material to repair bone defects. A full investigation of the biological and mechanical properties of jaw bone as an alternative graft material for jaw reconstructive surgery is recommended.
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Affiliation(s)
- Y Ichikawa
- Department of Orthodontics, Showa University School of Dentistry, Ohta-ku, Tokyo, Japan
| | - J Watahiki
- Department of Orthodontics, Showa University School of Dentistry, Ohta-ku, Tokyo, Japan
| | - T Nampo
- Department of Orthodontics, Showa University School of Dentistry, Ohta-ku, Tokyo, Japan
| | - K Nose
- Department of Orthodontics, Showa University School of Dentistry, Ohta-ku, Tokyo, Japan
| | - G Yamamoto
- Department of Oral Pathology and Diagnosis, Showa University School of Dentistry, Shinagawa-ku, Tokyo, Japan
| | - T Irie
- Department of Oral Pathology and Diagnosis, Showa University School of Dentistry, Shinagawa-ku, Tokyo, Japan
| | - K Mishima
- Department of Oral Pathology and Diagnosis, Showa University School of Dentistry, Shinagawa-ku, Tokyo, Japan
| | - K Maki
- Department of Orthodontics, Showa University School of Dentistry, Ohta-ku, Tokyo, Japan
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Yamamoto G, Taura K, Koyama Y, Tanabe K, Nishio T, Hatano E, Uemoto S. Pancreatic Stellate Cells Do Not Have Vitamin A In Fat Droplets. J Surg Res 2014. [DOI: 10.1016/j.jss.2013.11.874] [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: 11/30/2022]
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20
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Tanabe K, Taura K, Koyama Y, Yamamoto G, Nishio T, Hatano E, Uemoto S. Migration of Splenic Lymphocytes Promotes Fibrotic Response in the Liver through Modification of T Helper Cytokine Balance. J Surg Res 2014. [DOI: 10.1016/j.jss.2013.11.448] [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: 11/30/2022]
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21
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Taura K, Koyama Y, Tanabe K, Yamamoto G, Nishio T, Hatano E, Uemoto S. Liver Stiffness Measurement Predicts Posthepatectomy Liver Failure. J Surg Res 2014. [DOI: 10.1016/j.jss.2013.11.587] [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: 11/28/2022]
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22
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Fujihara R, Usui M, Yamamoto G, Nishii K, Tsukamoto Y, Okamatsu Y, Sato T, Asou Y, Nakashima K, Yamamoto M. Tumor necrosis factor-α enhances RANKL expression in gingival epithelial cells via protein kinase A signaling. J Periodontal Res 2013; 49:508-17. [DOI: 10.1111/jre.12131] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/02/2013] [Indexed: 01/11/2023]
Affiliation(s)
- R. Fujihara
- Department of Periodontology; Showa University School of Dentistry; Tokyo Japan
| | - M. Usui
- Department of Periodontology; Showa University School of Dentistry; Tokyo Japan
- Division of Periodontology; Departmetnt of Cariology and Periodontology; Kyushu Dental University; Kitakyushu City Fukuoka Japan
| | - G. Yamamoto
- Department of Oral Pathology and Diagnosis; Showa University School of Dentistry; Tokyo Japan
| | - K. Nishii
- Department of Periodontology; Showa University School of Dentistry; Tokyo Japan
- Department of Oral Pathology and Diagnosis; Showa University School of Dentistry; Tokyo Japan
| | - Y. Tsukamoto
- Department of Periodontology; Showa University School of Dentistry; Tokyo Japan
| | - Y. Okamatsu
- Dental Clinic; Showa University Medical Hospital; Tokyo Japan
| | - T. Sato
- Department of Oral and Maxillofacial Surgery; Saitama Medical University; Saitama Japan
| | - Y. Asou
- Department of Orthopaedic Surgery; Tokyo Medical and Dental University; Tokyo Japan
| | - K. Nakashima
- Division of Periodontology; Departmetnt of Cariology and Periodontology; Kyushu Dental University; Kitakyushu City Fukuoka Japan
| | - M. Yamamoto
- Department of Periodontology; Showa University School of Dentistry; Tokyo Japan
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23
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Suga T, Mitani A, Mogi M, Kikuchi T, Fujimura T, Takeda H, Hishikawa T, Yamamoto G, Hayashi JI, Ishihara Y, Noguchi T. Aggregatibacter actinomycetemcomitans lipopolysaccharide stimulated epithelial cells produce interleukin-15 that regulates T cell activation. Arch Oral Biol 2013; 58:1541-8. [PMID: 23890451 DOI: 10.1016/j.archoralbio.2013.06.020] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2013] [Revised: 06/19/2013] [Accepted: 06/29/2013] [Indexed: 12/16/2022]
Abstract
OBJECTIVE Oral epithelial cells act not only as mechanical barriers but also as immunological barriers by producing various mediators such as cytokines. Since, in periodontal disease, limited information is available regarding the role of oral epithelial cell-derived cytokines on T cell activation, we investigated the responses of human T cells (Jurkat cell) to cytokines in KB cells (an oral epithelial cell line) that had been stimulated with Aggregatibacter actinomycetemcomitans lipopolysaccharide (LPS). DESIGN To evaluate T cell activation in response to the culture supernatant of KB cells, we examined cell proliferation and interferon gamma (IFN-γ) production, which is closely related to periodontal disease, in Jurkat cells. Culture supernatant of LPS-stimulated KB cells enhanced cell proliferation and IFN-γ production in Jurkat cells. To determine the active component within the culture supernatant, the production of epithelial cell-derived cytokines, interleukin-12 (IL-12), IL-15 and IL-18, in LPS-stimulated KB cells was analysed. RESULTS IL-15, but not IL-18, was significantly increased in the culture supernatant of LPS-stimulated KB cells. Moreover, additional anti-IL-15 neutralizing antibody abolished culture supernatant-induced IFN-γ expression in Jurkat cells. CONCLUSION These results suggest that periodontal pathogens induce the production of IL-15 from epithelial cells, and leading the activation of T cells in periodontal lesions.
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Affiliation(s)
- Takayuki Suga
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, 2-11 Suemoridori, Chikusa-ku, Nagoya, Aichi 464-8651, Japan
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24
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Ueda K, Nannya Y, Asai T, Yamamoto G, Hangaishi A, Takahashi T, Imai Y, Kurokawa M. Efficacy and Safety of Modified Rituximab-ESHAP Therapy for Relapsed/Refractory B-Cell Lymphoma. J Chemother 2013; 22:54-7. [DOI: 10.1179/joc.2010.22.1.54] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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25
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Mizutani H, Ishihara Y, Izawa A, Fujihara Y, Kobayashi S, Gotou H, Okabe E, Takeda H, Ozawa Y, Kamiya Y, Kamei H, Kikuchi T, Yamamoto G, Mitani A, Nishihara T, Noguchi T. Lipopolysaccharide of Aggregatibacter actinomycetemcomitans up-regulates inflammatory cytokines, prostaglandin E2 synthesis and osteoclast formation in interleukin-1 receptor antagonist-deficient mice. J Periodontal Res 2013; 48:748-56. [PMID: 23586622 DOI: 10.1111/jre.12065] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/23/2013] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND OBJECTIVE The interleukin (IL)-1 receptor antagonist (Ra) binds to IL-1 receptors and inhibits IL-1 activity. However, it is unclear whether the IL-1Ra plays a protective role in periodontal disease. The purpose of this study was to compare IL-1Ra knockout (KO) and wild-type (WT) mice in regard to proinflammatory cytokine production, osteoclast formation and bone resorption in response to periodontal bacterial lipopolysaccharide (LPS). MATERIAL AND METHODS Peritoneal macrophages (Mφs) were obtained from 13-wk-old IL-1Ra KO and WT mice. Peritoneal Mφs were cultured with or without 10 μg/mL of Aggregatibacter actinomycetemcomitans LPS for 24 h. The levels of IL-1alpha (IL-1α), IL-1beta (IL-1β), tumor necrosis factor-α (TNF-α) and IL-6 were measured in periotoneal Mφs supernatant fluid (PM-SF) using an ELISA. Bone marrow cells were obtained from the mice and stimulated with PM-SF for 9 d, then stained with TRAP. The frequency of TRAP-positive multinucleated giant cell formation was calculated based on a fusion index. PM-SF-stimulated calvarial bone resorption was analyzed using micro-computed tomography, and calvarial histological analysis was performed using hematoxylin and eosin and TRAP staining. The expression of cyclooxygenase-2 (Cox2), prostanoid receptor EP4 (Ep4) and Rank mRNAs in bone marrow cells were measured using real-time quantitative PCR, while prostaglandin E2 (PGE2 ) production was determined by ELISA. RESULTS The levels of IL-1α, IL-1β, TNF-α and IL-6 in IL-1Ra KO mice PM-SF stimulated with A. actinomycetemcomitans LPS were significantly increased by approximately 4- (p < 0.05), 5- (p < 0.05), 1.3- (p < 0.05) and 6- (p < 0.05) fold, respectively, compared with the levels in WT mice. Moreover, osteoclast formation, expression of Rank, Ep4 and Cox2 mRNAs and production of PGE2 were significantly increased by approximately 2- (p < 0.05), 1.6- (p < 0.05), 2.5- (p < 0.05), 1.6- (p < 0.05) and 1.9- (p < 0.05) fold, respectively, in IL-1Ra KO mice stimulated with A. actinomycetemcomitans LPS compared with WT mice. CONCLUSION IL-1Ra regulates IL-1 activity and appears to reduce the levels of other inflammatory cytokines, including TNF-α and IL-6, while it also reduces expression of the EP4 receptor related to prostanoid sensitivity and osteoclast formation. These results suggest that IL-1Ra is an important molecule for inhibition of inflammatory periodontal bone resorption.
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Affiliation(s)
- H Mizutani
- Department of Periodontology, School of Dentistry, Aichi Gakuin University, Nagoya, Aichi, Japan
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26
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Hayashi S, Tanaka J, Okada S, Isobe T, Yamamoto G, Yasuhara R, Irie T, Akiyama C, Kohno Y, Tachikawa T, Mishima K. Lin28a is a putative factor in regulating cancer stem cell-like properties in side population cells of oral squamous cell carcinoma. Exp Cell Res 2013; 319:1220-8. [PMID: 23500413 DOI: 10.1016/j.yexcr.2013.03.004] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2013] [Revised: 02/24/2013] [Accepted: 03/02/2013] [Indexed: 01/06/2023]
Abstract
Cancer stem cells (CSCs) are among the target cells of cancer therapy because they are uniquely involved in both cancer progression and sensitivity to chemotherapeutic agents. We identified side population (SP) cells, which are known to be an enriched population of CSC, in five oral squamous cell carcinoma (OSCC) cells (SCC9, SCC25, TOSCC7, TOSCC17, and TOSCC23). The percentages of SP cells ranged from 0% to 3.3%, with TOSCC23 cells showing the highest percentages of SP cells (3.3% of the total cell population). The SP cells isolated from TOSCC23 cells also showed greater cell proliferation and invasion compared to non-SP (MP) cells. Therefore, our initial findings suggested that SP cells were enriched for CSC-like cells. Furthermore, DNA microarray analysis revealed that the expression of cell proliferation-related and anti-apoptotic genes was greater in SP cells compared to MP cells. We focused on Lin28a, which showed the highest expression (approximately 22-fold) among the upregulated genes. The overexpression of Lin28a in TOSCC23 cells increased their proliferation, colony formation, and invasion. These findings suggest that Lin28a is an appropriate CSC target molecule for OSCC treatment.
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Affiliation(s)
- S Hayashi
- Division of Pathology, Department of Oral Diagnostic Sciences, School of Dentistry, Showa University, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo 142-8555, Japan
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28
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Nishii K, Usui M, Yamamoto G, Yajima S, Tsukamoto Y, Tanaka J, Tachikawa T, Yamamoto M. The distribution and expression of S100A8 and S100A9 in gingival epithelium of mice. J Periodontal Res 2012; 48:235-42. [DOI: 10.1111/jre.12000] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/18/2012] [Indexed: 01/08/2023]
Affiliation(s)
- K. Nishii
- Department of Periodontology; Showa University School of Dentistry; Ohta-ku Tokyo Japan
- Department of Oral Pathology and Diagnosis; Showa University School of Dentistry; Shinagawa-ku Tokyo Japan
| | - M. Usui
- Department of Periodontology; Showa University School of Dentistry; Ohta-ku Tokyo Japan
- Department of Periodontology; Kyushu Dental College; Kokurakita-ku Kitakyushu city Fukuoka Japan
| | - G. Yamamoto
- Department of Oral Pathology and Diagnosis; Showa University School of Dentistry; Shinagawa-ku Tokyo Japan
| | - S. Yajima
- Department of Periodontology; Showa University School of Dentistry; Ohta-ku Tokyo Japan
- Department of Oral Pathology and Diagnosis; Showa University School of Dentistry; Shinagawa-ku Tokyo Japan
| | - Y. Tsukamoto
- Department of Periodontology; Showa University School of Dentistry; Ohta-ku Tokyo Japan
| | - J. Tanaka
- Department of Oral Pathology and Diagnosis; Showa University School of Dentistry; Shinagawa-ku Tokyo Japan
| | - T. Tachikawa
- Department of Oral Pathology and Diagnosis; Showa University School of Dentistry; Shinagawa-ku Tokyo Japan
- Comprehensive Research Center of Oral Cancer; Showa University School of Dentistry; Shinagawa-ku Tokyo Japan
| | - M. Yamamoto
- Department of Periodontology; Showa University School of Dentistry; Ohta-ku Tokyo Japan
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Tsunoda Y, Sakamoto M, Fukma E, Sawada T, Sasaki A, Yamamoto G, Tachikawa T. Gene Expression Profiling in Estorogen Receptor Positive Breast Cancer With Cancer Stem-Like Cells. Ann Oncol 2012. [DOI: 10.1016/s0923-7534(20)32782-4] [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: 10/25/2022] Open
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Tsukamoto Y, Usui M, Yamamoto G, Takagi Y, Tachikawa T, Yamamoto M, Nakamura M. Role of the junctional epithelium in periodontal innate defense and homeostasis. J Periodontal Res 2012; 47:750-7. [PMID: 22587460 DOI: 10.1111/j.1600-0765.2012.01490.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND AND OBJECTIVE The junctional epithelium provides the front-line defense against periodontal bacterial infection. The migration of neutrophils into the junctional epithelium might represent a protective reaction against bacterial infections. However, neutrophils penetrate into the junctional epithelium even under sterile conditions. In this study, we analyzed and compared the number of neutrophils and the cytokine expression related to neutrophil migration in the junctional epithelium in conventional and germ-free mice. MATERIAL AND METHODS Germ-free and conventional ICR mice were used at 12 wk of age. Frozen sections were used for the detection of Gr-1, macrophage inflammatory protein-2 (MIP-2/CXCL2) and proliferating cell nuclear antigen-positive cells in the two groups of mice. Laser capture microdissection and RT-PCR analysis were used to evaluate the expression of keratinocyte-derived chemokine (KC/CXCL1), MIP-2, interleukin-1β (IL-1β) and tumor necrosis factor-α (TNF-α) mRNAs in the two groups of mice. RESULTS Morphometric examination indicated an increase in the area of the junctional epithelium upon bacterial infection. Immunohistochemical studies also detected an increased number of neutrophils in the junctional epithelium upon bacterial infection. Higher up-regulation of KC and MIP-2 were detected in the junctional epithelium of conventional mice than in germ-free mice, whereas the expression of Il-1β and Tnfα mRNAs was not affected. CONCLUSION Junctional epithelium cells constitutively expressed several types of chemokines and cytokines and the expression of chemokines was augmented by bacterial infection. Therefore, the constitutive expression of cytokines in junctional epithelium might be related to the morphological and functional homeostasis of the junctional epithelium in addition to the defense against the bacterial infection.
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Affiliation(s)
- Y Tsukamoto
- Department of Oral Anatomy and Developmental Biology, Showa University School of Dentistry, Shinagawa-ku, Tokyo, Japan
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Tsunoda Y, Sakamoto M, Sawada T, Sasaki A, Yamamoto G, Tachikawa T. Characteristic Genes in Luminal Subtype Breast Tumors with CD44+CD24–/Low Gene Expression Signature. Oncology 2011; 81:336-44. [DOI: 10.1159/000334690] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2011] [Accepted: 10/21/2011] [Indexed: 12/21/2022]
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Hayashi Y, Matsunaga T, Yamamoto G, Nishii K, Usui M, Yamamoto M, Tachikawa T. Comprehensive analysis of gene expression in the junctional epithelium by laser microdissection and microarray analysis. J Periodontal Res 2010; 45:618-25. [PMID: 20546111 DOI: 10.1111/j.1600-0765.2010.01276.x] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
BACKGROUND AND OBJECTIVE The junctional epithelium attaches to the tooth enamel at the dentogingival junction. The attachment mechanisms of the junctional epithelium have been studied histologically, but the molecular functions of the junctional epithelium have not been elucidated. The aim of this study was to perform a comprehensive analysis of gene expression in the junctional epithelium and to search for specific genetic markers of the junctional epithelium. MATERIAL AND METHODS A comprehensive analysis of genes expressed in the mouse junctional epithelium and oral gingival epithelium was performed using laser microdissection and microarray analysis. To extract high-quality RNA from these tissues, we made frozen sections using a modified film method. Confirmation of the differential expression of selected genes was performed by quantitative real-time PCR and immunohistochemistry. RESULTS The modified method produced RNA of sufficient quality for microarray analysis. The result of microarray analysis showed that 841 genes were up-regulated in the junctional epithelium compared with the oral gingival epithelium, and five were increased more than 50-fold in the junctional epithelium. These five genes were secretory leukocyte protease inhibitor (Slpi), keratin 17 (Krt17), annexin A1 (Anxa1), myosin light peptide 6 (Myl6) and endoplasmic reticulum protein 29 (Erp29). In particular, Slpi expression in the junctional epithelium was approximately 100-fold higher than in the oral gingival epithelium by real-time PCR. Additionally, immunohistochemistry indicated that the Slpi protein is highly expressed in the junctional epithelium. CONCLUSION We developed a method for generating fresh-frozen tissue sections suitable for extraction of good-quality RNA. We determined that Slpi is characteristically expressed in the junctional epithelium. Our results provide a substantial advance in the analysis of gene expression in the junctional epithelium.
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Affiliation(s)
- Y Hayashi
- Department of Periodontology, Showa University School of Dentistry, Ohta-ku, Tokyo, Japan
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Okada S, Nannya Y, Ota S, Takazawa Y, Yamamoto G, Kumano K, Izutsu K, Takahashi T, Chiba S, Kurokawa M. Cutaneous T-cell lymphoma (mycosis fungoides) relapsed with different immunological phenotype after bone marrow transplant. Br J Dermatol 2009; 162:229-30. [DOI: 10.1111/j.1365-2133.2009.09541.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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34
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Matsunaga T, Yamamoto G, Tachikawa T. Expression of typical calpains in mouse molar. Arch Oral Biol 2009; 54:885-92. [DOI: 10.1016/j.archoralbio.2009.07.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2009] [Revised: 07/03/2009] [Accepted: 07/16/2009] [Indexed: 12/15/2022]
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35
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Higo T, Mukaisho K, Ling ZQ, Oue K, Chen KH, Araki Y, Sugihara H, Yamamoto G, Hattori T. An animal model of intrinsic dental erosion caused by gastro-oesophageal reflux disease. Oral Dis 2009; 15:360-5. [PMID: 19371399 DOI: 10.1111/j.1601-0825.2009.01561.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
OBJECTIVES To explore the association between dental erosion and gastro-oesophageal reflux disease (GORD), we used an animal model of GORD. MATERIALS AND METHODS We performed an operation to force gastro-duodenal contents reflux in male Wistar rats, and examined the teeth in the reflux rats at 15 or 30 weeks postoperatively. Dental erosion was evaluated based on a slightly modified index from a previous report. Estimation of pH was employed in the oesophageal and gastric contents. RESULTS Macroscopically, dental erosion was only detected in the reflux rats. Histopathologically, dentin exposure was detected in three of the seven cases after 30 weeks. Alveolar bone destruction and osteomyelitis were also noted in severe cases. The pH of the oesophageal and stomach contents was 6.93 +/- 0.15 and 3.7 +/- 0.39, respectively. CONCLUSIONS We confirmed the relationship between dental erosion and GORD. First step of dental erosion caused by GORD is the loss of surface enamel induced by regurgitation of an acidic liquid and acidic gas. Subsequently, further destruction of dental hard tissues and tooth supporting structure is accelerated by mixed juice with gastric and duodenal contents. The reflux animal model is a useful tool to examine the mechanism of dental erosion in GORD.
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Affiliation(s)
- T Higo
- Department of Pathology, Shiga University of Medical Science, Otsu, Shiga, Japan
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36
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Uchiyama Y, Sugimoto J, Shibata M, Yamamoto G, Mazaki Y. Structural studies of 9,10-diheteratriptycenes with group 15 elements and their halogen adducts. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308086790] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Yamamoto G, Omori M, Hashida T, Kimura H. A novel structure for carbon nanotube reinforced alumina composites with improved mechanical properties. Nanotechnology 2008; 19:315708. [PMID: 21828800 DOI: 10.1088/0957-4484/19/31/315708] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Engineering ceramics have high stiffness, excellent thermostability, and relatively low density, but their brittleness impedes their use as structural materials. Incorporating carbon nanotubes (CNTs) into a brittle ceramic might be expected to provide CNT/ceramic composites with both high toughness and high temperature stability. Until now, however, materials fabrication difficulties have limited research on CNT/ceramic composites. The mechanical failure of CNT/ceramic composites reported previously is primarily attributed to poor CNT-matrix connectivity and severe phase segregation. Here we show that a novel processing approach based on the precursor method can diminish the phase segregation of multi-walled carbon nanotubes (MWCNTs), and render MWCNT/alumina composites highly homogeneous. The MWCNTs used in this study are modified with an acid treatment. Combined with a mechanical interlock induced by the chemically modified MWCNTs, this approach leads to improved mechanical properties. Mechanical measurements reveal that only 0.9 vol% acid-treated MWCNT addition results in 27% and 25% simultaneous increases in bending strength (689.6 ± 29.1 MPa) and fracture toughness (5.90 ± 0.27 MPa m(1/2)), respectively.
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Affiliation(s)
- G Yamamoto
- Institute of Fluid Science, Tohoku University, Sendai 980-8577, Japan. Graduate School of Environmental Studies, Tohoku University, Sendai 980-8579, Japan
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Takeuchi A, Inagaki K, Okochi H, Mori C, Ando K, Yamaguchi M, Yamamoto G, Hayashi J, Noguchi T, Morita I, Nakagaki H. Social nicotine dependence and the efficacy of anti-smoking education among dental hygienists. ACTA ACUST UNITED AC 2008. [DOI: 10.2329/perio.50.185] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Ayumi Takeuchi
- Division of Dental Hygiene, Aichi Gakuin Dental Hospital,
| | - Koji Inagaki
- Department of Dental Hygiene, Aichi Gakuin University Junior College,
- Department of Periodontology,
| | - Hiromi Okochi
- Division of Dental Hygiene, Aichi Gakuin Dental Hospital,
| | - Chiemi Mori
- Division of Dental Hygiene, Aichi Gakuin Dental Hospital,
| | - Kazue Ando
- Division of Dental Hygiene, Aichi Gakuin Dental Hospital,
| | | | | | | | | | - Ichizo Morita
- Department of Preventive Dentistry and Dental Public Health, School of Dentistry, Aichi Gakuin University
| | - Haruo Nakagaki
- Department of Preventive Dentistry and Dental Public Health, School of Dentistry, Aichi Gakuin University
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Inagaki K, Kurosu Y, Sakano M, Yamamoto G, Kikuchi T, Noguchi T, Yano H, Izawa H, Hachiya Y. [Oral osteoporosis: a review and its dental implications]. Clin Calcium 2007; 17:157-163. [PMID: 17272871] [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: 05/25/2023]
Abstract
In post-menopausal osteoporosis, lack of estrogen will affect the remodeling of the bone tissue in such a way that, in most patients with periodontitis, the amount of bone resorbed exceeds that being formed, resulting in net bone loss. Osteoporosis can be treated by a variety of methods, the hormone replacement therapy (HRT), the selective estrogen receptor modulators (SERM) and the bisphosphonates. The HRT or bisphosphonates treatments improve the clinical outcome of periodontal disease and may be an adjunctive treatment to preserve periodontal bone mass. This paper reviews the current evidence on the mechanism of periodontal breakdown after menopause and the benefit to oral health by treatments for osteoporosis.
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Affiliation(s)
- Koji Inagaki
- Aichi-Gakuin University, School of Dentistry, Department of Periodontology
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40
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Inoda H, Yamamoto G, Hattori T. rh-BMP2-induced ectopic bone for grafting critical size defects: a preliminary histological evaluation in rat calvariae. Int J Oral Maxillofac Surg 2006; 36:39-44. [PMID: 17005372 DOI: 10.1016/j.ijom.2006.07.011] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2005] [Revised: 04/10/2006] [Accepted: 07/12/2006] [Indexed: 11/19/2022]
Abstract
The aim of this study was to evaluate histologically the biological usefulness of recombinant human BMP2 (rh-BMP2)-induced ectopically-formed bone as graft material to repair a bone defect model, compared with autogenous bone and frozen allogeneic bone. Forty-five male Wistar rats were used, which were divided into three graft groups. Each of the three graft groups was divided into three observation period groups (3, 6 and 9 weeks after graft). All rats underwent craniotomy to create a bone defect, and then received a bone graft. In the rh-BMP2-induced ectopic bone graft group, marked bone formation was seen from 3 weeks after graft. In the autogenous bone graft group, marked bone formation was seen from 6 weeks after graft. In the group that received a frozen allogeneic bone graft, marked bone formation was seen from 9 weeks after graft. At 3, 6 and 9 weeks after graft, newly formed bone area was significantly greater in the tissue engineered bone (TEB) group than in the auto or frozen allogeneic bone (FAB) group. rh-BMP2-induced ectopically-formed bone graft exhibited better osteoconductivity than autogenous bone graft and frozen allogeneic bone graft. These histological findings indicate that rh-BMP2-induced ectopically-formed bone is suitable as bone graft material.
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Affiliation(s)
- H Inoda
- Department of Oral and Maxillofacial Surgery, Shiga University of Medical Science, Setatsukinowacho Otsu, Shiga, Japan.
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41
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Abstract
Monkey embryonic stem (ES) cells are useful tools in preclinical studies of gene therapy and tissue engineering as well as in primate developmental biology. However, their maintenance is not easy, requiring addition of bFGF to the medium. Herein, we have described a stable, cost-effective method that does not require bFGF. We used a high-density (1 to 1.5x10(5) cells/cm2) of mouse embryonic fibroblasts (MEF) as feeder cells to successfully maintain undifferentiated monkey ES cells for 2 years (approximately 150 passages). Furthermore, these ES cells were competent for electroporation of enhanced green fluorescent protein (EGFP) and subsequent drug selection procedures. We were able to establish EGFP-expressing cell lines using this culture condition. These cell lines expressed undifferentiated markers, such as alkaline phosphatase, SSEA-4, TRA-60, and TRA-81. In addition, strong EGFP expression was observed after differentiation into cardiomyocytes, neurons, or adipocytes, suggesting that these cell lines are a useful tool to study cell transplantation. This method simplifies the culture of monkey ES cells.
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Affiliation(s)
- A Yamashita
- Research Center for Animal Life Science, Shiga University of Medical Science, Ohtsu, Japan
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42
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Inagaki K, Kurosu Y, Sakano M, Sugiishi T, Yamamoto G, Noguchi T, Yano H, Izawa H, Hachiya Y. [Osteoporosis and periodontal disease in postmenopausal women: association and mechanisms]. Clin Calcium 2006; 16:269-277. [PMID: 16465029] [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: 05/25/2023]
Abstract
Many studies have attempted to define the relationship between postmenopausal osteoporosis and periodontal disease. Most studies support a positive association between these common diseases; however, many are cross-sectional in nature, include relatively small sample sizes, and have inadequate control of potential confounding factors, such as age, gender, hormone intake, race, and smoking, limiting our understanding of the nature of the relationship between these diseases. Clinical conditions causing low estrogen environments in postmenopausal women allow T- and B-cell abnormalities, increased local production of the bone-active cytokines (i.e., Interleukin-1, -6 and -8, tumor necrosis factor [TNF]-alpha) and a rise in prostaglandin E(2), resulting in the progression of periodontitis.
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Affiliation(s)
- Koji Inagaki
- Department of Periodontology, School of Dentistry, Aichi-Gakuin University
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43
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Sugiishi T, Inagaki K, Kurosu Y, Fuma D, Sakano M, Yamamoto G, Yoshinari N, Noguchi T, Morita I, Nakagaki H. Relationship between Periodontal and Osteoporotic Parameters in Postmenopausal Women. ACTA ACUST UNITED AC 2006. [DOI: 10.2329/perio.48.10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Iwata T, Mitani A, Ishihara Y, Tanaka S, Yamamoto G, Kikuchi T, Naganawa T, Matsumura Y, Suga T, Koide M, Sobue T, Suzuki T, Noguchi T. Actinobacillus actinomycetemcomitans Y4 capsular polysaccharide induces IL-1beta mRNA expression through the JNK pathway in differentiated THP-1 cells. Clin Exp Immunol 2005; 141:261-9. [PMID: 15996190 PMCID: PMC1809438 DOI: 10.1111/j.1365-2249.2005.02836.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [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: 11/26/2022] Open
Abstract
Capsular polysaccharide from Actinobacillus actinomycetemcomitans Y4 (Y4 CP) induces bone resorption in a mouse organ culture system and osteoclast formation in mouse bone marrow cultures, as reported in previous studies. We also found that Y4 CP inhibits the release of interleukin (IL)-6 and IL-8 from human gingival fibroblast (HGF). Thus Y4 CP induces various responses in localized tissue and leads to the secretion of several cytokines. However, the effects of Y4 CP on human monocytes/macrophages are still unclear. In this study, THP-1 cells, which are a human monocytic cell line, were stimulated with Y4 CP, and we measured gene expression in inflammatory cytokine and signal transduction pathways. IL-1beta and tumour necrosis factor (TNF)-alpha mRNA were induced from Y4 CP-treated THP-1 cells. IL-1beta mRNA expression was increased according to the dose of Y4 CP, and in a time-dependent manner. IL-1beta mRNA expression induced by Y4 CP (100 microg/ml) was approximately 7- to 10-fold greater than that in the control by real-time PCR analysis. Furthermore, neither PD98059, a specific inhibitor of extracellular signal-regulated kinase nor SB203580, a specific inhibitor of p38 kinase prevented the IL-1beta expression induced by Y4 CP. However, JNK Inhibitor II, a specific inhibitor of c-Jun N-terminal kinase (JNK) prevented the IL-1beta mRNA expression induced by Y4 CP in a concentration-dependent manner. These results indicate that Y4 CP-mediated JNK pathways play an important role in the regulation of IL-1beta mRNA. Therefore, Y4 CP-transduced signals for IL-1beta induction in the antibacterial action of macrophages may provide a therapeutic strategy for periodontitis.
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Affiliation(s)
- T Iwata
- Department of Periodontology, School of Dentistry, Aichi-Gakuin University, Nagoya 464-8651, Japan
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Irisawa A, Saito A, Obara K, Shibukawa G, Takagi T, Yamamoto G, Sakamoto H, Takiguchi F, Shishido H, Hikichi T, Oyama H, Sato N, Katakura K, Kasukawa R, Sato Y. Usefulness of endoscopic ultrasonographic analysis of variceal hemodynamics for the treatment of esophageal varices. Fukushima J Med Sci 2001; 47:39-50. [PMID: 11989618 DOI: 10.5387/fms.47.39] [Citation(s) in RCA: 5] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
The correlation of between the endoscopic findings of esophageal varices and endoscopic ultrasound findings of the collaterals outside the esophageal wall in patients with portal hypertension remains unclear. We investigated the relationship between esophageal varices and the collaterals by endoscopy and endoscopic ultrasound. Moreover, we investigated the correlation between the collaterals around the esophagus and recurrence of esophageal varices in patients with portal hypertension who had undergone endoscopic injection sclerotherapy. The collaterals were divided into two groups: 1; those with peri-esophageal collateral veins (peri-ECVs) adjacent to the muscularis externa of the esophagus, and 2; those with para-esophageal collateral veins (para-ECVs) distal to the esophageal wall without contact with the muscularis externa. Peri- and para-ECVs were scored as mild or severe according to the stage of development. According to endoscopy, the varix form was significantly larger in severe peri-ECVs group than in mild peri-ECVs group. In contrast, the varix form did not differ significantly between the mild and severe para-ECVs group. The prevalence of perforating veins increased according to the varix form. With regard to variceal recurrence, in patients with variceal recurrences, EUS findings included a significantly higher incidence of severe-type peri-ECVs, a significantly larger number of perforating veins, and a significantly larger diameter of perforating veins compared with patients without recurrence. Moreover, when EUS found the abnormalities when no endoscopic recurrence was found, the results were the almost same as the findings when EUS was performed at the same time when endoscopic recurrence was found. In conclusion, the presence of severe peri-ECVs and large perforating veins in the esophageal wall strongly correlates with occurrence and recurrence of esophageal varices in patients with portal hypertension. An understanding of these EUS abnormalities on the basis of hemodynamics around the esophagus is thought to be important for management of esophageal varices in patients with portal hypertension.
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Affiliation(s)
- A Irisawa
- Department of Internal Medicine II, Fukushima Medical University School of Medicine, Fukushima City, Japan
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Matsubara K, Nishiyama Y, Katayama K, Yamamoto G, Sugiyama M, Murai T, Baba K. Change of antimicrobial susceptibility of group B streptococci over 15 years in Japan. J Antimicrob Chemother 2001; 48:579-82. [PMID: 11581242 DOI: 10.1093/jac/48.4.579] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [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: 11/15/2022] Open
Abstract
We compared antimicrobial susceptibility patterns of 206 group B streptococcal (GBS) strains isolated from pregnant women and six from neonates/infants with invasive infection during the two periods 1985-1986 and 1999-2000. All strains in both periods were susceptible to the penicillins, cephalosporins and carbapenem tested. Seven (3%) isolates were resistant to erythromycin and three (1%) were resistant to clindamycin. There were no significant differences between the two study periods in the incidence of GBS resistant to the 14 antibiotics tested. These results showed that penicillins are still the first choice to prevent vertical transmission of GBS in Japan.
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Affiliation(s)
- K Matsubara
- Department of Pediatrics, Nishi-Kobe Medical Center, 5-7-1 Kojidai, Nishi-ku, Kobe 651-2273, Japan.
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Yamamoto G, Shimada T, Nishida T, Ishida Y, Iba T, Nakata T, Ohtsuki T, Takigami K, Yamaguchi Y, Yoshitake K, Tanaka A, Tsuda Y. [Evaluation of a combination chemotherapy with nedaplatin and 5-FU for oral cancers]. Gan To Kagaku Ryoho 2001; 28:1111-5. [PMID: 11525027] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
Abstract
Nedaplatin (cis-diammine-glycolato platinum: CDGP) is a platinum compound with a molecular weight of 303.18 that was recently developed in Japan. There have been reports of the antineoplastic effects of Nedaplatin on cancers in the cranio-cervical region, lung, esophagus, urinary bladder, testis, ovary, and uterus. In this study, we performed combined therapy of CDGP and fluorouracil (5-FU) for 8 patients with oral cancers, and evaluated the results to elucidate the clinical effect and adverse side effects. The subjects were 8 patients with squamous cell carcinoma (5 males and 3 females aged 33-65 years). The primary carcinoma regions were the tongue in 5 patients, oral floor in 2 patients, and mandibular gingiva in 1 patient. The T-classification was T2 in 6 patients and T4 in 2 patients, and the clinical staging was Stage II in 5 patients, Stage III in 1 patient and Stage IV in 2 patients. We first administered 700 mg/m2 5-FU per day from day 1 to day 5 (total dose 3,500 mg/m2), then 90 mg/m2 CDGP on day 5. The clinical effect was evaluated as a partial response in all cases, showing a 100% success rate. The histopathological findings of resected tumors were evaluated by Ohboshi and Shimozato's classification. One patient was Grade IIA, 5 patients Grade IIB, and 2 patients Grade III. The adverse side effects were slight myelotoxicity, gagging, nausea, alopecia, and stomatitis less than Grade II. Although the oral cancers in this study were extroverted superficial ulcerative cancers, and the number of patients was low at 8, this combined therapy is considered useful and worth evaluating in further accumulated cases.
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Affiliation(s)
- G Yamamoto
- Dept. of Oral and Maxillofacial Surgery, Shiga University of Medical Science
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48
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Kikuchi T, Matsuguchi T, Tsuboi N, Mitani A, Tanaka S, Matsuoka M, Yamamoto G, Hishikawa T, Noguchi T, Yoshikai Y. Gene expression of osteoclast differentiation factor is induced by lipopolysaccharide in mouse osteoblasts via Toll-like receptors. J Immunol 2001; 166:3574-9. [PMID: 11207318 DOI: 10.4049/jimmunol.166.5.3574] [Citation(s) in RCA: 197] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Osteoclast differentiation factor (ODF), a recently identified cytokine of the TNF family, is expressed as a membrane-associated protein in osteoblasts and stromal cells. ODF stimulates the differentiation of osteoclast precursors into osteoclasts in the presence of M-CSF. Here we investigated the effects of LPS on the gene expression of ODF in mouse osteoblasts and an osteoblast cell line and found that LPS increased the ODF mRNA level. A specific inhibitor of extracellular signal-regulated kinase or protein kinase C inhibited this up-regulation, indicating that extracellular signal-regulated kinase and protein kinase C activation was involved. A protein synthesis inhibitor, cycloheximide, rather enhanced the LPS-mediated increase of ODF mRNA, and both a neutralizing Ab of TNF-alpha and a specific inhibitor of PGE synthesis failed to block the ODF mRNA increase by native LPS. Thus, LPS directly induced ODF mRNA. Mouse osteoblasts and an osteoblast cell line constitutively expressed Toll-like receptor (TLR) 2 and 4, which are known as putative LPS receptors. ODF mRNA increases in response to synthetic lipid A were defective in primary osteoblasts from C3H/HeJ mice that contain a nonfunctional mutation in the TLR4 gene, suggesting that TLR4 plays an essential role in the process. Altogether, our results indicate that ODF gene expression is directly increased in osteoblasts by LPS treatment via TLR, and this pathway may play an important role in the pathogenesis of LPS-mediated bone disorders, such as periodontitis.
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Affiliation(s)
- T Kikuchi
- Laboratory of Host Defense and Germfree Life, Research Institute for Disease Mechanism and Control, Nagoya University School of Medicine, Nagoya, Japan
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Ohnishi H, Fujiyama R, Tomioka H, Tada K, Yamamoto G, Sakashita T, Iwasaki H. [A case of pulmonary Nocardia farcinica infection in a patient with non-tuberculous mycobacteriosis]. Kansenshogaku Zasshi 2000; 74:274-7. [PMID: 10783584 DOI: 10.11150/kansenshogakuzasshi1970.74.274] [Citation(s) in RCA: 5] [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] [Indexed: 11/12/2022]
Abstract
A 64 years old woman without systemic immunological disorders was admitted to our hospital because of a productive cough, low grade fever and bloody sputum. Chest X-ray revealed multiple nodules with calcification, infiltrates and bronchiectasis. Laboratory findings showed mild hypoproteinemia and elevated sedimentation rate. Both Nocardia farcinica and Mycobacterium intracellulare were isolated from the bronchial lavage fluid. Administration of sulfamethoxazole-trimethoprim improved her symptoms. In a recurrent study of bronchial lavage N. farcinica was not isolated, but M. intracellurale was still isolated. We believe that N. farcinica may cause infectious exacerbation of chronic lung disease: non-tuberculous mycobacteriosis and bronchiectasis.
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Affiliation(s)
- H Ohnishi
- Department of Respiratory Medicine, Nishi-Kobe Medical Center
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Tanaka S, Kimura Y, Mitani A, Yamamoto G, Nishimura H, Spallek R, Singh M, Noguchi T, Yoshikai Y. Activation of T cells recognizing an epitope of heat-shock protein 70 can protect against rat adjuvant arthritis. J Immunol 1999; 163:5560-5. [PMID: 10553084] [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: 02/14/2023]
Abstract
We have previously reported that CD4+ T cells recognizing a peptide comprising residues 234-252 of the heat shock protein (HSP)70 of Mycobacterium tuberculosis (M.tb) in the context of RT1.B MHC class II molecule emerged in the peritoneal cavity during the course of Listeria monocytogenes infection in rats and suppressed the inflammatory responses against listerial infection via IL-10 production. We report in this work that pretreatment with peptide 234-252 of HSP70 derived from M.tb suppressed the development of adjuvant arthritis (AA) in Lewis rats induced using heat-killed M.tb. T cells from rats pretreated with peptide 234-252 produced a significant amount of IL-10 in response to the epitope. T cells from rats pretreated with the peptide and immunized with M.tb produced the larger amount of IL-10 in response to the peptide, but only a marginal level of IFN-gamma in response to purified protein derivative of M.tb. Administration of anti-IL-10 Ab partly inhibited the suppressive effect of pretreatment with peptide 234-252 on the development of AA. Furthermore, transfer of a T cell line specific for the epitope at the time of AA induction markedly suppressed AA. These findings suggested that T cells recognizing peptide 234-252 may play a regulatory role in inflammation during AA via the production of suppressive cytokines including IL-10.
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Affiliation(s)
- S Tanaka
- Laboratory of Host Defense and Germfree Life, Research Institute for Disease Mechanism and Control, Nagoya University School of Medicine, Japan
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