著者

Eisuke KAWANO Taku TORIUMI Shinya IGUCHI Daigo SUZUKI Shuichi SATO Masaki HONDA

出版者

バイオメディカルリサーチプレス

雑誌

Biomedical Research (ISSN:03886107)

巻号頁・発行日

vol.38, no.2, pp.135-147, 2017-04-01 (Released:2017-04-22)

参考文献数

63

被引用文献数

22

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We previously generated induced pluripotent stem (iPS) cells from human dental pulp cells of deciduous teeth. Neural crest cells (NCCs) play a vital role in the development of the oral and maxillofacial region. Therefore, NCCs represent a cell source for bone, cartilage, and tooth-related tissue engineering. In this study, we examined whether iPS cells are capable of differentiating into NCCs through modification of the human embryonic stem cell protocol. First, iPS cells were dissociated into single cells and then reaggregated in low-cell-adhesion plates with neural induction medium for 8 days in suspension culture to form neurospheres. The neurospheres were transferred to fibronectin-coated dishes and formed rosette structures. The migrated cells from the rosettes abundantly expressed NCC markers, as evidenced by real-time polymerase chain reaction, immunofluorescence, and flow cytometric analysis. Furthermore, the migrated cells exhibited the ability to differentiate into neural crest lineage cells in vitro. They also exhibited tissue-forming potential in vivo, differentiating into bone and cartilage. Collectively, the migrated cells had similar characteristics to those of NCCs. These results suggest that human dental pulp cell-derived iPS cells are capable of differentiating into NCCs. Therefore, iPS cell-derived NCCs represent cell sources for bone and cartilage tissue engineering.

著者

Hitoshi Sugiyama Shuichi Sato Kazukiyo Nagai

出版者

The Society of Photopolymer Science and Technology(SPST)

雑誌

Journal of Photopolymer Science and Technology (ISSN:09149244)

巻号頁・発行日

vol.34, no.6, pp.571-578, 2021 (Released:2022-08-10)

参考文献数

22

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The photo-alignment properties of 4,4-(hexafluoroisopropylidene) diphthalic anhydride (6FDA)-based polyimides with sterically hindered diamine component were systematically evaluated, such as 6FDA-3,3'-dimethylbenidine, 6FDA-2,7-diaminofluorene, 6FDA- 2,3,5,6-tetramethyl-1,4-phenylene diamine, 6FDA-2,5-diamino-1,4-phenylenediamine, 6FDA-1,4-phenylenediamine, and 6FDA-1,3-phenylenediamine. To evaluate sterically hindered diamine components, the diamine components with varying number of benzyl ring and methyl group were used. The polyimides containing the diamine components with methyl group were well planarity and forming charge transfer complex efficiently. The polyimides showing photo reaction property by linearly polarized ultra violet light induced photo alignment properties, however, the linear structured polyimide induced photo alignment property even it showed poor photo reaction property.

著者

Naoki Murakami Kenji Yoshikawa Kohei Tsukada Noriaki Kamio Yoshinori Hayashi Suzuro Hitomi Yuki Kimura Ikuko Shibuta Ayaka Osada Shuichi Sato Koichi Iwata Masamichi Shinoda

出版者

Nihon University School of Dentistry

雑誌

Journal of Oral Science (ISSN:13434934)

巻号頁・発行日

pp.21-0483, (Released:2021-12-29)

参考文献数

29

被引用文献数

1

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Purpose: Periodontitis progresses with chronic inflammation, without periodontal pain. However, the underlying mechanisms are not well known. Here, the involvement of butyric acid (BA) in periodontal pain sensitivity in Porphyromonas gingivalis (P. gingivalis)-induced periodontitis was examined.Methods: P. gingivalis was inoculated into the ligature which was tied around the molar (P. gingivalis-L) and the gingival mechanical head withdrawal threshold (MHWT) was measured. Following P. gingivalis-L, the expressions of orphan G protein-coupled receptor 41 (GPR41) in trigeminal ganglion (TG) neurons were examined. The amount of gingival BA was analyzed following the P. gingivalis-L and the changes in the MHWT in complete Freund’s adjuvant (CFA)-injected gingival tissue by gingival BA were examined. The changes in the MHWT following P. gingivalis-L by gingival GPR41 antagonist (HA) were examined.Results: No change in the MHWT was observed, GPR41-immunoreactive TG neurons were increased following P. gingivalis-L. The gingival BA amount increased following P. gingivalis-L, and the gingival BA suppressed the decrease in MHWT following CFA. HA decreased MHWT following P. gingivalis-L.Conclusion: Gingival BA modulates periodontal mechanical nociception via GPR41 signaling in P. gingivalis-L-induced periodontitis.

著者

Ryosuke Koshi Kunihito Matsumoto Yusuke Imanishi Takayuki Kawato Shuichi Sato Shigeki Shimba Yoshinori Arai Kazuya Honda

出版者

Nihon University School of Dentistry

雑誌

Journal of Oral Science (ISSN:13434934)

巻号頁・発行日

vol.63, no.1, pp.83-86, 2021 (Released:2020-12-23)

参考文献数

33

被引用文献数

6

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Purpose: Circadian rhythm is associated with the pathogenesis of systemic disease and bone mineral metabolism. This study aimed to radiographically evaluate morphological characteristics of the interalveolar septum in circadian rhythm deficient animals.Methods: Heads of 10 brain and muscle arnt-like protein-1 (BMAL1)-knockout (KO) mice and 10 wild-type mice sacrificed at 36 weeks were imaged using micro-computed tomography. The mean depth from the cementoenamel junction to the alveolar ridge (virtual bone sounding: VBS) of the interalveolar septum between the first and second molars, and the bone mineral density (BMD) of the interalveolar septum and the mandibular inferior cortex region were calculated. Tooth diameter was also measured.Results: The VBS of the interalveolar septum in the BMAL1-KO mice was significantly deeper than that in wild-type mice. The BMD in the BMAL1-KO mice was significantly lower than in the wild-type mice in both regions. No significant difference was observed in tooth diameter between BMAL1-KO and wild-type mice.Conclusion: These results suggest that low BMD in the interalveolar septum accelerates bone resorption in the interalveolar septum in BMAL1-KO mice.

著者

Syo Miyagi Takuya Kusanagi Shuichi Sato

出版者

The Society of Photopolymer Science and Technology(SPST)

雑誌

Journal of Photopolymer Science and Technology (ISSN:09149244)

巻号頁・発行日

vol.32, no.1, pp.33-43, 2019-06-24 (Released:2019-11-14)

参考文献数

20

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The effects of polymer gel electrolyte on the photoelectric and driving characteristics of Prussian blue (PB)-based electrochromic (EC) cells were systematically investigated under different preparation conditions. The EC cells were switched from the coloring to decoloring mode by applying ±1.5 V. Subsequently, we prepared an automatic driving circuit wherein the signal of the voltage was alternately applied. The thickness of the PB layer significantly depended on the switching speed as opposed to the electrolyte concentration and the polymer gel electrolyte. In particular, the speed of coloring exceeds that of decoloring due to the electron exchange in the chemical reaction. The speed varied from approximately 5 to 10 times based on the type of the electrolyte.

著者

Tatsuro Suzuki Masahiro Kondo Ikuko Shibuta Hidekazu Nagashima Naoyuki Sugano Shuichi Sato Koichi Iwata

出版者

Nihon University School of Dentistry

雑誌

Journal of Oral Science (ISSN:13434934)

巻号頁・発行日

vol.60, no.4, pp.500-506, 2018 (Released:2018-12-27)

参考文献数

25

被引用文献数

1

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The inferior alveolar nerve (IAN) comprises several types of sensory fibers. To clarify whether each type of primary afferent is regenerated comparably after injury, we developed a model of complete IAN transection (IANX) in mice. A retrograde tracer, fluoro-gold, injected into the mental skin was transferred to the cell bodies of a subset of isolectin B4 (IB4)-binding (non-peptidergic C) or CGRP-positive (peptidergic C) neurons at 2 weeks post-axotomy, indicating that the injured C afferents had regenerated anatomically. IANX led to a decrease of IB4-binding and CGRP immunoreactivity (IR) in the trigeminal ganglion (TG) and within the trigeminal spinal subnucleus caudalis (Vc) (i.e. terminals of the central branch of TG neurons). Two weeks after IANX, the reduction in IB4-binding activity and CGRP expression in the TG recovered to the control level; however, IB4-binding within the Vc did not, suggesting that central branch non-peptidergic neurons remained impaired. Two weeks after IANX, pinching or heat stimulus-induced extracellular signal-regulated kinase phosphorylation (pERK) was restored to the control level, but in the case of pinch stimulation the distribution pattern of pERK-IR cells was altered in the Vc. Taken together, our results support the possibility that peptidergic neurons regenerate more efficiently than non-peptidergic neurons after trigeminal nerve injury.

著者

Takanobu Yamamoto Akira Hasuike Ryosuke Koshi Yasumasa Ozawa Manami Ozaki Tatsuya Kubota Shuichi Sato

出版者

Nihon University School of Dentistry

雑誌

Journal of Oral Science (ISSN:13434934)

巻号頁・発行日

pp.17-0362, (Released:2018-08-12)

参考文献数

16

被引用文献数

3

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We used radiological and histological analyses to evaluate the effects of mechanical barrier permeability in a rat model of calvarial guided bone augmentation (GBA). The calvaria of 20 rats were exposed, and one of four types of plastic caps (an occlusive cylindrical plastic cap; a plastic cap with no top; a plastic cap with three holes; and a plastic cap with four holes) was randomly placed on both sides. Newly generated bone in the plastic caps was evaluated with micro-computed tomography (micro-CT) and histological analysis. Micro-CT volumetric analysis and decalcified hematoxylin and eosin-stained sections showed that GBA barrier permeability was inversely associated with the quantity of augmented bone obtained. Masson’s trichrome staining showed that collagen in newly generated bony tissue was more mature in plastic caps with three holes than in those with more-permeable or more-occlusive barriers. Bone augmentation was inhibited in specimens exhibiting invasion of soft tissue through penetrating holes, and barrier permeability was associated with the quantity of augmented bone developed. In conclusion, moderate barrier permeability is optimal for development of mature augmented bone.

著者

Shuichi Sato Tetsuya Chikama Mikio Ohuchi

出版者

The Society of Photopolymer Science and Technology (SPST)

雑誌

Journal of Photopolymer Science and Technology (ISSN:09149244)

巻号頁・発行日

vol.30, no.1, pp.57-67, 2017-06-26 (Released:2017-08-10)

参考文献数

12

被引用文献数

2

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Photoelectric properties and drive characteristics of guest-host (GH)-type liquid crystal cells with yellow, magenta, cyan, green, and gray colors using 4-cyano-4'-pentylbiphenyl (5CB) and three diazo-based dichroic dyes were systematically investigated in different driving modes. The dichroic dyes have structures similar to 5CB; therefore, they uniformly mixed and dispersed into the liquid crystal matrix. The green and gray colors were obtained by mixing appropriate ratios of two or more dyes. Impedance of the GH cells decreased upon the incorporation of the dyes into 5CB. However, the photoelectric properties and drive characteristics of the liquid crystal cells were not altered after the inclusion of the dye. In particular, the alignment of the molecules strongly depended on the cell structure. The GH cells in twisted nematic mode exhibited a low driving voltage of approximately 1.5 V.

著者

Hidekazu Nagashima Masamichi Shinoda Kuniya Honda Noriaki Kamio Akira Hasuike Naoyuki Sugano Yoshinori Arai Shuichi Sato Koichi Iwata

出版者

日本大学歯学部

雑誌

Journal of Oral Science (ISSN:13434934)

巻号頁・発行日

pp.16-0830, (Released:2017-10-31)

参考文献数

45

被引用文献数

13

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Periodontitis caused by bacterial infection gradually progresses accompanied by periodontal tissue destruction. As a result, teeth lose their supporting structures, and this leads to tooth exfoliation. CXC-chemokine receptor 4 (CXCR4) is known to be expressed in lymphocytes, fibroblasts and osteoclasts in periodontal tissues, suggesting that periodontal CXCR4 signaling contributes to alveolar bone resorption in the milieu of periodontitis. However, the role of CXCR4 signaling in the pathogenesis of periodontitis has remained unknown. We established a mouse model of periodontitis by inoculation of Porphyromonas gingivalis (P.g.) into a silk ligature placed around the maxillary molar. Although there was no significant difference in the mechanical sensitivity in the periodontal tissue between P.g. treatment and sham treatment during the experimental period, mechanical allodynia in the periodontal tissue was induced after gingival injection of complete Freund’s adjuvant compared with that resulting from sham and P.g. treatment alone. Moreover, CXCR4 neutralization in the periodontal tissue following P.g. treatment enhanced periodontal inflammatory cell infiltration and depressed alveolar bone resorption. These findings suggest that periodontal CXCR4 signaling in several cell types in P.g.-induced periodontal inflammation depresses alveolar bone resorption in periodontitis. CXCR4 signaling might be a target for therapeutic intervention to prevent alveolar bone resorption in periodontitis.

著者

Mariko Ohtsu Muneaki Tamura Hideto Sasaki Shuichi Sato Masatake Asano

出版者

日本大学歯学部

雑誌

Journal of Oral Science (ISSN:13434934)

巻号頁・発行日

vol.59, no.3, pp.453-456, 2017 (Released:2017-09-14)

参考文献数

16

被引用文献数

1

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The effects of bittern water (BW), obtained from the ocean floor, on cariogenic bacteria and saliva secretion were examined. Streptococcus mutans was mixed with BW for 1, 3, 5, 10, and 20 min to explore the bactericidal effects of BW against cariogenic bacteria. Bacterial viability was calculated by counting the number of colony-forming units on Brain Heart Infusion agar plates. The results indicated a bacterial viability of more than 35% even after 20 min of incubation. Subsequently, the effects of BW on saliva secretion and the salivary concentration of secretory IgA (sIgA) were examined. Gargling with BW significantly augmented saliva secretion. Although the sIgA concentration was reduced, the total sIgA secreted into saliva was increased significantly. Our findings indicate that the use of BW may be a new strategy for the treatment of various oral diseases, including dry mouth.

著者

Mayu Nagao Natsuko Tanabe Soichiro Manaka Tadahiro Takayama Takayuki Kawato Go Torigoe Jumpei Sekino Naoya Tsukune Manami Ozaki Masao Maeno Naoto Suzuki Shuichi Sato

出版者

日本大学歯学部

雑誌

Journal of Oral Science (ISSN:13434934)

巻号頁・発行日

vol.59, no.2, pp.303-309, 2017 (Released:2017-06-22)

参考文献数

51

被引用文献数

12

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Periodontal disease is caused by inflammation induced by Porphyromonas gingivalis (P.g.) lipopolysaccharide (LPS) and involves expression of proinflammatory cytokines such as interleukin (IL)-1, IL-6, tumor necrosis factor-α, and receptor activator of nuclear factor kappa B ligand (RANKL), which are implicated in bone resorption. Low-intensity pulsed ultrasound (LIPUS) is commonly used in the treatment of bone fracture. However, the mechanisms by which LIPUS inhibits LPS-induced inflammatory cytokines are poorly understood. Therefore, we investigated the effects of LIPUS on LPS-induced expression of the proinflammatory cytokines IL-6 and RANKL. MC3T3-E1 cells were incubated in the presence or absence of P.g. LPS and then stimulated with LIPUS for 30 min/day for a maximum of 14 days. LPS increased mRNA and protein expressions of IL-6 and RANKL on day 14. In addition, mRNA expression of COX-2 LPS was higher after 3 and 7 days of LIPUS treatment. PGE2 was induced by LPS after 7 and 14 days of culture. LIPUS suppressed all stimulatory effects of LPS. These results suggest that LIPUS inhibits LPS-induced expression of inflammation cytokines by suppressing PGE2 production and might thus have potential applications in the treatment of periodontitis.

著者

Naoto Yoshinuma Ryosuke Koshi Kazuhiro Kawamoto Masataka Idesawa Naoyuki Sugano Shuichi Sato

出版者

日本大学歯学部

雑誌

Journal of Oral Science (ISSN:13434934)

巻号頁・発行日

vol.58, no.1, pp.137-140, 2016 (Released:2016-03-26)

参考文献数

10

被引用文献数

3

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This case report describes the clinical efficacy of treatment with basic fibroblast growth factor (FGF-2) for periodontal regeneration. A patient with aggressive periodontitis participated in a clinical trial involving administration of 0.3% FGF-2 in comparison with a placebo control. To evaluate the efficacy of FGF-2, standardized radiographs were taken before surgery and at 12, 24, and 36 weeks after FGF-2 treatment. The rate of increase in alveolar bone height was 86.9% at 36 weeks. The 6-year postoperative radiograph showed significant development of alveolar bone in comparison with the first visit. FGF-2 treatment may be effective for periodontal regeneration in cases of aggressive periodontitis. (J Oral Sci 58, 137-140, 2016)