Faculty Profiles - TAKASHIBA Shogo

Papers - TAKASHIBA Shogo

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Cloning and characterization of human TNFα promoter region Reviewed International journal

Shogo Takashiba, Lior Shapira, Salomon Amar, Thomas E. Van Dyke

Gene 131 ( 2 ) 307 - 308 1993.9

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：Elsevier BV

We report the sequence of a 1.2-kb human tumor necrosis factor alpha (TNFalpha) promoter region, which was cloned using PCR. The sequence has several variations from two previous reports and exhibits many potential DNA-binding sites specific to mammalian gene regulatory proteins inducible by lipopolysaccharides.

DOI： 10.1016/0378-1119(93)90314-s

Interleukin-8 is a major neutrophil chemotactic factor derived from cultured human gingival fibroblasts stimulated with interleukin-1 beta or tumor necrosis factor alpha Reviewed International journal

S Takashiba, M Takigawa, K Takahashi, F Myokai, F Nishimura, T Chihara, H Kurihara, Y Nomura, Y Murayama

Infection and Immunity 60 ( 12 ) 5253 - 5258 1992.12

Authorship：Lead author Language：English Publishing type：Research paper (scientific journal) Publisher：American Society for Microbiology

Inflammatory mediators produced by cells in the gingiva have been implicated in the initiation and progression of periodontal disease, a common infectious disease. In this study, we examined the biological activity of neutrophil chemotactic factors and the kinetics of expression of interleukin-8 (IL-8) mRNA derived from normal gingival fibroblasts in response to inflammatory mediators in an in vitro model. Gingival fibroblasts stimulated by either recombinant human interleukin-1 beta or recombinant human tumor necrosis factor alpha produced neutrophil chemotactic factors after 4 h, whereas expression of cell-derived IL-8 mRNA was detected within 1 h after stimulation. Furthermore, in a neutralization assay, rabbit anti-recombinant human IL-8 antiserum inhibited neutrophil chemotactic activity to basal levels. These results provide evidence that gingival fibroblasts synthesize potent chemotactic factors such as IL-8 in the presence of the inflammatory mediators interleukin-1 beta and tumor necrosis factor alpha. The activity of these factors may contribute to neutrophil-mediated processes in the pathogenesis of periodontal disease.

DOI： 10.1128/iai.60.12.5253-5258.1992

Effectiveness of oral health care intervention for stroke patients following the introduction of Oral Health Assessment Tool. Reviewed

Kazuyuki Matsunaga, Ayaka Yoshida-Tsuboi, Ken Inohara, Yasuko Yoshida, Kanako Nakahama, Kazuki Sasaki, Fumie Souda, Yuka Terasawa, Yutaka Shimoe, Kazu Takeuchi-Hatanaka, Tadashi Yamamoto, Kazuhiro Omori, Tatsuo Kohriyama, Shogo Takashiba

Geriatrics & gerontology international 2024.12

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

AIM: This study aimed to evaluate the effectiveness of oral health assessment tools in facilitating oral health care interventions by dental care providers for acute stroke patients within 48 h of admission, following a reform of the nursing system. METHODS: Data were gathered from a retrospective cohort study conducted at a stroke center, comparing 10 months before and after the implementation of the reformed system, with a 2-month interval. Parameters assessed included stroke type, severity measured using the National Institutes of Health Stroke Scale, stroke history, stroke-related factors, number of teeth, hospitalization cost and duration, occurrence of fever and pneumonia, stroke treatment, days from admission to dental intervention, and intervention frequency. RESULTS: Implementation of the new system significantly reduced the time before dental intervention (P < 0.001), increased the frequency of interventions (P < 0.001), and allowed for the management of more severe cases (P = 0.007). However, there was a slight increase in the occurrence of fevers and the days of fever (P = 0.039 and P = 0.015, respectively). Multiple regression analysis showed that fever days were positively correlated with stroke severity and the number of days from admission to dental intervention (P < 0.001 and P = 0.013, respectively). Even after propensity score matching adjusting for stroke severity, these associations persisted. Additional multiple regression analysis was performed after this, but fever days were positively correlated with stroke severity and sex (P < 0.001 and P = 0.008, respectively), as well as with the presence of other factors affecting the occurrence of fever. CONCLUSIONS: Although the frequency and duration of fevers increased slightly, this approach, incorporating oral health assessment tools, made it possible to provide early dental intervention, particularly for patients with severe strokes. Geriatr Gerontol Int 2024; ••: ••-••.

DOI： 10.1111/ggi.15035

Resolvin D2-induced reparative dentin and pulp stem cells after pulpotomy in a rat model Reviewed

Mitsuhiro Yoneda, Hidetaka Ideguchi, Shin Nakamura, Zulema Arias, Mitsuaki Ono, Kazuhiro Omori, Tadashi Yamamoto, Shogo Takashiba

Heliyon 10 ( 13 ) e34206 - e34206 2024.7

Bacterial DNA and serum IgG antibody titer assays for assessing infection of human-pathogenic and dog-pathogenic Porphyromonas species in dogs Reviewed

Masako Tai-Tokuzen, Takashi Ito, Kazuya Tamura, Haruko Hirayama, Hirohito Ogawa, Shin Nakamura, Keisuke Okubo, Kazuhiro Omori, Tadashi Yamamoto, Katsumi Mominoki, Shogo Takashiba

Heliyon 10 ( 11 ) e31872 - e31872 2024.6

Terrein Exhibits Anti-tumor Activity by Suppressing Angiogenin Expression in Malignant Melanoma Cells. Reviewed International journal

Taira Hirose, Yuki Kunisada, Koichi Kadoya, Hiroki Mandai, Yumi Sakamoto, Kyoichi Obata, Kisho Ono, Hiroaki Takakura, Kazuhiro Omori, Shogo Takashiba, Seiji Suga, Soichiro Ibaragi

Cancer genomics & proteomics 21 ( 5 ) 464 - 473 2024

Language：English Publishing type：Research paper (scientific journal)

BACKGROUND/AIM: Malignant melanoma is a tumor with a poor prognosis that can metastasize distally at an early stage. Terrein, a metabolite produced by Aspergillus terreus, suppresses the expression of angiogenin, an angiogenic factor. However, the pharmacological effects of natural terrein have not been elucidated, because only a small amount of terrein can be extracted from large fungal cultures. In this study, we investigated the antineoplastic effects of terrein on human malignant melanoma cells and its underlying mechanisms. MATERIALS AND METHODS: Human malignant melanoma cell lines were cultured in the presence of terrein and analyzed. Angiogenin production was evaluated using ELISA. Ribosome biosynthesis was evaluated using silver staining of the nucleolar organizer region. Intracellular signaling pathways were analyzed using western blotting. Malignant melanoma cells were transplanted subcutaneously into the backs of nude mice. The tumors were removed at 5 weeks and analyzed histopathologically. RESULTS: Terrein inhibited angiogenin expression, proliferation, migration, invasion, and ribosome biosynthesis in malignant melanoma cells. Terrein was shown to inhibit tumor growth and angiogenesis in animal models. CONCLUSION: This study demonstrated that terrein has anti-tumor effects against malignant melanoma. Furthermore, chemically synthesized non-natural terrein can be mass-produced and serve as a novel potential anti-tumor drug candidate.

DOI： 10.21873/cgp.20464

Effect of Periodontal Treatment on Reducing Chronic Inflammation in Systemically Healthy Patients With Periodontal Disease. Reviewed International journal

Shinji Matsuda, Tomoaki Shintani, Tsuyoshi Miyagawa, Hiromichi Yumoto, Yasutaka Komatsu, Nanae Dewake, Takanori Iwata, Takatoshi Nagano, Toshiya Morozumi, Ryoma Goto, Satsuki Kato, Masahiro Kitamura, Kitetsu Shin, Satoshi Sekino, Akiko Yamashita, Keiko Yamashita, Atsutoshi Yoshimura, Tsutomu Sugaya, Shogo Takashiba, Yoichiro Taguchi, Eiji Nemoto, Hiromi Nishi, Noriyoshi Mizuno, Yukihiro Numabe, Hiroyuki Kawaguchi

The American journal of medicine 2023.11

Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: We determined the effects and an accurate marker of periodontal treatment on serum interleukin (IL)-6 and high-sensitivity C-reactive protein (HsCRP) levels in systemically healthy individuals with periodontal disease. METHODS: This multicenter study included systemically healthy individuals with periodontal disease who received initial periodontal treatment and had no periodontal treatment history. Periodontal parameters, including periodontal inflamed surface area, masticatory efficiency, and periodontal disease classification; serum IL-6 and HsCRP levels; and serum immunoglobulin (Ig)G titers against periodontal pathogens were evaluated at baseline and after treatment. Subjects were classified as low or high responders (group) based on periodontal inflamed surface area changes. RESULTS: There were 153 participants. Only periodontal inflamed surface area changes were markedly different between low and high responders. Periodontal treatment (time point) decreased both serum IL-6 and HsCRP levels. The interaction between group and time point was remarkable only for serum IL-6 levels. Changes in serum immunoglobulin (Ig)G titers against periodontal pathogens were not associated with IL-6 changes in high responders. We analyzed the indirect effect of serum anti-Porphyromonas gingivalis type 2 IgG titer changes using mediation analysis and found no significance. However, the direct effect of group (low or high responder) on IL-6 changes was considerable. CONCLUSIONS: Periodontal treatment effectively decreased serum IL-6 levels, independent of periodontal pathogen infection, in systemically healthy individuals with periodontal disease.

DOI： 10.1016/j.amjmed.2023.11.001

Ligneous periodontitis exacerbated by Behçet's disease in a patient with plasminogen deficiency and a stop-gained variant PLG c.1468C > T: a case report. Reviewed International journal

Yuki Shinoda-Ito, Anna Hirai, Kazuhiro Omori, Hidetaka Ideguchi, Hideki Yamamoto, Fumino Kato, Kyoichi Obata, Tatsuo Ogawa, Keisuke Nakano, Takato Nakadoi, Eri Katsuyama, Soichiro Ibaragi, Tadashi Yamamoto, Hitoshi Nagatsuka, Akira Hirasawa, Shogo Takashiba

BMC oral health 23 ( 1 ) 843 - 843 2023.11

Authorship：Corresponding author Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: Plasminogen serves as the precursor to plasmin, an essential element in the fibrinolytic process, and is synthesized primarily in the liver. Plasminogen activation occurs through the action of plasminogen activator, converting it into plasmin. This conversion greatly enhances the fibrinolytic system within tissues and blood vessels, facilitating the dissolution of fibrin clots. Consequently, congenital deficiency of plasminogen results in impaired fibrin degradation. Patients with plasminogen deficiency typically exhibit fibrin deposits in various mucosal sites throughout the body, including the oral cavity, eyes, vagina, and digestive organs. Behcet's disease is a chronic recurrent systemic inflammatory disease with four main symptoms: aphthous ulcers of the oral mucosa, vulvar ulcers, skin symptoms, and eye symptoms, and has been reported worldwide. This disease is highly prevalent around the Silk Road from the Mediterranean to East Asia. We report a case of periodontitis in a patient with these two rare diseases that worsened quickly, leading to alveolar bone destruction. Genetic testing revealed a novel variant characterized by a stop-gain mutation, which may be a previously unidentified etiologic gene associated with decreased plasminogen activity. CASE PRESENTATION: This case report depicts a patient diagnosed with ligneous gingivitis during childhood, originating from plasminogen deficiency and progressing to periodontitis. Genetic testing revealed a suspected association with the PLG c.1468C > T (p.Arg490*) stop-gain mutation. The patient's periodontal condition remained stable with brief intervals of supportive periodontal therapy. However, the emergence of Behçet's disease induced acute systemic inflammation, necessitating hospitalization and treatment with steroids. During hospitalization, the dental approach focused on maintaining oral hygiene and alleviating contact-related pain. The patient's overall health improved with inpatient care and the periodontal tissues deteriorated. CONCLUSIONS: Collaborative efforts between medical and dental professionals are paramount in comprehensively evaluating and treating patients with intricate complications from rare diseases. Furthermore, the PLG c.1468C > T (p.Arg490*) stop-gain mutation could contribute to the association between plasminogen deficiency and related conditions.

DOI： 10.1186/s12903-023-03586-8

Novel Iron Chelators, Super-Polyphenols, Show Antimicrobial Effects against Cariogenic Streptococcus mutans. Reviewed International journal

Yuki Shinoda-Ito, Kazuhiro Omori, Takashi Ito, Masaaki Nakayama, Atsushi Ikeda, Masahiro Ito, Toshiaki Ohara, Shogo Takashiba

Antibiotics (Basel, Switzerland) 12 ( 11 ) 2023.10

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

Dental caries are an oral infectious disease that can affect human health both orally and systemically. It remains an urgent issue to establish a novel antibacterial method to prevent oral infection for a healthy life expectancy. The aim of this study was to evaluate the inhibitory effects of novel iron chelators, super-polyphenols (SPs), on the cariogenic bacterium Streptococcus mutans, in vitro. SPs were developed to reduce the side effects of iron chelation therapy and were either water-soluble or insoluble depending on their isoforms. We found that SP6 and SP10 inhibited bacterial growth equivalent to povidone-iodine, and viability tests indicated that their effects were bacteriostatic. These results suggest that SP6 and SP10 have the potential to control oral bacterial infections such as Streptococcus mutans.

DOI： 10.3390/antibiotics12111562

An RNA-immunoprecipitation via CRISPR/dCas13 reveals an interaction between the SARS-CoV-2 5'UTR RNA and the process of human lipid metabolism. Reviewed International journal

Yurika Shimizu, Srinivas Bandaru, Mari Hara, Sonny Young, Toshikazu Sano, Kaya Usami, Yuta Kurano, Suni Lee, Naoko Kumagai-Takei, Shogo Takashiba, Shunji Sano, Tatsuo Ito

Scientific reports 13 ( 1 ) 10413 - 10413 2023.6

Language：English Publishing type：Research paper (scientific journal)

We herein elucidate the function of SARS-CoV-2derived 5'UTR in the human cells. 5'UTR bound host cellular RNAs were immunoprecipitated by gRNA-dCas13 (targeting luciferase RNA fused to SARS-CoV-2 5'UTR) in HEK293T and A549 cells. The 5'UTR bound RNA extractions were predominantly enriched for regulating lipid metabolism. Overexpression of SARS-CoV-2 5'UTR RNA altered the expression of factors involved in the process of the human Mevalonate pathway. In addition, we found that HMG-CoA reductase inhibitors were shown to suppress SARS-CoV-2 5'UTR-mediated translation activities. In conclusion, we deduce the array of host RNAs interacting with SARS-CoV-2 5'UTR that drives SARS-CoV-2 translation and influences host metabolic pathways.

DOI： 10.1038/s41598-023-36680-6

Recent Advances in Apical Periodontitis Treatment: A Narrative Review Reviewed

Zulema Arias, Mohammed Zahedul Islam Nizami, Xiaoting Chen, Xinyi Chai, Bin Xu, Canyan Kuang, Kazuhiro Omori, Shogo Takashiba

Bioengineering 10 ( 4 ) 488 - 488 2023.4

Authorship：Last author Publishing type：Research paper (scientific journal) Publisher：MDPI AG

Apical periodontitis is an inflammatory response caused by pulp infection. It induces bone resorption in the apical and periapical regions of the tooth. The most conservative approach to treat this condition is nonsurgical endodontic treatment. However, clinical failure has been reported with this approach; thus, alternative procedures are required. This review highlights recent literature regarding advanced approaches for the treatment of apical periodontitis. Various therapies, including biological medications, antioxidants, specialized pro-resolving lipid mediators, and stem cell therapy, have been tested to increase the success rate of treatment for apical periodontitis. Some of these approaches remain in the in vivo phase of research, while others have just entered the translational research phase to validate clinical application. However, a detailed understanding of the molecular mechanisms that occur during development of the immunoinflammatory reaction in apical periodontitis remains unclear. The aim of this review was to summarize advanced approaches for the treatment of apical periodontitis. Further research can confirm the potential of these alternative nonsurgical endodontic treatment approaches.

DOI： 10.3390/bioengineering10040488

Personalized Preclinical Training in Dental Ergonomics and Endodontics in Undergraduate Dentistry Students (Pilot Study). Reviewed

Zulema Arias, Stephanie Haines, Tadashi Yamamoto, Kazu Hatanaka, Keisuke Yamashiro, Norihiro Sonoi, Shogo Takashiba

Acta medica Okayama 77 ( 2 ) 147 - 159 2023.4

Authorship：Last author Language：English Publishing type：Research paper (scientific journal)

The curriculum at the Department of Pathophysiology in the Periodontal Sciences program at Okayama University includes normative preclinical training (NPT) using phantoms. NPT is given to the whole class of 5 th year students divided in groups of 8 students/instructor. In 2019, an innovative personalized preclinical training (PPT) pilot study was implemented for this group of students whereby two students, each with their own dental unit, were coached by one instructor. The main topics covered were dental ergonomics and endodontics. We aimed to evaluate the effectiveness of PPT in dental ergonomics and endodontics toward increasing the knowledge and future clinical skills of students who had already undergone NPT. A test on endodontics was taken before and after PPT. A questionnaire was completed to assess their perception of improvement regarding the above-mentioned topics. Test scores and questionnaire results both showed that the students' level of knowledge and awareness of future clinical skills was significantly higher after PPT. This pilot study demonstrated that PPT increased the students' knowledge and future clinical skills. As preclinical training forms the foundation for clinical practice, investment in future research regarding this personalized approach is likely to enhance students' understanding and clinical performance.

DOI： 10.18926/AMO/65144

The Fungal Metabolite (+)-Terrein Abrogates Inflammatory Bone Resorption via the Suppression of TNF-α Production in a Ligature-Induced Periodontitis Mouse Model Reviewed

Hidefumi Sako, Kazuhiro Omori, Masaaki Nakayama, Hiroki Mandai, Hidetaka Ideguchi, Saki Yoshimura-Nakagawa, Kyosuke Sakaida, Chiaki Nagata-Kamei, Hiroya Kobayashi, Satoki Ishii, Mitsuaki Ono, Soichiro Ibaragi, Tadashi Yamamoto, Seiji Suga, Shogo Takashiba

Journal of Fungi 9 ( 3 ) 314 - 314 2023.3

Authorship：Last author Publishing type：Research paper (scientific journal) Publisher：MDPI AG

Current periodontal treatment focuses on the mechanical removal of the source of infection, such as bacteria and their products, and there is no approach to control the host inflammatory response that leads to tissue destruction. In order to control periodontal inflammation, we have previously reported the optimization of (+)-terrein synthesis methods and the inhibitory effect of (+)-terrein on osteoclast differentiation in vitro. However, the pharmacological effect of (+)-terrein in vivo in the periodontitis model is still unknown. In this study, we investigated the effect of synthetic (+)-terrein on inflammatory bone resorption using a ligature-induced periodontitis mouse model. Synthetic (+)-terrein (30 mg/kg) was administered intraperitoneally twice a week to the mouse periodontitis model. The control group was treated with phosphate buffer. One to two weeks after the induction of periodontitis, the periodontal tissues were harvested for radiological evaluation (micro-CT), histological evaluation (HE staining and TRAP staining), and the evaluation of inflammatory cytokine production in the periodontal tissues and serum (quantitative reverse-transcription PCR, ELISA). The synthetic (+)-terrein-treated group suppressed alveolar bone resorption and the number of osteoclasts in the periodontal tissues compared to the control group (p < 0.05). In addition, synthetic (+)-terrein significantly suppressed both mRNA expression of TNF-α in the periodontal tissues and the serum concentration of TNF-α (both p < 0.05). In conclusion, we have demonstrated that synthetic (+)-terrein abrogates alveolar bone resorption via the suppression of TNF-α production and osteoclast differentiation in vivo. Therefore, we could expect potential clinical effects when using (+)-terrein on inflammatory bone resorption, including periodontitis.

DOI： 10.3390/jof9030314

Autophagy as a potential mechanism underlying the biological effect of 1,25-Dihydroxyvitamin D3 on periodontitis: a narrative review. Reviewed International journal

Xiaoting Chen, Zulema Arias, Kazuhiro Omori, Tadashi Yamamoto, Yuki Shinoda-Ito, Shogo Takashiba

BMC oral health 23 ( 1 ) 90 - 90 2023.2

Authorship：Last author,　Corresponding author Language：English Publishing type：Research paper (scientific journal)

The major active form of vitamin D, 1,25-dihydroxyvitamin D3 (1,25D3), is known for its wide bioactivity in periodontal tissues. Although the exact mechanisms underlying its protective action against periodontitis remain unclear, recent studies have shown that 1,25D3 regulates autophagy. Autophagy is vital for intracellular pathogen invasion control, inflammation regulation, and bone metabolic balance in periodontal tissue homeostasis, and its regulation could be an interesting pathway for future periodontal studies. Since vitamin D deficiency is a worldwide health problem, its role as a potential regulator of autophagy provides new insights into periodontal diseases. Based on this premise, this narrative literature review aimed to investigate the possible connection between 1,25D3 and autophagy in periodontitis. A comprehensive literature search was conducted on PubMed using the following keywords (e.g., vitamin D, autophagy, periodontitis, pathogens, epithelial cells, immunity, inflammation, and bone loss). In this review, the latest studies on the protective action of 1,25D3 against periodontitis and the regulation of autophagy by 1,25D3 are summarized, and the potential role of 1,25D3-activated autophagy in the pathogenesis of periodontitis is analyzed. 1,25D3 can exert a protective effect against periodontitis through different signaling pathways in the pathogenesis of periodontitis, and at least part of this regulatory effect is achieved through the activation of the autophagic response. This review will help clarify the relationship between 1,25D3 and autophagy in the homeostasis of periodontal tissues and provide perspectives for researchers to optimize prevention and treatment strategies in the future.

DOI： 10.1186/s12903-023-02802-9

A case report of bacteremia caused by dental endodontic treatment in a patient with single ventricle Reviewed

Kazuhiro Omori, Norihisa Toh, Hidetaka Ideguchi, Kentaro Okamoto, Hidefumi Sako, Kanako Kodam, Tadashi Yamamoto, Teiji Akagi, Shingo Kasahara, Hiroshi Ito, Shogo Takashib

12 ( 2 ) 1 - 8 2023.2

Periodontal diseases assessed by average bone resorption are associated with microvascular complications in patients with type 2 diabetes. Reviewed

Noriko Sugi, Eri Eguchi, Ayaka Tsuboi, Kazu Hatanaka, Shogo Takashiba, Yuri Kira, Masako Miura, Keiki Ogino, Keita Hirano, Takahiko Nakagawa, Kentaro Doi

Diabetology international 14 ( 1 ) 32 - 39 2023.1

Language：English Publishing type：Research paper (scientific journal)

UNLABELLED: Periodontal disease often develops in patients with diabetes, and further exacerbated with diabetic complications. It would be clinically important to clarify the relationship between diabetic microvascular diseases and periodontal disease. This study aimed to evaluate the association between periodontal disease and diabetic complications in patients with type 2 diabetes with poor glycemic control. A total of 447 patients with type 2 diabetes hospitalized at Rakuwakai Otowa Hospital, Japan, were initially recruited in this study. After excluding 134 patients who lacked clinical data or were edentulous, 312 were included in our study. The severity of periodontal disease was evaluated based on the average bone resorption rate. Patients with diabetic nephropathy developed severe periodontal disease (multivariate-adjusted odds ratio, 3.00 [95% CI 1.41-5.19]). Diabetic neuropathy was positively associated with the severity of periodontal disease; the multivariate-adjusted odds ratio (95% CI) was 1.62 (0.87‒2.99) for moderate and 4.26 (2.21‒8.20) for severe periodontal disease. In contrast, diabetic retinopathy was linked with moderate periodontal disease (multivariate-adjusted odds ratio 2.23 [95% CI 1.10-4.10]), but not with severe conditions (multivariate-adjusted odds ratio 0.92 [95% CI 0.67-3.07]). In conclusion, periodontal disease, evaluated by average bone resorption rate, was associated with diabetic nephropathy and neuropathy. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1007/s13340-022-00591-0.

DOI： 10.1007/s13340-022-00591-0

Reattachment of Fractured Tooth Fragment by Multidisciplinary Treatment Approach Reviewed

Zulema Arias, Heber Falú Hinojosa Ledezma, Claudia Patricia Osorio Terán, Kazuhiro Omori, Tadashi Yamamoto, Mohammed Zahedul Islam Nizami, Shogo Takashiba

The Bulletin of Tokyo Dental College 2023

Graphene Oxide-based Endodontic Sealer: An in Vitro Study. Reviewed

Mohammed Zahedul Islam Nizami, Melahat Gorduysus, Yuki Shinoda-Ito, Tadashi Yamamoto, Yuta Nishina, Shogo Takashiba, Zulema Arias

Acta medica Okayama 76 ( 6 ) 715 - 721 2022.12

Language：English Publishing type：Research paper (scientific journal)

The failure of endodontic treatment is directly associated with microbial infection in the root canal or periapical areas. An endodontic sealer that is both bactericidal and biocompatible is essential for the success of root canal treatments. This is one of the vital issues yet to be solved in clinical dental practice. This in vitro study assessed the effectiveness of graphene oxide (GO) composites GO-CaF2 and GO-Ag-CaF2 as endodontic sealer materials. Dentin slices were coated with either the GO-based composites or commonly used root canal sealers (non-eugenol zinc oxide sealer). The coated slices were treated in 0.9% NaCl, phosphate-buffered saline (PBS), and simulated body fluid (SBF) at 37˚C for 24 hours to compare their sealing effect on the dentin surface. In addition, the radiopacity of these composites was examined to assess whether they complied with the requirements of a sealer for good radiographic visualization. Scanning electron microscopy showed the significant sealing capability of the composites as coating materials. Radiographic images confirmed their radiopacity. Mineral deposition indicated their bioactivity, especially of GO-Ag-CaF2, and thus it is potential for regenerative application. They were both previously shown to be bactericidal to oral microbes and cytocompatible with host cells. With such a unique assemblage of critical properties, these GO-based composites show promise as endodontic sealers for protection against reinfection in root canal treatment and enhanced success in endodontic treatment overall.

DOI： 10.18926/AMO/64122

Periodontal Treatment and Usual Care for Nonalcoholic Fatty Liver Disease: A Multicenter, Randomized Controlled Trial. Reviewed International journal

Yohei Kamata, Takaomi Kessoku, Tomoko Shimizu, Satsuki Sato, Takashi Kobayashi, Takeo Kurihashi, Toshiya Morozumi, Tomoyuki Iwasaki, Shogo Takashiba, Kazu Hatanaka, Nobushiro Hamada, Toshiro Kodama, Takuma Higurashi, Masataka Taguri, Masato Yoneda, Haruki Usuda, Koichiro Wada, Atsushi Nakajima, Masato Minabe

Clinical and translational gastroenterology 13 ( 11 ) e00520 2022.11

Language：English Publishing type：Research paper (scientific journal)

BACKGROUND: Periodontal disease is associated with non-alcoholic fatty liver disease (NAFLD). We evaluated periodontal treatment efficacy in patients with NAFLD and periodontal disease. METHODS: This multicenter, 2-arm, randomized study recruited adult patients with NAFLD and periodontitis, alanine aminotransferase levels ≥40 U/L, and equivalent steatosis grade ≥1. Forty eligible patients (18 men and 22 women) were randomly assigned to 2 groups (scaling and root planning [SRP; n = 20] and tooth-brushing [n = 20] groups) stratified by age and sex. The primary and secondary endpoints were changes in alanine aminotransferase levels and serum Porphyromonas gingivalis IgG-antibody titers from baseline to 12 weeks, respectively. Efficacy analysis was performed using an intention-to-treat approach (t-test). This trial was registered with the University Hospital Medical Information Network Clinical Trials Registry (UMINXXXXXXX). RESULTS: We observed a significantly higher decrease in absolute alanine aminotransferase levels and P. gingivalis IgG-antibody titers in the SRP group than in the tooth-brushing group (-12 vs 1 U/L; mean difference [δ], -12; 95% confidence interval [CI], -20 to -5; P = 0.002). The decrease in P. gingivalis IgG-antibody titer was significantly higher in the SRP group than in the tooth-brushing group (FDC381, -1.6 [2.5]; δ, -1.6; 95% CI, -2.7 to -0.4; P = 0.0092; SU63, -1.7 [2.0]; δ, -1.7; 95% CI, -2.7 to -0.7). No life-threatening events or treatment-related deaths occurred. CONCLUSION: Periodontal treatment induced significant short- and mid-term reductions in liver enzyme levels and antibody titers. Further research is warranted to clearly define SRP efficacy and tolerability in patients with NAFLD and periodontitis.

DOI： 10.14309/ctg.0000000000000520

A cross-sectional study assessing the relationship between non-alcoholic fatty liver disease and periodontal disease Reviewed

Satsuki Sato, Yohei Kamata, Takaomi Kessoku, Tomoko Shimizu, Takashi Kobayashi, Takeo Kurihashi, Shogo Takashiba, Kazu Hatanaka, Nobushiro Hamada, Toshiro Kodama, Takuma Higurashi, Masataka Taguri, Masato Yoneda, Haruki Usuda, Koichiro Wada, Atsushi Nakajima, Toshiya Morozumi, Masato Minabe

Scientific Reports 12 ( 1 ) 2022.8

Publishing type：Research paper (scientific journal) Publisher：Springer Science and Business Media LLC

Abstract

The risk factors for non-alcoholic fatty liver disease (NAFLD) progression are not completely known. Porphyromonasgingivalis infection is a risk factor for systemic diseases. We investigated the association of P.gingivalis infection with the risk of non-alcoholic steatohepatitis progression. Here, hematological tests, periodontal examination, and saliva collection were performed for 164 patients with NAFLD. P.gingivalis was identified in saliva using polymerase chain reaction. Hepatic steatosis and stiffness were evaluated using vibration-controlled transient elastography (VCTE) and magnetic resonance imaging. In patients with NAFLD, P.gingivalis positivity (P.gingivalis ratio ≥ 0.01%) in saliva correlated with liver stiffness determined using magnetic resonance elastography (MRE; p < 0.0001). A P.gingivalis ratio of 0.01% corresponds to 100,000 cells/mL and indicates the proportion of P.gingivalis in the total number of bacteria in the oral cavity. Patients with NAFLD and advanced fibrosis on MRE showed significantly elevated endotoxin activity; those who had > 10 periodontal pockets with depths ≥ 4 mm had significantly increased hepatic stiffness on both VCTE and MRE.

DOI： 10.1038/s41598-022-17917-2

Other Link： https://www.nature.com/articles/s41598-022-17917-2

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