Faculty Profiles - TAKASHIBA Shogo

Papers - TAKASHIBA Shogo

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Treatment resistance of rheumatoid arthritis relates to infection of periodontal pathogenic bacteria: a case-control cross-sectional study. Reviewed International journal

Kazu Takeuchi-Hatanaka, Yoshinobu Koyama, Kentaro Okamoto, Kyosuke Sakaida, Tadashi Yamamoto, Shogo Takashiba

Scientific reports 12 ( 1 ) 12353 - 12353 2022.7

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

Recent studies have shown that periodontitis is associated with rheumatoid arthritis (RA) and periodontal bacteria, such as Aggregatibacter actinomycetemcomitans (Aa) and Porphyromonas gingivalis (Pg) are involved in the pathogenesis of RA via citrullinated proteins. Smoking has also been shown to be involved in the pathogenesis of RA; however, the extent of this involvement is still poorly understood. In addition, RA and polymyalgia rheumatica (PMR) are sometimes difficult to differentiate; however, the relationship between PMR and the factors from smoking and periodontal bacteria is unclear. The aim of this study was to clarify the relationship between periodontal pathogenic bacterial infections and smoking in patients with RA or PMR. This case-control study included 142 patients with untreated RA or PMR. This study evaluated the serum antibody titers against periodontal pathogenic bacterial antigens and an anti-citrullinated peptide antibody (ACPA). In patients with RA, the relationship between antibody titers and disease activity of RA and response after 3 months of treatment was also investigated. Additionally, the effects of smoking were evaluated. Although there was no significant difference in serum antibody titer against periodontal pathogenic bacteria between the ACPA-positive RA group and the ACPA-negative PMR group, we found an association between the elevated antibody titer against Pg and the degree of ACPA value, especially between negative group and high-value positive group (≥ 100 U/mL). The antibody titers against Aa and Pg did not differ depending on disease activity score 28 (DAS28) at baseline; however, patients with high antibody titers had poor RA therapeutic response as judged by DAS28 after 3 months. We could not find any association between smoking and any of these parameters. Periodontal pathogenic bacteria, especially Pg, are associated with elevated ACPA levels. Our findings suggest that Pg and Aa infections interfere with the therapeutic response of RA.

DOI： 10.1038/s41598-022-16279-z

HMGB1はマクロファージをM1タイプに極性化させて歯周炎の進行に影響を及ぼす

平井杏奈, 井手口英隆, 山城圭介, 青柳浩明, 山本直史, 高柴正悟

日本歯周病学会会誌 64 ( 春季特別 ) 114 - 114 2022.5

Analysis of subgingival microbiota in monozygotic twins with different severity and progression risk of periodontitis. Reviewed International journal

Tadashi Yamamoto, Makoto Taniguchi, Kazuyuki Matsunaga, Yusuke Kawata, Mari Kawamura, Keisuke Okubo, Keisuke Yamashiro, Kazuhiro Omori, Shogo Takashiba

Clinical case reports 10 ( 4 ) e05725 2022.4

Authorship：Last author Language：English

The study aims to reveal the composition of subgingival bacteria in monozygotic twins with discordant in severity and progression risk of periodontitis. Microbiome analysis indicated that most bacteria were heritable but differed in their abundance and immune response. The dysbiotic bacteria can be considered as risk markers for periodontitis progression.

DOI： 10.1002/ccr3.5725

Estimation of periodontal pocket surface area in small to medium dogs: a proof-of-concept study. Reviewed International journal

Kazuya Tamura, Masako Tokuzen-Tai, Yasir Dilshad Siddiqui, Hitomi Tamura-Naito, Yoshiharu Nagahara, Kazu Hatanaka-Takeuchi, Tadashi Yamamoto, Shogo Takashiba

BMC veterinary research 18 ( 1 ) 13 - 13 2022.1

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

BACKGROUND: Periodontal disease is the most common dental disease in dogs. Although the systemic effects of periodontal disease have not been clarified in veterinary science, it is necessary to evaluate the effects of periodontal disease in clinical trials in the future. There have been a few clinical attempts made, however, to assess the severity of periodontal inflammation and its impact on the systemic health of dogs. Meanwhile, in the field of dentistry for humans, the periodontal inflamed surface area (PISA) and periodontal epithelial surface area (PESA) have been used to quantitatively assess the degree of periodontal disease affecting a single tooth as well as the overall extent of periodontitis. Recent studies have also suggested the use of these assessments to examine the relationship between periodontal inflammation and systemic health. RESULTS: The estimation formula for a dog's periodontal pocket surface area (PPSA), an alternative to PISA and PESA in humans, was established using body weight and periodontal pocket depth. Actual values were measured using extracted teeth from various dog breeds and sizes (2.3-25.0 kg of body weight) to obtain universal regression equations for PPSA. Altogether, 625 teeth from 73 dogs of 16 breeds were extracted and subsequently analyzed for morphological information. PPSA was measured in 61 dogs of 10 breeds with periodontal disease using the established estimation formulas, and the correlation between PPSA and preoperative blood chemistry data was analyzed accordingly. A strong correlation was found between PPSA and serum globulin (r = 0.71) while moderate correlations were found for C-reactive protein (r = 0.54) and serum albumin (r = -0.51). CONCLUSIONS: Estimation formulas using body weight and the 6-point probing depth were established for determining PPSA. Direct correlations between PPSA and several blood test results were observed in the study sample. Taken together, these results suggest that PPSA could be useful for evaluating the effects of periodontitis on systemic conditions in dogs.

DOI： 10.1186/s12917-021-03116-0

Enzymatic measurement of short-chain fatty acids and application in periodontal disease diagnosis. Reviewed International journal

Kazu Hatanaka, Yasushi Shirahase, Toshiyuki Yoshida, Mari Kono, Naoki Toya, Shin-Ichi Sakasegawa, Kenji Konishi, Tadashi Yamamoto, Kuniyasu Ochiai, Shogo Takashiba

PloS one 17 ( 7 ) e0268671 2022

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

Periodontal disease is a chronic inflammatory condition caused by periodontal pathogens in the gingival sulcus. Short-chain fatty acids (SCFAs) produced by causal bacteria are closely related to the onset and progression of periodontal disease and have been reported to proliferate in the periodontal sulcus of patients experiencing this pathology. In such patients, propionic acid (C3), butyric acid (C4), isobutyric acid (IC4), valeric acid (C5), isovaleric acid (IC5), and caproic acid (C6), henceforth referred to as [C3-C6], has been reported to have a detrimental effect, while acetic acid (C2) exhibits no detrimental effect. In this study, we established an inexpensive and simple enzymatic assay that can fractionate and measure these acids. The possibility of applying this technique to determine the severity of periodontal disease by adapting it to specimens collected from humans has been explored. We established an enzyme system using acetate kinase and butyrate kinase capable of measuring SCFAs in two fractions, C2 and [C3-C6]. The gingival crevicular fluid (GCF) and saliva of 10 healthy participants and 10 participants with mild and severe periodontal disease were measured using the established enzymatic method and conventional gas chromatography-mass spectrometry (GC-MS). The quantification of C2 and [C3-C6] in human GCF and saliva was well correlated when using the GC-MS method. Furthermore, both C2 and [C3-C6] in the GCF increased with disease severity. However, while no significant difference was observed between healthy participants and periodontal patients when using saliva, [C3-C6] significantly differed between mild and severe periodontal disease. The enzymatic method was able to measure C2 and [C3-C6] separately as well as using the GC-MS method. Furthermore, the C2 and [C3-C6] fractions of GCF correlated with disease severity, suggesting that this method can be applied clinically. In contrast, the quantification of C2 and [C3-C6] in saliva did not differ significantly between healthy participants and patients with periodontal disease. Future studies should focus on inflammation rather than on tissue destruction.

DOI： 10.1371/journal.pone.0268671

Use of Highly Accurate Devices for a First Lower Premolar Endodontic Treatment with Multiple Root Canals. Reviewed International coauthorship

Zulema Arias Martinez, Jorge Lopez Videla, Keisuke Yamashiro, Yuki Shinoda-Ito, Tadashi Yamamoto, Shogo Takashiba

Acta medica Okayama 75 ( 5 ) 641 - 645 2021.10

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

This case report highlights the importance of using a dental operating microscope (DOM) and ultrasonic endodontic tips (UETs) to locate all root canals in the lower first premolar. A 53-year-old woman presented to our clinic with pain in the lower right first premolar. After a detailed search using a DOM and UETs, three root canals were found, prepared with rotary HyFlex endodontic files, and obturated using the lateral condensation technique. At the five-year follow-up after treatment, the tooth was completely restored and fulfilling its function, with no signs or symptoms of any post-treatment flare-up.

DOI： 10.18926/AMO/62778

Malnutrition delayed wound healing after tooth extraction by HMGB1-related prolonged inflammation. Reviewed International journal

Yao Zhang, Hidetaka Ideguchi, Hiroaki Aoyagi, Keisuke Yamashiro, Tadashi Yamamoto, Masahiro Nishibori, Shogo Takashiba

International immunopharmacology 96 107772 - 107772 2021.7

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

Malnutrition causes prolonged inflammation, resulting in delayed wound healing. High mobility group box-1 (HMGB1) is a damage-associated molecular pattern that is present in the nuclei of macrophages and is secreted into the extracellular milieu in response to stimuli. It stimulates the production of interleukin-1β (IL-1β) through the receptors for advanced glycation end products (RAGE), inducing an inflammatory response, which is an essential response to initiate wound healing. We hypothesized that malnutrition may interfere with this cascade, causing abnormal inflammation and ultimately delaying wound healing. We used tooth-extracted mice with malnutrition fed with low-casein diet for two weeks. On days 3 and 7 after tooth extraction, the wound tissue was histologically observed and analyzed for several factors in the inflammation-regeneration lineage, including IL-1β, mesenchymal stem cells, myeloperoxidase activity, HMGB1, macrophage polarization, and adenosine 5-triphosphate (ATP). On day 7, delayed wound healing was observed with the following findings under malnutrition conditions: decreased mRNA expression of genes for regeneration and mesenchymal stem cell (MSC) accumulation, an obvious increase in myeloperoxidase and IL-1β mRNA expression, an increase in HMGB1 levels, and an increase in ATP concentration in tissues with elevated proportion of M2 macrophages. These results suggest that the significantly increased secretion of HMGB1 associated with the upregulated production of ATP and IL-1β secretion via the RAGE pathway may interfere with the resolution of inflammation and wound healing under the state of malnutrition.

DOI： 10.1016/j.intimp.2021.107772

The Fungal Metabolite (+)-Terrein Abrogates Ovariectomy-Induced Bone Loss and Receptor Activator of Nuclear Factor-κB Ligand-Induced Osteoclastogenesis by Suppressing Protein Kinase-C α/βII Phosphorylation. Reviewed International journal

Kyosuke Sakaida, Kazuhiro Omori, Masaaki Nakayama, Hiroki Mandai, Saki Nakagawa, Hidefumi Sako, Chiaki Kamei, Satoshi Yamamoto, Hiroya Kobayashi, Satoki Ishii, Mitsuaki Ono, Soichiro Ibaragi, Keisuke Yamashiro, Tadashi Yamamoto, Seiji Suga, Shogo Takashiba

Frontiers in pharmacology 12 674366 - 674366 2021.6

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

Osteoporosis is a common disease characterized by a systemic impairment of bone mass and microarchitecture that results in fragility fractures. Severe bone loss due to osteoporosis triggers pathological fractures and consequently decreases the daily life activity and quality of life. Therefore, prevention of osteoporosis has become an important issue to be addressed. We have reported that the fungal secondary metabolite (+)-terrein (TER), a natural compound derived from Aspergillus terreus, has shown receptor activator of nuclear factor-κB ligand (RANKL)-induced osteoclast differentiation by suppressing nuclear factor of activated T-cell 1 (NFATc1) expression, a master regulator of osteoclastogenesis. TER has been shown to possess extensive biological and pharmacological benefits; however, its effects on bone metabolism remain unclear. In this study, we investigated the effects of TER on the femoral bone metabolism using a mouse-ovariectomized osteoporosis model (OVX mice) and then on RANKL signal transduction using mouse bone marrow macrophages (mBMMs). In vivo administration of TER significantly improved bone density, bone mass, and trabecular number in OVX mice (p < 0.01). In addition, TER suppressed TRAP and cathepsin-K expression in the tissue sections of OVX mice (p < 0.01). In an in vitro study, TER suppressed RANKL-induced phosphorylation of PKCα/βII, which is involved in the expression of NFATc1 (p < 0.05). The PKC inhibitor, GF109203X, also inhibited RANKL-induced osteoclastogenesis in mBMMs as well as TER. In addition, TER suppressed the expression of osteoclastogenesis-related genes, such as Ocstamp, Dcstamp, Calcr, Atp6v0d2, Oscar, and Itgb3 (p < 0.01). These results provide promising evidence for the potential therapeutic application of TER as a novel treatment compound against osteoporosis.

DOI： 10.3389/fphar.2021.674366

Association between Psychosocial Factors and Oral Symptoms among Residents in Fukushima after the Great East Japan Earthquake: A Cross-Sectional Study from the Fukushima Health Management Survey. Reviewed International journal

Narumi Funakubo, Ayaka Tsuboi, Eri Eguchi, Fumikazu Hayashi, Masaharu Maeda, Hirooki Yabe, Seiji Yasumura, Kenji Kamiya, Shogo Takashiba, Tetsuya Ohira, Mental Health Group Of The Fukushima Health Management Survey

International journal of environmental research and public health 18 ( 11 ) 2021.6

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

Oral health is closely related to subjective general health and systemic diseases. This cross-sectional study aimed to identify the factors related to oral symptoms and their worsening in relation to psychosocial factors after the Great East Japan Earthquake. In this study, 64,186 residents aged 15-101 years old, who experienced the earthquake on 11 March 2011, were surveyed regarding their oral symptoms; psychological factors, such as post-traumatic reactions and psychological distress; and social factors such as evacuation, work change, and loss of a close person; history of systemic diseases; and lifestyle. Binomial logistic regression analysis was used to calculate odds ratios, and 95% confidence intervals were established for each factor associated with prevalent and exacerbated oral symptoms. The proportions of participants with prevalent and exacerbated oral symptoms were 10.3% and 1.6%, respectively. The multivariate odds ratios and 95% CI of psychosocial factors associated with exacerbated oral symptoms were as follows: post-traumatic stress disorder symptoms, 2.24 (1.64-3.06); work changes, 1.88 (1.34-2.65); history of dyslipidemia, 1.74 (1.27-2.39); and subjective current poor health condition, 2.73 (2.00-3.75). Psychological factors, social factors, and physical factors were associated with both prevalent and exacerbated oral symptoms.

DOI： 10.3390/ijerph18116054

Prospective Longitudinal Changes in the Periodontal Inflamed Surface Area Following Active Periodontal Treatment for Chronic Periodontitis. Reviewed International journal

Yoshiaki Nomura, Toshiya Morozumi, Atsushi Saito, Atsutoshi Yoshimura, Erika Kakuta, Fumihiko Suzuki, Fusanori Nishimura, Hideki Takai, Hiroaki Kobayashi, Kazuyuki Noguchi, Keiso Takahashi, Koichi Tabeta, Makoto Umeda, Masato Minabe, Mitsuo Fukuda, Naoyuki Sugano, Nobuhiro Hanada, Nobuo Yoshinari, Satoshi Sekino, Shogo Takashiba, Soh Sato, Toshiaki Nakamura, Tsutomu Sugaya, Yohei Nakayama, Yorimasa Ogata, Yukihiro Numabe, Taneaki Nakagawa

Journal of clinical medicine 10 ( 6 ) 2021.3

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

Periodontal disease is a chronic inflammatory disease of the periodontal tissue. The periodontal inflamed surface area (PISA) is a proposed index for quantifying the inflammatory burden resulting from periodontitis lesions. This study aimed to investigate longitudinal changes in the periodontal status as evaluated by the PISA following the active periodontal treatment. To elucidate the prognostic factors of PISA, mixed-effect modeling was performed for clinical parameters, tooth-type, and levels of periodontal pathogens as independent variables. One-hundred-twenty-five patients with chronic periodontitis who completed the active periodontal treatment were followed-up for 24 months, with evaluations conducted at 6-month intervals. Five-times repeated measures of mean PISA values were 130+/-173, 161+/-276, 184+/-320, 175+/-417, and 209+/-469 mm2. Changes in clinical parameters and salivary and subgingival periodontal pathogens were analyzed by mixed-effect modeling. Plaque index, clinical attachment level, and salivary levels of Porphyromonas gingivalis were associated with changes in PISA at the patient- and tooth-level. Subgingival levels of P. gingivalis and Prevotella intermedia were associated with changes in PISA at the sample site. For most patients, changes in PISA were within 10% of baseline during the 24-month follow-up. However, an increase in the number of bleeding sites in a tooth with a deep periodontal pocket increased the PISA value exponentially.

DOI： 10.3390/jcm10061165

Estimation of the Periodontal Inflamed Surface Area by Simple Oral Examination. Reviewed International journal

Yoshiaki Nomura, Toshiya Morozumi, Yukihiro Numabe, Yorimasa Ogata, Yohei Nakayama, Tsutomu Sugaya, Toshiaki Nakamura, Soh Sato, Shogo Takashiba, Satoshi Sekino, Nobuo Yoshinari, Nobuhiro Hanada, Naoyuki Sugano, Mitsuo Fukuda, Masato Minabe, Makoto Umeda, Koichi Tabeta, Keiso Takahashi, Kazuyuki Noguchi, Hiroaki Kobayashi, Hideki Takai, Fusanori Nishimura, Fumihiko Suzuki, Erika Kakuta, Atsutoshi Yoshimura, Atsushi Saito, Taneaki Nakagawa

Journal of clinical medicine 10 ( 4 ) 2021.2

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

The periodontal inflamed surface area (PISA) is a useful index for clinical and epidemiological assessments, since it can represent the inflammation status of patients in one contentious variable. However, calculation of the PISA is difficult, requiring six point probing depth measurements with or without bleeding on probing on 28 teeth, followed by data input in a calculation program. More simple methods are essential for screening periodontal disease or in epidemiological studies. In this study, we tried to establish a convenient partial examination method to estimate PISA. Cross-sectional data of 254 subjects who completed active periodontal therapy were analyzed. Teeth that represent the PISA value were selected by an item response theory approach. The maxillary second molar, first premolar, and lateral incisor and the mandibular second molar and lateral incisor were selected. The sum of the PISAs of these teeth was significantly correlated with the patient's PISA (R2 = 0.938). More simply, the sum of the maximum values of probing pocket depth with bleeding for these teeth were also significantly correlated with the patient's PISA (R2 = 0.6457). The simple model presented in this study may be useful to estimate PISA.

DOI： 10.3390/jcm10040723

Microbiome composition comparison in oral and atherosclerotic plaque from patients with and without periodontitis. Reviewed International journal

Daichi Isoshima, Keisuke Yamashiro, Kazuyuki Matsunaga, Makoto Taniguchi, Takehiro Matsubara, Shuta Tomida, Shinzo Ota, Michiyoshi Sato, Yutaka Shimoe, Tatsuo Kohriyama, Zulema Arias, Kazuhiro Omori, Tadashi Yamamoto, Shogo Takashiba

Odontology 109 ( 1 ) 239 - 249 2021.1

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

There is no conclusive evidence regarding a causal relationship between periodontitis and atherosclerosis. In this study, we examined the microbiome in the oral cavity and atheromatous plaques from atherosclerosis patients with or without periodontitis to investigate the role of oral bacteria in the formation of atheromatous plaques. We chose four patients with and without periodontitis, who had undergone carotid endarterectomy. Bacterial samples were extracted from the tongue surface, from periodontal pocket (during the oral examination), and from the atheromatous plaques (APs). We investigated the general and oral conditions from each patient and performed next-generation sequencing (NGS) analysis for all bacterial samples. There were no significant differences between both groups concerning general conditions. However, the microbiome patterns of the gingival pocket showed differences depending on the absence or presence of periodontitis, while those of the tongue surface were relatively similar. The microbiome pattern of the atheromatous plaques was entirely different from that on the tongue surface and gingival pocket, and oral bacteria were seldom detected. However, the microbiome pattern in atheromatous plaques was different in the presence or absence of periodontitis. These results suggested that oral bacteria did not affect the formation of atheromatous plaques directly.

DOI： 10.1007/s10266-020-00524-w

Allergic Reaction to Zirconia Ceramic Bridge Cementation Using a Dental Adhesive Resin Cement: a Case Report Reviewed International journal

Keisuke Yamashiro, Haruna Miki, Masae Kitagawa, Hiroko Oka, Zulema Arias, Shogo Takashiba

SN Comprehensive Clinical Medicine 3 ( 1 ) 327 - 330 2021.1

Optimal Examination Sites for Periodontal Disease Evaluation: Applying the Item Response Theory Graded Response Model. Reviewed International journal

Yoshiaki Nomura, Toshiya Morozumi, Mitsuo Fukuda, Nobuhiro Hanada, Erika Kakuta, Hiroaki Kobayashi, Masato Minabe, Toshiaki Nakamura, Yohei Nakayama, Fusanori Nishimura, Kazuyuki Noguchi, Yukihiro Numabe, Yorimasa Ogata, Atsushi Saito, Soh Sato, Satoshi Sekino, Naoyuki Sugano, Tsutomu Sugaya, Fumihiko Suzuki, Keiso Takahashi, Hideki Takai, Shogo Takashiba, Makoto Umeda, Hiromasa Yoshie, Atsutoshi Yoshimura, Nobuo Yoshinari, Taneaki Nakagawa

Journal of clinical medicine 9 ( 11 ) 2020.11

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

Periodontal examination data have a complex structure. For epidemiological studies, mass screenings, and public health use, a simple index that represents the periodontal condition is necessary. Periodontal indices for partial examination of selected teeth have been developed. However, the selected teeth vary between indices, and a justification for the selection of examination teeth has not been presented. We applied a graded response model based on the item response theory to select optimal examination teeth and sites that represent periodontal conditions. Data were obtained from 254 patients who participated in a multicenter follow-up study. Baseline data were obtained from initial follow-up. Optimal examination sites were selected using item information calculated by graded response modeling. Twelve sites-maxillary 2nd premolar (palatal-medial), 1st premolar (palatal-distal), canine (palatal-medial), lateral incisor (palatal-central), central incisor (palatal-distal) and mandibular 1st premolar (lingual, medial)-were selected. Mean values for clinical attachment level, probing pocket depth, and bleeding on probing by full mouth examinations were used for objective variables. Measuring the clinical parameters of these sites can predict the results of full mouth examination. For calculating the periodontal index by partial oral examination, a justification for the selection of examination sites is essential. This study presents an evidence-based partial examination methodology and its modeling.

DOI： 10.3390/jcm9113754

Follistatin expressed in mechanically-damaged salivary glands of male mice induces proliferation of CD49f+ cells. Reviewed International journal

A Ikeda, T Yamamoto, J Mineshiba, S Takashiba

Scientific reports 10 ( 1 ) 19959 - 19959 2020.11

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

Salivary glands (SGs) are very important for maintaining the physiological functions of the mouth. When SGs regenerate and repair from various damages, including mechanical, radiological, and immune diseases, acinar and granular duct cells originate from intercalated duct cells. However, the recovery is often insufficient because of SGs' limited self-repair function. Furthermore, the precise repair mechanism has been unclear. Here, we focused on CD49f, one of the putative stem cell markers, and characterized CD49f positive cells (CD49f+ cells) isolated from male murine SGs. CD49f+ cells possess self-renewal ability and express epithelial and pluripotent markers. Compared to CD49f negative cells, freshly isolated CD49f+ cells highly expressed inhibin beta A and beta B, which are components of activin that has anti-proliferative effects. Notably, an inhibitor of activin, follistatin was expressed in mechanically-damaged SGs, meanwhile no follistatin was expressed in normal SGs in vivo. Moreover, sub-cultured CD49f+ cells highly expressed both Follistatin and a series of proliferative genes, expressions of which were decreased by Follistatin siRNA. These findings indicated that the molecular interaction between activin and follistatin may induce CD49f+ cells proliferation in the regeneration and repair of mouse SGs.

DOI： 10.1038/s41598-020-77004-2

歯周組織の炎症と不妊の関連性を示唆する、ある侵襲性歯周炎患者の病態生理 Reviewed

大森一弘, 河野隆幸, 小林寛也, 新井英雄, 山本直史, 高柴正悟

日本歯科保存学雑誌 63 ( 5 ) 451 - 460 2020.10

Authorship：Last author Language：Japanese Publisher：(NPO)日本歯科保存学会

緒言:歯周病原細菌の感染と歯周組織の炎症が,妊娠に影響を与える可能性が報告されている.今回,不妊治療の経過が思わしくない侵襲性歯周炎患者に感染源除去の観点から専門的歯周治療を行い,自然妊娠から正常出産にいたった症例の経過をふまえ病態を考察する.症例:33歳,女性,既婚(不妊治療中).2016年9月,26の動揺および同部の自発痛を自覚し,かかりつけ歯科医院を受診した.同院でエックス線検査を受けて,重度の歯槽骨吸収があると説明された.早期の専門的歯周治療を勧められ,当科を紹介された.既往歴の特記事項はなく,不妊検査においても患者本人および夫ともに異常所見はなかった.歯周組織検査において,probing pocket depthが4mm以上の部位の割合は49.5%,bleeding on probingは47.9%,plaque control recordは3.1%,歯周炎症表面積(PISA)は2,392mm2であった.エックス線検査所見では,主訴部の26部を中心に根尖に及ぶ骨吸収像が多数存在した.歯周病原細菌に対する血清抗体価検査および歯周ポケット内細菌DNA検査ともに,Porphyromonas gingivalisの感染が強く疑われた.診断は広汎型侵襲性歯周炎(ステージIV,グレードC),二次性咬合性外傷とした.治療方針として,患者の妊娠希望に配慮して,できるかぎり早期(1年以内)の歯周環境の改善を目指すこととした.また,歯周外科治療が終了するまでの不妊治療を含めた妊娠活動を控える必要性について説明し,同意を得た.治療計画は,(1)歯周基本治療(患者教育,抜歯,局所抗菌療法を併用したスケーリング・ルートプレーニング,暫間固定),(2)歯周組織再生療法,(3)口腔機能回復治療,(4)歯周病安定期治療(SPT)とした.治療経過として,歯周治療に対する宿主反応性は非常に良く,炎症改善と歯槽骨の再生を確認した(歯周外科治療後PISA:43mm2).口腔機能回復治療中に自然妊娠し,35歳時に男児を正常出産(経腟分娩,3,240g,出産週数:38週+5日)した.考察および結論:重度のP. gingivalis感染および歯周炎症を伴う侵襲性歯周炎の罹患が,妊娠成立に影響を及ぼす可能性が示唆された.本症例のように不妊治療の経過が思わしくない場合には,歯周組織を含めた口腔状態を一度精査することが望まれる.(著者抄録)

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新しい日本での歯周病治療と歯周病専門医の展開 Reviewed

高柴正悟

日本歯周病学会会誌 62 ( 3 ) 129 - 135 2020.9

Authorship：Lead author,　Corresponding author Language：Japanese Publisher：(NPO)日本歯周病学会

超高齢社会の日本において医療界、特に歯科医療界がどこに向かうのか考察した。大学を含む病院が主な勤務先である医師とは異なり、歯科医師はほとんどが歯科診療所に勤務している。また、厚労省の統計によると歯科医師は医師よりも平均年齢が7歳若く、これは高齢者の割合が増加している患者への対応方法に若干の違いをもたらしている可能性がある。一方で医師と歯科医師の分布の地域差が顕著であり、来たるべき歯科医師の高齢化についても配慮が必要となる。こうした社会の変化の中で、日本歯周病学会の歯周病専門医は厚生労働省の「医療に関する広告が可能となった医師等の専門性に関する資格名」として周知されている。今後は、(一社)日本歯科専門医機構の承認も得ることには違いない。また、高度で広範囲な歯周病専門医による治療を日本国内の各地に均平化することも必要である。

Other Link： https://search.jamas.or.jp/index.php?module=Default&action=Link&pub_year=2020&ichushi_jid=J01095&link_issn=&doc_id=20201009370001&doc_link_id=130007919193&url=https%3A%2F%2Fci.nii.ac.jp%2Fnaid%2F130007919193&type=CiNii&icon=https%3A%2F%2Fjk04.jamas.or.jp%2Ficon%2F00003_1.gif

Simultaneous Determination of 7 Short-Chain Fatty Acids in Human Saliva by High-Sensitivity Gas Chromatography-Mass Spectrometry Reviewed

Shogo Takashiba

Chromatography 41 ( 2 ) 63 - 71 2020.6

The fungal metabolite (+)-terrein abrogates osteoclast differentiation via suppression of the RANKL signaling pathway through NFATc1. Reviewed International journal

Saki Nakagawa, Kazuhiro Omori, Masaaki Nakayama, Hiroki Mandai, Satoshi Yamamoto, Hiroya Kobayashi, Hidefumi Sako, Kyosuke Sakaida, Hiroshi Yoshimura, Satoki Ishii, Soichiro Ibaragi, Kimito Hirai, Keisuke Yamashiro, Tadashi Yamamoto, Seiji Suga, Shogo Takashiba

International immunopharmacology 83 106429 - 106429 2020.6

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

Pathophysiological bone resorption is commonly associated with periodontal disease and involves the excessive resorption of bone matrix by activated osteoclasts. Receptor activator of nuclear factor (NF)-κB ligand (RANKL) signaling pathways have been proposed as targets for inhibiting osteoclast differentiation and bone resorption. The fungal secondary metabolite (+)-terrein is a natural compound derived from Aspergillus terreus that has previously shown anti-interleukin-6 properties related to inflammatory bone resorption. However, its effects and molecular mechanism of action on osteoclastogenesis and bone resorption remain unclear. In the present study, we showed that 10 µM synthetic (+)-terrein inhibited RANKL-induced osteoclast formation and bone resorption in a dose-dependent manner and without cytotoxicity. RANKL-induced messenger RNA expression of osteoclast-specific markers including nuclear factor of activated T-cells cytoplasmic 1 (NFATc1), the master regulator of osteoclastogenesis, cathepsin K, tartrate-resistant acid phosphatase (Trap) was completely inhibited by synthetic (+)-terrein treatment. Furthermore, synthetic (+)-terrein decreased RANKL-induced NFATc1 protein expression. This study revealed that synthetic (+)-terrein attenuated osteoclast formation and bone resorption by mediating RANKL signaling pathways, especially NFATc1, and indicated the potential effect of (+)-terrein on inflammatory bone resorption including periodontal disease.

DOI： 10.1016/j.intimp.2020.106429

Evaluation of the simulator with automatic irrigation control system designed for countermeasures of internal contamination in dental unit water lines. Reviewed International journal

Keisuke Okubo, Takashi Ito, Kentaro Okamoto, Ichiro Yamamoto, Hajime Mizutani, Yusuke Kawata, Yasuyoshi Shiota, Masahiro Ito, Shin Nakamura, Masako Tai, Tadashi Yamamoto, Shogo Takashiba

Heliyon 6 ( 6 ) e04132 2020.6

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

The prevention of nosocomial infections is an imperative task. The dental chair unit (DCU) is an indispensable device used in dental treatment. However, it is known that the dental unit water line (DUWL) can become contaminated with biofilm, consisting mainly of heterotrophic bacteria (HB). Recently, the International Organization for Standardization specified the methods for testing DUWL contamination management. On these grounds, a simulator reproducing DUWL was prepared to standardize the examination method of the DUWL contamination. Objectives: To evaluate the reproducibility of the DUWL simulator, monitor the DUWL contamination states, and test the efficacy of a commercial decontaminant for DUWL. Methods: The DUWL simulator was assembled by a DCU manufacturing company. The simulator's DUWL was filled with tap water (TW), and left for approximately one year. Neutral electrolyzed water (NEW) was used as a decontaminant for DUWL. Both TW and NEW were passed through DUWL in a timely manner simulating daily dental treatment. Water was sampled from the air turbine hand piece weekly for 4 weeks and used for HB culture. Contamination status was evaluated by measuring bacterial adenosine triphosphate release and by culturing on Reasoner's 2A medium. Results: The DUWL released contaminated water had a bacterial count of over 6 × 104 cfu/mL. After passing NEW through DUWL for 1 week, the count drastically decreased to its basal level and remained steady for 4 weeks. However, TW showed no effect on DUWL decontamination throughout the examination periods. Conclusions: The DUWL simulator could be useful to examine the efficacy of the decontaminant for DUWL and development of new methods in DUWL contamination management.

DOI： 10.1016/j.heliyon.2020.e04132

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