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Ito K, Kurasawa M, Sugimori T, Muraoka H, Hirahara N, Sawada E, Negishi S, Kasai K, Kaneda T. Risk assessment of external apical root resorption associated with orthodontic treatment using computed tomography texture analysis. Oral Radiol 2023; 39:75-82. [PMID: 35303210 DOI: 10.1007/s11282-022-00604-3] [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: 12/27/2021] [Accepted: 02/26/2022] [Indexed: 01/07/2023]
Abstract
OBJECTIVES This study aimed to quantitatively assess maxillary central incisor roots using pre-orthodontics computed tomography (CT) texture analysis as part of a radiomics quantitative analysis. METHODS This retrospective case-control study included 16 patients with external apical root resorption (EARR) and 16 age- and sex-matched patients without EARR, after orthodontic treatment who underwent pre-orthodontics CT for jaw deformities. All patients were treated with a fixed orthodontic appliance before and after surgical orthodontic treatment. EARR was defined as root resorption ≥ 2 mm of the left and right maxillary central incisors on CT images more than 2 years after the start of orthodontic treatment. Texture features of the maxillary central incisor with and without EARR after orthodontic treatment were analyzed using the open-access software, MaZda Ver. 3.3. Ten texture features were selected using the Fisher method in MaZda from 279 original parameters, which were calculated for each of the maxillary central incisors with and without EARR. The results were tested using the Student's t test, Welch's t test, or Mann-Whitney U test. RESULTS Four gray-level run length matrix features and six gray-level co-occurrence matrix features displayed significant differences between both the groups (p < 0.01). CONCLUSIONS CT texture analysis was able to quantitatively assess maxillary central incisor roots and distinguish between maxillary central incisor roots with and without EARR. CT texture analysis may be a useful method for predicting EARR after orthodontic treatment.
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Affiliation(s)
- Kotaro Ito
- Department of Radiology, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba, 271-8587, Japan.
| | - Mayu Kurasawa
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Tadasu Sugimori
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Hirotaka Muraoka
- Department of Radiology, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba, 271-8587, Japan
| | - Naohisa Hirahara
- Department of Radiology, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba, 271-8587, Japan
| | - Eri Sawada
- Department of Radiology, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba, 271-8587, Japan
| | - Shinichi Negishi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Kazutaka Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Takashi Kaneda
- Department of Radiology, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba, 271-8587, Japan
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Negishi S, Richards LC, Hughes T, Kondo S, Kasai K. Genetic contribution to palatal morphology variation using three-dimensional analysis in Australian twins. Arch Oral Biol 2020; 115:104740. [PMID: 32417704 DOI: 10.1016/j.archoralbio.2020.104740] [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: 11/21/2019] [Revised: 04/27/2020] [Accepted: 04/28/2020] [Indexed: 10/24/2022]
Abstract
OBJECTIVE This study aimed to provide insight into the relative contributions of genetic and environmental factors to palatal morphology variation in a cohort of Australian twins. METHODS Healthy Australian twins, aged 12-15 years (45 monozygotic, 46 same sex dizygotic, and 32 opposite-sex dizygotic) were included in the study groups. A scanner was used to obtain three-dimensional data of the maxillary arch. Palatal depth was defined by a line to the deepest point measured from the reference plane at the mid-point of the inter-pre-molar or inter-molar line. This line was then divided into 10 equal sections in order to created 10 different depths for each palatal width. Each palatal width was divided into anterior and posterior areas. Univariate genetic analysis, using the OpenMx structural equation modelling package in R, was carried out on the quantitative data using the normal assumptions of a twin model. RESULTS Heritability estimates for anterior palatal width ranged from 0.75 to 0.80, and from 0.78 to 0.86 for posterior palatal width. Estimates for anterior and posterior palatal depth were 0.72 and 0.86, respectively. CONCLUSIONS Palatal morphology tends to have a moderate to relatively high genetic contribution overall. Palate height has a higher genetic contribution posteriorly than anteriorly. The width of the deep palate is under marginally less stringent genetic regulation than the width of the shallow palate.
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Affiliation(s)
- Shinichi Negishi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Japan; The University of Adelaide Dental School, Australia.
| | | | - Toby Hughes
- The University of Adelaide Dental School, Australia
| | - Shintaro Kondo
- Department of Anatomy, Nihon University School of Dentistry at Matsudo, Japan
| | - Kazutaka Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Japan
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Hayashi R, Kawamura A, Kasai K. Relationship between masticatory function, dental arch width, and bucco-lingual inclination of the first molars. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.odw.2006.08.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Ryosuke Hayashi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-nishi, Matsudo, Chiba 271-8587, Japan
| | - Akira Kawamura
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-nishi, Matsudo, Chiba 271-8587, Japan
| | - Kazutaka Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-nishi, Matsudo, Chiba 271-8587, Japan
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Yamaguchi M, Fujita S, Yoshida T, Oikawa K, Utsunomiya T, Yamamoto H, Kasai K. Low-energy laser irradiation stimulates the tooth movement velocity via expression of M-CSF andc-fms. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.odw.2007.09.002] [Citation(s) in RCA: 18] [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] [Indexed: 10/22/2022]
Affiliation(s)
- Masaru Yamaguchi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba 271-8587, Japan
| | - Shouji Fujita
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba 271-8587, Japan
| | - Takamasa Yoshida
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba 271-8587, Japan
| | - Katsura Oikawa
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba 271-8587, Japan
| | - Tadahiko Utsunomiya
- Department of Oral Pathology, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba 271-8587, Japan
| | - Hirotsugu Yamamoto
- Department of Oral Pathology, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba 271-8587, Japan
| | - Kazutaka Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo, Chiba 271-8587, Japan
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Kariya G, Nariyasu T, Yamaguchi M, Nakajima R, Takano M, Yoshida T, Fujita S, Kasai K. ALP activity decreased in compressed PDL cells obtained from severe orthodontically root resorption. ACTA ACUST UNITED AC 2019. [DOI: 10.1016/j.odw.2007.04.001] [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: 11/16/2022]
Affiliation(s)
- Genichiro Kariya
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo City, Chiba 271-8587, Japan
| | - Takashi Nariyasu
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo City, Chiba 271-8587, Japan
| | - Masaru Yamaguchi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo City, Chiba 271-8587, Japan
| | - Ryo Nakajima
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo City, Chiba 271-8587, Japan
| | - Machi Takano
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo City, Chiba 271-8587, Japan
| | - Takamasa Yoshida
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo City, Chiba 271-8587, Japan
| | - Shouji Fujita
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo City, Chiba 271-8587, Japan
| | - Kazutaka Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho-Nishi, Matsudo City, Chiba 271-8587, Japan
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Negishi S, Richards LC, Kasai K. Relation of dietary preference to masticatory movement and masticatory exercises in Japanese children. Arch Oral Biol 2019; 108:104540. [PMID: 31513984 DOI: 10.1016/j.archoralbio.2019.104540] [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: 06/03/2019] [Revised: 08/20/2019] [Accepted: 08/25/2019] [Indexed: 11/16/2022]
Abstract
OBJECTIVE Modern Japanese children have decreased masticatory function, which can be explained by the dietary change to soft foods. In earlier studies involving children with mixed dentition, masticatory exercises were shown to improve masticatory function and modify dental arch growth. Grinding type of mastication with a wide path reportedly increases lateral growth of the dental arch. This study aimed to assess the relationship between masticatory movements and dietary preference, and how masticatory exercises affected masticatory movement during Hellman's dental stages IIA to IIC (period of first molar eruption). DESIGN In 64 Japanese pre-school children, we measured masticatory movements with foods of five different levels of hardness and investigated the dietary preference for hard foods through a questionnaire. Participants were also required to perform masticatory exercises. Masticatory movements and dietary preference for hard foods were assessed at the start (T1), conclusion (T2), and after six months of exercises (T3). Participants were allocated to Wide and Narrow groups at T1 based on their masticatory path width. RESULTS Baguettes and bananas resulted in the widest and narrowest masticatory paths, respectively, at T1. Results of questionnaire indicated that those eating hard foods had a broad grinding type of masticatory path. Masticatory exercises significantly widened the masticatory path in the Narrow group demonstrating that masticatory exercises help children learn to chew with grinding strokes. Moreover, the masticatory path remained stable on assessment at T3 (six-month follow-up). CONCLUSIONS Masticatory exercises are effective in children who are unable to grind hard foods, affecting their dietary preferences.
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Affiliation(s)
- Shinichi Negishi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Japan; The University of Adelaide Dental School, Australia.
| | | | - Kazutaka Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Japan
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Abstract
The anterior cranial fossa is an important anatomical landmark in clinical orthodontics consisting of the frontal, ethmoid, and sphenoid bones. The relationships between these bones remain poorly understood. The purposes of the present study were to describe the morphological relationships among the three bones and to discuss the factors contributing to individual variations in adult skulls based on postnatal development. Skulls of 100 Indian adults and 18 Japanese juveniles were observed both macroscopically and using computed tomography images in the median sagittal plane. Three types of relationship were seen among the three bones in adult skulls: (a) a triangular border between ethmoid and sphenoid bones (ethmoid spine), (b) a straight or concave border between ethmoid and sphenoid bones, and (c) frontal bone lying between the ethmoid and sphenoid bones. In the juvenile skull, structures corresponding to those in adults were observed. These three bones comprise the anterior cranial base, each with differing developmental processes, and slight differences in these processes seem to be reflected in the morphological variations seen among adults.
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Affiliation(s)
- Emi Kasai
- Department of Orthodontics and Dentofacial Orthodontics, School of Dentistry at MatsudoNihon UniversityChibaJapan
| | - Shintaro Kondo
- Department of Anatomy, School of Dentistry at MatsudoNihon UniversityChibaJapan
| | - Kazutaka Kasai
- Department of Orthodontics and Dentofacial Orthodontics, School of Dentistry at MatsudoNihon UniversityChibaJapan
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Sugimori T, Yamaguchi M, Shimizu M, Kikuta J, Hikida T, Hikida M, Murakami Y, Suemitsu M, Kuyama K, Kasai K. Micro-osteoperforations accelerate orthodontic tooth movement by stimulating periodontal ligament cell cycles. Am J Orthod Dentofacial Orthop 2018; 154:788-796. [PMID: 30477776 DOI: 10.1016/j.ajodo.2018.01.023] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2017] [Revised: 01/01/2018] [Accepted: 01/01/2018] [Indexed: 01/09/2023]
Abstract
INTRODUCTION The aim of this study was to investigate the mechanism of how micro-osteoperforations (MOPs) accelerate tooth movement. We focused on inflammation, cell proliferation, and apoptosis of periodontal ligament cells and performed immunostaining of MOPs exposed to tumor necrosis factor-alpha (TNF-α), proliferating cell nuclear antigen (PCNA), and terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) during experimental tooth movement. METHODS Eleven-week-old male Wistar rats were divided into 2 groups: (1) 10 g of orthodontic force applied to the maxillary first molar (TM) and (2) force application plus 3 small perforations of the cortical plate (TM + MOPs). On days 1, 4, 7, 10, and 14 after force application, we investigated tooth movement and alveolar bone microstructure using microcomputed tomography (n = 5). We also determined the expression of TNF-α and PCNA in the pressure sides of periodontal ligaments via an immunohistochemical analysis. The expression of apoptotic cells was also determined by the TUNEL method. RESULTS The tooth movement in the TM + MOPs group was significantly greater on days 4 to 14 than in the TM group. The TM + MOPs group showed statistically significant decreases in bone volume/tissue volume ratio and bone mineral density compared with the TM group. The ratios of TNF-α positive cells in the TM + MOPs group were increased on days 1, 4. 7, and 10 compared with the TM group. The ratios of PCNA positive cells in the TM + MOPs group were increased on days 1, 4, and 7 compared with the TM group, and the ratios of TUNEL positive cells in the TM + MOPs group were increased on days 1 and 7 compared with the TM group. CONCLUSIONS These results suggest that MOPs may accelerate tooth movement through activation of cell proliferation and apoptosis of periodontal ligament cells.
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Affiliation(s)
- Tadasu Sugimori
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Masaru Yamaguchi
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan.
| | - Mami Shimizu
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Jun Kikuta
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Takuji Hikida
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Momoko Hikida
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Yoshiki Murakami
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Masaaki Suemitsu
- Department of Oral Pathology, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Kayo Kuyama
- Department of Oral Pathology, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Kazutaka Kasai
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
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Minato Y, Yamaguchi M, Shimizu M, Kikuta J, Hikida T, Hikida M, Suemitsu M, Kuyama K, Kasai K. Effect of caspases and RANKL induced by heavy force in orthodontic root resorption. Korean J Orthod 2018; 48:253-261. [PMID: 30003059 PMCID: PMC6041455 DOI: 10.4041/kjod.2018.48.4.253] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2017] [Revised: 11/10/2017] [Accepted: 12/08/2017] [Indexed: 11/21/2022] Open
Abstract
Objective Orthodontic root resorption (ORR) due to orthodontic tooth movement is a difficult treatment-related adverse event. Caspases are important effector molecules for apoptosis. At present, little is known about the mechanisms underlying ORR and apoptosis in the cementum. The aim of the present in vivo study was to investigate the expression of tartrate-resistant acid phosphatase (TRAP), caspase 3, caspase 8, and receptor activator of nuclear factor kappa-B ligand (RANKL) in the cementum in response to a heavy or an optimum orthodontic force. Methods The maxillary molars of male Wistar rats were subjected to an orthodontic force of 10 g or 50 g using a closed coil spring. The rats were sacrificed each experimental period on days 1, 3, 5, and 7 after orthodontic force application. And the rats were subjected to histopathological and immunohistochemical analyses. Results On day 7 for the 50-g group, hematoxylin and eosin staining revealed numerous root resorption lacunae with odontoclasts on the root, while immunohistochemistry showed increased TRAP- and RANKL-positive cells. Caspase 3- and caspase 8-positive cells were increased on the cementum surfaces in the 50-g group on days 3 and 5. Moreover, the number of caspase 3- and caspase 8-positive cells and RANKL-positive cells was significantly higher in the 50-g group than in the 10-g group. Conclusions In our rat model, ORR occurred after apoptosis was induced in the cementum by a heavy orthodontic force. These findings suggest that apoptosis of cementoblasts is involved in ORR.
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Affiliation(s)
- Yukari Minato
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Masaru Yamaguchi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Mami Shimizu
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Jun Kikuta
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Takuji Hikida
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Momoko Hikida
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Masaaki Suemitsu
- Department of Oral Pathology, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Kayo Kuyama
- Department of Oral Pathology, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Kazutaka Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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Sato T, Yamaguchi M, Murakami Y, Horigome Y, Negishi S, Kasai K. Cover Image. Orthod Craniofac Res 2018. [DOI: 10.1111/ocr.12227] [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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Sato T, Yamaguchi M, Murakami Y, Horigome Y, Negishi S, Kasai K. Changes in maxillofacial morphology due to improvement of nasal obstruction in rats. Orthod Craniofac Res 2018; 21:84-89. [PMID: 29493884 DOI: 10.1111/ocr.12220] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [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: 01/23/2018] [Indexed: 12/15/2022]
Abstract
OBJECTIVES To investigate the effect of release of experimentally introduced nasal obstruction on maxillofacial morphology and percutaneous arterial oxygen saturation (SpO2 ) in rats. MATERIALS AND METHODS Six-week-old male Wistar rats (n = 36) were divided into a control group (n = 6) and a nasal obstruction group (n = 30). In the nasal obstruction group, the right nostril was occluded with silicon, which was subsequently removed after a given experimental period (days 7, 21, 35, 49 and 63). These animals were then divided into groups D7, D21, D35, D49 and D63 (each n = 6), according to the day at which the obstruction was released. The SpO2 was measured in rats with nasal obstruction at five experimental points. The maxillofacial morphology in rats on the first day and 63 days after the start of the experiment was evaluated by microcomputed tomography. RESULTS The SpO2 was still lower at 2 weeks after the improvement of the nasal obstruction in the D49 group than in the control group. In addition, the height of the nasal maxillary complex of the D35, D49 and D63 groups was significantly decreased compared with the control group. CONCLUSIONS The results of this study suggest that long-term unilateral nasal obstruction in growing rats may affect the growth of the nasomaxillary complex and reduce the SpO2 permanently. Therefore, early improvement of nasal obstruction in rats during the growth period may improve the SpO2 and cranial development and promote normal growth and development.
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Affiliation(s)
- T Sato
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - M Yamaguchi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Y Murakami
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Y Horigome
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - S Negishi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - K Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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Yao-Umezawa E, Yamaguchi M, Shimizu M, Kikuta J, Suzuki K, Kasai K. Relationship between root resorption and individual variation in the calcium/phosphorous ratio of cementum. Am J Orthod Dentofacial Orthop 2017; 152:465-470. [PMID: 28962729 DOI: 10.1016/j.ajodo.2016.12.029] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2016] [Revised: 12/01/2016] [Accepted: 12/01/2016] [Indexed: 10/18/2022]
Abstract
INTRODUCTION The purpose of this study was to investigate whether individual variation in the hardness and chemical composition of the cementum in the root apex affects the degree of root resorption. METHODS In a previous study, we evaluated the Vickers hardness scale of 50 extracted teeth. For this study, we classified the 50 extracted teeth into soft, moderate, and hard groups according to the Vickers hardness scale. Then, we randomly selected 7 teeth from each group and measured the resorbed areas of the apical cementum in vitro using human osteoclast precursor cells. We also investigated the calcium/phosphorous (Ca/P) and magnesium/calcium ratios of these 21 extracted teeth using energy-dispersive x-ray microanalysis studies to determine the chemical composition of the cementum in the root apex. RESULTS In the pit formation assay, the resorbed area in the soft group showed a greater extent than it did in the moderate and hard groups (P < 0.01). A correlation was noted between the Vickers hardness and the resorbed area of the cementum in the root apex (r = -0.714; P < 0.01). The Ca/P ratios in the soft and moderate groups were lower than the ratio in the hard group (P < 0.01 and P < 0.05, respectively). A correlation was noted between the Vickers hardness and the Ca/P ratio of the cementum in the root apex (r = 0.741; P < 0.01). CONCLUSIONS These results suggest that the hardness and Ca/P ratio of the cementum may be involved in root resorption caused by orthodontic forces.
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Affiliation(s)
- Eriko Yao-Umezawa
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Masaru Yamaguchi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan.
| | - Mami Shimizu
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Jun Kikuta
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Kunihiro Suzuki
- Department of Biology, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Kazutaka Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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Suzuki Y, Saitoh K, Imamura R, Ishii K, Negishi S, Imamura R, Yamaguchi M, Kasai K. Relationship between molar occlusion and masticatory movement in lateral deviation of the mandible. Am J Orthod Dentofacial Orthop 2017; 151:1139-1147. [PMID: 28554459 DOI: 10.1016/j.ajodo.2016.11.023] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2016] [Revised: 11/01/2016] [Accepted: 11/01/2016] [Indexed: 12/25/2022]
Abstract
INTRODUCTION The relationship between molar occlusion and chewing patterns was examined in subjects with laterally deviated mandibles. METHODS Twenty-three patients with mandibular deviation from the midline (4 mm or more) and skeletal Class I (0° ≤ANB ≤4°) were divided into 2 groups: normal bite and crossbite. The chewing pattern was classified as normal, reversed, or crossover. RESULTS The normal bite group had a normal chewing pattern on the affected side 100% of the time and a reversed chewing pattern on the affected and unaffected sides 0% and 7.2% of the time, respectively. Additionally, the normal bite group showed no evidence of a crossover chewing pattern and also had significantly less axial inclination of the mandibular teeth on the affected side compared with the crossbite group; lingual inclination was also evident. The crossbite group had a normal chewing pattern on the affected and unaffected sides 0% and 55.6% of the time, respectively, and reversed and crossover chewing patterns on the affected side 55.6% and 44.4% of the time, respectively. CONCLUSIONS A normal chewing pattern tends to result in lingual axial inclination of the mandibular molars on the affected side, as well as a more consistent chewing pattern.
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Affiliation(s)
- Yuji Suzuki
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan.
| | - Katsuhiko Saitoh
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Ryutaroh Imamura
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Kaori Ishii
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Shinichi Negishi
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Ryuichi Imamura
- Department of Maxillofacial Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Masaru Yamaguchi
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
| | - Kazutaka Kasai
- Department of Orthodontics, School of Dentistry, Nihon University, Matsudo, Chiba, Japan
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Kanehara A, Ando S, Araki T, Usami S, Kuwabara H, Kano Y, Kasai K. Trends in psychological distress and alcoholism after The Great East Japan Earthquake of 2011. SSM Popul Health 2016; 2:807-812. [PMID: 29349191 PMCID: PMC5757822 DOI: 10.1016/j.ssmph.2016.10.010] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2016] [Revised: 10/17/2016] [Accepted: 10/20/2016] [Indexed: 12/04/2022] Open
Abstract
AIMS Many studies have shown that natural disasters affect mental health; however, longitudinal data on post-disaster mental health problems are scarce. The aims of our study were to investigate the trend in psychological distress and alcoholism after The Great East Japan Earthquake and tsunami in north eastern Japan, in March 2011. METHODS A longitudinal study was conducted using annual health check data for the general population, in the city of Higashi-Matsushima, which was affected by the high impact of tsunami. In 2012 and 2013, the Kessler Psychological Distress Scale and the CAGE questionnaire (for screening for alcoholism) were used to assess psychological distress and prevalence of alcoholism. RESULTS Of 11,855 total eligible residents, 2192 received the annual check in 2012 and 2013. The prevalence of mental illness and the mean score of alcoholism tendency increased during the follow-up period. The majority of respondents (43.8%) with baseline serious mental illness (SMI) continued to have SMI at follow-up; only 16.7% reported recovering. Older age, female sex, and severity of home damage predicted higher psychological distress, while male sex was a risk factor for alcoholism at follow-up. CONCLUSIONS Psychological distress deteriorated 2 years after the huge natural disaster, compared with 1 year after the disaster. Long-term mental health care is needed for those affected by natural disasters, particularly those who have suffered loss.
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Affiliation(s)
- A. Kanehara
- Department of Neuropsychiatry, The University of Tokyo, Tokyo, Japan
| | - S. Ando
- Department of Psychiatry and Behavioural Sciences, Tokyo Metropolitan Institute of Medical Science, 2-1-6 Kamikitazawa, Setagaya-ku, Tokyo 156-8506, Japan
| | - T. Araki
- Department of Youth Mental Health, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - S. Usami
- Department of Psychology, University of Tsukuba, Tsukuba, Japan
| | - H. Kuwabara
- Disability Services Office, The University of Tokyo, Tokyo, Japan
| | - Y. Kano
- Department of Child Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - K. Kasai
- Department of Neuropsychiatry, The University of Tokyo, Tokyo, Japan
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15
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Okada N, Fukunaga M, Yamashita F, Koshiyama D, Yamamori H, Ohi K, Yasuda Y, Fujimoto M, Watanabe Y, Yahata N, Nemoto K, Hibar DP, van Erp TGM, Fujino H, Isobe M, Isomura S, Natsubori T, Narita H, Hashimoto N, Miyata J, Koike S, Takahashi T, Yamasue H, Matsuo K, Onitsuka T, Iidaka T, Kawasaki Y, Yoshimura R, Watanabe Y, Suzuki M, Turner JA, Takeda M, Thompson PM, Ozaki N, Kasai K, Hashimoto R. Abnormal asymmetries in subcortical brain volume in schizophrenia. Mol Psychiatry 2016; 21:1460-6. [PMID: 26782053 PMCID: PMC5030462 DOI: 10.1038/mp.2015.209] [Citation(s) in RCA: 238] [Impact Index Per Article: 29.8] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/27/2015] [Revised: 11/06/2015] [Accepted: 11/13/2015] [Indexed: 12/31/2022]
Abstract
Subcortical structures, which include the basal ganglia and parts of the limbic system, have key roles in learning, motor control and emotion, but also contribute to higher-order executive functions. Prior studies have reported volumetric alterations in subcortical regions in schizophrenia. Reported results have sometimes been heterogeneous, and few large-scale investigations have been conducted. Moreover, few large-scale studies have assessed asymmetries of subcortical volumes in schizophrenia. Here, as a work completely independent of a study performed by the ENIGMA consortium, we conducted a large-scale multisite study of subcortical volumetric differences between patients with schizophrenia and controls. We also explored the laterality of subcortical regions to identify characteristic similarities and differences between them. T1-weighted images from 1680 healthy individuals and 884 patients with schizophrenia, obtained with 15 imaging protocols at 11 sites, were processed with FreeSurfer. Group differences were calculated for each protocol and meta-analyzed. Compared with controls, patients with schizophrenia demonstrated smaller bilateral hippocampus, amygdala, thalamus and accumbens volumes as well as intracranial volume, but larger bilateral caudate, putamen, pallidum and lateral ventricle volumes. We replicated the rank order of effect sizes for subcortical volumetric changes in schizophrenia reported by the ENIGMA consortium. Further, we revealed leftward asymmetry for thalamus, lateral ventricle, caudate and putamen volumes, and rightward asymmetry for amygdala and hippocampal volumes in both controls and patients with schizophrenia. Also, we demonstrated a schizophrenia-specific leftward asymmetry for pallidum volume. These findings suggest the possibility of aberrant laterality in neural pathways and connectivity patterns related to the pallidum in schizophrenia.
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Affiliation(s)
- N Okada
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - M Fukunaga
- Division of Cerebral Integration, National Institute for Physiological Sciences, Aichi, Japan
| | - F Yamashita
- Division of Ultrahigh Field MRI, Institute for Biomedical Sciences, Iwate Medical University, Iwate, Japan
| | - D Koshiyama
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - H Yamamori
- Department of Psychiatry, Osaka University Graduate School of Medicine, Osaka, Japan
| | - K Ohi
- Department of Psychiatry, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Y Yasuda
- Department of Psychiatry, Osaka University Graduate School of Medicine, Osaka, Japan
| | - M Fujimoto
- Department of Psychiatry, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Y Watanabe
- Department of Radiology, Osaka University Graduate School of Medicine, Osaka, Japan
| | - N Yahata
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
| | - K Nemoto
- Department of Neuropsychiatry, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
| | - D P Hibar
- Imaging Genetics Center, University of Southern California, Marina del Rey, CA, USA
| | - T G M van Erp
- Department of Psychiatry and Human Behavior, University of California, Irvine, CA, USA
| | - H Fujino
- Graduate School of Human Sciences, Osaka University, Osaka, Japan
| | - M Isobe
- Department of Psychiatry, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - S Isomura
- Department of Neuropsychiatry, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - T Natsubori
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - H Narita
- Department of Psychiatry, Hokkaido University Graduate School of Medicine, Hokkaido, Japan
| | - N Hashimoto
- Department of Psychiatry, Hokkaido University Graduate School of Medicine, Hokkaido, Japan
| | - J Miyata
- Department of Psychiatry, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - S Koike
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
- Office for Mental Health Support, Division for Counseling and Support, The University of Tokyo, Tokyo, Japan
| | - T Takahashi
- Department of Neuropsychiatry, University of Toyama Graduate School of Medicine and Pharmaceutical Sciences, Toyama, Japan
| | - H Yamasue
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - K Matsuo
- Division of Neuropsychiatry, Department of Neuroscience, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan
| | - T Onitsuka
- Department of Neuropsychiatry, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - T Iidaka
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Aichi, Japan
| | - Y Kawasaki
- Department of Neuropsychiatry, Kanazawa Medical University, Ishikawa, Japan
| | - R Yoshimura
- Department of Psychiatry, University of Occupational and Environmental Health, Fukuoka, Japan
| | - Y Watanabe
- Division of Neuropsychiatry, Department of Neuroscience, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan
| | - M Suzuki
- Department of Neuropsychiatry, University of Toyama Graduate School of Medicine and Pharmaceutical Sciences, Toyama, Japan
| | - J A Turner
- Department of Psychology, Georgia State University, Atlanta, GA, USA
- Department of Neuroscience, Georgia State University, Atlanta, GA, USA
| | - M Takeda
- Department of Psychiatry, Osaka University Graduate School of Medicine, Osaka, Japan
| | - P M Thompson
- Imaging Genetics Center, University of Southern California, Marina del Rey, CA, USA
| | - N Ozaki
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Aichi, Japan
| | - K Kasai
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - R Hashimoto
- Department of Psychiatry, Osaka University Graduate School of Medicine, Osaka, Japan
- Molecular Research Center for Children's Mental Development, United Graduate School of Child Development, Osaka University, Osaka, Japan
| | - COCORO
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
- Division of Cerebral Integration, National Institute for Physiological Sciences, Aichi, Japan
- Division of Ultrahigh Field MRI, Institute for Biomedical Sciences, Iwate Medical University, Iwate, Japan
- Department of Psychiatry, Osaka University Graduate School of Medicine, Osaka, Japan
- Department of Radiology, Osaka University Graduate School of Medicine, Osaka, Japan
- Molecular Imaging Center, National Institute of Radiological Sciences, Chiba, Japan
- Department of Neuropsychiatry, Division of Clinical Medicine, Faculty of Medicine, University of Tsukuba, Ibaraki, Japan
- Imaging Genetics Center, University of Southern California, Marina del Rey, CA, USA
- Department of Psychiatry and Human Behavior, University of California, Irvine, CA, USA
- Graduate School of Human Sciences, Osaka University, Osaka, Japan
- Department of Psychiatry, Graduate School of Medicine, Kyoto University, Kyoto, Japan
- Department of Neuropsychiatry, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
- Department of Psychiatry, Hokkaido University Graduate School of Medicine, Hokkaido, Japan
- Office for Mental Health Support, Division for Counseling and Support, The University of Tokyo, Tokyo, Japan
- Department of Neuropsychiatry, University of Toyama Graduate School of Medicine and Pharmaceutical Sciences, Toyama, Japan
- Division of Neuropsychiatry, Department of Neuroscience, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Aichi, Japan
- Department of Neuropsychiatry, Kanazawa Medical University, Ishikawa, Japan
- Department of Psychiatry, University of Occupational and Environmental Health, Fukuoka, Japan
- Department of Psychology, Georgia State University, Atlanta, GA, USA
- Department of Neuroscience, Georgia State University, Atlanta, GA, USA
- Molecular Research Center for Children's Mental Development, United Graduate School of Child Development, Osaka University, Osaka, Japan
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Hikida T, Yamaguchi M, Shimizu M, Kikuta J, Yoshino T, Kasai K. Comparisons of orthodontic root resorption under heavy and jiggling reciprocating forces during experimental tooth movement in a rat model. Korean J Orthod 2016; 46:228-41. [PMID: 27478800 PMCID: PMC4965594 DOI: 10.4041/kjod.2016.46.4.228] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2015] [Revised: 10/21/2015] [Accepted: 11/23/2015] [Indexed: 11/10/2022] Open
Abstract
OBJECTIVE Root mobility due to reciprocating movement of the tooth (jiggling) may exacerbate orthodontic root resorption (ORR). "Jiggling" describes mesiodistal or buccolingual movement of the roots of the teeth during orthodontic treatment. In the present study, buccolingual movement is described as "jiggling." We aimed to investigate the relationship between ORR and jiggling and to test for positive cell expression in odontoclasts in resorbed roots during experimental tooth movement (jiggling) in vivo. METHODS Male Wistar rats were divided into control, heavy force (HF), optimal force (OF), and jiggling force (JF) groups. The expression levels of cathepsin K, matrix metalloproteinase (MMP)-9 protein, interleukin (IL)-6, cytokine-induced neutrophil chemoattractant 1 (CINC-1; an IL-8-related protein in rodents), receptor activator of nuclear factor κB ligand (RANKL), and osteoprotegerin protein in the dental root were determined using immunohistochemistry. RESULTS On day 21, a greater number of root resorption lacunae, which contained multinucleated odontoclasts, were observed in the palatal roots of rats in the JF group than in rats from other groups. Furthermore, there was a significant increase in the numbers of cathepsin K-positive and MMP-9-positive odontoclasts in the JF group on day 21. Immunoreactivities for IL-6, CINC-1, and RANKL were stronger in resorbed roots exposed to jiggling than in the other groups on day 21. Negative reactivity was observed in the controls. CONCLUSIONS These results suggest that jiggling may induce ORR via inflammatory cytokine production during orthodontic tooth movement, and that jiggling may be a risk factor for ORR.
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Affiliation(s)
- Takuji Hikida
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Japan
| | - Masaru Yamaguchi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Japan
| | - Mami Shimizu
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Japan
| | - Jun Kikuta
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Japan
| | - Tomokazu Yoshino
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Japan
| | - Kazutaka Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Japan
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Iida T, Adachi T, Nakagaki S, Yabana T, Goto A, Kondo Y, Watanabe Y, Kasai K. EDUCATION AND IMAGING. Gastrointestinal: Needle tract implantation after endoscopic ultrasound-guided fine-needle aspiration of a pancreatic adenocarcinoma. J Gastroenterol Hepatol 2016; 31:285. [PMID: 26510538 DOI: 10.1111/jgh.13209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/25/2015] [Accepted: 10/16/2015] [Indexed: 12/29/2022]
Affiliation(s)
- T Iida
- Department of Gastroenterology, Otaru General Hospital, Otaru, Japan.
| | - T Adachi
- Department of Gastroenterology, Otaru General Hospital, Otaru, Japan
| | - S Nakagaki
- Department of Gastroenterology, Otaru General Hospital, Otaru, Japan
| | - T Yabana
- Department of Gastroenterology, Otaru General Hospital, Otaru, Japan
| | - A Goto
- Department of Gastroenterology, Otaru General Hospital, Otaru, Japan
| | - Y Kondo
- Department of Gastroenterology, Otaru General Hospital, Otaru, Japan
| | - Y Watanabe
- Department of Surgery, Otaru General Hospital, Otaru, Japan
| | - K Kasai
- Department of Diagnostic Pathology, Otaru General Hospital, Otaru, Japan
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18
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Yamaguchi M, Yao-Umezawa E, Tanimoto Y, Shimizu M, Kikuta J, Hikida T, Takahashi-Hikida M, Horihata S, Suzuki K, Kasai K. Individual Variations in the Hardness and Elastic Modulus of the Human Cementum. J HARD TISSUE BIOL 2016. [DOI: 10.2485/jhtb.25.345] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Masaru Yamaguchi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo
| | - Eriko Yao-Umezawa
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo
| | - Yasuhiro Tanimoto
- Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo
| | - Mami Shimizu
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo
| | - Jun Kikuta
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo
| | - Takuji Hikida
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo
| | | | - Satoshi Horihata
- Department of Mathematical Science, Nihon University School of Dentistry at Matsudo
| | - Kunihiro Suzuki
- Department of Biology, Nihon University School of Dentistry at Matsudo
| | - Kazutaka Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo
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Aso Y, Jojima T, Iijima T, Suzuki K, Terasawa T, Fukushima M, Momobayashi A, Hara K, Takebayashi K, Kasai K, Inukai T. Sitagliptin, a dipeptidyl peptidase-4 inhibitor, increases the number of circulating CD34⁺CXCR4⁺ cells in patients with type 2 diabetes. Endocrine 2015. [PMID: 26209038 DOI: 10.1007/s12020-015-0688-5] [Citation(s) in RCA: 21] [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] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
We investigated the effects of sitagliptin, a dipeptidyl peptidase (DPP)-4 inhibitor, on the number of circulating CD34(+)CXCR4(+)cells, a candidate for endothelial progenitor cells (EPCs), plasma levels of stromal cell-derived factor (SDF)-1α, a ligand for CXCR4 receptor and a substrate for DPP-4, and plasma levels of interferon-inducible protein (IP)-10, for a substrate for DPP-4, in patients with type 2 diabetes. We studied 30 consecutive patients with type 2 diabetes who had poor glycemic control despite treatment with metformin and/or sulfonylurea. Thirty diabetic patients were randomized in a 2:1 ratio into a sitagliptin (50 mg/day) treatment group or an active placebo group (glimepiride 1 mg/day) for 12 weeks. Both groups showed similar improvements in glycemic control. The number of circulating CD34(+)CXCR4(+) cells was increased from 30.5 (20.0, 47.0)/10(6) cells at baseline to 55.5 (31.5, 80.5)/10(6) cells at 12 weeks of treatment with 50 mg/day sitagliptin (P = 0.0014), while showing no significant changes in patients treated with glimepiride. Plasma levels of SDF-1α and IP-10, both physiological substrates of endogenous DPP-4 and chemokines, were significantly decreased at 12 weeks of sitagliptin treatment. In conclusion, treatment with sitagliptin increased the number of circulating CD34(+)CXCR4(+) cells by approximately 2-fold in patients with type 2 diabetes.
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Affiliation(s)
- Yoshimasa Aso
- Department of Endocrinology and Metabolism, Dokkyo Medical University, 880 Kita-Kobayashi, Shimotsuga, Mibu, Tochigi, 321-0293, Japan.
| | - T Jojima
- Department of Endocrinology and Metabolism, Dokkyo Medical University, 880 Kita-Kobayashi, Shimotsuga, Mibu, Tochigi, 321-0293, Japan
| | - T Iijima
- Department of Endocrinology and Metabolism, Dokkyo Medical University, 880 Kita-Kobayashi, Shimotsuga, Mibu, Tochigi, 321-0293, Japan
| | - K Suzuki
- Department of Endocrinology and Metabolism, Dokkyo Medical University, 880 Kita-Kobayashi, Shimotsuga, Mibu, Tochigi, 321-0293, Japan
| | - T Terasawa
- Department of Internal Medicine, Koshigaya Hospital, Dokkyo Medical University, Koshigaya, Saitama, Japan
| | - M Fukushima
- LSI Medience Corp., Itabashi-Ku, Tokyo, Japan
| | | | - K Hara
- Department of Internal Medicine, Koshigaya Hospital, Dokkyo Medical University, Koshigaya, Saitama, Japan
| | - K Takebayashi
- Department of Internal Medicine, Koshigaya Hospital, Dokkyo Medical University, Koshigaya, Saitama, Japan
| | - K Kasai
- Department of Medicine, Ishibashi General Hospital, Shimotsuke, Tochigi, Japan
| | - T Inukai
- Department of Internal Medicine, Koshigaya Hospital, Dokkyo Medical University, Koshigaya, Saitama, Japan
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21
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Imamura K, Kawakami N, Furukawa TA, Matsuyama Y, Shimazu A, Umanodan R, Kawakami S, Kasai K. Does Internet-based cognitive behavioral therapy (iCBT) prevent major depressive episode for workers? A 12-month follow-up of a randomized controlled trial. Psychol Med 2015; 45:1907-1917. [PMID: 25562115 DOI: 10.1017/s0033291714003006] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
BACKGROUND In this study we investigated whether an Internet-based computerized cognitive behavioral therapy (iCBT) program can decrease the risk of DSM-IV-TR major depressive episodes (MDE) during a 12-month follow-up of a randomized controlled trial of Japanese workers. METHOD Participants were recruited from one company and three departments of another company. Those participants who did not experience MDE in the past month were randomly allocated to intervention or control groups (n = 381 for each). A 6-week, six-lesson iCBT program was provided to the intervention group. While the control group only received the usual preventive mental health service for the first 6 months, the control group was given a chance to undertake the iCBT program after a 6-month follow-up. The primary outcome was a new onset of DSM-IV-TR MDE during the 12-month follow-up, as assessed by means of the web version of the WHO Composite International Diagnostic Interview (CIDI), version 3.0 depression section. RESULTS The intervention group had a significantly lower incidence of MDE at the 12-month follow-up than the control group (Log-rank χ2 = 7.04, p < 0.01). The hazard ratio for the intervention group was 0.22 (95% confidence interval 0.06-0.75), when estimated by the Cox proportional hazard model. CONCLUSIONS The present study demonstrates that an iCBT program is effective in preventing MDE in the working population. However, it should be noted that MDE was measured by self-report, while the CIDI can measure the episodes more strictly following DSM-IV criteria.
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Affiliation(s)
- K Imamura
- Department of Mental Health,Graduate School of Medicine, The University of Tokyo,Tokyo,Japan
| | - N Kawakami
- Department of Mental Health,Graduate School of Medicine, The University of Tokyo,Tokyo,Japan
| | - T A Furukawa
- Departments of Health Promotion and Human Behavior and of Clinical Epidemiology,Graduate School of Medicine/School of Public Health, Kyoto University,Kyoto,Japan
| | - Y Matsuyama
- Department of Biostatistics,Graduate School of Medicine, The University of Tokyo,Tokyo,Japan
| | - A Shimazu
- Department of Mental Health,Graduate School of Medicine, The University of Tokyo,Tokyo,Japan
| | - R Umanodan
- Kyoto office,Health Wave Co., Ltd,Kyoto,Japan
| | - S Kawakami
- Nippon University College of the Arts,Tokyo,Japan
| | - K Kasai
- Department of Neuropsychiatry,Graduate School of Medicine, The University of Tokyo,Tokyo,Japan
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22
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Inami T, Tanimoto Y, Minami N, Yamaguchi M, Kasai K. Color stability of laboratory glass-fiber-reinforced plastics for esthetic orthodontic wires. Korean J Orthod 2015; 45:130-5. [PMID: 26023541 PMCID: PMC4446374 DOI: 10.4041/kjod.2015.45.3.130] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2014] [Revised: 10/26/2014] [Accepted: 11/14/2014] [Indexed: 12/03/2022] Open
Abstract
OBJECTIVE In our previous study, glass-fiber-reinforced plastics (GFRPs) made from polycarbonate and glass fibers were prepared for esthetic orthodontic wires using pultrusion. These laboratory GFRP wires are more transparent than the commercially available nickel-titanium wire; however, an investigation of the color stability of GFRP during orthodontic treatment is needed. Accordingly, in the present study, the color stability of GFRP was assessed using colorimetry. METHODS Preparation of GFRP esthetic round wires (diameter: 0.45 mm [0.018 inch]) using pultrusion was described previously. Here, to investigate how the diameter of fiber reinforcement affects color stability, GFRPs were prepared by incorporating either 13-µm (GFRP-13) or 7-µm glass (GFRP-7) fibers. The color changes of GFRPs after 24 h, and following 1, 2, and 4 weeks of coffee immersion at 37℃, were measured by colorimetry. We evaluated the color stability of GFRPs by two evaluating units: the color difference (ΔE(*)) and National Bureau of Standards (NBS). RESULTS After immersion, both GFRPs showed almost no visible color change. According to the colorimetry measurements, the ΔE(*) values of GFRP-13 and GFRP-7 were 0.73-1.16, and 0.62-1.10, respectively. In accordance with NBS units, both GFRPs showed "slight" color changes. As a result, there were no significant differences in the ΔE(*) values or NBS units for GFRP-13 or GFRP-7. Moreover, for both GFRPs, no significant differences were observed in any of the immersion periods. CONCLUSIONS Our findings suggest that the GFRPs will maintain high color stability during orthodontic treatment, and are an attractive prospect as esthetic orthodontic wires.
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Affiliation(s)
- Toshihiro Inami
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Yasuhiro Tanimoto
- Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Naomi Minami
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Masaru Yamaguchi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Kazutaka Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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Aoki Y, Watanabe T, Abe O, Kuwabara H, Yahata N, Takano Y, Iwashiro N, Natsubori T, Takao H, Kawakubo Y, Kasai K, Yamasue H. Oxytocin's neurochemical effects in the medial prefrontal cortex underlie recovery of task-specific brain activity in autism: a randomized controlled trial. Mol Psychiatry 2015; 20:447-53. [PMID: 25070538 PMCID: PMC4378254 DOI: 10.1038/mp.2014.74] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 05/02/2014] [Accepted: 06/06/2014] [Indexed: 01/22/2023]
Abstract
The neuropeptide oxytocin may be an effective therapeutic strategy for the currently untreatable social and communication deficits associated with autism. Our recent paper reported that oxytocin mitigated autistic behavioral deficits through the restoration of activity in the ventromedial prefrontal cortex (vmPFC), as demonstrated with functional magnetic resonance imaging (fMRI) during a socio-communication task. However, it is unknown whether oxytocin exhibited effects at the neuronal level, which was outside of the specific task examined. In the same randomized, double-blind, placebo-controlled, within-subject cross-over clinical trial in which a single dose of intranasal oxytocin (24 IU) was administered to 40 men with high-functioning autism spectrum disorder (UMIN000002241/000004393), we measured N-acetylaspartate (NAA) levels, a marker for neuronal energy demand, in the vmPFC using (1)H-magnetic resonance spectroscopy ((1)H-MRS). The differences in the NAA levels between the oxytocin and placebo sessions were associated with oxytocin-induced fMRI signal changes in the vmPFC. The oxytocin-induced increases in the fMRI signal could be predicted by the NAA differences between the oxytocin and placebo sessions (P=0.002), an effect that remained after controlling for variability in the time between the fMRI and (1)H-MRS scans (P=0.006) and the order of administration of oxytocin and placebo (P=0.001). Furthermore, path analysis showed that the NAA differences in the vmPFC triggered increases in the task-dependent fMRI signals in the vmPFC, which consequently led to improvements in the socio-communication difficulties associated with autism. The present study suggests that the beneficial effects of oxytocin are not limited to the autistic behavior elicited by our psychological task, but may generalize to other autistic behavioral problems associated with the vmPFC.
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Affiliation(s)
- Y Aoki
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - T Watanabe
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan,Department of Physiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - O Abe
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan,Department of Radiology, Nihon University School of Medicine, Tokyo, Japan
| | - H Kuwabara
- Department of Child Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - N Yahata
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Y Takano
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - N Iwashiro
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - T Natsubori
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - H Takao
- Department of Radiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Y Kawakubo
- Department of Child Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - K Kasai
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - H Yamasue
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan,Japan Science and Technology Agency, CREST, Tokyo, Japan,Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Tokyo 113-8655, Japan. E-mail:
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Inami T, Tanimoto Y, Yamaguchi M, Shibata Y, Nishiyama N, Kasai K. Surface topography, hardness, and frictional properties of GFRP for esthetic orthodontic wires. J Biomed Mater Res B Appl Biomater 2015; 104:88-95. [PMID: 25631358 DOI: 10.1002/jbm.b.33372] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2014] [Revised: 12/08/2014] [Accepted: 12/17/2014] [Indexed: 11/06/2022]
Abstract
In our previous study, glass-fiber-reinforced plastics (GFRPs) made from polycarbonate and glass fiber for esthetic orthodontic wires were prepared by using pultrusion. The purpose of the present study was to investigate the surface topography, hardness, and frictional properties of GFRPs. To investigate how fiber diameter affects surface properties, GFRP round wires with a diameter of 0.45 mm (0.018 in.) were prepared incorporating either 13 μm (GFRP-13) or 7 μm (GFRP-7) glass fibers. As controls, stainless steel (SS), cobalt-chromium-nickel alloy, β-titanium (β-Ti) alloy, and nickel-titanium (Ni-Ti) alloy were also evaluated. Under scanning electron microscopy and scanning probe microscopy, the β-Ti samples exhibited greater surface roughness than the other metallic wires and the GFRP wires. The dynamic hardness and elastic modulus of GFRP wires obtained by the dynamic micro-indentation method were much lower than those of metallic wires (p < 0.05). Frictional forces against the polymeric composite brackets of GFRP-13 and GFRP-7 were 3.45 ± 0.49 and 3.60 ± 0.38 N, respectively; frictional forces against the ceramic brackets of GFRP-13 and GFRP-7 were 3.39 ± 0.58 and 3.87 ± 0.48 N, respectively. For both bracket types, frictional forces of GFRP wires and Ni-Ti wire were nearly half as low as those of SS, Co-Cr, and β-Ti wires. In conclusion, there was no significant difference in surface properties between GFRP-13 and GFRP-7; presumably because both share the same polycarbonate matrix. We expect that GFRP wires will deliver superior sliding mechanics with low frictional resistance between the wire and bracket during orthodontic treatment.
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Affiliation(s)
- Toshihiro Inami
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho Nishi, Matsudo, Chiba, 271-8587, Japan
| | - Yasuhiro Tanimoto
- Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho Nishi, Matsudo, Chiba, 271-8587, Japan
| | - Masaru Yamaguchi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho Nishi, Matsudo, Chiba, 271-8587, Japan
| | - Yo Shibata
- Department of Conservative Dentistry, Division of Biomaterials and Engineering, Showa University School of Dentistry, 1-5-8 Hatanodai, Shinagawa-ku, Tokyo, 142-8555, Japan
| | - Norihiro Nishiyama
- Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho Nishi, Matsudo, Chiba, 271-8587, Japan
| | - Kazutaka Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho Nishi, Matsudo, Chiba, 271-8587, Japan
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Takahashi M, Yamaguchi M, Tanimoto Y, Yao-Umezawa E, Kasai K. Biological Evaluation of a Prototype Material made of Polyglycolic Acid and Hydroxyapatite. J HARD TISSUE BIOL 2015. [DOI: 10.2485/jhtb.24.375] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Momoko Takahashi
- Departments of Orthodontics, Nihon University School of Dentistry at Matsudo
| | - Masaru Yamaguchi
- Departments of Orthodontics, Nihon University School of Dentistry at Matsudo
| | - Yasuhiro Tanimoto
- Dental Biomaterials, Nihon University School of Dentistry at Matsudo
| | - Eriko Yao-Umezawa
- Departments of Orthodontics, Nihon University School of Dentistry at Matsudo
| | - Kazutaka Kasai
- Departments of Orthodontics, Nihon University School of Dentistry at Matsudo
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Tani A, Yasui T, Kasai K, Keyama K, Matsui S, Kato T, Irahara M. Different circulating levels of monocyte chemoattractant protein-1 and interleukin-8 during the menopausal transition. J Reprod Immunol 2014. [DOI: 10.1016/j.jri.2014.09.036] [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: 10/24/2022]
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Abstract
In this study, we first investigated the expressions of Jagged1, Notch2, the receptor activator of nuclear factor–kappa B ligand (RANKL), and interleukin (IL)-6 in areas of root resorption during experimental tooth movement in rats in vivo. We then assessed the effects of compression force (CF) with or without GSI (an inhibitor of Notch signaling) on Jagged1, RANKL, and IL-6 release from human periodontal ligament (hPDL) cells. Twelve male 6-wk-old Wistar rats were subjected to an orthodontic force of 50 g to induce mesially tipping movement of the upper first molars for 7 d. The expression levels of tartrate-resistant acid phosphatase, Jagged1, Notch2, IL-6, and RANKL proteins in the dental root were determined using an immunohistochemical analysis. Furthermore, the effects of the CF on Jagged1, IL-6, and RANKL production were investigated using hPDL cells in vitro. The effects of the cell-conditioned medium obtained from the hPDL cells subjected to CF (CFM) and Jagged 1 on osteoclastogenesis of human osteoclast precursor cells (hOCPs) were also investigated. Under the conditions of experimental tooth movement in vivo, resorption lacunae with multinucleated cells were observed in the 50 g group. In addition, immunoreactivity for Jagged1, Notch2, IL-6, and RANKL was detected on day 7 in the PDL tissue subjected to the orthodontic force. In the in vitro study, the compression force increased the production of Jagged1, IL-6, and RANKL from the hPDL cells, whereas treatment with GSI inhibited the production of these factors in vitro. The osteoclastogenesis increased with the CFM and rhJagged1, and the increase in the osteoclastogenesis was almost inhibited by GSI. These results suggest that the Notch signaling response to excessive orthodontic forces stimulates the process of root resorption via RANKL and IL-6 production from hPDL cells.
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Affiliation(s)
- J. Kikuta
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Matsudo, Japan
| | - M. Yamaguchi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Matsudo, Japan
| | - M. Shimizu
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Matsudo, Japan
| | - T. Yoshino
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Matsudo, Japan
| | - K. Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Matsudo, Japan
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Hashimoto R, Ikeda M, Yamashita F, Ohi K, Yamamori H, Yasuda Y, Fujimoto M, Fukunaga M, Nemoto K, Takahashi T, Tochigi M, Onitsuka T, Yamasue H, Matsuo K, Iidaka T, Iwata N, Suzuki M, Takeda M, Kasai K, Ozaki N. Common variants at 1p36 are associated with superior frontal gyrus volume. Transl Psychiatry 2014; 4:e472. [PMID: 25335168 PMCID: PMC4350516 DOI: 10.1038/tp.2014.110] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2014] [Revised: 08/04/2014] [Accepted: 08/31/2014] [Indexed: 12/29/2022] Open
Abstract
The superior frontal gyrus (SFG), an area of the brain frequently found to have reduced gray matter in patients with schizophrenia, is involved in self-awareness and emotion, which are impaired in schizophrenia. However, no genome-wide association studies of SFG volume have investigated in patients with schizophrenia. To identify single-nucleotide polymorphisms (SNPs) associated with SFG volumes, we demonstrated a genome-wide association study (GWAS) of gray matter volumes in the right or left SFG of 158 patients with schizophrenia and 378 healthy subjects. We attempted to bioinformatically ascertain the potential effects of the top hit polymorphism on the expression levels of genes at the genome-wide region. We found associations between five variants on 1p36.12 and the right SFG volume at a widely used benchmark for genome-wide significance (P<5.0 × 10(-8)). The strongest association was observed at rs4654899, an intronic SNP in the eukaryotic translation initiation factor 4 gamma, 3 (EIF4G3) gene on 1p36.12 (P=7.5 × 10(-9)). No SNP with genome-wide significance was found in the volume of the left SFG (P>5.0 × 10(-8)); however, the rs4654899 polymorphism was identified as the locus with the second strongest association with the volume of the left SFG (P=1.5 × 10(-6)). In silico analyses revealed a proxy SNP of rs4654899 had effect on gene expression of two genes, HP1BP3 lying 3' to EIF4G3 (P=7.8 × 10(-6)) and CAPN14 at 2p (P=6.3 × 10(-6)), which are expressed in moderate-to-high levels throughout the adult human SFG. These results contribute to understand genetic architecture of a brain structure possibly linked to the pathophysiology of schizophrenia.
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Affiliation(s)
- R Hashimoto
- Molecular Research Center for Children's Mental Development, United Graduate School of Child Development, Osaka University, Suita, Osaka, Japan,Department of Psychiatry, Osaka University Graduate School of Medicine, Suita, Osaka, Japan,Molecular Research Center for Children's Mental Development, United Graduate School of Child Development, Osaka University, D3, 2-2, Yamadaoka, Suita, Osaka 5650871, Japan. E-mail:
| | - M Ikeda
- Department of Psychiatry, Fujita Health University School of Medicine, Toyoake, Aichi, Japan
| | - F Yamashita
- Division of Ultrahigh Field MRI, Institute for Biomedical Sciences, Iwate Medical University, Yahaba, Iwate, Japan
| | - K Ohi
- Department of Psychiatry, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - H Yamamori
- Department of Psychiatry, Osaka University Graduate School of Medicine, Suita, Osaka, Japan,Department of Molecular Neuropsychiatry, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - Y Yasuda
- Department of Psychiatry, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - M Fujimoto
- Department of Psychiatry, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - M Fukunaga
- Biofunctional Imaging, Immunology Frontier Research Center, Osaka University, Suita, Osaka, Japan
| | - K Nemoto
- Department of Neuropsychiatry, Institute of Clinical Medicine, University of Tsukuba, Ibaraki, Japan
| | - T Takahashi
- Department of Neuropsychiatry, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - M Tochigi
- Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - T Onitsuka
- Department of Neuropsychiatry, Graduate School of Medical Sciences, Kyushu University, Fukuoka, Japan
| | - H Yamasue
- Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - K Matsuo
- Division of Neuropsychiatry, Department of Neuroscience, Yamaguchi University Graduate School of Medicine, Yamaguchi, Japan
| | - T Iidaka
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
| | - N Iwata
- Department of Psychiatry, Fujita Health University School of Medicine, Toyoake, Aichi, Japan
| | - M Suzuki
- Department of Neuropsychiatry, Graduate School of Medicine and Pharmaceutical Sciences, University of Toyama, Toyama, Japan
| | - M Takeda
- Molecular Research Center for Children's Mental Development, United Graduate School of Child Development, Osaka University, Suita, Osaka, Japan,Department of Psychiatry, Osaka University Graduate School of Medicine, Suita, Osaka, Japan
| | - K Kasai
- Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Tokyo, Japan
| | - N Ozaki
- Department of Psychiatry, Nagoya University Graduate School of Medicine, Nagoya, Aichi, Japan
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Tanimoto Y, Inami T, Yamaguchi M, Nishiyama N, Kasai K. Preparation, mechanical, and in vitro properties of glass fiber-reinforced polycarbonate composites for orthodontic application. J Biomed Mater Res B Appl Biomater 2014; 103:743-50. [PMID: 25052046 DOI: 10.1002/jbm.b.33245] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [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: 02/13/2014] [Revised: 06/15/2014] [Accepted: 07/05/2014] [Indexed: 11/11/2022]
Abstract
Generally, orthodontic treatment uses metallic wires made from stainless steel, cobalt-chromium-nickel alloy, β-titanium alloy, and nickel-titanium (Ni-Ti) alloy. However, these wires are not esthetically pleasing and may induce allergic or toxic reactions. To correct these issues, in the present study we developed glass-fiber-reinforced plastic (GFRP) orthodontic wires made from polycarbonate and E-glass fiber by using pultrusion. After fabricating these GFRP round wires with a diameter of 0.45 mm (0.018 inch), we examined their mechanical and in vitro properties. To investigate how the glass-fiber diameter affected their physical properties, we prepared GFRP wires of varying diameters (7 and 13 µm). Both the GFRP with 13-µm fibers (GFRP-13) and GFRP with 7 µm fibers (GFRP-7) were more transparent than the metallic orthodontic wires. Flexural strengths of GFRP-13 and GFRP-7 were 690.3 ± 99.2 and 938.1 ± 95.0 MPa, respectively; flexural moduli of GFRP-13 and GFRP-7 were 25.4 ± 4.9 and 34.7 ± 7.7 GPa, respectively. These flexural properties of the GFRP wires were nearly equivalent to those of available Ni-Ti wires. GFRP-7 had better flexural properties than GFRP-13, indicating that the flexural properties of GFRP increase with decreasing fiber diameter. Using thermocycling, we found no significant change in the flexural properties of the GFRPs after 600 or 1,200 cycles. Using a cytotoxicity detection kit, we found that the glass fiber and polycarbonate components comprising the GFRP were not cytotoxic within the limitations of this study. We expect this metal-free GFRP wire composed of polycarbonate and glass fiber to be useful as an esthetically pleasing alternative to current metallic orthodontic wire.
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Affiliation(s)
- Yasuhiro Tanimoto
- Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo, 2-870-1 Sakaecho Nishi, Matsudo, Chiba, 271-8587, Japan
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Yoshino T, Yamaguchi M, Shimizu M, Yamada K, Kasai K. TNF-α Aggravates the Progression of Orthodontically-induced Inflammatory Root Resorption in the Presence of RANKL. J HARD TISSUE BIOL 2014. [DOI: 10.2485/jhtb.23.155] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Kunii R, Yamaguchi M, Tanimoto Y, Asano M, Yamada K, Goseki T, Kasai K. Role of interleukin-6 in orthodontically induced inflammatory root resorption in humans. Korean J Orthod 2013; 43:294-301. [PMID: 24396739 PMCID: PMC3879286 DOI: 10.4041/kjod.2013.43.6.294] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2013] [Revised: 06/12/2013] [Accepted: 06/13/2013] [Indexed: 01/14/2023] Open
Abstract
Objective To determine the interleukin (IL)-6 levels in gingival crevicular fluid (GCF) of patients with severe root resorption after orthodontic treatment and investigate the effects of different static compressive forces (CFs) on IL-6 production by human periodontal ligament (hPDL) cells and the influence of IL-6 on osteoclastic activation from human osteoclastic precursor (hOCP) cells in vitro. Methods IL-6 levels in GCF samples collected from 20 patients (15 and 5 subjects without and with radiographic evidence of severe root resorption, respectively) who had undergone orthodontic treatment were measured by ELISA. The levels of IL-6 mRNA in hPDL cells and IL-6 protein in conditioned medium after the application of different uniform CFs (0, 1.0, 2.0, or 4.0 g/cm2 for up to 72 h) were measured by real-time PCR and ELISA, respectively. Finally, the influence of IL-6 on mature osteoclasts was investigated by using hOCP cells on dentin slices in a pit-formation assay. Results Clinically, the IL-6 levels were significantly higher in the resorption group than in the control group. In vitro, IL-6 mRNA expression significantly increased with increasing CF. IL-6 protein secretion also increased in a time- and magnitude-dependent manner. Resorbed areas on dentin slices were significantly greater in the recombinant human IL-6-treated group and group cultured in hPDL cell-conditioned medium with CF application (4.0 g/cm2) than in the group cultured in hPDL cell-conditioned medium without CF application. Conclusions IL-6 may play an important role in inducing or facilitating orthodontically induced inflammatory root resorption.
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Affiliation(s)
- Ryuichi Kunii
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Masaru Yamaguchi
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Yasuhiro Tanimoto
- Department of Dental Biomaterials, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Masaki Asano
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Kunihiko Yamada
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Takemi Goseki
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | - Kazutaka Kasai
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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Yamaguchi M, Yamada K, Shimizu M, Yoshino T, Kikuta J, Kasai K. 287. Cytokine 2013. [DOI: 10.1016/j.cyto.2013.06.290] [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: 10/26/2022]
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Shimizu M, Yamaguchi M, Fujita S, Utsunomiya T, Yamamoto H, Kasai K. Interleukin-17/T-helper 17 cells in an atopic dermatitis mouse model aggravate orthodontic root resorption in dental pulp. Eur J Oral Sci 2013; 121:101-10. [PMID: 23489899 DOI: 10.1111/eos.12024] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/01/2012] [Indexed: 02/01/2023]
Abstract
Interleukin (IL)-17 is an important mediator of orthodontically induced inflammatory root resorption (OIIRR). However, its role in the dental pulp (DP) has not been studied. The aim of this study was to investigate, using an atopic dermatitis (AD) model, how IL-17 contributes to OIIRR in DP. Atopic dermatitis is the most common IL-17-associated allergic disease. Atopic dermatitis model mice (AD group) and wild-type mice (control group) were subjected to an excessive orthodontic force. The localization of T-helper (Th)17 cells, IL-17, IL-6, and keratinocyte chemoattractant (KC; an IL-8-related protein in rodents) were determined in DP. In addition, CD4+ T cells, including IL-17 production cells, were obtained from patients with AD and from healthy donors, and the effects of IL-17 on the production of IL-6 and IL-8 were investigated using a co-culture of CD4+ T cells with human dental pulp (hDP) cells stimulated with substance P (SP). Immunoreactivity for Th17 cells, IL-17, IL-6, and KC was increased in DP tissue subjected to orthodontic force in the AD group compared with DP tissue subjected to orthodontic force in the control group. The cells obtained from the AD patients displayed increased IL-6 and IL-8 production. These results suggest that IL-17 may aggravate OIIRR in DP.
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Affiliation(s)
- Mami Shimizu
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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Ando J, Yamaguchi M, Fujita S, Kawamura A, Utsunomiya T, Kasai K. Morphological and Histological Changes in the Mandibular Condyle after Plate Removal in Experimental Models of Short- and Long-term Mandibular Lateral Displacement. J HARD TISSUE BIOL 2013. [DOI: 10.2485/jhtb.22.201] [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: 10/26/2022]
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Funakoshi M, Yamaguchi M, Asano M, Fujita S, Kasai K. Effect of Compression Force on Apoptosis in Human Periodontal Ligament Cells. J HARD TISSUE BIOL 2013. [DOI: 10.2485/jhtb.22.41] [Citation(s) in RCA: 3] [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: 10/27/2022]
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Yamada K, Yamaguchi M, Asano M, Fujita S, Kobayashi R, Kasai K. Th17-cells in atopic dermatitis stimulate orthodontic root resorption. Oral Dis 2012; 19:683-93. [PMID: 23279451 DOI: 10.1111/odi.12053] [Citation(s) in RCA: 11] [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: 08/29/2012] [Revised: 10/15/2012] [Accepted: 11/25/2012] [Indexed: 12/19/2022]
Abstract
OBJECTIVE The aim of this study was to investigate how atopic dermatitis (AD) contributes to root resorption during orthodontic tooth movement. MATERIALS AND METHODS Atopic dermatitis model mice and wild-type mice were subjected to an excessive orthodontic force (OF) to induce movement of the upper first molars. The expression levels of the tartrate-resistant acid phosphatase (TRAP), IL-17, IL-6, and RANKL proteins were determined in the periodontal ligament (PDL) by an immunohistochemical analysis. Furthermore, the effects of the compression force on co-cultures of CD4(+) cells from AD patients or healthy individuals and human PDL cells were investigated with regard to the levels of secretion and mRNA expression of IL-17, IL-6, RANKL, and osteoprotegerin. RESULTS The immunoreactivities for TRAP, IL-17, IL-6, and RANKL in the AD group were found to be significantly increased. The double immunofluorescence analysis for IL-17/CD4 detected immunoreaction. The secretion of IL-17, IL-6, and RANKL, and the mRNA levels of IL-6 and RANKL in the AD patients were increased compared with those in healthy individuals. CONCLUSION Th17 cells may therefore be associated with the deterioration of root resorption of AD mice, and may explain why AD patients are more susceptible to root resorption than healthy individuals when an excessive OF is applied.
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Affiliation(s)
- K Yamada
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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Aoki Y, Kasai K, Yamasue H. Age-related change in brain metabolite abnormalities in autism: a meta-analysis of proton magnetic resonance spectroscopy studies. Transl Psychiatry 2012; 2:e69. [PMID: 22832731 PMCID: PMC3309540 DOI: 10.1038/tp.2011.65] [Citation(s) in RCA: 65] [Impact Index Per Article: 5.4] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/28/2011] [Accepted: 11/28/2011] [Indexed: 02/05/2023] Open
Abstract
Abnormal trajectory of brain development has been suggested by previous structural magnetic resonance imaging and head circumference findings in autism spectrum disorders (ASDs); however, the neurochemical backgrounds remain unclear. To elucidate neurochemical processes underlying aberrant brain growth in ASD, we conducted a comprehensive literature search and a meta-analysis of (1)H-magnetic resonance spectroscopy ((1)H-MRS) studies in ASD. From the 22 articles identified as satisfying the criteria, means and s.d. of measure of N-acetylaspartate (NAA), creatine, choline-containing compounds, myo-Inositol and glutamate+glutamine in frontal, temporal, parietal, amygdala-hippocampus complex, thalamus and cerebellum were extracted. Random effect model analyses showed significantly lower NAA levels in all the examined brain regions but cerebellum in ASD children compared with typically developed children (n=1295 at the maximum in frontal, P<0.05 Bonferroni-corrected), although there was no significant difference in metabolite levels in adulthood. Meta-regression analysis further revealed that the effect size of lower frontal NAA levels linearly declined with older mean age in ASD (n=844, P<0.05 Bonferroni-corrected). The significance of all frontal NAA findings was preserved after considering between-study heterogeneities (P<0.05 Bonferroni-corrected). This first meta-analysis of (1)H-MRS studies in ASD demonstrated robust developmental changes in the degree of abnormality in NAA levels, especially in frontal lobes of ASD. Previously reported larger-than-normal brain size in ASD children and the coincident lower-than-normal NAA levels suggest that early transient brain expansion in ASD is mainly caused by an increase in non-neuron tissues, such as glial cell proliferation.
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Affiliation(s)
- Y Aoki
- Department of Neuropsychiatry, Graduate School of Medicine, The University of Tokyo, Bunkyo-ku, Tokyo, Japan.
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Hayashi N, Yamaguchi M, Nakajima R, Utsunomiya T, Yamamoto H, Kasai K. T-helper 17 cells mediate the osteo/odontoclastogenesis induced by excessive orthodontic forces. Oral Dis 2012; 18:375-88. [DOI: 10.1111/j.1601-0825.2011.01886.x] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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Abstract
The relapse of teeth that have moved during orthodontic treatment is a major clinical issue with respect to the goals of successful treatment. Relaxin has an influence on many physiologic processes, such as collagen turnover. In this study, we determined the effects of relaxin on the relapse and remodeling of periodontal tissue after experimental tooth movement in rats, and we explored the molecular mechanism underlying these processes. To induce experimental tooth movement in rats, 10 g of orthodontic force was applied to the molars. After 14 days, the spring was removed, and then animals began receiving relaxin at a dose of 500 ng/ml for 1 week. The results were evaluated by micro-computed tomography and immunofluorescence staining. In addition, the effects of matrix metalloproteinase (MMP)-1 and MMP-8 production were investigated in human periodontal ligament (hPDL) cells in vitro. The expression of MMP-1 and MMP-8 was analyzed by real-time polymerase chain reaction and enzyme-linked immunosorbent assay. Furthermore, we demonstrated the signaling pathways involved in relaxin-regulated MMPs expression. The relapse distances and percentages were significantly decreased in the experimental group compared with the controls in vivo. A double-immunofluorescence analysis for Col-I/MMP-1 and Col-I/MMP-8 detected the expression of relaxin in the PDL. Relaxin significantly increased the MMP-1 and MMP-8 expression in a time-dependent manner in hPDL cells in vitro. Furthermore, a p38 inhibitor (SB203580) significantly inhibited the MMP-1 and MMP-8 expression. Our results indicated that relaxin modulates the collagen metabolism, and this hormone may therefore be useful to prevent orthodontic relapse following orthodontic treatment.
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Affiliation(s)
- Yurie Hirate
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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Okada H, Iwamaru Y, Kakizaki M, Masujin K, Imamura M, Fukuda S, Matsuura Y, Shimizu Y, Kasai K, Mohri S, Yokoyama T. Properties of L-type bovine spongiform encephalopathy in intraspecies passages. Vet Pathol 2011; 49:819-23. [PMID: 22081134 DOI: 10.1177/0300985811427150] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
The origin and transmission routes of atypical bovine spongiform encephalopathy (BSE) remain unclear. To assess whether the biological and biochemical characteristics of atypical L-type BSE detected in Japanese cattle (BSE/JP24) are conserved during serial passages within a single host, 3 calves were inoculated intracerebrally with a brain homogenate prepared from first-passaged BSE/JP24-affected cattle. Detailed immunohistochemical and neuropathologic analysis of the brains of second-passaged animals, which had developed the disease and survived for an average of 16 months after inoculation, revealed distribution of spongiform changes and disease-associated prion protein (PrP(Sc)) throughout the brain. Although immunolabeled PrP(Sc) obtained from brain tissue was characterized by the presence of PrP plaques and diffuse synaptic granular accumulations, no stellate-type deposits were detected. Western blot analysis suggested no obvious differences in PrP(Sc) molecular mass or glycoform pattern in the brains of first- and second-passaged cattle. These findings suggest failures to identify differences in mean incubation period and biochemical and neuropathologic properties of the BSE/JP24 prion between the first and second passages in cattle.
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Affiliation(s)
- H Okada
- Prion Disease Research Center, National Institute of Animal Health, 3-1-5 Kan-nondai, Tsukuba, Ibaraki 305-0856, Japan.
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Nishiyama Y, Yasumatsuya K, Kasai K, Sakase M, Nishino O, Akaike M, Nagase T, Sugimoto M, Ikeda S, Kume S. Effects of supplemental β-carotene with whey on IgA transfer from maternal milk and mucosal IgA induction in neonatal mice and calves. Livest Sci 2011. [DOI: 10.1016/j.livsci.2010.10.007] [Citation(s) in RCA: 10] [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: 12/11/2022]
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Marui T, Funatogawa I, Koishi S, Yamamoto K, Matsumoto H, Hashimoto O, Jinde S, Nishida H, Sugiyama T, Kasai K, Watanabe K, Kano Y, Kato N. The NADH-ubiquinone oxidoreductase 1 alpha subcomplex 5 (NDUFA5) gene variants are associated with autism. Acta Psychiatr Scand 2011; 123:118-24. [PMID: 20825370 DOI: 10.1111/j.1600-0447.2010.01600.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
OBJECTIVE Autism appears to have a strong genetic component. The product of the NADH-ubiquinone oxidoreductase 1 alpha subcomplex 5 (NDUFA5) gene is included in the mitochondrial electron transport chain. METHOD We performed a case-control study of 235 patients with autism and 214 controls and examined three single-nucleotide polymorphisms (SNPs) within this gene in a Japanese population. We then conducted a transmission disequilibrium test (TDT) analysis in 148 autistic trios. RESULTS In the case-control study, two SNPs (rs12666974 and rs3779262) showed a significant association with autism (P=0.00064 and 0.00046 respectively). Furthermore, a haplotype containing these two SNPs showed a significant association (P-global=0.0013, individual haplotype A-A: P=0.010). In TDT analysis, the global and A-A haplotype P-values also indicated significant associations. Minor allele and genotype frequencies were decreased in the autistic subjects. CONCLUSION We found significant association between the NDFA5 gene and autism.
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Affiliation(s)
- T Marui
- Department of Neuropsychiatry, Graduate School of Medicine, University of Tokyo, Tokyo, Japan.
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Saito K, Hayakawa T, Kuwahara NS, Kasai K. Antibacterial Activity and Bond Strength to Enamel of Catechin-Incorporated 4-META/MMA-TBB Resin as an Orthodontic Adhesive Resin. J HARD TISSUE BIOL 2011. [DOI: 10.2485/jhtb.20.203] [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: 10/14/2022]
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Asano M, Yamaguchi M, Nakajima R, Fujita S, Utsunomiya T, Yamamoto H, Kasai K. IL-8 and MCP-1 induced by excessive orthodontic force mediates odontoclastogenesis in periodontal tissues. Oral Dis 2010; 17:489-98. [PMID: 21496183 DOI: 10.1111/j.1601-0825.2010.01780.x] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
OBJECTIVE The aim of this study was to investigate how interleukin (IL)-8 (cytokine-induced neutrophil chemoattractant; CINC-1) and monocyte chemotactic protein (MCP)-1/CCL2 contribute to root resorption during orthodontic tooth movement. MATERIALS AND METHODS Forty 6-week-old male Wistar rats were subjected to orthodontic force of 10 or 50 g to induce a mesially tipping movement of the upper first molars for 7 days. We determined the expressions of CINC-1, CXCR2, and MCP-1 proteins in root resorption area using immunohistochemistry. Furthermore, we investigated the effects of compression forces (CF) on IL-8 and MCP-1 production by human periodontal ligament (hPDL) cells. We observed an effect of chemokine treatment on rat odonto/osteoclasts in dentin slices that recapitulated root resorption. RESULTS The immunoreactivity for CINC-1/CXCR2 and MCP-1 was detected in odontoclasts and PDL fibroblasts by the orthodontic force of 50 g on day 7. CF increased the secretion and the expression of mRNA of IL-8 and MCP-1 from PDL cells in a magnitude-dependent manner. Moreover, CINC-1 and MCP-1 stimulated osteoclastogenesis from rat osteoclast precursor cells. CONCLUSION IL-8 (CINC-1) and MCP-1 may therefore facilitate the process of root resorption because of excessive orthodontic force.
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Affiliation(s)
- M Asano
- Department of Orthodontics, Nihon University School of Dentistry at Matsudo, Chiba, Japan
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Mitsuhashi M, Yamaguchi M, Kojima T, Nakajima R, Kasai K. Effects of HSP70 on the compression force-induced TNF-α and RANKL expression in human periodontal ligament cells. Inflamm Res 2010; 60:187-94. [DOI: 10.1007/s00011-010-0253-x] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Araki T, Kasai K. S12-7 Mismatch negativity in patients with an at risk mental state. Clin Neurophysiol 2010. [DOI: 10.1016/s1388-2457(10)60098-3] [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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Takizawa R, Kasai K, Fukuda M. S52-3 NIRS application to psychiatric diagnosis and clinical evaluation. Clin Neurophysiol 2010. [DOI: 10.1016/s1388-2457(10)60313-6] [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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