Hitoshi Nagatsuka

Okayama University, Okayama, Okayama, Japan

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Publications (261)412.32 Total impact

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    ABSTRACT: The purpose of the study was to determine the cell dynamics in periodontal ligament in response to mechanical stress during orthodontic movement. Following Waldo's method, a square sheet of rubber dam was inserted in between the first and second maxillary molars in 10 ddY mice leaving the stress load for 3 hours. After 3 days and at 1 week, cell count on pressure and tension sides of the periodontal ligament was determined. Furthermore, the type of cell present after mechanical stress was identified using GFP bone marrow transplantation mouse model. Immunohistochemistry was carried out at 0 min (immediately after mechanical stress), 24 hours, 1 week, 2 weeks and 6 months. Temporal changes in the expression of GFP-positive bone marrow derived cells were examined. Moreover, double immunofluorescent staining was performed to determine the type of cell in the periodontal ligament. Cell count on the tension side tremendously increased 3 days after mechanical stress. At 1 week, spindle and round cell count increased compared to the control group. These changes were observed on both tension and pressure sides. Cell count on pressure side at 3 days (22.11+/-13.98) and at 1 week (33.23+/-11.39) was higher compared to the control group (15.26+/-8.29). On the tension side, there was a significantly increased at 3 days (35.46+/-11.85), but decreased at 1 week (29.23+/-13.89) although it is still higher compared to the control group (AD+/-SD: 10.37+/-8.69). Using GFP bone marrow transplantation mouse model, GFP positive cell count increased gradually over time in 6 months. GFP positive cells were also positive to CD31, CD68 and Runx2 suggesting that fibroblasts differentiated into osteoclasts and tissue macrophages. In conclusion, mechanical stress during orthodontic movement promoted the increase in the number of cells in the periodontal ligament on both tension and pressure sides. The increase in the number of cells in the periodontal ligament is believed to be due to the migration and cell division of undifferentiated mesenchymal cells.
    International journal of medical sciences 08/2015; 12(9):689-694. DOI:10.7150/ijms.12883 · 2.00 Impact Factor
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    ABSTRACT: Maxillary anterior implants are associated with the risk of nasopalatine canal damage. Here we present the case of a 37-year-old man who developed a nasopalatine duct cyst after maxillary implant placement. The patient received an implant 3 months after the extraction of a fractured maxillary right central incisor. At a maintenance visit 9 years after the procedure, he complained of swelling and mild pain in the palatal region of the implant. A panoramic radiograph and computed tomography (CT) scan revealed a large, well-circumscribed, periapical radiolucency surrounding the apical portion of the implant and extending to the nasopalatine duct. We removed the entire lesion without removing the implant. Histopathologic examination of the resected specimen revealed a nasopalatine duct cyst. Accidental contact with the nasopalatine canal during implant surgery may have led to the development of the nasopalatine duct cyst. Careful planning using a preoperative CT scan prior to implant placement may prevent such complications.
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    ABSTRACT: Osteosynthetic bone fixation devices made from composites of uncalcined and unsintered hydroxyapatite (u-HA) particles and poly-L-lactide (PLLA) are widely adopted for clinical use because of their bioresorbability and osteoconductive properties. However, how the plate systems constituting these devices change during long-term use in vivo is unknown. In this study, we present cases of two patients fitted with u-HA/PLLA devices for >5 years after surgery and evaluate the resorption process on the basis of the residual versus the resorbed material. In both cases, the majority of the degraded plates and screws had been replaced by bone. In post-operative three-dimensional (3D) CT imaging, plate and screws were maintained until two years after surgery, and then they were degraded and replaced to bone in 4-6 years after surgery. Examination of the aggregation of hydroxyapatite and decrease in molecular weight suggested that the residual material was in the final stages of resorption. The plate system examined demonstrated stable degradation without foreign body reactions in vivo. Although complete resorption is a lengthy process, it is possible to follow its progress using CT.
    Journal of Hard Tissue Biology 04/2015; 24(2):219-224. DOI:10.2485/jhtb.24.219 · 0.32 Impact Factor
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    ABSTRACT: Immunoglobulin G4-related disease (IgG4-RD) is an inflammatory condition associated with elevated serum IgG4 levels and tissue infiltration by IgG4-expressing plasma cells. We present a case of adenoid cystic carcinoma (ACC) of the submandibular gland with possible involvement of IgG4-RD. The patient was a 59-year-old man presenting with a swollen right submandibular gland. Laboratory tests revealed IgG4 levels of 176mg/dl (reference range: 4.8-105). An initial open biopsy for histological diagnosis showed chronic sialadenitis. The region was monitored on an outpatient basis, and finally the right submandibular was totally resected because malignant tumor could not be excluded. Histological examination of the submandibular gland showed an ACC with lymphocytic infiltration containing many IgG4-positive plasma cells in the tumor stroma. We have described a case that indicated a possible involvement of ACC with IgG4-RD. This allows us to speculate that longstanding IgG4-RD may progress to malignancy or infiltration of IgG4-positive plasma cells through the signals of tumor stimuli. Further investigations are required to determine the potential pathogenic mechanism underlying this unique tumor. This case underscores that caution is needed in the diagnosis of masses with high serum IgG4 levels, as the differential diagnosis includes malignancy. Copyright © 2015 Z. Published by Elsevier Ltd.. All rights reserved.
    International Journal of Surgery Case Reports 01/2015; 68. DOI:10.1016/j.ijscr.2015.01.022
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    ABSTRACT: In recent years, calcium titanate (CaTiO3) and carbon-containing materials have gained much attention in a number of biomedical material researches. To maximize the advantages of both materials, we developed a novel alkoxide method to get ‘‘calcium titanate with calcium carbonate’’ (CaTiO3–CaCO3). Thus, our previous result indicated that calcium carbonate could play a key role in the cell response of CaTiO3 material. In the present study we evaluated the effect of sintering time of CaTiO3–CaCO3 in osteoblastic response of KUSA/A1 cells. We examined the material characterization as well as cellular proliferation and mineralization of KUSA/A1 cells cultured with the materials. The results showed that Ca-TiO3–CaCO3 material sintered during 30 min, has better influ-ence on the bone marrow stromal cells for their proliferation and mineralization compared to CaTiO3-CaCO3 sintered at 2 and 10 h. These results suggest that sintering time could be directly related to the amount of carbon within CaCO3 being crucial in cell response. In conclusion, our preliminary find-ings indicate that CaTiO3–CaCO3 could play a more dominant and favorable effect on cell response when sintered for 30 minutes.
    IFMBE proceedings 01/2015; 49:159-162. DOI:10.1007/978-3-319-13117-7_42
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    ABSTRACT: Mineralization is one of the most important processes in normal bone tissue development and in disease condition. Developing a novel and standardized in vitro model system that can readily monitor both cellular dynamics and mineralization is crucial for better understanding the bone tissue development and growth. Recent studies indicated that the mechanical environment is critical condition in mineralization. We hypothesized that hydrogel with different mechanical stiffness can provide a biomimetic mechanical environment that can modulate bone tissue growth and mineralization. A femur of mouse embryo (E16) was embedded in agarose hydrogel (2-60 kPa) and cultured in osteogenic medium for a week. Micro computed tomography (µCT) results revealed the enhanced mineralization was detected in femur head cultured in the gel condition, while no mineralization in the femur head cultured in control (floating culture) condition. The mineralized region was corresponding to the region of secondary ossification center. Both histological and quantitative analyses indicated that the mineralized region of femur head cultured in 10 kPa gel condition was the highest and the mineralized area was significantly larger than that cultured in 2, 40 and 60 kPa gel condition. Immunofluorescence results indicated that the enhanced mineralization caused by the higher chondrogenic differentiation at that region. This enhancement mainly relating to the mechanical forces not to the oxygen tension was also confirmed. Since this system enhances and shorten the mineralization procedure compared to the conventional 2D or 3D cell culture system, this hydrogel system would be one of the unique models for better understanding the mineralized tissue development.
    Tissue Engineering Part C Methods 11/2014; 21(6). DOI:10.1089/ten.TEC.2014.0475 · 4.64 Impact Factor
  • Cancer Research 10/2014; 74(19 Supplement):596-596. DOI:10.1158/1538-7445.AM2014-596 · 9.33 Impact Factor
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    ABSTRACT: To determine the distribution patterns of bone resorption regulators, receptor activator of nuclear factor κ-B (RANK), RANK ligand (RANKL), and osteoprotegerin (OPG) in recurrent ameloblastoma (RAs) and to clarify their impact on the biologic behavior of these neoplasms. Fifteen paraffin-embedded RA cases were subjected to immunohistochemistry for expression of RANK, RANKL, and OPG. The RANK-RANKL-OPG triad was heterogeneously detected in RA samples. RANK, essential for osteoclast differentiation, was strongly expressed in tumoral epithelium. Conversely, RANKL, an osteoclast activator, was markedly underexpressed, and protein localization was predominantly stromal. OPG, an osteoclastogenesis inhibitory factor, was detected in neoplastic epithelium more than in stroma, suggesting functional inactivation of RANKL. Most RA (n = 12/15; 80%) exhibited a bimolecular spatial expression pattern, the most common being RANK-positive/OPG-positive (n = 8/15; 53.3%). All three proteins showed no significant correlation with the clinical/histopathologic parameters in RA patients (P > .05). The RANK(+)/RANKL(low/-)/OPG(+) phenotype observed in RA suggests an altered local bone metabolism characterized by low bone resorptive activity in these recurrent tumors. Copyright © 2014 Elsevier Inc. All rights reserved.
    Oral Surgery, Oral Medicine, Oral Pathology, Oral Radiology, and Endodontology 09/2014; 119(1). DOI:10.1016/j.oooo.2014.09.017 · 1.46 Impact Factor
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    ABSTRACT: Objective: This study examined whether the occurrence of late neck metastasis in early tongue squamous cell carcinoma can be predicted by evaluating HMGB1 (high mobility group box 1) expression in the primary lesion. Methods: A case-control study was conducted. The cases comprised 10 patients with late neck metastasis. The controls consisted of 16 patients without recurrence. All were examined immunohistochemically for HMGB1 protein expression. The odds ratio for late neck metastasis in relation to HMGB1 was estimated. Results: RESULTS for HMGB1 were dichotomised into positive staining scores (score, 5-7) and negative scores (0-4). Six cases (60 per cent) and four controls (25 per cent) were HMGB1-positive. Although no significant result was seen, compared with HMGB1-negative patients the odds ratio for late neck metastasis in HMGB1-positive patients was 3.8 (95 per cent confidence interval, 0.6-26.5) after adjusting for other factors. Conclusion: In the present study, immunohistochemical study of HMGB1 in early tongue squamous cell carcinoma did not appear to be very useful for predicting occult neck metastasis. Further study is necessary to clarify the relationship between HMGB1 expression and late neck metastasis in early tongue squamous cell carcinoma.
    The Journal of Laryngology & Otology 09/2014; 128(10):1-6. DOI:10.1017/S0022215114001819 · 0.67 Impact Factor
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    ABSTRACT: In recent years, artificial biological materials have been commonly used for the treatment of bone tissue defects caused by trauma, tumors, or surgical stress. Although tricalcium phosphate (TCP) is a promising absorbent bone tissue reconstruction biomaterial, it has been reported that its biocompatibility and osteoconductivity depend on its preparation method and sintering temperature. In addition, although it is thought that the microenvironment produced by the extracellular matrix plays an important role in cell growth and differentiation, there have been few studies on how the geometric structure of artificial biological materials affects cells. In the present study, a new honeycomb TCP scaffold containing through-holes with diameters of 300 µm has been developed. The influence of the sintering temperature on the crystal structure and material properties of the honeycomb TCP scaffold was investigated using scanning electron microscopy and X-ray diffraction. Its biocompatibility and osteoconductivity were also evaluated by implantation into experimental animals. It was found that a β-TCP scaffold sintered at 1200°C exhibited high biocompatibility and osteoconductivity, and when it was loaded with BMP-2, it exhibited both osteoconductivity and osteoinductivity, promoting rapid bone formation in both ectopic and orthotopic areas. It is thus a highly promising bone reconstruction material that is expected to find clinical applications. © 2013 Wiley Periodicals, Inc. J Biomed Mater Res Part A, 2013.
    Journal of Biomedical Materials Research Part A 09/2014; 102(9). DOI:10.1002/jbm.a.34966 · 3.37 Impact Factor
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    ABSTRACT: Conclusion: In tongue squamous cell carcinoma (SCC), high levels of regulatory T-cell (Treg) infiltration in tumor nests are observed in the cases with poor prognosis. Objectives: The role of Tregs in head and neck cancers remains unclear. The aim of this study was to observe the distribution of Tregs in different stages of tongue SCC and estimate the effects on prognosis. Methods: Thirty-four cases with tongue SCC were examined immunohistochemically for CD4, CD8, and Forkhead box P3 (Foxp3). Immunoreactive cells were counted in cancer stroma and nest regions, and relationships between cell numbers and disease-free survival rates were analyzed. Results: In the 34 cases, univariate analysis for disease-free survival indicated high-level infiltration of Tregs (CD4(+)Foxp3+) into both cancer nests and stroma and presence of helper T (CD4(+)Foxp3-) cells in cancer stroma as potential predictors of significantly worse prognosis. In early-stage cases (stage I/II), high-level infiltration of Tregs in cancer nests correlated significantly with poor disease-free survival rate. Multivariate analysis for disease-free survival found no independent variables.
    Acta Oto-Laryngologica 06/2014; 134(8):1-6. DOI:10.3109/00016489.2014.918279 · 1.10 Impact Factor
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    Wuwei Li · Ryo Tamamura · Bo Wang · Qigui Liu · Han Liu · Tingjiao Liu · Naoki Katase · Jing Xiao · Hitoshi Nagatsuka
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    ABSTRACT: Adenoid cystic carcinoma (ACC) is one of the most common salivary gland malignant tumors with a high risk of recurrence and metastasis. Current studies on cancer stem cells (CSCs) have verified that CSCs are the driving force behind tumor initiation and progression, suggesting that new cancer therapies may be established by effectively targeting and killing the CSCs. The primary goal of this study is to investigate the expression patterns of ABCG2, CD133, and podoplanin in ACC of minor salivary glands by immunohistochemistry analysis. We found that ABCG2 was weakly expressed in normal looking salivary gland tissues. A significant upregulation of ABCG2 expression in ACC was observed with a similar expression pattern of Ki-67. CD133 was detected in apical membrane of epithelial cells and podoplanin was expressed positively in myoepithelial cells of both normal looking tissue and ACC. However, no significant difference was found of the expression pattern of CD133 and podoplanin between normal looking tissues and ACC. Our observations suggest that CSCs may exist in quiescent cells with ABCG2 positive staining, which are surrounded by cells with positive expression of ABCG2 and Ki-67 in ACC, and costaining with ABCG2 and Ki-67 may help predict the location of CSCs.
    04/2014; 2014:132349. DOI:10.1155/2014/132349
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    ABSTRACT: Dexmedetomidine, a highly selective agonist of α2-adrenoceptors, is a commonly used sedative; however, a potent anti-inflammatory effect has also been found. In the present study we evaluated the inhibitory effect of locally injected dexmedetomidine on inflammatory responses in the injected region. Local inflammation was induced in the hindpaws of male mice (aged 6-8 weeks) by intraplantar injection of lambda-carrageenin. To offset the central effect of tested agents, different agents were blindly injected into the left and right paws in the pairs of comparison. The effect of dexmedetomidine on edema (increase in paw volume), the accumulation of leukocytes, and production of tumor necrosis factor-α (TNF-α) and cyclooxygenase-2 (COX-2) were evaluated after carrageenin injection, using water displacement plethysmometry, histological imaging, immunohistochemistry, and Western blotting analysis. Furthermore, we also evaluated the effect of yohimbine, a full antagonist of α2-adrenoceptors, and phenylephrine, an agonist of the α1-adrenoceptor, on dexmedetomidine's action on inflammatory responses. Paw volume and amount of leukocytes in the injected region significantly increased after the injection of carrageenin. Similarly, TNF-α and COX-2 production was found in the subcutaneous region injected with carrageenin, 4 hours after injection. Dexmedetomidine significantly inhibited all increases in paw volume, leukocytes, and production of TNF-α and COX-2. Furthermore, yohimbine significantly antagonized the anti-inflammatory effects of dexmedetomidine, whereas phenylephrine did not significantly alter them. The findings suggest that locally injected dexmedetomidine exhibits an anti-inflammatory effect against local acute inflammatory responses, mediated by α2-adrenoceptors.
    Anesthesia and analgesia 02/2014; 118(2):473-80. DOI:10.1213/ANE.0000000000000060 · 3.47 Impact Factor
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    ABSTRACT: We previously reported that dynamic contrast-enhanced MRI parameters and time–signal intensity curves (TICs; also known as contrast index curves) are useful for the differential diagnosis of jawbone lesions. In particular, odontogenic fibroma and ossifying fibroma, which possess similar histopathological features (i.e., a mixture of hard and soft tissue components), display unique TIC patterns, and we consider that the TIC patterns of these lesions reflect their hard and soft tissue components. Therefore, fibrous dysplasia, which contains fibrous tissue and immature isolated trabeculae composed of woven bone, is expected to display an interesting TIC. The purpose of this study was to assess the utility of TICs for differentiating between the abovementioned lesions, which have similar histopathological components.
    Oral Radiology 01/2014; 30(1). DOI:10.1007/s11282-013-0137-1 · 0.46 Impact Factor
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    ABSTRACT: Angiosarcoma is a malignant tumor of endothelial cells. It is a fatal disease because of the high risk of hematogenous metastasis. Angiosarcoma metastatic to the oral and maxillofacial region is extremely rare because angiosarcoma itself is rare. We report a case of angiosarcoma of the scalp that metastasized to the maxillary gingiva with a review the literature. A 72-year-old man was referred to our department in August 2009 because of a hemorrhagic mass in the right maxillary gingiva. The patient had been admitted to our hospital to receive treatment for an angiosarcoma of the scalp. He was aware that the mass was gradually growing during the past 2 months. Intraoral examination revealed a reddish-brown mass, approximately 20 mm in diameter, at the premolar region of the right maxillary gingiva. An X-ray film showed no resorption of the alveolar bone. A biopsy of the mass led to a diagnosis of angiosarcoma of the scalp metastatic to the maxillary gingiva. However, it was impossible to treat the oral metastatic lesion because of deterioration of the lung metastases. Two months later, he died of respiratory insufficiency.
    Nippon Koku Geka Gakkai zasshi 01/2014; 60(3):132-136. DOI:10.5794/jjoms.60.132
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    ABSTRACT: Bone allografts are commonly used for bone regeneration. The aim of this study was evaluate the efficacy of a freeze dried bone matrix (FDBM) in critical size defect (CZD) rat calvaria. Eighteen Wistar female rats (body weight 150 ± 50 g) with CZD (5mm) were divided in two groups: group 1, using freeze dried bone matrix; and group 2, only with coagulum. All samples were evaluated on the 1st, 3rd and 6th weeks post-surgery by soft X-ray, histological and histometric studies. Soft X-ray results showed a radiolucent image with many irregular radiopaque areas. Histologically, bone regeneration was initiated from the 3rd week, when a thin layer of new woven bone could be seen adjacent to the matrix. At the 6th week, lamellar bone covered over half (61.8%) of the defect area. The lack of FDBM resorption allowed its incorporation to the new regenerated bone. This behavior is important in circumstances where it is necessary not only to stimulate bone regeneration but also increase the volume in affected areas, such as during the placement of dental implants. The results obtained in this research are encouraging for the use of freeze dried bone matrix as a bone graft material. © 2014 The Hard Tissue Biology Network Association Printed in Japan, All rights reserved.
    Journal of Hard Tissue Biology 01/2014; 23(2):233-238. DOI:10.2485/jhtb.23.233 · 0.32 Impact Factor
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    Hiroyuki Yanai · Yasuharu Sato · Hitoshi Nagatsuka · Tadashi Yoshino
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    ABSTRACT: Nestin is an intermediate filament that was first identified in neural progenitor cells. It is expressed in various cell types in the nervous system as well as in other systems. In the present study, we investigated nestin expression in non-neoplastic salivary gland tissue and in salivary gland tumors. In non-neoplastic salivary glands, nestin expression was observed in only a few abluminal cells. In contrast, diffuse nestin staining was observed in the abluminal cells of pleomorphic adenoma (11 of 11 cases), basal cell adenoma (7 of 7 cases), and epithelial-myoepithelial carcinoma (2 of 2 cases). The stromal cells in basal cell adenoma also expressed nestin. In adenoid cystic carcinoma (6 of 7 cases) and polymorphous low-grade adenocarcinoma (3 of 3 cases), nestin positive cells were observed focally. Nestin was not detected in Warthin tumor (6 cases), classical acinic cell carcinoma (2 cases), mucoepidermoid carcinoma (5 cases), or salivary duct carcinoma (4 cases). Because the nestin expression pattern in each histological salivary gland tumor type is unique, nestin could be a very useful abluminal cell marker for the diagnosis of salivary gland tumors.
    Pathology International 10/2013; 63(10):496-501. DOI:10.1111/pin.12103 · 1.69 Impact Factor
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    ABSTRACT: Background: Bone marrow-derived cells (BMCs) have abilities of cell migration and differentiation into tissues/organs in the body and related with the differentiation of teeth or periodontal tissue including fibroblasts. Then, we examined the effect of orthodontic mechanical stress to the transplanted BMC migration into periodontal tissues using BMC transplantation model. Material and Method: BMC from green fluorescence protein (GFP) transgenic mice were transplanted into 8-week-old female C57BL/6 immunocompromised recipient mice, which had undergone 10 Gy of lethal whole-body-irradiation. Five mice as experimental group were received orthodontic mechanical stress using separator between first molar (M1) and second molar (M2) 1 time per week for 5 weeks and 5 mice as control group were not received mechanical stress. The maxilla with M1 and M2 was removed and was immunohistochemically analyzed using a Dako Envision + Kit-K4006 and a primary anti-GFP-polyclonal rabbit antibody. Immunohistochemically stained was defined as positive area and the pixel number of positive area in the periodontal tissue was compared with the previously calculated total pixel number of the periodontal tissue. Results: The immunohistochemistry revealed that GFP positive cells were detected in the periodontal tissues, both in the experimental and control specimens. The ratio of pixel number in the examination group showed 5.77 ± 3.24 % (mean ± SD); and that in the control group, 0.71±0.45 % (mean ± SD). The examination group was significantly greater than that of control group (Mann-Whitney U test: p<0.001). Conclusion: These results suggest that orthodontic mechanical stress accelerates transplanted BMC migration into periodontal tissues.
    International journal of medical sciences 08/2013; 10(10):1321-6. DOI:10.7150/ijms.6631 · 2.00 Impact Factor
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    ABSTRACT: Ever since protoporphyrin IX (PpIX) was discovered to accumulate preferentially in cancer cells after 5-aminolevulinic acid (ALA) treatment, photodynamic treatment or therapy (PDT) has been developed as an exciting new treatment option for cancer patients. However, the level of PpIX accumulation in oral cancer is fairly low and insufficient for PDT. Ferrochelatase (FECH) and ATP-binding cassette transporter G2 (ABCG2) are known to regulate PpIX accumulation. In addition, serum enhances PpIX export by ABCG2. We investigated here whether and how inhibitors of FECH and ABCG2 and their combination could improve PpIX accumulation and PDT efficacy in an oral cancer cell line in serum-containing medium. ABCG2 inhibitor and the combination of ABCG2 and FECH inhibitors increased PpIX in the presence of fetal bovine serum (FBS) in an oral cancer cell line. Analysis of ABCG2 gene silencing also revealed the involvement of ABCG2 in the regulation of PpIX accumulation. Inhibitors of FECH and ABCG2, and their combination increased the efficiency of ALA-PDT even in the presence of FBS. ALA-PDT-induced cell death was accompanied by apoptotic events and lipid peroxidation. These results suggest that accumulation of PpIX is determined by the activities of ABCG2 and FECH and that treatment with a combination of their inhibitors improves the efficacy of PDT for oral cancer, especially in the presence of serum.
    Acta medica Okayama 06/2013; 67(3):153-164. · 0.70 Impact Factor

Publication Stats

2k Citations
412.32 Total Impact Points


  • 1991–2015
    • Okayama University
      • • Department of Oral Pathology and Medicine
      • • Department of Gastroenterological Surgery, Transplant, and Surgical Oncology
      • • Medical School
      • • Department of Pathology and Oncology
      Okayama, Okayama, Japan
  • 2009
    • Wakayama Medical University
      • Department of Otolaryngology-Head and Neck Surgery
      Wakayama, Wakayama, Japan
  • 2003–2008
    • Matsumoto Dental University
      • • Graduate School of Oral Medicine
      • • Division of Hard Tissue Research
      • • Department of Oral Pathology
      Shiojiri, Nagano-ken, Japan