101
|
Okamura K, Munkhbat B, Batchimeg B, Tamiya G, Hozumi Y, Suzuki T. Case of a Mongolian child with extensive Mongolian spots in mucopolysaccharidosis type VI: Identification of a novel mutation in the arylsulfatase B gene. J Dermatol 2013; 40:758-9. [DOI: 10.1111/1346-8138.12237] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
102
|
Okamura K, Yonemoto Y, Kaneko T, Kobayashi T, Takeuchi K, Takagishi K. AB0548 The assessment of anti-IL-6 treatments in patients with rheumatoid arthritis using FDG-PET/CT. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.548] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
103
|
Yonemoto Y, Okamura K, Takeuchi K, Matsushita M, Kaneko T, Kobayashi T, Aramaki T, Takagishi K. THU0094 Direct comparison of four biological agents in bio-naïve rheumatoid arthritis patients. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.2059] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
104
|
Yonemoto Y, Okamura K, Takeuchi K, Matsushita M, Kaneko T, Kobayashi T, Aramaki T, Takagishi K. AB0340 Is the concomitant use of methotrexate with tocilizumab necessary in bio-naive rheumatoid arthritis patients? Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.2662] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
105
|
Yonemoto Y, Okamura K, Kaneko T, Kobayashi T, Takeuchi K, Takagishi K. SAT0419 Comparison of 18FDG-PET and MRI of the shoulder in patients with rheumatoid arthritis. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.3365] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
106
|
Yonemoto Y, Okamura K, Kaneko T, Kobayashi T, Takagishi K. SAT0098 Biologics Improves bone Quality Markers in Patients with Rheumatoid Arthritis. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.1824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
107
|
Okamura K, Yonemoto Y, Kaneko T, Kobayashi T, Takeuchi K, Takagishi K. AB1277 The assessment of anti-TNF treatments in patients with rheumatoid arthritis using FDG-PET/CT. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.1273] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
108
|
Yonemoto Y, Okamura K, Kaneko T, Kobayashi T, Takagishi K. THU0132 Comparison of dose escalation of infliximab and the addition of tacrolimus in rheumatoid arthritis patients with an inadequate response to infliximab and methotrexate combination therapy. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.2097] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
109
|
Okamura K, Yonemoto Y, Kaneko T, Kobayashi T, Okura C, Takagishi K. AB0239 The evaluation of rheumatoid synovitis of atlantoaxial joint using fdg-pet/ct. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.2562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
110
|
Okamura K, Yonemoto Y, Kaneko T, Okura C, Kobayashi T, Takagishi K. SAT0494 Evaluation of Conventional Assessment of Tocilizumab Therapy in Patients with Rheumatoid Arthritis using FDG-PET/CT. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2013-eular.2218] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
|
111
|
Kaneko T, Saito Y, Kotani T, Ohnishi H, Murata Y, Yonemoto Y, Okamura K, Matozaki T, Takagishi K. OP0059 Importance of the protein tyrosine phosphatase SHP1 in dendritic cells for prevention of TH1 cell differentiation and autoimmunity: A potential target for the therapy. Ann Rheum Dis 2013. [DOI: 10.1136/annrheumdis-2012-eular.1742] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
112
|
Sawa N, Koga S, Okamura K, Ishibashi N, Zendo T, Sonomoto K. Identification and characterization of novel multiple bacteriocins produced by Lactobacillus sakei D98. J Appl Microbiol 2013; 115:61-9. [PMID: 23594273 DOI: 10.1111/jam.12226] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 03/18/2013] [Accepted: 04/08/2013] [Indexed: 10/26/2022]
Abstract
AIM To characterize novel multiple bacteriocins produced by Lactobacillus sakei D98. METHODS AND RESULTS Lactobacillus sakei D98 isolated from Shubo (rice malt) produced at least three bacteriocins. Using three purification steps, three novel antimicrobial peptides termed sakacin D98a, sakacin D98b and sakacin D98c were purified from the culture supernatant. Amino acid and DNA sequencing analysis revealed that the sakacins D98a, D98b and D98c are novel class IIa-like or class IId bacteriocins. In particular, sakacin D98b has a variant pediocin-box sequence, YANGVXC (with Ala instead of Gly), and a different location for the disulfide bridge (Cys(11) and Cys(18)) from that found in other class IIa bacteriocins. CONCLUSIONS Three novel bacteriocins were identified from Lactobacillus sakei D98. Their antimicrobial spectra and intensities indicate that these sakacins would have different modes of action. In addition, sakacin D98b showed low inhibitory activity against Listeria, probably due to the differences in amino acids and position of the disulfide bridge compared with the other class IIa bacteriocins. SIGNIFICANCE AND IMPACT OF STUDY Sakacins D98a and D98c are novel bacteriocins belonging to class IId bacteriocins. On the other hand, sakacin D98b, a class IIa-like bacteriocin, has a unique internal structure and activity spectrum.
Collapse
|
113
|
Palmer S, Ruospo M, Pellgrini F, Strippoli GFM, Palmer S, Ruospo M, Natale P, Saglimbene V, Pellegrini F, Craig JC, Hegbrant J, Strippoli GFM, Ferraresi M, Pereno A, Castelluccia N, Clari R, Moro I, Colombi N, Di Giorgio G, Barbero S, Piccoli GB, Krishnan M, Bond TC, Brunelli S, Nissenson A, Kara B, Palmer S, Wong G, Craig JC, Strippoli GFM, Hanafusa N, Wakai K, Iseki K, Tsubakihara Y, Ogata S, Bikbov B, Tomilina N, Suleymanlar G, Altiparmak MR, Seyahi N, Trabulus S, Serdengecti K, Huang ST, Shu KH, Kao CH, Palmer S, Ruospo M, Natale P, Johnson DW, Craig JC, Gargano L, Saglimbene V, Pellegrini F, Strippoli GFM, Bernasconi AR, Waisman R, Lapidus A, Montoya P, Heguilen R, Suzuki A, Shoji T, Tsubakihara Y, Hayashi T, Tomida K, Guinsburg A, Thijssen S, Usvyat L, Xiao Q, van der Sande F, Marelli C, Etter M, Marcelli D, Levin N, Wang Y, Kotanko P, Kooman J, Schiller A, Schiller O, Andrei C, Mihaescu A, Olariu N, Anton C, Ivacson Z, Roman V, Berca S, Bansal V, Hwang SJ, Lee JJ, Lin MY, Chang JS, Okamura K, Kishi T, Miyazono M, Ikeda Y, Fukumitsu T, Sanai T, Reyes-Bahamonde J, Raimann J, Usvyat LA, Thijssen S, Van der Sande F, Kooman J, Levin N, Kotanko P, Allehbi AM, Bunani AD, Noor A, Laplante S, Rutherford P, Kulcsar I, Szegedi J, Ladanyi E, Torok M, Reusz G, Kiss I, Sparacino V, Agnello V, Di Gaetano P, Guaiana V, Almasio P, Rainone F, Merlino L, Ritchie JP, Marcatti M, Kalra PA, Toprak O, Quintaliani G, Ranocchia D, Germini F, Notargiacomo A, Ariete ML, Palmer S, Ruospo M, Pellegrini F, Strippoli GFM, Bunani AD, Bunani ED, Herrero Berron JC, Mon C, Ortiz M, Hinostroza J, Cobo G, Gallar P, Ortega O, Rodriguez Villarreal I, Oliet A, Digiogia C, Vigil A, Trigka K, Douzdampanis P, Aggelakou-Vaitsi M, Vaitsis N, Fourtounas K, Vigotti FN, Apostu AL, Boscolo M, Chegui LK, Ferrero S, Gallicchio M, Garassino G, Ionescu A, Portonero I, Tarea CA, Valentino E, Piccoli GB, Sikole A, Trajceska L, Gelev S, Dzekova P, Selim G, Amitov V, Borg Cauchi A, Buhagiar L, Calleja N, Demarco D, Nikitidou O, Liakopoulos V, Michalaki A, Demirtzi P, Christidou F, Papagianni A, Daskalopoulou E, Nikolaidis P, Dombros N, Vassallo DM, Chinnadurai R, Robinson H, Middleton R, Donne R, Saralegui I, Garcia O, Robledo C, Gabilondo E, Ortalda VVO, Tomei PPT, Yabarek TTY, Spatola LLS, Dalla Gassa AADG, Lupo AAL, Barril G, Quiroga JA, Arenas D, Cigarran S, Garcia N, Glez Parra E, Martin A, Bartolome J, Castillo I, Carreno V, Baamonde E, Bosch E, Perez G, Ramirez I, Checa MD, Palmer S, Ruospo M, Pellegrini F, Strippoli GFM, Shifris I, Dudar I, Rudenko A, Gonchar I, Mademtzoglou S, Tsikliras NC, Balaskas EV, Montalto G, Lupica R, Fazio MR, Aloisi C, Donato V, Lucisano S, Buemi M, Trimboli D, Cernaro V, Donia A, Denewar A, Khil M, Dudar I, Khil V, Shifris I. Epidemiology CKD 5D - A. Nephrol Dial Transplant 2013. [DOI: 10.1093/ndt/gft121] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
|
114
|
Okamura K, Yonemoto Y, Arisaka Y, Takeuchi K, Kobayashi T, Oriuchi N, Tsushima Y, Takagishi K. The assessment of biologic treatment in patients with rheumatoid arthritis using FDG-PET/CT. Rheumatology (Oxford) 2012; 51:1484-91. [DOI: 10.1093/rheumatology/kes064] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
|
115
|
Sanai T, Okamura K, Sato K, Rikitake S, Kishi T, Miyazono M, Ikeda Y. Masked hyperthyroidism in a haemodialysis patient successfully treated by potassium iodide. Clin Kidney J 2012; 5:70-2. [PMID: 26069755 PMCID: PMC4400462 DOI: 10.1093/ndtplus/sfr173] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2011] [Accepted: 12/09/2011] [Indexed: 11/14/2022] Open
|
116
|
Mizokami T, Itoh Y, Sato Y, Nunoi K, Okamura K. Isolated adrenocorticotropin deficiency associated with painless thyroiditis: a case report and review of the literature. Kurume Med J 2012; 59:71-7. [PMID: 23823017 DOI: 10.2739/kurumemedj.59.71] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A 53-year-old Japanese man was admitted with a 3-month history of transient headache followed by general fatigue and weight loss. He had a history of ocular myasthenia gravis which had been in remission following thymectomy 30 years ago. He had a small diffuse goiter without tenderness, and was diagnosed as having painless thyroiditis with mild thyrotoxicosis on admission. Endocrinological studies showed he had isolated adrenocorticotropin deficiency. Magnetic resonance imaging of the pituitary gland revealed no abnormalities. His symptoms improved soon after replacement of glucocorticoid. After an episode of hypothyroidism, he spontaneously became euthyroid. It is likely that thyrotoxicosis uncovered adrenal insufficiency that had developed insidiously, and hypoadrenocorticism-induced immunological changes may have triggered the development of painless thyroiditis. Moreover, thymectomy might have facilitated the development of pituitary and thyroid autoimmunity.
Collapse
|
117
|
Kami YN, Chikui T, Okamura K, Kubota Y, Oobu K, Yabuuchi H, Nakayama E, Hashimoto K, Yoshiura K. Imaging findings of neurogenic tumours in the head and neck region. Dentomaxillofac Radiol 2011; 41:18-23. [PMID: 22074867 DOI: 10.1259/dmfr/81000210] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE The aim of this study was to describe the CT, MRI and ultrasonography findings of five cases of neurogenic tumours in the head and neck region. METHODS Five neurogenic tumours were analysed with respect to their CT value, the presence of cystic change, target sign, lobulation, connection to the nerve and vascularity. RESULTS The contrast-enhanced CT (ECT) of the schwannomas demonstrated either a mass with low enhancement (two out of three cases), which reflected the predominant Antoni B components, or a mass with cystic changes, which was an Antoni A-based schwannoma displaying cystic changes (one out of three cases). On MRI, all tumours showed homogeneous and isointense signals for muscle on T₁ weighted images (T₁ WIs). T₂ weighted images (T₂ WIs) and gadolinium (Gd)-enhanced T₁ WIs demonstrated target sign in both schwannomas. Ultrasound examination showed a well-defined, ovoid or round hypoechoic mass. The direct connection to the nerve was demonstrated in two of the five cases. Lobulation was observed in only one of the five cases and cystic changes were observed in one of the five cases. In all of the cases, no vascularity was seen in power Doppler images (PDIs) obtained percutaneously. CONCLUSIONS Low-enhanced areas on ECTs can be specific for schwannomas, which suggests the predominance of Antoni B components. The target sign on T₂ WIs and Gd-enhanced T₁ WIs can be specific, which can be used to differentiate the two different components (Antoni A and Antoni B). The direct connection to the nerve can be a specific finding for neurogenic tumours; however, at present the sensitivity is 40%.
Collapse
|
118
|
Shiomi K, Kiyono T, Okamura K, Uezumi M, Goto Y, Yasumoto S, Shimizu S, Hashimoto N. CDK4 and cyclin D1 allow human myogenic cells to recapture growth property without compromising differentiation potential. Gene Ther 2011; 18:857-66. [PMID: 21490680 DOI: 10.1038/gt.2011.44] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
In vitro culture systems of human myogenic cells contribute greatly to elucidation of the molecular mechanisms underlying terminal myogenic differentiation and symptoms of neuromuscular diseases. However, human myogenic cells have limited ability to proliferate in culture. We have established an improved immortalization protocol for human myogenic cells derived from healthy and diseased muscles; constitutive expression of mutated cyclin-dependent kinase 4, cyclin D1 and telomerase immortalized human myogenic cells. Normal diploid chromosomes were preserved after immortalization. The immortalized human myogenic cells divided as rapidly as primary human myogenic cells during the early passages, and underwent myogenic, osteogenic and adipogenic differentiation under appropriate culture conditions. The immortalized cells contributed to muscle differentiation upon xenotransplantation to immunodeficient mice under conditions of regeneration following muscle injury. We also succeeded in immortalizing cryopreserved human myogenic cells derived from Leigh disease patients following primary culture. Forced expression of the three genes shortened their cell cycle to < 30 h, which is similar to the doubling time of primary cultured human myogenic cells during early passages. The immortalization protocol described here allowed human myogenic cells to recapture high proliferation activity without compromising their differentiation potential and normal diploidy.
Collapse
|
119
|
Golbar HM, Izawa T, Kuwamura M, Fujita D, Okamura K, Yamazaki R, Tagami Y, Sasai H, Yamate J. Cardiac hamartoma in a young squirrel monkey who died suddenly. Vet Pathol 2010; 48:970-4. [PMID: 20971945 DOI: 10.1177/0300985810386466] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
A case of cardiac hamartoma in a 2-month-old squirrel monkey is reported. The monkey showed a loss of appetite and died suddenly. Microscopically, an encapsulated nodular lesion was found at the right atrial wall. The lesion consisted of irregularly shaped, slender myocytes intermingled with a few fibroblasts and collagen fibers. Neither nuclear atypia nor inflammatory cell infiltrate was seen. The constituting cells had stratified striations in the cytoplasm and reacted immunohistochemically for desmin, indicating the nature of myocytes. Based on the above findings, a diagnosis of cardiac hamartoma was made. This is the first case of cardiac hamartoma in this species.
Collapse
|
120
|
Okuzako T, Okamura K, Matsui Y, Nakaya K, Kajikawa Y. Molecular-beam deposition of polycrystalline GaSbAs thin films at a low substrate temperature of 300 °C. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/pssc.201000443] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
121
|
Matsui A, Ohmura H, Asai Y, Takahashi T, Hiraga A, Okamura K, Tokimura H, Sugino T, Obitsu T, Taniguchi K. Effect of amino acid and glucose administration following exercise on the turnover of muscle protein in the hindlimb femoral region of Thoroughbreds. Equine Vet J 2010:611-6. [PMID: 17402492 DOI: 10.1111/j.2042-3306.2006.tb05613.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
REASONS FOR PERFORMING STUDY In man, muscle protein synthesis is accelerated by administering amino acids (AA) and glucose (Glu), because increased availability of amino acids and increased insulin secretion, is known to have a protein anabolic effect. However, in the horse, the effect on muscle hypertrophy of such nutrition management following exercise is unknown. OBJECTIVES To determine the effect of AA and Glu administration following exercise on muscle protein turnover in horses. We hypothesise that administration of AA and Glu after exercise effects muscle hypertrophy in horses, as already shown in man and other animals. METHODS Measurements of the rate of synthesis (Rs) and rate of degradation (Rd) of muscle protein in the hindlimb femoral region of thoroughbred horses were conducted using the isotope dilution method to assess the differences between the artery and iliac vein. Six adult Thoroughbreds received a continuous infusion of L-[ring-2H5]- phenylalanine during the study, the stable period for plasma isotope concentrations (60 min), resting periods (60 min), treadmill exercise (15 min) and recovery period (240 min). All horses were given 4 solutions (saline [Cont], 10% AA [10-AA], 10% Glu [10-Glu] and a mixture with 10% AA and 10% Glu [10-Mix]) over 120 min after exercise, and the Rs and Rd of muscle protein in the hindlimb measured. RESULTS The average Rs during the 75-120 min following administration of 10-Mix was significantly greater than for the other solutions (P<0.05). The second most effective solution was 10-AA, and there was no change in Rs after 10-Glu. CONCLUSIONS Administration of AA following exercise accelerated Rs in the hindlimb femoral region, and this effect was enhanced when combined with glucose, because of increasing insulin secretion or a decreased requirement for AA for energy. POTENTIAL RELEVANCE Further studies are required regarding the effect on muscle hypertrophy of supplementing amino acids and glucose in the feed of exercising horses.
Collapse
|
122
|
Sanai T, Okamura K, Inoue T, Abe T, Tsuruya K, Node K. Ultrasonographic Detection of Thyroid Nodules in Hemodialysis Patients in Japan. Ther Apher Dial 2010; 14:323-7. [DOI: 10.1111/j.1744-9987.2010.00810.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
|
123
|
Hayami H, Nagai S, Sakurai A, Okamura K, Yamada J, Kawakami H, Fujimoto K, Yamaguchi O, Koide Y. Effect of transfusion, leukocyte-depleted blood product on onset of new septic shock and mortality in septic shock. Crit Care 2010. [PMCID: PMC2934328 DOI: 10.1186/cc8607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
124
|
Hayashi M, Okamura K, Koychev E, Furuya Y, Sugeta A, Ota T, Ebisu S. Effects of Rehydration on Dentin Strengthened by Heating or UV Irradiation. J Dent Res 2009; 89:154-8. [DOI: 10.1177/0022034509354564] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Type I collagen, the major organic component of human dentin, plays an important role in regulating the mechanical strength of dentin. Collagen in dentin can be strengthened by heating. We hypothesized that UV irradiation could produce similar strengthening effects and might maintain the strength of dentin after rehydration. Beam-shaped dentin specimens from the crowns of human third molars were subjected to flexural testing. Flexural strengths were two and three times greater than those in the control group after 5 minutes’ UV irradiation and heating to 140°C, respectively. After 30 days of rehydration, the heated specimens reverted to their original strength, whereas the UV specimens were 69% stronger than the original. Raman spectra of dental collagen were unchanged after heating, whereas several peaks, including a C-C bond in a proline ring, were amplified by UV irradiation. It is concluded that dentin strengthened by UV irradiation retains strength after rehydration because of chemical changes in collagen.
Collapse
|
125
|
Sawa N, Okamura K, Zendo T, Himeno K, Nakayama J, Sonomoto K. Identification and characterization of novel multiple bacteriocins produced by Leuconostoc pseudomesenteroides QU 15. J Appl Microbiol 2009; 109:282-91. [PMID: 20070442 DOI: 10.1111/j.1365-2672.2009.04653.x] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
AIM To characterize novel multiple bacteriocins produced by Leuconostoc pseudomesenteroides QU 15. METHODS AND RESULTS Leuconostoc pseudomesenteroides QU 15 isolated from Nukadoko (rice bran bed) produced novel bacteriocins. By using three purification steps, four antimicrobial peptides termed leucocin A (ΔC7), leucocin A-QU 15, leucocin Q and leucocin N were purified from the culture supernatant. The amino acid sequences of leucocin A (ΔC7) and leucocin A-QU 15 were identical to that of leucocin A-UAL 187 belonging to class IIa bacteriocins, but leucocin A (ΔC7) was deficient in seven C-terminal residues. Leucocin Q and leucocin N are novel class IId bacteriocins. Moreover, the DNA sequences encoding three bacteriocins, leucocin A-QU 15, leucocin Q and leucocin N were obtained. CONCLUSIONS These bacteriocins including two novel bacteriocins were identified from Leuc. pseudomesenteroides QU 15. They showed similar antimicrobial spectra, but their intensities differed. The C-terminal region of leucocin A-QU 15 was important for its antimicrobial activity. Leucocins Q and N were encoded by adjacent open reading frames (ORFs) in the same operon, but leucocin A-QU 15 was not. SIGNIFICANCE AND IMPACT OF STUDY These leucocins were produced concomitantly by the same strain. Although the two novel bacteriocins were encoded by adjacent ORFs, a characteristic of class IIb bacteriocins, they did not show synergistic activity.
Collapse
|
126
|
Kamisawa T, Shimosegawa T, Okazaki K, Nishino T, Watanabe H, Kanno A, Okumura F, Nishikawa T, Kobayashi K, Ichiya T, Takatori H, Yamakita K, Kubota K, Hamano H, Okamura K, Hirano K, Ito T, Ko SBH, Omata M. Standard steroid treatment for autoimmune pancreatitis. Gut 2009; 58:1504-7. [PMID: 19398440 DOI: 10.1136/gut.2008.172908] [Citation(s) in RCA: 460] [Impact Index Per Article: 30.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
OBJECTIVE To establish an appropriate steroid treatment regimen for autoimmune pancreatitis (AIP). METHODS A retrospective survey of AIP treatment was conducted in 17 centres in Japan. The main outcome measures were rate of remission and relapse. RESULTS Of 563 patients with AIP, 459 (82%) received steroid treatment. The remission rate of steroid-treated AIP was 98%, which was significantly higher than that of patients without steroid treatment (74%, 77/104; p<0.001). Steroid treatment was given for obstructive jaundice (60%), abdominal pain (11%), associated extrapancreatic lesions except the biliary duct (11%), and diffuse enlargement of the pancreas (10%). There was no relationship between the period necessary to achieve remission and the initial dose (30 mg/day vs 40 mg/day) of prednisolone. Maintenance steroid treatment was given in 377 (82%) of 459 steroid-treated patients, and steroid treatment was stopped in 104 patients. The relapse rate of patients with AIP on maintenance treatment was 23% (63/273), which was significantly lower than that of patients who stopped maintenance treatment (34%, 35/104; p = 0.048). From the start of steroid treatment, 56% (55/99) relapsed within 1 year and 92% (91/99) relapsed within 3 years. Of the 89 relapsed patients, 83 (93%) received steroid re-treatment, and steroid re-treatment was effective in 97% of them. CONCLUSIONS The major indication for steroid treatment in AIP is the presence of symptoms. An initial prednisolone dose of 0.6 mg/kg/day, is recommend, which is then reduced to a maintenance dose over a period of 3-6 months. Maintenance treatment with low-dose steroid reduces but dose not eliminate relapses.
Collapse
|
127
|
Nakamizo A, Inoue T, Kikkawa Y, Uda K, Hirata Y, Okamura K, Yasaka M, Okada Y. Postoperative evaluation of changes in extracranial-intracranial bypass graft using superficial temporal artery duplex ultrasonography. AJNR Am J Neuroradiol 2009; 30:900-5. [PMID: 19193755 DOI: 10.3174/ajnr.a1468] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Extracranial-intracranial (ECIC) bypass grafts have been assessed postoperatively by various neuroradiologic techniques. The aim of this prospective study was to evaluate postoperative changes in ECIC bypass graft by using superficial temporal artery duplex ultrasonography (STDU). Furthermore, this study assessed the ability of STDU to predict cerebrovascular reserve capacity (CVR). MATERIALS AND METHODS Forty-five consecutive patients who underwent ECIC bypass procedure for atherosclerotic internal carotid artery occlusion were enrolled in this prospective study. All patients underwent single-photon emission CT and STDU preoperatively, 14 days after, 3 months after, 1 year after, and 2 years after ECIC bypass. RESULTS The diameter and flow velocities of the ipsilateral superficial temporal artery (STA), and regional cerebral blood flow (rCBF) showed increase during the first 2 weeks and then remained stable, whereas CVR showed a constant improvement up to 2 years after surgery. The STA diameter and mean STA flow velocity correlated significantly with CVR at 1 year after surgery (r2 = 0.1232 and r2 = 0.08716, respectively; P < .05). A cutoff value of 1.8 mm STA diameter was determined as the most reliable value to predict CVR greater than 10% at 1 year after surgery. The positive predictive value was calculated as 96.6%, the negative predictive value as 43.8%, the sensitivity as 75.7%, the specificity as 87.5%, and the likelihood ratio as 6.056. CONCLUSIONS ECIC bypass grafts can be assessed postoperatively in a noninvasive fashion with STDU. This technique provides information regarding patency as well as quantitative assessment of bypass function. Moreover, STDU is useful to predict CVR improvement.
Collapse
|
128
|
Tokuda H, Hosoi T, Hayasaka K, Okamura K, Yoshimi N, Kozawa O. Overexpression of protein kinase C-delta plays a crucial role in interleukin-6-producing pheochromocytoma presenting with acute inflammatory syndrome: a case report. Horm Metab Res 2009; 41:333-8. [PMID: 19048456 DOI: 10.1055/s-0028-1103300] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Pheochromocytomas are tumors that may produce a variety of substances in addition to catecholamines. To date, among several cases of systemic inflammatory syndrome associated with interleukin-6 (IL-6) secretion, IL-6-producing pheochromocytomas, have been reported. However, the mechanism underlying IL-6 oversecretion in these cases has not yet been clarified. This report describes a patient with pheochromocytoma who exhibited pyrexia and marked inflammatory signs including C-reactive protein elevation. The inflammatory symptoms were easily controlled by the administration of loxoprofen, a nonsteroidal anti-inflammatory drug. The plasma concentration of IL-6 and 11-d-TXB(2), a stable metabolite of thromboxane A(2) (TXA(2)), were significantly elevated in parallel with an elevation of norepinephrine in the samples obtained by selective venous sampling. A left adrenalectomy was performed, and the acute inflammatory symptoms naturally diminished without loxoprofen. Cultured tumor cells obtained from the resected specimen spontaneously released IL-6, and indomethacin inhibited the IL-6 release. According to a cDNA microarray analysis, mRNA of protein kinase C-delta (PKC-delta), prostaglandin D synthase, and arachidonate release-relating enzymes were significantly overexpressed in the tumor tissue in comparison to the adjacent nontumor tissue. The constitutive phosphorylation of PKC-delta was observed in the tumor tissue. These results strongly suggest that the systemic inflammatory syndrome in IL-6-producing pheochromocytoma, at least in part, is caused by the overexpression of PKC-delta, resulting in an excess of arachidonate derivatives such as prostaglandins.
Collapse
|
129
|
Koyano W, Okamura K, Ando T, Hasegawa M, Asakawa T. The Effects of Functional Health Status on the Everyday Life of Older People in Japan. ACTA ACUST UNITED AC 2008. [DOI: 10.1111/j.1741-6612.1995.tb00681.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
|
130
|
Hayashi M, Koychev E, Okamura K, Sugeta A, Hongo C, Okuyama K, Ebisu S. Heat Treatment Strengthens Human Dentin. J Dent Res 2008; 87:762-6. [DOI: 10.1177/154405910808700807] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The flexural strength of Type I collagen, the major organic component of human dentin, increases with heat. We hypothesized that human dentin can be strengthened by heating, which may help prevent fracture of non-vital teeth after restoration. Beam-shaped dentin specimens were obtained from the crowns of human third molars. The dentinal tubular orientations were arranged to run parallel or perpendicular to loading surfaces. The flexural and microtensile strengths of dentin in the parallel specimens were 2- to 2.4-fold greater after being heated between 110°C and 140°C for 1 hr. The stress intensity factors at fracture also increased after specimens were heated. The x-ray diffraction analyses suggested that shrinking of the lateral packing of the collagen triple-helices from 14 Å to 11 Å was the probable cause of the strengthening of heated dentin. We conclude that heat treatment strengthens human dentin.
Collapse
|
131
|
Takatsuka Y, Park Y, Okamura K, Mitsuyama S, Saito T, Koh J, Kyono S, Inaji H, Koyama H, Suzuki T. Relationship between estrogen receptor (ER) status and efficacy of postoperative adjuvant chemotherapy with oral tegafur-uracil (UFT) or CMF: subset analysis from a randomized controlled trial (CUBC trial in Japan). EJC Suppl 2008. [DOI: 10.1016/s1359-6349(08)70551-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
|
132
|
Sharif J, Nakamura M, Ito T, Kimura Y, Nagamune T, Mitsuya K, Okamura K. Food Restriction in Pregnant Mice Can Induce Changes in Histone Modifications and Suppress Gene Expression in Fetus. ACTA ACUST UNITED AC 2007:125-6. [DOI: 10.1093/nass/nrm063] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
|
133
|
Kakinuma S, Asahina K, Okamura K, Teramoto K, Tateno C, Yoshizato K, Tanaka Y, Yasumizu T, Sakamoto N, Watanabe M, Teraoka H. Human Cord Blood Cells Transplanted Into Chronically Damaged Liver Exhibit Similar Characteristics to Functional Hepatocytes. Transplant Proc 2007; 39:240-3. [PMID: 17275513 DOI: 10.1016/j.transproceed.2006.10.211] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2006] [Indexed: 01/18/2023]
Abstract
Human umbilical cord blood (CB) cells have many advantages as a source for stem cell transplantation because of immaturity and availability. It has been reported that CB cells transplanted into an injured liver displayed hepatocyte-like phenotypes. However, there have been few studies to characterize CB-derived hepatocyte-like cells (HLCs). In this study, CB cells were transplanted into mice with 2 types of liver damage: transient and chronic damage. We analyzed the expression of hepatic differentiation markers in CB-derived HLCs. In the liver of NOD/SCID mice with transient damage, CB-derived HLCs were detected infrequently at 3 weeks after transplantation. In contrast, in the liver of SCID mice damaged chronically by a urokinase-type plasminogen activator transgene under the control of albumin promotor/enhancer (ALB-uPA/SCID mice), more human HLCs colonized the host liver compared with hosts with transiently damaged livers. The CB-derived HLCs in both the transiently and the chronically damaged liver expressed a few markers of human hepatocytes, whereas the transcripts related to mature hepatic functions, including cytochrome P450s, were detected only in the ALB-uPA/SCID mice. These data indicated that CB cells were able to display a similar phenotype to functional hepatocytes in the recipient liver with chronic damage. CB cells may represent a transplantable source for chronic decompensated liver disease.
Collapse
|
134
|
Nakashima N, Shimizu S, Okamura K, Hahm JS, Kim YW, Han HS, Torata N, Antoku Y, Lee YS, Tanaka M. Development of a broadband telemedical network based on internet protocol in the Asia-Pacific region. Methods Inf Med 2007; 46:709-715. [PMID: 18066423] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
OBJECTIVES To promote the exchange of knowledge and standardization of medical procedures and medical systems in the Asia-Pacific region, we established a medical network with high-quality moving images over broadband Internet lines in February 2003. METHODS Real-time teleconferences and live demonstrations with medical-quality videos, broadcast via the Digital Video Transport System, have been used to teach surgical techniques and other medical procedures across national borders. The Asia-Pacific Advanced Network (APAN) committee in August 2005 formally approved our proposal to establish a medical working group within APAN. The network was expanded by the launch of the Trans-Eurasia Information Network 2 in 2006. By the end of 2006, we had conducted 82 events, in 10 countries in the Asia-Pacific region. The multi-station event has increased every year. RESULTS There have been no serious transmission problems or ethical conflicts so far. With these experiences and current achievements, we hope to extend this advanced network system to the entire Asia-Pacific. CONCLUSION This system is a promising and very useful tool for the standardization of medical system and procedures across national borders. Drawing upon these experiences and current achievements, we hope to extend this advanced network system to the entire Asia-Pacific region.
Collapse
|
135
|
Okamura K, Fujikawa M, Bandai S. [Painless thyroiditis]. NIHON RINSHO. JAPANESE JOURNAL OF CLINICAL MEDICINE 2006; 64:2233-6. [PMID: 17154084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Painless thyroiditis is characterized by painless low-uptake thyrotoxicosis (thyrotoxicosis without hyperthyroidism). Destructive damage of the thyroid has been thought to be the mechanism for self-limited thyrotoxicosis. However, hydrolysis of thyroglobulin must be responsible for the release of excessive thyroid hormone. Low-uptake of iodine and excessive release of thyroid hormone suggest the uncoupling of hormone synthesis and hormone secretion in the thyroid gland. Suppressed serum TSH level, various cytokines or growth factors including TGFbeta1, and thyroglobulin itself may be responsible for the suppressed hormone synthesis. The mechanism for persistent hormone release despite suppressed hormone synthesis should be clarified. Quantitative TSH binding inhibitor immunoglobulin assay is helpful for the differential diagnosis of painless thyroiditis and Graves' hyperthyroidism.
Collapse
|
136
|
Yokoyama Y, Moriya T, Takano T, Shoji T, Takahashi O, Nakahara K, Yamada H, Yaegashi N, Okamura K, Izutsu T, Sugiyama T, Tanaka T, Kurachi H, Sato A, Tase T, Mizunuma H. Clinical outcome and risk factors for recurrence in borderline ovarian tumours. Br J Cancer 2006; 94:1586-91. [PMID: 16685277 PMCID: PMC2361313 DOI: 10.1038/sj.bjc.6603139] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
We investigated the long-term prognosis of borderline ovarian tumours and determined risk factors for recurrence. One hundred and twenty-one borderline ovarian tumours treated between 1994 and 2003 at the participating institutions in the Tohoku Gynecologic Cancer Unit were retrospectively investigated for clinical stage, histopathological subtype, surgical technique, postoperative chemotherapy, the presence or absence of recurrence, and prognosis. The median follow-up period was 57 months (1-126 months). One hundred and nine cases (90.6%) were at clinical stage I. The histopathological subtypes consisted of 91 cases of mucinous tumour (75.2%), 27 cases of serous tumour (22.3%), and three cases of endometrioid tumour. Conservative surgery was used in 53 cases (43.8%), radical surgery in 68 cases (56.2%), a staging laparotomy in 43 cases (35.5%), and postoperative adjuvant therapy in 30 cases (24.8%). Recurrence was found in eight cases, but no tumour-related deaths were reported. Although no significant difference in disease-free survival rate was seen between different clinical stages, the difference in disease-free survival rate between serous and non-serous (mucinous and endometrioid) types was significant (P<0.05). The 10-year disease-free survival rate was 89.1% for the radical surgery group and 57.4% for the conservative surgery group -- this difference was significant (P<0.05). In the conservative surgery group, cystectomy and serous tumour were independent risk factors for recurrence. Although recurrence was observed, the long-term prognosis of borderline ovarian tumour was favourable, without tumour-related deaths. Considering the favourable prognosis, conservative surgery can be chosen as far as the patient has a non-serous tumour and receive adnexectomy. However, in cases of serous type and/or receiving cystectomy special care should be given as relative risk rates of recurrence elevate by 2-4-folds.
Collapse
|
137
|
Imazu M, Nakamura Y, Nakatani H, Kaneda H, Okamura K, Sato O, Hayase Y. Cervicothoracic malignant peripheral nerve sheath tumor in a 12-year-old girl with neurofibromatosis type 1. Eur J Pediatr Surg 2006; 16:285-7. [PMID: 16981098 DOI: 10.1055/s-2006-924339] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
We encountered a 12-year-old girl with neurofibromatosis type 1 (NF1) who developed a low-grade cervicothoracic malignant peripheral nerve sheath tumor (MPNST). Computed tomography of the neck showed an elastic firm tumor measuring 7 x 6 x 4 cm and arising from the upper mediastinum. She had no pain or neurological symptoms, but the tumor enlarged to ca. 8 x 8 x 4 cm over the following 7 months. Although we had diagnosed a neurofibroma by preoperative incisional biopsy, the resected tumor showed low-grade MPNST in the central portion of the tumor. In treating a tumor in a patient with NF1, we must recognize that partial biopsies do not necessarily establish a definitive diagnosis and that a growing tumor may indicate malignant transformation.
Collapse
|
138
|
Sasaki MS, Endo S, Ejima Y, Saito I, Okamura K, Oka Y, Hoshi M. Effective dose of A-bomb radiation in Hiroshima and Nagasaki as assessed by chromosomal effectiveness of spectrum energy photons and neutrons. RADIATION AND ENVIRONMENTAL BIOPHYSICS 2006; 45:79-91. [PMID: 16807767 DOI: 10.1007/s00411-006-0051-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2006] [Accepted: 05/08/2006] [Indexed: 05/10/2023]
Abstract
The effective dose of combined spectrum energy neutrons and high energy spectrum gamma-rays in A-bomb survivors in Hiroshima and Nagasaki has long been a matter of discussion. The reason is largely due to the paucity of biological data for high energy photons, particularly for those with an energy of tens of MeV. To circumvent this problem, a mathematical formalism was developed for the photon energy dependency of chromosomal effectiveness by reviewing a large number of data sets published in the literature on dicentric chromosome formation in human lymphocytes. The chromosomal effectiveness was expressed by a simple multiparametric function of photon energy, which made it possible to estimate the effective dose of spectrum energy photons and differential evaluation in the field of mixed neutron and gamma-ray exposure with an internal reference radiation. The effective dose of reactor-produced spectrum energy neutrons was insensitive to the fine structure of the energy distribution and was accessible by a generalized formula applicable to the A-bomb neutrons. Energy spectra of all sources of A-bomb gamma-rays at different tissue depths were simulated by a Monte Carlo calculation applied on an ICRU sphere. Using kerma-weighted chromosomal effectiveness of A-bomb spectrum energy photons, the effective dose of A-bomb neutrons was determined, where the relative biological effectiveness (RBE) of neutrons was expressed by a dose-dependent variable RBE, RBE(gamma, D (n)), against A-bomb gamma-rays as an internal reference radiation. When the newly estimated variable RBE(gamma, D (n)) was applied to the chromosome data of A-bomb survivors in Hiroshima and Nagasaki, the city difference was completely eliminated. The revised effective dose was about 35% larger in Hiroshima, 19% larger in Nagasaki and 26% larger for the combined cohort compared with that based on a constant RBE of 10. Since the differences are significantly large, the proposed effective dose might have an impact on the magnitude of the risk estimates deduced from the A-bomb survivor cohort.
Collapse
|
139
|
Premyslova M, Chisaka H, Okamura K, Challis JRG. IL-1β Treatment Does not Co-ordinately Up-regulate mPGES-1 and COX-2 mRNA Expression, but Results in Higher Degree of Cellular and Intracellular Co-localization of their Immunoreactive Proteins in Human Placenta Trophoblast Cells. Placenta 2006; 27:576-86. [PMID: 16183115 DOI: 10.1016/j.placenta.2005.07.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2005] [Revised: 07/11/2005] [Accepted: 07/12/2005] [Indexed: 12/01/2022]
Abstract
PGE2 is involved in initiation and progression of labor in many species. Biosynthesis of PGE2 is mediated by cyclooxygenases (COX) and prostaglandin E synthases (PGES). mPGES-1 and COX-2 form an inducible pathway for PGE2 production in many cell systems. In this study we investigated whether mPGES-1 is involved in cytokine induced PGE2 biosynthesis in human trophoblast cells. We have evaluated the cellular and intracellular co-localization of mPGES-1 and COX-2, as well as cPGES and COX-1 in human trophoblast cells by dual immunofluorescent staining. The effect of IL-1beta on mPGES-1 and COX-2 co-localization, such as would occur with infection, and the regulatory effects of pro-inflammatory cytokines IL-1beta and TNF-alpha on transcriptional activity of mPGES-1 and COX-2 in these cells were also studied. We found that in cultured unstimulated trophoblasts, some cells expressed predominantly either mPGES-1 or COX-2, though there were cells co-expressing both enzymes. With IL-1beta treatment, mPGES-1 and COX-2 became more consistently co-localized. mPGES-1 was not transcriptionally co-induced with COX-2 by the cytokine treatment. We conclude that mPGES-1 is not involved in the inducible COX-2 mediated pathway for PGE2 biosynthesis at the transcriptional level, however, the treatment with IL-1beta results in a higher degree of co-ordination of the mPGES-1 and COX-2 protein immunolocalization, eliciting PGE2 synthesis.
Collapse
|
140
|
Okamura K, Fujikawa M, Bandai S. [Destructive thyroiditis]. NIHON RINSHO. JAPANESE JOURNAL OF CLINICAL MEDICINE 2006; Suppl 1:422-5. [PMID: 16776180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
|
141
|
Shimizu M, Osa N, Okamura K, Yoshiura K. CT analysis of the Stafne's bone defects of the mandible. Dentomaxillofac Radiol 2006; 35:95-102. [PMID: 16549436 DOI: 10.1259/dmfr/71115878] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE To investigate the aetiology of Stafne's bone defects by analysing the CT findings of two types of defects, which appeared differently on panoramic radiographs. METHODS 32 lesions with suspicion of the Stafne's bone defect on a panoramic radiograph were categorised into two groups: typical "Stafne type", which showed the connection to the base of the mandible, and non-typical "Cyst type", which showed no connection. Age, sex, the existence of hypertension and the following CT findings: location, size and inner content of the defect, existence of expansion of the buccal cortical bone, and location of submandibular glands, were analysed. RESULTS There were 14 "Stafne type" and 17 "Cyst type" on the panoramic radiographs. One lesion in the "Cyst type" was a true cystic lesion and was excluded from further review. The "Stafne type" was seen primarily in the posterior and inferior locations, while the "Cyst type" was seen in the anterior and superior locations on the CT. The size of the defect was significantly larger in the "Stafne type". Buccal cortical expansion was observed only in three lesions in the "Stafne type". While the "Cyst type" contained mainly fatty tissue, the "Stafne type" contained other soft tissues. Though the submandibular glands on the defect side were located anteriorly in both types compared with those on the contralateral side and on the control patients, they spread mainly outwards in the "Stafne type". CONCLUSION The Stafne's bone defects are thought to be caused by the dislocated submandibular gland. The differences between the two types might occur as a result of a different location of the submandibular gland.
Collapse
|
142
|
Okamura K, Ito T. Lessons from comparative analysis of species-specific imprinted genes. Cytogenet Genome Res 2006; 113:159-64. [PMID: 16575176 DOI: 10.1159/000090828] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2005] [Accepted: 09/01/2005] [Indexed: 11/19/2022] Open
Abstract
Genomic imprinting is generally believed to be conserved in all mammals except for egg-laying monotremes, suggesting that it is closely related to placental and fetal growth. As expected, the imprinting status of most imprinted genes is conserved between mouse and human, and some are imprinted even in marsupials. On the other hand, a small number of genes were reported to exhibit species-specific imprinting that is not necessarily accounted for by either the placenta or conflict hypotheses. Since mouse and human represent a single, phylogenetically restricted clade in the mammalian class, a much broader comparison including mammals diverged earlier than rodents is necessary to fully understand the species-specificity and variation in evolution of genomic imprinting. Indeed, comparative analysis of a species-specific imprinted gene Impact using a broader range of mammals led us to propose an alternative dosage control hypothesis for the evolution of genomic imprinting.
Collapse
|
143
|
Nakano H, Oba K, Saito Y, Ouchi M, Yamashita N, Okamura K, Takai E, Mizuno S, Matsumura N, Inuzuka Y, Suzuki T. Asymptomatic Pyuria in Diabetic Women. J Urol 2006. [DOI: 10.1016/s0022-5347(05)00551-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
144
|
Okamura K, Miura S, Tanigawa H, Uehara Y, Zhang B, Saku K. Tu-P10:492 Anti-oxidative effect of azelnidipine as evaluated by analytical capillary isotachophoresis. ATHEROSCLEROSIS SUPP 2006. [DOI: 10.1016/s1567-5688(06)81193-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
|
145
|
Okamura K, Miura S, Zhang B, Kumagai K, Saku K. Mo-P4:241 LDL-associated platelet-activating factor acetylhydrolase may be therapeutic target for preventing atrial fibrillation. ATHEROSCLEROSIS SUPP 2006. [DOI: 10.1016/s1567-5688(06)80374-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
|
146
|
Shimizu S, Nakashima N, Okamura K, Hahm JS, Kim YW, Moon BI, Han HS, Tanaka M. International transmission of uncompressed endoscopic surgery images via superfast broadband Internet connections. Surg Endosc 2005; 20:167-70. [PMID: 16333545 DOI: 10.1007/s00464-005-0282-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2005] [Accepted: 07/29/2005] [Indexed: 10/25/2022]
Abstract
BACKGROUND Although telecommunication is increasing in popularity, poor-quality images sent through a narrowband network limit its use in the medical field. METHODS Kyushu University Hospital in Japan and four hospitals in Korea were linked via superfast broadband Internet connection. The digital video transfer system, which can transmit digital videos without loss of image quality, was used, and the bandwidth was 30 Mbps per line. RESULTS Of the 16 teleconferences conducted, 6 demonstrated real-time endoscopic surgery. In addition to the surgical images, preoperative diagnostic images, images of the operating room, and images of the staff in the conference room were transmitted to facilitate discussion. The network remained stable, and the sound delay was restricted to less than 0.3 s. In the other 10 teleconferences, recorded video images were used for discussion. CONCLUSIONS The authors have established a high-quality, practical teleconference system that is economical and easy to use in clinical practice. This system shows promise for remote education beyond geographic borders.
Collapse
|
147
|
Norisuye K, Okamura K, Sohrin Y, Hasegawa H, Nakanishi T. Large volume preconcentration and purification for determining the240Pu/239Pu isotopic ratio and 238Pu/239+240Pu alpha-activity ratio in seawater. J Radioanal Nucl Chem 2005. [DOI: 10.1007/s10967-006-0026-8] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
148
|
Takano T, Akahira J, Moriya T, Murakami T, Tanaka M, Goto M, Niikura H, Ito K, Mikami Y, Okamura K, Yaegashi N. Primary ependymoma of the ovary: a case report and literature review. Int J Gynecol Cancer 2005; 15:1138-41. [PMID: 16343197 DOI: 10.1111/j.1525-1438.2005.00187.x] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
Ependymoma is a glioma with differentiation toward ependymal cells that usually arises in the central nervous system. Ovarian ependymoma is extremely rare, and the treatment strategies for this disease have not been established. This is the first report of a patient with advanced ovarian ependymoma who received fertility-sparing surgery and is now alive without disease. A 23-year-old Japanese woman, gravida 0, presented with a chief complaint of lower abdominal distension and weight loss. She underwent left salpingo-oophorectomy for suspected ovarian cancer. Microscopic examination revealed a highly cellular tumor composed of small cells with hyperchromatic, round-to-oval nuclei and scanty cytoplasm. Perivascular pseudorosettes, ependymal rosettes, and extensive necrosis were observed. After thorough pathologic examination, she was diagnosed as having stage IIIC ovarian ependymoma. Postoperatively, she received adjuvant chemotherapy and underwent secondary cytoreductive surgery that preserved the uterus and right ovary. Her menstrual cycle has resumed, and she is alive without evidence of disease 16 months after the start of treatment. Although rare, primary ovarian ependymoma must be kept in mind in the differential diagnosis of ovarian tumors, especially in young women. Administration of etoposide-based chemotherapy along with cytoreductive surgery is a potential standard treatment for advanced ovarian ependymoma.
Collapse
|
149
|
Yoshiura K, Okamura K, Tokumori K, Nakayama E, Chikui T, Goto TK, Shimizu M, Kawazu T. Correlation between diagnostic accuracy and perceptibility. Dentomaxillofac Radiol 2005; 34:350-2. [PMID: 16227477 DOI: 10.1259/dmfr/13550415] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVES To correlate diagnostic accuracy for proximal caries with perceptibility of low contrast image details using regression analysis. The other purpose was to determine the attenuation range required for proximal caries diagnosis. METHODS The results of the two types of observer performance tests described above were retrieved from previous studies. Recording media included in those studies were the Compuray and the Dixel, direct digital radiographic systems, and Ektaspeed Plus film. The average numbers of perceptibility of image details from five observers were calculated for each step and for every combination of contiguous steps of the aluminium test phantom from the perceptibility test. The average diagnostic accuracy for proximal caries from the same five observers was correlated with the total number of perceptible details from the phantom using regression analysis. Finally, attenuation range required for proximal caries diagnosis was calculated from the attenuation range of the phantom where the maximum correlation coefficient was obtained. RESULTS Maximum correlation (r=0.68) was obtained at the combination of five contiguous steps of the aluminium test phantom. Attenuation range required for proximal caries diagnosis corresponded to the 2 mm to 6 mm thickness of aluminium with acrylic block of 12 mm thickness. CONCLUSIONS There is a correlation between perceptibility of low contrast image details and diagnostic accuracy for proximal caries. There may be a possibility to simplify observer performance tests for proximal caries diagnosis by using the standardized phantom simulating its attenuation range.
Collapse
|
150
|
Yoshiura K, Nakayama E, Shimizu M, Goto TK, Chikui T, Kawazu T, Okamura K. Effects of the automatic exposure compensation on the proximal caries diagnosis. Dentomaxillofac Radiol 2005; 34:140-4. [PMID: 15897283 DOI: 10.1259/dmfr/88681265] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
Abstract
OBJECTIVE To elucidate the effect of automatic exposure compensation (AEC) on the diagnostic accuracy of proximal caries by comparing several digital intraoral imaging systems with a film. MATERIALS AND METHODS Twenty-seven extracted teeth served as proximal caries samples. Three digital radiographic systems; the Compuray, the Dixel, and the Sens-A-Ray without scintillator layer, and Kodak Ekta-speed Plus films were used as recording media. Radiographs of the teeth samples were obtained with each recording medium under seven to eight different exposures including the optimum level. Six oral radiologists evaluated the possibility of proximal caries with the five-grade-confidence-scale. On digital radiographs, image manipulations were allowed after the initial assessment. Receiver operating characteristic (ROC) curves were obtained at each exposure in each recording medium. The area under the ROC curve (Az) was used as the representative value of diagnostic accuracy. Diagnostic accuracy (DA) curves were obtained by plotting averaged Az values from all observers as a function of incident exposure in each system. RESULTS The effect of exposure variation on the DA was slight in the film while it was significantly larger in the digital systems without AEC. Among digital systems, the effect of exposure variation was smaller in the system with AEC than those without AEC. There was no significant effect on the diagnostic accuracy even if digital image manipulation was employed. CONCLUSION AEC minimizes the decrease of DA due to inadequate exposures. Since it compensates for the narrow exposure range in the digital intraoral sensor systems, the system with AEC may be preferable for the clinical diagnostic tasks.
Collapse
|