76
|
Nakamura F, Higashi T, Asamura H, Sobue T, Ohtani M, Mekata E, Higashide S, Shinkai T, Okamura T. Assessing the quality of lung cancer care in community cancer center hospitals in Japan. J Clin Oncol 2011. [DOI: 10.1200/jco.2011.29.15_suppl.e16570] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
77
|
Okamura T, Kikuchi T, Irie T. PET imaging of MRP1 function in the living brain: method development and future perspectives. Curr Top Med Chem 2011; 10:1810-9. [PMID: 20645911 DOI: 10.2174/156802610792927988] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2010] [Accepted: 01/20/2010] [Indexed: 11/22/2022]
Abstract
Multidrug resistance-associated protein 1 (MRP1) functions as a primary active transporter utilizing energy from ATP hydrolysis. In the central nervous system (CNS), MRP1 plays an important role in limiting the permeation of xenobiotic and endogenous substrates across the blood-brain and blood-cerebrospinal fluid barriers, and across brain parenchymal cells. While MRP1 contributes to minimizing the neurotoxic effects of drugs, it may also restrict the distribution of drugs for the treatment of CNS diseases. Moreover, neurodegenerative disease may be associated with abnormal expression of efflux transporters in the brain. Noninvasive measurement of MRP1 function will therefore be useful for directly evaluating the effect of modulators on enhancing the penetration of drugs into the brain and for examining the pathophysiological role of MRP1 in the brain. Positron emission tomography (PET) is a powerful molecular imaging technique. While several PET probes have been proposed for imaging function of the efflux transporter P-glycoprotein, few reports discuss the probes for imaging MRP1 function in the brain. Ideally, brain radioactivity should consist of a single radioactive compound that is selectively transported by the efflux transporter of interest, without other efflux routes. However, most PET probes for MRP1 or P-glycoprotein are eliminated by both a transporter and simple diffusion, resulting in inaccurate measurement of pump function. This review addresses a new strategy to avoid this problem, and suggests the design of a PET probe based on this strategy, particularly for MRP1 imaging. Several published reports on imaging MRP1 function with PET are also discussed.
Collapse
|
78
|
Okamura T, Hirose Y, Ando R, Nakane A, Akita H. UP-1.20: Effect of increasing the dose of tamsulosin to 0.4 mg on dysuria associated with benign prostatic hyperplasia. Urology 2010. [DOI: 10.1016/j.urology.2010.07.153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
79
|
Yoshino N, Kanekiyo M, Hagiwara Y, Okamura T, Someya K, Matsuo K, Ami Y, Sato S, Yamamoto N, Honda M. Intradermal delivery of recombinant vaccinia virus vector DIs induces gut-mucosal immunity. Scand J Immunol 2010; 72:98-105. [PMID: 20618768 DOI: 10.1111/j.1365-3083.2010.02416.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Antigen-specific mucosal immunity is generally induced by the stimulation of inductive mucosal sites. In this study, we found that the replication-deficient vaccinia virus vector, DIs, generates antigen-specific mucosal immunity and systemic responses. Following intradermal injection of recombinant DIs expressing simian immunodeficiency virus gag (rDIsSIVgag), we observed increased levels of SIV p27-specific IgA and IgG antibodies in faecal extracts and plasma samples, and antibody-forming cells in the intestinal mucosa and spleen of C57BL/6 mice. Antibodies against p27 were not detected in nasal washes, saliva, and vaginal washes. The enhanced mucosal and systemic immunity persisted for 1 year of observation. Induction of Gag-specific IFN-gamma spot-forming CD8(+) T cells in the spleen, small intestinal intraepithelial lymphocytes, and submandibular lymph nodes was observed in the intradermally injected mice. Heat-inactivated rDIsSIVgag rarely induced antigen-specific humoral and T-helper immunity. Moreover, rDIsSIVgag was detected in MHC class II IA antigen-positive (IA(+)) cells at the injection site. Consequently, intradermal delivery of rDIs effectively induces antigen-specific humoral and cellular immunity in gut-mucosal tissues of mice. Our data suggest that intradermal injection of an rDIs vaccine may be useful against mucosally transmitted pathogens.
Collapse
|
80
|
Hamaguchi S, Okamura T, Imagawa S, Obana T, Yanagi N, Mito T. Helium Subcooling System for LHD Helical Coils. FUSION SCIENCE AND TECHNOLOGY 2010. [DOI: 10.13182/fst10-a10845] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
81
|
Takashima N, Miura K, Hozawa A, Okamura T, Hayakawa T, Okuda N, Kadowaki T, Murakami Y, Kita Y, Nakamura Y, Okayama A, Ueshima H. Cigarette smoking in middle age and a long-term risk of impaired activities of daily living: NIPPON DATA80. Nicotine Tob Res 2010; 12:944-9. [DOI: 10.1093/ntr/ntq121] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
|
82
|
Higashi T, Nakamura F, Sugihara K, Ishiguro M, Shinkai T, Muranaka T, Ohtani M, Kondo K, Sobue T, Okamura T. Quality of colorectal cancer care in Japan: A nationwide multicenter study. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e16542] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
|
83
|
Seki R, Ohshima K, Fujisaki T, Uike N, Kawano F, Gondo H, Makino S, Eto T, Moriuchi Y, Taguchi F, Kamimura T, Tsuda H, Shimoda K, Okamura T. Prognostic significance of S-phase kinase-associated protein 2 and p27kip1 in patients with diffuse large B-cell lymphoma: effects of rituximab. Ann Oncol 2010; 21:833-841. [DOI: 10.1093/annonc/mdp481] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
84
|
Okamura T, Akita H, Nishio H, Moritoki Y, Hirose Y, Kato T, Tozawa K, Kohri K. UP-3.039: Intravesical Bacillus Calmette-Guérin (BCG) Instillation for Primary And Recurring T1G3 Bladder Cancers. Urology 2009. [DOI: 10.1016/j.urology.2009.07.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
|
85
|
Gonzalo N, Serruys PW, Okamura T, Shen ZJ, Onuma Y, Garcia-Garcia HM, Sarno G, Schultz C, van Geuns RJ, Ligthart J, Regar E. Optical coherence tomography assessment of the acute effects of stent implantation on the vessel wall: a systematic quantitative approach. Heart 2009; 95:1913-9. [PMID: 19671534 DOI: 10.1136/hrt.2009.172072] [Citation(s) in RCA: 138] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
OBJECTIVE To observe and characterise vessel injury after stenting using optical coherence tomography (OCT), to propose a systematic OCT classification for periprocedural vessel trauma, to evaluate its frequency in stable versus unstable patients and to assess its clinical impact during the hospitalisation period. SETTING Stenting causes vessel injury. DESIGN AND INTERVENTIONS All consecutive patients in whom OCT was performed after stent implantation were included in the study. Qualitative and quantitative assessment of tissue prolapse, intra-stent dissection and edge dissection were performed. RESULTS Seventy-three patients (80 vessels) were analysed. Tissue prolapse within the stented segment was visible in 78/80 vessels (97.5%). Median number of tissue prolapse sites was 8 (IQR 4-19), mean (SD) area 1.04 (0.9) mm(2). Intra-stent dissection flaps were visible in 69/80 vessels (86.3%) (median number 3 (IQR 1.25-6), maximum flap length 450 (220) microm). Fifty-five out of 80 vessels (68.8%) showed dissection cavities (median number 2 (IQR 0-4.75), maximum depth 340 (170) microm). Edge dissection was visible in 20 vessels (mean (SD) length flap 744 (439) microm). The frequency of tissue prolapse or intra-stent dissection was similar in stable and unstable patients (95.6% vs 100%, p = 0.5 for tissue prolapse; 91.1% vs 82.9%, p = 0.3 for intra-stent dissection). There were no events during the hospitalisation period. CONCLUSIONS OCT allows a detailed visualisation of vessel injury after stent implantation and enables a systematic classification and quantification in vivo. In this study, frequency of tissue prolapse or intra-stent dissections after stenting was high, irrespective of the clinical presentation of the patients, and was not associated with clinical events during hospitalisation.
Collapse
|
86
|
Watanabe M, Okamura T, Kokubo Y, Higashiyama A, Okayama A. Elevated serum creatine kinase predicts first-ever myocardial infarction: a 12-year population-based cohort study in Japan, the Suita study. Int J Epidemiol 2009; 38:1571-9. [DOI: 10.1093/ije/dyp212] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
87
|
Okamura T, Ishibashi N, Iwata Y, Zurakowski D, Jonas RA. Aprotinin concentration varies significantly according to cardiopulmonary bypass conditions. Perfusion 2009; 23:355-60. [PMID: 19454564 DOI: 10.1177/0267659109105080] [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
Although aprotinin is partially excreted unchanged in the urine, its primary site of metabolism is in the renal lysosomes following proximal tubule resorption. This study tested the hypothesis that plasma aprotinin concentration varies with cardiopulmonary bypass conditions. Thirty-two piglets (weight 13.2 +/- 1.9 kg) received an aprotinin initial dose of 30,000 KIU/kg, a maintenance infusion of 10,000 KIU/kg/h, with a cardiopulmonary bypass (CPB) prime of 30,000 KIU/kg. Aprotinin infusion was terminated at the end of CPB and stopped during hypothermic circulatory arrest (HCA). Piglets were randomized to four groups (n = 8 per group): HCA, 60-minute period at 15 degrees C; low-flow (LF), 10 mL/kg/min low-flow CPB at 25 degrees C; full flow (FF), full flow CPB at 37 degrees C; control at 37 degrees C without CPB. Blood samples were collected at 7 time points: after induction of anesthesia (baseline), after initial dose, 10, 50 and 115 min after start of CPB, just before end of CPB and 30 min after CPB. Plasma aprotinin levels were determined by modified functional assays. Aprotinin levels in the control group were significantly lower at each point after start of CPB than all groups with CPB (p < .001). In particular, during the reperfusion period, aprotinin levels were higher in HCA and LF groups than FF group (p < .05). Throughout CPB, aprotinin levels in the HCA group remained unchanged (p > .40). Bypass conditions affect plasma aprotinin concentration. Recently reported renal and neurological complications with aprotinin use during CPB may reflect excessive dosing and point to the need for real-time monitoring.
Collapse
|
88
|
Imai S, Yoshida Y, Okamura T, Nagano K, Abe Y, Yoshikawa T, Kamada H, Nakagawa S, Tsunoda S, Tsutsumi Y. The specific effect of 2-methoxyestradiol on lymphatic vascular endothelial cells. DIE PHARMAZIE 2009; 64:214-216. [PMID: 19348346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Lymphatic metastasis of tumors is one of the most important prognostic factors and provides valuable information for decisions on appropriate surgical protocols. Recent studies have demonstrated that lymphangiogenesis of lymphatic vascular endothelial cells into tumors is a key event in lymphatic metastasis. Therefore, control of lymphangiogenesis is a promising strategy for treatment or prevention of tumor metastasis and lymphatic disorders. However, mechanisms of lymphangiogenesis or its specific inhibition are not well-understood. In this study we examined effects of various types of signaling inhibitors on tube formation in human lymphatic microvascular endothelial cells (LECs) and blood microvascular endothelial cells (BECs) in vitro. We found that tube formation of LECs was specifically inhibited by 2-methoxyestradiol (2ME). This observation is of potential benefit in understanding the molecular mechanism of lymphangiogenesis. Furthermore, 2ME could therefore offer specific protection against lymphatic metastasis and lymphangiogenesis-related diseases.
Collapse
|
89
|
Okamura T, Shibuya T, Harada M, Niho Y. Successful treatment of chronic adult T-cell leukemia with ubenimex. Acta Haematol 2009; 87:94-7. [PMID: 1350160 DOI: 10.1159/000204727] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
A 38-year-old Japanese man had suffered from trichophyton infection for several years. The white blood cell count was 20,300/mm3, including 54% abnormal lymphocytes with irregularly convoluted nuclei. Adult T-cell leukemia (ATL) was diagnosed based on proliferation of CD4-positive lymphocytes, positive anti-HTLV-I antibody and monoclonal integration of proviral DNA. By 30 mg/day of ubenimex (Bestatin), the abnormal lymphocytes positive for CD4 in the peripheral blood were gradually reduced. Complete remission was maintained for 9 months without any antineoplastic agents. Ubenimex may have suppressed the growth of ATL cells in this patient. Accordingly, ubenimex may prove useful for treating some patients with chronic-type ATL.
Collapse
|
90
|
Shinohara M, Kosaka S, Okamura T, Yamamoto T. FDG-PET in meningeal lymphomatosis. CASE REPORTS 2009; 2009:bcr2007116129. [DOI: 10.1136/bcr.2007.116129] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
|
91
|
Yoshino N, Kanekiyo M, Hagiwara Y, Okamura T, Someya K, Matsuo K, Ami Y, Sato S, Yamamoto N, Honda M. Mucosal Administration of Completely Non-Replicative Vaccinia Virus Recombinant Dairen I strain Elicits Effective Mucosal and Systemic Immunity. Scand J Immunol 2008; 68:476-83. [DOI: 10.1111/j.1365-3083.2008.02168.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
|
92
|
Sun WY, Xu GC, Okamura T, Ueyama N. Structure diversity and reversible anion exchange properties of metal complexes with tripodal ligand. Acta Crystallogr A 2008. [DOI: 10.1107/s010876730808447x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
93
|
Inoue T, Umemura T, Maeda M, Ishii Y, Okamura T, Tasaki M, Nishikawa A. Safety assessment of dietary administered paprika color in combined chronic toxicity and carcinogenicity studies using F344 rats. Food Chem Toxicol 2008; 46:2689-93. [DOI: 10.1016/j.fct.2008.04.034] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2008] [Revised: 04/21/2008] [Accepted: 04/22/2008] [Indexed: 10/22/2022]
|
94
|
Nagano J, Kono S, Toyomura K, Mizoue T, Yin G, Mibu R, Tanaka M, Kakeji Y, Maehara Y, Okamura T, Ikejiri K, Futami K, Yasunami Y, Maekawa T, Takenaka K, Ichimiya H, Imaizumi N. Personality and Colorectal Cancer: The Fukuoka Colorectal Cancer Study. Jpn J Clin Oncol 2008; 38:553-61. [DOI: 10.1093/jjco/hyn067] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023] Open
|
95
|
Nakamura K, Okamura T, Kanda H, Hayakawa T, Murakami Y, Okayama A, Ueshima H. Medical expenditure for diabetic patients: a 10-year follow-up study of National Health Insurance in Shiga, Japan. Public Health 2008; 122:1226-8. [PMID: 18486163 DOI: 10.1016/j.puhe.2007.12.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2007] [Revised: 11/22/2007] [Accepted: 12/11/2007] [Indexed: 11/17/2022]
|
96
|
Kadowaki S, Okamura T, Hozawa A, Kadowaki T, Kadota A, Murakami Y, Nakamura K, Saitoh S, Nakamura Y, Hayakawa T, Kita Y, Okayama A, Ueshima H. Relationship of elevated casual blood glucose level with coronary heart disease, cardiovascular disease and all-cause mortality in a representative sample of the Japanese population. NIPPON DATA80. Diabetologia 2008; 51:575-82. [PMID: 18197396 DOI: 10.1007/s00125-007-0915-6] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/10/2007] [Accepted: 11/22/2007] [Indexed: 01/14/2023]
Abstract
AIMS/HYPOTHESIS High fasting blood glucose is one of the well-known risk factors for CHD. However, in certain settings, patients cannot always be expected to fast. For example, community screenings for cardiovascular disease (CVD) risk factors in Japan are performed under non-fasting conditions to achieve high participation rates. Thus, we examined a representative cohort of the Japanese population (n=9,444, follow-up period 17.3 years) to clarify whether high casual blood glucose (CBG) can predict CVD mortality. METHODS We defined CBG groups as follows: high CBG >or= 11.1 mmol/l or participants with a history of diabetes mellitus; borderline high, 7.77 <or= CBG<11.1 mmol/l; higher normal, 5.22 <or= CBG<7.77 mmol/l); and lower normal, CBG<5.22 mmol/l. The multivariate-adjusted hazard ratios (HRs) for CHD, CVD and all-cause mortality were calculated. RESULTS The crude CHD mortality rate was 0.84 per 1,000 person-years. Age- and sex-adjusted HRs for CHD mortality were high among participants with CBG levels >or= 7.77 mmol/l, regardless of time since last meal. Multivariate-adjusted HRs (95% CI) of CHD mortality in high and borderline high CBG groups were 2.62 (1.46-4.67) and 2.43 (1.29-4.58), respectively. Similar results were observed for both CVD and all-cause mortality. Even within the normal blood glucose range, each 1 mmol/l increase in CBG was associated with a statistically significant increase in the HR for CVD mortality (1.12, 95% CI 1.02-1.22). Population-attributable fractions of the combined groups of high and borderline high CBG for CHD, CVD and all-cause mortality were 12.0, 4.9 and 3.5%, respectively. CONCLUSIONS/INTERPRETATION Increases in CBG, even within the normal range, predict CVD mortality.
Collapse
|
97
|
Tasaki M, Umemura T, Maeda M, Ishii Y, Okamura T, Inoue T, Kuroiwa Y, Hirose M, Nishikawa A. Safety assessment of ellagic acid, a food additive, in a subchronic toxicity study using F344 rats. Food Chem Toxicol 2008; 46:1119-24. [DOI: 10.1016/j.fct.2007.10.043] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2007] [Revised: 10/05/2007] [Accepted: 10/21/2007] [Indexed: 10/22/2022]
|
98
|
Okamura T, Katayama K, Imaoka K, Uchida Y, Nishikawa M, Fukada S. Erosion Behavior of Carbon Deposition Layers Formed by Hydrogen Plasma Sputtering. FUSION SCIENCE AND TECHNOLOGY 2007. [DOI: 10.13182/fst07-a1562] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|
99
|
Katayama K, Imaoka K, Okamura T, Nishikawa M. Helium and hydrogen trapping in tungsten deposition layers formed by helium plasma sputtering. FUSION ENGINEERING AND DESIGN 2007. [DOI: 10.1016/j.fusengdes.2007.04.026] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
100
|
Katayama K, Okamura T, Imaoka K, Sasaki M, Uchida Y, Nishikawa M, Fukada S. Incorporation of Hydrogen in Carbon-Tungsten Co-Deposition Layers Formed by Hydrogen Plasma Sputtering. FUSION SCIENCE AND TECHNOLOGY 2007. [DOI: 10.13182/fst07-a1561] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
|