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- 저자 : Masaaki Murata (검색결과 4 건)
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( Kazumoto Murata ),( Masaya Sugiyama ),( Tatsuji Kimura ),( Sachiyo Yoshio ),( Tatsuya Kanto ),( Mai Asano ),( Yoshihiko Aoki ),( Tsutomu Takeda ),( Masaaki Korenaga ),( Masatoshi Imamura ),( Naohiko 대한간학회 2013 춘·추계 학술대회 (KASL) Vol.2013 No.1
Background: Genetic variation of interleukin-28B (IL28B), encoding IFN-l3, predict non-responders to pegylated interferon-α/ ribavirin (Peg-IFN/RBV) therapy in chronic hepatitis C (CHC). However, it remains unknown whether IL28B is a functional phenotype, and why it failed to predict treatment responses at 20%. Methods: Message and protein levels of IFN-l3 induced by ex vivo stimulation of peripheral blood mononuclear cells (PBMC) with toll-like receptor agonists (TLR3; poly I: C, TLR7; R-837) were measured by quantitative real-time PCR and our newly developed chemiluminescence enzyme immunoassays, and compared with the clinical data. BDCA-3 or -4+dendritic cells (DC) was negatively or positively selected by Magnet-Associated Cell Sorting. Results: We firstly found that BDCA-4+DCs were the main producers of IFN-ls when stimulated with R-837 whereas BDCA-3+DCs were main producers of IFN-ls when stimulated with poly I: C, using PBMC from healthy volunteers. We also found that detectable levels of IFN-ls were inducible using small amount of PBMC by R-837, not poly I: C. When stimulated with R-837, IFN-l3 was more robustly up-regulated in the PBMC from CHC patients with favorable genotype (TT in rs8099917, n = 59) for the response to Peg-IFN/RBV than non-TT (n = 41) whereas no differences was observed in IFN-l1 or IFNl2, which may support our GWAS data. Importantly, protein levels of IFN-l3 induced by R-837 clearly differentiated the response to Peg-IFN/RBV treatment (p = 1.0×10-10), including discrepant cases such as VR in patients with TG/GG or NVR in TT genotype. Our method more accurately predicted treatment efficacies (95.7%) than IL28B genotyping (65.2%) did. Conclusions: Genetic variations in IL28B basically affect IFNl3 production, but different amount of IFN-l3 production determines the outcomes of Peg-IFN/RBV treatment. This study, for the first time, presents compelling evidence that genetic variations in IL28B confer a functional phenotype. Our method may provide more accurate prediction for the efficacy of Peg-IFN/RBV.
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An Assessment of GPS-Based Precise Point Positioning of the Low Earth-Orbiting Satellite CHAMP
Takahiro Yoshioka,Masaaki Murata 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Precise point positioning (PPP) with the international GNSS service (IGS) products, which consist of precise orbits and clock correction information, has been demonstrated by several investigators to achieve a centimeter-decimeter level positioning accuracy in real-time for land and aerial vehicular navigation. The purpose of this paper is to present one phase of study conducted at National Defense Academy (NDA) on performance evaluation when such a PPP technique is extended for orbit determination of the low Earth orbiters (LEO) in post-flight processing or even in real-time. In the present study the satellite CHAMP was selected as an LEO since high accuracy orbit is prerequisite to that mission. A PPP filter with a simple white noise plant model was designed, and a basic PPP software which was originally developed at NDA for land and aerial vehicles was intensively modified to process GPS data taken by the dual-frequency receiver “BlackJack” onboard the CHAMP satellite. To generate a reference orbit of CHAMP, we proposed a hybrid orbit determination (OD) method consisting of classical least-squares and Hill-Clohessy-Wildshire (HCW) solution, where a least-squares point positioning solution of 3-D coordinates from pseudoranges of CHAMP was employed as the pseudo-observations. It was shown that our PPP filter produced an overall positioning accuracy of better than a sub-meter for transverse and normal components and 90 cm for radial component for 3-hour data arc, and in particular of a few decimeters for each component over the last one-hour segment of good-quality data (no data gap), the implication of the precision real-time on-orbit satellite navigation using only a single, dual-frequency GPS receiver, along with the prediction portion of IGS rapid or ultra-rapid products.
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Shinji Tanishima,Tokumitsu Mihara,Atsushi Tanida,Chikako Takeda,Masaaki Murata,Toshiaki Takahashi,Koji Yamane,Tsugutake Morishita,Yasuo Morio,Hiroyuki Ishii,Satoru Fukata,Yoshiro Nanjo,Yuki Hamamoto,T 대한척추외과학회 2019 Asian Spine Journal Vol.13 No.3
Study Design: Multicenter, prospective study. Purpose: To investigate the effects of diabetes mellitus (DM) on surgical outcomes in patients with cervical myelopathy. Overview of Literature: To date, few studies have investigated the influence of postoperative blood glucose or glycated hemoglobin (HbA1c) levels on surgical outcomes. Methods: The participants were patients who underwent surgery for the treatment of cervical spondylotic myelopathy and ossification of the posterior longitudinal ligament. The 61 cases were evaluated preoperatively and 1 year postoperatively using the Japanese Orthopaedic Association (JOA) scores and the JOA Cervical Myelopathy Evaluation Questionnaire (JOACMEQ). The study variables included fasting blood glucose and HbA1c levels measured preoperatively and at 1 week, 4 weeks, and 1 year postoperatively; the F-wave conduction velocity, latency, rate of occurrence, and M-wave latency in the ulnar and tibial nerves were measured preoperatively and at 1 year postoperatively. The patients were divided into a group without diabetes (N group, 42 patients) and a group with diabetes (DM group, 19 patients). We then assessed the associations between the surgical outcomes and each of the study variables. Results: JOA scores significantly improved in both groups; however, no significant between-group differences were found. There was no significant improvement in the JOACMEQ scores, which assessed cervical function, upper and lower limb function, and bladder function in both groups. We then subdivided the DM group into those with a good control of HbA1c after 1 year (DMG group, 12 patients) and those with HbA1c deterioration after 1 year (DMB group, seven patients), prior to comparing the surgical outcomes. The JOACMEQ scores for upper and lower limb function significantly improved in the DMG group (p<0.01). Compared with the DMB group, there were no significant increases in upper or lower limb function scores in the DMG group. Conclusions: Poor glycemic control might prevent postoperative functional recovery of the spinal cord.
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