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Yoshiyuki Matsuyama,Yoshihiro Sakuma,Miyako Suzuki,Sumihisa Orita,Kazuyo Yamauchi,Gen Inoue,Yasuchika Aoki,Tetsuhiro Ishikawa,Masayuki Miyagi,Hiroto Kamoda,Gou Kubota,Yasuhiro Oikawa,Kazuhide Inage,Ta 대한척추외과학회 2014 Asian Spine Journal Vol.8 No.5
Study Design: Experimental animal study. Purpose: To evaluate pain-related behavior and changes in nuclear factor-kappa B (NF-kB), receptor activator of NF-kB (RANK), and ligand (RANKL) in dorsal root ganglia (DRG) after combined sciatic nerve compression and nucleus pulposus (NP) application in rats. Overview of Literature: The pathological mechanisms underlying pain from lumbar-disc herniation have not been fully elucidated. RANKL are transcriptional regulators of inflammatory cytokines. Our aim was to evaluate pain-related behavior and RANKL expression in DRG after sciatic-nerve compression and application of NP in rats. Methods: Mechanical hyperalgesia and RANKL expression were assessed in three groups of rats: NP+sciatic nerve compression (2 seconds), sham-operated, and controls (n=20 each). Mechanical hyperalgesia was measured every other day for 3 weeks using von Frey filaments. RANKL expression in L5 DRGs was examined at five and ten days after surgery using immunohistochemistry. Results: Mechanical hyperalgesia was observed over the 12-day observation period in the NP+nerve compression group, but not in the control and sham-operated animal groups (p <0.05). RANKL immunoreactivity was seen in the nuclei of L5 DRG neurons, and its expression was significantly upregulated in NP+nerve compression rats compared with control and sham-operated rats (p <0.01). Conclusions: The exposure of sciatic nerves to mechanical compression and NP produces pain-related behavior and up-regulation of RANKL in DRG neurons. RANKL may play an important role in mediating pain after sciatic nerve injury with exposure to NP.
Yawara Eguchi,Satoshi Iida,Chiho Suzuki,Yoshiyuki Shinada,Tomoko Shoji,Kazuhisa Takahashi,Seiji Ohtori 대한척추외과학회 2018 Asian Spine Journal Vol.12 No.2
Study Design: Retrospective observational study. Purpose: We examined change in lumbrosacral spine alignment and low back pain (LBP) following total hip arthroplasty (THA) in patients with severe hip osteoarthritis (OA). Overview of Literature: Severe hip osteoarthritis has been reported to cause spine alignment abnormalities and low back pain, and it has been reported that low back pain is improved following THA. Methods: Our target population included 30 patients (29 female, mean age 63.5 years) with hip OA who underwent direct anterior approach THA. There were 12 cases with bilateral hip disease and 18 cases with unilateral osteoarthritis. Visual analogue scale (VAS) scores for LBP and coxalgia, the Roland-Morris Disability Questionnaire (RDQ), and the Japanese Orthopaedic Association Back Pain Evaluation Questionnaire (JOABPEQ) were assessed before and after surgery. Spinal alignment metrics were measured before and after surgery. Results: VAS for LBP change from preoperative to final postoperative observation was significantly improved (p <0.05), as was VAS for hip pain (p <0.001). RDQ improved significantly (p <0.01). All five domains of JOABPEQ were significantly improved (p <0.05). In terms of coronal alignment, lumbar scoliosis change from preoperative to last observation was significantly reduced (p <0.05). There were no significant changes in the sagittal alignment metrics. In addition, there was a correlation between before and after RDQ difference and before and after lumbar scoliosis difference (p <0.05). VAS for LBP (p <0.05) as well as RDQ (p <0.05) were significantly improved only in unilateral OA. Lumbar scoliosis was significantly improved in cases of unilateral OA (p <0.05), but alignment did not improve in cases of bilateral OA (p =0.29). Conclusions: The present study demonstrates improvements in VAS for LBP, RDQ, and all domains of JOABPEQ. There were also significant reductions in lumbar scoliosis and an observed correlation of RDQ improvement with lumbar scoliosis improvement. We were able to observe improvements in lumbar scoliosis and low back pain only in cases of unilateral OA. It has been suggested that the mechanism of low back pain improvement following THA is related to compensatory lumbar scoliosis improvement.
Yoshida, Yoshiaki,Fujiwara, Koji,Ishihara, Yoshiyuki,Suzuki, Hirokazu Journal of International Conference on Electrical 2014 Journal of international Conference on Electrical Vol.3 No.3
When large penetration of the distributed generators (DGs) such as photovoltaic (PV) systems is growing up in grid system, it is important to quickly prevent islanding caused by power system fault to ensure electrical safety. We propose a novel active method for islanding prevention by harmonic injection synchronized with the exciting current harmonics of the pole transformer to avoid mutual interference between active signals. We confirm the validity of the proposed method by performing the basic tests of islanding by using a current source superimposed the harmonic active signal. Further, we carry out the simulation using PSCAD/EMTDC, and verify the fast islanding detection.
( Norio Akuta ),( Yusuke Kawamura ),( Yasuji Arase ),( Fumitaka Suzuki ),( Hitomi Sezaki ),( Tetsuya Hosaka ),( Masahiro Kobayashi ),( Mariko Kobayashi ),( Satoshi Saitoh ),( Yoshiyuki Suzuki ),( Kenj 대한간학회 2016 Gut and Liver Vol.10 No.3
Background/Aims: It is important to determine the noninvasive parameters of histological features in nonalcoholic fatty liver disease (NAFLD). The aim of this study was to investigate the value of genetic variations as surrogate markers of histological features. Methods: The parameters that affected the histological features of NAFLD were investigated in 211 Japanese patients with biopsy-proven NAFLD. The relationships between genetic variations in PNPLA3 rs738409 or TM6SF2 rs58542926 and histological features were analyzed. Furthermore, the impact of genetic variations that affected the pathological criteria for the diagnosis of nonalcoholic steatohepatitis (NASH) (Matteoni classification and NAFLD activity score) was evaluated. Results: The fibrosis stage of PNPLA3 GG was significantly more progressive than that of CG by multiple comparisons. Multivariate analysis identified PNPLA3 genotypes as predictors of fibrosis of stage 2 or more, but the impact tended to decrease at stage 3 or greater. There were no significant differences among the histological features of the three genotypes of TM6SF2. PNPLA3 genotypes partly affected the definition of NASH by the NAFLD activity score, but TM6SF2 genotypes did not affect the definition of NASH. Conclusions: In Japanese patients with biopsy-proven NAFLD, PNPLA3 genotypes may partly affect histological features, including stage of fibrosis, but the TM6SF2 genotype does not affect histological features. (Gut Liver 2016;10:437-445)