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Kaido T, Ogawa K, Fujimoto Y, Ogura Y, Hata K, Ito T, Tomiyama K, Yagi S, Mori A, Uemoto S. Impact of sarcopenia on survival in patients undergoing living donor liver transplantation. Am J Transplant 2013; 13:1549-56. [PMID: 23601159 DOI: 10.1111/ajt.12221] [Citation(s) in RCA: 270] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2012] [Revised: 02/07/2013] [Accepted: 02/09/2013] [Indexed: 02/06/2023]
Abstract
Skeletal muscle depletion, referred to as sarcopenia, predicts morbidity and mortality in patients undergoing digestive surgery. However, the impact on liver transplantation is unclear. The present study investigated the impact of sarcopenia on patients undergoing living donor liver transplantation (LDLT). Sarcopenia was assessed by a body composition analyzer in 124 adult patients undergoing LDLT between February 2008 and April 2012. The correlation of sarcopenia with other patient factors and the impact of sarcopenia on survival after LDLT were analyzed. The median ratio of preoperative skeletal muscle mass was 92% (range, 67-130%) of the standard mass. Preoperative skeletal muscle mass was significantly correlated with the branched-chain amino acids to tyrosine ratio (r = -0.254, p = 0.005) and body cell mass (r = 0.636, p < 0.001). The overall survival rate in patients with low skeletal muscle mass was significantly lower than in patients with normal/high skeletal muscle mass (p < 0.001). Perioperative nutritional therapy significantly increased overall survival in patients with low skeletal muscle mass (p = 0.009). Multivariate analysis showed that low skeletal muscle mass was an independent risk factor for death after transplantation. In conclusion, sarcopenia was closely involved with posttransplant mortality in patients undergoing LDLT. Perioperative nutritional therapy significantly improved overall survival in patients with sarcopenia.
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Yoshihara T, Naito H, Kakigi R, Ichinoseki-Sekine N, Ogura Y, Sugiura T, Katamoto S. Heat stress activates the Akt/mTOR signalling pathway in rat skeletal muscle. Acta Physiol (Oxf) 2013; 207:416-26. [PMID: 23167446 DOI: 10.1111/apha.12040] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2012] [Revised: 10/30/2012] [Accepted: 11/12/2012] [Indexed: 12/31/2022]
Abstract
AIM It is well known that various stimuli, such as mechanical stress and nutrients, induce muscle hypertrophy thorough the Akt/mTOR signalling pathway, which is a key mediator of protein synthesis and hypertrophy in skeletal muscle. It was recently reported that heat stress also induces an increase in muscle weight and muscle protein content. In addition, heat stress enhances Akt/mTOR signalling after one bout of resistance exercise. However, it remains unclear whether increased temperature itself stimulates the Akt/mTOR signalling pathway. METHODS Forty-two male Wistar rats (279.5 ± 1.2 g) were divided into a control group (CON) or one of five thermal stress groups at 37, 38, 39, 40 or 41 °C (n = 7 each group). After overnight fasting, both legs were immersed in different temperatures of hot water for 30 min under sodium pentobarbital anaesthesia. The soleus and plantaris muscles were immediately removed from both legs after the thermal stress. RESULTS The phosphorylation of mTOR or 4E-BP1 and heat shock protein (HSP) expression levels were similar among groups in both the soleus and plantaris muscles. However, Akt and p70S6K phosphorylation significantly increased at 41 °C in the soleus and plantaris muscles. Moreover, we observed a temperature-dependent increase in Akt and p70S6K phosphorylation in both muscles. CONCLUSION Our data indicate that the altered temperature increased phosphorylation in a temperature-dependent manner in rat skeletal muscle and may itself be a key stimulator of Akt/mTOR signalling.
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Shehata MR, Yagi S, Okamura Y, Iida T, Hori T, Yoshizawa A, Hata K, Fujimoto Y, Ogawa K, Okamoto S, Ogura Y, Mori A, Teramukai S, Kaido T, Uemoto S. Pediatric liver transplantation using reduced and hyper-reduced left lateral segment grafts: a 10-year single-center experience. Am J Transplant 2012; 12:3406-13. [PMID: 22994696 DOI: 10.1111/j.1600-6143.2012.04268.x] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Few studies have examined the long-term outcomes and prognostic factors associated with pediatric living living-donor liver transplantation (LDLT) using reduced and hyper-reduced left lateral segment grafts. We conducted a retrospective, single-center assessment of the outcomes of this procedure, as well as clinical factors that influenced graft and patient survival. Between September 2000 and December 2009, 49 patients (median age: 7 months, weight: 5.45 kg) underwent LDLT using reduced (partial left lateral segment; n = 5, monosegment; n = 26), or hyper-reduced (reduced monosegment grafts; n = 18) left lateral segment grafts. In all cases, the estimated graft-to-recipient body weight ratio of the left lateral segment was more than 4%, as assessed by preoperative computed tomography volumetry, and therefore further reduction was required. A hepatic artery thrombosis occurred in two patients (4.1%). Portal venous complications occurred in eight patients (16.3%). The overall patient survival rate at 1, 3 and 10 years after LDLT were 83.7%, 81.4% and 78.9%, respectively. Multivariate analysis revealed that recipient age of less than 2 months and warm ischemic time of more than 40 min affected patient survival. Pediatric LDLT using reduced and hyper-reduced left lateral segment grafts appears to be a feasible option with acceptable graft survival and vascular complication rates.
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Kurosaka M, Naito H, Ogura Y, Machida S, Katamoto S. Satellite cell pool enhancement in rat plantaris muscle by endurance training depends on intensity rather than duration. Acta Physiol (Oxf) 2012; 205:159-66. [PMID: 22040028 DOI: 10.1111/j.1748-1716.2011.02381.x] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
AIM Increases in the number of satellite cells are necessary for the maintenance of normal muscle function. Endurance training enhances the satellite cell pool. However, it remains unclear whether exercise intensity or exercise duration is more important to enhance the satellite cell pool. This study examined the effects of different intensity and duration of endurance training on the satellite cell pool in rat skeletal muscle. METHODS Forty-one 17-week-old female Sprague-Dawley rats were assigned to control (n = 8), high intensity and high duration (n = 7), high intensity and low duration (n = 8), low intensity and high duration (n = 9) and low intensity and low duration (n = 9) groups. Training groups exercised 5 days per week on a motor driven treadmill for 10 weeks. After the training period, animals were anaesthetized and the plantaris muscles were removed, weighed and analysed for immunohistochemical and histochemical properties. RESULTS Although no significant differences were found in muscle mass, mean fibre area and myonuclei per muscle fibre between all groups, the percentage of satellite cells was significantly higher in the high-intensity groups than in the other groups (P < 0.05). CONCLUSION Increases in the satellite cell pool of skeletal muscle following endurance training depend on the intensity rather than duration of exercise.
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Ueda Y, Marusawa H, Kaido T, Ogura Y, Oike F, Mori A, Ogawa K, Yoshizawa A, Hatano E, Miyagawa-Hayashino A, Haga H, Egawa H, Takada Y, Uemoto S, Chiba T. Effect of maintenance therapy with low-dose peginterferon for recurrent hepatitis C after living donor liver transplantation. J Viral Hepat 2012; 19:32-8. [PMID: 21129128 DOI: 10.1111/j.1365-2893.2010.01398.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Approximately 30% of patients who have recurrent hepatitis C after liver transplantation achieve sustained virological response (SVR) by taking a combination therapy of pegylated interferon and ribavirin. For the remaining non-SVR patients, an effective management treatment has not yet been established. In this study, efficacy of long-term peginterferon maintenance therapy for non-SVR patients was evaluated. Forty patients who had previously received the combination therapy for hepatitis C after living donor liver transplantation were classified into one of the following three groups: the SVR group (n = 11); the non-SVR-IFN group (n =17), which received low-dose peginterferon maintenance therapy for non-SVR patients; and the non-SVR-Withdrawal group (n = 12), which discontinued the interferon treatment. We then compared histological changes among these three groups after 2 or more years follow-up. Activity grade of liver histology improved or remained stable in patients in the SVR and non-SVR-IFN groups, but deteriorated in half of the patients in the non-SVR-Withdrawal group. Fibrosis improved or remained stable in 10 of 11 SVR patients and in 13 of 17 non-SVR-IFN patients, but deteriorated in all non-SVR-Withdrawal patients. Mean changes in fibrosis stage between pretreatment and final liver biopsy were -0.18, +0.06 and +2.2 in the SVR, non-SVR-IFN and non-SVR-Withdrawal groups, respectively. Fibrosis stage deteriorated to F3 or F4 significantly more rapidly in the non-SVR-Withdrawal group than in the other two groups. In conclusion, continuing long-term maintenance therapy with peginterferon prevented histological progression of hepatitis C in patients who had undergone living donor liver transplantation.
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Ogura Y, Kanazawa H, Yoshizawa A, Nitta T, Ikeda T, Uemoto S. Supradiaphragmatic approach for Budd-Chiari syndrome with transjugular intrahepatic portosystemic shunt stent in combination with inferior vena cava reconstruction during living donor liver transplantation: a case report. Transplant Proc 2011; 43:2093-6. [PMID: 21693334 DOI: 10.1016/j.transproceed.2011.03.046] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2011] [Accepted: 03/15/2011] [Indexed: 02/08/2023]
Abstract
Treatment of Budd-Chiari syndrome consists of medical management, surgical shunt, transjugular intrahepatic portosystemic shunt (TIPS), and liver transplantation. Liver transplantation is indicated only when other treatments have failed. A 36-year-old Japanese man underwent living-donor liver transplantation after radiologic intervention procedures. Because of the position of the TIPS stent and the damaged vascular lesion of Budd-Chiari syndrome, a supradiaphragmatic approach was employed to achieve a safe total hepatectomy. Moreover, after resection of damaged portion of the inferior vena cava (IVC), an artificial vascular graft was utilized to fill the IVC gap. The postoperative course was uneventful; no serious complications were experienced within 2 years after liver transplantation. This supradiaphragmatic IVC approach and IVC reconstruction technique emphasized the option of surgical techniques to decrease the operative risk during liver transplantation for Budd-Chiari syndrome.
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Ogura Y, Naito H, Kakigi R, Ichinoseki-Sekine N, Kurosaka M, Yoshihara T, Akema T. Effects of ageing and endurance exercise training on alpha-actinin isoforms in rat plantaris muscle. Acta Physiol (Oxf) 2011; 202:683-90. [PMID: 21518265 DOI: 10.1111/j.1748-1716.2011.02284.x] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
AIM We recently reported that α-actinin adaptation occurs at the isoform level. This study was undertaken to clarify the effects of: (1) ageing-induced shift of myosin heavy chain (MyHC) composition and (2) endurance exercise training on α-actinin isoforms in rat plantaris muscle. METHODS Adult (18 mo) and old (28 mo) male Fischer 344 rats were assigned to either sedentary control or endurance exercise training groups. Animals in the training groups ran on a treadmill for 8 week with training intensity adjusted to be equal for adult and old groups. After the training was completed, the plantaris muscles were taken for analyses of α-actinin-2, α-actinin-3, and MyHC composition and metabolic enzyme activities. RESULTS The proportion of type IIb MyHC was lower, and that of type I MyHC was higher in old animals than in adult animals. α-actinin-3 was significantly lower in old animals than in adult animals. No significant difference was found in α-actinin-2 and citrate synthase (CS) activity between adult and old animals. Citrate synthase activity was higher in trained animals than in sedentary animals. Endurance training produced a fast-to-slow shift within type II MyHC isoforms in both adult and old animals. α-actinin-2 was significantly higher in trained animals than in sedentary animals. No significant difference was found in α-actinin-3 between trained and sedentary animals. CONCLUSION These results support the α-actinin adaptation at the isoform level and show that the α-actinin-3 expression depends on the amount of type II MyHC, whereas α-actinin-2 expression is associated with improvement of muscular aerobic capacity.
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Mainil JG, Bardiau M, Ooka T, Ogura Y, Murase K, Etoh Y, Ichihara S, Horikawa K, Buvens G, Piérard D, Itoh T, Hayashi T. Typing of O26 enterohaemorrhagic and enteropathogenic Escherichia coli isolated from humans and cattle with IS621 multiplex PCR-based fingerprinting. J Appl Microbiol 2011; 111:773-86. [PMID: 21707882 DOI: 10.1111/j.1365-2672.2011.05089.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
AIMS This study evaluated a typing method of O26:H11 enterohaemorrhagic and enteropathogenic Escherichia coli (EHEC and EPEC) based on the variation in genomic location and copy numbers of IS621. METHODS AND RESULTS Two multiplex PCRs, targeting either the left (5') or right (3') IS/chromosome junction of 12 IS621 insertion sites and one PCR specific of another truncated copy, were developed. Thirty-eight amplification profiles were observed amongst a collection of 69 human and bovine O26:H11 EHEC and EPEC. Seventy-one per cent of the 45 EHEC and EPEC with identical IS621 fingerprints within groups of two, three or four isolates had >85% pulsed field gel electrophoresis (PFGE) profile similarity, including four groups of epidemiologically related EHEC or EPEC, while most of the groups had <85% similarity between each others. Epidemiologically related EHEC from each of three independent outbreaks in Japan and Belgium also exhibited identical IS621 fingerprints and PFGE profiles. CONCLUSIONS The IS621 fingerprinting and the PFGE are complementary typing assays of EHEC and EPEC; though, the former is less discriminatory. SIGNIFICANCE AND IMPACT OF THE STUDY The IS621 printing method represents a rapid (24 h) first-line surveillance and typing assay, to compare and trace back O26:H11 EHEC and EPEC during surveys in farms, multiple human cases and outbreaks.
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Iida T, Kaido T, Yoshizawa A, Yagi S, Hata K, Ogura Y, Mori A, Isoda H, Uemoto S. A rare variation of the biliary tree of relevance to live liver donation. Am J Transplant 2011; 11:869-70. [PMID: 21446984 DOI: 10.1111/j.1600-6143.2011.03457.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Hori T, Ueda M, Oike F, Ogura Y, Ogawa K, Nguyen J, Yonekawa Y, Takada Y, Egawa H, Yoshizawa A, Sibulesky L, Balci D, Chen F, Baine AM, Uemoto S. Graft Loss and Poor Outcomes After Living-Donor Liver Transplantation Owing to Arterioportal Shunts Caused by Liver Needle Biopsies. Transplant Proc 2010; 42:2642-4. [DOI: 10.1016/j.transproceed.2010.04.032] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2009] [Revised: 02/05/2010] [Accepted: 04/16/2010] [Indexed: 12/28/2022]
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Hori T, Ogura Y, Okamoto S, Nakajima A, Kami K, Iwasaki J, Yonekawa Y, Ogawa K, Oike F, Takada Y, Egawa H, Nguyen J, Uemoto S. Herpes simplex virus hepatitis after pediatric liver transplantation. Transpl Infect Dis 2010; 12:353-7. [DOI: 10.1111/j.1399-3062.2009.00486.x] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Hori T, Oike F, Hata K, Nishikiori M, Ogura Y, Ogawa K, Takada Y, Egawa H, Nguyen J, Uemoto S. Hashimoto's encephalopathy after interferon therapy for hepatitis C virus in adult liver transplant recipient accompanied by post-transplant lymphoproliferative disorder related to Epstein-Barr virus infection. Transpl Infect Dis 2010; 12:347-52. [DOI: 10.1111/j.1399-3062.2010.00508.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Hori T, Egawa H, Takada Y, Oike F, Kasahara M, Ogura Y, Sakamoto S, Ogawa K, Yonekawa Y, Nguyen JH, Doi H, Ueno M, Uemoto S. Long-term outcomes after living-donor liver transplantation for Alagille syndrome: a single center 20-year experience in Japan. Am J Transplant 2010; 10:1951-2. [PMID: 20659101 DOI: 10.1111/j.1600-6143.2010.03196.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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Tsuboi J, Tajika M, Nakamura T, Kawai H, Bhatia V, Takayama R, Kitamura J, Yatabe Y, Hatooka S, Shinoda M, Yamao K, Ogura Y. Endoscopic features of short-term progression of esophageal intramural pseudodiverticulosis. Endoscopy 2010; 42 Suppl 2:E92-3. [PMID: 20195983 DOI: 10.1055/s-0029-1243915] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
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Matsukawa S, Ichikawa K, Ogura Y. Sm(II)-Mediated Reduction in Water: Importance of the Additive in the Proportionation of SmCl3 and Sm. SYNTHETIC COMMUN 2010. [DOI: 10.1080/00397910903079615] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Kaido T, Oike F, Ogura Y, Mori A, Uemoto S. Impact of pretransplant nutritional status and supplement on postoperative sepsis in living donor liver transplantation. Int J Infect Dis 2010. [DOI: 10.1016/j.ijid.2010.02.2072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Imai H, Egawa H, Kajiwara M, Nakajima A, Ogura Y, Hatano E, Ueda M, Kawaguchi Y, Kaido T, Takada Y, Uemoto S. Resolution of Preoperative Portal Vein Thrombosis After Administration of Antithrombin III in Living Donor Liver Transplantation: Case Report. Transplant Proc 2009; 41:3931-3. [DOI: 10.1016/j.transproceed.2008.10.104] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2008] [Accepted: 10/06/2008] [Indexed: 01/19/2023]
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Hirano Y, Yasukawa T, Usui Y, Nozaki M, Ogura Y. Indocyanine green angiography-guided laser photocoagulation combined with sub-Tenon's capsule injection of triamcinolone acetonide for idiopathic macular telangiectasia. Br J Ophthalmol 2009; 94:600-5. [DOI: 10.1136/bjo.2009.163790] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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Fujiki M, Takada Y, Ogura Y, Oike F, Kaido T, Teramukai S, Uemoto S. Significance of des-gamma-carboxy prothrombin in selection criteria for living donor liver transplantation for hepatocellular carcinoma. Am J Transplant 2009; 9:2362-71. [PMID: 19656125 DOI: 10.1111/j.1600-6143.2009.02783.x] [Citation(s) in RCA: 126] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
Des-gamma-carboxy prothrombin (DCP) levels reportedly correlate with histological features of hepatocellular carcinoma (HCC). We examined serum DCP as a predictor of HCC recurrence in 144 patients who underwent living donor liver transplantation. Receiver operating characteristics (ROC) analysis revealed superiority of DCP and AFP over preoperative tumor size or number for predicting recurrence. Multivariate analysis revealed tumor size >5 cm, > or =11 nodules, and DCP >400 mAU/mL as significant independent risk factors for recurrence. Incidence of microvascular invasion (62% vs. 27%, p = 0.0003) and poor differentiation (38% vs. 16%, p = 0.0087) were significantly higher for patients with DCP >400 mAU/mL than for patients with DCP < or =400 mAU/mL. In ROC analysis for patients with < or =10 nodules all < or =5 cm to predict recurrence, area under the curve was much higher for DCP than for AFP (0.84 vs. 0.69). Kyoto criteria were thus defined as < or =10 nodules all < or =5 cm, and DCP < or =400 mAU/mL. The 5-year recurrence rate for 28 patients beyond-Milan but within-Kyoto criteria was as excellent as that for 78 patients within-Milan criteria (3% vs. 7%). The preoperative DCP level offers additional information regarding histological features, and thus can greatly improve patient selection criteria when used with tumor bulk information.
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Ogura Y, Naito H, Kakigi R, Akema T, Sugiura T, Katamoto S, Aoki J. Different adaptations of alpha-actinin isoforms to exercise training in rat skeletal muscles. Acta Physiol (Oxf) 2009; 196:341-9. [PMID: 19040707 DOI: 10.1111/j.1748-1716.2008.01945.x] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AIM Alpha (alpha)-actinins are located in the skeletal muscle Z-line and form actin-actin cross-links. Mammalian skeletal muscle has two isoforms: alpha-actinin-2 and alpha-actinin-3. However, the response of alpha-actinin to exercise training is little understood. Therefore, the current study examined the effects of exercise training on the expression level of two alpha-actinin isoforms in skeletal muscles. METHODS Twelve male Wistar rats were assigned randomly to a control (C; n = 6) or exercise training (T; n = 6) group. After T animals were trained on an animal treadmill for 9 weeks, alpha-actinin-2 and alpha-actinin-3 levels in the plantaris, white and red gastrocnemius muscles were analysed. In addition, changes in the myosin heavy chain (MyHC) composition were assessed, and muscle bioenergetic enzyme activities were measured. RESULTS Results show that exercise training increased alpha-actinin-2 expression levels in all muscles (P < 0.05). However, no significant difference was found in alpha-actinin-3 expression levels between C and T animals. Subsequent MyHC analyses of all muscle showed an MyHC shift with direction from IIb to IIa. Furthermore, enzymatic analysis revealed that exercise training improved enzyme activities related to aerobic metabolism. CONCLUSION The results of this study demonstrate that exercise training alters the expression level of alpha-actinin at the isoform level. Moreover, the increase in expression levels of alpha-actinin-2 is apparently related to alteration of skeletal muscle: its aerobic capacity is improved.
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Ogura Y, Yagi S, Iida T, Elmoghazy W, Uemoto S. 86. Intentional Portal Pressure Control Can Improve Survivals in Adult-to-Adult Living Donor Liver Transplant, Even With Utilizing Smaller Liver Grafts Than Before. J Surg Res 2009. [DOI: 10.1016/j.jss.2008.11.110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Kaido T, Oike F, Ogura Y, Egawa H, Uemoto S. QS198. Our Challenge to Hospital Mortality Zero After Living Donor Liver Transplantation: A Single Center Experience of Consecutive 1297 Cases. J Surg Res 2009. [DOI: 10.1016/j.jss.2008.11.498] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ueda M, Oike F, Kasahara M, Ogura Y, Ogawa K, Haga H, Takada Y, Egawa H, Tanaka K, Uemoto S. Portal vein complications in pediatric living donor liver transplantation using left-side grafts. Am J Transplant 2008; 8:2097-105. [PMID: 18727696 DOI: 10.1111/j.1600-6143.2008.02360.x] [Citation(s) in RCA: 96] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The aim of this report is to assess the rate of portal vein complications (PVCs), the success rate of treatment for PVCs and the prognosis of patients with PVCs for pediatric living donor liver transplantation (LDLT). Pre- and postoperative records of 521 pediatric LDLTs, using left-side grafts were retrospectively reviewed. The overall rate of PVC was 9%, with early PVC occurring in nine patients (1.7%) with a mortality rate of 67% and late PVC in 38 patients (7.3%). Fifteen of these patients with late PVC showed complete portal vein occlusion despite various treatments, and in six of them the graft was lost. Histological examination revealed fibrosis in portal areas in 13 patients, around the central veins associated with cholestasis in the parenchyma in 10, and hepatocyte ballooning in 12. Correction of portal vein flow or retransplantation is necessary for the rescue of patients with early PVCs. Graft loss in the long term may be high with the occurrence of liver failure or portal hypertension related causes, such as hepatopulmonary syndrome and gastrointestinal bleeding in patients with late PVCs. For the rescue of these patients, especially for patients with body weight < 6 kg, regular monitoring of portal vein flow is essential.
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Ogura Y, Matsunaga Y, Nishiyama T, Amano S. Plasmin induces degradation and dysfunction of laminin 332 (laminin 5) and impaired assembly of basement membrane at the dermal-epidermal junction. Br J Dermatol 2008; 159:49-60. [PMID: 18460030 DOI: 10.1111/j.1365-2133.2008.08576.x] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND The epidermal basement membrane (BM), located at the dermal-epidermal junction (DEJ), plays important roles not only in adhesion between epidermis and dermis, but also in controlling skin functions. In sun-exposed skin, the BM becomes disrupted and multilayered. In order to explore the impairment of BM assembly, we have used a skin-equivalent (SE) as a model of BM damage and previously clarified the involvement of matrix metalloproteinases (MMPs) in impairment of BM assembly. OBJECTIVES In this work, we examined the role of urokinase-type plasminogen activator (uPA) and plasmin in impairment of BM assembly at the DEJ by using the SE, as ultraviolet irradiation to the skin increases uPA as well as MMPs. METHODS SEs were used as a model of formation and damage of BM. Human uPA was detected by enzyme-linked immunosorbent assay and zymography, and gelatinases such as MMP-2 and MMP-9 were detected by zymography. Human plasminogen was added at 0.06 micromol L(-1) (about 3% of plasma level) to increase plasmin to a pathological level. N-terminal peptide sequence analysis of plasmin-treated laminin 332 was carried out to identify alpha3, beta3 and gamma2 chains of laminin 332 and their cleavage sites of each chain. Plasmin-treated laminin 332 was analysed in keratinocyte adhesion activity and binding to type VII collagen. RESULTS Human uPA was detected in addition to MMP-2 and MMP-9, in conditioned medium of SE. Although the BM was well organized in the presence of an MMP inhibitor alone, the activated plasmin disorganized the BM even in the presence of the inhibitor. The impairment of BM assembly made the epidermis thinner as compared with that of a control cultured in the presence of MMP inhibitor, indicating that the BM affects the polarity and differentiation of the epidermis. The addition of aprotinin, a serine proteinase inhibitor, and tranexamic acid, a uPA-plasmin inhibitor, inhibited the plasmin-induced impairment of BM assembly and facilitated BM reorganization, thereby improving the epidermal structure. N-terminal peptide sequence analysis of plasmin-treated laminin 332 revealed the removal of a 5- or 10-kDa fragment, including the cell adhesion region, from the G3 domain of the alpha3 chain, and the LN domain, which binds to the noncollagenous 1 domain in type VII collagen, from the beta3 chain. Plasmin-treated laminin 332 showed lower keratinocyte adhesion activity and reduced binding to type VII collagen. CONCLUSIONS These results suggest that uPA and plasmin are involved in the impairment of BM assembly and epidermal differentiation, and that these effects arise at least partly through direct degradation of laminin 332.
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Kawanaka J, Miyanaga N, Azechi H, Kanabe T, Jitsuno T, Kondo K, Fujimoto Y, Morio N, Matsuo S, Kawakami Y, Mizoguchi R, Tauchi K, Yano M, Kudo S, Ogura Y. 3.1-kJ chirped-pulse power amplification in the LFEX laser. ACTA ACUST UNITED AC 2008. [DOI: 10.1088/1742-6596/112/3/032006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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