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Development of an Educational Flow Simulation System

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Development of an Educational Flow Simulation System

Homology modeling and structural analysis of human <i>γ</i>-glutamylcysteine ligase catalytic subunit for antitumor drug development

The 10th EPMESC

作者： Tameo Nakanishi hironori Shibata Mutsumi Sato Department of Mechanical Systems Engineering Yamagata University Yonezawa 9928510 Japan Department of Mechanical Systems Engineering Yamagata University Yonezawa 9928510 Japan Department of Mechanical Systems Engineering Yamagata University Yonezawa 9928510 Japan

we developed an interactive two-dimensional flow simulation system. The system solves incompressible laminar and turbulent flows around multiple bodies of complex geometry. The system is based on an o

关键词： computational fluid dynamics educational software incompressible flow overset grid method

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Journal of Biophysical Chemistry 2012年第3期3卷 238-248页

作者： Hideaki Yamaguchi Tatsuo Akitaya Yumi Kidachi Katsuyoshi Kamiie hironori Umetsu Department of Pharmacy Faculty of Pharmaceutical Sciences Aomori University Aomori Japan Department of Pharmacy Faculty of Pharmacy Meijo University Nagoya Japan Laboratory of Food Chemistry Department of Life Sciences Junior College Gifu Shotoku Gakuen University Gifu Japan

Homology modeling and structural analysis of human glutamate cysteine ligase catalytic subunit (hGCLC) were performed with a software package the Molecular Operating Environment. A yeast GCLC (yGCLC;PDB code: 3LVV) was selected as a template for the 3D structure modeling of hGCLC. The modeled hGCLC showed significant 3D similarities at the ligand biding site (LBS) to the yGCLC structure. The contact energy profiles of the hGCLC model were in good agreement with those of the yGCLC structure. Ramachandran plots revealed that only 1.4% of the amino acid residues were in the disfavored region for hGCLC. The molecular electrostatic potential (MEP) map of the hGCLC model exhibited that the model was slightly different from the yGCLC model electrostatically at the LBS. Further, docking simulations revealed the similarity of the ligand-receptor bound location between the hGCLC and yGCLC models. The different binding orientations between the glutathione (GSH)-hGCLC and GSH-yGCLC complexes reflected the different MEP maps at the LBSs between the hGCLC and yGCLC models. These results indicate that the hGCLC model was successfully modeled and analyzed. To the best of our knowledge, this is the first report of a hGCLC model with detailed analyses, and our data verify that the model can be utilized for application to target hGCLC for the development of anticancer drugs.

关键词： Antitumor Drug GCLC MOE

STAT3 deficiency prevents hepatocarcinogenesis and promotes biliary proliferation in thioacetamide-induced liver injury

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World Journal of Gastroenterology 2017年第37期23卷 6833-6844页

作者： Mitsuhiko Abe Takafumi Yoshida Jun Akiba Yu Ikezono Fumitaka Wada Atsutaka Masuda Takahiko Sakaue Toshimitsu Tanaka Hideki Iwamoto Toru Nakamura Michio Sata hironori Koga Akihiko Yoshimura Takuji Torimura Division of Gastroenterology Department of Medicine Kurume University School of Medi-cine Liver Cancer Division Research Center for Innovative Cancer Therapy Kurume University Kurume Clinical pharmacology Clinic Department of Diagnostic pathology Kurume University hospital Department of Microbiology Immun--ology Keio University School of Medicine

AIM To elucidate the role of STAT3 in hepatocarcinogenesis and biliary ductular proliferation following chronic liver injury. METHODS We investigated thioacetamide(TAA)-induced liver injury, compensatory hepatocyte proliferation, and hepatocellular carcinoma(HCC) development in hepatic STAT3-deficient mice. In addition, we evaluated TAAinduced biliary ductular proliferation and analyzed the activation of sex determining region Y-box9(SOX9) and Yes-associated protein(YAP), which regulate the transdifferentiation of hepatocytes to *** Both compensatory hepatocyte proliferation and HCC formation were significantly decreased in hepatic STAT3-deficient mice as compared with control mice. STAT3 deficiency resulted in augmentation of hepatic necrosis and fibrosis. On the other hand, biliary ductular proliferation increased in hepatic STAT3-deficient livers as compared with control livers. SOX9 and YAP were upregulated in hepatic STAT3-deficient *** STAT3 may regulate hepatocyte proliferation as well as transdifferentiation into cholangiocytes and serve as a therapeutic target for HCC inhibition and biliary regeneration.

关键词： Hepatocellular carcinoma Ductular reaction Signal transducer and activator of transcription 3 Yesassociated protein Sex determining region Y-box9 Transdifferentiation

A GLOBAL VIEW OF THE LANDFALL CHARACTERISTICS OF TROPICAL CYCLONES

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Tropical Cyclone Research and Review 2014年第3期3卷 178-192页

作者： hironori FUDEYASU SHUN HIROSE HIROAKI YOSHIOKA RIE KUMAZAWA SHOTA YAMASAKI Yokohama National University

This report presents a climatology of the landfall characteristics of tropical cyclones(TCs) by country. Landfalling TCs can produce strong winds, storm surges and severe flooding that may result in loss of life and widespread damages. Although historically many governments have estimated the frequency of TC landfall for their own country, less work has been undertaken from a global viewpoint. This report addresses that gap by presenting a comparative assessment that may assist global efforts toward disaster risk reduction through improved understanding of the relative level of exposure of countries to TCs. The various aspects of the climatology of TC landfalls for each country are provided. Using the definition of a TC landfall as the intersection of the TC track with a coastline, eleven countries were detected as having an average of at least one landfall per year. China has the highest rate of TC landfalls. The Philippines ranks second and Japan third. A lot of countries that face the North Western Pacific were included in TC-Landfall countries, which is attributed to the high rate of TC formation over the basin.

关键词： landfall climatology of landfall characteristics ranking of TC landfall country

Comparison of the Motion Accuracy of a Six Degrees of Freedom Radiotherapy Couch with and without Weights

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International Journal of Medical Physics, Clinical Engineering and Radiation Oncology 2013年第3期2卷 69-75页

作者： Akihiro Takemura Shinichi Ueda Kimiya Noto hironori Kojima Naoki Isomura Department of Radiology Kanazawa University Hospital Kanazawa Japan Faculty of Health Sciences Institute of Medical Pharmaceutical and Health Sciences Kanazawa University Kanazawa Japan

In this study, we compared the motion accuracy of six degrees of freedom (6D) couch for precision radiotherapy with or without weights attached to the couch. Two digital cameras were focused on the iso-center of a linear accelerator. Images of a needle which had been fixed to the 6D couch were obtained using the cameras when the couch moved in translation and rotation around each axis. The three-dimensional (3D) coordinates of the needle were calculated from coordinate values in the images. A coordinate error of the needle position relative to the theoretical position was calculated. The errors were obtained with or without a 60 kg weight attached to the 6D couch, and these errors were compared with each other. The mean distance of the 3D error vectors for the weighted test was 0.21 ± 0.11 mm, and >0.16 ± 0.09 mm for the non-weighted test (p

关键词： 6D Couch IGRT Accuracy Assessment

Hot snare polypectomy vs endoscopic mucosal resection using bipolar snare for intermediate size colorectal lesions:Propensity score matching

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World Journal of Gastroenterology 2023年第23期29卷 3668-3677页

作者： Nobuhisa Minakata Tatsuro Murano Masashi Wakabayashi Maasa Sasabe Takashi Watanabe Tomohiro Mitsui Hiroki Yamashita Atsushi Inaba hironori Sunakawa Keiichiro Nakajo Tomohiro Kadota Kensuke Shinmura Hiroaki Ikematsu Tomonori Yano Department of Gastroenterology and Endoscopy National Cancer Center Hospital EastKashiwa 2778577ChibaJapan Department of Biostatistics Division Center for Research Administration and SupportNational Cancer CenterKashiwa 2778577ChibaJapan

BACKGROUND Endoscopic resection(ER)with bipolar snare,in which the electric current only passes through the tissue between the device’s two electrodes,is a prominent method used to prevent perforation due to electricity *** using bipolar snare with or without submucosal injection enabled safe resection of colorectal lesions measuring 10-15 mm in an ex vivo porcine *** with bipolar snare is expected to have good treatment outcomes in 10-15 mm colorectal lesions,with high safety even without submucosal ***,no clinical reports have compared treatment outcomes with and without submucosal *** To compare the treatment outcomes of bipolar polypectomy with hot snare polypectomy(HSP)to those with endoscopic mucosal resection(EMR).METHODS In this single-centre retrospective study,we enrolled 10-15 mm nonpedunculated colorectal lesions(565 Lesions in 463 patients)diagnosed as type 2A based on the Japan Narrow-band Imaging Expert Team classification,resected by either HSP or EMR between January 2018 and June 2021 at the National Cancer Center Hospital *** were divided into HSP and EMR groups,and propensity score matching was *** the matched cohort,en bloc and R0 resection rates and adverse events were compared between the two *** Of the 565 lesions in 463 patients,117 lesions each in the HSP and EMR groups were selected after propensity score *** the original cohort,there was a significant difference in antithrombotic drug use(P<0.05),lesion size(P<0.01),location(P<0.01),and macroscopic type(P<0.05)between the HSP and EMR *** the matched cohort,the en bloc resection rates were comparable between both groups[93.2%(109/117)vs 92.3%(108/117),P=0.81],and there was no significant difference in the R0 resection rate[77.8%(91/117)vs 80.3%(94/117),P=0.64].The incidence of delayed bleeding was similar in both groups[1.7%(2/117)].Perforation occurred in the EMR group[0.9%(1/117)]but not in the HSP ***

关键词： Adenoma Cohort studies Colonoscopy Colorectal cancer Endoscopic mucosal resection Treatment outcome

Non-steroidal anti-inflammatory drug-induced small bowel injuries identified by double-balloon endoscopy

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World Journal of Gastroenterology 2005年第31期11卷 4861-4864页

作者： Yoshikazu Hayashi hironori Yamamoto Hiroto Kita Keijiro Sunada Hiroyuki Sato Tomonori Yano Michiko Iwamoto Yutaka Sekine Tomohiko Miyata Akiko Kuno Takaaki Iwaki Yoshiyuki Kawamura Hironari Ajibe Kenichi Ido Kentaro Sugano Department of Internal Medicine

AIM： To clarify clinical features of the NSAID-induced sma bowel lesions using a new method of endoscopy. METHODS： This is a retrospective study and we analyzed seven patients with small bowel lesions while taking NSAIDs among 61 patients who had undergone doubleballoon endoscopy because of gastro-intestinal bleeding or anemia between September 2000 and March 2004, at .lichi Medical School Hospital in Japan. Neither conventional EGD nor colonoscopy revealed any lesions of potential bleeding sources including ulcerations. Double-balloon endoscopy was carried out from oral approach in three patients, from anal approach in three patients, and from both approaches in one patient. RESULTS： Ulcers or erosions were observed in the ileum in six patients and in the jejunum in one patient, respectively. The ulcers were multiple in all the patients with different features from tiny punched out ulcers to deep ulcerations with oozing hemorrhage or scar. All the patients recovered uneventfully and had full resolution of symptoms after suspension of the drug. CONCLUSION： NSAIDs can induce injuries in the small bowel even in patients without any lesions in both the stomach and colon.

关键词： Double-balloon endoscopy NSAIDS-inducedsmall bowel injuries

Long-term lamivudine treatment for chronic,hepatitis B in Japanese patients:A project of Kyushu University Liver Disease Study

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World Journal of Gastroenterology 2006年第4期12卷 561-567页

作者： Norihiro Furusyo Hiroaki Takeoka Kazuhiro Toyoda Masayuki Murata Yuichi Tanabe Eiji Kajiwara Junya Shimono Akihide Masumoto Toshihiro Maruyama Hideyuki Nomura Makoto Nakamuta Kazuhiro Takahashi Shinji Shimoda Koichi Azuma hironori Sakai Jun Hayashi Department of General Medicine Kyushu University Hospital Department of Environmental Medicine and Infectious Diseases Graduate School of Medical Sciences. Kyushu University Fukuoka Japan Department of Medicine Fukuoka City HospitalFukuoka Japan Department of Internal Medicine Nippon SteelYawata Memorial Hospital Kitakyushu Japan Department of Medicine Yahata SaiseikaiHospital Kitakyushu Japan Department of Clinical Research NationalHospital Organization Kokura Hospital Kitakyushu Japan Department of Medicine KitakyushuMunicipal Medical Center Kitakyushu Japan Department of Internal Medicine ShinKokura Hospital Kitakyushu Japan Department of Medicine and Bioregulatory Science Graduate School of Medical Sciences Kyushu University Fukuoka Japan Department of Medicine HamanomachiHospital Fukuoka Japan Department of Medicine and Biosystemic Science Graduate School of Medical Sciences Kyushu University Fukuoka Japan Department of Medicine and Clinical Science Graduate School of Medical Sciences Kyushu University Fukuoka Japan Department of Gastroenterology National Hospital Organization Kyushu Medical Center Fukuoka Japan

AIM： To determine the efficacy of long-term lamivudine treatment of a large number of Japanese patients with chronic hepatitis B. METHODS： In this retrospective, multi-center trial, 318 Japanese patients with chronic hepatitis B received 100 mg of lamivudine daily for up to 36 （median 21） mo. Virological response was a decline to a serum HBV DNA level less than 3.7 log copies/mL. Virological breakthrough was defined as the reappearance of a serum HBV DNA level to more than 10-fold the minimum during treatment. RESULTS： Lamivudine produced virological response in 86.8% of the 318 patients at 6 mo, in 80.2% of 252 patients at 12 mo, in 69.2% of 133 patients at 24 mo, and in 53.6% of 28 patients at 36 mo. Forward stepwise logistic regression analysis showed an HBV DNA level less than 6.8 log copies/mL （P〈 0.0001）, HBeAg negativity （P〈 0.0001）, a platelet count of 100×10^9/L or more （P= 0.0162） at baseline, and a decline of the HBV DNA level of more than 3.2 log copies/mL as compared with the baseline level at 3 mo after the start of treatment （P= 0.0003） to be significantly associated with virological response. Among patients with a virological response, virological breakthrough was seen in 5.3% of 19 patients who responded virologically at 1 mo, in 20.7% of 203 patients at 3 mo, in 27.5% of 51 patients at 6 mo, in 33.3% of 12 patients at 9 mo, and in 100% of 3 patients at ≥15 mo. A virological breakthrough was found significantly more often in patients with delayed virological response. CONCLUSION： Lamivudine treatment could suppress serum HBV DNA in most of the tested Japanese patients. Long-term efficacy might be seen in patients without HBeAg at baseline, in the absence of cirrhosis, and in patients with a decline in HBV DNA level soon after the start of treatment.

关键词： Hepatitis B virus Lamivudine HBeAg Cirrhosis

MicroRNA-31 expression in colorectal serrated pathway progression

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World Journal of Gastroenterology 2014年第34期20卷 12346-12349页

作者： hironori Aoki Katsuhiko Nosho Hisayoshi Igarashi Miki Ito Kei Mitsuhashi Takafumi Naito Eiichiro Yamamoto Tokuma Tanuma Masafumi Nomura Hiroyuki Maguchi Toshiya Shinohara Hiromu Suzuki Hiroyuki Yamamoto Yasuhisa Shinomura Center for Gastroenterology Teine-Keijinkai HospitalSapporo 006-0811Japan Department of Gastroenterology Rheumatology and Clinical ImmunologySapporo Medical University School of MedicineSapporo 060-8543Japan Department of Gastroenterology Rheumatology andClinical ImmunologySapporo Medical University School of MedicineSapporo 060-8543Japan Department of Pathology Teine-KeijinkaiHospitalSapporo 006-0811Japan Department of Molecular Biology SapporoMedical University School of MedicineSapporo 060-8543Japan Division of Gastroenterology and Hepatology Department of Internal MedicineSt. Marianna University School of MedicineKawasaki 216-8511Japan

MicroRNAs have been increasingly recognized as useful biomarkers for colorectal cancers(CRC).We have recently observed that microRNA-31(miR-31)expression is associated with BRAF mutation and prognosis in ***,high miR-31 expression is frequently detected in sessile serrated adenomas compared with hyperplastic polyps(HPs).These results suggest that miR-31 may contribute to the progression of serrated *** a follow-up colonoscopy,we observed the case of a 75-year-old man with a 7-mm flat-elevated lesion in the cecum and diagnosed the lesion as an early invasive carcinoma with serrated *** specimens were obtained from the representative areas to compare the molecular alterations in the carcinoma component with those in the HP *** miR-31 expression was observed in the carcinoma component(57-fold increase)and the HP component(8-fold increase)compared with the paired normal mucosa,suggesting that miR-31 may be one of the key molecules in serrated pathway progression.

关键词： BRAF Colorectal carcinoma MicroRNA-31 MLH1 microsatellite instability Serrated pathway