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Kimata, Junko,Shigeri, Yasushi,Yoshida, Yasukazu,Niki, Etsuo,Kinumi, Tomoya Korean Society for Mass Spectrometry 2012 Mass spectrometry letters Vol.3 No.1
Artificially oxidized cysteine residues in peroxiredoxin 6 (Prx6) were detected by electrospray interface capillary liquid chromatography-linear ion trap mass spectrometry after the preparation of two-dimensional gel electrophoresis (2D-GE). We used Prx6 as a model protein because it possesses only two cysteine residues at the 47th and 91st positions. The spot of Prx6 on 2D-GE undergoes a basic (isoelectric point, pI 6.6) to acidic (pI 6.2) shift by exposure to peroxide due to selective overoxidation of the active-site cysteine Cys-47 but not of Cys-91. However, we detected a tryptic peptide containing cysteine sulfonic acid at the 47th position from the basic spot and a peptide containing both oxidized Cys-47 and oxidized Cys-91 from the acidic spot of Prx6 after the separation by 2D-GE. We prepared two types of oxidized Prx6s: carrying oxidized Cys-47 (single oxidized Prx6), and other carrying both oxidized Cys-47 and Cys-91 (double oxidized Prx6). Using these oxidized Prx6s, the single oxidized Prx6 and double oxidized Prx6 migrated to pIs at 6.2 and 5.9, respectively. These results suggest that oxidized Cys-47 from the basic spot and oxidized Cys-91 from the acidic spot are generated by artificial oxidation during sample handling processes after isoelectric focusing of 2D-GE. Therefore, it is important to make sure of the origin of cysteine oxidation, if it is physiological or artificial, when an oxidized cysteine residue(s) is identified.
Junko Kimata,Yasushi Shigeri,Yasukazu Yoshida,Etsuo Niki,Tomoya Kinumi 사단법인 한국질량분석학회 2012 Mass spectrometry letters Vol.3 No.1
Artificially oxidized cysteine residues in peroxiredoxin 6 (Prx6) were detected by electrospray interface capillary liquidchromatography-linear ion trap mass spectrometry after the preparation of two-dimensional gel electrophoresis (2D-GE). Weused Prx6 as a model protein because it possesses only two cysteine residues at the 47th and 91st positions. The spot of Prx6 on2D-GE undergoes a basic (isoelectric point, pI 6.6) to acidic (pI 6.2) shift by exposure to peroxide due to selective overoxidationof the active-site cysteine Cys-47 but not of Cys-91. However, we detected a tryptic peptide containing cysteine sulfonic acid atthe 47th position from the basic spot and a peptide containing both oxidized Cys-47 and oxidized Cys-91 from the acidic spot ofPrx6 after the separation by 2D-GE. We prepared two types of oxidized Prx6s: carrying oxidized Cys-47 (single oxidized Prx6),and other carrying both oxidized Cys-47 and Cys-91 (double oxidized Prx6). Using these oxidized Prx6s, the single oxidizedPrx6 and double oxidized Prx6 migrated to pIs at 6.2 and 5.9, respectively. These results suggest that oxidized Cys-47 from thebasic spot and oxidized Cys-91 from the acidic spot are generated by artificial oxidation during sample handling processes afterisoelectric focusing of 2D-GE. Therefore, it is important to make sure of the origin of cysteine oxidation, if it is physiological orartificial, when an oxidized cysteine residue(s) is identified.
Haraguchi, Hiroki,Itoh, Akihide,Kimata, Chisen 한국분석과학회 1995 분석과학 Vol.8 No.4
A study on elemental speciation of trace metals in lake water (Lake Biwa in Japan) has been carried out by a size exclusion chromatography (SEC) / inductively coupled plasma mass spectrometry (ICP-MS) system. Before analysis, the water sample was preconcentrated with a ultrafiltration technique, where the large molecules with molecular weight larger than 10,000 were concentrated. Then the preconcentrated water samples (500-1000 fold) were analyzed by a SEC/ICP-MS system. Most trace metals were found at the UV absorption peaks corresponding to the molecular weights of ca. 300,000 and 10,000-50,000, where trace metals were on-line detected by ICP-MS. The results suggest that many of trace metals exist as the large organic molecules-metal complexes in natural water.
Luke Taylor,Chieko Kimata,Andrea M. Siu,Samantha N. Andrews,Prashant Purohit,Melissa Yamauchi,Andras Bratincsak,Russell Woo,Cass K. Nakasone,Sian Yik Lim 대한골다공증학회 2021 Osteoporosis and Sarcopenia Vol.7 No.3
Objectives: To investigate trends of osteoporosis treatment rates, and factors affecting osteoporosis treatment after hip fracture admission within a single health care system in Hawaii. Methods: A retrospective chart review was conducted of patients aged 50 years or older and hospitalized for hip fractures between January 1, 2011 and December 31, 2019 at Hawaii Pacific Health, a large health care system in Hawaii. We collected data on basic demographics and osteoporosis medication prescription from electronic medical records. We evaluated trends of osteoporosis treatment rates and performed logistic regression to determine factors associated with osteoporosis treatment. Results: The mean for treatment rates for osteoporosis from 2011 to 2019 was 17.2% (range 8.8%-26.0%). From 2011 to 2019 there was a small increase in treatment rates from 16.3% in 2011 to 24.1% in 2019. Men were less likely to receive osteoporosis treatment after admission for hip fracture. Patients discharged to a facility were more likely to receive osteoporosis treatment. As compared to women, men who had a hip fracture were less likely to receive dual-energy X-ray absorptiometry scan, and osteoporosis medication before hip fracture admission. Conclusions: The use of osteoporosis medication for secondary prevention after admission for hip fracture in Hawaii from 2011 to 2019 was low. However, there was a small increase in treatment rates from 2011 to 2019. Disparities in treatment of osteoporosis after hip fracture were noted in men. Significant work is needed to increase treatment rates further, and to address the disparity in osteoporosis treatment between men and women.
Single-Stage Endoscopic Stone Extraction and Cholecystectomy during the Same Hospitalization
Toshiaki Terauchi,Hiroharu Shinozaki,Satoshi Shinozaki,Yuichi Sasakura,Masaru Kimata,Junji Furukawa,Alan Kawarai Lefor,Yoshiro Ogata,Kenji Kobayashi 대한소화기내시경학회 2019 Clinical Endoscopy Vol.52 No.1
Background/Aims: The clinical impact of single-stage endoscopic stone extraction by endoscopic retrograde cholangiopancreatography(ERCP) and cholecystectomy during the same hospitalization remains elusive. This study aimed to determine the effcacy and safety ofsingle-stage ERCP and cholecystectomy during the same hospitalization in patients with cholangitis. Methods: We retrospectively reviewed the medical records of 166 patients who underwent ERCP for mild to moderate cholangitis dueto choledocholithiasis secondary to cholecystolithiasis from 2012 to 2016. Results: Complete stone extraction was accomplished in 92% of patients (152/166) at the first ERCP. Among 152 patients whounderwent complete stone extraction, cholecystectomy was scheduled for 119 patients (78%). Cholecystectomy was performed duringthe same hospitalization in 89% of patients (106/119). We compared two groups of patients: those who underwent cholecystectomyduring the same hospitalization (n=106) and those who underwent cholecystectomy during a subsequent hospitalization (n=13). In thedelayed group, cholecystectomy was performed about three months after the first ERCP. There were no significant differences betweenthe groups in terms of operative time, rate of postoperative complications, and interval from cholecystectomy to discharge. Conclusions: Single-stage endoscopic stone extraction is recommended in patients with mild to moderate acute cholangitis due tocholedocholithiasis. The combination of endoscopic stone extraction and cholecystectomy during the same hospitalization is safe andfeasible.
Carren M. Bosire,Tsegaye Deyou,Jacques M. Kabaru,DennisM. Kimata,Abiy Yenesew 한국응용곤충학회 2014 Journal of Asia-Pacific Entomology Vol.17 No.3
The dichloromethane/methanol (1:1) extract of the stem bark of Millettia usaramensis subspecies usaramensiswas tested for its larvicidal activity against the 4th instar Aedes aegypti larvae and demonstrated activity withLC50 value of 50.8±0.06 μg/mL at 48 h. Compounds isolated from the extractwere also tested for their larvicidalactivities, and the rotenoid usararotenoid-A (LC50 4.3 ± 0.8 μg/mL at 48 h) was identified as the most activeprinciple. This compound appears to be the first rotenoid having a trans-B/C ring junction and methylenedioxygroup at C-2/C-3 with high larvicidal activity. Related rotenoids with the same configuration at the B/C-ringjunction did not show significant activity at 100 μg/mL.
Seiji Komatsu,Kiyoshi Yamada,Shuji Yamashita,Narushi Sugiyama,Eijiro Tokuyama,Kumiko Matsumoto1,Ayumi Takara,Yoshihiro Kimata 대한성형외과학회 2013 Archives of Plastic Surgery Vol.40 No.3
Background We established the Microvascular Research Center Training Program (MRCP)to help trainee surgeons acquire and develop microsurgical skills. Medical students were recruited to undergo the MRCP to assess the effectiveness of the MRCP for trainee surgeons. Methods Twenty-two medical students with no prior microsurgical experience, who completed the course from 2005 to 2012, were included. The MRCP comprises 5 stages of training,each with specific passing requirements. Stages 1 and 2 involve anastomosing silicone tubes and blood vessels of chicken carcasses, respectively, within 20 minutes. Stage 3 involves anastomosing the femoral artery and vein of live rats with a 1-day patency rate of >80%. Stage 4 requires replantation of free superficial inferior epigastric artery flaps in rats with a 7-day success rate of >80%. Stage 5 involves successful completion of one case of rat replantation/transplantation. We calculated the passing rate for each stage and recorded the number of anastomoses required to pass stages 3 and 4. Results The passing rates were 100% (22/22) for stages 1 and 2, 86.4% (19/22) for stage 3, 59.1% (13/22) for stage 4, and 55.0% (11/20) for stage 5. The number of anastomoses performed was 17.2±12.2 in stage 3 and 11.3±8.1 in stage 4. Conclusions Majority of the medical students who undertook the MRCP acquired basic microsurgical skills. Thus, we conclude that the MRCP is an effective microsurgery training program for trainee surgeons.
Komatsu, Seiji,Yamada, Kiyoshi,Yamashita, Shuji,Sugiyama, Narushi,Tokuyama, Eijiro,Matsumoto, Kumiko,Takara, Ayumi,Kimata, Yoshihiro Korean Society of Plastic and Reconstructive Surge 2013 Archives of Plastic Surgery Vol.40 No.3
Background We established the Microvascular Research Center Training Program (MRCP) to help trainee surgeons acquire and develop microsurgical skills. Medical students were recruited to undergo the MRCP to assess the effectiveness of the MRCP for trainee surgeons. Methods Twenty-two medical students with no prior microsurgical experience, who completed the course from 2005 to 2012, were included. The MRCP comprises 5 stages of training, each with specific passing requirements. Stages 1 and 2 involve anastomosing silicone tubes and blood vessels of chicken carcasses, respectively, within 20 minutes. Stage 3 involves anastomosing the femoral artery and vein of live rats with a 1-day patency rate of >80%. Stage 4 requires replantation of free superficial inferior epigastric artery flaps in rats with a 7-day success rate of >80%. Stage 5 involves successful completion of one case of rat replantation/transplantation. We calculated the passing rate for each stage and recorded the number of anastomoses required to pass stages 3 and 4. Results The passing rates were 100% (22/22) for stages 1 and 2, 86.4% (19/22) for stage 3, 59.1% (13/22) for stage 4, and 55.0% (11/20) for stage 5. The number of anastomoses performed was $17.2{\pm}12.2$ in stage 3 and $11.3{\pm}8.1$ in stage 4. Conclusions Majority of the medical students who undertook the MRCP acquired basic microsurgical skills. Thus, we conclude that the MRCP is an effective microsurgery training program for trainee surgeons.