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Matsuo K, Takazawa Y, Ross MS, Elishaev E, Podzielinski I, Yunokawa M, Sheridan TB, Bush SH, Klobocista MM, Blake EA, Takano T, Matsuzaki S, Baba T, Satoh S, Shida M, Nishikawa T, Ikeda Y, Adachi S, Yokoyama T, Takekuma M, Fujiwara K, Hazama Y, Kadogami D, Moffitt MN, Takeuchi S, Nishimura M, Iwasaki K, Ushioda N, Johnson MS, Yoshida M, Hakam A, Li SW, Richmond AM, Machida H, Mhawech-Fauceglia P, Ueda Y, Yoshino K, Yamaguchi K, Oishi T, Kajiwara H, Hasegawa K, Yasuda M, Kawana K, Suda K, Miyake TM, Moriya T, Yuba Y, Morgan T, Fukagawa T, Wakatsuki A, Sugiyama T, Pejovic T, Nagano T, Shimoya K, Andoh M, Shiki Y, Enomoto T, Sasaki T, Fujiwara K, Mikami M, Shimada M, Konishi I, Kimura T, Post MD, Shahzad MM, Im DD, Yoshida H, Omatsu K, Ueland FR, Kelley JL, Karabakhtsian RG, Roman LD. Significance of histologic pattern of carcinoma and sarcoma components on survival outcomes of uterine carcinosarcoma. Ann Oncol 2016; 27:1257-66. [PMID: 27052653 DOI: 10.1093/annonc/mdw161] [Citation(s) in RCA: 51] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2015] [Accepted: 03/29/2016] [Indexed: 11/13/2022] Open
Abstract
BACKGROUND To examine the effect of the histology of carcinoma and sarcoma components on survival outcome of uterine carcinosarcoma. PATIENTS AND METHODS A multicenter retrospective study was conducted to examine uterine carcinosarcoma cases that underwent primary surgical staging. Archived slides were examined and histologic patterns were grouped based on carcinoma (low-grade versus high-grade) and sarcoma (homologous versus heterologous) components, correlating to clinico-pathological demographics and outcomes. RESULTS Among 1192 cases identified, 906 cases were evaluated for histologic patterns (carcinoma/sarcoma) with high-grade/homologous (40.8%) being the most common type followed by high-grade/heterologous (30.9%), low-grade/homologous (18.0%), and low-grade/heterologous (10.3%). On multivariate analysis, high-grade/heterologous (5-year rate, 34.0%, P = 0.024) and high-grade/homologous (45.8%, P = 0.017) but not low-grade/heterologous (50.6%, P = 0.089) were independently associated with decreased progression-free survival (PFS) compared with low-grade/homologous (60.3%). In addition, older age, residual disease at surgery, large tumor, sarcoma dominance, deep myometrial invasion, lymphovascular space invasion, and advanced-stage disease were independently associated with decreased PFS (all, P < 0.01). Both postoperative chemotherapy (5-year rates, 48.6% versus 39.0%, P < 0.001) and radiotherapy (50.1% versus 44.1%, P = 0.007) were significantly associated with improved PFS in univariate analysis. However, on multivariate analysis, only postoperative chemotherapy remained an independent predictor for improved PFS [hazard ratio (HR) 0.34, 95% confidence interval (CI) 0.27-0.43, P < 0.001]. On univariate analysis, significant treatment benefits for PFS were seen with ifosfamide for low-grade carcinoma (82.0% versus 49.8%, P = 0.001), platinum for high-grade carcinoma (46.9% versus 32.4%, P = 0.034) and homologous sarcoma (53.1% versus 38.2%, P = 0.017), and anthracycline for heterologous sarcoma (66.2% versus 39.3%, P = 0.005). Conversely, platinum, taxane, and anthracycline for low-grade carcinoma, and anthracycline for homologous sarcoma had no effect on PFS compared with non-chemotherapy group (all, P > 0.05). On multivariate analysis, ifosfamide for low-grade/homologous (HR 0.21, 95% CI 0.07-0.63, P = 0.005), platinum for high-grade/homologous (HR 0.36, 95% CI 0.22-0.60, P < 0.001), and anthracycline for high-grade/heterologous (HR 0.30, 95% CI 0.14-0.62, P = 0.001) remained independent predictors for improved PFS. Analyses of 1096 metastatic sites showed that carcinoma components tended to spread lymphatically, while sarcoma components tended to spread loco-regionally (P < 0.001). CONCLUSION Characterization of histologic pattern provides valuable information in the management of uterine carcinosarcoma.
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Hosaka S, Murayama N, Satsukawa M, Uehara S, Shimizu M, Iwasaki K, Iwano S, Uno Y, Yamazaki H. Similar substrate specificity of cynomolgus monkey cytochrome P450 2C19 to reported human P450 2C counterpart enzymes by evaluation of 89 drug clearances. Biopharm Drug Dispos 2015; 36:636-43. [DOI: 10.1002/bdd.1991] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2015] [Revised: 08/22/2015] [Accepted: 08/30/2015] [Indexed: 01/19/2023]
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Hosaka S, Murayama N, Satsukawa M, Uehara S, Shimizu M, Iwasaki K, Iwano S, Uno Y, Yamazaki H. Comprehensive Evaluation for Substrate Selectivity of Cynomolgus Monkey Cytochrome P450 2C9, a New Efavirenz Oxidase. Drug Metab Dispos 2015; 43:1119-22. [DOI: 10.1124/dmd.115.063925] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2015] [Accepted: 05/06/2015] [Indexed: 11/22/2022] Open
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Utoh M, Yoshikawa T, Hayashi Y, Shimizu M, Iwasaki K, Uno Y, Yamazaki H. Slow R-warfarin 7-hydroxylation mediated by P450 2C19 genetic variants in cynomolgus monkeys in vivo. Biochem Pharmacol 2015; 95:110-4. [DOI: 10.1016/j.bcp.2015.03.008] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2015] [Accepted: 03/12/2015] [Indexed: 12/23/2022]
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Ishizaki H, Umemura K, Mineta H, Nozue M, Matsuoka I, Iwasaki K, Nishida Y. The examination of body sway in normal subjects and patients with Ménière's disease or cerebellar dysfunction. Adv Otorhinolaryngol 2015; 41:166-72. [PMID: 3265001 DOI: 10.1159/000416051] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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Iwasaki K, Kogo N, Dei M. Example Of Analysis Utilizing Real World Data: Medical Cost Reduction By Advising Untreated-Diabetes Patients To Visit Doctors. VALUE IN HEALTH : THE JOURNAL OF THE INTERNATIONAL SOCIETY FOR PHARMACOECONOMICS AND OUTCOMES RESEARCH 2014; 17:A744. [PMID: 27202686 DOI: 10.1016/j.jval.2014.08.158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
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Iwasaki K, Kogo N, Dei M. Example of Analysis Utilizing Real World Data: Medical Cost Reduction of Combination Drugs. VALUE IN HEALTH : THE JOURNAL OF THE INTERNATIONAL SOCIETY FOR PHARMACOECONOMICS AND OUTCOMES RESEARCH 2014; 17:A720-A721. [PMID: 27202550 DOI: 10.1016/j.jval.2014.08.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
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Iwasaki K, Kogo N, Dei M. Example of Analysis Utilizing Real World Data: Medical Cost Reduction by Advising Untreated-Hypertension Patients to Visit Doctors. VALUE IN HEALTH : THE JOURNAL OF THE INTERNATIONAL SOCIETY FOR PHARMACOECONOMICS AND OUTCOMES RESEARCH 2014; 17:A760. [PMID: 27202778 DOI: 10.1016/j.jval.2014.08.252] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
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Hosaka S, Murayama N, Satsukawa M, Shimizu M, Uehara S, Fujino H, Iwasaki K, Iwano S, Uno Y, Yamazaki H. Evaluation of 89 Compounds for Identification of Substrates for Cynomolgus Monkey CYP2C76, a New Bupropion/Nifedipine Oxidase. Drug Metab Dispos 2014; 43:27-33. [DOI: 10.1124/dmd.114.061275] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Uno Y, Utoh M, Iwasaki K. Polymorphisms of neonatal Fc receptor in cynomolgus and rhesus macaques. Drug Metab Pharmacokinet 2014; 29:427-30. [PMID: 24806819 DOI: 10.2133/dmpk.dmpk-14-nt-033] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Neonatal Fc receptor (FcRn), a heterodimer of MHC class I-like protein and β2-microglobulin, encoded by FCGRT and B2M, respectively, is important for recycling immunoglobulin G (IgG) antibodies by binding with the Fc region of IgG. Cynomolgus macaques are important animal species used in the evaluation of therapeutic antibodies, largely due to sequence similarities of target proteins to those of humans. Because the function of FcRn could be modified by mutations in FCGRT or B2M, 71 cynomolgus and 24 rhesus macaques were analyzed in the present study. A total of 21 variants were identified, of which 4 were non-synonymous in FCGRT. Fifteen variants were unique to cynomolgus macaques, of which 3, 2, and 5 were unique to cynomolgus macaques bred in China (MacfaCHN), Cambodia (MacfaCAM), and Indonesia (MacfaIDN), respectively. Five variants were shared by MacfaCHN and MacfaCAM, but not by MacfaIDN. In B2M, only 5 variants were found, including 2 non-synonymous variants. Tissue expression analysis showed that cynomolgus FCGRT and B2M were widely expressed in the 10 tissue types analyzed. None of the non-synonymous variants of FCGRT or B2M found changes in the amino acid residues known to be important for FcRn function, suggesting that substantial inter-animal variability of FcRn is not expected for the cynomolgus macaques analyzed.
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Muroi C, Fujioka M, Mishima K, Irie K, Fujimura Y, Nakano T, Fandino J, Keller E, Iwasaki K, Fujiwara M. Effect of ADAMTS-13 on cerebrovascular microthrombosis and neuronal injury after experimental subarachnoid hemorrhage. J Thromb Haemost 2014; 12:505-14. [PMID: 24476338 DOI: 10.1111/jth.12511] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2013] [Accepted: 12/17/2013] [Indexed: 11/30/2022]
Abstract
BACKGROUND Microthrombosis and reactive inflammation contribute to neuronal injury after subarachnoid hemorrhage (SAH). ADAMTS-13 cleaves von Willebrand factor multimers, and inhibits thrombus formation and, seemingly, inflammatory reactions. OBJECTIVE To investigate the effect of ADAMTS-13 in experimental SAH. METHODS A total of 100 male C57/BL6 mice were randomly assigned to four groups: sham (n = 15), SAH (n = 27), vehicle (n = 25), and ADAMTS-13 (n = 23; 100 μL per 10 g of body weight of 100 μg of ADAMTS-13 per 1 mL of 0.9% NaCl; 20 min after SAH). Neurologic performance was assessed on days 1 and 2 after SAH. Animals were killed on day 2. The amounts of subarachnoid blood, microthrombi, apoptosis and degenerative neurons were compared. The degree of neuronal inflammation and vasospasm was also compared. In five mice each (SAH and ADAMTS-13 groups), bleeding time was assessed 2 h after SAH. RESULTS Systemic administration of ADAMTS-13 achieved significant amelioration of microthrombosis and improvement in neurologic performance. ADAMTS-13 reduced the amount of apoptotic and degenerative neurons. A tendency for decreased neuronal inflammation was observed. ADAMTS-13 did not show any significant effect on vasospasm. The degree of systemic inflammation was not changed by ADAMTS-13 administration. ADAMTS-13 neither increased the amount of subarachnoid blood nor prolonged the bleeding time. CONCLUSIONS ADAMTS-13 may reduce neuronal injury after SAH by reducing microthrombosis formation and neuronal inflammation, thereby providing a new option for mitigating the severity of neuronal injury after SAH.
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Norimura D, Isomoto H, Fukuda E, Yamao T, Ozawa E, Iwasaki K, Ohnita K, Takeshima F, Shikuwa S, Nakao K. Cowden's disease manifested by esophageal polyposis with characteristic appearance on magnifying endoscopy using narrow band imaging. Endoscopy 2014; 45 Suppl 2 UCTN:E298. [PMID: 24008475 DOI: 10.1055/s-0032-1310022] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
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Yajima K, Uno Y, Murayama N, Uehara S, Shimizu M, Nakamura C, Iwasaki K, Utoh M, Yamazaki H. Evaluation of 23 Lots of Commercially Available Cryopreserved Hepatocytes for Induction Assays of Human Cytochromes P450. Drug Metab Dispos 2014; 42:867-71. [DOI: 10.1124/dmd.113.056804] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Utoh M, Murayama N, Uno Y, Onose Y, Hosaka S, Fujino H, Shimizu M, Iwasaki K, Yamazaki H. Monkey liver cytochrome P450 2C9 is involved in caffeine 7-N-demethylation to form theophylline. Xenobiotica 2013; 43:1037-42. [PMID: 23679834 DOI: 10.3109/00498254.2013.793874] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Caffeine (1,3,7-trimethylxanthine) is a phenotyping substrate for human cytochrome P450 1A2. 3-N-Demethylation of caffeine is the main human metabolic pathway, whereas monkeys extensively mediate the 7-N-demethylation of caffeine to form pharmacological active theophylline. Roles of monkey P450 enzymes in theophylline formation from caffeine were investigated using individual monkey liver microsomes and 14 recombinantly expressed monkey P450 enzymes, and the results were compared with those for human P450 enzymes. Caffeine 7-N-demethylation activity in microsomes from 20 monkey livers was not strongly inhibited by α-naphthoflavone, quinidine or ketoconazole, and was roughly correlated with diclofenac 4'-hydroxylation activities. Monkey P450 2C9 had the highest activity for caffeine 7-N-demethylation. Kinetic analysis revealed that monkey P450 2C9 had a high Vmax/Km value for caffeine 7-N-demethylation, comparable to low Km value for monkey liver microsomes. Caffeine could dock favorably with monkey P450 2C9 modeled for 7-N-demethylation and with human P450 1A2 for 3-N-demethylation. The primary metabolite theophylline was oxidized to 8-hydroxytheophylline in similar ways by liver microsomes and by recombinant P450s in both humans and monkeys. These results collectively suggest a high activity for monkey liver P450 2C9 toward caffeine 7-N-demethylation, whereas, in humans, P450 1A2-mediated caffeine 3-N-demethylation is dominant.
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Nakanishi Y, Yamashita H, Yoshikawa T, Tominaga T, Nojiri K, Sunaga Y, Muneoka A, Iwasaki K, Utoh M, Nakamura C, Yamazaki H, Uno Y. Cytochrome P450 metabolic activities in the small intestine of cynomolgus macaques bred in Cambodia, China, and Indonesia. Drug Metab Pharmacokinet 2013; 28:510-3. [PMID: 23648676 DOI: 10.2133/dmpk.dmpk-13-nt-031] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Cynomolgus macaques, used in drug metabolism studies due to their evolutionary closeness to humans, are mainly bred in Asian countries, including Cambodia, China, and Indonesia. Cytochromes P450 (P450s) are important drug-metabolizing enzymes, present in the liver and small intestine, major drug metabolizing organs. Previously, our investigation did not find statistically significant differences in hepatic P450 metabolic activities measured in cynomolgus macaques bred in Cambodia (MacfaCAM) and China (MacfaCHN). In the present study, P450 metabolic activity was investigated in the small intestine of MacfaCAM and MacfaCHN, and cynomolgus macaques bred in Indonesia (MacfaIDN) using P450 substrates, including 7-ethoxyresorufin, coumarin, bupropion, paclitaxel, diclofenac, S-mephenytoin, bufuralol, chlorzoxazone, and testosterone. The results indicated that P450 metabolic activity of the small intestine was not statistically significantly different (<2.0-fold) in MacfaCAM, MacfaCHN, and MacfaIDN. In addition, statistically significant sex differences were not observed (<2.0-fold) in any P450 metabolic activity in MacfaCAM as supported by mRNA expression results. These results suggest that P450 metabolic activity of the small intestine does not significantly differ statistically among MacfaCAM, MacfaCHN, and MacfaIDN.
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Ieiri I, Doi Y, Maeda K, Sasaki T, Kimura M, Hirota T, Chiyoda T, Miyagawa M, Irie S, Iwasaki K, Sugiyama Y. Microdosing Clinical Study: Pharmacokinetic, Pharmacogenomic (SLCO2B1), and Interaction (Grapefruit Juice) Profiles of Celiprolol Following the Oral Microdose and Therapeutic Dose. J Clin Pharmacol 2013; 52:1078-89. [DOI: 10.1177/0091270011408612] [Citation(s) in RCA: 81] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Tokumine J, Lefor AT, Yonei A, Kagaya A, Iwasaki K, Fukuda Y. Three-step method for ultrasound-guided central vein catheterization. Br J Anaesth 2013; 110:368-73. [PMID: 23131458 DOI: 10.1093/bja/aes381] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND The long-axis view and in-plane needle approach (LAX-IP) for ultrasound-guided central vein catheterization is considered ideal because of the quality of real-time imaging. We describe a novel technique, using a step-by-step procedure, to overcome the pitfalls associated with the LAX-IP. This study was undertaken to demonstrate the clinical utility of this approach. METHODS All operators underwent training before participation in this study. One hundred patients were enrolled in this study and underwent central venous catheterization using this method. Using a portable ultrasound and vein catheterization kit, patients were appropriately positioned and a straight portion of the vein identified (Step 1). A needle guide was used (Step 2) and the vein imaged in real time in two directions (Step 3), to identify the true long axis and prevent damage to surrounding tissues. RESULTS The overall success rate for catheterization was 100% with a median of one puncture for each patient. All catheterizations were performed within three punctures. Problems with the first puncture included difficult insertion of the guide-wire due to coiling, difficult anterior wall puncture, less experience with the procedure, and other reasons. There were no complications associated with the procedure. CONCLUSIONS This three-step method is not dependent on an operator's ability to proceed based on spatial awareness, but rather depends on logic. This method can prevent difficulties associated with a two-dimensional ultrasound view, and may be a safer technique compared with others. Further clinical trials are needed to establish the safety of this technique.
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Emoto C, Yoda N, Uno Y, Iwasaki K, Umehara K, Kashiyama E, Yamazaki H. Comparison of p450 enzymes between cynomolgus monkeys and humans: p450 identities, protein contents, kinetic parameters, and potential for inhibitory profiles. Curr Drug Metab 2013; 14:239-252. [PMID: 22963393] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Revised: 06/05/2012] [Accepted: 08/15/2012] [Indexed: 06/01/2023]
Abstract
Cynomolgus monkeys are used to predict human pharmacokinetic and/or toxic profiles in the drug developmental stage. Cynomolgus P450s exhibit a high degree of identity (more than 90%) in both cDNA and amino acid sequences with corresponding human P450s. CYP3A protein predominantly exists in cynomolgus monkey liver microsomes, followed by CYP2A, CYP2C, CYP2B6, CYP2E1, and CYP2D. There are many similarities of metabolic properties in cytochrome P450s between cynomolgus monkeys and humans, but the species differences between cynomolgus monkey and human P450s are clearly present in substrate specificity and inhibitor selectivity. Diclofenac 4'-hydroxylation (DFOH) in monkey liver and intestinal microsomes shows much lower activities compared with those in human liver and intestinal microsomes. Sulfaphenazole strongly inhibits DFOH in human liver microsomes, but does not effectively inhibit DFOH in monkey liver and intestinal microsomes. Cynomolgus CYP2C19 exhibits higher activity for DFOH than cynomolgus CYP2C9 although this reaction is a marker reaction of human CYP2C9. On the other hand, cynomolgus CYP2C76 orthologue is not expressed in humans and shows 70-72% identity in amino acid sequences of human CYP2C subfamilies. Cynomolgus CYP2C76 metabolizes non-CYP2C substrates, 7-ethoxyresorufin (human CYP1A substrate) and bufuralol (human CYP2D6 substrate). In addition, cynomolgus CYP3A4 and CYP3A5 also exhibits wider substrate selectivity toward human CYP2D6 and CYP2E1 substrates. These enzymes may be responsible for species difference in drug metabolism between cynomolgus monkeys and humans. The comparative data presented here can be helpful for designing in vivo metabolic assays using cynomolgus monkeys in terms of substrate specificity and inhibitor selectivity.
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Emoto C, Yoda N, Uno Y, Iwasaki K, Umehara K, Kashiyama E, Yamazaki H. Comparison of P450 Enzymes Between Cynomolgus Monkeys and Humans: P450 Identities, Protein Contents, Kinetic Parameters, and Potential for Inhibitory Profiles. Curr Drug Metab 2013. [DOI: 10.2174/138920013804870664] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Emoto C, Yoda N, Uno Y, Iwasaki K, Umehara K, Kashiyama E, Yamazaki H. Comparison of P450 Enzymes Between Cynomolgus Monkeys and Humans: P450 Identities, Protein Contents, Kinetic Parameters, and Potential for Inhibitory Profiles. Curr Drug Metab 2013. [DOI: 10.2174/1389200211314020012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Iwasaki K, Obara W, Kato Y, Takata R, Tanji S, Fujioka T. Neoadjuvant Gemcitabine Plus Carboplatin for Locally Advanced Bladder Cancer. Jpn J Clin Oncol 2012; 43:193-9. [DOI: 10.1093/jjco/hys213] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Hosoi Y, Uno Y, Murayama N, Fujino H, Shukuya M, Iwasaki K, Shimizu M, Utoh M, Yamazaki H. Monkey liver cytochrome P450 2C19 is involved in R- and S-warfarin 7-hydroxylation. Biochem Pharmacol 2012; 84:1691-5. [PMID: 23041648 DOI: 10.1016/j.bcp.2012.09.026] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2012] [Revised: 09/25/2012] [Accepted: 09/25/2012] [Indexed: 02/06/2023]
Abstract
Cynomolgus monkeys are widely used as primate models in preclinical studies. However, some differences are occasionally seen between monkeys and humans in the activities of cytochrome P450 enzymes. R- and S-warfarin are model substrates for stereoselective oxidation in humans. In this current research, the activities of monkey liver microsomes and 14 recombinantly expressed monkey cytochrome P450 enzymes were analyzed with respect to R- and S-warfarin 6- and 7-hydroxylation. Monkey liver microsomes efficiently mediated both R- and S-warfarin 7-hydroxylation, in contrast to human liver microsomes, which preferentially catalyzed S-warfarin 7-hydroxylation. R-Warfarin 7-hydroxylation activities in monkey liver microsomes were not inhibited by α-naphthoflavone or ketoconazole, and were roughly correlated with P450 2C19 levels and flurbiprofen 4-hydroxylation activities in microsomes from 20 monkey livers. In contrast, S-warfarin 7-hydroxylation activities were not correlated with the four marker drug oxidation activities used. Among the 14 recombinantly expressed monkey P450 enzymes tested, P450 2C19 had the highest activities for R- and S-warfarin 7-hydroxylations. Monkey P450 3A4 and 3A5 slowly mediated R- and S-warfarin 6-hydroxylations. Kinetic analysis revealed that monkey P450 2C19 had high V(max) and low K(m) values for R-warfarin 7-hydroxylation, comparable to those for monkey liver microsomes. Monkey P450 2C19 also mediated S-warfarin 7-hydroxylation with V(max) and V(max)/K(m) values comparable to those for recombinant human P450 2C9. R-warfarin could dock favorably into monkey P450 2C19 modeled. These results collectively suggest high activities for monkey liver P450 2C19 toward R- and S-warfarin 6- and 7-hydroxylation in contrast to the saturation kinetics of human P450 2C9-mediated S-warfarin 7-hydroxylation.
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Bhakta JN, Ohnishi K, Munekage Y, Iwasaki K, Wei MQ. Characterization of lactic acid bacteria-based probiotics as potential heavy metal sorbents. J Appl Microbiol 2012; 112:1193-206. [PMID: 22404232 DOI: 10.1111/j.1365-2672.2012.05284.x] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
AIM To isolate and characterize lactic acid bacteria (LAB) and determine whether they could potentially be used as heavy metal (cadmium and lead) absorbing probiotics. METHODS AND RESULTS The study used 53 environmental (mud and sludge) samples to isolate cadmium- and lead-resistant LAB, by following spared plate technique. A total of 255 cadmium- and lead-resistant LAB were isolated from these samples. The survival of 26 of the LAB was found after passing through sequential probiotic characterizations. These 26 probiotic LAB exhibited remarkable variations in their metal-resistant and metal-removal abilities. Of 26, seven (Cd54-2, Cd61-7, Cd69-12, Cd70-13, Pb82-8, Pb96-19 and Cd109-16) and four (Pb71-1, Pb73-2, Pb85-9 and Pb96-19) strains displayed relatively elevated cadmium- and lead-removal efficiencies from water, respectively, compare with that of the remaining strains. Strains Cd70-13 and Pb71-1 showed the highest cadmium (25%) and lead (59%) removal capacity from MRS (De Man, Rogosa and Sharpe) culture medium, respectively, amongst the selected strains and showed a good adhesive ability on fish mucus. A phylogenetic analysis of their 16S rDNA sequences revealed that the strains Cd70-13 and Pb71-1 belong to Lactobacillus reuteri. CONCLUSION Excellent probiotic, metal sorption and adhesive characteristics of newly identified Lact. reuteri strains Cd70-13 and Pb71-1 were isolated, which indicated their high potential abilities to survive in the intestinal milieu and to uptake the tested metals from the environment. SIGNIFICANCE AND IMPACT OF THE STUDY To our knowledge, this is the first study that has aimed to isolate, characterize and identify metal-resistant LAB strains that have potential to be a probiotic candidate for food and in vivo challenge studies in the intestinal milieu of fish for the uptake and control of heavy metal bioaccumulation.
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Iwasaki K, Kikuchi A, Takeda A, Satoh T, Sawada JI, Konno H, Takahashi T, Takayama S, Tobita M, Yaegashi N. 1.257 A CROSSOVER STUDY OF A TRADITIONAL ASIAN HERBAL MEDICINE FOR HUNTINGTON'S DISEASE. Parkinsonism Relat Disord 2012. [DOI: 10.1016/s1353-8020(11)70315-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Sawabe M, Aoki A, Komaki M, Iwasaki K, Ogita M, Izumi Y. Gingival healing following Er:YAG laser ablation Vs electrosurgery in rats. Med Oral Patol Oral Cir Bucal 2012. [DOI: 10.4317/medoral.17643734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022] Open
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