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Umeda I, Hayashi T, Ishiwatari H, Yoshida M, Miyanishi K, Sato Y, Kofune M, Takimoto R, Kato J, Meguro M, Hirata K. [A case of severe acute pancreatitis and ischemic gastropathy caused by acute aortic dissection]. Nihon Shokakibyo Gakkai Zasshi 2011; 108:103-110. [PMID: 21212601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A 49-year-old man presented with chest pain and was given a diagnosis of aortic dissection based on computed tomography (CT) findings. Two days later the dissection reached the origin of the celiac artery and there was poor blood flow from the body to the tail of the pancreas and fundus of the stomach wall. Severe acute pancreatitis developed. Endoscopy showed a near-circumferential gastric ulcer in the gastric cardia and we diagnosed ischemic gastropathy. A fistula between the area of infected pancreatic necrosis and the stomach had formed spontaneously and the necrotic tissue was draining into the stomach. His recovery was uneventful.
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Affiliation(s)
- Ikumi Umeda
- Fourth Department of Internal Medicine, Sapporo Medical University
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Fujimi A, Kanisawa Y, Kikuchi S, Okuda T, Sato Y, Doi T, Ohta H, Umeda I, Nobuoka A. [Identification of clonal proliferation of T cell and FIP1L1-PDGFRalpha fusion gene in hypereosinophilic syndrome associated with lymphomatoid papulosis which showed rapid and complete response to the treatment with imatinib]. ACTA ACUST UNITED AC 2007; 96:2794-7. [PMID: 18203417 DOI: 10.2169/naika.96.2794] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Akihito Fujimi
- Department of Hematology, Oji General Hospital, Tomakomai
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Umeda I, Ohta H, Doi T, Nobuoka A, Kanisawa Y, Kawasaki R, Iwai K. Idiopathic intramural hematoma of the colon. Gastrointest Endosc 2007; 66:861-4. [PMID: 17719037 DOI: 10.1016/j.gie.2007.02.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2006] [Accepted: 02/01/2007] [Indexed: 12/10/2022]
Affiliation(s)
- Ikumi Umeda
- Hakodate Red Cross Hospital, Hakodate-city, Hokkaido, Japan
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Oku T, Maeda M, Ihara H, Umeda I, Kitaoka K, Waga E, Wada Y, Katsuki S, Nagamachi Y, Niitsu Y. Clinical and endoscopic features of acute hemorrhagic rectal ulcer. J Gastroenterol 2006; 41:962-70. [PMID: 17096065 DOI: 10.1007/s00535-006-1886-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/07/2006] [Accepted: 07/31/2006] [Indexed: 02/04/2023]
Abstract
BACKGROUND Acute hemorrhagic rectal ulcer (AHRU) has increasingly been reported in Japan, whereas it has rarely been reported in the English literature and is not yet established as a disease entity. The aim of this study was to elucidate clinical and endoscopic characteristics of patients with AHRU. METHODS We enrolled 20 patients with 26 ulcers diagnosed as AHRU in our department between January 2001 and October 2005. Clinical features such as the underlying disorder, Karnofsky performance status (PS), and presence or absence of anticoagulant or antiplatelet therapy, as well as endoscopic findings and type of bleeding, were evaluated. Strategies for hemostasis were also reviewed. RESULTS The most prevalent underlying disorder was diabetes mellitus, and the number of bedridden patients with PS 4 was relatively high. In addition, more than half of the patients had been treated with anticoagulant or antiplatelet agents. Endoscopically, ulcers were characteristically solitary and irregularly shaped, and they did not show any typical localization pattern. As a hemostatic strategy, clipping alone showed a favorable result, with a hemostatic success rate as high as 76.9%. CONCLUSIONS This study may support the establishment of AHRU as a new clinical entity. In aged patients being treated with anticoagulant or antiplatelet agents, especially bedridden patients using aspirin, the possible appearance of this disease should be kept in mind.
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Affiliation(s)
- Takatomi Oku
- Department of Gastroenterology, Shinnittetsu Muroran General Hospital, 1-45 Chiribetsu, Muroran, Japan
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Umeda I, Kanisawa Y, Ohta H, Nobuoka A, Doi T, Watanabe N, Iwai K, Kawasaki R. [Fever: an atypical manifestation of gastric inflammatory fibroid polyp]. Nihon Naika Gakkai Zasshi 2006; 95:1551-3. [PMID: 16955942 DOI: 10.2169/naika.95.1551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/11/2023]
Affiliation(s)
- Ikumi Umeda
- Department of Gastroenterology, Oji General Hospital, Tomakomai
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Wang JD, Umeda I, Lin CC, Chen HC, Chou CM, Chi CS. Gastrointestinal: rare complications of Meckel's diverticula. J Gastroenterol Hepatol 2006; 21:477. [PMID: 16509881 DOI: 10.1111/j.1440-1746.2006.04275.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
Affiliation(s)
- J-D Wang
- Department of Pediatrics, Taichung Veterans General Hospital, Taiwan
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Noyori R, Umeda I, Ishigami T. Selective hydrogenation of .alpha.,.beta.-unsaturated carbonyl compounds via hydridoiron complexes. J Org Chem 2002. [DOI: 10.1021/jo00975a017] [Citation(s) in RCA: 93] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Noyori R, Umeda I, Kawauchi H, Takaya H. Nickel-catalyzed reactions involving strained bond. XII. Nickel(0)-catalyzed reaction of quadricyclane with electron-deficient olefins. J Am Chem Soc 2002. [DOI: 10.1021/ja00837a022] [Citation(s) in RCA: 50] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Masubuchi K, Taniguchi M, Umeda I, Hattori K, Suda H, Kohchi Y, Isshiki Y, Sakai T, Kohchi M, Shirai M, Okabe H, Sudoh M, Yamazaki T, Shimma N. Synthesis and structure-activity relationships of novel fungal chitin synthase inhibitors. Bioorg Med Chem Lett 2000; 10:1459-62. [PMID: 10888332 DOI: 10.1016/s0960-894x(00)00257-2] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A novel Candida albicans chitin synthase 1 (CaChs1) inhibitor, RO-41-0986 (1) was discovered by random screening. Systematic modification led to the identification of a highly potent CaChs1 inhibitor, RO-09-3024 (2), having strong antifungal activity against Candida spp. in vitro.
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Affiliation(s)
- K Masubuchi
- Department of Chemistry, Nippon Roche Research Center, Kamakura, Kanagawa, Japan
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Shimma N, Umeda I, Arasaki M, Murasaki C, Masubuchi K, Kohchi Y, Miwa M, Ura M, Sawada N, Tahara H, Kuruma I, Horii I, Ishitsuka H. The design and synthesis of a new tumor-selective fluoropyrimidine carbamate, capecitabine. Bioorg Med Chem 2000; 8:1697-706. [PMID: 10976516 DOI: 10.1016/s0968-0896(00)00087-0] [Citation(s) in RCA: 106] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
To identify an orally available fluoropyrimidine having efficacy and safety profiles greatly improved over those of parenteral 5-fluorouracil (5-FU: 1), we designed a 5-FU prodrug that would pass intact through the intestinal mucisa and be sequentially converted to 5-FU by enzymes that are highly expressed in the human liver and then in tumors. Among various N4-substituted 5'-deoxy-5-fluorocytidine derivatives, a series of N4-alkoxycarbonyl derivatives were hydrolyzed to 5'-deoxy-5-fluorocytidine (5'-DFCR: 8) specifically by carboxylesterase, which exists preferentially in the liver in humans and monkeys. Particularly, derivatives having an N4-alkoxylcarbonyl moiety with a C4-C6 alkyl chain were the most susceptible to the human carboxylesterase. Those were then converted to 5'-deoxy-5-fluorouridine (5'-DFUR: 4) by cytidine deaminase highly expressed in the liver and solid tumors and finally to 5-FU by thymidine phosphorylase (dThdPase) preferentially located in tumors. When administered orally to monkeys, a derivative having the N4-alkoxylcarbonyl moiety with a C5 alkyl chain (capecitabine: 6) The highest AUC and Cmax for plasma 5'-DFUR. In tests with various human cancer xenograft models, capecitabine was more efficacious at wider dose ranges than either 5-FU or 5'-DFUR and was significantly less toxic to the intestinal tract than the others in monkeys.
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Affiliation(s)
- N Shimma
- Department of Chemistry, Nippon Roche Research Center, Kamakura City, Kanagawa, Japan.
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Miwa M, Ura M, Nishida M, Sawada N, Ishikawa T, Mori K, Shimma N, Umeda I, Ishitsuka H. Design of a novel oral fluoropyrimidine carbamate, capecitabine, which generates 5-fluorouracil selectively in tumours by enzymes concentrated in human liver and cancer tissue. Eur J Cancer 1998; 34:1274-81. [PMID: 9849491 DOI: 10.1016/s0959-8049(98)00058-6] [Citation(s) in RCA: 908] [Impact Index Per Article: 34.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Capecitabine (N4-pentyloxycarbonyl-5'-deoxy-5-fluorocytidine) is a novel oral fluoropyrimidine carbamate, which is converted to 5-fluorouracil (5-FU) selectively in tumours through a cascade of three enzymes. The present study investigated tissue localisation of the three enzymes in humans, which was helpful for us to design the compound. Carboxylesterase was almost exclusively located in the liver and hepatoma, but not in other tumours and normal tissue adjacent to the tumours. Cytidine (Cyd) deaminase was located in high concentrations in the liver and various types of solid tumours. Finally, thymidine phosphorylase (dThdPase) was also more concentrated in various types of tumour tissues than in normal tissues. These unique tissue localisation patterns enabled us to design capecitabine. Oral capecitabine would pass intact through the intestinal tract, but would be converted first by carboxylesterase to 5'-deoxy-5-fluorocytidine (5'-dFCyd) in the liver, then by Cyd deaminase to 5'-deoxy-5-fluorouridine (5'-dFUrd) in the liver and tumour tissues and finally by dThdPase to 5-FU in tumours. In cultures of human cancer cell lines, the highest level of cytotoxicity was shown by 5-FU itself, followed by 5'-dFUrd. Capecitabine and 5'-dFCyd had weak cytotoxic activity only at high concentrations. The cytotoxicity of the intermediate metabolites 5'-dFCyd and 5'-dFCyd was suppressed by inhibitors of Cyd deaminase and dThdPase, respectively, indicating that these metabolites become effective only after their conversion to 5-FU. Capecitabine, which is finally converted to 5-FU by dThdPase in tumours, should be much safer and more effective than 5-FU, and this was indeed the case in the HCT116 human colon cancer and the MX-1 breast cancer xenograft models.
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Affiliation(s)
- M Miwa
- Nippon Roche Research Centre, Kanagawa, Japan
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12
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Ohwada J, Umeda I, Ontsuka H, Aoki Y, Shimma N. Synthesis and structure-activity relationships of a novel antifungal agent, azoxybacilin. Chem Pharm Bull (Tokyo) 1994; 42:1703-5. [PMID: 7954924 DOI: 10.1248/cpb.42.1703] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
A new antifungal substance, azoxybacilin (an unusual amino acid with an azoxy moiety) and its derivatives have been synthesized from Boc-L-Asp-OtBu utilizing the Moss procedure for the preparation of the azoxy moiety. The ester derivative, Ro 09-1824, showed more potent antifungal activity and a broader antifungal spectrum than azoxybacilin did.
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Affiliation(s)
- J Ohwada
- Nippon Roche Research Center, Kamakura, Japan
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Umeda I, Hayakawa H, Kamiya S, Tanabe Y. Novel lighting systems stimulating Gonadal development and expediting sexual maturity on male and female chickens. Asian Australas J Anim Sci 1993. [DOI: 10.5713/ajas.1993.127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Kuriyama H, Umeda I, Kobayashi H. Role of cations in the flocculation of Saccharomyces cerevisiae and discrimination of the corresponding proteins. Can J Microbiol 1991; 37:397-403. [PMID: 1878818 DOI: 10.1139/m91-064] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Asexual yeast flocculation was studied using strong flocculents of Saccharomyces cerevisiae. The inhibitory effect of cations on flocculation is considered to be caused by competition between those cations and Ca2+ at the binding site of the Ca(2+)-requiring protein that is involved in flocculation. Inhibition of flocculation by various cations occurred in the following order: La3+, Sr2+, Ba2+, Mn2+, Al3+, and Na+. Cations such as Mg2+, Co2+, and K+ promoted flocculation. This promoting effect may be based on the reduction of electrostatic repulsive force between cells caused by binding of these cations anionic groups present on the cell surface. In flocculation induced by these cations, trace amounts of Ca2+ excreted on the cell surface may activate the corresponding protein. The ratio of Sr2+/Ca2+ below which cells flocculated varied among strains: for strains having the FLO5 gene, it was 400 to 500; for strains having the FLO1 gene, about 150; and for two alcohol yeast strains, 40 to 50. This suggests that there are several different types of cell surface proteins involved in flocculation in different yeast strains.
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Affiliation(s)
- H Kuriyama
- Fermentation Research Institute, Tsukuba, Japan
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Nishioka R, Umeda I, Oi N, Tabata S, Uno K. Determination of felodipine and its metabolites in plasma using capillary gas chromatography with electron-capture detection and their identification by gas chromatography-mass spectrometry. J Chromatogr 1991; 565:237-46. [PMID: 1874870 DOI: 10.1016/0378-4347(91)80386-q] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
A novel method for the determination of felodipine and its metabolites in plasma by capillary gas chromatography (GC) with electron capture detection was developed. Felodipine and its oxidized metabolite were assayed by capillary GC after solid-phase extraction with the aid of a cool on-column injection technique. Acid metabolites, methyl monoacid and ethyl monoacid and diacid, were extracted with diethyl ether and propylated with 1-n-propyl-3-p-tolyltriazene before being submitted to capillary GC. These methods were very sensitive and useful for the pharmacokinetic study of felodipine. Felodipine and its metabolites were identified by GC-mass spectrometry. The mass spectral patterns of the peaks of extracts from human plasma samples after oral administration of felodipine were in good agreement with those of reference compounds.
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Affiliation(s)
- R Nishioka
- Sumika Chemical Analysis Service Limited, Osaka, Japan
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Miwa M, Ishikawa T, Eda H, Ryu M, Fujimoto K, Ninomiya Y, Umeda I, Yokose K, Ishitsuka H. Comparative studies on the antitumor and immunosuppressive effects of the new fluorouracil derivative N4-trimethoxybenzoyl-5'-deoxy-5-fluorocytidine and its parent drug 5'-deoxy-5-fluorouridine. Chem Pharm Bull (Tokyo) 1990; 38:998-1003. [PMID: 2143107 DOI: 10.1248/cpb.38.998] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
N4-Trimethoxybenzoyl-5'-deoxy-5-fluorocytidine (Ro 09-1390), a new prodrug of 5'-deoxy-5-fluorouridine (5'-dFUrd), was synthesized for the purpose of finding a drug with less intestinal toxicity than the parent compound. The present study compared the antitumor activity and immunotoxicity of Ro 09-1390 with those of 5'-dFUrd, 5-fluorouracil (5-FUra) and tegafur in various transplantable tumor models. The antitumor efficacy of Ro 09-1390 was comparable to 5'-dFUrd and these two agents were much more effective than the others. However, Ro 09-1390 was much less toxic to the intestinal tract and less immunosuppressive in both humoral and cellular immune reactions than 5'-dFUrd. Consequently, Ro 09-1390 showed higher therapeutic indices and higher efficacy than 5'-dFUrd at high dosages. The antitumor spectrum of Ro 09-1390 was somewhat different from that of 5'-dFUrd, though it shows the efficacy after it converts to 5'-dFUrd. The activity of Ro 09-1390 was partly associated with cytidine deaminase in the tumors treated. Ro 09-1390 appeared to be more effective against tumors with a high concentration of the enzyme by which the major metabolite 5'-deoxy-5-fluorocytidine (5'-dFCyd) is metabolized to 5'-dFUrd.
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Affiliation(s)
- M Miwa
- Nippon Roche Research Center, Kanagawa, Japan
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17
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Nishioka R, Harimoto T, Umeda I, Yamamoto S, Oi N. Improved procedure for determination of indomethacin in plasma by capillary gas chromatography after solid-phase extraction. J Chromatogr 1990; 526:210-4. [PMID: 2341534 DOI: 10.1016/s0378-4347(00)82500-1] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- R Nishioka
- Sumika Chemical Analysis Service, Ltd., Osaka, Japan
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Ninomiya Y, Miwa M, Eda H, Sahara H, Fujimoto K, Ishida M, Umeda I, Yokose K, Ishitsuka H. Comparative antitumor activity and intestinal toxicity of 5'-deoxy-5-fluorouridine and its prodrug trimethoxybenzoyl-5'-deoxy-5-fluorocytidine. Jpn J Cancer Res 1990; 81:188-95. [PMID: 2139643 PMCID: PMC5963899 DOI: 10.1111/j.1349-7006.1990.tb02547.x] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
N4-Trimethoxybenzoyl-5'-deoxy-5-fluorocytidine (Ro 09-1390), a prodrug of the cytostatic 5'-deoxy-5-fluorouridine (5'-DFUR), was synthesized with the aim of reducing of the dose-limiting toxicity of 5'-DFUR, which is diarrhea. In mice bearing Lewis lung carcinoma, 5'-DFUR given po produced a substantial amount of 5-fluorouracil (5-FU) in the intestinal tract as well as tumors, where the enzyme pyrimidine nucleoside phosphorylase, essential for conversion of 5'-DFUR to 5-FU, is predominantly located. With the oral administration of Ro 09-1390 only a small amount of 5-FU was formed in the intestine; however, the administration of Ro 09-1390 and 5'-DFUR at the same dose produced similar amounts of 5-FU in tumor tissues. These differences in metabolism were reflected in their toxicity and antitumor efficacy. The administration of 5'-DFUR resulted in damage to the intestinal mucosal membrane and diarrhea in normal mice, whereas Ro 09-1390 was much less toxic to the intestinal tract. As regards antitumor activity, Ro 09-1390 and 5'-DFUR at equivalent doses inhibited the growth of Lewis lung carcinoma to similar extents. Since Ro 09-1390 was much less toxic to the intestinal tract than 5'-DFUR, mice bearing Lewis lung carcinoma could be given Ro 09-1390 daily over a longer period and at a higher dose, resulting in a longer survival time.
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Tanaka H, Yoneyama Y, Sugawara M, Umeda I, Ohta Y. Enzyme immunoassay discrimination of a new angiotensin-converting enzyme (ACE) inhibitor, cilazapril, and its active metabolite. J Pharm Sci 1987; 76:224-7. [PMID: 3035170 DOI: 10.1002/jps.2600760308] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Simple and sensitive enzyme immunoassays (EIAs), discriminating a new angiotensin-converting enzyme (ACE) inhibitor, cilazapril [9(s) - [1(s)-(ethoxycarbonyl)-3-phenylpropylamino]-octahydro-10-oxo-6H- pyridazo[1,2-a] [1,2]diazepine-1(s)carboxylic acid] and its active metabolite [9(s)-[1(s)-carboxy-3-phenylpropylamino]-octahydro-10-oxo-6H- pyridazo[1,2-a][1,2]diazepine-1(s)carboxylic acid] were developed for pharmacokinetic studies of this drug which is used as an antihypertensive agent. These assays can be performed directly on serum or plasma specimens without pretreatment. The EIA for cilazapril (prodrug) allowed the determination of as little as 30 pg/mL, while a 1000-times greater concentration of its active metabolite was required to achieve the same extent of inhibition. The EIA for the active metabolite exhibited a sensitivity and specificity similar to those of the prodrug. Plasma specimens from a human volunteer study and a marmoset subacute toxicity study were assayed by these two newly developed EIAs. The plasma levels of active metabolite determined by the EIA were compared with those assayed by radioenzymatic assay, and a good correlation was observed between them.
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Ninomiya Y, Ohsawa C, Aoyama M, Umeda I, Suhara Y, Ishitsuka H. Antivirus agent, Ro 09-0410, binds to rhinovirus specifically and stabilizes the virus conformation. Virology 1984; 134:269-76. [PMID: 6100571 DOI: 10.1016/0042-6822(84)90296-4] [Citation(s) in RCA: 52] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The antiviral mechanisms of Ro 09-0410 (4'-ethoxy-2'-hydroxy-4,6'-dimethoxychalcone), which inactivates rhinovirus exclusively, have been investigated. It was suggested that Ro 09-0410 bound to human rhinovirus type 2 (HRV-2) and made it inactive, since the reduced infectivity was completely restored to original levels by extraction of the agent with chloroform [H. Ishitsuka, Y. Ninomiya, C. Ohsawa, M. Fujiu, and Y. Suhara (1982) Antimicrob. Agents Chemother. 22, 617-621]. This was confirmed using radioactively labeled Ro 09-0410 and HRV-2. HRV-2 was inactive while bound to the agent, whereas a subline of HRV-2 resistant to the agent had no binding site for the agent. Ro 09-0410 appeared to bind to some specific site(s) on the virion of susceptible virus strains. Treatment of rhinovirus at pH 5 or 56 degrees caused a change of the virion size and greatly reduced its infectivity. Ro 09-0410 could no longer bind to HRV-2 after such treatment. On the other hand, when the virion bound with Ro 09-0410 was treated at pH 5 or 56 degrees, the Ro 09-0410 remained bound and the conformational alteration of the virion did not take place. Furthermore, Ro 09-0410 protected HRV-2 from the reduction of infectivity caused by mild acid or heat treatment, as revealed by infectivity measurements after extraction of the agent with chloroform. These results suggest that Ro 09-0410 binds to the HRV-2 virion and prevents viral replication in the cell.
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Yokose K, Ogawa K, Suzuki Y, Umeda I, Suhara Y. New alpha-amylase inhibitor, trestatins. II. Structure determination of trestatins A, B and C. J Antibiot (Tokyo) 1983; 36:1166-75. [PMID: 6605334 DOI: 10.7164/antibiotics.36.1166] [Citation(s) in RCA: 28] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
The structures of trestatins A (C56H94N2O40), B (C37H63NO28) and C (C75H125N3O52), new basic oligosaccharides with potent inhibitory activity against various alpha-amylases, have been shown by spectroscopic and chemical methods to be 1, 2 and 3, respectively.
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Abstract
Ro 09-0179 (4',5-dihydroxy-3,3',7-trimethoxyflavone), isolated from a Chinese medicinal herb, was found to have potent antiviral activity. It selectively inhibited the replication of human picornaviruses, such as rhinoviruses and coxsackieviruses in tissue culture, but not other DNA and RNA viruses. Ro 09-0298 (4',5-diacetyloxy-3,3',7-trimethoxyflavone), an orally active derivative of Ro 09-0179, prevented coxsackievirus (B1) infection in mice. The critical time for the inhibition of rhinovirus replication by Ro 09-0179 was 2 to 4 h after virus adsorption, i.e., in the early stages of virus replication. It markedly inhibited coxsackievirus and rhinovirus RNA synthesis in infected HeLa cells, but not in a cell-free system using the RNA polymerase complex isolated from the infected cells. In the infected cells, the RNA polymerase complex was not formed in the presence of Ro 09-0179. Therefore, it is suggested that Ro 09-0179 interferes with some process of viral replication which occurs between viral uncoating and the initiation of viral RNA synthesis.
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Yoshitake A, Kawahara K, Shono F, Umeda I, Izawa A, Komatsu T. Determination of miloxacin and metabolites in human serum and urine by high-pressure liquid chromatography. Antimicrob Agents Chemother 1980; 18:45-9. [PMID: 7416751 PMCID: PMC283937 DOI: 10.1128/aac.18.1.45] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023] Open
Abstract
A sensitive and reliable high-pressure liquid chromatography (HPLC) assay for miloxacin and its two principal metabolites, 5,8-dihydro-8-oxo-2H-1,3-dioxolo[4,5-g]quinoline-7-carboxylic acid (M-1) and 1,4-dihydro-1,6-dimethoxy-7-hydroxy-4-oxoquinoline-3-carboxylic acid (M-2), in human serum and urine was developed. A strong anion-exchange Zipax SAX column using a mobile phase of 0.01 M citric acid solution containing 0.03 M sodium nitrate with pH 5.0 was used to achieve separation of the three compounds. The retention times of miloxacin, M-1, and M-2 were 3.8, 9.3, and 5.9 min, respectively. Serum and urine concentrations of these compounds as low as 10 ng/ml were measured. When results from the HPLC assay were compared with those from the microbiological assay of serum and urine samples from human subjects receiving miloxacin orally, the correlation coefficients were 0.94 for the serum and 0.99 for the urine. The HPLC assay method presents an alternative to the microbiological assay and permits future pharmacokinetic investigations of miloxacin.
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Umeda I, Anzai H, Murano A, Noguchi H. [Analytical studies on beta-lactam antibiotics. I. determination of semisynthetic penicillins by iodometric method (author's transl)]. YAKUGAKU ZASSHI 1979; 99:717-22. [PMID: 544789 DOI: 10.1248/yakushi1947.99.7_717] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Umeda I, Anzai H, Murano A. [Determination of a new antibacterial agent miloxacin by high performance liquid chromatography and ultraviolet spectrophotometry (author's transl)]. YAKUGAKU ZASSHI 1979; 99:770-4. [PMID: 544795 DOI: 10.1248/yakushi1947.99.7_770] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Umeda I, Murano A. [Analytical studies on beta-lactam antibiotics. II. Determination of semisynthetic penicillins PC-904 and PC-462 by high performance liquid chromatography (author's transl)]. YAKUGAKU ZASSHI 1979; 99:765-9. [PMID: 544794 DOI: 10.1248/yakushi1947.99.7_765] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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Shimizu H, Ichishita H, Umeda I. Inhibition of glutamate-elicited accumulation of adenosine cyclic 3',5'-monophosphate in brain slices by alpha, omega-diaminocarboxylic acids. Mol Pharmacol 1975; 11:866-73. [PMID: 173984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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Shimizu H, Ichishita H, Tateishi M, Umeda I. Characteristics of the amino acid receptor site mediating formation of cyclic adenosine 3',5'-monophosphate in mammalian brains. Mol Pharmacol 1975; 11:223-31. [PMID: 164618] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022] Open
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Noyori R, Kumagai Y, Umeda I, Takaya H. Localization of tyrosine at the binding site of neurophysin II by negative nuclear Overhauser effects. J Am Chem Soc 1972; 94:4017-20. [PMID: 5037990 DOI: 10.1021/ja00766a065] [Citation(s) in RCA: 99] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
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Umeda I, Toyoda Y, Nakano Y, Yamaki H, Fuse T, Miura T, Furuta Y. Mockup experiments for the irregular shield of the first nuclear ship of Japan. Nuclear Engineering and Design 1968. [DOI: 10.1016/0029-5493(68)90056-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Oi N, Umeda I. [Analytical studies on pesticides by infrared spectroscopy. II. Determination of residues of sumithion and methylparathion in mixture]. YAKUGAKU ZASSHI 1966; 86:78-9. [PMID: 5948837 DOI: 10.1248/yakushi1947.86.1_78] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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Oi N, Umeda I. [Analyses of drugs and chemicals by infrared absorption spectroscopy. IV. Determination of vitamin A acid isomers in mixtures]. YAKUGAKU ZASSHI 1965; 85:998-1001. [PMID: 5893843 DOI: 10.1248/yakushi1947.85.11_998] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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