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Luu MN, Imoto A, Matsuo Y, Huy NT, Qarawi A, Alhady STM, Truong LV, Yoshino R, Duc NTM, Tabei K, Lu Y, Singh MK, Truong MP, Dumre SP, Rocha ICN, Hung IC, Fudo A, Sato M, Kansakar S, Tsukamoto A, Komatsu A, Cai G, Moji K, Khongyot T, Mogan S, Soukdavone S, Hartuti ED, Thidatheb K, Honda S, Woo H, Lama N, Huynh VTN, Khoa HLA, Abbas KS, Monib FA, Omran HAM, Rezq CS, Qatora MS, Jia Ng S, Morena GJV, Miranda AV, Ngo Huynh MT, Ota J, Minjung K, An J, Vorlasane L, Gunasegaran K, Zulkefli F, Lima Girón BDJ, Bhattachan PG, Dumre RB, Pandey K, Yamashita S, Seposo AKC, Zabala J, Riva-Moscoso A, Ordóñez JNP, Uitrakul S, Principe-Meneses FS, Dila KAS. Anxiety and its risk factors among non-Japanese residents living in Japan undergoing COVID-19 situation: A cross-sectional survey. PLoS One 2024; 19:e0280144. [PMID: 38489310 PMCID: PMC10942066 DOI: 10.1371/journal.pone.0280144] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2022] [Accepted: 12/21/2022] [Indexed: 03/17/2024] Open
Abstract
INTRODUCTION In the context of collective efforts taken in Japan to control the spread of COVID-19, the state of emergency and social distancing have caused a negative impact on the mental health of all residents, including foreign communities in Japan. This study aimed to evaluate the level of anxiety and its associated factors among non-Japanese residents residing in Japan during the COVID-19 pandemic. METHODS A web-based survey in 13 languages was conducted among non-Japanese residents living in Japan during the COVID-19 situation. The State-Trait Anxiety Inventory assessed the level of anxiety-State (STAI-S) scores prorated from its six-item version. The multivariable logistic regression using the Akaike Information Criterion (AIC) method was performed to identify the associated factors of anxiety among participants. RESULTS From January to March 2021, we collected 392 responses. A total of 357 valid responses were analyzed. 54.6% of participants suffered from clinically significant anxiety (CSA). In multivariable logistic model analysis, the CSA status or the high level of anxiety was associated with three factors, including having troubles/difficulties in learning or working, decreased sleep duration, and decreased overall physical health (p<0.05). CONCLUSION Our study suggests several possible risk factors of anxiety among non-Japanese residents living in Japan undergoing the COVID-19 pandemic, including the troubles or difficulties in learning or working, the decrease in sleep duration, and the decrease in overall physical health.
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Affiliation(s)
- Mai Ngoc Luu
- Department of Internal Medicine, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Atsuko Imoto
- School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Japan
| | | | - Nguyen Tien Huy
- School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Japan
| | - Ahmad Qarawi
- Essen Healthcare, Bronx, NY, United States of America
| | | | - Le Van Truong
- Traditional Medicine Hospital, Ministry of Public Security, Hanoi, Vietnam
| | - Ryuji Yoshino
- School of Global Humanities and Social Sciences, Nagasaki University, Nagasaki, Japan
| | - Nguyen Tran Minh Duc
- Faculty of Medicine, University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | | | - Yixiao Lu
- Department of Public Health, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Manmeet Kaur Singh
- American University of the Caribbean Medical School, Cupe Coy, Sint Maarten
| | - Mai Phuong Truong
- American University of the Caribbean Medical School, Cupe Coy, Sint Maarten
| | | | | | | | - Akane Fudo
- Independent Researcher, Nagasaki Prefecture, Japan
| | - Miho Sato
- School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Japan
- School of Global Humanities and Social Sciences, Nagasaki University, Nagasaki, Japan
| | - Sajog Kansakar
- Department of Internal Medicine, Maimonides Medical Center, Brooklyn, New York, United States of America
| | - Akiko Tsukamoto
- School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Japan
| | - Aiko Komatsu
- School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Japan
| | - Guoxi Cai
- Nagasaki Prefectural Institute of Environment and Public Health, Nagasaki, Japan
| | - Kazuhiko Moji
- School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Japan
- School of Global Humanities and Social Sciences, Nagasaki University, Nagasaki, Japan
| | - Thanawat Khongyot
- School of Pharmacy, Walailak University, Nakhon Si Thammarat, Thailand
| | - Saruveish Mogan
- Faculty of Medicine and Health Science, Universiti Malaysia Sarawak, Kota Samarahan, Sarawak, Malaysia
| | | | - Endah Dwi Hartuti
- Graduate School of Biomedical Sciences, Program for Nurturing Global Leader, Nagasaki University, Nagasaki, Japan
| | - Kounnavong Thidatheb
- School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Japan
| | - Shiho Honda
- Nagasaki International Student Support Center, Nagasaki University, Nagasaki, Japan
| | - Hyunjae Woo
- Department of Cardiopulmonary Rehabilitation Science, Nagasaki University Graduate School of Biomedical Sciences, Nagasaki, Japan
| | - Nitu Lama
- Dr. M. V. Shetty College of Physiotherapy, Rajiv Gandhi University of Health Sciences, Mangalore, India
| | | | - Huynh Le Anh Khoa
- Department of Biostatistics, Virginia Commonwealth University School of Medicine, Richmond, VA, United States of America
| | | | | | | | | | | | - Sze Jia Ng
- Faculty of Medicine, Crozer-Chester Medical Center, Upland, Pennyslvania, United States of America
| | - Graca Jaqueline Vanessa Morena
- Faculty of Medicine, Trisakti University, Jakarta, Indonesia
- America Evangelical University, Los Angeles, CA, United States of America
| | | | - Minh-Trang Ngo Huynh
- University of Medicine and Pharmacy at Ho Chi Minh City, Ho Chi Minh City, Vietnam
| | - Junko Ota
- School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Japan
| | | | - Jaemin An
- Osaka Ohtani University, Osaka, Japan
| | | | - Kesshinee Gunasegaran
- School of Medicine, University Putra Malaysia, Malaysia, Serdang, Selangor, Malaysia
| | - Fazureen Zulkefli
- School of Medicine, University Putra Malaysia, Malaysia, Serdang, Selangor, Malaysia
| | | | - Punita Gauchan Bhattachan
- Graduate School of Biomedical Sciences, Center for Bioinformatics and Molecular Medicine, Nagasaki University, Nagasaki, Japan
| | - Renu Bhandari Dumre
- School of Tropical Medicine and Global Health, Nagasaki University, Nagasaki, Japan
| | - Kishor Pandey
- Central Department of Zoology, Tribhuvan University, Kathmandu, Nepal
| | | | | | - Jayson Zabala
- Quezon City Science High School, Naruto University of Education, Naruto, Japan
| | - Adrián Riva-Moscoso
- School of Medicine, Universidad Peruana de Ciencias Aplicadas (UPC), Lima, Peru
| | | | - Suriyon Uitrakul
- School of Pharmacy, Walailak University, Nakhon Si Thammarat, Thailand
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Win TZ, Tabei K, Mukadi P, Edwards T, Smith C, Lee N. Corticosteroids for treatment of leptospirosis. Hippokratia 2022. [DOI: 10.1002/14651858.cd014935] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Tin Zar Win
- School of Tropical Medicine and Global Health; Nagasaki University; Nagasaki Japan
| | - Kozue Tabei
- School of Tropical Medicine and Global Health; Nagasaki University; Nagasaki Japan
| | - Patrick Mukadi
- Department of Clinical Medicine; Institute of Tropical Medicine, Nagasaki University; Nagasaki Japan
- Program for Nurturing Global Leaders in Tropical and Emerging Communicable Diseases; Graduate School of Biomedical Sciences, Nagasaki University; Nagasaki Japan
- Institut National de Recherche Biomedicale (INRB); Kinshasa Costa Rica
| | - Tansy Edwards
- Department of Infectious Disease Epidemiology, Faculty of Epidemiology and Population Health; London School of Hygiene & Tropical Medicine; London UK
| | - Chris Smith
- School of Tropical Medicine and Global Health; Nagasaki University; Nagasaki Japan
- Department of Clinical Research, Faculty of Infectious and Tropical Diseases; London School of Hygiene & Tropical Medicine; London UK
| | - Nathaniel Lee
- Hospital for Tropical Diseases; University College London Hospital NHS Foundation Trust; London UK
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Tabei K, Win TZ, Kitashoji E, Brett-Major DM, Edwards T, Smith C, Mukadi P. Antibiotic prophylaxis for leptospirosis. Hippokratia 2022. [DOI: 10.1002/14651858.cd014959] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Kozue Tabei
- School of Tropical Medicine and Global Health; Nagasaki University; Nagasaki Japan
| | - Tin Zar Win
- School of Tropical Medicine and Global Health; Nagasaki University; Nagasaki Japan
| | - Emi Kitashoji
- Department of Clinical Medicine; Institute of Tropical Medicine, Nagasaki University; Nagasaki Japan
| | - David M Brett-Major
- Department of Preventive Medicine and Biometrics; Uniformed Services University; Bethesda MD USA
| | - Tansy Edwards
- Department of Infectious Disease Epidemiology, Faculty of Epidemiology and Population Health; London School of Hygiene & Tropical Medicine; London UK
| | - Chris Smith
- Department of Clinical Research, Faculty of Infectious and Tropical Diseases; London School of Hygiene & Tropical Medicine; London UK
| | - Patrick Mukadi
- Department of Clinical Medicine; Institute of Tropical Medicine, Nagasaki University; Nagasaki Japan
- Program for Nurturing Global Leaders in Tropical and Emerging Communicable Diseases; Graduate School of Biomedical Sciences, Nagasaki University; Nagasaki Japan
- Institut National de Recherche Biomedicale (INRB); Kinshasa DRC
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Tabei K, Kida H, Hosoya T, Satoh M, Tomimoto H. Predicting cognitive decline in Alzheimer’s disease from white matter hyperintensity and single-photon emission computed tomography. J Neurol Sci 2017. [DOI: 10.1016/j.jns.2017.08.2685] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Shinozaki T, Imamura Y, Kohashi R, Dezawa K, Nakaya Y, Sato Y, Watanabe K, Morimoto Y, Shizukuishi T, Abe O, Haji T, Tabei K, Taira M. Spatial and Temporal Brain Responses to Noxious Heat Thermal Stimuli in Burning Mouth Syndrome. J Dent Res 2016; 95:1138-46. [DOI: 10.1177/0022034516653580] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
Burning mouth syndrome (BMS) is an idiopathic orofacial pain condition. Although the pathophysiology of BMS is not clearly understood, central and peripheral neuropathic mechanisms are thought to be involved. The authors compared brain response to noxious heat stimuli in 16 right-handed women with primary BMS and 15 sex- and age-matched right-handed healthy female controls. A thermal stimulus sequence of 32 °C to 40 °C to 32 °C to 49 °C was repeated 4 times in a cycle. Warm and noxious heat stimuli were delivered with a Peltier thermode placed on the right palm or right lower lip for 32 s each in a session. Functional magnetic resonance imaging data were obtained by recording echoplanar images with a block design. Statistical Parametric Mapping 8 software was used to analyze the data. Patients and controls both reported feeling more pain during palm stimulation than during lip stimulation. Repetition of noxious heat stimulus on the lower lip but not on the palm induced habituation in brain activity in the cingulate cortex without reduction in pain perception. Multiple regression analysis revealed a correlation between perceived pain intensity and suppression of brain activity in the anterior cingulate cortex when the repeated thermal sequence was applied at the lower lip. Furthermore, the response of the parahippocampal area differed in BMS patients and controls when the same repeated thermal sequence was applied at the palm. The authors’ findings indicate that BMS patients show specific brain responses due to impaired function of the central and peripheral nervous systems (clinical trial registration: UMIN000015002).
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Affiliation(s)
- T. Shinozaki
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
- Clinical Research Division, Nihon University Dental Research Center, Tokyo, Japan
| | - Y. Imamura
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
- Clinical Research Division, Nihon University Dental Research Center, Tokyo, Japan
| | - R. Kohashi
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - K. Dezawa
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - Y. Nakaya
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - Y. Sato
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - K. Watanabe
- Department of Oral Diagnostic Sciences, Nihon University School of Dentistry, Tokyo, Japan
| | - Y. Morimoto
- Division of Oral and Maxillofacial Radiology, Kyushu Dental University, Kitakyushu, Japan
| | - T. Shizukuishi
- Department of Radiology, Nihon University School of Medicine, Tokyo, Japan
| | - O. Abe
- Department of Radiology, Nihon University School of Medicine, Tokyo, Japan
| | - T. Haji
- Brain Activity Imaging Center, ATR-Promotions Inc., Osaka, Japan
| | - K. Tabei
- Department of Dementia Prevention and Therapeutics, Mie University Graduate School of Medicine, Tsu, Japan
| | - M. Taira
- Department of Cognitive Neurobiology, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
- Center for Brain Integration Research, Tokyo Medical and Dental University, Tokyo, Japan
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Hoshi Y, Itagaki M, Tabei K, Shitanda I. Anodic dissolution of brass and dezincing-resistant brass investigated using channel flow double electrode. J Solid State Electrochem 2015. [DOI: 10.1007/s10008-015-2840-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Onuigbo M, Agbasi N, Wu MJ, Shu KH, Kugler E, Cohen E, Krause I, Goldberg E, Garty M, Krause I, Jansen J, De Napoli IE, Schophuizen CM, Wilmer MJ, Mutsaers HA, Heuvel LP, Grijpma DW, Stamatialis D, Hoenderop JG, Masereeuw R, Van Craenenbroeck AH, Van Craenenbroeck EM, Van Ackeren K, Vrints CJ, Hoymans VY, Couttenye MM, Erkmen Uyar M, Tutal E, Bal Z, Guliyev O, Sezer S, Liu L, Wang C, Tanaka K, Kushiyama A, Sakai K, Hara S, Ubara Y, Ohashi Y, Kunugi Y, Kawazu S, Untersteller K, Seiler S, Rogacev KS, Emrich IE, Lennartz CS, Fliser D, Heine GH, Hoshino T, Ookawara S, Miyazawa H, Ueda Y, Ito K, Kaku Y, Hirai K, Mori H, Yoshida I, Kakuta S, Hayama N, Amemiya M, Okamoto H, Inoue S, Tabei K, Campos P, Dias C, Baptista J, Papoila AL, Ortiz A, Inchaustegui L, Soto K, Moon KH, Yang S, Lee DY, Kim HW, Kim B, Isnard Bagnis C, Guerraoui A, Zenasni F, Idier L, Chauveau P, Cerqueira A, Quelhas-Santos J, Pestana M, Choi JY, Jin DC, Choi YJ, Kim WY, Nam SA, Cha JH, Cernaro V, Loddo S, Lacquaniti A, Romeo A, Costantino G, Montalto G, Santoro D, Trimboli D, Ricciardi CA, Lacava V, Buemi M, Emrich IE, Zawada AM, Rogacev KS, Seiler S, Obeid R, Geisel J, Fliser D, Heine GH, Meneses GC, Silva Junior G, Costa MFB, Goncalves HS, Daher EF, Liborio AB, Martins AMC, Ekart R, Hojs N, Bevc S, Hojs R, Lim CS, Hwang JH, Chin HJ, Kim S, Kim DK, Kim S, Park JH, Shin SJ, Lee SH, Choi BS, Lemoine S, Panaye M, Juillard L, Dubourg L, Hadj-Aissa A, Guebre-Egziabher F, Silva Junior G, Vieira APF, Couto Bem AX, Alves MP, Meneses GC, Martins AMC, Liborio AB, Daher EF, Ito K, Ookawara S, Miyazawa H, Ueda Y, Kaku Y, Hirai K, Hoshino T, Mori H, Yoshida I, Tabei K, Stefan G, Capusa C, Stancu S, Margarit D, Petrescu L, Nedelcu ED, Mircescu G, Szarejko-Paradowska A, Rysz J, Hung CC, Chen HC, Ristovska V, Grcevska L, Podesta MA, Reggiani F, Cucchiari D, Badalamenti S, Buemi M, Ponticelli C, Graziani G, Nouri-Majalan N, Moghadasimousavi S, Eshaghyeh Z, Greenwood S, Koufaki P, Maclaughlin H, Rush R, Hendry BM, Macdougall IC, Mercer T, Cairns H. CKD LAB METHODS, PROGRESSION & RISK FACTORS 2. Nephrol Dial Transplant 2014. [DOI: 10.1093/ndt/gfu165] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
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Sciancalepore AG, Sallustio F, Girardo S, Passione LG, Camposeo A, Mele E, Di Lorenzo M, Costantino V, Schena FP, Pisignano D, Casino FG, Mostacci SD, Di Carlo M, Sabato A, Procida C, Creput C, Vanholder R, Stolear JC, Lefrancois G, Hanoy M, Nortier J, Potier J, Sereni L, Ferraresi M, Pereno A, Nazha M, Barbero S, Piccoli GB, Ficheux A, Gayrard N, Duranton F, Guzman C, Szwarc I, Bismuth -Mondolfo J, Brunet P, Servel MF, Argiles A, Bernardo A, Demers J, Hutchcraft A, Marbury TC, Minkus M, Muller M, Stallard R, Culleton B, Krieter DH, Korner T, Devine E, Ruth M, Jankowski J, Wanner C, Lemke HD, Surace A, Rovatti P, Steckiph D, Mancini E, Santoro A, Leypoldt JK, Agar BU, Bernardo A, Culleton BF, Vankova S, Havlin J, Klomp DJ, Van Beijnum F, Day JPR, Wieringa FP, Kooman JP, Gremmels H, Hazenbrink DH, Simonis F, Otten ML, Wester M, Boer WH, Joles JA, Gerritsen KG, Umimoto K, Shimamoto Y, Mastushima K, Miyata M, Muller M, Naik A, Pokropinski S, Bairstow S, Svatek J, Young S, Johnson R, Bernardo A, Rikker C, Juhasz E, Gaspar R, Rosivall L, Rusu E, Zilisteanu D, Balanica S, Achim C, Atasie T, Carstea F, Voiculescu M, Monzon Vazquez T, Saiz Garcia S, Mathani V, Escamilla Cabrera B, Cornelis T, Van Der Sande FM, Eloot S, Cardinaels E, Bekers O, Damoiseaux J, Leunissen KM, Kooman J, Baamonde Laborda E, Bosch Benitez-Parodi E, Perez Suarez G, Anton Perez G, Batista Garcia F, Lago Alonso M, Garcia Canton C, Hashimoto S, Seki M, Tomochika M, Yamamoto R, Okamoto N, Nishikawa A, Koike T, Ravagli E, Maldini L, Badiali F, Perazzini C, Lanciotti G, Steckiph D, Surace A, Rovatti P, Severi S, Rigotti A, McFarlane P, Marticorena R, Dacouris N, Pauly R, Nikitin S, Amdahl M, Bernardo A, Culleton B, Calabrese G, Mancuso D, Mazzotta A, Vagelli G, Balenzano C, Steckiph D, Bertucci A, Della Volpe M, Gonella M, Uchida T, Ando K, Kofuji M, Higuchi T, Momose N, Ito K, Ueda Y, Miyazawa H, Kaku Y, Nabata A, Hoshino T, Mori H, Yoshida I, Ookawara S, Tabei K, Umimoto K, Suyama M, Shimamoto Y, Miyata M, Kamada A, Sakai R, Minakawa A, Fukudome K, Hisanaga S, Ishihara T, Yamada K, Fukunaga S, Inagaki H, Tanaka C, Sato Y, Fujimoto S, Potier J, Bouet J, Queffeulou G, Bell R, Nolin L, Pichette V, Provencher H, Lamarche C, Nadeau-Fredette AC, Ouellet G, Leblanc M, Bezzaoucha S, Kouidmir Y, Kassis J, Alonso ML, Lafrance JP, Vallee M, Fils J, Mailley P, Cantaluppi V, Medica D, Quercia AD, Dellepiane S, Ferrario S, Gai M, Leonardi G, Guarena C, Caiazzo M, Biancone L, Enos M, Culleton B, Wiebenson D, Potier J, Hanoy M, Duquennoy S, Tingli W, Ling Z, Yunying S, Ping F, Dolley-Hitze T, Hamel D, Lombart ML, Leypoldt JK, Bernardo A, Hutchcraft AM, Vanholder R, Culleton BF, Movilli E, Camerini C, Gaggia P, Zubani R, Feller P, Pola A, Carli O, Salviani C, Manenti C, Cancarini G, Bozzoli L, Colombini E, Ricchiuti G, Pisanu G, Gargani L, Donadio C, Sidoti A, Lusini ML, Biagioli M, Ghezzi PM, Sereni L, Caiazzo M, Palladino G, Tomo T, Ishida K, Nakata T, Hamel D, Dolley-Hitze T. HAEMODIALYSIS TECHNIQUES AND ADEQUACY 1. Nephrol Dial Transplant 2014. [DOI: 10.1093/ndt/gfu153] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Kurnatowska I, Grzelak P, Masajtis-Zagajewska A, Kaczmarska M, Stefa czyk L, Vermeer C, Maresz K, Nowicki M, Patel L, Bernard LM, Elder GJ, Leonardis D, Mallamaci F, Tripepi G, D'Arrigo G, Postorino M, Enia G, Caridi G, Marino F, Parlongo G, Zoccali C, Genovese F, Boor P, Papasotiriou M, Leeming DJ, Karsdal MA, Floege J, Delmas-Frenette C, Troyanov S, Awadalla P, Devuyst O, Madore F, Jensen JM, Mose FH, Kulik AEO, Bech JN, Fenton RA, Pedersen EB, Lucisano S, Villari A, Benedetto F, Pettinato G, Cernaro V, Lupica R, Trimboli D, Costantino G, Santoro D, Buemi M, Carmone C, Robben JH, Hadchouel J, Rongen G, Deinum J, Navis GJ, Wetzels JF, Deen PM, Block G, Fishbane S, Shemesh S, Sharma A, Wolf M, Chertow G, Gracia M, Arroyo D, Betriu A, Valdivielso JM, Fernandez E, Cantaluppi V, Medica D, Quercia AD, Dellepiane S, Gai M, Leonardi G, Guarena C, Migliori M, Panichi V, Biancone L, Camussi G, Covic A, Ketteler M, Rastogi A, Spinowitz B, Sprague SM, Botha J, Rakov V, Floege J, Floege J, Ketteler M, Rastogi A, Spinowitz B, Sprague SM, Botha J, Braunhofer P, Covic A, Kaku Y, Ookawara S, Miyazawa H, Ito K, Ueda Y, Hirai K, Hoshino T, Mori H, Nabata A, Yoshida I, Tabei K, El-Shahawy M, Cotton J, Kaupke J, Wooldridge TD, Weiswasser M, Smith WT, Covic A, Ketteler M, Rastogi A, Spinowitz B, Sprague SM, Botha J, Braunhofer P, Floege J, Hanowski T, Jager K, Rong S, Lesch T, Knofel F, Kielstein H, McQuarrie EP, Mark PB, Freel EM, Taylor A, Jardine AG, Wang CL, Du Y, Nan L, :Hess K, Savvaidis A, Lysaja K, Dimkovic N, Floege J, Marx N, Schlieper G, Skrunes R, Larsen KK, Svarstad E, Tondel C, Singh B, Ash SR, Lavin PT, Yang A, Rasmussen HS, Block GA, Egbuna O, Zeig S, Pergola PE, Singh B, Braun A, Yu Y, Sohn W, Padhi D, Block G, Chertow G, Fishbane S, Rodriguez M, Chen M, Shemesh S, Sharma A, Wolf M, Delgado G, Kleber ME, Grammer TB, Kraemer BK, Maerz W, Scharnagl H, Ichii M, Ishimura E, Shima H, Ohno Y, Tsuda A, Nakatani S, Ochi A, Mori K, Inaba M, Filiopoulos V, Manolios N, Hadjiyannakos D, Arvanitis D, Karatzas I, Vlassopoulos D, Floege J, Botha J, Chong E, Sprague SM, Cosmai L, Porta C, Foramitti M, Masini C, Sabbatini R, Malberti F, Elewa U, Nastou D, Fernandez B, Egido J, Ortiz A, Hara S, Tanaka K, Kushiyama A, Sakai K, Sawa N, Hoshino J, Ubara Y, Takaichi K, Bouquegneau A, Vidal-Petiot E, Vrtovsnik F, Cavalier E, Krzesinski JM, Flamant M, Delanaye P, Kilis-Pstrusinska K, Prus-Wojtowicz E, Szepietowski JC, Raj DS, Amdur R, Yamamoto J, Mori M, Sugiyama N, Inaguma D, Youssef DM, Alshal AA, Elbehidy RM, Bolignano D, Palmer S, Navaneethan S, Strippoli G, Kim YN, Park K, Gwoo S, Shin HS, Jung YS, Rim H, Rhew HY, Tekce H, Kin Tekce B, Aktas G, Schiepe F, Draz Y, Rakov V, Yilmaz MI, Siriopol D, Saglam M, Kurt YG, Unal H, Eyileten T, Gok M, Cetinkaya H, Oguz Y, Sari S, Vural A, Mititiuc I, Covic A, Kanbay M, Filiopoulos V, Manolios N, Hadjiyannakos D, Arvanitis D, Karatzas I, Vlassopoulos D, Okarska-Napierala M, Ziolkowska H, Pietrzak R, Skrzypczyk P, Jankowska K, Werner B, Roszkowska-Blaim M, Cernaro V, Trifiro G, Lorenzano G, Lucisano S, Buemi M, Santoro D, Krause R, Fuhrmann I, Degenhardt S, Daul AE, Sallee M, Dou L, Cerini C, Poitevin S, Gondouin B, Jourde-Chiche N, Brunet P, Dignat-George F, Burtey S, Massimetti C, Achilli P, Madonna MPP, Muratore MTT, Fabbri GDD, Brescia F, Feriozzi S, Unal HU, Kurt YG, Gok M, Cetinkaya H, Karaman M, Eyileten T, Vural A, Oguz Y, Y lmaz MI, Sugahara M, Sugimoto I, Aoe M, Chikamori M, Honda T, Miura R, Tsuchiya A, Hamada K, Ishizawa K, Saito K, Sakurai Y, Mise N, Gama-Axelsson T, Quiroga B, Axelsson J, Lindholm B, Qureshi AR, Carrero JJ, Pechter U, Raag M, Ots-Rosenberg M, Vande Walle J, Greenbaum LA, Bedrosian CL, Ogawa M, Kincaid JF, Loirat C, Liborio A, Leite TT, Neves FMDO, Torres De Melo CB, Leitao RDA, Cunha L, Filho R, Sheerin N, Loirat C, Greenbaum L, Furman R, Cohen D, Delmas Y, Bedrosian CL, Legendre C, Koibuchi K, Aoki T, Miyagi M, Sakai K, Aikawa A, Pozna Ski P, Sojka M, Kusztal M, Klinger M, Fakhouri F, Bedrosian CL, Ogawa M, Kincaid JF, Loirat C, Heleniak Z, Aleksandrowicz E, Wierblewska E, Kunicka K, Bieniaszewski L, Zdrojewski Z, Rutkowski B. CKD PATHOPHYSIOLOGY AND CLINICAL STUDIES. Nephrol Dial Transplant 2014. [DOI: 10.1093/ndt/gfu148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Reis AR, Tabei K, Sakakibara Y. Oxidation mechanism and overall removal rates of endocrine disrupting chemicals by aquatic plants. J Hazard Mater 2014; 265:79-88. [PMID: 24333944 DOI: 10.1016/j.jhazmat.2013.11.042] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2013] [Revised: 11/16/2013] [Accepted: 11/18/2013] [Indexed: 05/12/2023]
Abstract
The purpose of this study was to evaluate experimentally and theoretically the oxidation mechanisms and overall removal rates of phenolic endocrine disrupting chemicals (EDCs) by aquatic plants. EDCs used in this study were bisphenol-A (BPA), 2,4-dichlorophenol (2,4-DCP), 4-tert-octylphenol (4-t-OP), and pentachlorophenol (PCP). Referring to reported detection levels in aquatic environments and contaminated sites, the feed concentration of each EDC was set from 1 to 100μg/L. Experimental results showed that, except for PCP, phenolic EDCs were stably and concurrently removed by different types of aquatic plants over 70 days in long-term continuous treatments. Primal enzymes responsible for oxidation of BPA, 2,4-DCP, and 4-t-OP were peroxidases (POs). Moreover, enzymatic removal rates of BPA, 2,4-DCP, and 4-t-OP by POs were more than 2 orders of magnitude larger than those by aquatic plants. Assuming that overall removal rates of EDCs are controlled by mass transfer rates onto liquid films on the surface of aquatic plants, an electrochemical method based on the limiting current theory was developed to measure the mass transfer rates of EDCs. Because of extremely large removal rates of EDCs by POs, observed removal rates by aquatic plants were in reasonably good agreement with calculated results by a mathematical model developed based on an assumption that mass transfer limitation is a rate-limiting step.
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Affiliation(s)
- A R Reis
- Department of Soil Science, Federal University of Lavras, Lavras, MG 37200-000, Brazil.
| | - K Tabei
- Department of Civil and Environmental Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555 Japan
| | - Y Sakakibara
- Department of Civil and Environmental Engineering, Waseda University, 3-4-1 Okubo, Shinjuku, Tokyo 169-8555 Japan.
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Fujii Y, T S, Koitabashi A, Hashimoto T, Hosaka K, Tabei K, Namatame T, Yoneda M, Hiraishi H, Terano A. Down-Regulation of TFF Expression by TNF-α in Gastric Epithelial Cells. Wound Repair Regen 2005. [DOI: 10.1111/j.1067-1927.2005.130116f.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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12
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Koitabashi A, Shimada T, Fujii Y, Hashimoto T, Hosaka K, Tabei K, Namatame T, Yoneda M, Hiraishi H, Terano A. Indometacin up-regulates TFF2 expression in gastric epithelial cells. Aliment Pharmacol Ther 2004; 20 Suppl 1:171-6. [PMID: 15298624 DOI: 10.1111/j.1365-2036.2004.01991.x] [Citation(s) in RCA: 5] [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] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
BACKGROUND Trefoil factor family peptides are expressed in gastrointestinal epithelial cells and play a critical role in maintaining mucosal integrity. Although non-steroidal anti-inflammatory drugs (NSAIDs) are important causative agents of gastric mucosal lesions, few data are available about the effect of NSAIDs on trefoil family peptides in gastric mucosa. AIM To examine whether indometacin, a widely used NSAID, affects trefoil factor family expression in gastric epithelial cells. METHODS MKN45, a cell line derived from human gastric cancer, was used. TFF1, TFF2, and TFF3 mRNA expression was assessed by real-time quantitative reverse transcription-polymerase chain reaction (RT-PCR). TFF2 gene transcription was also examined by luciferase reporter gene assay. RESULTS Relative expression level of TFF1, TFF2, TFF3 mRNA was 616: 12: 1 in unstimulated MKN45 cells. Although indometacin (1-250 micro mol/L) had no significant effect on the expression of TFF1 and TFF3 mRNA, it up-regulated TFF2 mRNA expression in a dose- and time-dependent manner. Luciferase reporter gene assay confirmed the up-regulation of TFF2 gene transcription by indometacin. Indometacin-induced up-regulation of TFF2 expression was not antagonized by externally applied prostaglandin E2. CONCLUSION These results suggest that indometacin up-regulates gastric epithelial cell TFF2 expression through a COX-independent mechanism. Since TFF peptides play an important role in gastric mucosal protection, indometacin-induced TFF2 may reduce the degree of gastric mucosal damage induced by indometacin.
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Affiliation(s)
- A Koitabashi
- Department of Gastroenterology and Institute for Medical Science, Dokkyo University School of Medicine, Mibu, Tochigi, Japan
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13
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Sobral RG, Ludovice AM, Gardete S, Tabei K, De Lencastre H, Tomasz A. Normally functioning murF is essential for the optimal expression of methicillin resistance in Staphylococcus aureus. Microb Drug Resist 2003; 9:231-41. [PMID: 12959401 DOI: 10.1089/107662903322286436] [Citation(s) in RCA: 38] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
A carboxy-terminal fragment of murF was used to construct and insert a suicide plasmid into the chromosomal copy of the gene in the highly and homogeneously methicillin-resistant Staphylococcus aureus (MRSA) strain COL by Campbell type integration. The plasmid insertion generated a mutant in which the MIC value for oxacillin was reduced from 400 microg/ml of the parental strain to 0.75 microg/ml in 90% of the cells of the mutant cultures that were heterogeneous: they contained subpopulations of bacteria with a frequency of 10(-3) that were capable of expressing resistance at nearly the parental level. The impact of the murF mutation on antibiotic resistance was selective for beta-lactam antibiotics: there was no change in the susceptibility of the mutant to D-cycloserine, fosfomycin, beta-D-chloro-alanine, moenomycin, bacitracin, or vancomycin. Analysis of the mutant peptidoglycan showed decrease in the percentage of oligomeric components in rough proportion to the accumulation of several abnormal muropeptide components, which were identified as structural variants of the disaccharide tripeptide monomer. An abnormal cell wall precursor identified as UDP MurNac tripeptide was also detected in the cytoplasmic pool of the mutant strain. A normal proportion of oligomers and a greatly reduced representation of the disaccharide tripeptide were demonstrated in the cell wall of the murF mutant's subpopulation that has retained the parental level of resistance. Northern analysis demonstrated a drastic reduction in the transcription rate of mecA in mutant F9 whereas mecA transcription increased in the subpopulation of bacteria that retained high-level resistance.
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Affiliation(s)
- R G Sobral
- Molecular Genetics Laboratory, Instituto de Tecnologia Química e Biológica da Universidade Nova de Lisboa, 2780 Oeiras, Portugal
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Kusano E, Inoue M, Akai Y, Furuya H, Ando Y, Tabei K, Asano Y. Effect of ticlopidine hydrochloride on erythropoietin-induced rise in blood pressure in patients on maintenance hemodialysis. Nephron Clin Pract 2002; 91:654-8. [PMID: 12138269 DOI: 10.1159/000065027] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [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: 11/19/2022] Open
Abstract
BACKGROUND/AIMS A recent observation that antiplatelet-aggregation drugs, including ticlopidine hydrochloride, may prevent erythropoietin (EPO)-induced rise in blood pressure in hemodialysis (HD) patients remains a subject of particular interest. The aim of the present study was to determine the effect of ticlopidine hydrochloride on EPO-induced rise in blood pressure of HD patients with special reference to blood levels of vasoactive substances. METHODS HD patients who showed hypertension or aggravation of preceding hypertension with EPO treatment were selected for this study. Ticlopidine hydrochloride was administered at a dose of 200 mg daily for 4 weeks. Blood pressure and serum levels of nitric oxide (NO), atrial natriuretic peptide (ANP) and endothelin (ET) were determined before and after drug administration. Patients were divided into two groups, one of which showed a drop in mean blood pressure (MBP) of >10 mm Hg (group I) and one which did not (group II), and a comparison was made between them with respect to the blood parameters. RESULTS Five of 15 patients showed a drop of MBP of >10 mm Hg (group I), and 10 patients did not show any change in MBP (group II). In group I, there was a significant increase in blood NO levels compared to the concentrations before ticlopidine administration, while there was no change in group II. With respect to ANP and ET, there was no significant change in either of the groups. CONCLUSION The findings suggest that the preventive effect of ticlopidine hydrochloride on EPO-induced rise in blood pressure may partly be related to the enhancement of NO production in patients on maintenance HD.
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Affiliation(s)
- E Kusano
- Division of Nephrology, Internal Medicine, Jichi Medical School, Minamikawachi, Tochigi, Japan.
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Nakai S, Iseki K, Tabei K, Kubo K, Masakane I, Fushimi K, Kikuchi K, Shinzato T, Sanaka T, Akiba T. Outcomes of hemodiafiltration based on Japanese dialysis patient registry. Am J Kidney Dis 2001; 38:S212-6. [PMID: 11576958 DOI: 10.1053/ajkd.2001.27449] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.3] [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: 11/11/2022]
Abstract
Effectiveness of various therapeutic modalities was analyzed among 1,196 patients entered in the registry of the Japanese Society for Dialysis Therapy who were on hemopurification therapy as of the end of 1998 and developed dialysis-related amyloidosis during 1999. In the investigation, the effectiveness of various hemopurification modalities on the dialysis-related amyloidosis was ranked as exacerbation, unchanged, or alleviation, so as to analyze the possible relationship between the hemopurification modality and its effectiveness. The analysis was performed using a logistic regression approach, and the results were shown as "the risk of a worse therapeutic ranking" among the hemopurification modalities. The smaller "the risk of a worse therapeutic effect" was, the more effective the treatment modality. When the risk of a worse therapeutic effect for the hemodialysis patients treated by a regular membrane was put at 1.0, the risk for hemodialysis patients using high-flux membrane was 0.489, the off-line hemodiafiltration risk was 0.117, the on-line hemodiafiltration risk was 0.013, and the risk of push/pull hemodiafiltration was 0.017. For hemodialysis with a beta(2)-microglobulin adsorption column, a low risk of 0.054 was found. The results indicated that hemodiafiltration therapy and simultaneous hemodialysis with beta(2)-microglobulin adsorption therapy were more effective treatment for dialysis-related amyloidosis.
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Affiliation(s)
- S Nakai
- Patient Registration Committee Headquarters of the Japanese Society for Dialysis Therapy, Tokyo, Japan.
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Abstract
A 59-year-old man who had received chronic hemodialysis developed left occipital pain and hypoglossal nerve palsy. He was diagnosed as having skull base metastasis from renal cell carcinoma related to acquired cystic kidney. Retrospective analysis revealed the patient had had elevated serum C-reactive protein and alkaline phosphatase levels before the symptoms appeared. Radiotherapy to the skull base relieved the pain. Finally he died with generalized metastases. Serum interleukin-6 levels measured during admission had been elevated, and interleukin-6 mRNA was detected in the autopsy specimen of renal cell carcinoma. Interleukin-6 might be involved in the etiology of paraneoplastic signs.
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Affiliation(s)
- K Endo
- Department of General Medicine, Omiya Medical Center, Jichi Medical School, Saitama
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Chen H, Tabei K, Siegel MM. Biopolymer sequencing using a triple quadrupole mass spectrometer in the ESI nozzle-skimmer/precursor ion MS/MS mode. J Am Soc Mass Spectrom 2001; 12:846-852. [PMID: 11444608 DOI: 10.1016/s1044-0305(01)00258-6] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A variety of model biopolymers, including oligonucleotides, oligosaccharides and a synthetic pharmaceutical agent, were sequenced using a triple quadrupole mass spectrometer equipped with an electrospray source and operated in a scan mode referred to as pseudo-MS3. This scan mode consists of three steps: (1) in-source collision-induced dissociation (CID) in the nozzle-skimmer (NS) region, (2) scanning of the fragment ions into the collision cell for further CID, and (3) passing of the secondary fragment ions through the final mass filter at a preselected mass, generally corresponding to the mass of a terminal sequence ion for the biopolymer. The mass spectra are recorded in the precursor ion MS/MS mode where ion selection and detection occur at the third stage of the triple quadrupole but the scan function is determined by the first stage. The advantages and limitations in using this pseudo-MS3 NS/precursor ion MS/MS scan mode for biopolymer sequencing are discussed.
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Affiliation(s)
- H Chen
- Wyeth-Ayerst Research, Lederle Laboratories, Pearl River, New York 10965, USA
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Aihara H, Kuroda Y, Sugawara Y, Tsuruya Y, Yamada S, Tabei K. [Tubulointerstitial nephritis in the case of acute renal failure from sepsis after a cat bite]. Nihon Jinzo Gakkai Shi 2001; 43:362-6. [PMID: 11431906] [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: 02/20/2023]
Abstract
Acute tubulointerstitial nephritis is associated with a variety of causes, such as drug interaction, and infectious or immunological mechanisms. We describe a patient who suffered from sepsis, septic shock, disseminated intravascular coagulation(DIC), hepatic failure and renal failure after receiving a bite from her house cat. The causes of her acute renal failure were initially thought to be due to circulatory failure with hypotensive shock, decrease in renal blood flow with fibrin formation by DIC, or microangiopathy such as hemolitic uremic syndrome. However, the renal biopsy on the 60th hospital day indicated tubulointerstitial nephritis, which was recognized by the presence of patchy and focal mononuclear small cell infiltration with invasion to the tubular epithelium. We concluded that prolonged renal failure was caused by tubulointerstitial nephritis. The cause of tubulointerstitial nephritis was not identified. Tubulointerstitial nephritis should be taken into consideration when the recovery from acute renal failure is slow.
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Affiliation(s)
- H Aihara
- Department of Integrated Medicine, Omiya Medical Center, Jichi Medical School, Saitama, Japan
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Moy FJ, Haraki K, Mobilio D, Walker G, Powers R, Tabei K, Tong H, Siegel MM. MS/NMR: a structure-based approach for discovering protein ligands and for drug design by coupling size exclusion chromatography, mass spectrometry, and nuclear magnetic resonance spectroscopy. Anal Chem 2001; 73:571-81. [PMID: 11217765 DOI: 10.1021/ac0006270] [Citation(s) in RCA: 57] [Impact Index Per Article: 2.5] [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: 11/29/2022]
Abstract
A protocol is described for rapidly screening small organic molecules for their ability to bind a target protein while obtaining structure-related information as part of a structure-based drug discovery and design program. The methodology takes advantage of and combines the inherent strengths of size exclusion gel chromatography, mass spectrometry, and NMR to identify bound complexes in a relatively universal high-throughput screening approach. Size exclusion gel chromatography in the spin column format provides the high-speed separation of a protein-ligand complex from free ligands. The spin column eluent is then analyzed under denaturing conditions by electrospray ionization mass spectrometry (MS) for the presence of small molecular weight compounds formerly bound to the protein. Hits identified by MS are then individually assayed by chemical shift perturbations in a 2D 1H-15N HSQC NMR spectrum to verify specific interactions of the compound with the protein and identification of the binding site on the protein. The utility of the MS/NMR assay is demonstrated with the use of the catalytic fragment of human fibroblast collagenase (MMP-1) as a target protein and the screening of a library consisting of approximately 32 000 compounds for the identification of molecules that exhibit specific binding to the RGS4 protein.
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Affiliation(s)
- F J Moy
- Department of Biological Chemistry, Wyeth Research, Cambridge, Massachusetts 02140, USA
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20
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Abstract
In healthy subjects, the blood volume (BV) increases rapidly after postural change from standing to the supine position. However, little is known about the effect of postural change on BV in long-term hemodialysis (HD) patients. Therefore, we have examined the BV change caused by adopting the supine position from standing by continuous hematocrit monitoring, using the CRIT-LINE instrument, in 8 anuric HD patients. The hematocrit was monitored for 25 min with the patient in the supine position just before HD. The percentage change in the BV (% Delta BV) was calculated from the hematocrit and approximated using the equation: % Delta BV = b - [1 - exp(-c x time (min)] -a x time (min). Coefficient a was the slope of the linear part in the % Delta BV, b was the magnitude of BV increase and c was the rate of BV increase. Then we examined the relationship between the coefficients (a, b and c) and clinical parameters. In all patients, % Delta BV increased quickly after adopting the supine position. The mean increases were 2.8 +/- 0.6% after 5 min and 4.8 +/- 0.5% after 25 min. There was a significant correlation between the value of % Delta BV calculated from the hematocrit and the value calculated using above equation (0.92 < r < 0.99, p < 0.001). Although coefficient a did not correlate with a clinical parameter, coefficient b showed a significant positive linear correlation with the serum albumin level (r = 0.816, p < 0.05) and coefficient c showed a significant positive linear correlation with the percentage change in interdialytic weight gain (r = 0.736, p < 0.05). Furthermore, based on the % Delta BV, we calculated the change in total BV, which had increased by 181.5 +/- 21.9 ml after 25 min in the supine position. In conclusion, the change in the BV with time by continuous hematocrit monitoring using the CRIT-LINE instrument can be approximated by a modified monoexponential equation. BV increased quickly in HD patients after postural change from standing to the supine position.
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Affiliation(s)
- S Ookawara
- Department of Internal Medicine, Yamagata Prefectural Central Hospital, 428-8 Nishikawa-machi, Nishimurayama-gun, Yamagata-ken, 990-0702 Japan
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Yang Y, Janota K, Tabei K, Huang N, Siegel MM, Lin YI, Rasmussen BA, Shlaes DM. Mechanism of inhibition of the class A beta -lactamases PC1 and TEM-1 by tazobactam. Observation of reaction products by electrospray ionization mass spectrometry. J Biol Chem 2000; 275:26674-82. [PMID: 10837472 DOI: 10.1074/jbc.m002369200] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
The reactions of class A beta-lactamases PC1 and TEM-1 with tazobactam (TZB), a potent penicillanic sulfone inhibitor for class A beta-lactamases, were studied using electrospray ionization mass spectrometry (ESI/MS). Following inactivation of the beta-lactamases by TZB, new abundant high mass components were observed including three with molecular masses of 52, 70, and 88 Da greater than PC1 and TEM-1, respectively, and a component with a molecular mass of 300 Da greater than PC1. In addition, three TZB reaction products with molecular masses of 248, 264, and 280 Da were observed. High performance liquid chromatography (HPLC)/ESI/MS analysis of the TZB-PC1 adduct digested with Glu-C revealed three new components with masses 52, 70, and 88 Da greater than that of the peptide composed of amino acid residues 58-82 and one new component with a mass 70 Da greater than that of the peptide composed of amino acid residues 125-141. HPLC/ESI/MS/MS analysis of the two digested peptides whose masses increased by 70 Da indicated that Ser-70 and Ser-130 were the most likely TZB-modified amino acid residues. Based on these data, a mechanism for the inactivation of the class A beta-lactamases by TZB is proposed. In this scheme, initial acylation of Ser-70 by TZB and opening of the lactam ring are followed by one of several different events: (1) the rapid decomposition of TZB with loss of the enamine moiety to form the propiolylated enzyme, (2) an intramolecular nucleophilic displacement of the imine or enamine moiety by Ser-130 to form a cross-linked vinyl ether, and (3) hydrolysis of the imine or enamines to form a Ser-70-linked aldehyde.
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Affiliation(s)
- Y Yang
- Wyeth-Ayerst Research, Pearl River, New York 10965, USA.
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Siegel MM, Tabei K, Tsao R, Pastel MJ, Pandey RK, Berkenkamp S, Hillenkamp F, de Vries MS. Comparative mass spectrometric analyses of Photofrin oligomers by fast atom bombardment mass spectrometry, UV and IR matrix-assisted laser desorption/ionization mass spectrometry, electrospray ionization mass spectrometry and laser desorption/jet-cooling photoionization mass spectrometry. J Mass Spectrom 1999; 34:661-669. [PMID: 10394631 DOI: 10.1002/(sici)1096-9888(199906)34:6<661::aid-jms818>3.0.co;2-i] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Photofrin (porfimer sodium) is a porphyrin derivative used in the treatment of a variety of cancers by photodynamic therapy. This oligomer complex and a variety of porphyrin monomers, dimers and trimers were analyzed with five different mass spectral ionization techniques: fast atom bombardment, UV and IR matrix-assisted laser desorption/ionization, electrospray ionization, and laser desorption/jet-cooling photoionization. All five approaches resulted in very similar oligomer distributions with an average oligomer length of 2.7 +/- 0.1 porphyrin units. In addition to the Photofrin analysis, this study provides a side-by-side comparison of the spectra for the five different mass spectrometric techniques.
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Affiliation(s)
- M M Siegel
- Wyeth-Ayerst Research, Lederle Laboratories, Pearl River, New York 10965, USA.
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23
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24
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Ookawara S, Tabei K, Furuya H, Asano Y. The effect of EGF on electrolyte transport is mediated by tyrosine kinases in the rabbit cortical collecting duct. Miner Electrolyte Metab 1999; 25:191-8. [PMID: 10436405 DOI: 10.1159/000057444] [Citation(s) in RCA: 15] [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: 11/19/2022]
Abstract
Epidermal growth factor (EGF) inhibits amiloride-sensitive Na(+) conductance in the apical membrane of the isolated rabbit cortical collecting duct. However, there is no information on the relationship between electrolyte transport and tyrosine kinase. We examined the effect of EGF on transport of potassium and chloride as well as sodium and the roles of tyrosine kinases in the rabbit cortical collecting duct using in vitro isolated tubular microperfusion. Basolateral EGF depolarized the transepithelial voltage in a dose-dependent manner within a concentration range of 10(-10) in 10(-8) M. Basolateral ouabain and luminal amiloride completely abolished EGF-induced depolarization. However, luminal BaCl(2) did not abolish its depolarization. To confirm the mechanism, sodium, potassium, and chloride fluxes were measured in the presence of 10(-10) M EGF. EGF significantly decreased the lumen-to-bath isotope flux of sodium and chloride from 93.6+/-12.5 to 61.1+/-9.6 pmol/mm/min (n = 5, p<0.05) and from 86.6+/-10.0 to 54. 8+/-9.7 pmol/mm/min (n = 10, p<0.01), respectively. EGF also decreased net potassium secretion from -27.7+/-5.9 to -7.8+/-1.5 pmol/mm/min (n = 6, p<0.01). To examine whether EGF-induced depolarization is mediated by tyrosine kinase, tyrosine kinase inhibitors were applied from the basolateral side. Pretreatment with 1 microg/ml herbimycin A for 120 min completely abolished EGF-induced depolarization (90.9+/-5.4%, n = 4; NS). Herbimycin A itself also did not change the lumen-to-bath isotope flux of sodium and completely abolished the inhibition of Na(+) absorption on EGF action (control 65.4+/-6.8, herbimycin A 61.8+/-6.3, EGF with herbimycin A 60.0+/-4.4 pmol/min/mm, n = 5; NS). In conclusion, EGF depolarizes transepithelial voltage by inhibiting sodium transport primarily and potassium and chloride transport secondarily. These effects were blocked by nonspecific tyrosine kinase inhibitors.
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Affiliation(s)
- S Ookawara
- Division of Nephrology, Department of Internal Medicine, Jichi Medical School, Tochigi, Japan
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25
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Amemiya M, Tabei K, Kusano E, Asano Y, Alpern RJ. Incubation of OKP cells in low-K+ media increases NHE3 activity after early decrease in intracellular pH. Am J Physiol 1999; 276:C711-6. [PMID: 10069999 DOI: 10.1152/ajpcell.1999.276.3.c711] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Chronic hypokalemia increases the activity of proximal tubule apical membrane Na+/H+ antiporter NHE3. The present study examined the effect of the incubation of OKP cells (an opossum kidney, clone P cell line) in control medium (K+ concn ([K+]) = 5.4 mM) or low-K+ medium ([K+] = 2.7 mM) on NHE3. The activity of an ethylisopropyl amiloride-resistant Na+/H+ antiporter, whose characteristics were consistent with those of NHE3, was increased in low-K+ cells beginning at 8 h. NHE3 mRNA and NHE3 protein abundance were increased 2.2-fold and 62%, respectively, at 24 h but not at 8 h. After incubation in low-K+ medium, intracellular pH (pHi) decreased by 0.27 pH units (maximum at 27 min) and then recovered to the control level. Intracellular acidosis induced by 5 mM sodium propionate increased Na+/H+ antiporter activity at 8 and 24 h. Herbimycin A, a tyrosine kinase inhibitor, blocked low-K+- and sodium propionate-induced activation of the Na+/H+ antiporter at 8 and 24 h. Our results demonstrate that low-K+ medium causes an early decrease in pHi, which leads to an increase in NHE3 activity via a tyrosine kinase pathway.
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Affiliation(s)
- M Amemiya
- Division of Nephrology, Department of Internal Medicine, Jichi Medical School, Tochigi, Japan 329-0498, USA
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26
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Hileman RE, Siegel MM, Tabei K, Balagurunathan K, Linhardt RJ. Isolation and characterization of beta-cyclodextrin sulfates by preparative gradient polyacrylamide gel electrophoresis, capillary electrophoresis and electrospray ionization - mass spectrometry. Electrophoresis 1998; 19:2677-81. [PMID: 9848677 DOI: 10.1002/elps.1150191517] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
A beta-cyclodextrin sulfate mixture has been fractionated using discontinuous gradient polyacrylamide gel electrophoresis. Semidry electrotransfer of the sample onto a positively charged nylon membrane and visualization of a portion of this membrane with Alcian blue stain showed multiple bands. The bands were cut from the remaining portion of the membrane and after washing with 8 M urea, the beta-cyclodextrin sulfate fractions were eluted with 2 M sodium chloride and dialyzed. Analysis of each fraction using high resolution analytical gradient polyacrylamide gel electrophoresis as well as capillary electrophoresis, using indirect detection, showed some of the fractions to be pure while others were mixtures. Each beta-cyclodextrin sulfate fraction was complexed with a basic synthetic peptide and analyzed by electrospray ionization mass spectrometry to define the mass of the components in each mixture and thereby to determine the purity of each sample.
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Affiliation(s)
- R E Hileman
- Medicinal and Natural Products Chemistry, College of Pharmacy, University of Iowa, Iowa City 52242, USA
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27
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Siegel MM, Tabei K, Bebernitz GA, Baum EZ. Rapid methods for screening low molecular mass compounds non-covalently bound to proteins using size exclusion and mass spectrometry applied to inhibitors of human cytomegalovirus protease. J Mass Spectrom 1998; 33:264-273. [PMID: 9538525 DOI: 10.1002/(sici)1096-9888(199803)33:3<264::aid-jms629>3.0.co;2-2] [Citation(s) in RCA: 27] [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] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
General and rapid methods were developed for determining the extent of non-covalent binding between small molecules and proteins, using the model system of human cytomegalovirus protease and several drug candidates which inhibit the protease by non-covalently binding to it. The assay was performed by off-line coupling of size-exclusion methods with mass spectrometry in the following manner. The protease and inhibitor were incubated together under native conditions and then subjected to separation based on size, by use of a spin column (gel permeation chromatography) and/or a microconcentrator (ultrafiltration). The spin column selectively passed the high molecular mass (M(r)) protease and trapped low M(r) molecules. Alternatively, the microconcentrator passed low M(r) molecules and retained the protease. If the inhibitor bound non-covalently to the protease, both the inhibitor and protease passed through the spin column (or were retained by the microconcentrator). Electrospray ionization mass spectrometry was used to assay the spin column eluate (or the microconcentrator retentate) and to characterize the amounts of protease and inhibitor based on known standards. An advantage of these techniques is that a mixture containing inhibitors can be analyzed in the presence of the protease, and inhibitors with the greatest binding affinity can be identified. Non-covalent binding specificity was demonstrated using spin columns by comparing the binding affinity of inhibitors using several mutants of cytomegalovirus protease. The techniques described are applicable to the rapid screening of compound libraries for selecting substances which bind non-covalently to a known protein.
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Affiliation(s)
- M M Siegel
- Wyeth-Ayerst Research, Lederle Laboratories, Pearl River, New York 10965, USA.
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28
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Tian S, Kusano E, Ohara T, Tabei K, Itoh Y, Kawai T, Asano Y. Cystatin C measurement and its practical use in patients with various renal diseases. Clin Nephrol 1997; 48:104-8. [PMID: 9285147] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
OBJECTIVE To evaluate the clinical usefulness in terms of estimation for glomerular filtration rate (GFR), we determined the cystatin C levels in the serum and urine of 33 healthy volunteers as well as in the serum and urine of 35 patients with various renal diseases and compared them with those of creatinine. In addition, we evaluated this substance as an indicator of removal rate of low molecular weight protein with high flux membranes in 6 hemodialysis (HD) patients. METHODS Serum and urinary cystatin C levels were measured by using an enzyme-linked immunosorbent assay (ELISA) method, 24-hour creatinine clearance was used as an indicator of GFR. RESULTS Reference intervals with 95% ranges are 0.47-1.03 mg/l in the serum from healthy volunteers. There was a significant positive correlation between serum cystatin C and creatinine levels (r = 0.936, p < 0.001) in the patients with various renal diseases. Serum cystatin C and creatinine inversely and logarithmically correlated to creatinine clearance as shown in the following equations: log cystatin C = -0.564 x log creatinine clearance + 1.216 (r = -0.850), log creatinine = -0.678 x log creatinine clearance + 1.449 (r = -0.904). In these equations l/day is the unit used for creatinine clearance, mg/l is the unit used for serum cystatin C. The range for cystatin C is 0.67-6.15 mg/l, 0.66-7.23 mg/dl for creatinine and 8.9-186.3 l/day (6.2-129.4 ml/min) for creatinine clearance. Serum cystatin C levels started to increase over normal range when creatinine clearance fell below 135.9 l/day (94.4 ml/min), while serum creatinine remained within normal ranges. The daily urinary excretion of cystatin C was increased significantly in the group in which creatinine clearance was below 30 l/day (20.8 ml/min) compared to that in which creatinine clearance was higher than in 70 l/day (48.6 ml/min). Fractional clearance of cystatin C increased proportionally and markedly to the decrease of creatinine clearance. In a regular HD condition with high flux membrane, the cystatin C removal rate was 38.7 +/- 1.7%. CONCLUSIONS These data suggest that combined measurement of cystatin C in the serum and urine is useful to estimate GFR, especially to detect the mild reduction of GFR. Cystatin C measurement can also be used as an indicator of removal rate of low molecular weight protein with different types of high flux membranes in hemodialysis.
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Affiliation(s)
- S Tian
- Department of Nephrology, Jichi Medical School, Tochigi, Japan
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29
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Liu DF, Phillips E, Wizemann TM, Siegel MM, Tabei K, Cowell JL, Tuomanen E. Characterization of a recombinant fragment that contains a carbohydrate recognition domain of the filamentous hemagglutinin. Infect Immun 1997; 65:3465-8. [PMID: 9234814 PMCID: PMC175491 DOI: 10.1128/iai.65.8.3465-3468.1997] [Citation(s) in RCA: 15] [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: 02/04/2023] Open
Abstract
The filamentous hemagglutinin (FHA) of Bordetella pertussis plays an important role in establishing infection by attaching the bacteria to the ciliated respiratory epithelial cells. Expression of DNA encoding residues 1141 to 1279 of FHA in Escherichia coli yields a protein of 18,000 Da that exhibits some of the carbohydrate recognition properties of FHA (S. M. Prasad, Y. Yin, E. Rodzinski, E. I. Tuomanen, and H. R. Masure, Infect. Immun. 61:2780-2785, 1993). We have constructed an E. coli strain that expresses this protein, designated fragment A, in a soluble form at markedly elevated levels. Fragment A could be purified with high purity and yields and was immunogenic in mice. Both fragment A and anti-fragment A sera inhibited the binding of B. pertussis to asialo-GM2 and to rabbit ciliated cells. These observations demonstrate that this fragment of FHA contains a cellular binding domain capable of eliciting functional antibodies.
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Affiliation(s)
- D F Liu
- Wyeth Lederle Vaccines and Pediatrics, West Henrietta, New York 14586, USA. Dai
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30
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Siegel MM, Tabei K, Kunz A, Hollander IJ, Hamann RR, Bell DH, Berkenkamp S, Hillenkamp F. Calicheamicin derivatives conjugated to monoclonal antibodies: determination of loading values and distributions by infrared and UV matrix-assisted laser desorption/ionization mass spectrometry and electrospray ionization mass spectrometry. Anal Chem 1997; 69:2716-26. [PMID: 9230680 DOI: 10.1021/ac970035q] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.4] [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: 02/04/2023]
Abstract
Calicheamicin derivatives (MW approximately 1500) and monoclonal antibodies (MoAbs) conjugated to calicheamicin derivatives (MW approximately 150,000) were analyzed by UV-MALDI/MS, IR-MALDI/MS, and ESI/MS. These materials are potent anticancer agents. Calicheamicin derivatives and conjugates rapidly degrade upon UV irradiation but are relatively stable during IR irradiation and under ESI conditions. A unique feature of IR-MALDI/MS is a 2 times enhancement in resolution relative to UV-MALDI/MS for masses above approximately 50,000 Da resulting in a molecular ion envelope containing a series of partially resolved peaks of the calicheamicin-MoAb conjugates. The mass shift difference between the peak maxima corresponded to the mass change due to the covalent addition of calicheamicin derivatives to the monoclonal antibody. The distribution of the calicheamicin derivatives in the monoclonal antibodies was computed by deconvoluting the partially resolved peak envelope. A unique feature of the ESI mass spectra, under unit resolution conditions, is that the distribution of the carbohydrates can be well resolved for pure MoAbs and can be only partially resolved for conjugated MoAbs. Average loading values for calicheamicia derivatives when conjugated to MoAbs were computed from UV-MALDI/MS, IR-MALDI/MS, and ESI/MS data and the results compared with the average loading values obtained by UV absorption spectrometry. Very low average loading values were computed from UV-MALDI/MS data due to the degradation of the conjugated calicheamicin derivatives during the UV irradiation process. The IR-MALDI/MS average loading values, obtained with glycerol as the matrix, were consistent with the UV absorption spectrometry values for conjugates having hydrolytically stable linkers, but not when the linker contained a hydrolytically labile hydrazone. ESI/MS average loading values were generally lower than the corresponding values obtained by IR-MALDI/MS. The average loading values and distributions obtained using IR-MALDI/MS were more reliable than the corresponding ESI/MS values because the partially resolved, singly and doubly charged peaks in the IR-MALDI spectra can be mathematically deconvoluted, while the overlapping, highly multiply charged peaks of the electrospray spectra can only be partially deconvoluted.
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Affiliation(s)
- M M Siegel
- Wyeth-Ayerst Research, Lederle Laboratories, Peart River, New York 10965, USA
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Siegel MM, Tabei K, Kagan MZ, Vlahov IR, Hileman RE, Linhardt RJ. Polysulfated carbohydrates analyzed as ion-paired complexes with basic peptides and proteins using electrospray negative ionization mass spectrometry. J Mass Spectrom 1997; 32:760-772. [PMID: 9241857 DOI: 10.1002/(sici)1096-9888(199707)32:7<760::aid-jms529>3.0.co;2-r] [Citation(s) in RCA: 22] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Electrospray ionization mass spectrometry was used in the negative ion mode to analyze complexes of sucrose octasulfate, sucrose heptasulfate and sulfated alpha-, beta- and gamma-cyclodextrins with synthetically prepared basic peptides, the basic protein ubiquitin and polyamines. The spectra presented demonstrate that complexes with these basic molecules facilitate the analysis of these polysulfated oligosaccharides. Stable (1:1) complexes result from the ion pairing between the protonated basic arginine and lysine residues of the peptide and the anionic sulfate groups of the polysulfated oligosaccharides. Fragmentation of the polysulfated oligosaccharides resulting in the loss of SO3 could be suppressed by controlling the experimental conditions, such as the nozzle-skimmer voltage, used to obtain the spectra. In the absence of fragmentation, it was possible to obtain data on the purity of sucrose octasulfate and sucrose heptasulfate as well as the distribution of the sulfated cyclodextrins. The confounding presence of sodium counter-ions is also eliminated using this method. Complete chemical sulfation of oligosaccharides is difficult to achieve. Thus, data on sample purity are essential for the characterization of sulfated oligosaccharides used as pharmaceutical agents.
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Affiliation(s)
- M M Siegel
- Wyeth-Ayerst Research, Pearl River, New York 10965, USA
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32
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Tabei K, Asano Y. [Arrhythmia in uremia]. Ryoikibetsu Shokogun Shirizu 1997:137-40. [PMID: 9277879] [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] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- K Tabei
- Department of Nephrology, Jichi Medical School
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33
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Tabei K, Asano Y. [Pericarditis in uremia]. Ryoikibetsu Shokogun Shirizu 1997:45-8. [PMID: 9277857] [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] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- K Tabei
- Department of Nephrology, Jichi Medical School
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34
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Ookawara S, Tabei K, Asano Y. [Uremic cardiomyopathy]. Ryoikibetsu Shokogun Shirizu 1997:98-101. [PMID: 9277870] [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] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- S Ookawara
- Department of Nephrology, Jichi Medical School
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35
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Abstract
OBJECTIVE Nafamostat mesilate, a potent protease inhibitor, is widely used for the treatment of pancreatitis, disseminated intravascular coagulation and as an anticoagulant in haemodialysis. However, hyperkalaemia associated with nafamostat mesilate has been reported. It is thought to be due to decreased urinary potassium excretion, of the drug suppression of aldosterone secretion, and a direct inhibitory action on the apical Na+ conductance in collecting ducts. We have seen two cases of nafamostat mesilate associated-hyperkalaemia, which indicated that extrarenal potassium imbalance might play a role in inducing hyperkalaemia. METHODS To examine the effect of nafamostat mesilate on potassium transport in erythrocytes in vitro, 86RbCl uptake was measured in red blood cells from eight healthy volunteers. RESULTS Nafamostat mesilate and a metabolite, 6-amidino-2-naphthol, at concentrations of 10(-4) and 10(-3) M, respectively, significantly, suppressed potassium influx whilst another metabolite, p-guanidino-benzoic acid, had no effect. The inhibitory action of nafamostat mesilate was not affected by various inhibitors. CONCLUSION Nafamostat mesilate and its metabolite, 6-amidino-2-naphthol, suppressed potassium influx in erythrocytes by inhibition of a Na-K ATPase dependent pathway, which was not inhibited by amiloride, barium, nor by frusemide (furosemide).
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Affiliation(s)
- S Ookawara
- Department of Medicine, Jichi Medical School, Tochigi-ken, Japan
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36
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Baum EZ, Siegel MM, Bebernitz GA, Hulmes JD, Sridharan L, Sun L, Tabei K, Johnston SH, Wildey MJ, Nygaard J, Jones TR, Gluzman Y. Inhibition of human cytomegalovirus UL80 protease by specific intramolecular disulfide bond formation. Biochemistry 1996; 35:5838-46. [PMID: 8639545 DOI: 10.1021/bi952996+] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [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: 02/01/2023]
Abstract
A symmetrically substituted disulfide compound, CL13933, was identified as a potent inhibitor of human cytomegalovirus UL80 protease. Two types of inhibited protease were observed, depending on inhibitor concentration. At high concentrations, CL13933 formed a covalent adduct with the protease on Cys residues. At lower concentrations, this compound induced specific intramolecular disulfide formation between Cys84 and Cys87, and between Cys138 and Cys161. In contrast, Cys202 did not form disulfide bonds. Inhibition was reversed upon reduction of the protease. Each of the five cysteines of the UL80 protease was individually mutated to Ala. Each of the mutant proteases retained enzymatic activity, but mutants C138A and C161A were resistant to inhibition by CL13933, suggesting that disulfide bond formation between Cys138 and Cys161 is responsible for inhibition. This disulfide is apparently not induced by air oxidation. Examination of the CL13933 loading patterns of wild type and the five mutant proteases by mass spectrometry revealed that residues Cys87, Cys138, and Cys161 react with CL13933, and that the disulfide pair partner of each (Cys84, Cys161, and Cys138, respectively) is able to displace the compound via thiol-disulfide exchange. The possible significance of these reactive thiols in the protease is discussed.
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Affiliation(s)
- E Z Baum
- Molecular Biology Research Section, Wyeth-Ayerst Research, Lederle Laboratories, Pearl River, New York 10965, USA.
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37
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Baum EZ, Ding WD, Siegel MM, Hulmes J, Bebernitz GA, Sridharan L, Tabei K, Krishnamurthy G, Carofiglio T, Groves JT, Bloom JD, DiGrandi M, Bradley M, Ellestad G, Seddon AP, Gluzman Y. Flavins inhibit human cytomegalovirus UL80 protease via disulfide bond formation. Biochemistry 1996; 35:5847-55. [PMID: 8639546 DOI: 10.1021/bi9529972] [Citation(s) in RCA: 31] [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: 02/01/2023]
Abstract
Among the most potent inhibitors of human cytomegalovirus protease identified by random screening of a chemical library was 1,4-dihydro-7,8-dimethyl 6H-pyrimido[1,2-b]-1,2,4,5-tetrazin-6-one (1) (PTH2). The oxidized form (2), PT, which is present in solutions of PTH2, was shown to be the actual inhibitory species which irreversibly inactivates the protease; recycling of PTH2 by dissolved oxygen results in complete inhibition of the protease at substoichiometric amounts of compound. No evidence for a covalent adduct between the protease and the inhibitor was obtained, and protease activity was restored by incubation of the inactivated enzyme with the reducing agent bismercaptoethyl sulfone, suggesting that disulfide bond formation was responsible for the observed inhibition. The five cysteines of the protease are normally in the reduced state; analysis of tryptic peptides from inhibited protease indicated that disulfide bonds Cys84-Cys87 and Cys138-Cys161 were formed. Using site-directed mutagenesis, the disulfide pair induced between Cys138 and Cys161 disulfide is dependent upon interaction of PT with the protease and does not form spontaneously, unlike that of the Cys84-Cys87 pair which can form in the absence of inhibitor. The inhibitor's redox chemistry is analogous to that of flavin, and, in fact, flavin inhibits the protease by the same mechanism, causing formation of a disulfide bond between Cys138 and Cys161. That the cysteines are dispensable, but can regulate protease activity by formation of a unique disulfide pair, suggests a plausible mechanism for control of proteolysis during the viral life cycle.
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Affiliation(s)
- E Z Baum
- Wyeth-Ayerst Research, Lederle Laboratories, Pearl River, New York 10965, USA.
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Abstract
Hypotension is frequently encountered during hemodialysis (HD). One of the main factors of the HD-induced hypotension is acute reduction of circulating plasma volume by water removal, which is induced by the poor plasma refilling from the extravascular space into vessels. The determinants of plasma refilling, however, have not been clearly identified. Recently, we devised a mathematical model of water transport in HD patients, which can estimate the plasma-refilling coefficient (Kr) during HD. In the present study, we evaluated the factors determining plasma refilling by using this model. In 13 patients undergoing regular HD, the changes of Kr during HD were calculated from the model. Levels of ANP, cGMP, cAMP, endothelin, angiotensin II and vasopressin were measured before and after HD. Kr fell from 750.4 +/- 558.0 to 112.8 +/- 81.9 ml/mm Hg/h during HD. The rate of water removal during HD showed no significant correlation with the changes of Kr. Among the hormones and nucleotides measured here, plasma ANP level and cGMP were significantly correlated with Kr (r = 0.78, p < 001 and r = 0.62, p < 0.01, respectively). Our findings suggest that severe reduction in the level of serum ANP during HD, which is induced by water removal, plays some role in HD-induced hypotension through the attenuation of plasma refilling in HD patients.
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Affiliation(s)
- O Iimura
- Division of Nephrology, Jichi Medical School, Tochigi, Japan
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Abstract
During hemodialysis therapy, a large amount of water is removed from the patient's blood in a short time; however, blood pressure remains stable in most patients. As water is removed, the circulating serum proteins become more concentrated, resulting in a marked increase in the driving force which pulls water from the extravascular space into the blood vessels, by a process called plasma refilling. However, since a method for studying plasma refilling has not previously been proposed, it is not known what determines the plasma refilling capacity of hemodialysis patients. To evaluate the plasma refilling capacity of patients, we propose here a method for calculating an index of plasma refilling capacity, which we have called the plasma-refilling coefficient (Kr). In 14 patients receiving maintenance hemodialysis therapy, total serum protein was measured before hemodialysis, and hematocrits were measured hourly during hemodialysis. From the changes in the hematocrits, we estimated the changes in the circulating plasma volume and in the intracapillary oncotic pressure at each time point. The water removal rate was also measured hourly. From these values, we calculated Kr. An averaged volume of 2,692 +/- 219 ml of water was removed from each patient resulting in a decrease in the estimated circulating blood volume, while the hematocrit and the estimated intracapillary oncotic pressure increased gradually. Kr calculated after 1 h of hemodialysis varied widely between patients, 140.3-1,744.2 ml/mm Hg/h, and decreased gradually as water removal continued. The average Kr of 14 patients was 698.9 +/- 15.2 ml/mm Hg/h at the beginning of water removal, and it decreased to 405.3 +/- 75.4, 203.9 +/- 39.5, 130.2 +/- 20.5 and 93.9 +/- 14.3 each hour thereafter. The index of plasma refilling proposed in this paper is useful for examining capillary water permeability and the degree of plasma refilling in hemodialysis patients.
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Affiliation(s)
- K Tabei
- Department of Medicine, Jichi Medical School, Tochigi, Japan
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Sasaki N, Ando Y, Tabei K, Kusano E, Yoshida M, Asano Y. Two cases of severe Guillain-Barré syndrome refractory to double-filtration plasmapheresis but responsive to plasma exchange with fresh frozen plasma (FFP). J Clin Apher 1996; 11:165-7. [PMID: 8915822 DOI: 10.1002/jca.2920110303] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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41
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Tabei K, Asano Y. [Countermeasure for patients with cardiovascular diseases due to hemodialysis]. Nihon Naika Gakkai Zasshi 1995; 84:1678-84. [PMID: 8537724] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
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42
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Kuroda Y, Takeda K, Tabei K, Kuorki M, Yagimuma T, Ohara T, Asano Y. Role of [Ca2+]i in lethal oxidative injury in rat cultured inner medullary collecting duct cells. Pflugers Arch 1995; 430:697-704. [PMID: 7478921 DOI: 10.1007/bf00386164] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [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: 01/25/2023]
Abstract
Reactive oxygen metabolites have been implicated in the pathogenesis of toxic, ischaemic and immunologically mediated renal injury. An increase in the cytosolic free Ca2+ concentration ([Ca2+]i) has been proposed as a mechanism of oxidative stress-induced cell injury. We used a fluorescence spectrometer and a fluorescence probe to measure the [Ca2+]i and viability of rat primary cultured inner medullary collecting duct (IMCD) cells during oxidative stress induced by 5 mM tert-butyl hydroperoxide (TBHP). Initially, this oxidative stress evoked a small increase in [Ca2+]i which was followed by a slower sustained increase from the resting level of 170.8 +/- 38.8 nM to 1490.5 +/- 301.7 nM after 60 min, and this preceded the loss of plasma membrane integrity, measured by the propidium iodide fluorescence method. The elimination of extracellular Ca2+ from the culture medium prevented the TBHP-induced [Ca2+]i increase and improved cell viability. Restoration of extracellular Ca2+ resulted in an immediate and large increase in [Ca2+]i and extensive cell death. Verapamil, a Ca2+ channel blocker, inhibited the [Ca2+]i increase and afforded significant protection against cellular injury following exposure to TBHP-induced oxidative stress. Extracellular acidosis also prevented the increase in [Ca2+]i and cell death caused by this oxidative stress. These results are consistent with the hypothesis that oxidative stress-induced IMCD cellular injury may be the result of increased [Ca2+]i caused, in part, by activation of voltage-dependent Ca2+ channels.
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Affiliation(s)
- Y Kuroda
- Department of Internal Medicine, Omiya Medical Center, Jichi Medical School, Saitama, 330, Japan
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Tabei K, Muto S, Furuya H, Sakairi Y, Ando Y, Asano Y. Potassium secretion is inhibited by metabolic acidosis in rabbit cortical collecting ducts in vitro. Am J Physiol 1995; 268:F490-5. [PMID: 7900849 DOI: 10.1152/ajprenal.1995.268.3.f490] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
The role of metabolic acidosis in the regulation of transepithelial potassium transport was examined in rabbit cortical collecting ducts (CCD) using in vitro isolated tubular microperfusion and conventional microelectrode techniques. Basolateral metabolic acidosis, created by reduction of bicarbonate concentration from 25 to 5 meq/l, pH 7.40 to 6.80, depolarized the transepithelial voltage significantly (-6.5 +/- 1.0 to -2.7 +/- 1.3 mV). Basolateral acidosis also suppressed net potassium secretion (-14.3 +/- 2.1 to -9.0 +/- 1.7 pmol.min-1.mm-1). Electrophysiological study in CCD cells demonstrated that basolateral metabolic acidosis depolarized transepithelial voltage and apical and basolateral membrane voltage with an increase of transepithelial and fractional apical resistance. Basolateral acidosis did not affect the 22Na efflux nor 86Rb efflux. The inhibitory action of basolateral acidosis on net potassium secretion remained in the presence of luminal barium and in the absence of bicarbonate. Ouabain could not abolish the effect of basolateral acidosis on transepithelial voltage completely. These data lead us to conclude that basolateral acidosis affects multiple transport pathways, and it inhibits mainly apical barium-sensitive potassium transport. Additionally, it inhibits apical sodium conductance, barium-insensitive potassium transport, and stimulates a ouabain-insensitive electrogenic transport pathway to some degree.
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Affiliation(s)
- K Tabei
- Department of Medicine, Jichi Medical School, Tochigi, Japan
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Tabei K. [Kidney disorders caused by bacterial toxins]. Nihon Naika Gakkai Zasshi 1994; 83:1771-6. [PMID: 7814951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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45
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Tsuruoka S, Koseki C, Muto S, Tabei K, Imai M. Axial heterogeneity of potassium transport across hamster thick ascending limb of Henle's loop. Am J Physiol 1994; 267:F121-9. [PMID: 8048551 DOI: 10.1152/ajprenal.1994.267.1.f121] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Functional significance of morphological heterogeneities along the thick ascending limb of Henle's loop of hamsters was explored by the in vitro microperfusion technique with special reference to K+ transport. The transmission electron microscopic study confirmed that there are two types of cells, with smooth surface (S-cell) and rough surface (R-cell), respectively, and that the former is abundant in the medullary thick ascending limb (MTAL), whereas the latter is in the cortical portion (CTAL). The electrophysiological study revealed that in both segments there are two cell populations, one having high basolateral and low apical membrane K+ conductances (HBC) and the other having low basolateral and high apical K+ conductances (LBC). Random cell puncture revealed that the ratios of HBC/LBC were 24/7 (77%/23%) in the MTAL and 7/22 (24%/76%) in the CTAL, suggesting that HBC corresponds to S-cell, whereas LBC corresponds to R-cell. Net K+ transport was determined in two segments by measuring K+ concentration in the collected and perfused fluid by ultramicroflame photometry. In all six tubules of MTAL, net K+ flux had a direction to reabsorption with a mean of 4.87 +/- 0.46 pmol.min-1.mm-1. In marked contrast, in all six tubules of CTAL, we observed K+ secretion with a mean of -3.81 +/- 0.49 pmol.min-1.mm-1. The transmural voltage was positive in both segments and was significantly higher in the CTAL (7.8 +/- 0.5 mV) than in the MTAL (2.5 +/- 0.2 mV). From these observations, we conclude that the S-cell corresponding to the HBC cell reabsorbs K+, whereas the R-cell corresponding to the LBC cell secrets K+.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- S Tsuruoka
- Department of Pharmacology, Jichi Medical School, Tochigi, Japan
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Abstract
Interleukin-1 (IL-1) induces natriuresis and diuresis. In the present study, the effect of basolateral IL-1 on sodium and water transport was examined in the cortical collecting duct (CCD) perfused in vitro. IL-1, 10 pg/ml and 10 ng/ml, inhibited lumen-to-bath sodium flux (JNa, peq.min-1.mm tubule-1), depolarizing transepithelial voltage (Vt) in a time- and dose-dependent manner. The inhibitory effect of 10 ng/ml but not 10 pg/ml IL-1 on Vt and JNa was mitigated by 5 microM indomethacin (IND) in bath. Also, 10 ng/ml IL-1, which did not affect the basal hydraulic conductivity (Lp, x10(-7) cm.atm-1.s-1) by itself, inhibited the hydrosmotic effect of 20 pM basolateral arginine vasopressin, and 5 microM IND abolished this inhibitory effect of 10 ng/ml IL-1. The present study demonstrated direct inhibitory effect of basolateral IL-1 on sodium and water reabsorption in the rabbit CCD. The effect of IL-1 is suggested to be mediated, in part, by a cyclooxygenase metabolite(s).
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Affiliation(s)
- Y Sakairi
- Division of Nephrology, Jichi Medical School Hospital, Tochigi, Japan
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Furuya H, Tabei K, Asano Y. Enhanced volume-sensitive K flux in patients on chronic hemodialysis. Nephron Clin Pract 1994; 68:71-6. [PMID: 7991043 DOI: 10.1159/000188222] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023] Open
Abstract
Swelling-activated K flux was investigated in erythrocytes from patients on regular hemodialysis. K influx, measured by 86Rb uptake, was increased in hemodialysis patients from 25.5 +/- 0.6 to 47.3 +/- 3.4 nmol/10(9) cells/h (n = 4, p < 0.01), when the medium osmolarity of Hepes buffer was decreased by 100 mosm/kg H2O. In normal subjects, K influx was also stimulated from 28.1 +/- 1.2 to 37.8 +/- 2.1 nmol/10(9) cells/h (n = 4, p < 0.01). The swelling-activated increment of K influx was comparatively higher in hemodialysis patients (85.5 vs. 34.5% in controls). Reduction of the medium osmolarity by 100 mosm/kg H2O also caused a larger increase of K efflux in hemodialysis patients than in control subjects (171.1 vs. 118.1%). K efflux was increased even in the presence of 10(-4) M ouabain (from 284 +/- 25 to 879 +/- 122 nmol/10(9) cells/h), although the increment of K efflux was completely abolished when Cl was replaced by gluconate (555 +/- 47 nmol/10(9) cells/h with Cl and 467 +/- 44 nmol/10(9) cells/h without Cl). These data suggest that in hemodialysis patients, swelling-activated K transport is enhanced via activation of the Cl-dependent ouabain-insensitive K transport pathway.
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Affiliation(s)
- H Furuya
- Department of Medicine, Jichi Medical School, Tochigi, Japan
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Masunaga Y, Tabei K, Takeda S, Ando Y, Kusano E, Asano Y. Effect of the angiotensin converting enzyme inhibitor, captopril, on proteinuria in chronic glomerular disease. Nihon Jinzo Gakkai Shi 1993; 35:961-6. [PMID: 8255007] [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: 01/29/2023]
Abstract
The antiproteinuric effect of the angiotensin-I-converting enzyme inhibitor, captopril, was studied in 14 patients (10 men and 4 women, age range of 24 to 60 years) with chronic glomerulonephritis in whom IgA nephritis had been confirmed by renal biopsy. Eight of the 14 patients had received antihypertensive drugs such as calcium channel blockers, diuretics or beta-blockers. Captopril was added to these regimens at 25 mg twice daily in 3 patients, and 37.5 mg in 11 patients. Proteinuria decreased from 2.55 +/- 0.48 g/day to 1.58 +/- 0.35 g/day within three months after the start of administration. In 4 patients (28.6%), the extent of reduction was over 50%, and in 8 patients (57.1%), over 25%. Blood pressure, creatinine clearance and serum creatinine were not changed significantly. There was a positive linear correlation between the extent of reduction of proteinuria and the increase in plasma renin activity (r = 0.93, p < 0.001). We conclude that captopril reduces proteinuria in some patients with IgA nephritis whose plasma renin activity responds to the drug.
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Affiliation(s)
- Y Masunaga
- Department of Medicine, Jichi Medical School, Tochigi, Japan
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Sakurai T, Homma S, Tabei K, Asano Y. [Hemofiltration for the treatment of patients with congestive heart failure]. Nihon Rinsho 1993; 51:1310-6. [PMID: 8331799] [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: 01/29/2023]
Abstract
Hemofiltration is usually performed to patients with renal failure but is also an effective method for treating patients with congestive heart failure due to various causes such as hypotension, low cardiac output, oliguria and anasarca. By continuing 24hr a day at low blood flow rate, CAVH (Continuous Arteriovenous Hemofiltration) or CVVH (Continuous Venousvenous Hemofiltration) can remove the body fluid up to 500 ml/hr without much affecting systemic circulation. Successive management of body fluid even results in the recover of renal insufficiency due to decreased renal blood flow or drug overload. To perform hemofiltration safely, it is important to monitor the systemic circulation. Usually we monitor the diameter of IVC (Inferior vena cava) with ultrasonography thought the procedure the to detect changes in blood volume simultaneously.
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Affiliation(s)
- T Sakurai
- Department of Nephrology, Jichi Medical School
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50
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Abstract
In order to determine the appropriate dosage of carteolol in renal dysfunction, the pharmacokinetics of carteolol has been examined in appropriate patients. The plasma concentrations and urinary excretion of carteolol were investigated in 15 patients with varying degrees of renal impairment during the administration of 5-20 mg carteolol hydrochloride (5 mg/tablet) for 2-45 months. Plasma carteolol levels were linearly correlated with the serum creatinine concentration (r = 0.87) and reciprocally with the creatinine clearance (r = 0.82). The urinary carteolol concentration was correlated with the urinary creatinine concentration (r = 0.69) and the urinary carteolol excretion was also correlated with the creatinine clearance (r = 0.79). These relationships become even closer when the plasma carteolol concentrations and urinary excretion rate of carteolol were factored by the administered tablets. The fractional renal excretion of carteolol was virtually constant at various degrees of renal function, and it always exceeded 100%, which indicates that carteolol was actively secreted, even in patients with renal failure. The estimated tubular secretion rate of carteolol was logarithmically correlated with the fractional renal excretion of carteolol (r = 0.93). The results indicate that the dose of carteolol should be determined according to the degree of renal impairment.
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Affiliation(s)
- M Amemiya
- Department of Medicine, Jichi Medical School, Tochigi, Japan
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