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Tsujita M, Kosugi T, Masuda T, Okada M, Futamura K, Hiramitsu T, Goto N, Shunji N, Watarai Y, Maruyama S. Serum αKlotho as a Predictor of Graft Dysfunction After Kidney Transplantation. Transplant Proc 2018; 50:3440-3444. [DOI: 10.1016/j.transproceed.2018.09.008] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2018] [Accepted: 09/05/2018] [Indexed: 12/29/2022]
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Yamamoto T, Watarai Y, Futamura K, Okada M, Tsujita M, Hiramitsu T, Goto N, Narumi S, Takeda A, Kobayashi T. Efficacy of Eculizumab Therapy for Atypical Hemolytic Uremic Syndrome Recurrence and Antibody-Mediated Rejection Progress After Renal Transplantation With Preformed Donor-Specific Antibodies: Case Report. Transplant Proc 2017; 49:159-162. [PMID: 28104125 DOI: 10.1016/j.transproceed.2016.10.013] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
Atypical hemolytic uremic syndrome (aHUS) develops as the result of unregulated complement progression and precipitates de novo thrombotic microangiopathy. Plasma therapy is used to control the progression of the complement cascade, but that therapy is not effective in all patients and is accompanied by risk of infection and/or allergy. Eculizumab has been reported as an efficient therapy for aHUS. We report the case of a 35-year old woman who underwent effective eculizumab therapy for aHUS recurrence and antibody-mediated rejection (AMR) progress after renal transplantation with preformed donor-specific antibodies (DSA). She developed end-stage renal disease due to suspicious IgA nephropathy at age 33 years. Kidney transplantation was performed at age 35 years, and aHUS recurred 2 weeks later, leading to the progressive hemolytic anemia and renal dysfunction. Therefore, she underwent plasma therapy several times. Because it was difficult to continue to plasma therapy for severe allergy, eculizumab was proposed as an alternate therapy. Treatment with eculizumab was initiated 36 days after renal transplantation. After 3 years of eculizumab treatment, and without plasma therapy, schistocytes decreased, haptoglobin increased to within normal limits, creatinine levels stabilized, and no further episodes of diarrhea were reported. At protocol biopsy 1 year after transplantation, she was diagnosed with C4d-negative subclinical AMR. However, her pathologic findings at follow-up biopsy 3 years after transplantation were recovered. We conclude that eculizumab alone, without plasma therapy, is sufficient to treat recurrence of aHUS and AMR due to DSA after renal transplantation and to maintain long-term graft function.
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Affiliation(s)
- T Yamamoto
- Department of Transplant Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Japan.
| | - Y Watarai
- Department of Transplant Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Japan
| | - K Futamura
- Department of Transplant Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Japan
| | - M Okada
- Department of Transplant Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Japan
| | - M Tsujita
- Department of Transplant Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Japan
| | - T Hiramitsu
- Department of Transplant Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Japan
| | - N Goto
- Department of Transplant Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Japan
| | - S Narumi
- Department of Transplant Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Japan
| | - A Takeda
- Department of Nephrology, Nagoya Daini Red Cross Hospital, Nagoya, Japan
| | - T Kobayashi
- Department of Kidney Transplant Surgery, Aichi Medical University, Nagakute, Japan
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Ikeda T, Takahashi T, Tsujita M, Kanazawa M, Toriyabe M, Koyama M, Itoh K, Nakada T, Nishizawa M, Shimohata T. Effects of Alda-1, an Aldehyde Dehydrogenase-2 Agonist, on Hypoglycemic Neuronal Death. PLoS One 2015; 10:e0128844. [PMID: 26083658 PMCID: PMC4471358 DOI: 10.1371/journal.pone.0128844] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2015] [Accepted: 04/30/2015] [Indexed: 11/23/2022] Open
Abstract
Hypoglycemic encephalopathy (HE) is caused by a lack of glucose availability to neuronal cells, and no neuroprotective drugs have been developed as yet. Studies on the pathogenesis of HE and the development of new neuroprotective drugs have been conducted using animal models such as the hypoglycemic coma model and non-coma hypoglycemia model. However, both models have inherent problems, and establishment of animal models that mimic clinical situations is desirable. In this study, we first developed a short-term hypoglycemic coma model in which rats could be maintained in an isoelectric electroencephalogram (EEG) state for 2 min and subsequent hyperglycemia without requiring anti-seizure drugs and an artificial ventilation. This condition caused the production of 4-hydroxy-2-nonenal (4-HNE), a cytotoxic aldehyde, in neurons of the hippocampus and cerebral cortex, and a marked increase in neuronal death as evaluated by Fluoro-Jade B (FJB) staining. We also investigated whether N-(1,3-benzodioxole-5-ylmethyl)-2,6-dichlorobenzamide (Alda-1), a small-molecule agonist of aldehyde dehydrogenase-2, could attenuate 4-HNE levels and reduce hypoglycemic neuronal death. After confirming that EEG recordings remained isoelectric for 2 min, Alda-1 (8.5 mg/kg) or vehicle (dimethyl sulfoxide; DMSO) was administered intravenously with glucose to maintain a blood glucose level of 250 to 270 mg/dL. Fewer 4-HNE and FJB-positive cells were observed in the cerebral cortex of Alda-1-treated rats than in DMSO-treated rats 24 h after glucose administration (P = 0.002 and P = 0.020). Thus, activation of the ALDH2 pathway could be a molecular target for HE treatment, and Alda-1 is a potentially neuroprotective agent that exerts a beneficial effect on neurons when intravenously administered simultaneously with glucose.
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Affiliation(s)
- Tetsuhiko Ikeda
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Tetsuya Takahashi
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Mika Tsujita
- Department of Center for Integrated Human Brain Science, Brain Research Institute, Niigata University, Niigata, Japan
| | - Masato Kanazawa
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Masafumi Toriyabe
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Misaki Koyama
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Kosuke Itoh
- Department of Center for Integrated Human Brain Science, Brain Research Institute, Niigata University, Niigata, Japan
| | - Tsutomu Nakada
- Department of Center for Integrated Human Brain Science, Brain Research Institute, Niigata University, Niigata, Japan
| | - Masatoyo Nishizawa
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan
| | - Takayoshi Shimohata
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan
- * E-mail:
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Nagata H, Yamada S, Tsujita M, Yamada J, Hosoe H, Goto N, Watarai Y. Investigation of exercise capacity after renal transplantation. Physiotherapy 2015. [DOI: 10.1016/j.physio.2015.03.1947] [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: 11/16/2022]
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Otsu Y, Marcaggi P, Feltz A, Isope P, Kollo M, Nusser Z, Mathieu B, Kano M, Tsujita M, Sakimura K, Dieudonné S. Activity-dependent gating of calcium spikes by A-type K+ channels controls climbing fiber signaling in Purkinje cell dendrites. Neuron 2014; 84:137-151. [PMID: 25220810 PMCID: PMC4183427 DOI: 10.1016/j.neuron.2014.08.035] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 08/17/2014] [Indexed: 12/01/2022]
Abstract
In cerebellar Purkinje cell dendrites, heterosynaptic calcium signaling induced by the proximal climbing fiber (CF) input controls plasticity at distal parallel fiber (PF) synapses. The substrate and regulation of this long-range dendritic calcium signaling are poorly understood. Using high-speed calcium imaging, we examine the role of active dendritic conductances. Under basal conditions, CF stimulation evokes T-type calcium signaling displaying sharp proximodistal decrement. Combined mGluR1 receptor activation and depolarization, two activity-dependent signals, unlock P/Q calcium spikes initiation and propagation, mediating efficient CF signaling at distal sites. These spikes are initiated in proximal smooth dendrites, independently from somatic sodium action potentials, and evoke high-frequency bursts of all-or-none fast-rising calcium transients in PF spines. Gradual calcium spike burst unlocking arises from increasing inactivation of mGluR1-modulated low-threshold A-type potassium channels located in distal dendrites. Evidence for graded activity-dependent CF calcium signaling at PF synapses refines current views on cerebellar supervised learning rules.
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Affiliation(s)
- Yo Otsu
- Inhibitory Transmission Team, IBENS, CNRS UMR UMR8197, INSERM U1024, Ecole Normale Supérieure, 75005 Paris, France
| | - Païkan Marcaggi
- Inhibitory Transmission Team, IBENS, CNRS UMR UMR8197, INSERM U1024, Ecole Normale Supérieure, 75005 Paris, France
| | - Anne Feltz
- Cerebellum Group, IBENS, CNRS UMR UMR8197, INSERM U1024, Ecole Normale Supérieure, 75005 Paris, France
| | - Philippe Isope
- Institut des Neurosciences Cellulaires et Intégratives, CNRS UPR 3212, 67000-Strasbourg, France
| | - Mihaly Kollo
- Laboratory of Cellular Neurophysiology, Institute of Experimental Medicine of the Hungarian Academy of Sciences, 1083 Budapest, Hungary
| | - Zoltan Nusser
- Laboratory of Cellular Neurophysiology, Institute of Experimental Medicine of the Hungarian Academy of Sciences, 1083 Budapest, Hungary
| | - Benjamin Mathieu
- Imaging Facility, IBENS, CNRS UMR 8197, INSERM U1024, Ecole Normale Supérieure, 75005 Paris, France
| | - Masanobu Kano
- Department of Neurophysiology, Graduate School of Medicine, University of Tokyo, Tokyo 113-0033, Japan
| | - Mika Tsujita
- Center for Transdisciplinary Research, Niigata University, Niigata 950-2181, Japan
| | - Kenji Sakimura
- Department of Cellular Neurobiology, Brain Research Institute, Niigata University, Niigata 951-8585, Japan
| | - Stéphane Dieudonné
- Inhibitory Transmission Team, IBENS, CNRS UMR UMR8197, INSERM U1024, Ecole Normale Supérieure, 75005 Paris, France.
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Yamamoto T, Watarai Y, Goto N, Horikoshi Y, Yamada S, Yasui K, Tsujita M, Hiramitsu T, Narumi S, Katayama A, Uchida K, Kobayashi T. Encephalitis caused by human herpesvirus-6B in pancreas-after-kidney transplantation. Transpl Infect Dis 2014; 16:853-8. [PMID: 25040797 DOI: 10.1111/tid.12270] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Revised: 04/12/2014] [Accepted: 05/05/2014] [Indexed: 11/30/2022]
Abstract
Human herpesvirus-6 (HHV-6) is a common pathogen among children, classically presenting with fever and rash that resolves without specific therapy. HHV-6 can be reactivated in the immunosuppressed patient. After bone marrow and solid organ transplantation, HHV-6 has been linked to various clinical syndromes, including undifferentiated febrile illness, encephalitis, myelitis, hepatitis, pneumonitis, and bone marrow suppression. However, HHV-6 encephalitis after pancreatic transplant has rarely been reported. Early diagnosis and treatment of HHV-6 encephalitis may be important for affected patients. We report the case of a 53-year-old pancreas-after-kidney transplant recipient who initially presented with high fever and confusion 3 weeks after operation. We managed to save the patient's life and preserve the pancreas graft function. We also review previously reported cases of HHV-6B encephalitis in solid organ transplant recipients.
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Affiliation(s)
- T Yamamoto
- Department of Transplant Surgery, Nagoya Daini Red Cross Hospital, Nagoya, Japan; Department of Transplant Immunology, Nagoya University School of Medicine, Nagoya, Japan
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Yamamoto T, Haneda M, Watarai Y, Tsujita M, Hiramitsu T, Goto N, Narumi S, Uchida K, Kobayashi T. Peripheral Blood Gene Expression Analysis in Biopsy Proven Clinical and Subclinical Chronic Antibody Mediated Rejection After Renal Transplantation: Analysis of Treg, Breg and Anergy Related Biomarkers. Transplantation 2014. [DOI: 10.1097/00007890-201407151-03082] [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: 11/25/2022]
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Sato T, Inagaki A, Kakiya S, Yamamoto T, Tsujita M, Hiramitsu T, Goto N, Narumi S, Watarai Y. A Possible Anti-Obese Strategy for Kidney Transplant Recipients With Type 2 Diabetes After Successful Kidney Transplantation. Transplantation 2014. [DOI: 10.1097/00007890-201407151-01753] [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: 11/25/2022]
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Hiramitsu T, Yamamoto T, Tsujita M, Goto N, Narumi S, Watarai Y. Can Abdominal Surgical History Be Preventing Factors of the Hand Assisted Laparoscopic Left Nephrectomy for Living Donor Kidney Transplantation? Transplantation 2014. [DOI: 10.1097/00007890-201407151-02044] [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: 11/25/2022]
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Yamamoto T, Watarai Y, Kobayashi T, Takeda A, Tsujita M, Takahisa H, Goto N, Narumi S, Morozumi K, Uchida K. Early Diagnosis and Treatment for Biopsy-Proven Subclinical Chronic Antibody Mediated Rejection After Renal Transplantation. Transplantation 2014. [DOI: 10.1097/00007890-201407151-01462] [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: 11/25/2022]
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Schachtner T, Reinke P, Dorje C, Mjoen G, Midtvedt K, Strom EH, Oyen O, Jenssen T, Reisaeter AV, Smedbraaten YV, Sagedal S, Mjoen G, Fagerland MW, Hartmann A, Thiel S, Zulkarnaev A, Vatazin A, Vincenti F, Harel E, Kantor A, Thurison T, Hoyer-Hansen G, Craik C, Kute VB, Shah PS, Vanikar AV, Modi PR, Shah PR, Gumber MR, Patel HV, Engineer DP, Shah VR, Rizvi J, Trivedi HL, Malheiro J, Dias L, Martins LS, Fonseca I, Pedroso S, Almeida M, Castro-Henriques A, Cabrita A, Costa C, Ritta M, Sinesi F, Sidoti F, Mantovani S, Di Nauta A, Messina M, Cavallo R, Verflova A, Svobodova E, Slatinska J, Slavcev A, Pokorna E, Viklicky O, Yagan J, Chandraker A, Messina M, Diena D, Tognarelli G, Ranghino A, Bussolino S, Fop F, Segoloni GP, Biancone L, Leone F, Mauro MV, Gigliotti P, Lofaro D, Greco F, Perugini D, Papalia T, Perri A, Vizza D, Giraldi C, Bonofilgio R, Luis-Lima S, Marrero D, Gonzalez-Rinne A, Torres A, Salido E, Jimenez-Sosa A, Aldea-Perona A, Gonzalez-Posada JM, Perez-Tamajon L, Rodriguez-Hernandez A, Negrin-Mena N, Porrini E, Mjoen G, Pihlstrom H, Dahle DO, Holdaas H, Von Der Lippe N, Waldum B, Brekke F, Amro A, Reisaeter AV, Os I, Klin P, Sanabria H, Bridoux P, De Francesco J, Fortunato RM, Raffaele P, Kong J, Son SH, Kwon HY, Whang EJ, Choi WY, Yoon CS, Thanaraj V, Theakstone A, Stopper K, Ferraro A, Bhattacharjya S, Devonald M, Williams A, Mella A, Messina M, Gallo E, Fop F, Di Vico MC, Diena D, Pagani F, Gai M, Ranghino A, Segoloni GP, Biancone L, Cho HJ, Nho KW, Park SK, Kim SB, Yoshida K, Ishii D, Ohyama T, Kohguchi D, Takeuchi Y, Varga A, Sandor B, Kalmar-Nagy K, Toth A, Toth K, Szakaly P, Zulkarnaev A, Vatazin A, Kildushevsky A, Fedulkina V, Kantaria R, Staeck O, Halleck F, Rissling O, Naik M, Neumayer HH, Budde K, Khadzhynov D, Bhadauria D, Kaul A, Prasad N, Sharma RK, Sezer S, Bal Z, Erkmen Uyar M, Guliyev O, Erdemir B, Colak T, Ozdemir N, Haberal M, Caliskan Y, Yazici H, Artan AS, Oto OA, Aysuna N, Bozfakioglu S, Turkmen A, Yildiz A, Sever MS, Yagisawa T, Nukui A, Kimura T, Nannmoku K, Kurosawa A, Sakuma Y, Miki A, Damiano F, Ligabue G, De Biasi S, Granito M, Cossarizza A, Cappelli G, Martins LS, Fonseca I, Malheiro J, Henriques AC, Pedroso S, Almeida M, Dias L, Davide J, Cabrita A, Von During ME, Jenssen TG, Bollerslev J, Godang K, Asberg A, Hartmann A, Bachelet T, Martinez C, Bello A, Kejji S, Couzi L, Guidicelli G, Lepreux S, Visentin J, Congy-Jolivet N, Rostaing L, Taupin JL, Kamar N, Merville P, Sezer S, Bal Z, Erkmen Uyar M, Ozdemir H, Guliyev O, Yildirim S, Tutal E, Ozdemir N, Haberal M, Sezer S, Erkmen Uyar M, Bal Z, Guliyev O, Sayin B, Colak T, Ozdemir Acar N, Haberal M, Banasik M, Boratynska M, Koscielska-Kasprzak K, Kaminska D, Bartoszek D, Mazanowska O, Krajewska M, Zmonarski S, Chudoba P, Dawiskiba T, Protasiewicz M, Halon A, Sas A, Kaminska M, Klinger M, Stefanovic N, Cvetkovic T, Velickovic - Radovanovic R, Jevtovic - Stoimenov T, Vlahovic P, Rungta R, Das P, Ray DS, Gupta S, Kolonko A, Szotowska M, Kuczera P, Chudek J, Wiecek A, Sikora-Grabka E, Adamczak M, Szotowska M, Kuczera P, Madej P, Wiecek A, Amanova A, Kendi Celebi Z, Bakar F, Caglayan MG, Keven K, Massimetti C, Imperato G, Zampi G, De Vincenzi A, Fabbri GDD, Brescia F, Feriozzi S, Filipov JJ, Zlatkov BK, Dimitrov EP, Svinarov DA, Poesen R, De Vusser K, Evenepoel P, Kuypers D, Naesens M, Meijers B, Kocak H, Yilmaz VT, Yilmaz F, Uslu HB, Aliosmanoglu I, Ermis H, Dinckan A, Cetinkaya R, Ersoy FF, Suleymanlar G, Fonseca I, Oliveira JC, Santos J, Martins LS, Almeida M, Dias L, Pedroso S, Lobato L, Castro-Henriques A, Mendonca D, Watarai Y, Yamamoto T, Tsujita M, Hiramitsu T, Goto N, Narumi S, Kobayashi T, Dahle DO, Holdaas H, Reisaeter AV, Dorje C, Mjoen G, Line PD, Hartmann A, Housawi A, House A, Ng C, Denesyk K, Rehman F, Moist L, Musetti C, Battista M, Izzo C, Guglielmetti G, Airoldi A, Stratta P, Musetti C, Cena T, Quaglia M, Fenoglio R, Cagna D, Airoldi A, Amoroso A, Stratta P, Palmisano A, Degli Antoni AM, Vaglio A, Piotti G, Cremaschi E, Buzio C, Maggiore U, Lee MC, Hsu BG, Zalamea Jarrin F, Sanchez Sobrino B, Lafuente Covarrubias O, Karsten Alvarez S, Dominguez Apinaniz P, Llopez Carratala R, Portoles Perez J, Yildirim T, Yilmaz R, Turkmen E, Altindal M, Arici M, Altun B, Erdem Y, Dounousi E, Mitsis M, Naka K, Pappas H, Lakkas L, Harisis H, Pappas K, Koutlas V, Tzalavra I, Spanos G, Michalis L, Siamopoulos K, Iwabuchi T, Yagisawa T, Kimura T, Nanmoku K, Kurosawa A, Yasunaru S, Lee MC, Hsu BG, Yoshikawa M, Kitamura K, Fuji H, Fujisawa M, Nishi S, Carta P, Zanazzi M, Buti E, Larti A, Caroti L, Di Maria L, Minetti EE, Shi Y, Luo L, Cai B, Wang T, Zou Y, Wang L, Kim Y, Kim HS, Choi BS, Park CW, Yang CW, Kim YS, Chung BH, Baek CH, Kim M, Kim JS, Yang WS, Han DJ, Park SK, Mikolasevic I, Racki S, Lukenda V, Persic MP, Colic M, Devcic B, Orlic L, Sezer S, Gurlek Demirci B, Guliyev O, Colak T, Say N CB, Ozdemir Acar FN, Haberal M, Vali S, Ismal K, Sahay M, Civiletti F, Cantaluppi V, Medica D, Mazzeo AT, Assenzio B, Mastromauro I, Deambrosis I, Giaretta F, Fanelli V, Mascia L, Musetti C, Airoldi A, Quaglia M, Guglielmetti G, Battista M, Izzo C, Stratta P, Lakkas L, Naka K, Dounousi E, Koutlas V, Gkirdis I, Bechlioulis A, Evangelou D, Zarzoulas F, Kotsia A, Balafa O, Tzeltzes G, Nakas G, Pappas K, Kalaitzidis R, Katsouras C, Michalis L, Siamopoulos K, Tutal E, Erkmen Uyar M, Uyanik S, Bal Z, Guliyev O, Toprak SK, Ilhan O, Sezer S, Bal Z, Ekmen Uyar M, Guliyev O, Sayin B, Colak T, Sezer S, Haberal M, Hernandez Vargas H, Artamendi Larranaga M, Ramalle Gomara E, Gil Catalinas F, Bello Ovalle A, Pimentel Guzman G, Coloma Lopez A, Sierra Carpio M, Gil Paraiso A, Dall Anesse C, Beired Val I, Huarte Loza E, Choy BY, Kwan L, Mok M, Chan TM, Yamakawa T, Kobayashi A, Yamamoto I, Mafune A, Nakada Y, Tannno Y, Tsuboi N, Yamamoto H, Yokoyama K, Ohkido I, Yokoo T, Luque Y, Anglicheau D, Rabant M, Clement R, Kreis H, Sartorius A, Noel LH, Timsit MO, Legendre C, Rancic N, Vavic N, Dragojevic-Simic V, Katic J, Jacimovic N, Kovacevic A, Mikov M, Veldhuijzen NMH, Rookmaaker MB, Van Zuilen AD, Nquyen TQ, Boer WH, Mjoen G, Pihlstrom H, Dahle DO, Holdaas H, Sahtout W, Ghezaiel H, Azzebi A, Ben Abdelkrim S, Guedri Y, Mrabet S, Nouira S, Ferdaws S, Amor S, Belarbia A, Zellama D, Mokni M, Achour A, Viklicky O, Parikova A, Slatinska J, Hanzal V, Fronek J, Orandi BJ, James NT, Montgomery RA, Desai NM, Segev DL, Fontana F, Ballestri M, Magistroni R, Damiano F, Cappelli G. TRANSPLANTATION CLINICAL 1. Nephrol Dial Transplant 2014. [DOI: 10.1093/ndt/gfu160] [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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Van Londen M, Humalda JK, Aarts BM, Sanders JS, Bakker SJL, Navis GJ, De Borst MH, Pazik J, O Dak M, Lewandowski Z, Podgorska M, Sadowska A, Sitarek E, Malejczyk J, Durlik M, Drechsler C, Philstrom H, Meinitzer A, Pilz S, Tomaschitz A, Abedini S, Fellstrom B, Jardine A, Wanner C, Maerz W, Holdaas H, Halleck F, Staeck O, Neumayer HH, Budde K, Khadzhynov D, Rostaing L, Allal A, Congy N, Aarninck A, Del Bello A, Maggioni S, Debiols B, Sallusto F, Kamar N, Stolyarevich E, Artyukhina L, Kim I, Tomilina N, Zaidenov V, Kurenkova L, Keyzer CA, De Borst MH, Van Den Berg E, Jahnen-Dechent W, Navis G, Bakker SJL, Van Goor H, Pasch A, Aulagnon F, Avettand-Fenoel V, Scemla A, Lanternier F, Lortholary O, Anglicheau D, Legendre C, Zuber J, Furic-Cunko V, Basic-Jukic N, Coric M, Kastelan Z, Hudolin T, Kes P, Mikolasevic I, Racki S, Lukenda V, Orlic L, Dobrowolski LC, Verberne HJ, Ten Berge IJM, Bemelman FJ, Krediet CTP, Ferreira AC, Silva C, Remedio F, Pena A, Nolasco F, Heldal K, Lonning K, Leivestad T, Reisaeter AV, Hartmann A, Foss AE, Midtvedt K, Vlachopanos G, Kassimatis T, Zerva A, Kokkona A, Stavroulaki E, Agrafiotis A, Sanchez Sobrino B, Lafuente Covarrubias O, Karsten Alvarez S, Zalamea Jarrin F, Rubio Gonzalez E, Huerta Arroyo A, Portoles Perez J, Basic-Jukic N, Kes P, Baek CH, Kim M, Kim JS, Yang WS, Han DJ, Park SK, Zulkarnaev A, Vatazin A, Cabiddu G, Maxia S, Castellino S, Loi V, Guzzo G, Piccoli GB, Pani A, Bucsa C, Tacu D, Harza M, Sinescu I, Mircescu G, Stefan G, Alfieri CM, Laura F, Danilovic B, Cresseri D, Meneghini M, Riccardo F, Regalia A, Messa P, Panuccio V, Tripepi R, Parlongo G, Quattrone S, Leonardis D, Tripepi G, Zoccali C, Mallamaci F, Amer H, Geerdes PA, Fettes TT, Prieto M, Walker RC, Edwards BS, Cosio FG, Khrabrova M, Nabokov A, Groene HJ, Weithofer P, Kliem V, Smirnov A, Dobronravov V, Sezer S, Gurlek Demirci B, Tutal E, Guliyev O, Say N CB, Ozdemir Acar FN, Haberal M, Albugami MM, Hussein M, Alsaeed S, Almubarak A, Bel'eed-Akkari K, Go biewska JE, Tarasewicz A, D bska- lizie A, Rutkowski B, Albugami MM, Hussein M, Almubarak A, Alsaeed S, Bel'eed-Akkari K, Ailioaie O, Arzouk N, Tourret J, Mercadal L, Szumilak D, Ourahma S, Parra J, Billault C, Barrou B, Alfieri CM, Floreani R, Ulivieri FM, Meneghini M, Regalia A, Zanoni F, Croci D, Rastaldi MP, Messa PG, Keyzer CA, Riphagen IJ, Joosten MM, Navis G, Muller Kobold AC, Kema IP, Bakker SJL, De Borst MH, Santos Lascasas J, Malheiro J, Fonseca I, Martins L, Almeida M, Pedroso S, Dias L, Henriques A, Cabrita A, Vincenti F, Weir M, Von Visger J, Kopyt N, Mannon R, Deng H, Yue S, Wolf M, Halleck F, Khadzhynov, D, Schmidt D, Petereit F, Slowinski T, Neumayer HH, Budde K, Staeck O, Hernandez Vargas H, Artamendi Larranaga M, Gil Catalinas F, Ramalle Gomara E, Bello Ovalle A, Pimentel Guzman G, Coloma Lopez A, Dall Anesse C, Gil Paraiso A, Beired Val I, Sierra Carpio M, Huarte Loza E, Slubowska K, Szmidt J, Chmura A, Durlik M, Staeck O, Khadzhynov D, Schmidt D, Niemann M, Petereit F, Lachmann N, Neumayer HH, Budde K, Halleck F, Alotaibi T, Nampoory N, Gheith O, Halim M, Aboatteya H, Mansour H, Abdulkawey H, Said T, Nair P, WazNa-Jab O Ska E, Durlik M, Elias M, Caillard S, Morelon E, Rivalan J, Moal V, Frimat L, Mourad G, Rerolle JP, Legendre C, Mousson C, Delahousse M, Pouteil-Noble C, Dantal J, Cassuto E, Subra JF, Lang P, Thervet E, Roosweil D, Molnar MZ, Fornadi K, Ronai KZ, Novak M, Mucsi I, Scale TM, Robertson S, Kumwenda M, Jibani M, Griffin S, Williams AJ, Mikhail A, Jeong JC, Koo TY, Jeon HJ, Han M, Oh KH, Ahn C, Yang J, Bancu I, Canas L, Juega J, Malumbres S, Guermah I, Bonet J, Lauzurica R, Basso E, Messina M, Daidola G, Mella A, Lavacca A, Manzione AM, Rossetti M, Ranghino A, Ariaudo C, Segoloni GP, Biancone L, Whang E, Son SH, Kwon H, Kong JJ, Choi WY, Yoon CS, Ferreira AC, Silva C, Aires I, Ferreira A, Remedio F, Nolasco F, Ratkovic M, Basic Jukic N, Gledovic B, Radunovic D, Prelevic V, Stefan G, Garneata L, Bucsa C, Harza M, Sinescu I, Mircescu G, Tacu D, Aniort J, Kaysi S, Mulliez A, Heng AE, Su owicz J, Wojas-Pelc A, Ignacak E, Janda K, Krzanowski M, Miarka P, Su owicz W, Filipov JJ, Zlatkov BK, Dimitrov EP, Svinarov DA, Champion L, Renoux C, Randoux C, Du Halgouet C, Azeroual L, Glotz D, Vrtovsnik F, Daugas E, Musetti C, Battista M, Cena T, Izzo C, Airoldi A, Magnani C, Stratta P, Fiskvik I, Holte H, Bentdal O, Holdaas H, Erkmen Uyar M, Sezer S, Bal Z, Guliyev O, Colak T, Gurlek Demirci B, Ozdemir Acar N, Haberal M, Kara E, Ahbap E, Basturk T, Koc Y, Sakaci T, Sahutoglu T, Akgol C, Sevinc M, Unsal A, Seyahi N, Abdultawab K, Alotaibi T, Gheith O, Mansour H, Halim M, Nair P, Said T, Balaha M, Elsayed A, Awadeen W, Nampoory N, Hwang JC, Jiang MY, Lu YH, Weng SF, Madziarska K, Zmonarski SC, Augustyniak-Bartosik H, Magott-Procelewska M, Krajewska M, Mazanowska O, Banasik M, Penar J, Weyde W, Boraty Ska M, Klinger M, Swarnalatha G, Narendranath L, Shanta Rao G, Sawhney A, Subrahmanyam L, Kumar S, Jeon H, Hakim A, Patel U, Shrivastava S, Banerjee D, Kimura T, Yagisawa T, Nanmoku K, Kurosawa A, Sakuma Y, Miki A, Nukui A, Lee CH, Oh IH, Park JS, Watarai Y, Narumi S, Goto N, Hiramitsu T, Tsujita M, Yamamoto T, Kobayashi T, Muniz Pacios L, Molina M, Cabrera J, Gonzalez E, Garcia Santiago A, Aunon P, Santana S, Polanco N, Gutierrez E, Jimenez C, Andres A, Mohammed M, Hammam M, Housawi A, Goldsmith DJ, Cronin A, Frame S, Smalcelj R, Canoz MB, Yavuz DD, Altunoglu A, Yavuz R, Colak T, Haberal M, Tong A, Hanson CS, Chapman JR, Halleck F, Budde K, Papachristou C, Craig J, Zheng XY, Han S, Wang LM, Zhu YH, Zeng L, Zhou MS, Guliyev O, Erkmen Uyar M, Sezer S, Bal Z, Colak T, Gurlek Demirci B, Ozdemir Acar N, Haberal M, Ranghino A, Diena D, De Rosa FG, Faletti R, Barbui AM, Guarnaccia C, Corcione S, Messina M, Ariaudo C, Segoloni GP, Biancone L, Patel R, Murray PD, Moiseev A, Kalachik A, Harden PN, Norby G, Mjoen G, Holdaas H, Gilboe IM, Shi Y, Luo L, Cai B, Wang T, Tao Y, Wang L, Erkmen Uyar M, Sezer S, Bal Z, Guliyev O, Tutal E, Gurlek Demirci B, Ozdemir Acar N, Haberal M, Di Vico MC, Messina M, Mezza E, Giraudi R, Nappo A, Boaglio E, Ranghino A, Fop F, Segoloni GP, Biancone L, Carta P, Dattolo E, Buti E, Zanazzi M, Villari D, Di Maria L, Santoro G, Li Marzi V, Minetti EE, Nicita G, Carta P, Zanazzi M, Buti E, Antognoli G, Dervishi E, Vignali L, Caroti L, Di Maria L, Minetti EE, Dorje C, Kovacevic G, Hammarstrom C, Strom EH, Holdaas H, Midtvedt K, Reisaeter AV, Alfieri CM, Floreani R, Meneghini M, Regalia A, Zanoni F, Vettoretti S, Croci MD, Rastaldi MP, Messa P, Heldal K, Lonning K, Reisaeter AV, Bernklev T, Midtvedt K, Strakosha A, Pasko N, Nasto F, Cadri V, Dedei A, Thereska N. TRANSPLANTATION CLINICAL 2. Nephrol Dial Transplant 2014. [DOI: 10.1093/ndt/gfu180] [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: 11/14/2022] Open
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Diaz-Tocados JM, Herencia C, Martinez-Moreno JM, Montes De Oca A, Rodriguez-Ortiz ME, Gundlach K, Buchel J, Steppan S, Passlick-Deetjen J, Rodriguez M, Almaden Y, Munoz-Castaneda JR, Nakano C, Hamano T, Fujii N, Matusi I, Mikami S, Tomida K, Mori D, Kusunoki Y, Shimomura A, Obi Y, Hayashi T, Rakugi H, Isaka Y, Tsubakihara Y, Jorgensen HS, Winther S, Hauge EM, Rejnmark L, Botker HE, Bottcher M, Svensson M, Ivarsen P, Sagliker Y, Demirhan O, Yildiz I, Paylar N, Inandiklioglu N, Akbal E, Tunc E, Tartaglione L, Rotondi S, Pasquali M, Muci ML, Mandanici G, Leonangeli C, Sotir N, Sales S, Mazzaferro S, Gigante M, Cafiero C, Brunetti G, Simone S, Grano M, Colucci S, Ranieri E, Pertosa G, Gesualdo L, Evenepoel P, Goffin E, Meijers B, Kanaan N, Bammens B, Coche E, Claes K, Jadoul M, Louvet L, Metzinger L, Buchel J, Steppan S, Massy ZA, Prasad B, St.Onge JR, Tentori F, Zepel L, Comment L, Akiba T, Bommer J, Fukagawa M, Goodkin DA, Jacobson SH, Robinson BM, Port FK, Evenepoel P, Viaene L, Poesen R, Bammens B, Meijers B, Naesens M, Sprangers B, Kuypers D, Claes K, Tominaga Y, Hiramitsu T, Yamamoto T, Tsujita M, Makowka A, G Yda M, Rutkowska-Majewska E, Nowicki MP, Takeshima A, Ogata H, Yamamoto M, Ito H, Kinugasa E, Kadokura Y, Dimkovic N, Dellanna F, Spasovski G, Wanner C, Locatelli F, Troib A, Assadi MH, Landau D, Rabkin R, Segev Y, Ciceri P, Elli F, Cappelletti L, Tosi D, Savi F, Bulfamante G, Cozzolino M, Barreto FC, De Oliveira RB, Benchitrit J, Louvet L, Rezg R, Poirot S, Jorgetti V, Drueke TB, Riser BL, Massy ZA, Pasquali M, Tartaglione L, Rotondi S, Muci ML, Mandanici G, Leonangeli C, Massimetti C, Utzeri G, Biondi B, Mazzaferro S, Verkaik M, Eringa EC, Musters RJ, Pulskens WP, Vervloet MG, Ter Wee PM, Schiller A, Onofriescu M, Apetrii M, Schiller O, Bob F, Timar R, Mihaescu A, Florea L, Mititiuc I, Veisa G, Covic A, Krause R, Kaase H, Stange R, Hopfenmuller W, Chen TC, Holick MF, Kawasaki T, Ando R, Maeda Y, Arai Y, Sato H, Iimori S, Okado T, Rai T, Uchida S, Sasaki S, An WS, Jeong E, Son SH, Kim SE, Son YK, Baxmann AC, Menon VB, Moreira SR, Medina-Pestana J, Carvalho AB, Heilberg IP, Bergman A, Qureshi AR, Haarhaus MH, Lindholm B, Barany P, Heimburger O, Stenvinkel P, Anderstam B, Wilson RJ, Copley JB, Keith MS, Preston P, Santos RSS, Moyses RMA, Silva BC, Jorgetti V, Coelho FMS, Elias RM, Wanderley RA, Ferreira LQO, Sena TCM, Valerio TR, Gueiros JEB, Gueiros APS, Awata R, Goto S, Nakai K, Fujii H, Nishi S, Sagliker Y, Dingil M, Paylar N, Kapur S, Kim B, Lee DY, Yang S, Kim HW, Moon KH, Palmer S, Teixeira-Pinto A, Saglimbene V, Macaskill P, Craig J, Strippoli G, Marks A, Nguyen H, Fluck N, Prescott G, Robertson L, Black C. CKD BONE DISEASE. Nephrol Dial Transplant 2014. [DOI: 10.1093/ndt/gfu166] [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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Yamanaga S, Watarai Y, Takeda A, Yamamoto T, Hiramitsu T, Tsujita M, Goto N, Uchida K, Katayama A, Morozumi K, Kobayashi T. Acute Antibody-mediated Rejection Possibly Due to Anti–human Leukocyte Antigen DQB1 Antibodies after Renal Transplantation – Case Report. Transplant Proc 2014; 46:640-3. [DOI: 10.1016/j.transproceed.2013.11.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Accepted: 11/07/2013] [Indexed: 11/24/2022]
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Tsujita M, Ichikawa M. Visual attention is necessary for the motor-visual temporal recalibration. J Vis 2013. [DOI: 10.1167/13.9.555] [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: 11/24/2022] Open
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Goto N, Matsuda Y, Takada M, Yamamoto T, Tsujita M, Hiramitsu T, Nanmoku K, Watarai Y, Katayama A, Kobayashi T, Uchida K. Long-Term Outcome in Kidney Transplant Recipients with HTLV-1 Carriers. Transplantation 2012. [DOI: 10.1097/00007890-201211271-00670] [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: 11/25/2022]
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Suzuki Y, Nakamura Y, Yamada K, Huber VJ, Tsujita M, Nakada T. Aquaporin-4 positron emission tomography imaging of the human brain: first report. J Neuroimaging 2012; 23:219-23. [PMID: 22817997 DOI: 10.1111/j.1552-6569.2012.00704.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
BACKGROUND AND PURPOSE Aquaporin 4 (AQP-4) is the most abundant aquaporin isoform in the brain. Alterations in its expression and distribution have been correlated with the progression of several clinical disorders; however, the specific roles of AQP-4 in those disorders are not well understood. Visualizing AQP-4 in vivo is expected to provide fresh insights into its roles in disease pathology, as well as aiding the clinical assessment of those disorders. METHODS We developed a 11C-labeled analogue of the AQP-4 ligand TGN-020 (2-nicotinamido-1,3,4-thiadiazole) suitable for in vivo positron emission tomography (PET) imaging. RESULTS In the present study, we report the first PET images of AQP-4 in the human brain. The results unequivocally demonstrated a specific distribution pattern for AQP-4 within the brain, namely, the subpial and perivascular endfeet of astrocytes. The choroid plexus, where both AQP-4 and AQP-1 are expressed, also showed substantial uptake of the ligand. CONCLUSIONS Based on these initial results, we believe [11C]TGN-020 PET will be valuable in determining the role of AQP-4 in disease progression, and for the clinical assessment of water homeostasis under various settings.
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Affiliation(s)
- Yuji Suzuki
- Center for Integrated Human Brain Science, Brain Research Institute, University of Niigata
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Nanmoku K, Matsuda Y, Yamamoto T, Tsujita M, Hiramitsu T, Goto N, Katayama A, Watarai Y, Kobayashi T, Uchida K. Clinical Characteristics and Outcomes of Renal Transplantation in Elderly Recipients. Transplant Proc 2012; 44:281-3. [DOI: 10.1016/j.transproceed.2012.01.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Nakamura Y, Suzuki Y, Tsujita M, Huber VJ, Yamada K, Nakada T. Development of a Novel Ligand, [C]TGN-020, for Aquaporin 4 Positron Emission Tomography Imaging. ACS Chem Neurosci 2011; 2:568-571. [PMID: 22022637 PMCID: PMC3198134 DOI: 10.1021/cn2000525] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2011] [Accepted: 06/27/2011] [Indexed: 12/02/2022] Open
Abstract
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Aquaporin 4 (AQP4), the most abundant isozyme of the water specific membrane transporter aquaporin family, has now been implicated to play a significant role in the pathogenesis of various disease processes of the nervous system from epilepsy to Alzheimer’s disease. Considering its clinical relevance, it is highly desirable to develop a noninvasive method for the quantitative analysis of AQP distribution in humans under clinical settings. Currently, the method of choice for such diagnostic examinations continues to be positron emission tomography (PET). Here, we report the successful development of a PET ligand for AQP4 imaging based on TGN-020, a potent AQP4 inhibitor developed previously in our laboratory. Utilizing [11C]-TGN-020, PET images were successfully generated in wild type and AQP4 null mice, providing a basis for future evaluation regarding its suitability for clinical studies.
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Affiliation(s)
- Yukihiro Nakamura
- Center for Integrated Human Brain Science, Brain Research Institute, University of Niigata, 1 Asahimachi, Niigata 951-8585, Japan
| | - Yuji Suzuki
- Center for Integrated Human Brain Science, Brain Research Institute, University of Niigata, 1 Asahimachi, Niigata 951-8585, Japan
| | - Mika Tsujita
- Center for Integrated Human Brain Science, Brain Research Institute, University of Niigata, 1 Asahimachi, Niigata 951-8585, Japan
| | - Vincent J. Huber
- Center for Integrated Human Brain Science, Brain Research Institute, University of Niigata, 1 Asahimachi, Niigata 951-8585, Japan
| | - Kenichi Yamada
- Center for Integrated Human Brain Science, Brain Research Institute, University of Niigata, 1 Asahimachi, Niigata 951-8585, Japan
| | - Tsutomu Nakada
- Center for Integrated Human Brain Science, Brain Research Institute, University of Niigata, 1 Asahimachi, Niigata 951-8585, Japan
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Watanabe Y, Takeuchi K, Higa Onaga S, Sato M, Tsujita M, Abe M, Natsume R, Li M, Furuichi T, Saeki M, Izumikawa T, Hasegawa A, Yokoyama M, Ikegawa S, Sakimura K, Amizuka N, Kitagawa H, Igarashi M. Chondroitin sulfate N-acetylgalactosaminyltransferase-1 is required for normal cartilage development. Biochem J 2010; 432:47-55. [PMID: 20812917 PMCID: PMC2995422 DOI: 10.1042/bj20100847] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2010] [Revised: 08/27/2010] [Accepted: 09/02/2010] [Indexed: 12/24/2022]
Abstract
CS (chondroitin sulfate) is a glycosaminoglycan species that is widely distributed in the extracellular matrix. To understand the physiological roles of enzymes involved in CS synthesis, we produced CSGalNAcT1 (CS N-acetylgalactosaminyltransferase 1)-null mice. CS production was reduced by approximately half in CSGalNAcT1-null mice, and the amount of short-chain CS was also reduced. Moreover, the cartilage of the null mice was significantly smaller than that of wild-type mice. Additionally, type-II collagen fibres in developing cartilage were abnormally aggregated and disarranged in the homozygous mutant mice. These results suggest that CSGalNAcT1 is required for normal CS production in developing cartilage.
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Key Words
- cartilage
- chondroitin sulfate
- collagen fibre
- n-acetylgalactosaminyltransferase (galnact)
- gene knockout
- glycosaminoglycan
- 2-ab, 2-aminobenzamide
- c4st-1, chondrotin 4-sulfotransferase-1
- chpf, chondroitin polymerization factor
- chsy, chondroitin synthase
- cs, chondroitin sulfate
- csgalnact, chondroitin sulfate n-acetylgalactosaminyltransferase
- cspg, chondroitin sulfate proteoglycan
- e, embryonic day
- es, embryonic stem
- fam20b, family member 20b
- g3pdh, glyceraldehyde-3-phosphate dehydrogenase
- gag, glycosaminoglycan
- glcua, glucuronic acid
- hrp, horseradish peroxidase
- pcna, proliferating cell nuclear antigen
- pg, proteoglycan
- rt, reverse transcription
- tem, transmission electron microscope
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Affiliation(s)
- Yumi Watanabe
- *Division of Molecular and Cellular Biology, Graduate School of Medical and Dental Sciences, Niigata University, 1–757 Asahi-machi, Chuo-ku, Niigata 951-8510, Japan
- †Trans-disciplinary Research Program, Niigata University, Niigata 951-8510, Japan
| | - Kosei Takeuchi
- *Division of Molecular and Cellular Biology, Graduate School of Medical and Dental Sciences, Niigata University, 1–757 Asahi-machi, Chuo-ku, Niigata 951-8510, Japan
- †Trans-disciplinary Research Program, Niigata University, Niigata 951-8510, Japan
| | - Susumu Higa Onaga
- *Division of Molecular and Cellular Biology, Graduate School of Medical and Dental Sciences, Niigata University, 1–757 Asahi-machi, Chuo-ku, Niigata 951-8510, Japan
| | - Michiko Sato
- *Division of Molecular and Cellular Biology, Graduate School of Medical and Dental Sciences, Niigata University, 1–757 Asahi-machi, Chuo-ku, Niigata 951-8510, Japan
| | - Mika Tsujita
- †Trans-disciplinary Research Program, Niigata University, Niigata 951-8510, Japan
| | - Manabu Abe
- ‡Department of Cellular Neurobiology, Niigata University, Niigata 951-8510, Japan
| | - Rie Natsume
- ‡Department of Cellular Neurobiology, Niigata University, Niigata 951-8510, Japan
| | - Minqi Li
- †Trans-disciplinary Research Program, Niigata University, Niigata 951-8510, Japan
- §Department of Developmental Biology of Hard Tissue, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan
| | - Tatsuya Furuichi
- ∥Laboratory for Bone and Joint Diseases, Center for Genome Medicine, RIKEN, 4-6-1 Shirokanedai Minato-ku, Tokyo 108-8639, Japan
| | - Mika Saeki
- ¶Department of Biochemistry, Kobe Pharmaceutical University, Higashinada-ku, Kobe 658-8558, Japan
| | - Tomomi Izumikawa
- ¶Department of Biochemistry, Kobe Pharmaceutical University, Higashinada-ku, Kobe 658-8558, Japan
| | - Ayumi Hasegawa
- **Department of Comparative and Experimental Medicine, Brain Research Institute, Niigata University, Niigata 951-8510, Japan
| | - Minesuke Yokoyama
- **Department of Comparative and Experimental Medicine, Brain Research Institute, Niigata University, Niigata 951-8510, Japan
| | - Shiro Ikegawa
- ∥Laboratory for Bone and Joint Diseases, Center for Genome Medicine, RIKEN, 4-6-1 Shirokanedai Minato-ku, Tokyo 108-8639, Japan
| | - Kenji Sakimura
- ‡Department of Cellular Neurobiology, Niigata University, Niigata 951-8510, Japan
| | - Norio Amizuka
- †Trans-disciplinary Research Program, Niigata University, Niigata 951-8510, Japan
- §Department of Developmental Biology of Hard Tissue, Division of Oral Health Science, Hokkaido University Graduate School of Dental Medicine, Kita 13, Nishi 7, Kita-ku, Sapporo 060-8586, Japan
| | - Hiroshi Kitagawa
- ¶Department of Biochemistry, Kobe Pharmaceutical University, Higashinada-ku, Kobe 658-8558, Japan
| | - Michihiro Igarashi
- *Division of Molecular and Cellular Biology, Graduate School of Medical and Dental Sciences, Niigata University, 1–757 Asahi-machi, Chuo-ku, Niigata 951-8510, Japan
- †Trans-disciplinary Research Program, Niigata University, Niigata 951-8510, Japan
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Igarashi H, Huber VJ, Tsujita M, Nakada T. Pretreatment with a novel aquaporin 4 inhibitor, TGN-020, significantly reduces ischemic cerebral edema. Neurol Sci 2010; 32:113-6. [PMID: 20924629 PMCID: PMC3026762 DOI: 10.1007/s10072-010-0431-1] [Citation(s) in RCA: 109] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2008] [Accepted: 09/16/2010] [Indexed: 11/05/2022]
Abstract
We investigated the in vivo effects of a novel aquaporin 4 (AQP4) inhibitor 2-(nicotinamide)-1,3,4-thiadiazole, TGN-020, in a mouse model of focal cerebral ischemia using 7.0-T magnetic resonance imaging (MRI). Pretreatment with TGN-020 significantly reduced brain edema associated with brain ischemia, as reflected by percentage of brain swelling volume (%BSV), 12.1 ± 6.3% in the treated group, compared to (20.8 ± 5.9%) in the control group (p < 0.05), and in the size of cortical infarction as reflected by the percentage of hemispheric lesion volume (%HLV), 20.0 ± 7.6% in the treated group, compared to 30.0 ± 9.1% in the control group (p < 0.05). The study indicated the potential pharmacological use of AQP4 inhibition in reducing brain edema associated with focal ischemia.
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Affiliation(s)
- Hironaka Igarashi
- Center for Integrated Human Brain Science, Brain Research Institute, University of Niigata, 1 Asahimachi, Chuoh-ku, Niigata, 951-8585, Japan
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Yamazaki M, Fukaya M, Hashimoto K, Yamasaki M, Tsujita M, Itakura M, Abe M, Natsume R, Takahashi M, Kano M, Sakimura K, Watanabe M. TARPs gamma-2 and gamma-7 are essential for AMPA receptor expression in the cerebellum. Eur J Neurosci 2010; 31:2204-20. [PMID: 20529126 DOI: 10.1111/j.1460-9568.2010.07254.x] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA)-type glutamate receptors require auxiliary subunits termed transmembrane AMPA receptor regulatory proteins (TARPs), which promote receptor trafficking to the cell surface and synapses and modulate channel pharmacology and gating. Of six TARPs, gamma-2 and gamma-7 are the two major TARPs expressed in the cerebellum. In the present study, we pursued their roles in synaptic expression of cerebellar AMPA receptors. In the cerebellar cortex, gamma-2 and gamma-7 were preferentially localized at various asymmetrical synapses. Using quantitative Western blot and immunofluorescence, we found severe reductions in GluA2 and GluA3 and mild reduction in GluA4 in gamma-2-knockout (KO) cerebellum, whereas GluA1 and GluA4 were moderately reduced in gamma-7-KO cerebellum. GluA2, GluA3 and GluA4 were further reduced in gamma-2/gamma-7 double-KO (DKO) cerebellum. The large losses of GluA2 and GluA3 in gamma-2-KO mice and further reductions in DKO mice were confirmed at all asymmetrical synapses examined with postembedding immunogold. Most notably, the GluA2 level in the postsynaptic density fraction, GluA2 labeling density at parallel fiber-Purkinje cell synapses, and AMPA receptor-mediated currents at climbing fiber-Purkinje cell synapses were all reduced to approximately 10% of the wild-type levels in DKO mice. On the other hand, the reduction in GluA4 in gamma-7-KO granular layer reflected its loss at mossy fiber-granule cell synapses, whereas that of GluA1 and GluA4 in gamma-7-KO molecular layer was caused, at least partly, by their loss in Bergmann glia. Therefore, gamma-2 and gamma-7 cooperatively promote synaptic expression of cerebellar AMPA receptors, and the latter also promotes glial expression.
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Affiliation(s)
- Maya Yamazaki
- Department of Cellular Neurobiology, Brain Research Institute, Niigata University, Niigata 951-8585, Japan
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Borelli P, Barros FEV, Nakajima K, Blatt SL, Beutler B, Pereira J, Tsujita M, Favero GM, Fock RA. Protein-energy malnutrition halts hemopoietic progenitor cells in the G0/G1 cell cycle stage, thereby altering cell production rates. Braz J Med Biol Res 2010; 42:523-30. [PMID: 19448901 DOI: 10.1590/s0100-879x2009000600008] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2008] [Accepted: 03/03/2009] [Indexed: 11/21/2022] Open
Abstract
Protein energy malnutrition (PEM) is a syndrome that often results in immunodeficiency coupled with pancytopenia. Hemopoietic tissue requires a high nutrient supply and the proliferation, differentiation and maturation of cells occur in a constant and balanced manner, sensitive to the demands of specific cell lineages and dependent on the stem cell population. In the present study, we evaluated the effect of PEM on some aspects of hemopoiesis, analyzing the cell cycle of bone marrow cells and the percentage of progenitor cells in the bone marrow. Two-month-old male Swiss mice (N = 7-9 per group) were submitted to PEM with a low-protein diet (4%) or were fed a control diet (20% protein) ad libitum. When the experimental group had lost about 20% of their original body weight after 14 days, we collected blood and bone marrow cells to determine the percentage of progenitor cells and the number of cells in each phase of the cell cycle. Animals of both groups were stimulated with 5-fluorouracil. Blood analysis, bone marrow cell composition and cell cycle evaluation was performed after 10 days. Malnourished animals presented anemia, reticulocytopenia and leukopenia. Their bone marrow was hypocellular and depleted of progenitor cells. Malnourished animals also presented more cells than normal in phases G0 and G1 of the cell cycle. Thus, we conclude that PEM leads to the depletion of progenitor hemopoietic populations and changes in cellular development. We suggest that these changes are some of the primary causes of pancytopenia in cases of PEM.
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Affiliation(s)
- P Borelli
- Departamento de Análises Clínicas e Toxicológicas, Faculdade de Ciências Farmacêuticas, Laboratório de Hematologia Experimental, Universidade de São Paulo, São Paulo, Brasil.
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Yanagawa K, Kawachi I, Toyoshima Y, Yokoseki A, Arakawa M, Hasegawa A, Ito T, Kojima N, Koike R, Tanaka K, Kosaka T, Tan CF, Kakita A, Okamoto K, Tsujita M, Sakimura K, Takahashi H, Nishizawa M. Pathologic and immunologic profiles of a limited form of neuromyelitis optica with myelitis. Neurology 2009; 73:1628-37. [PMID: 19917985 DOI: 10.1212/wnl.0b013e3181c1deb9] [Citation(s) in RCA: 79] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND Neuromyelitis optica (NMO) is a demyelinating syndrome characterized by myelitis and optic neuritis. Detection of anti-NMO immunoglobulin G antibody that binds to aquaporin-4 (AQP4) water channels allows the diagnosis of a limited form of NMO in the early stage with myelitis, but not optic neuritis. However, the detailed clinicopathologic features and long-term course of this limited form remain elusive. METHODS We investigated 8 patients with the limited form of NMO with myelitis in comparison with 9 patients with the definite form. RESULT All patients with limited and definite form showed uniform relapsing-remitting courses, with no secondary progressive courses. Pathologic findings of biopsy specimens from the limited form were identical to those of autopsy from the definite form, demonstrating extremely active demyelination of plaques, extensive loss of AQP4 immunoreactivity in plaques, and diffuse infiltration by macrophages containing myelin basic proteins with thickened hyalinized blood vessels. Moreover, the definite form at the nadir of relapses displayed significantly higher amounts of the inflammatory cytokines interleukin (IL)-1beta and IL-6 in CSF than the limited form and multiple sclerosis. CONCLUSION This consistency of pathologic findings and uniformity of courses indicates that aquaporin 4-specific autoantibodies as the initiator of the neuromyelitis optica (NMO) lesion consistently play an important common role in the pathogenicity through the entire course, consisting of both limited and definite forms, and NMO continuously displays homogeneity of pathogenic effector immune mechanisms through terminal stages, whereas multiple sclerosis should be recognized as the heterogeneous 2-stage disease that could switch from inflammatory to degenerative phase. This report is a significant description comparing the pathologic and immunologic data of limited NMO with those of definite NMO.
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Affiliation(s)
- K Yanagawa
- Department of Neurology, Brain Research Institute, Niigata University, Niigata, Japan
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Tani T, Sakimura K, Tsujita M, Nakada T, Tanaka M, Nishizawa M, Tanaka K. Identification of binding sites for anti-aquaporin 4 antibodies in patients with neuromyelitis optica. J Neuroimmunol 2009; 211:110-3. [PMID: 19410301 DOI: 10.1016/j.jneuroim.2009.04.001] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2008] [Revised: 03/04/2009] [Accepted: 04/01/2009] [Indexed: 11/19/2022]
Abstract
OBJECTIVE Anti-aquaporin 4 antibodies (AQP4-Ab) are specifically detected in patients with neuromyelitis optica. To investigate the role of AQP4-Ab, we examined the antibody binding epitope using human and mouse mutant AQP4. METHODS We constructed human and mouse amino acid substitution AQP4 mutants and compared the reactivity with wild-form of human, mouse and rat AQP4. RESULTS The decreased intensity of AQP4-Ab staining with mouse AQP4 was recovered to that of human AQP4 with the mouse mutant A228E for 9 of the 10 sera. CONCLUSIONS The third extracellular loop of AQP4 is considered to be the major epitope for AQP4-Ab in NMO.
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Affiliation(s)
- T Tani
- Department of Neurology, Brain Research Institute, Niigata University, Japan
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Kitaura H, Tsujita M, Huber VJ, Kakita A, Shibuki K, Sakimura K, Kwee IL, Nakada T. Activity-dependent glial swelling is impaired in aquaporin-4 knockout mice. Neurosci Res 2009; 64:208-12. [PMID: 19428702 DOI: 10.1016/j.neures.2009.03.002] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2008] [Revised: 02/27/2009] [Accepted: 03/03/2009] [Indexed: 11/15/2022]
Abstract
We investigated the role of aquaporin-4 (AQP4), a water channel expressed in glial cells, in neural activity mediated morphological changes observed in brain slice preparation. Changes in flavoprotein fluorescence (FF) and infrared light scattering (LS) signals were measured before and after repetitive stimulation of layer VI in rostral somatosensory cortical slices taken from AQP4 knockout (KO) and wild-type (WT) mice. Changes in FF, which reflect neural aerobic activities, were comparable for the two groups in all cortical layers. However, changes in LS signals, which are indicative of cell swelling, were significantly decreased in layer I of AQP4 KO mice compared to that of WT mice. We conclude that AQP4 likely plays a significant role in neural activity-dependent glial swelling.
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Affiliation(s)
- Hiroki Kitaura
- Center for Integrated Human Brain Science, Brain Research Institute, University of Niigata, Japan; Department of Neurophysiology, Brain Research Institute, University of Niigata, Japan
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27
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Huber VJ, Tsujita M, Kwee IL, Nakada T. Inhibition of Aquaporin 4 by antiepileptic drugs. Bioorg Med Chem 2009; 17:418-24. [DOI: 10.1016/j.bmc.2007.12.038] [Citation(s) in RCA: 100] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/11/2007] [Revised: 12/18/2007] [Accepted: 12/19/2007] [Indexed: 11/28/2022]
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Huber VJ, Tsujita M, Nakada T. Identification of aquaporin 4 inhibitors using in vitro and in silico methods. Bioorg Med Chem 2008; 17:411-7. [PMID: 18182301 DOI: 10.1016/j.bmc.2007.12.040] [Citation(s) in RCA: 78] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2007] [Revised: 12/18/2007] [Accepted: 12/19/2007] [Indexed: 12/19/2022]
Abstract
The in vitro inhibitory effects and in silico docking energies of 18 compounds with respect to aquaporin 4 (AQP4) were investigated. More than half of the compounds tested showed inhibitory activity in the in vitro functional assay and included the 5-HT(1B/1D) agonists sumatriptan, and rizatriptan. Moreover, the observed inhibitory activity of the compounds used in this study at 20 microM showed a strong correlation with their in silico docking energies, r(2)=0.64, which was consistent with that found in previous studies. The AQP4 inhibitory IC(50) values of three compounds, 2-(nicotinamido)-1,3,4-thiadiazole, sumatriptan and rizatriptan, were subsequently found to be 3, 11, and 2 microM, respectively.
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Affiliation(s)
- Vincent J Huber
- Center for Integrated Human Brain Science, Brain Research Institute, University of Niigata, Chuo-ku, 1 Asahi Machi Dori, Niigata 951-8585, Japan
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29
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Petrenko AB, Tsujita M, Kohno T, Sakimura K, Baba H. Mutation of alpha1G T-type calcium channels in mice does not change anesthetic requirements for loss of the righting reflex and minimum alveolar concentration but delays the onset of anesthetic induction. Anesthesiology 2007; 106:1177-85. [PMID: 17525593 DOI: 10.1097/01.anes.0000267601.09764.e6] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [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: 10/23/2022]
Abstract
BACKGROUND T-type calcium channels regulate neuronal membrane excitability and participate in a number of physiologic and pathologic processes in the central nervous system, including sleep and epileptic activity. Volatile anesthetics inhibit native and recombinant T-type calcium channels at concentrations comparable to those required to produce anesthesia. To determine whether T-type calcium channels are involved in the mechanisms of anesthetic action, the authors examined the effects of general anesthetics in mutant mice lacking alpha1G T-type calcium channels. METHODS The hypnotic effects of volatile and intravenous anesthetics administered to mutant and C57BL/6 control mice were evaluated using the behavioral endpoint of loss of righting reflex. To investigate the immobilizing effects of volatile anesthetics in mice, the minimum alveolar concentration (MAC) values were determined using the tail-clamp method. RESULTS The 50% effective concentration for loss of righting reflex and MAC values for volatile anesthetics were not altered after alpha1G channel knockout. However, mutant mice required significantly more time to develop anesthesia/hypnosis after exposure to isoflurane, halothane, and sevoflurane and after intraperitoneal administration of pentobarbital. CONCLUSIONS The 50% effective concentration for loss of righting reflex and MAC values for the volatile anesthetics were not altered after alpha1G calcium channel knockout, indicating that normal functioning of alpha1G calcium channels is not required for the maintenance of anesthetic hypnosis and immobility. However, the timely induction of anesthesia/hypnosis by volatile anesthetic agents and some intravenous anesthetic agents may require the normal functioning of these channel subunits.
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Affiliation(s)
- Andrey B Petrenko
- Division of Anesthesiology, Niigata University Graduate School of Medical and Dental Sciences, Department of Integrated Neuroscience, Center for Integrated Human Brain Science, Brain Research Institute, Niigata University, Japan.
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Tanaka K, Tani T, Tanaka M, Saida T, Idezuka J, Yamazaki M, Tsujita M, Nakada T, Sakimura K, Nishizawa M. Anti-aquaporin 4 antibody in selected Japanese multiple sclerosis patients with long spinal cord lesions. Mult Scler 2007; 13:850-5. [PMID: 17468440 DOI: 10.1177/1352458507076976] [Citation(s) in RCA: 90] [Impact Index Per Article: 5.3] [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: 11/17/2022]
Abstract
Multiple sclerosis (MS) in Asian populations is often characterized by the selective involvement of the optic nerve (ON) and spinal cord (SP) (OSMS) in contrast to classic MS (CMS), where frequent lesions are observed in the cerebrum, cerebellum or brainstem. In Western countries, inflammatory demyelinating disease preferentially involving the ON and SP is called neuromyelitis optica (NMO). Recently, Lennon et al. discovered that NMO-IgG, shown to bind to aquaporin 4 (AQP4), could be a specific marker of NMO and also of Japanese OSMS whose clinical features were identical to NMO having long spinal cord lesions extending over three vertebral segments (LCL). To examine this antibody in larger populations of Japanese OSMS patients in order to know its epidemiological and clinical spectra, we established an immunohistochemical detection system for the anti-AQP4 antibody (AQP4-Ab) using the AQP4-transfected human embryonic kidney cell line (HEK-293) and confirmed AQP4-Ab positivity together with the immunohistochemical staining pattern of NMO-IgG in approximately 60% of Japanese OSMS patients with LCL. Patients with OSMS without LCL and those with CMS were negative for this antibody. Our results accorded with those of Lennon et al. suggest that Japanese OSMS with LCL may have an underlying pathogenesis in common with NMO.
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Affiliation(s)
- K Tanaka
- Department of Neurology, Brain Research Institute, Niigata University, Niigata Japan.
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31
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Huber VJ, Tsujita M, Yamazaki M, Sakimura K, Nakada T. Identification of arylsulfonamides as Aquaporin 4 inhibitors. Bioorg Med Chem Lett 2007; 17:1270-3. [PMID: 17178220 DOI: 10.1016/j.bmcl.2006.12.010] [Citation(s) in RCA: 106] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2006] [Accepted: 12/04/2006] [Indexed: 11/21/2022]
Abstract
Carbonic anhydrase inhibitors AZA, EZA, and 4-acetamidobenzsulfonamide were found to inhibit human AQP4-M23 mediated water transport by 80%, 68%, and 23%, respectively, at 20 microM in an in vitro functional assay. AZA was found to have an IC50 against AQP4 of 0.9 microM. Phloretin was inactive under the same conditions.
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Affiliation(s)
- Vincent J Huber
- Center for Integrated Human Brain Science, Brain Research Institute, University of Niigata, 1-757 Asahi Machi Dori, Niigata 951-8585, Japan.
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Fukaya M, Tsujita M, Yamazaki M, Kushiya E, Abe M, Akashi K, Natsume R, Kano M, Kamiya H, Watanabe M, Sakimura K. Abundant distribution of TARP gamma-8 in synaptic and extrasynaptic surface of hippocampal neurons and its major role in AMPA receptor expression on spines and dendrites. Eur J Neurosci 2006; 24:2177-90. [PMID: 17074043 DOI: 10.1111/j.1460-9568.2006.05081.x] [Citation(s) in RCA: 117] [Impact Index Per Article: 6.5] [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: 12/01/2022]
Abstract
Transmembrane alpha-amino-3-hydroxyl-5-isoxazolepropionate (AMPA) receptor regulatory proteins (TARPs) play pivotal roles in AMPA receptor trafficking and gating. Here we examined cellular and subcellular distribution of TARP gamma-8 in the mouse brain. Immunoblot and immunofluorescence revealed the highest concentration of gamma-8 in the hippocampus. Immunogold electron microscopy demonstrated dense distribution of gamma-8 on the synaptic and extrasynaptic surface of hippocampal neurons with very low intracellular labeling. Of the neuronal surface, gamma-8 was distributed at the highest level on asymmetrical synapses of pyramidal cells and interneurons, whereas their symmetrical synapses selectively lacked immunogold labeling. Then, the role of gamma-8 in AMPA receptor expression was pursued in the hippocampus using mutant mice defective in the gamma-8 gene. In the mutant cornu ammonis (CA)1 region, synaptic and extrasynaptic AMPA receptors on dendrites and spines were severely reduced to 35-37% of control levels, whereas reduction was mild for extrasynaptic receptors on somata (74%) and no significant decrease was seen for intracellular receptors within spines. In the mutant CA3 region, synaptic AMPA receptors were reduced mildly at asymmetrical synapses in the stratum radiatum (67% of control level), and showed no significant decrease at mossy fiber-CA3 synapses. Therefore, gamma-8 is abundantly distributed on hippocampal excitatory synapses and extrasynaptic membranes, and plays an important role in increasing the number of synaptic and extrasynaptic AMPA receptors on dendrites and spines, particularly, in the CA1 region. Variable degrees of reduction further suggest that other TARPs may also mediate this function at different potencies depending on hippocampal subregions, input sources and neuronal compartments.
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Affiliation(s)
- Masahiro Fukaya
- Department of Anatomy, Hokkaido University School of Medicine, Sapporo 060-8638, Japan
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Tsujita M, Wu CA, Okazaki M, Yokoyama S. 1P-0229∗ HDL assembly in hepatocytes. ATHEROSCLEROSIS SUPP 2003. [DOI: 10.1016/s1567-5688(03)90300-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: 10/25/2022]
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Takeuchi T, Nomura T, Tsujita M, Suzuki M, Fuse T, Mori H, Mishina M. Flp recombinase transgenic mice of C57BL/6 strain for conditional gene targeting. Biochem Biophys Res Commun 2002; 293:953-7. [PMID: 12051751 DOI: 10.1016/s0006-291x(02)00321-2] [Citation(s) in RCA: 50] [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: 10/27/2022]
Abstract
We constructed an expression vector of Flp recombinase modified by adding a nuclear localization signal. Injection of the expression vector into fertilized eggs of the C57BL/6 strain yielded transgenic mouse lines expressing the Flp recombinase transgene in the testis. We crossed the transgenic mice to reporter mice carrying the neomycin phosphotransferase gene flanked by target sites of Flp recombinase. Examination of the deletion of the neomycin phosphotransferase gene in the progeny showed that Flp-mediated recombination took place efficiently in vivo in FLP66 transgenic mouse line. These results suggest that the Flp recombinase system is effective in mice and in combination with the Cre recombinase system extends the potentials of gene manipulation in mice. One of the useful applications of FLP66 transgenic mouse line is the removal of marker genes from mice manipulated for the conditional gene targeting with the Cre/loxP system in the pure C57BL/6 genetic background.
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Affiliation(s)
- Tomonori Takeuchi
- Department of Molecular Neurobiology and Pharmacology, Graduate School of Medicine, University of Tokyo, Japan
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35
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Ohsawa N, Tsujita M, Morikawa S, Itoh N. Purification and characterization of a monohalomethane-producing enzyme S-adenosyl-L-methionine: halide ion methyltransferase from a marine microalga, Pavlova pinguis. Biosci Biotechnol Biochem 2001; 65:2397-404. [PMID: 11791711 DOI: 10.1271/bbb.65.2397] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.3] [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: 11/08/2022]
Abstract
A monohalomethane-producing enzyme, S-adenosyl-L-methionine-dependent halide ion methyltransferase (EC 2.1.1.-) was purified from the marine microalga Pavlova pinguis by two anion exchange, hydroxyapatite and gel filtration chromatographies. The methyltransferase was a monomeric molecule having a molecular weight of 29,000. The enzyme had an isoelectric point at 5.3, and was optimally active at pH 8.0. The Km for iodide and SAM were 12 mM and 12 microM, respectively, which were measured using a partially purified enzyme. Various metal ions had no significant effect on methyl iodide production, suggesting that the enzyme does not require metal ions. The enzyme reaction strictly depended on SAM as a methyl donor, and the enzyme catalyzed methylation of the I-, Br-, and Cl- to corresponding monohalomethanes and of bisulfide to methyl mercaptan.
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Affiliation(s)
- N Ohsawa
- Biotechnology Research Center, Toyama Prefectural University, Japan
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36
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Takeuchi T, Kiyama Y, Nakamura K, Tsujita M, Matsuda I, Mori H, Munemoto Y, Kuriyama H, Natsume R, Sakimura K, Mishina M. Roles of the glutamate receptor epsilon2 and delta2 subunits in the potentiation and prepulse inhibition of the acoustic startle reflex. Eur J Neurosci 2001; 14:153-60. [PMID: 11488959 DOI: 10.1046/j.0953-816x.2001.01620.x] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [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: 11/20/2022]
Abstract
We examined the regulation of the acoustic startle response in mutant mice of the N-methyl-D-aspartate (NMDA)- and delta-subtypes of the glutamate receptor (GluR) channel, which play important roles in neural plasticity in the forebrain and the cerebellum, respectively. Heterozygous mutant mice with reduced GluRepsilon2 subunits of the NMDA receptor showed strongly enhanced startle responses to acoustic stimuli. On the other hand, heterozygous and homozygous mutation of the other NMDA receptor GluRepsilon subunits exerted no, or only small effects on acoustic startle responses. The threshold of the auditory brainstem response of the GluRepsilon2-mutant mice was comparable to that of the wild-type littermates. The primary circuit of the acoustic startle response is a relatively simple oligosynaptic pathway located in the lower brainstem, whilst the expression of GluRepsilon2 is restricted to the forebrain. We thus suggest that the NMDA receptor GluRepsilon2 subunit plays a role in the regulation of the startle reflex. Ablation of the cerebellar Purkinje cell-specific delta2 subunit of the GluR channel exerted little effect on the acoustic startle response but resulted in the enhancement of prepulse inhibition of the reflex. Because inhibition of the acoustic startle response by a weak prepulse is a measure of sensorimotor gating, the process by which an organism filters sensory information, these observations indicate the involvement of the cerebellum in the modulation of sensorimotor gating.
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Affiliation(s)
- T Takeuchi
- Department of Molecular Neurobiology and Pharmacology, Graduate School of Medicine, University of Tokyo and CREST, Japan Science and Technology Corporation, Tokyo 113-0033, Japan
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Tomimoto S, Tsujita M, Okazaki M, Usui S, Tada T, Fukutomi T, Ito S, Itoh M, Yokoyama S. Effect of probucol in lecithin-cholesterol acyltransferase-deficient mice: inhibition of 2 independent cellular cholesterol-releasing pathways in vivo. Arterioscler Thromb Vasc Biol 2001; 21:394-400. [PMID: 11231919 DOI: 10.1161/01.atv.21.3.394] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Cellular cholesterol release takes place by at least 2 distinct mechanisms: the lecithin-cholesterol acyltransferase (LCAT)-driven net efflux by cholesterol diffusion and the generation of high density lipoprotein (HDL) with cellular cholesterol and phospholipid on the cell-apolipoprotein interaction. Therefore, LCAT deficiency impairs the former pathway, and the latter can be inhibited by probucol, which interferes with the apolipoprotein-cell interaction. Hence, probucol was given to the LCAT-deficient mice in the attempt to suppress both of these pathways. The mice were fed low (0.2%) and high (1.2%) cholesterol diets containing 0.5% probucol for 2 weeks. LCAT deficiency and probucol markedly decreased plasma HDL, and the effects were synergistic. Tissue cholesterol content was lower in the adrenal glands and ovaries in the LCAT-deficient mice and in the probucol-treated mice, suggesting that HDL is a main cholesterol provider for these organs. It was also moderately decreased in the spleen of the low cholesterol-fed female mice and in the thyroid gland of the low cholesterol-fed male mice. On the other hand, the esterified cholesterol content in the liver was substantially increased by the probucol treatment with a high cholesterol diet in the LCAT-deficient mice but not in the wild-type mice. Among the groups, there was no significant difference in the tissue cholesterol levels in other organs, such as the liver, spleen, thymus, brain, erythrocytes, thyroid gland, testis, and aorta, resulting from either LCAT deficiency or probucol. Thus, the apolipoprotein-mediated mechanism plays a significant role in the export of cellular cholesterol in the liver, indicating that the liver is a major site of the HDL assembly. Otherwise, tissue cholesterol homeostasis can largely be maintained in mice even when the assembly of new HDL is inhibited by probucol in the absence of LCAT. Nonspecific diffusion of cholesterol perhaps adequately maintains the homeostasis in the experimental condition.
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Affiliation(s)
- S Tomimoto
- Department of Biochemistry, School of Nursing, Nagoya City University, Nagoya, Japan
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38
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Okabe N, Tsujita M. catena-Poly[[diaqualithium(I)]-mu-[9H-purine-2,6(1H, 3H)-dionato-O2:N7]]. Acta Crystallogr C 2000; 56:1418-9. [PMID: 11118971 DOI: 10.1107/s0108270100011999] [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] [Received: 02/28/2000] [Accepted: 08/31/2000] [Indexed: 11/10/2022] Open
Abstract
In the title compound, [Li(C(5)H(3)N(4)O(2))(H(2)O)(2)](n), the coordinate geometry about the Li(+) ion is distorted tetrahedral and the Li(+) ion is bonded to N and O atoms of adjacent ligand molecules forming an infinite polymeric chain with Li-O and Li-N bond lengths of 1.901 (5) and 2.043 (6) A, respectively. Tetrahedral coordination at the Li(+) ion is completed by two cis water molecules [Li-O 1.985 (6) and 1.946 (6) A]. The crystal structure is stabilized both by the polymeric structure and by a hydrogen-bond network involving N-H.O, O-H.O and O-H.N hydrogen bonds.
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Affiliation(s)
- N Okabe
- Faculty of Pharmaceutical Sciences, Kinki University, Kowakae 3-4-1, Higashiosaka, Osaka 577-8502, Japan.
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39
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Yamada T, Suzuki M, Tsujita M, Watanabe Y, Takeda J. [Anesthetic management for distal aortic arch aneurysm stent grafting]. Masui 2000; 49:1254-6. [PMID: 11215236] [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: 02/19/2023]
Abstract
A 76-year-old woman with thoracic aortic aneurysm involving distal aortic arch was scheduled for graft replacement from ascending to proximal aortic arch with endovascular stent graft to descending aorta. Surgical procedures were performed under median sternotomy with hypothermic systemic circulation arrest and selective cerebral perfusion. The stent graft composed of 30 mm Gianturco Z stent and 27.5 mm woven Dacron graft was introduced into the descending aorta under the guidance of transesophageal echocardiography (TEE) and fluoroscopy. Ascending and proximal aortic arch replacement was then performed with four branched woven Dacron graft. The aortic pathology was confirmed by TEE and the extent of the aneurysmal lesion was defined. TEE was also useful to find the dislodgement of the stent graft after deployment. This surgical technique, being less invasive than conventional thoracotomy, would be indicated for elderly patients with distal aortic arch aneurysm. TEE is the vital imaging technique for placement of the stent graft, as well as for intraoperative cardiac monitoring.
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Affiliation(s)
- T Yamada
- Department of Anesthesiology, School of Medicine, Keio University, Tokyo 160-8582
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40
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Ribeiro-Dias F, Marzagão Barbuto JA, Tsujita M, Jancar S. Discrimination between NK and LAK cytotoxic activities of murine spleen cells by MTT assay: differential inhibition by PGE(2) and EDTA. J Immunol Methods 2000; 241:121-9. [PMID: 10915854 DOI: 10.1016/s0022-1759(00)00206-4] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
In the present study we propose a mathematical approach to improve the analysis of NK and LAK activities measured by MTT assay adapted for murine cells. We found that to calculate NK activity, high E:T ratios should be used (up to 50:1) and the phenomenon fits to a linear least-squares analysis. However, 5-fold less effector cells (10:1, E:T) should be used to detect LAK activity and the phenomenon has a nonlinear exponential behavior. Using this approach, we showed that EDTA inhibits LAK but not NK activity whereas PGE(2) inhibits NK but not LAK activity. In conclusion, this analytical approach allowed the discrimination between NK and LAK activities and exposed differences between these two cytotoxic activities.
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Affiliation(s)
- F Ribeiro-Dias
- Department of Immunology, Institute of Biomedical Sciences, University of São Paulo, Brazil
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41
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Sugimoto K, Suzuki K, Tsujita M, Yokoyama S. Inhibition of ACAT enhances APOA-I-Mediated Cellular cholesterol efflux by increasing the APOA-I/CELL interaction. Atherosclerosis 2000. [DOI: 10.1016/s0021-9150(00)80850-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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42
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Tsujita M, Tomimoto S, Okumura-Noji K, Okazaki M, Yokoyama S. Apolipoprotein-mediated cellular cholesterol/phospholipid efflux and plasma high density lipoprotein level in mice. Biochim Biophys Acta 2000; 1485:199-213. [PMID: 10832100 DOI: 10.1016/s1388-1981(00)00061-5] [Citation(s) in RCA: 34] [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] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Helical apolipoprotein(apo)s generate pre-beta-high density lipoprotein (HDL) by removing cellular cholesterol and phospholipid upon the interaction with cells. To investigate its physiological relevance, we studied the effect of an in vitro inhibitor of this reaction, probucol, in mice on the cell-apo interaction and plasma HDL levels. Plasma HDL severely dropped in a few days with probucol-containing chow while low density protein decreased more mildly over a few weeks. The peritoneal macrophages were assayed for apoA-I binding, apoA-I-mediated release of cellular cholesterol and phospholipid and the reduction by apoA-I of the ACAT-available intracellular cholesterol pool. All of these parameters were strongly suppressed in the probucol-fed mice. In contrast, the mRNA levels of the potential regulatory proteins of the HDL level such as apoA-I, apoE, LCAT, PLTP, SRB1 and ABC1 did not change with probucol. The fractional clearance rate of plasma HDL-cholesteryl ester was uninfluenced by probucol, but that of the HDL-apoprotein was slightly increased. No measurable CETP activity was detected either in the control or probucol-fed mice plasma. The change in these functional parameters is consistent with that observed in the Tangier disease patients. We thus concluded that generation of HDL by apo-cell interaction is a major source of plasma HDL in mice.
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Affiliation(s)
- M Tsujita
- Biochemistry 1, Nagoya City University Medical School, Japan
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43
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Tsujita M. Cerebellar granule cell-specific and inducible gene targeting system. Neurosci Res 2000. [DOI: 10.1016/s0168-0102(00)81036-6] [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: 11/26/2022]
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44
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Francis GA, Tsujita M, Terry TL. Apolipoprotein AI efficiently binds to and mediates cholesterol and phospholipid efflux from human but not rat aortic smooth muscle cells. Biochemistry 1999; 38:16315-22. [PMID: 10587456 DOI: 10.1021/bi991742b] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.7] [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: 11/30/2022]
Abstract
Aortic smooth muscle cells (SMC) from several animal species have been reported to resist depletion of cellular cholesterol by the major apolipoprotein of HDL, apoAI. Resistance of SMC to this protective action of apoAI, if present in humans, could contribute to the overaccumulation of arterial wall cholesterol seen in atherosclerosis. We investigated the ability of human aortic medial SMC to bind and be depleted of cholesterol and phospholipids by apoAI. In contrast to rat aortic SMC, but similar to human fibroblasts, human SMC were readily depleted of cholesterol by apoAI, measured by a marked depletion of intracellular cholesterol available for esterification, and an increase in cholesterol efflux to the medium. Human SMC were also actively depleted of the phospholipids phosphatidylcholine and sphingomyelin by apoAI. In contrast, rat SMC released only a small fraction of these cellular phospholipids to apoAI-containing medium. (125)I-labeled apoAI bound with high affinity and specificity to human SMC, but failed to bind to rat SMC. Similar levels of expression of class B, type I scavenger receptor (SR-BI) and caveolin in human and rat SMC suggested these proteins do not account for the differences in apoAI binding or lipid efflux seen in these cells. An enhancer of apolipoprotein-mediated cholesterol efflux, tyrosyl radical-oxidized HDL, markedly amplified the depletion of cholesterol available for esterification in human SMC compared to HDL, but had no enhanced effect in rat SMC. These results show that human SMC bind and are readily depleted of cellular lipids by apoAI, and suggest that apoAI-mediated cholesterol efflux from arterial SMC may contribute significantly to the circulating pool of HDL cholesterol in vivo. The marked difference in apoAI binding to human and rat arterial SMC provides an excellent model to study the nature of the apoAI-cell binding interaction.
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MESH Headings
- Animals
- Aorta, Thoracic/cytology
- Aorta, Thoracic/metabolism
- Apolipoprotein A-I/metabolism
- Apolipoprotein A-I/physiology
- Biological Transport
- CD36 Antigens/metabolism
- Caveolin 1
- Caveolins
- Cells, Cultured
- Cholesterol/metabolism
- Humans
- Infant
- Lipoproteins, HDL/metabolism
- Membrane Proteins/metabolism
- Muscle, Smooth, Vascular/cytology
- Muscle, Smooth, Vascular/metabolism
- Phospholipids/metabolism
- Protein Binding
- Rats
- Receptors, Immunologic/biosynthesis
- Receptors, Lipoprotein/metabolism
- Receptors, Scavenger
- Scavenger Receptors, Class B
- Sterol O-Acyltransferase/metabolism
- Tyrosine/metabolism
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Affiliation(s)
- G A Francis
- Lipid and Lipoprotein Research Group, Department of Medicine, University of Alberta, Edmonton, Canada.
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45
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Tsujita M, Mori H, Watanabe M, Suzuki M, Miyazaki J, Mishina M. Cerebellar granule cell-specific and inducible expression of Cre recombinase in the mouse. J Neurosci 1999; 19:10318-23. [PMID: 10575029 PMCID: PMC6782411] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023] Open
Abstract
To develop a cell type-specific and temporal regulation system of gene targeting in the cerebellum, we used the NMDA-type glutamate receptor GluRepsilon3 subunit gene and Cre recombinase-progesterone receptor fusion (CrePR) gene in combination. Injection of the CrePR gene placed under the control of the 10 kb 5' region of the GluRepsilon3 gene into C57BL/6 eggs yielded the ECP25 line that strongly expressed the CrePR mRNA selectively in the granule cells of the cerebellum. Using a transgenic mouse carrying a reporter gene for Cre-mediated recombination, we showed that antiprogestins could induce the recombinase activity of CrePR protein in the cerebellar granule cells of the ECP25 line. Thus, the established mouse line will provide a valuable tool to investigate the mechanism of cerebellar function by manipulating molecules in the temporally regulated and granule cell-specific manner.
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Affiliation(s)
- M Tsujita
- Department of Molecular Neurobiology, School of Medicine, University of Tokyo, Tokyo 113-0033, Japan
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46
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Li Q, Tsujita M, Yokoyama S. Selective down-regulation by protein kinase C inhibitors of apolipoprotein-mediated cellular cholesterol efflux in macrophages. Biochemistry 1997; 36:12045-52. [PMID: 9315842 DOI: 10.1021/bi970079t] [Citation(s) in RCA: 61] [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: 02/05/2023]
Abstract
Extracellular apolipoprotein A-I removed cholesterol and phospholipid from cholesterol-loaded mouse peritoneal macrophage and thereby generated a prebeta high-density lipoprotein (HDL) particle having a weight ratio of cholesterol to phosphatidylcholine of approximately 1:1. Treatment of the cells with phorbol myristate slightly increased cholesterol efflux by this mechanism without influencing the nonspecific cholesterol efflux to the lipid microemulsion. When the cells were treated by protein kinase C (PKC) inhibitors, H7 and staurosporine, apolipoprotein-mediated cellular cholesterol efflux was substantially reduced without a significant change in phosphatidylcholine efflux, resulting in generation of cholesterol-poor prebeta-HDL particles having a weight ratio of cholesterol to phosphatidylcholine as low as 1:10. In spite of this change, specific binding of apoA-I to the cellular surface was unaffected. Cellular cholesterol available for acylCoA:cholesterol acyltransferase (ACAT) was rapidly depleted by adding apoA-I to the medium, and the PKC inhibitor treatment reversed this effect. In contrast, nonspecific cellular cholesterol efflux to the lipid microemulsion did not influence the ACAT-available cellular cholesterol pool, and it was not influenced by the PKC inhibitors. Thus, we concluded that apolipoprotein-mediated cellular cholesterol efflux is linked to mobilization of cholesterol from an intracellular pool used by ACAT to a specific pool for apolipoprotein-mediated prebeta-HDL generation, in response to apolipoprotein-cell interaction and subsequent intracellular signaling. Binding of apolipoprotein to the cell surface is required for assembly of the prebeta-HDL particle with cellular phospholipid, and the intracellular cholesterol mobilization is needed for enrichment with cholesterol of the prebeta-HDL. These reactions are largely independent of diffusion-mediated nonspecific cell cholesterol efflux.
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Affiliation(s)
- Q Li
- Biochemistry I, Nagoya City University Medical School, Japan
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47
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Abstract
We attempted to demonstrate selective modulation of lipid-free apolipoprotein-mediated cellular lipid efflux in order to test the hypothesis that it is an event independent of nonspecific physicochemical cholesterol exchange. Probucol, a unique cholesterol-lowering drug, was found to selectively suppress this pathway in vitro in mouse peritoneal macrophage. Probucol was given to the cells via the uptake of acetylated low-density lipoprotein (LDL) into which it had been incorporated. The uptake of lipoprotein-cholesteryl ester by the macrophage was the same whether the acetylated LDL was probucol-carrying or probucol-free, and probucol accumulated in the cell in parallel to cholesterol when carried by the lipoprotein. Incorporation of [35S]methionine into cell protein was unaffected by probucol accumulated in the cells. The efflux of cellular cholesterol and phospholipid mediated by lipid-free human apolipoproteins (apo) A-I, A-II, and E was all completely inhibited by probucol. Reversible binding of free apoA-I to the cellular surface was also completely blocked by probucol in this condition. On the other hand, nonspecific cholesterol exchange between LDL and macrophage was unaffected by probucol. Thus, probucol selectively inhibited apolipoprotein-mediated cellular lipid efflux by blocking specific binding of free apolipoprotein to the cell without influencing nonspecific lipid exchange. In the absence of lecithin: cholesterol acyltransferase (LCAT) reaction, apparent cellular cholesterol efflux to high-density lipoprotein (HDL) was reduced by probucol by 40-70% while the rate of cholesterol influx from HDL to the cells was unaffected, resulting in cancellation of the net cellular cholesterol efflux to HDL. However, the increase of the net cholesterol efflux to HDL by LCAT was unaffected by probucol. Net cellular cholesterol efflux to HDL in the absence of LCAT, therefore, seems to depend on an apolipoprotein-mediated mechanism.
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Affiliation(s)
- M Tsujita
- Lipid and Lipoprotein Research Group, University of Alberta, Edmonton, Canada
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48
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Yasumoto R, Kawanishi H, Tsujino T, Tsujita M, Nishisaka N, Horii A, Kishimoto T. Clinical evaluation of long-term treatment using cernitin pollen extract in patients with benign prostatic hyperplasia. Clin Ther 1995; 17:82-7. [PMID: 7538904 DOI: 10.1016/0149-2918(95)80009-3] [Citation(s) in RCA: 24] [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: 01/25/2023]
Abstract
Seventy-nine patients with benign prostatic hyperplasia (BPH) were treated with cernitin pollen extract. Patient ages ranged from 62 to 89 years (mean, 68 years). Mean baseline prostatic volume was 33.2 cm3. Cernitin pollen extract was administered in a dosage of 126 mg (2 tablets, 63 mg each), three times a day, for more than 12 weeks. Symptom scores, based on a modified Boyarsky scoring scale, uroflowmetry, prostatic volume, residual urine volume, and urinalysis results were examined before and after administration of cernitin pollen extract. Symptom scores significantly decreased from baseline, and the favorable results continued during the treatment period. Urine maximum flow rate and average flow rate increased significantly from 9.3 mL/s to 11 mL/s and from 5.1 mL/s to 6 mL/s, respectively. Residual urine volume decreased significantly from 54.2 mL to less than 30 mL. There was no change in prostatic volume. However, 28 patients treated for more than 1 year showed a mean decrease of prostatic volume to 26.5 cm3. No adverse reactions were observed. Clinical efficacy at 12 weeks was rated excellent, good, satisfactory, and poor in 11%, 39%, 35%, and 15% of patients, respectively. Overall clinical efficacy was 85%. In conclusion, cernitin pollen extract showed a mild beneficial effect on prostatic volume and urination variables in patients with symptomatic BPH.
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Affiliation(s)
- R Yasumoto
- Department of Urology and Andrology, Osaka Municipal Juso Citizens' Hospital, Japan
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49
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Ito S, Nishikawa K, Goto T, Tsujita M, Takegaki Y, Kishimoto T. [A case of hydronephrosis caused by renal stones with elevated serum levels of CA-19-9 and CA-125]. Hinyokika Kiyo 1994; 40:885-8. [PMID: 7992702] [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: 01/28/2023]
Abstract
A case of hydronephrosis caused by renal stones with elevated serum levels of carbohydrate antigens 19-9 (CA-19-9) and 125 (CA-125) is reported. A 74-year-old woman was hospitalized with pyelonephritis. The results of computerized tomography and endoscopy suggested that the patient did not have pancreatic or ovarian cancer, but laboratory tests were significant for serum CA-19-9 greater than 1,000 U/ml (normal less than 37) and serum CA-125 78 U/ml (normal less than 35), which are markers for such tumors. Abdominal X-ray films showed stones in the pelvis of the right kidney. Excretory urography showed that the right kidney was not functioning. Computerized tomography showed severe right hydronephrosis with a thin renal cortex. Complete obstruction of the ureteropelvic junction of the kidney was seen by retrograde pyelography. During percutaneous pyelography, aspiration of the pelvic urine was done, and the sample had a high concentration of CA-19-9 (250,000 U/ml), but no cancer cells. The patients underwent right nephrectomy. The pelvic urine was tested for both CA-19-9 and CA-125 this time, and both were high (190,000 U/ml and 5,100 U/ml, respectively). Pathological evaluation showed no evidence of a malignant tumor. The epithelium lining the renal pelvis was stained for both CA-19-9 and CA-125 using the avidin-biotin-peroxidase complex method. Serum levels of the markers returned to normal after nephrectomy.
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Affiliation(s)
- S Ito
- Department of Urology, Osaka Municipal Kita Citizens' Hospital
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50
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Maekawa T, Kashihara N, Tsujita M, Morikawa Y, Hayahara N, Nishijima T, Ezaki K, Senju M, Iritani M, Yamaguchi M. [Endocrine chemotherapy for prostatic cancer]. Hinyokika Kiyo 1994; 40:555-61. [PMID: 7521118] [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: 01/25/2023]
Abstract
We carried out a randomized joint study on endocrine therapy and endocrine chemotherapy for prostatic cancer at our department and 17 affiliated institutions. Of 80 patients entered, 39 patients were treated with chlormadinone acetate alone (group A) and 41 patients were treated with chlormadinone acetate in combination with UFT (group B). After excluding 10 inappropriate patients, Stage C was observed in 14 patients in group A and 13 in group B, and stage D in 20 patients in group A and 23 in group B. Side effects were observed in 8.8% (3/34) in group A and 22.2% (8/30) in group B without a significant difference. The anti-tumor effects (response rate) and clinical effects with respect to each item did not significantly differ between the two groups. The non-recurrence rate and survival rate were significantly higher in group B than in group A. These findings suggest the usefulness of endocrine chemotherapy using UFT.
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Affiliation(s)
- T Maekawa
- Department of Urology, Osaka City University Medical School
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