1
|
Sakota D, Kosaka R, Nagaoka E, Ohuchi K, Tahara T, Arai H, Sakanoue I, McCurry KR, Okamoto T. Left ventricular assist device mode: Co-pulse left ventricular unloading in a working mode of ex vivo heart perfusion. J Heart Lung Transplant 2023; 42:707-715. [PMID: 36931988 DOI: 10.1016/j.healun.2023.01.009] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Revised: 11/10/2022] [Accepted: 01/14/2023] [Indexed: 02/05/2023] Open
Abstract
BACKGROUND For normothermic ex vivo heart perfusion (EVHP), a resting mode and working mode have been proposed. We newly developed a left ventricular assist device (LVAD) mode that supports heart contraction by co-pulse synchronized LVAD. METHODS Following resting mode during time 0 to 1 hour, pig hearts (n = 18) were perfused in either resting, working, or LVAD mode during time 1 to 5 hour, and then myocardial function was evaluated in working mode at 6 hour. The preservation ratio was defined as the myocardial mechanical function at 330 minute divided by the function at 75 minute. In LVAD mode, LVAD unloaded the pressure and the volume in the left ventricle in the systolic phase. RESULTS The LVAD group was significantly associated with higher preservation ratios in cardiac output (resting, 33 ± 3; working, 35 ± 5; LVAD, 76% ± 5%; p < 0.001), stroke work, dP/dt maximum, and dP/dt minimum compared with the other groups. Glucose consumption was significantly reduced in the resting group. The LVAD group was significantly associated with higher myocardial oxygen consumption (resting, 2.2 ± 0.3; working; 4.6 ± 0.5; LVAD, 6.1 ± 0.5 mL O2/min/100 g, p < 0.001) and higher adenosine triphosphate (ATP) levels (resting, 1.1 ± 0.1; working, 0.7 ± 0.1; LVAD, 1.6 ± 0.2 μmol/g, p = 0.001) compared with the others. CONCLUSION These data suggest that myocardial mechanical function was better preserved in LVAD mode than in resting and working modes. Although our data suggested similar glycolysis activity in the LVAD and working groups, the higher final ATP in the LVAD group might be explained by reduced external work in LVAD.
Collapse
Affiliation(s)
- Daisuke Sakota
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan.
| | - Ryo Kosaka
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Ibaraki, Japan
| | - Eiki Nagaoka
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Katsuhiro Ohuchi
- Department of Advanced Surgical Technology Research and Development, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tomoki Tahara
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hirokuni Arai
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Ichiro Sakanoue
- Department of Thoracic and Cardiovascular Surgery, Cleveland Clinic, Cleveland, Ohio; Department of Inflammation and Immunology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio; Transplant Center, Cleveland Clinic, Cleveland, Ohio
| | - Kenneth R McCurry
- Department of Thoracic and Cardiovascular Surgery, Cleveland Clinic, Cleveland, Ohio; Department of Inflammation and Immunology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio; Transplant Center, Cleveland Clinic, Cleveland, Ohio
| | - Toshihiro Okamoto
- Department of Thoracic and Cardiovascular Surgery, Cleveland Clinic, Cleveland, Ohio; Department of Inflammation and Immunology, Lerner Research Institute, Cleveland Clinic, Cleveland, Ohio; Transplant Center, Cleveland Clinic, Cleveland, Ohio.
| |
Collapse
|
2
|
Sakurai H, Fujiwara T, Ohuchi K, Hijikata W, Inoue Y, Maruyama O, Tahara T, Yokota S, Tanaka Y, Takewa Y, Mizuno T, Arai H. Innovative experimental animal models for real-time comparison of antithrombogenicity between two oxygenators using dual extracorporeal circulation circuits and indocyanine green fluorescence imaging. Artif Organs 2023; 47:77-87. [PMID: 35957489 DOI: 10.1111/aor.14380] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2022] [Revised: 07/08/2022] [Accepted: 08/02/2022] [Indexed: 01/04/2023]
Abstract
BACKGROUND Antithrombogenicity of extracorporeal membrane oxygenation (ECMO) devices, particularly oxygenators, is a current problem, with numerous studies and developments underway. However, there has been limited progress in developing methods to accurately compare the antithrombogenicity of oxygenators. Animal experiments are commonly conducted to evaluate the antithrombogenicity of devices; however, it is challenging to maintain a steady experimental environment. We propose an innovative experimental animal model to evaluate different devices in a constant experimental environment in real-time. METHODS This model uses two venous-arterial ECMO circuits attached to one animal (one by jugular vein and carotid artery, one by femoral vein and artery) and real-time assessment of thrombus formation in the oxygenator by indocyanine green (ICG) fluorescence imaging. Comparison studies were conducted using three pigs: one to compare different oxygenators (MERA vs. CAPIOX) (Case 1), and two to compare antithrombotic properties of the oxygenator (QUADROX) when used under different hydrodynamic conditions (continuous flow vs. pulsatile flow) (Cases 2 and 3). RESULTS Thrombi, visualized using ICG imaging, appeared as black dots on a white background in each oxygenator. In Case 1, differences in the site of thrombus formation and rate of thrombus growth were observed in real-time in two oxygenators. In Case 2 and 3, the thrombus region was smaller in pulsatile than in continuous conditions. CONCLUSIONS We devised an innovative experimental animal model for comparison of antithrombogenicity in ECMO circuits. This model enabled simultaneous evaluation of two different ECMO circuits under the same biological conditions and reduced the number of sacrificed experimental animals.
Collapse
Affiliation(s)
- Hironobu Sakurai
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tatsuki Fujiwara
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Katsuhiro Ohuchi
- Center for Experimental Animals, Tokyo Medical and Dental University, Tokyo, Japan
| | - Wataru Hijikata
- School of Engineering, Tokyo Institute of Technology, Tokyo, Japan
| | - Yusuke Inoue
- Advanced Medical Engineering Research Center, Asahikawa Medical University, Asahikawa, Japan
| | - Osamu Maruyama
- Health and Medical Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, Japan
| | - Tomoki Tahara
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Sachie Yokota
- Faculty of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - Yui Tanaka
- School of Engineering, Tokyo Institute of Technology, Tokyo, Japan
| | - Yoshiaki Takewa
- Advanced Medical Engineering Research Center, Asahikawa Medical University, Asahikawa, Japan
| | - Tomohiro Mizuno
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hirokuni Arai
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| |
Collapse
|
3
|
Sakota D, Kosaka R, Nagaoka E, Ohuchi K, Tahara T, Arai H, Sakanoue I, McCurry K, Okamoto T. Left Ventricular Assist Device Mode: Co-Pulse Left Ventricular Unloading in Working Mode of Ex Vivo Heart Perfusion. J Heart Lung Transplant 2022. [DOI: 10.1016/j.healun.2022.01.229] [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] Open
|
4
|
Sakurai H, Fujiwara T, Ohuchi K, Hijikata W, Inoue Y, Seki H, Tahara T, Yokota S, Ogata A, Mizuno T, Arai H. Novel application of indocyanine green fluorescence imaging for real-time detection of thrombus in a membrane oxygenator. Artif Organs 2021; 45:1173-1182. [PMID: 34037247 DOI: 10.1111/aor.13999] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2021] [Revised: 04/17/2021] [Accepted: 05/11/2021] [Indexed: 12/31/2022]
Abstract
Extracorporeal membrane oxygenation (ECMO) plays an important role in the coronavirus disease 2019 (COVID-19) pandemic. Management of thrombi in ECMO is generally an important issue; especially in ECMO for COVID-19 patients who are prone to thrombus formation, the thrombus formation in oxygenators is an unresolved issue, and it is very difficult to deal with. To prevent thromboembolic complications, it is necessary to develop a method for early thrombus detection. We developed a novel method for detailed real-time observation of thrombi formed in oxygenators using indocyanine green (ICG) fluorescence imaging. The purpose of this study was to verify the efficacy of this novel method through animal experiments. The experiments were performed three times using three pigs equipped with veno-arterial ECMO comprising a centrifugal pump (CAPIOX SL) and an oxygenator (QUADROX). To create thrombogenic conditions, the pump flow rate was set at 1 L/min without anticoagulation. The diluted ICG (0.025 mg/mL) was intravenously administered at a dose of 10 mL once an hour. A single dose of ICG was 0.25mg. The oxygenator was observed with both an optical detector (PDE-neo) and the naked eye every hour after measurement initiation for a total of 8 hours. With this dose of ICG, we could observe it by fluorescence imaging for about 15 minutes. Under ICG imaging, the inside of the oxygenator was observed as a white area. A black dot suspected to be the thrombus appeared 6-8 hours after measurement initiation. The thrombus and the black dot on ICG imaging were finely matched in terms of morphology. Thus, we succeeded in real-time thrombus detection in an oxygenator using ICG imaging. The combined use of ICG imaging and conventional routine screening tests could compensate for each other's weaknesses and significantly improve the safety of ECMO.
Collapse
Affiliation(s)
- Hironobu Sakurai
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tatsuki Fujiwara
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Katsuhiro Ohuchi
- Department of Advanced Surgical Technology Research and Development, Tokyo Medical and Dental University, Tokyo, Japan
| | - Wataru Hijikata
- School of Engineering, Tokyo Institute of Technology, Tokyo, Japan
| | - Yusuke Inoue
- Advanced Medical Engineering Research Center, Asahikawa Medical University, Asahikawa, Japan
| | - Haruna Seki
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tomoki Tahara
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Sachie Yokota
- Faculty of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - Asato Ogata
- Faculty of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tomohiro Mizuno
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hirokuni Arai
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| |
Collapse
|
5
|
Seki H, Fujiwara T, Hijikata W, Murashige T, Tahara T, Yokota S, Ogata A, Ohuchi K, Mizuno T, Arai H. Evaluation of real-time thrombus detection method in a magnetically levitated centrifugal blood pump using a porcine left ventricular assist circulation model. Artif Organs 2021; 45:726-735. [PMID: 33432615 DOI: 10.1111/aor.13915] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [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: 09/25/2020] [Revised: 12/16/2020] [Accepted: 01/04/2021] [Indexed: 01/08/2023]
Abstract
Pump thrombosis induces significant complications and requires timely detection. We proposed real-time monitoring of pump thrombus in a magnetically levitated centrifugal blood pump (mag-lev pump) without using additional sensors, by focusing on the changes in the displacement of the pump impeller. The phase difference between the current and displacement of the impeller increases with pump thrombus. This thrombus detection method was previously evaluated through simulated circuit experiments using porcine blood. Evaluation of real-time thrombus detection in a mag-lev blood pump was performed using a porcine left ventricular assist circulation model in this study. Acute animal experiments were performed five times using five Japanese domestic pigs. To create thrombogenic conditions, fibrinogen coating that induces thrombus formation in a short time was applied to the inner surfaces of the pump. An inflow and an outflow cannula were inserted into the apex of the left ventricle and the carotid artery, respectively, by a minimally invasive surgical procedure that allowed minimal bleeding and hypothermia. Pump flow was maintained at 1 L/min without anticoagulation. The vibrational frequency of the impeller (70 Hz) and its vibrational amplitude (30 μm) were kept constant. The thrombus was detected based on the fact that the phase difference between the impeller displacement and input current to the magnetic bearing increases when a thrombus is formed inside a pump. The experiment was terminated when the phase difference increased by over 1° from the lowest value or when the phase difference was at the lowest value 12 hours after commencing measurements. The phase difference increased by over 1° in three cases. The pump was stopped after 12 hours in two cases. Pump thrombi were found in the pump in three cases in which the phase difference increased by over 1°. No pump thrombus was found in the other two cases in which the phase difference did not increase. We succeeded in real-time thrombus monitoring of a mag-lev pump in acute animal experiments.
Collapse
Affiliation(s)
- Haruna Seki
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tatsuki Fujiwara
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Wataru Hijikata
- School of Engineering, Tokyo Institute of Technology, Tokyo, Japan
| | - Tomotaka Murashige
- School of Engineering, Tokyo Institute of Technology, Tokyo, Japan.,Department of Advanced Surgical Technology Research and Development, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tomoki Tahara
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Sachie Yokota
- Faculty of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - Asato Ogata
- Faculty of Medicine, Tokyo Medical and Dental University, Tokyo, Japan
| | - Katsuhiro Ohuchi
- Department of Advanced Surgical Technology Research and Development, Tokyo Medical and Dental University, Tokyo, Japan
| | - Tomohiro Mizuno
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| | - Hirokuni Arai
- Department of Cardiovascular Surgery, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University, Tokyo, Japan
| |
Collapse
|
6
|
Tahara S, Tahara T, Horiguchi N, Yamada S, Urano M, Tsukamoto T, Kuroda M, Ohmiya N. PO-008 Accelerated DNA methylation in gastric mucosa adjacent to cancer after HELICOBACTER PYLORI eradication. ESMO Open 2018. [DOI: 10.1136/esmoopen-2018-eacr25.53] [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: 11/04/2022] Open
|
7
|
Kobayashi J, Tahara T, Matsuzaki Y, Ono Y, Matsumoto J, Sato H, Onko K, Kishimoto Y, Tanino T, Sakaguchi H, Uchida N. PO-0999: Control of rectal volume with Kampo formula during prostate radiotherapy: A prospective study. Radiother Oncol 2017. [DOI: 10.1016/s0167-8140(17)31435-4] [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: 11/30/2022]
|
8
|
Ikeda M, Shimizu S, Sato T, Morimoto M, Kojima Y, Inaba Y, Hagihara A, Kudo M, Nakamori S, Kaneko S, Sugimoto R, Tahara T, Ohmura T, Yasui K, Sato K, Ishii H, Furuse J, Okusaka T. Reply to the Letter to the editor 'Sorafenib plus hepatic arterial infusion chemotherapy with cisplatin versus Sorafenib for advanced hepatocellular carcinoma: randomized phase II trial' by Fornaro et al. Ann Oncol 2017; 28:903-904. [PMID: 28137738 DOI: 10.1093/annonc/mdx013] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2016] [Indexed: 11/12/2022] Open
Affiliation(s)
- M Ikeda
- Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital East, Kashiwa, Japan
| | - S Shimizu
- Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital East, Kashiwa, Japan
| | - T Sato
- Department of Biostatistics, Kyoto University School of Public Health, Kyoto, Japan
| | - M Morimoto
- Department of Hepatobiliary and Pancreatic Medical Oncology, Kanagawa Cancer Center, Yokohama, Japan
| | - Y Kojima
- Department of Gastroenterology, National Center for Global Health and Medicine Center Hospital, Tokyo, Japan
| | - Y Inaba
- Department of Diagnostic and Interventional Radiology, Aichi Cancer Center Hospital, Nagoya, Japan
| | - A Hagihara
- Department of Hepatology, Osaka City University Hospital, Osaka, Japan
| | - M Kudo
- Department of Gastroenterology and Hepatology, Kinki University School of Medicine, Osaka, Japan
| | - S Nakamori
- Department of Hepatobiliary and Pancreatic Surgery, Osaka National Hospital, Osaka, Japan
| | - S Kaneko
- Department of Gastroenterology, Kanazawa University Hospital, Kanazawa, Ishikawa, Japan
| | - R Sugimoto
- Department of Hepato-Biliary-Pancreatology, National Hospital Organization Kyushu Cancer Center, Fukuoka, Japan
| | - T Tahara
- Department of Gastroenterology, Saiseikai Utsunomiya Hospital, Tochigi, Japan
| | - T Ohmura
- Department of Gastroenterology, Sapporo Kosei General Hospital, Sapporo, Japan
| | - K Yasui
- Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto, Japan
| | - K Sato
- Institute for Advancement of Clinical and Translational Science, Kyoto University Hospital, Kyoto, Japan
| | - H Ishii
- Clinical Research Center, Shikoku Cancer Center, Matsuyama, Japan
| | - J Furuse
- Department of Medical Oncology, Kyorin University, Tokyo, Japan
| | - T Okusaka
- Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital, Tokyo, Japan
| |
Collapse
|
9
|
Fujiwara T, Sakota D, Ohuchi K, Endo S, Tahara T, Murashige T, Kosaka R, Oi K, Mizuno T, Maruyama O, Arai H. Optical Dynamic Analysis of Thrombus Inside a Centrifugal Blood Pump During Extracorporeal Mechanical Circulatory Support in a Porcine Model. Artif Organs 2017; 41:893-903. [DOI: 10.1111/aor.12862] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2016] [Revised: 07/07/2016] [Accepted: 08/19/2016] [Indexed: 12/25/2022]
Affiliation(s)
- Tatsuki Fujiwara
- Department of Cardiovascular Surgery; Tokyo Medical and Dental University Graduate School of Medical and Dental Sciences
| | - Daisuke Sakota
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
| | - Katsuhiro Ohuchi
- Department of Advanced Surgical Technology Research and Development; Tokyo Medical and Dental University
| | - Shu Endo
- Center for Experimental Animals, Tokyo Medical and Dental University
| | - Tomoki Tahara
- Faculty of Medicine; Tokyo Medical and Dental University
| | - Tomotaka Murashige
- Graduate School of Science and Technology; Tokyo University of Science; Ibaraki Japan
| | - Ryo Kosaka
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
| | - Keiji Oi
- Department of Cardiovascular Surgery; Tokyo Medical and Dental University Graduate School of Medical and Dental Sciences
| | - Tomohiro Mizuno
- Department of Cardiovascular Surgery; Tokyo Medical and Dental University Graduate School of Medical and Dental Sciences
| | - Osamu Maruyama
- Health Research Institute, National Institute of Advanced Industrial Science and Technology (AIST)
| | - Hirokuni Arai
- Department of Cardiovascular Surgery; Tokyo Medical and Dental University Graduate School of Medical and Dental Sciences
| |
Collapse
|
10
|
Ikeda M, Shimizu S, Sato T, Morimoto M, Kojima Y, Inaba Y, Hagihara A, Kudo M, Nakamori S, Kaneko S, Sugimoto R, Tahara T, Ohmura T, Yasui K, Sato K, Ishii H, Furuse J, Okusaka T. Sorafenib plus hepatic arterial infusion chemotherapy with cisplatin versus sorafenib for advanced hepatocellular carcinoma: randomized phase II trial. Ann Oncol 2016; 27:2090-2096. [PMID: 27573564 PMCID: PMC5091321 DOI: 10.1093/annonc/mdw323] [Citation(s) in RCA: 104] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2016] [Accepted: 08/04/2016] [Indexed: 12/13/2022] Open
Abstract
In a randomized phase II study of sorafenib plus hepatic arterial infusion chemotherapy with cisplatin in comparison with sorafenib alone in patients with advanced hepatocellular carcinoma, it yielded favorable overall survival when compared with sorafenib alone. This is the first report of its effectiveness in relation to the overall survival in comparison with that of sorafenib alone in patients with advanced hepatocellular carcinoma. Background Sorafenib (Sor) is acknowledged as a standard therapy for advanced hepatocellular carcinoma (HCC). This trial was conducted to evaluate the effect of addition of hepatic arterial infusion chemotherapy with cisplatin (SorCDDP) to Sor for the treatment of advanced HCC. Patients and methods We conducted a multicenter open-labeled randomized phase II trial in chemo-naïve patients with advanced HCC with Child-Pugh scores of 5–7. Eligible patients were randomly assigned 2:1 to receive SorCDDP (sorafenib: 400 mg bid; cisplatin: 65 mg/m2, day 1, every 4–6 weeks) or Sor (400 mg bid). The primary end point was overall survival. Results A total of 108 patients were randomized (Sor, n = 42; SorCDDP, n = 66). The median survival in the Sor and SorCDDP arms were 8.7 and 10.6 months, respectively [stratified hazard ratio (95% confidence interval), 0.60 (0.38–0.96), P = 0.031]. The median time to progression and the response rate were, respectively, 2.8 months and 7.3% in the Sor arm and 3.1 months and 21.7% in the SorCDDP arm. The adverse events were more frequent in the SorCDDP arm than in the Sor arm, but well-tolerated. Conclusion SorCDDP yielded favorable overall survival when compared with Sor in patients with advanced HCC. Clinical Trial registration UMIN-CTR (http://www.umin.ac.jp/ctr/index-j.htm), identification number: UMIN000005703.
Collapse
Affiliation(s)
- M Ikeda
- Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital East, Kashiwa
| | - S Shimizu
- Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital East, Kashiwa
| | - T Sato
- Department of Biostatistics, Kyoto University School of Public Health, Kyoto
| | - M Morimoto
- Department of Hepatobiliary and Pancreatic Medical Oncology, Kanagawa Cancer Center, Yokohama
| | - Y Kojima
- Department of Gastroenterology, National Center for Global Health and Medicine Center Hospital, Tokyo
| | - Y Inaba
- Department of Diagnostic and Interventional Radiology, Aichi Cancer Center Hospital, Nagoya
| | - A Hagihara
- Department of Hepatology, Osaka City University Hospital, Osaka
| | - M Kudo
- Department of Gastroenterology and Hepatology, Kinki University School of Medicine, Osaka
| | - S Nakamori
- Department of Hepatobiliary and Pancreatic Surgery, Osaka National Hospital, Osaka
| | - S Kaneko
- Department of Gastroenterology, Kanazawa University Hospital, Kanazawa
| | - R Sugimoto
- Department of Hepato-Biliary-Pancreatology, National Hospital Organization Kyushu Cancer Center, Fukuoka
| | - T Tahara
- Department of Gastroenterology, Saiseikai Utsunomiya Hospital, Tochigi
| | - T Ohmura
- Department of Gastroenterology, Sapporo Kosei General Hospital, Sapporo
| | - K Yasui
- Department of Molecular Gastroenterology and Hepatology, Kyoto Prefectural University of Medicine, Kyoto
| | - K Sato
- Institute for Advancement of Clinical and Translational Science, Kyoto University Hospital, Kyoto
| | - H Ishii
- Clinical Research Center, Shikoku Cancer Center, Matsuyama
| | - J Furuse
- Department of Medical Oncology, Kyorin University, Tokyo
| | - T Okusaka
- Department of Hepatobiliary and Pancreatic Oncology, National Cancer Center Hospital, Tokyo, Japan
| |
Collapse
|
11
|
Tahara T, Kanatani K, Yoshida K, Miura H, Sakamoto M, Oshimura M. Purification and Some Properties of Acidocin 8912, a Novel Bacteriocin Produced byLactobacillus acidophilusTK8912. Biosci Biotechnol Biochem 2014; 56:1212-5. [PMID: 1368836 DOI: 10.1271/bbb.56.1212] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Acidocin 8912, a bacteriocin produced by Lactobacillus acidophilus TK8912, was purified by ammonium sulfate fractionation and successive chromatographies on CM-cellulose, Sephadex G-50, Sephadex G-25, and reversed-phase HPLC on Aquapore RP-300. The purified acidocin 8912 migrated as a single band on SDS-PAGE. The molecular weight was estimated to be 5200 by SDS-PAGE, and 5400 by HPLC gel filtration on TSKgel G3000PWXL. Both the amino acid composition and the N-terminal amino acid sequence analysis indicated that acidocin 8912 was a peptide composed of presumably 50 amino acids containing a Lys residue at the N-terminus. The purified acidocin 8912 showed a bactericidal effect on sensitive cells but not a bacteriolytic effect.
Collapse
Affiliation(s)
- T Tahara
- Research Laboratory, Tamon Sake Brewing Co., Ltd., Hyogo, Japan
| | | | | | | | | | | |
Collapse
|
12
|
Tahara T, Shirahata S, Osada K, Tachibana H, Shinohara K, Murakami H. Stimulation of Interferon β Production of Cultured Cells by Phospholipids in Foodstuffs. Biosci Biotechnol Biochem 2014; 56:1465-6. [PMID: 1368953 DOI: 10.1271/bbb.56.1465] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- T Tahara
- Department of Food Science and Technology, Faculty of Agriculture, Kyushu University, Fukuoka, Japan
| | | | | | | | | | | |
Collapse
|
13
|
Tanaka Y, Ueyama H, Ogata M, Daikoku T, Morimoto M, Kitagawa A, Imajo Y, Tahara T, Inkyo M, Yamaguchi N, Nagata S. Evaluation of nanodispersion of iron oxides using various polymers. Indian J Pharm Sci 2014; 76:54-61. [PMID: 24799739 PMCID: PMC4007256] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2013] [Revised: 12/03/2013] [Accepted: 12/10/2013] [Indexed: 11/21/2022] Open
Abstract
In order to create Fe2O3 and Fe2O3·H2O nanoparticles, various polymers were used as dispersing agents, and the resulting effects on the dispersibility and nanoparticulation of the iron oxides were evaluated. It was revealed that not only the solution viscosity but also the molecular length of the polymers and the surface tension of the particles affected the dispersibility of Fe2O3 and Fe2O3·H2O particles. Using the dispersing agents 7.5% hydroxypropylcellulose-SSL, 6.0% Pharmacoat 603, 5.0% and 6.5% Pharmacoat 904 and 7.0% Metolose SM-4, Fe2O3 nanoparticles were successfully fabricated by wet milling using Ultra Apex Mill. Fe2O3·H2O nanoparticles could also be produced using 5.0% hydroxypropylcellulose-SSL and 4.0 and 7.0% Pharmacoat 904. The index for dispersibility developed in this study appears to be an effective indicator of success in fabricating nanoparticles of iron oxides by wet milling using Ultra Apex Mill.
Collapse
Affiliation(s)
- Y. Tanaka
- Laboratory of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Hiroshima International University, 5-1-1 Hiro-koshingai, Kure, Hiroshima 7370112, Japan
| | - H. Ueyama
- Laboratory of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Hiroshima International University, 5-1-1 Hiro-koshingai, Kure, Hiroshima 7370112, Japan
| | - M. Ogata
- Laboratory of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Hiroshima International University, 5-1-1 Hiro-koshingai, Kure, Hiroshima 7370112, Japan
| | - T. Daikoku
- Laboratory of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Hiroshima International University, 5-1-1 Hiro-koshingai, Kure, Hiroshima 7370112, Japan
| | - M. Morimoto
- Laboratory of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Hiroshima International University, 5-1-1 Hiro-koshingai, Kure, Hiroshima 7370112, Japan
| | - A. Kitagawa
- Kotobuki Industries Co., Ltd., Ohashi-Gyoen-Bldg. 2F, 1-8-1 Shinjuku, Shinjuku-ku, Tokyo 1600022, Japan
| | - Y. Imajo
- Kotobuki Industries Co., Ltd., Ohashi-Gyoen-Bldg. 2F, 1-8-1 Shinjuku, Shinjuku-ku, Tokyo 1600022, Japan
| | - T. Tahara
- Kotobuki Industries Co., Ltd., Ohashi-Gyoen-Bldg. 2F, 1-8-1 Shinjuku, Shinjuku-ku, Tokyo 1600022, Japan
| | - M. Inkyo
- Kotobuki Industries Co., Ltd., Ohashi-Gyoen-Bldg. 2F, 1-8-1 Shinjuku, Shinjuku-ku, Tokyo 1600022, Japan
| | - N. Yamaguchi
- Kishi Kasei Co., Ltd., 1-11-22 Fukuura, Kanazawa-ku, Yokohama, Kanagawa 2360004, Japan
| | - S. Nagata
- Laboratory of Pharmaceutical Technology, Faculty of Pharmaceutical Sciences, Hiroshima International University, 5-1-1 Hiro-koshingai, Kure, Hiroshima 7370112, Japan,Address for correspondence: E-mail:
| |
Collapse
|
14
|
Ito J, Kato R, Nozato T, Tahara T, Satoh Y. Relationship between preprocedual serum 1,5-anhydroglucitol concentrations and restenosis after implantation of drug-eluting stent. Eur Heart J 2013. [DOI: 10.1093/eurheartj/eht309.p4260] [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: 11/14/2022] Open
|
15
|
Nihonyanagi S, Singh PC, Yamaguchi S, Tahara T. Two-Dimensional Heterodyne-Detected VSFG Spectroscopy of Water Molecules at Charged Interfaces. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20134105022] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
16
|
Takeuchi S, Kuramochi H, Tahara T. Ultraviolet-resonance femtosecond stimulated Raman study of the initial events in photoreceptor chromophore. EPJ Web of Conferences 2013. [DOI: 10.1051/epjconf/20134108002] [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
|
17
|
Ohashi H, Morita H, Tahara T, Tsunakawa H, Matsumoto A, Ogami K, Kato T, Miyazaki H. Thrombopoietin stimulates proliferation and megakaryocytic differentiation of mouse pro-B cell line BF-TE22. Cytotechnology 2012; 26:199-206. [PMID: 22358617 DOI: 10.1023/a:1007915809529] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
We have isolated and characterized a thrombopoietin (TPO)-dependent BF-TE22 cell line endogenously expressing murine Mpl, which is a subclone of murine pro-B Ba/F3 cells. TPO stimulated the proliferation of BF-TE22 cells in a dose-dependent manner, and also induced the expression of megakaryocyte lineage-specific AP-51 and CD61 cell surface antigens. The results indicate that the murine Mpl on BF-TE22 cells can transmit both proliferation and megakaryocyte lineage-specific differentiation signals to cells. Furthermore, it was shown that IL-3 inhibits the TPO-induced differentiation signals of BF-TE22 cells. These results suggest that the signals mediated by IL-3 predominate over those of TPO in BF-TE22 cells. Thus, BF-TE22 cells will be useful for the biological and biochemical studies of the TPO-Mpl signal transduction mechanism.
Collapse
Affiliation(s)
- H Ohashi
- Pharmaceutical Research Laboratory, Kirin Brewery Co., Ltd, Miyahara 3, Takasaki, Gunma, 370, Japan
| | | | | | | | | | | | | | | |
Collapse
|
18
|
Shibata Y, Okano S, Shiroza T, Tahara T, Nakazawa K, Kataoka S, Ishida I, Kobayashi T, Yoshie H, Abiko Y. Characterization of human-type monoclonal antibodies against reduced form of hemin binding protein 35 from Porphyromonas gingivalis. J Periodontal Res 2011; 46:673-81. [PMID: 21644999 DOI: 10.1111/j.1600-0765.2011.01389.x] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
BACKGROUND AND OBJECTIVE The gram-negative anaerobe Porphyromonas gingivalis has been implicated as an important pathogen in the development of adult periodontitis, and its colonization of subgingival sites is critical in the pathogenic process. We previously identified a 35 kDa surface protein (hemin binding protein 35; HBP35) from P. gingivalis that exhibited coaggregation activity, while additional analysis suggested that this protein possessed an ability to bind heme molecules. For development of passive immunotherapy for periodontal diseases, human-type monoclonal antibodies have been prepared using HBP35 as an antigen in TransChromo mice. In the present study, we focused on a single antibody, TCmAb-h13, which is known to inhibit heme binding to recombinant HBP35. The aim of our investigation was to clarify the redox-related function of HBP35 and consider the benefits of human-type monoclonal antibodies. MATERIAL AND METHODS To examine the antigen recognition capability of TCmAbs with immunoblotting and Biacore techniques, we used the native form as well as several Cys-to-Ser variants of recombinant HBP35. RESULTS We found that the redox state of recombinant HBP35 was dependent on two Cys residues, (48) C and (51) C, in the thioredoxin active center (WCGxCx). Furthermore, TCmAb-h13 recognized the reduced forms of recombinant HBP35, indicating its inhibitory effect on P. gingivalis growth. CONCLUSION Hemin binding protein 35 appears to be an important molecule involved in recognition of the redox state of environmental conditions. In addition, TCmAb-h13 had an inhibitory effect on heme binding to recombinant HBP35, thereby interfering with P. gingivalis growth.
Collapse
Affiliation(s)
- Y Shibata
- Department of Biochemistry and Molecular Biology, Nihon University School of Dentistry at Matsudo, Chiba, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
19
|
Pham QH, Von Lueder TG, Namtvedt SK, Rosjo H, Omland T, Steine K, Timoteo AT, Mota Carmo M, Simoes M, Branco LM, Ferreira RC, Kato R, Ito J, Tahara T, Yokoyama Y, Ashikaga T, Satoh Y, Na JO, Hong HE, Kim MN, Shin SY, Choi CU, Kim EJ, Rha SW, Park CG, Seo HS, Oh DJ, Ticulescu R, Brigido S, Vriz O, Sparacino L, Popescu BA, Ginghina C, Carerj S, Nicolosi GL, Antonini-Canterin F, Onaindia Gandarias JJ, Romero A, Laraudogoitia E, Velasco S, Quintana O, Cacicedo A, Rodriguez I, Alarcon JA, Gonzalez J, Lekuona I, Onaindia Gandarias JJ, Laraudogoitia E, Romero A, Velasco S, Cacicedo A, Quintana O, Subinas A, Gonzalez J, Alarcon JA, Lekuona I, Abdula G, Lund LH, Winter R, Brodin L, Sahlen A, Masaki M, Cha YM, Yuasa T, Dong K, Dong YX, Mankad SV, Oh JK, Vallet F, Lequeux B, Diakov C, Sosner P, Christiaens L, Coisne D, Kihara C, Murata K, Wada Y, Uchida K, Ueyama T, Okuda S, Susa T, Matsuzaki M, Cho EJ, Choi KY, Kwon BJ, Kim DB, Jang SW, Cho JS, Jung HO, Jeon HK, Youn HJ, Kim JH, Cikes M, Bijnens B, Velagic V, Kopjar T, Milicic D, Biocina B, Gasparovic H, Almuntaser I, Brown A, Foley B, Mulvihill N, Crean P, King G, Murphy R, Takata Y, Taniguchi M, Nobusada S, Sugawara M, Toh N, Kusano K, Itoh H, Wellnhofer E, Kriatselis C, Nedios S, Gerds-Li JH, Fleck E, Poulsen MK, Henriksen JE, Dahl J, Johansen A, Haghfelt T, Hoilund-Carlsen PF, Beck-Nielsen H, Moller JE, Dankowski R, Wierzchowiecki M, Michalski M, Nowicka A, Szymanowska K, Pajak A, Poprawski K, Szyszka A, Kasner M, Westermann D, Schultheiss HP, Tschoepe C, Watanabe T, Iwai-Takano M, Kobayashi A, Machii H, Takeishi Y, Paelinck BP, Van Herck PL, Bosmans JM, Vrints CJ, Lamb HJ, Doltra A, Vidal B, Silva E, Poyatos S, Mont L, Berruezo A, Castel A, Tolosana JM, Brugada J, Sitges M, Dencker M, Bjorgell O, Hlebowicz J, Szelenyi ZS, Szenasi G, Kiss M, Prohaszka Z, Patocs A, Karadi I, Vereckei A, Saha SK, Anderson PL, Govind S, Govindan M, Moggridge JC, Kiotsekoglou A, Gopal AS, Loegstrup BB, Christophersen TB, Hoefsten DE, Moeller JE, Boetker HE, Egstrup K, Wellnhofer E, Kriatselis C, Nedios S, Gerds-Li JH, Fleck E, Graefe M, Huang FQ, Zhang RS, Le TT, Tan RS, Sattarzadeh Badkoubeh R, Tavoosi A, Elahian AR, Drapkina O, Ivashkin VI, Vereckei A, Szelenyi ZS, Fazakas A, Pepo L, Janosi O, Karadi I, Kopitovic I, Goncalves A, Marcos-Alberca P, Almeria C, Feltes G, Rodriguez E, Garcia E, Hernandez-Antolin R, Macaya C, Silva Cardoso J, Zamorano JL, Navarro MS, Valentin M, Banes CM, Rigo F, Grolla E, Tona F, Cuaia V, Moreo A, Badano L, Raviele A, Iliceto S, Tarzia P, Sestito A, Nerla R, Di Monaco A, Infusino F, Matera D, Greco F, Tacchino RM, Lanza GA, Crea F, Nemes A, Balazs E, Pinter KS, Egyed A, Csanady M, Forster T, Loegstrup BB, Christophersen TB, Hoefsten DE, Moeller JE, Boetker HE, Egstrup K, Holte E, Vegsundvag J, Hole T, Hegbom K, Wiseth R, Nemes A, Balazs E, Pinter KS, Egyed A, Csanady M, Forster T, Sharif D, Sharif-Rasslan A, Shahla C, Khalil A, Rosenschein U, Zagatina A, Zhuravskaya N, Tyurina TV, Tagliamonte E, Cirillo T, Coppola A, Marinelli U, Romano C, Riccio G, Citro R, Astarita C, Capuano N, Tagliamonte E, Cirillo T, Marinelli U, Quaranta G, Desiderio A, Riccio G, Romano C, Capuano N, Frattini S, Faggiano P, Zilioli V, Locantore E, Longhi S, Bellandi F, Faden G, Triggiani M, Dei Cas L, Dalsgaard M, Kjaergaard J, Iversen K, Hassager C, Dinh W, Nickl WN, Smettan JS, Koehler TK, Scheffold TD, Coll Barroso MCB, Guelker JG, Fueth RF, Kamperidis V, Hadjimiltiades S, Sianos G, Efthimiadis G, Karvounis H, Parcharidis G, Styliadis IH, Velasco Del Castillo MS, Cacicedo A, Onaindia JJ, Quintana O, Alarcon JA, Rodriguez I, Telleria M, Subinas A, Lekuona I, Laraudogoitia E, Carstensen HG, Nordenberg C, Sogaard P, Fritz-Hansen T, Bech J, Galatius S, Jensen JS, Mogelvang R, Bartko PE, Graf S, Rosenhek R, Burwash IG, Bergler-Klein J, Clavel MA, Baumgartner H, Pibarot P, Mundigler G, Kirilmaz B, Eser I, Tuzun N, Komur B, Dogan H, Taskiran Comez A, Ercan E, Cusma-Piccione M, Zito C, Oreto G, Piluso S, Tripepi S, Oreto L, Longordo C, Ciraci L, Di Bella G, Carerj S, Piatkowski R, Kochanowski J, Scislo P, Grabowski M, Marchel M, Roik M, Kosior D, Opolski G, Sknouril L, Dorda M, Holek B, Gajdusek L, Chovancik J, Branny M, Fiala M, Szymanski P, Lipczynska M, Klisiewicz A, Hoffman P, Jander N, Minners J, Martin G, Zeh W, Allgeier M, Gohlke-Baewolf C, Gohlke H, Nistri S, Porciani MC, Attanasio M, Abbate R, Gensini GF, Pepe G, Duncan RF, Piantadosi C, Nelson AJ, Wittert G, Dundon B, Worthley MI, Worthley SG, Jung P, Berlinger K, Rieber J, Sohn HZ, Schneider P, Leibig M, Koenig A, Klauss V, Tomkiewicz-Pajak L, Kolcz J, Olszowska M, Pieculewicz M, Podolec P, Pieculewicz M, Przewlocki T, Tomkiewicz-Pajak L, Suchon E, Sobien B, Podolec P, Pieculewicz M, Przewlocki T, Wilkolek P, Tomkiewicz-Pajak L, Ziembicka A, Podolec P, Pieculewicz M, Przewlocki T, Tomkiewicz-Pajak L, Hlawaty M, Wilkolek P, Sobien B, Suchon E, Podolec P, Van De Bruaene A, Hermans H, Buys R, Vanhees L, Delcroix M, Voigt JU, Budts W, De Cillis E, Acquaviva T, Basile D, Bortone AS, Kalimanovska-Ostric D, Nastasovic T, Vujisic-Tesic B, Jovanovic I, Milakovic B, Dostanic M, Stosic M, Frogoudaki A, Andreou K, Parisis J, Triantafyllidi E, Gaitani S, Paraskevaidis J, Anastasiou-Nana M, Pieculewicz M, Przewlocki T, Tomkiewicz-Pajak L, Sobien B, Hlawaty M, Podolec P, De Pasquale G, Kuehn A, Petzuch K, Mueller J, Meierhofer C, Fratz S, Hager A, Hess J, Vogt M, Attenhofer Jost CH, Dearani JA, Scott CG, Burkhart HM, Connolly HM, Vitarelli A, Battaglia D, Caranci F, Padella V, Continanza G, Dettori O, Capotosto L, Vitarelli M, De Cicco V, Cortez Morichetti M, Mohanan Nair KK, Sasidaharan B, Thajudeen A, Tharakan JM, Mertens L, Ahmad N, Kantor PK, Grosse-Wortmann L, Friedberg MK, Bernard YF, Morel MA, Descotes-Genon V, Jehl J, Meneveau N, Schiele F, Kaldararova M, Simkova I, Tittel P, Masura J, Trojnarska O, Szczepaniak L, Mizia -Stec K, Cieplucha A, Bartczak A, Grajek S, Tykarski A, Gasior Z, Attenhofer Jost CH, Babovicvuksanovic D, Scott CG, Bonnichsen CR, Burkhart HM, Connolly HM, Morgan GJ, Slorach C, Hui W, Sarkola T, Lee KJ, Chaturvedi R, Benson L, Mertens L, Bradley T, Iancu ME, Ghiorghiu I, Serban M, Craciunescu I, Hodo A, Popescu BA, Ginghina C, Morgan J, Morgan GJ, Slorach C, Hui W, Roche L, Lee K, Chaturvedi R, Benson L, Bradley T, Mertens L, Morgan J, Morgan GJ, Slorach C, Hui W, Sarkola T, Lee K, Chaturvedi R, Benson L, Bradley T, Mertens L, Milanesi O, Favero V, Padalino M, Biffanti R, Cerutti A, Maschietto N, Reffo E, Vida V, Stellin G, Irtyuga O, Gamazin D, Voronkina I, Tsoyi N, Gudkova E, Moiseeva O, Aggeli C, Kazazaki C, Felekos I, Lagoudakou S, Roussakis G, Skoumas J, Pitsavos C, Stefanadis C, Cueff C, Keenan N, Steg PG, Cimadevilla C, Ducrocq G, Vahanian A, Messika-Zeitoun D, Petrella L, Mazzola AM, Villani CV, Giancola RG, Ciocca MC, Di Eusanio DEM, Nolan S, Ionescu A, Skaug TR, Amundsen BH, Hergum T, Torp H, Haugen BO, Lopez Aguilera J, Mesa Rubio D, Ruiz Ortiz M, Delgado Ortega M, Villanueva Fernandez E, Cejudo Diaz Del Campo L, Toledano Delgado F, Leon Del Pino M, Romo Pena E, Suarez De Lezo Cruz-Conde J, De Marco E, Colucci A, Comerci G, Gabrielli FA, Natali R, Garramone B, Savino M, Lotrionte M, Sonaglioni A, Loperfido F, Zdravkovic M, Perunicic J, Krotin M, Ristic M, Vukomanovic V, Zaja M, Radovanovic S, Saric J, Zdravkovic D, Cotrim C, Almeida AR, Miranda R, Almeida AG, Picano E, Carrageta M, D'andrea A, Cocchia R, Riegler L, Golia E, Scarafile R, Citro R, Caso P, Russo MG, Bossone E, Calabro' R, Noman H, Adel A, Elfaramawy AMR, Abdelraouf M, Elnaggar WAEL, Baligh E, Sargento L, Silva D, Goncalves S, Ribeiro S, Vinhas Sousa G, Almeida A, Lopes M, Rodriguez-Manero M, Aguado Gil L, Azcarate P, Lloret Luna P, Macias Gallego A, Castano SARA, Garcia M, Pujol Salvador C, Barba J, Redondo P, Tomasoni L, Sitia S, Atzeni F, Gianturco L, Ricci C, Sarzi-Puttini P, Turiel M, Sitia S, Tomasoni L, Atzeni F, De Gennaro Colonna V, Sarzi-Puttini P, Turiel M, Uejima T, Jaroch J, Antonini-Canterin F, Polombo C, Carerj S, Hughes A, Vinereanu D, Evanvelista A, Leftheriotis G, Fraser AG, Lewczuk A, Sobkowicz B, Tomaszuk-Kazberuk A, Sawicki R, Hirnle T, Michalski BW, Filipiak D, Kasprzak JD, Lipiec P, Dalen H, Haugen BO, Mjolstad OC, Klykken BE, Graven T, Martensson M, Olsson M, Brodin LA, Antonini-Canterin F, Ticulescu R, Vriz O, Enache R, Leiballi E, Popescu BA, Ginghina C, Nicolosi GL, Penhall A, Perry R, Altman M, Sinhal A, Bennetts J, Chew DP, Joseph MX, Larsen LH, Kjaergaard J, Kristensen T, Kober LV, Kofoed KF, Hassager C, Moscoso Costa F, Ribeiras R, Brito J, Boshoff S, Neves J, Teles R, Canada M, Andrade MJ, Gouveia R, Silva A, Miskovic A, Poerner TP, Stiller CS, Goebel BG, Moritz AM, Stefani L, Galanti GG, Moraldo M, Bergamini C, Pabari PA, Dhutia NM, Malaweera ASN, Willson K, Davies J, Hughes AD, Xu XY, Francis DP, Jasaityte R, Amundsen B, Barbosa D, Loeckx D, Kiss G, Orderud F, Robesyn V, Claus P, Torp H, D'hooge J, Kihara C, Murata K, Wada Y, Uchida K, Nao T, Okuda S, Susa T, Miura T, Matsuzaki M, Shams K, Samir S, Samir R, El-Sayed M, Anwar AM, Nosir Y, Galal A, Chamsi-Pasha H, Ciobanu A, Dulgheru R, Bennett S, Vinereanu D, De Luca A, Toncelli L, Cappelli F, Stefani L, Cappelli B, Vono MCR, Galanti G, Zorman Y, Yilmazer MS, Akyildiz M, Gurol T, Aydin A, Dagdeviren B, Kalangos A. Poster session V * Saturday 11 December 2010, 08:30-12:30. European Journal of Echocardiography 2010. [DOI: 10.1093/ejechocard/jeq148] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
|
20
|
Fujii S, Kiyokawa T, Tsukihara S, Senda T, Tahara T, Kaminou T, Ogawa T. Magnetic resonance imaging findings of ovarian stromal hyperthecosis. Acta Radiol 2009; 50:954-7. [PMID: 19863423 DOI: 10.1080/02841850903207188] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Abstract
Ovarian stromal hyperthecosis is characterized by diffuse distribution of luteinized stromal cells accompanied by varying degrees of stromal hyperplasia. We report a case of ovarian stromal hyperthecosis with particular regard to magnetic resonance (MR)-pathologic correlation. At initial MR imaging, the central areas of the bilateral ovarian masses showed hypointensity on T1-weighted images and hyperintensity on T2-weighted images, while the peripheries of the bilateral masses showed isointensity to myometrium on T1-weighted images and heterogeneous signal intensities on T2-weighted images. At 15 days after the initial MR imaging examination, a second MR imaging demonstrated shrinkage of the bilateral ovarian masses. Change in the peripheries to predominantly isointensity to myometrium on the T2-weighted images was also observed. The patient underwent bilateral oophorectomy. Microscopic examination revealed scattered nests of lutein cells on a background of densely proliferated ovarian stroma with minimal collagen production in both ovaries. Edema was occasionally seen in the outer portion but was marked in the central zone of the ovaries, particularly on the left. The final pathologic diagnosis was stromal hyperthecosis. With regard to MR-pathologic correlation, the MR findings in the peripheries of the bilateral masses (isointensity relative to myometrium on both T1- and T2-weighted imaging) showed the characteristics of stromal hyperthecosis.
Collapse
Affiliation(s)
- S. Fujii
- Division of Radiology, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University, Yonago, Japan
| | - T. Kiyokawa
- Department of Pathology, Jikei University School of Medicine, Tokyo, Japan
| | - S. Tsukihara
- Department of Obstetrics and Gynecology, Faculty of Medicine, Tottori University, Yonago, Japan
| | - T. Senda
- Department of Radiology, Tottori Pref. Kousei Hospital, Kurayoshi, Japan
| | - T. Tahara
- Division of Radiology, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University, Yonago, Japan
- Department of Radiology, Tottori Pref. Kousei Hospital, Kurayoshi, Japan
| | - T. Kaminou
- Division of Radiology, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University, Yonago, Japan
| | - T. Ogawa
- Division of Radiology, Department of Pathophysiological and Therapeutic Science, Faculty of Medicine, Tottori University, Yonago, Japan
| |
Collapse
|
21
|
Tahara T, Shibata T, Nakamura M, Yoshioka D, Arisawa T, Hirata I. Light blue crest sign, a favorable marker for predicting the severity of gastric atrophy in the entire stomach. Endoscopy 2008; 40:880; author reply 881. [PMID: 18828092 DOI: 10.1055/s-2008-1077582] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
|
22
|
Matsugaki N, Yamada Y, Hiraki M, Igarashi N, Yamamoto S, Tsuchiya K, Shioya T, Maezawa H, Asaoka S, Miyauchi H, Tahara T, Tanimoto Y, Wakatsuki S. A new macromolecular crystallography beamline for softer X-ray at the Photon Factory. Acta Crystallogr A 2008. [DOI: 10.1107/s0108767308094415] [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: 11/10/2022] Open
|
23
|
|
24
|
Tahara T, Arisawa T, Shibata T, Hirata I, Nakano H. Association of polymorphism of TLR4 and CD14 genes with gastroduodenal diseases in Japan. Inflammopharmacology 2007; 15:124-8. [DOI: 10.1007/s10787-006-1567-8] [Citation(s) in RCA: 12] [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] [Indexed: 11/25/2022]
|
25
|
Mori E, Thomas M, Motoki K, Nakazawa K, Tahara T, Tomizuka K, Ishida I, Kataoka S. Human normal hepatocytes are susceptible to apoptosis signal mediated by both TRAIL-R1 and TRAIL-R2. Cell Death Differ 2003; 11:203-7. [PMID: 14576771 DOI: 10.1038/sj.cdd.4401331] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.0] [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: 11/09/2022] Open
Abstract
Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) triggers apoptosis in tumor cells without toxicity to normal cells, but some recombinant versions of TRAIL caused hepatocyte death. We generated fully human monoclonal antibodies (mAbs) that bind specifically to TRAIL receptor 1 (TRAIL-R1) and TRAIL receptor 2 (TRAIL-R2), which mediate apoptosis signal when they ligate with TRAIL, to investigate the contribution of each receptor to induce tumor cell apoptosis and hepatocyte toxicity. All of mAbs to TRAIL-R1 and TRAIL-R2 induced cell death in several cancer cell lines susceptible to TRAIL but not in human umbilical vein endothelial cells in vitro. Both anti-TRAIL-R1 mAbs and anti-TRAIL-R2mAbs also caused cell death in hepatocytes. However, a subset of mAbs to TRAIL-R2, which was characterized by the TRAIL blocking activity, did not show strong hepatocyte toxicity. These results indicate that human normal hepatocytes are susceptible to both TRAIL-R1- and TRAIL-R2-mediated apoptosis signal. Cell Death and Differentiation (2004) 11, 203-207. doi:10.1038/sj.cdd.4401331 Published online 24 October 2003
Collapse
Affiliation(s)
- E Mori
- Pharmaceutical Research Laboratories, Kirin Brewery Co. Ltd., 3 Miyahara, Takasaki, Gunma 370-1295, Japan
| | | | | | | | | | | | | | | |
Collapse
|
26
|
Tahara T, Takase B, Yamagishi T, Takayama E, Miyazaki K, Arakawa K, Satomura K, Yoshizu H, Shimazaki H, Tamai S, Kurita A, Ohsuzu F. A case report on primary cardiac non-Hodgkin's lymphoma: an approach by magnetic resonance and thallium-201 imaging. J Cardiovasc Magn Reson 2001; 1:163-7. [PMID: 11550350 DOI: 10.3109/10976649909080846] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- T Tahara
- Department of Internal Medicine-1, National Defense Medical College, Tokorozawa City, Saitama, Japan
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
27
|
Affiliation(s)
- X Gao
- Department of Pediatrics, Hyogo College of Medicine, Nishinomiya, Hyogo, Japan.
| | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Nishikawa M, Tahara T, Hinohara A, Miyajima A, Nakahata T, Shimosaka A. Role of the microenvironment of the embryonic aorta-gonad-mesonephros region in hematopoiesis. Ann N Y Acad Sci 2001; 938:109-16. [PMID: 11458497 DOI: 10.1111/j.1749-6632.2001.tb03579.x] [Citation(s) in RCA: 22] [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: 11/28/2022]
Abstract
Although various cytokines, growth factors, and chemokines are known to regulate hematopoiesis, expansion of hematopoietic stem cells (HSCs) in vitro with the use of such agents has proved problematic. Stromal cells are major components of the microenvironment that surrounds hematopoietic cells and are thought to play an important role in hematopoiesis in vivo. Co-culture of HSCs with stromal cells promotes hematopoiesis and self-renewal of HSCs. Definitive hematopoietic cells first appear during mammalian embryonic development in the aorta-gonad-mesonephros (AGM) region, and it is therefore thought that the microenvironment of this region plays an important role in HSC ontogeny. We have adopted two approaches to studying the contribution of the AGM microenvironment to hematopoiesis. In the first approach, we have developed an in vitro culture system for mouse AGM explants. Hematopoiesis is enhanced in such cultures by the presence of the combination of stem cell factor (SCF), basic fibroblast growth factor, leukemia inhibitory factor, and oncostatin M (SFLO culture). However, transplantation assays revealed that HSCs capable of long-term reconstitution of the hematopoietic compartment of irradiated mice (LTR-HSCs) do not expand in AGM-SFLO cultures; rather, these cultures appear to provide a favorable microenvironment for hematogenic angioblasts that are precursors of both endothelial and hematopoietic cells. In our second approach, we have established various stromal cell lines from the mouse AGM region. The AGM-S3 cell line supports human and mouse primitive hematopoietic cells as well as mouse LTR-HSCs. Maintenance of LTR-HSCs is mediated by a mechanism other than SCF signaling through its receptor (c-Kit). These two in vitro approaches should prove useful for further elucidation of the mechanisms that underlie hematopoiesis and HSC self-renewal.
Collapse
Affiliation(s)
- M Nishikawa
- Pharmaceutical Research Laboratory, Pharmaceutical Division, Kirin Brewery Co., Ltd., 3 Miyahara, Takasaki-shi, Gunma 370-1202, Japan.
| | | | | | | | | | | |
Collapse
|
29
|
Abstract
Thrombopoietin (TPO), the c-Mpl ligand, is produced constitutively in liver and other organs, circulates in the bloodstream, and is delivered to bone marrow, where it stimulates the early development of multiple hematopoietic lineages and megakaryocytopoiesis. The concentration of TPO in blood is regulated by c-Mpl mass on platelets and megakaryocytes. In addition to regulation by the number of TPO molecules, including the possible modulation of TPO mRNA abundance in bone marrow, megakaryocytopoiesis and platelet production may be regulated as a result of modulation of TPO activity by proteolytic processing that generates truncated forms of the molecule. Characterization of TPO partially purified from human plasma, however, revealed that the full-length molecule was the predominant form in the blood of both normal individuals and thrombocytopenic patients, although small amounts of truncated species were detected. Thus, truncation of TPO, at least that in the circulation examined, does not appear to contribute to the direct regulation of platelet production in response to increased demand. Given that native TPO isolated from the plasma of thrombocytopenic animals comprises truncated forms, the truncation of TPO is likely of physiological importance in the life history of this molecule.
Collapse
Affiliation(s)
- T Kato
- Pharmaceutical Research Laboratory, Kirin Brewery Co., Ltd., Takasaki, Gunma, Japan
| | | | | | | | | | | |
Collapse
|
30
|
Abstract
Complementary DNAs encoding a previously unidentified mouse Notch ligand and its human ortholog were isolated. The new Notch ligand contains a signal sequence, a DSL domain, eight epidermal growth factor-like repeats, a transmembrane domain, and an intracellular region, all of which are characteristics of members of the Delta protein family. The new protein was therefore designated Delta-4. Several previously unidentified sequences in both the extracellular and intracellular regions were shown to be conserved among vertebrate Delta proteins. The tissue distribution of Delta-4 mRNA resembles that previously described for Notch-4 (Int-3) transcripts. However, in situ hybridization with mouse lung revealed that Delta-4 mRNA is abundant in squamous alveolar cells that neighbor endothelial cells; Notch-4 expression is largely restricted to the latter cell type. Soluble forms of the extracellular portion of Delta-4 inhibit the apparent proliferation of human aortic endothelial cells, but not human pulmonary arterial endothelial cells.
Collapse
MESH Headings
- Adaptor Proteins, Signal Transducing
- Amino Acid Sequence
- Animals
- Blood Proteins/chemistry
- Blood Proteins/classification
- Blood Proteins/genetics
- Blood Proteins/pharmacology
- Calcium-Binding Proteins
- Cell Division/drug effects
- Cloning, Molecular
- DNA, Complementary/analysis
- Endothelium/cytology
- Endothelium/drug effects
- Endothelium, Vascular/cytology
- Endothelium, Vascular/drug effects
- Growth Substances/chemistry
- Growth Substances/classification
- Growth Substances/genetics
- Growth Substances/pharmacology
- Humans
- In Situ Hybridization
- Intercellular Signaling Peptides and Proteins
- Mice
- Molecular Sequence Data
- Phylogeny
- Proto-Oncogene Proteins/chemistry
- Receptor, Notch4
- Receptors, Cell Surface
- Receptors, Notch
- Sequence Analysis, Protein
- Sequence Homology, Amino Acid
- Solubility
Collapse
Affiliation(s)
- T Yoneya
- Pharmaceutical Research Laboratory, Kirin Brewery Co. Ltd., Miyahara, Takasaki, Gunma 370-1295, Japan
| | | | | | | | | | | | | | | |
Collapse
|
31
|
Kawasaki H, Nakano T, Kohdera U, Tahara T, Kato T, Kobayashi Y. Serum thrombopoietin concentration and peripheral platelet counts in essential thrombocythemia. Ann Hematol 2001; 80:62-3. [PMID: 11233780 DOI: 10.1007/s002770000221] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
32
|
Abstract
Radiation therapy is a powerful method for the control of cancer. The utilization of abdominal or pelvic radiation has been extended, and the incidence of radiation enteritis appears to be increasing. The majority of the induced lesions is in the distal ileum, sigmoid colon, or rectum. Reported here is an unusual case of radiation enteritis which caused a severe sequelae of stricture in the transverse colon as a long-term effect of therapeutic irradiation for uterine cancer, and required a surgical resection.
Collapse
MESH Headings
- Abdominal Pain/etiology
- Anastomosis, Surgical
- Anti-Inflammatory Agents, Non-Steroidal/therapeutic use
- Colitis, Ulcerative/drug therapy
- Colitis, Ulcerative/etiology
- Colitis, Ulcerative/surgery
- Combined Modality Therapy
- Constriction, Pathologic/drug therapy
- Constriction, Pathologic/etiology
- Constriction, Pathologic/surgery
- Female
- Fever/etiology
- Gastrointestinal Hemorrhage/etiology
- Humans
- Hysterectomy
- Melena/etiology
- Middle Aged
- Ovariectomy
- Postoperative Complications/etiology
- Radiation Injuries/drug therapy
- Radiation Injuries/etiology
- Radiation Injuries/surgery
- Radiation Pneumonitis/etiology
- Radiotherapy, Adjuvant/adverse effects
- Radiotherapy, High-Energy/adverse effects
- Sulfasalazine/therapeutic use
- Uterine Cervical Neoplasms/radiotherapy
- Uterine Cervical Neoplasms/surgery
Collapse
Affiliation(s)
- K Yoshimura
- Department of Internal Medicine, Kodama Hospital, Takarazuka, Hyogo
| | | | | | | | | |
Collapse
|
33
|
Muto T, Feese MD, Shimada Y, Kudou Y, Okamoto T, Ozawa T, Tahara T, Ohashi H, Ogami K, Kato T, Miyazaki H, Kuroki R. Functional analysis of the C-terminal region of recombinant human thrombopoietin. C-terminal region of thrombopoietin is a "shuttle" peptide to help secretion. J Biol Chem 2000; 275:12090-4. [PMID: 10766842 DOI: 10.1074/jbc.275.16.12090] [Citation(s) in RCA: 25] [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: 11/06/2022] Open
Abstract
Thrombopoietin (TPO) is a cytokine that primarily stimulates megakaryocytopoiesis and thrombopoiesis. TPO has a unique C-terminal tail peptide of about 160 amino acids that consists mostly of hydrophilic residues and contains six N-linked sugar chains. In order to investigate the biological function of the C-terminal domain, two series of mutations were performed. One is systematic truncation from the C terminus. Another is elimination of N-glycosylation sites in the C-terminal domain by Asn to Gln mutations. After the mutant proteins were expressed by mammalian cells, it was found that the elimination of the N-linked sugar sites did not affect the biological activity, whereas truncation of the C-terminal domain resulted in elevation of in vitro activity up to 4-fold. The C-terminal peptide itself was found to inhibit the in vitro activity. Moreover, both the C-terminal truncation and the elimination of the N-glycosylation sites decreased the secretion level progressively down to (1)/(10) that of wild type, and the amount of the mutant left in the cell increased. The N-glycosylation in the C-terminal region was found to be important for secretion of TPO. Among six N-glycosylation sites in the C-terminal region, two locations, Asn-213 and Asn-234, were found to be critical for secretion, and two other locations, Asn-319 and Asn-327, did not affect the secretion.
Collapse
Affiliation(s)
- T Muto
- Central Laboratories for Key Technology, Kirin Brewery Co., Ltd., 1-13-5 Fukuura, Kanazawa-ku, Yokohama, Kanagawa 236, Japan
| | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
34
|
Tomita N, Motomura S, Sakai R, Fujimaki K, Tanabe J, Fukawa H, Harano H, Kanamori H, Ogawa K, Mohri H, Maruta A, Kodama F, Ishigatsubo Y, Tahara T, Kato T. Strong inverse correlation between serum TPO level and platelet count in essential thrombocythemia. Am J Hematol 2000. [PMID: 10679802 DOI: 10.1002/(sici)1096-8652(200003)63:3<131::aid-ajh4>3.0.co;2-#] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Serum thrombopoietin (TPO) levels in 50 essential thrombocythemia (ET) patients were measured using a highly sensitive sandwich ELISA. In nine cases, TPO levels were measured at two points with different platelet counts. ET patients showed significantly higher serum TPO levels (n = 59, 2.70 +/- 2.74 fmol/mL, P < 0.0001) than those of normal individuals (n = 29, 0.83 +/- 0.36 fmol/mL). Twenty-three previously untreated ET patients also showed significantly higher serum TPO levels (1.33 +/- 0.75 fmol/mL, P = 0.0066) than normal individuals. Extremely high serum TPO levels (5.46 +/- 3.68 fmol/mL) were observed in ET patients with normal platelet counts. Furthermore, a strong inverse correlation was found between serum TPO levels and platelet counts in ET patients (R = -0.729, P < 0. 0001). This inverse correlation also held for each of nine cases with two-point TPO measurements. In the clinical course of ET, megakaryocyte mass may parallel the platelet mass before and after chemotherapy. Although it is unknown whether overproduction of TPO exists or not in ET, total platelet and megakaryocyte mass, i.e., the total number of c-Mpl, may play a role to regulate serum TPO levels.
Collapse
Affiliation(s)
- N Tomita
- First Department of Internal Medicine, Urafune Hospital, Yokohama, Kanagawa, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
35
|
Tomita N, Motomura S, Sakai R, Fujimaki K, Tanabe J, Fukawa H, Harano H, Kanamori H, Ogawa K, Mohri H, Maruta A, Kodama F, Ishigatsubo Y, Tahara T, Kato T. Strong inverse correlation between serum TPO level and platelet count in essential thrombocythemia. Am J Hematol 2000; 63:131-5. [PMID: 10679802 DOI: 10.1002/(sici)1096-8652(200003)63:3<131::aid-ajh4>3.0.co;2-#] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Serum thrombopoietin (TPO) levels in 50 essential thrombocythemia (ET) patients were measured using a highly sensitive sandwich ELISA. In nine cases, TPO levels were measured at two points with different platelet counts. ET patients showed significantly higher serum TPO levels (n = 59, 2.70 +/- 2.74 fmol/mL, P < 0.0001) than those of normal individuals (n = 29, 0.83 +/- 0.36 fmol/mL). Twenty-three previously untreated ET patients also showed significantly higher serum TPO levels (1.33 +/- 0.75 fmol/mL, P = 0.0066) than normal individuals. Extremely high serum TPO levels (5.46 +/- 3.68 fmol/mL) were observed in ET patients with normal platelet counts. Furthermore, a strong inverse correlation was found between serum TPO levels and platelet counts in ET patients (R = -0.729, P < 0. 0001). This inverse correlation also held for each of nine cases with two-point TPO measurements. In the clinical course of ET, megakaryocyte mass may parallel the platelet mass before and after chemotherapy. Although it is unknown whether overproduction of TPO exists or not in ET, total platelet and megakaryocyte mass, i.e., the total number of c-Mpl, may play a role to regulate serum TPO levels.
Collapse
Affiliation(s)
- N Tomita
- First Department of Internal Medicine, Urafune Hospital, Yokohama, Kanagawa, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
36
|
Ashida K, Arakawa K, Yamagishi T, Tahara T, Ayaori M, Miyazaki K, Shibuya T, Hatori N, Yoshizu H, Tanaka T, Ohsuzu F. A case of aortic dissection with transient ST-segment elevation due to functional left main coronary artery obstruction. Jpn Circ J 2000; 64:130-4. [PMID: 10716527 DOI: 10.1253/jcj.64.130] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
A 48-year-old man with a history of hypertension and diabetes mellitus was hospitalized with sudden onset of severe chest pain. He was in cardiogenic shock with a systolic pressure of 60 mm Hg. His electrocardiogram (ECG) showed ST-segment elevation in the precordial leads suggestive of acute anteroseptal myocardial infarction. The ST-segment returned to baseline after the systolic blood pressure rose to 100 mm Hg with the administration of sympathomimetic agents. Aortography and transesophageal echocardiography demonstrated type A aortic dissection and aortic regurgitation. Aortography and short-axis transesophageal echocardiography showed during diastole almost complete collapse of the true lumen of the ascending aorta caused by the intimal flap. The patient underwent surgical repair of the aortic dissection and implantation of Palmaz stents in the carotid arteries. Decreased blood pressure and the presence of aortic regurgitation accelerated the collapse of the true lumen during diastole in the ascending aorta, resulting in functional obstruction of the left main coronary artery, which may have been related to ST-segment changes in this case.
Collapse
Affiliation(s)
- K Ashida
- The First Department of Internal Medicine, National Defense Medical College, Tokorozawa, Japan
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
37
|
Matsuura S, Tahara T, Ro T, Masumi T, Kasuya H, Yokota T. Aneurysmal bone cyst of the coronoid process of the mandible. Dentomaxillofac Radiol 1999. [DOI: 10.1038/sj.dmfr.4600468] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
|
38
|
Abstract
A rare case of an aneurysmal bone cyst (ABC) involving the right coronoid process of the mandible in a 12-year-old girl is presented. The characteristic features with fluid-fluid levels within the lesion observed on Magnetic Resonance Imaging (MRI) and Computed Tomography (CT) was helpful in the preoperative diagnosis.
Collapse
Affiliation(s)
- S Matsuura
- Department of Radiology, Kokura Memorial Hospital, Kitakyushu, Japan
| | | | | | | | | | | |
Collapse
|
39
|
|
40
|
Matsumoto A, Tahara T, Morita H, Usuki K, Ohashi H, Kokubo-Watarai A, Takahashi K, Shimizu E, Tsunakawa H, Ogami K, Miyazaki H, Urabe A, Kato T. Characterization of native human thrombopoietin in the blood of normal individuals and of patients with haematologic disorders. Thromb Haemost 1999; 82:24-9. [PMID: 10456449] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Thrombopoietin (TPO) isolated from thrombocytopenic plasma of various animal species has previously been shown to comprise only truncated forms of the molecule, presumably generated by proteolysis. Native TPO has now been partially purified from normal human plasma by immunoaffinity chromatography and was confirmed to be biologically active. Gel filtration in the presence of SDS revealed that TPO eluted in two peaks: a major peak corresponding to the elution position of fully glycosylated recombinant human TPO (rhTPO) consisting of 332 amino acid residues, and a minor peak corresponding to a smaller molecular size. Immunoblot analysis also revealed that most plasma-derived TPO migrated at the same position as fully glycosylated rhTPO, corresponding to a molecular size of approximately 80 to 100 kDa. Furthermore, the size distribution of circulating TPO in patients with various haematologic disorders did not differ markedly from that of plasma-derived TPO from healthy individuals. These results indicate that the truncation of circulating TPO is not related to disease pathophysiology, and that the predominant form of TPO in blood is a biologically active approximately 80- to 100-kDa species. The size distribution of TPO extracted from normal platelets was similar to that of TPO in plasma; the proportion of truncated TPO was decreased by prior incubation of platelets with hirudin. indicating that the endogenous truncated TPO, at least in platelet extract, was generated by thrombin-mediated cleavage.
Collapse
Affiliation(s)
- A Matsumoto
- Pharmaceutical Research Laboratory, Kirin Brewery Co., Ltd., Takasaki, Gunma, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
41
|
Kitano K, Shimodaira S, Ito T, Ichikawa N, Kodaira H, Kohara Y, Ueno M, Tahara T, Kato T, Ishida F, Kiyosawa K. Liver cirrhosis with marked thrombocytopenia and highly elevated serum thrombopoietin levels. Int J Hematol 1999; 70:52-5. [PMID: 10446496] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Three patients with liver cirrhosis (LC) and a bleeding tendency due to marked thrombocytopenia of less than 20 x 10(9)/l were admitted to our hospital for further examination. Bone marrow examination revealed megakaryocytic hypoplasia in all three patients. All patients exhibited amegakaryocytic thrombocytopenic purpura, myelodysplastic syndrome, or bone marrow hypoplasia. 111In-labeled platelet kinetic studies revealed decreased platelet production in all patients. Although serum thrombopoietin (sTPO) levels are usually within the normal level in patients with LC, the sTPO levels of our patients were about 10 times higher than the levels of normal subjects (1.22 +/- 0.37 fmol/ml): 13.34, 16.79, and 10.46 fmol/ml, respectively. These sTPO data supported our findings of decreased megakaryopoiesis. Our findings suggest that examination of sTPO levels is useful in determining the etiology of marked thrombocytopenia in LC patients.
Collapse
Affiliation(s)
- K Kitano
- Second Department of Internal Medicine, Shinshu University School of Medicine, Matsumoto, Japan.
| | | | | | | | | | | | | | | | | | | | | |
Collapse
|
42
|
Kinjo K, Kizaki M, Takayama N, Michikawa N, Oda A, Okamoto S, Tahara T, Kato T, Miyazaki H, Ikeda Y. Serum thrombopoietin and erythropoietin levels in patients with acute promyelocytic leukaemia during all-trans retinoic acid treatment. Br J Haematol 1999; 105:382-7. [PMID: 10233408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
Endogenous serum thrombopoietin (TPO) and various cytokines including erythropoietin (EPO), interleukin (IL)-3, IL-6, IL-11, granulocyte-colony stimulating factor (G-CSF), granulocyte-macrophage-colony stimulating factor (GM-CSF) and stem cell factor (SCF) levels were measured in five patients with acute promyelocytic leukaemia (APL) during all-trans retinoic acid (RA) treatment. During differentiation-inducing therapy, platelet counts slowly increased and reached a peak between days 29 and 46 (median day 35). Serum TPO levels increased parallel to the increasing platelet counts and reached a maximum level during the first 10-20 d of all-trans RA treatment. The circulating TPO levels then decreased in inverse correlation to the platelet counts. These unique changes in serum TPO levels revealed that TPO levels were not regulated by platelet or megakaryocyte mass in patients with APL during differentiation-inducing therapy, and it would appear that TPO levels are directly regulated by all-trans RA during the first 10-20 d of treatment. In addition, the change in circulating EPO levels and reticulocyte counts were similar to that of the TPO levels and platelet counts during all-trans RA treatment, suggesting a close relationship between TPO and EPO signalling.
Collapse
Affiliation(s)
- K Kinjo
- Division of Haematology, Keio University School of Medicine, Tokyo, Japan
| | | | | | | | | | | | | | | | | | | |
Collapse
|
43
|
Yasui N, Watanabe M, Iwao Y, Sakaguchi AA, Tahara T, Eramoto T, Mukai M, Hibi T, Kitajima M. Laparoscopically assisted bowel resection for primary mucosa-associated lymphoid tissue lymphoma of the cecum. Surg Laparosc Endosc Percutan Tech 1999; 9:156-9. [PMID: 11757546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
We present the first report of laparoscopic resection for colorectal mucosa-associated lymphoid tissue (MALT) lymphoma. A 76-year-old man was found to have MALT lymphoma of the cecum during colonoscopy. He underwent a laparoscopically assisted ileocecal resection after admission and was discharged 9 days postoperatively without any complications. Colorectal MALT lymphoma is a rare neoplasm that responds favorably to locally directed therapy, because it tends to remain localized for prolonged periods. Laparoscopic surgery for colorectal MALT lymphoma is considered feasible because it is minimally invasive, making it suitable for treatment of low-grade malignancies, such as MALT lymphoma, which cannot be removed endoscopically.
Collapse
Affiliation(s)
- N Yasui
- Department of Surgery, School of Medicine, Keio University, Tokyo, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
44
|
Chen WH, Hayashi S, Tahara T, Nogami Y, Koga T, Yamaguchi M, Fujita K. The dependence of catalytic activities of secondary functional beta-cyclodextrins on cavity structures. Chem Pharm Bull (Tokyo) 1999; 47:588-9. [PMID: 10319434 DOI: 10.1248/cpb.47.588] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Secondary imidazole-appended beta-cyclodextrin 5 with a nondistorted cavity synthesized from a novel intermediate 3-amino-3-deoxy-beta-cyclodextrin exhibits much greater catalytic activity in the ester hydrolysis than its isomer 6 with a distorted cavity, indicating that the catalytic activities of secondary functional cyclodextrins are dependent on cavity structures.
Collapse
Affiliation(s)
- W H Chen
- Faculty of Pharmaceutical Sciences, Nagasaki University, Japan
| | | | | | | | | | | | | |
Collapse
|
45
|
Matsushiro H, Kato H, Tahara T, Kato T, Iwata A, Watari T, Tsujimoto H, Hasegawa A. Molecular cloning and functional expression of feline thrombopoietin. Vet Immunol Immunopathol 1998; 66:225-36. [PMID: 9880100 DOI: 10.1016/s0165-2427(98)00190-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Feline thrombopoietin (TPO) was molecularly cloned to establish a basis for cytokine therapy of thrombocytopenia in cats. cDNA clones covering the whole coding sequence of feline TPO were isolated from feline liver. The feline TPO cDNA obtained in this study contained an open reading frame encoding 349 amino acid residues. The predicted amino acid sequence of feline TPO shared 78.7, 69.9, 72.9 and 83.0% similarity with sequences of human, murine, rat and canine TPO, respectively. Four cysteine residues and two of four N-glycosylation sites that are conserved among species were also found at the corresponding positions in feline TPO. The feline TPO cDNA fragment encoding the whole amino acid coding region was recloned into an expression vector, and the resulting vector was transfected into 293T cells using the calcium phosphate method. The supernatant of the transfected 293T cells stimulated the proliferation of a human megakaryoblastic leukemia cell line (UT-7/TPO) cells in a dose dependent manner, indicating that the feline TPO cDNA obtained in this study encodes biologically active feline TPO.
Collapse
Affiliation(s)
- H Matsushiro
- Department of Veterinary Internal Medicine, Faculty of Agriculture, The University of Tokyo, Japan
| | | | | | | | | | | | | | | |
Collapse
|
46
|
Tamura H, Ogata K, Luo S, Nakamura K, Yokose N, Dan K, Tohyama K, Yoshida Y, Hamaguchi H, Sakamaki H, Kuwaki T, Tahara T, Kato T, Nomura T. Plasma thrombopoietin (TPO) levels and expression of TPO receptor on platelets in patients with myelodysplastic syndromes. Br J Haematol 1998; 103:778-84. [PMID: 9858230 DOI: 10.1046/j.1365-2141.1998.01054.x] [Citation(s) in RCA: 24] [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
Data on endogenous thrombopoietin (TPO) levels and their regulation in myelodysplastic syndromes (MDS) are sparse. We examined the plasma TPO level of 85 MDS patients by a sensitive enzyme immunoassay and the platelet expression of TPO receptor (TPO-R) protein, which metabolizes endogenous TPO, in 19 MDS patients with an equilibrium binding assay using 125I-TPO. The MDS patients had higher plasma TPO levels (7.0 +/- 9.3 fmol/ml) than 52 normal subjects (P < 0.0001). Refractory anaemia (RA) patients (n = 39) had higher plasma TPO levels than patients (n = 28) with RA with excess blasts (RAEB) or RAEB in transformation (RAEB-t) (P = 0.0002), irrespective of similar platelet counts in these groups. The plasma TPO level correlated inversely with the platelet count in RA patients (P = 0.0027) but not in RAEB and RAEB-t patients (P = 0.7865). These data suggest that the physiological pathway for TPO production and metabolism is conserved, at least partially, in RA, but deranged in RAEB/RAEB-t. The number of TPO-R per platelet was significantly smaller in 19 MDS patients (17.5 +/- 13.3) than in normals (P = 0.0014), but similar between RA patients and patients with RAEB and RAEB-t. Further, the bone marrow megakaryocyte count, determined in 31 MDS patients, was quite similar between RA patients and patients with RAEB or RAEB-t. Thus, in addition to thrombocytopenia, a reduced platelet TPO-R number may contribute to elevated plasma TPO levels in MDS, and a regulatory pathway for circulating TPO other than platelet TPO-R and marrow megakaryocytes, such as blasts expressing TPO-R, may operate in RAEB/RAEB-t.
Collapse
Affiliation(s)
- H Tamura
- Third Department of Internal Medicine, Nippon Medical School, Tokyo, Japan
| | | | | | | | | | | | | | | | | | | | | | | | | | | |
Collapse
|
47
|
Ichikawa N, Kitano K, Shimodaira S, Ishida F, Ito T, Kajikawa S, Tahara T, Kato T, Kiyosawa K. Changes in serum thrombopoietin levels after splenectomy. Acta Haematol 1998; 100:137-41. [PMID: 9858790 DOI: 10.1159/000040888] [Citation(s) in RCA: 24] [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: 11/19/2022]
Abstract
To clarify the role of thrombopoietin (c-Mpl ligand, TPO) in 'hypersplenic' thrombocytopenia, we used an enzyme-linked immunosorbent assay to examine changes in serum TPO levels accompanied with splenectomy in 6 patients with liver cirrhosis, 4 patients with gastric cancer, and 2 patients with lymphoid malignancies. We also measured serum levels of other thrombopoietic cytokines such as interleukin-6 (IL-6) and erythropoietin. Platelet counts reached a maximum at day 14 after splenectomy in all subjects. In patients with liver cirrhosis, a lower elevation of platelet counts was observed compared with that in patients with gastric cancer. Serum TPO levels gradually elevated after splenectomy and reached a maximum 3.5 days after splenectomy in noncirrhotic patients, whereas peak serum TPO levels were delayed until day 7 in the cirrhosis group. IL-6 and erythropoietin showed similar kinetics between cirrhotic and noncirrhotic patients. These findings suggest that transient thrombocytosis after splenectomy may be associated with an alteration in the site of TPO catabolism by platelets from spleen to the blood and that deterioration of TPO production may play a role in thrombocytopenia in liver cirrhosis.
Collapse
Affiliation(s)
- N Ichikawa
- Second Department of Internal Medicine, Shinshu University School of Medicine, Matsumoto, Nagano-ken, Japan
| | | | | | | | | | | | | | | | | |
Collapse
|
48
|
Abstract
Marked thrombocytosis (over 50 x 10(4)/microl) is frequently seen in patients with hepatoblastoma. Thrombopoietin (TPO), c-mpl ligand, has recently been purified as the major physiological regulator of the thrombopoiesis and is mainly produced in the liver. Since it is possible that TPO participates in thrombocytosis and the tumor growth of this particular hepatic tumor, serum TPO levels in addition to interleukin 1beta (IL-1beta) and IL-6 levels were assessed in seven untreated patients by using a sandwich enzyme-linked immunosorbent assay. High serum TPO levels were observed in all of the examined patients. The level ranged from 3.15 to 11.02 (mean +/- standard deviation; 6.08+/-1.25) fmol/ml. IL-6 levels were also somewhat higher than normal. Platelet counts, however, appeared to correlate more with serum TPO levels (p = 0.1) than with IL-1beta (p = 0.5) and IL-6 (p = 0.2) levels. Furthermore, using the reverse transcriptase polymerase chain reaction method, the expression of c-mpl mRNA was found in five of eight hepatoblastoma tissues as well as TPO mRNA in all eight tissues. These observations suggest that thrombocytosis in hepatoblastoma patients results from the production of cytokine members, including TPO, within tumor tissues. Additionally, it is possible that TPO might act as a type of autocrine and/or paracrine system for cellular growth in this tumor.
Collapse
Affiliation(s)
- E Komura
- Department of Pediatrics, Kyoto Prefectural University of Medicine, Japan
| | | | | | | | | | | |
Collapse
|
49
|
Abstract
Thrombopoietin (TPO), the c-Mpl ligand, is produced constitutively in liver and other organs, circulates in the bloodstream, and is delivered to bone marrow, where it stimulates the early development of multiple hematopoietic lineages and megakaryocytopoiesis. The concentration of TPO in blood is regulated by c-Mpl mass on platelets and megakaryocytes. In addition to regulation by the number of TPO molecules, including the possible modulation of TPO mRNA abundance in bone marrow, megakaryocytopoiesis and platelet production may be regulated as a result of modulation of TPO activity by proteolytic processing that generates truncated forms of the molecule. Characterization of TPO partially purified from human plasma, however, revealed that the full-length molecule was the predominant form in the blood of both normal individuals and thrombocytopenic patients, although small amounts of truncated species were detected. Thus, truncation of TPO, at least that in the circulation examined, does not appear to contribute to the direct regulation of platelet production in response to increased demand. Given that native TPO isolated from the plasma of thrombocytopenic animals comprises truncated forms, the truncation of TPO is likely of physiological importance in the life history of this molecule.
Collapse
Affiliation(s)
- T Kato
- Pharmaceutical Research Laboratory, Kirin Brewery Co., Ltd., Takasaki, Gunma, Japan
| | | | | | | | | | | |
Collapse
|
50
|
Oh H, Tahara T, Bouvier M, Farrand A, McDonald GB. Plasma thrombopoietin levels in marrow transplant patients with veno-occlusive disease of the liver. Bone Marrow Transplant 1998; 22:675-9. [PMID: 9818695 DOI: 10.1038/sj.bmt.1701402] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Platelet transfusion requirements are higher among patients with veno-occlusive disease (VOD), compared to patients without VOD. One possible explanation is inadequate production of thrombopoietin (TPO), a protein synthesized in the liver. We prospectively studied 28 patients to test the hypothesis that plasma TPO levels were decreased in patients who developed VOD. Plasma TPO levels to day +30 were measured by ELISA (normal, 0.36+/-0.15 fmol/ml). VOD developed in 18/28 patients. Platelet transfusion requirements were significantly different in patients with and without VOD (97+/-46.1 units vs 51+/-33.2 units, P = 0.008). Plasma TPO levels were elevated at baseline (10.8+/-13.0 fmol/ml) and increased after transplant, with peak values of 32.3+/-10.3 fmol/ml at day +7. TPO levels were significantly higher at days +7 and +17 among patients with VOD than among those without VOD (P < 0.01). Regression analysis of TPO levels vs platelet counts showed a significant inverse relationship. We conclude that TPO levels were higher in patients with VOD and were inversely correlated with platelet counts, suggesting that regulation of TPO levels was related to platelet mass. Thrombocytopenia in patients with VOD cannot be explained by inadequate hepatic synthesis of TPO.
Collapse
Affiliation(s)
- H Oh
- 2nd Department of Internal Medicine, Chiba University School of Medicine, Japan
| | | | | | | | | |
Collapse
|