51
|
Ohoka N, Nagai K, Hattori T, Okuhira K, Shibata N, Cho N, Naito M. Cancer cell death induced by novel small molecules degrading the TACC3 protein via the ubiquitin-proteasome pathway. Cell Death Dis 2014; 5:e1513. [PMID: 25375378 PMCID: PMC4260729 DOI: 10.1038/cddis.2014.471] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2014] [Revised: 09/22/2014] [Accepted: 09/24/2014] [Indexed: 12/26/2022]
Abstract
The selective degradation of target proteins with small molecules is a novel approach to the treatment of various diseases, including cancer. We have developed a protein knockdown system with a series of hybrid small compounds that induce the selective degradation of target proteins via the ubiquitin–proteasome pathway. In this study, we designed and synthesized novel small molecules called SNIPER(TACC3)s, which target the spindle regulatory protein transforming acidic coiled-coil-3 (TACC3). SNIPER(TACC3)s induce poly-ubiquitylation and proteasomal degradation of TACC3 and reduce the TACC3 protein level in cells. Mechanistic analysis indicated that the ubiquitin ligase APC/CCDH1 mediates the SNIPER(TACC3)-induced degradation of TACC3. Intriguingly, SNIPER(TACC3) selectively induced cell death in cancer cells expressing a larger amount of TACC3 protein than normal cells. These results suggest that protein knockdown of TACC3 by SNIPER(TACC3) is a potential strategy for treating cancers overexpressing the TACC3 protein.
Collapse
|
52
|
Sano-Furukawa A, Hattori T, Arima H, Yamada A, Tabata S, Kondo M, Nakamura A, Kagi H, Yagi T. Six-axis multi-anvil press for high-pressure, high-temperature neutron diffraction experiments. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:113905. [PMID: 25430122 DOI: 10.1063/1.4901095] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
We developed a six-axis multi-anvil press, ATSUHIME, for high-pressure and high-temperature in situ time-of-flight neutron powder diffraction experiments. The press has six orthogonally oriented hydraulic rams that operate individually to compress a cubic sample assembly. Experiments indicate that the press can generate pressures up to 9.3 GPa and temperatures up to 2000 K using a 6-6-type cell assembly, with available sample volume of about 50 mm(3). Using a 6-8-type cell assembly, the available conditions expand to 16 GPa and 1273 K. Because the six-axis press has no guide blocks, there is sufficient space around the sample to use the aperture for diffraction and place an incident slit, radial collimators, and a neutron imaging camera close to the sample. Combination of the six-axis press and the collimation devices realized high-quality diffraction pattern with no contamination from the heater or the sample container surrounding the sample. This press constitutes a new tool for using neutron diffraction to study the structures of crystals and liquids under high pressures and temperatures.
Collapse
|
53
|
Ohoka N, Nagai K, Okuhira K, Shibata N, Hattori T, Cho N, Naito M. 155 SNIPER(TACC3) degrades TACC3 protein via the ubiquitin–proteasome pathway and induces apoptosis in cancer cells expressing a large amount of TACC3. Eur J Cancer 2014. [DOI: 10.1016/s0959-8049(14)70281-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
54
|
Murata H, Hattori T, Maeda H, Takashiba S, Takigawa M, Kido J, Nagata T. Identification of transactivation-responsive DNA-binding protein 43 (TARDBP43; TDP-43) as a novel factor for TNF-α expression upon lipopolysaccharide stimulation in human monocytes. J Periodontal Res 2014; 50:452-60. [PMID: 25202836 DOI: 10.1111/jre.12227] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/13/2014] [Indexed: 12/12/2022]
Abstract
BACKGROUND AND OBJECTIVE Tumor necrosis factor alpha (TNF-α) is a major cytokine implicated in various inflammatory diseases. The nature of the nuclear factors associated with human TNF-α gene regulation is not well elucidated. We previously identified a novel region located from -550 to -487 in human TNF-α promoter that did not contain the reported binding sites for nuclear factor kappa B (NF-κB) but showed lipopolysaccharide (LPS)-induced transcriptional activity. The purpose of this study is to identify novel factors that bind to the promoter region and regulate TNF-α expression. MATERIAL AND METHODS To identify DNA-binding proteins that bound to the target region of TNF-α promoter, a cDNA library from LPS-stimulated human monocytic cell line THP-1 was screened using a yeast one-hybrid system. Cellular localizations of the DNA-binding protein in the cells were examined by subcellular immunocytochemistry. Nuclear amounts of the protein in LPS-stimulated THP-1 cells were identified by western blot analysis. Expression of mRNA of the protein in the cells was quantified by real-time polymerase chain reaction. Electrophoretic mobility shift assays were performed to confirm the DNA-binding profile. Overexpression of the protein and knockdown of the gene were also performed to investigate the role for TNF-α expression. RESULTS Several candidates were identified from the cDNA library and transactivation-responsive DNA-binding protein 43 (TARDBP43; TDP-43) was focused on. Western blot analysis revealed that nuclear TDP-43 protein was increased in the LPS-stimulated THP-1 cells. Expression of TDP-43 mRNA was already enhanced before TNF-α induction by LPS. Electrophoretic mobility shift assay analysis showed that nuclear extracts obtained by overexpressing FLAG-tagged TDP-43 bound to the -550 to -487 TNF-α promoter fragments. Overexpression of TDP-43 in THP-1 cells resulted in an increase of TNF-α expression. Knockdown of TDP-43 in THP-1 cells downregulated TNF-α expression. CONCLUSION We identified TDP-43 as one of the novel TNF-α factors and found that it bound to the LPS-responsive element in the TNF-α promoter to increase TNF-α expression.
Collapse
|
55
|
Yasui K, Yabe I, Yoshida K, Kanai K, Arai K, Ito M, Onodera O, Koyano S, Isozaki E, Sawai S, Adachi Y, Sasaki H, Kuwabara S, Hattori T, Sobue G, Mizusawa H, Tsuji S, Nishizawa M, Nakashima K. A 3-year cohort study of the natural history of spinocerebellar ataxia type 6 in Japan. Orphanet J Rare Dis 2014; 9:118. [PMID: 25053188 PMCID: PMC4223818 DOI: 10.1186/s13023-014-0118-4] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2014] [Accepted: 07/11/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Only a few prospective studies have determined which clinical symptoms and factors are associated with the disease severity of spinocerebellar ataxia type 6 (SCA6). A multicenter longitudinal cohort study was conducted to clarify both the natural history of SCA6 in Japan and the factors influencing disease progression. METHODS Patients were consecutively recruited between 2007 and 2008. Scores from the Scale for the Assessment and Rating of Ataxia (SARA) and Barthel Index (BI) were collected prospectively each year. Additionally, data from the Japan intractable diseases research (IDR) registry were collected both retrospectively, from 2003 to 2006, and prospectively, from 2007 to 2010. As a result, we were able to collect 3 years of retrospective data and 4 years of prospective data during the course of 3 yearly visits. RESULTS Forty-six patients were registered. The follow-up rate of the third year was 93%. The SARA scores worsened significantly each year. Over 3 years, the decline of the SARA scores was 1.33 ± 1.40 points/year. The results of multivariate analysis of the decline of the SARA score were not significant. The IDR scores correlated well with the SARA and BI scores. Kaplan-Meier curves of 7 years of data from the IDR registry illustrated the correlation between the ability to walk and the time course of the disease. CONCLUSIONS Information regarding the progression of ataxia and the decline in the activities of daily living (ADL) in patients with SCA6 was obtained by a 3-year cohort study and a 7-year IDR study. The decline of the SARA score of patients with SCA6 was 1.33 ± 1.40 points/year. The results elucidate the natural history of SCA6, factors influencing disease severity, and utility of data from the IDR registry of Japan.
Collapse
|
56
|
Kondo T, Oshima T, Koseki J, Hattori T, Kase Y, Tomita T, Fukui H, Watari J, Miwa H. Effect of rikkunshito on the expression of substance P and CGRP in dorsal root ganglion neurons and voluntary movement in rats with experimental reflux esophagitis. Neurogastroenterol Motil 2014; 26:913-21. [PMID: 24712488 DOI: 10.1111/nmo.12342] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2013] [Accepted: 03/17/2014] [Indexed: 12/13/2022]
Abstract
BACKGROUND While there are reports that the herbal medicine rikkunshito (RKT) relieves upper gastrointestinal disease symptoms, the effect of RKT on primary afferent neurons is unknown. METHODS A model of reflux esophagitis (RE) was implemented using male Wistar rats aged 6-7 weeks. Ten days after surgery, the total area of esophageal mucosal erosion sites was determined. Th8-10 dorsal root ganglia (DRG) were dissected out and the expression of substance P (SP), calcitonin gene-related peptide (CGRP), and phosphorylated extracellular signal-regulated kinase 1/2 (p-ERK1/2) was determined in DRG using immunohistochemistry. RKT (0.6%/WV) or omeprazole (OME) (10 mg/kg) was administered for 10 days beginning on the day after surgery. Voluntary movement was measured with an infrared sensor for 22 h each day. KEY RESULTS RE rats showed esophageal mucosal erosion and significantly increased number of SP/CGRP- and p-ERK1/2-immunoreactive neurons in DRG. Treatment with OME improved the size of erosive lesions in the esophageal mucosa of RE rats, while RKT did not. Treatment with RKT or OME significantly reduced the expression of SP/CGRP and p-ERK1/2 in DRG, and significantly increased voluntary movement in RE rats. CONCLUSIONS & INFERENCES RKT inhibited the activation of ERK1/2 and decreased the expression of SP and CGRP in DRG of RE rats, which may be associated with the observed amelioration of voluntary movement.
Collapse
|
57
|
Bohgaki M, Kasahara H, Shimizu Y, Hattori T, Yasojima N, Kamishima T, Koike T. AB0994 Usefulness of Tomosynthesis in the Diagnosis of Early Rheumatoid Arthritis. Ann Rheum Dis 2014. [DOI: 10.1136/annrheumdis-2014-eular.3990] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
|
58
|
Nahata M, Saegusa Y, Sadakane C, Yamada C, Nakagawa K, Okubo N, Ohnishi S, Hattori T, Sakamoto N, Takeda H. Administration of exogenous acylated ghrelin or rikkunshito, an endogenous ghrelin enhancer, improves the decrease in postprandial gastric motility in an acute restraint stress mouse model. Neurogastroenterol Motil 2014; 26:821-31. [PMID: 24684160 PMCID: PMC4415484 DOI: 10.1111/nmo.12336] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/03/2013] [Accepted: 03/06/2014] [Indexed: 02/08/2023]
Abstract
BACKGROUND Physical or psychological stress causes functional disorders in the upper gastrointestinal tract. This study aims to elucidate the ameliorating effect of exogenous acylated ghrelin or rikkunshito, a Kampo medicine which acts as a ghrelin enhancer, on gastric dysfunction during acute restraint stress in mice. METHODS Fasted and postprandial motor function of the gastric antrum was wirelessly measured using a strain gauge force transducer and solid gastric emptying was detected in mice exposed to restraint stress. Plasma corticosterone and ghrelin levels were also measured. To clarify the role of ghrelin on gastrointestinal dysfunction in mice exposed to stress, exogenous acylated ghrelin or rikkunshito was administered, then the mice were subjected to restraint stress. KEY RESULTS Mice exposed to restraint stress for 60 min exhibited delayed gastric emptying and increased plasma corticosterone levels. Gastric motility was decreased in mice exposed to restraint stress in both fasting and postprandial states. Restraint stress did not cause any change in plasma acylated ghrelin levels, but it significantly increased the plasma des-acyl ghrelin levels. Administration of acylated ghrelin or rikkunshito improved the restraint stress-induced delayed gastric emptying and decreased antral motility. Ameliorating effects of rikkunshito on stress-induced gastric dysfunction were abolished by simultaneous administration of a ghrelin receptor antagonist. CONCLUSIONS & INFERENCES Plasma acylated/des-acyl ghrelin imbalance was observed in acute restraint stress. Supplementation of exogenous acylated ghrelin or enhancement of endogenous ghrelin signaling may be useful in the treatment of decreased gastric function caused by stress.
Collapse
|
59
|
Yoshino K, Yabe T, Hattori T, Saito K, Ishikawa A, Ohki H. (10)B-NMR determination of (10)B-BPA, (10)B-BPA-fructose complex and total (10)B in blood for BNCT. Appl Radiat Isot 2014; 88:74-7. [PMID: 24530317 DOI: 10.1016/j.apradiso.2013.12.020] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 12/20/2013] [Accepted: 12/21/2013] [Indexed: 11/18/2022]
Abstract
First spontaneous, noninvasive determination method of (10)B-BPA, (10)B-BPA-fructose complex, and total (10)B in blood is described. (10)B-NMR measurement with 100,000 FT accumulation enables us to obtain the result within 100min/sample. The detection limits for the simultaneous analysis were 3ppm, 3ppm and 6ppm for (10)B-BPA, (10)B-BPA-fructose complex and total (10)B respectively in this study. By this method, we can actually discuss behavior of the (10)B-BPA-fructose complex in blood.
Collapse
|
60
|
Sugai I, Oyaizu M, Takeda Y, Kawakami H, Kawasaki K, Hattori T, Kadono T. Sputtering angle effects by Kr mixing in N+ ion beam on the lifetime of nitrided carbon stripper foils. J Radioanal Nucl Chem 2014. [DOI: 10.1007/s10967-013-2665-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
|
61
|
Inoue T, Hattori T, Sugimoto S, Sasai K. Design study of electron cyclotron resonance-ion plasma accelerator for heavy ion cancer therapy. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:02A958. [PMID: 24593537 DOI: 10.1063/1.4862208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Electron Cyclotron Resonance-Ion Plasma Accelerator (ECR-IPAC) device, which theoretically can accelerate multiple charged ions to several hundred MeV with short acceleration length, has been proposed. The acceleration mechanism is based on the combination of two physical principles, plasma electron ion adiabatic ejection (PLEIADE) and Gyromagnetic Autoresonance (GYRAC). In this study, we have designed the proof of principle machine ECR-IPAC device and simulated the electromagnetic field distribution generating in the resonance cavity. ECR-IPAC device consisted of three parts, ECR ion source section, GYRAC section, and PLEIADE section. ECR ion source section and PLEIADE section were designed using several multi-turn solenoid coils and sextupole magnets, and GYRAC section was designed using 10 turns coil. The structure of ECR-IPAC device was the cylindrical shape, and the total length was 1024 mm and the maximum diameter was 580 mm. The magnetic field distribution, which maintains the stable acceleration of plasma, was generated on the acceleration center axis throughout three sections. In addition, the electric field for efficient acceleration of electrons was generated in the resonance cavity by supplying microwave of 2.45 GHz.
Collapse
|
62
|
Charrier A, Chen L, Chen R, Hattori T, Takigawa M, Brigstock D. Production of Nano-Sized Exosomes by Fibrogenic Cells of the Liver or Pancreas: Role in Intercellular Delivery of Pro-Fibrotic Molecules and Potential as Novel Drug Delivery Agents In Vivo. J Surg Res 2014. [DOI: 10.1016/j.jss.2013.11.871] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
|
63
|
Yamaguchi A, Sako K, Sato K, Hayashizaki N, Hattori T. Measurement of beam characteristics from C(6+) laser ion source. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2014; 85:02B921. [PMID: 24593626 DOI: 10.1063/1.4847197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
We developed a C(6+) laser ion source for a heavy-ion accelerator. A carbon target was irradiated with a Q-switched Nd:YAG laser (1064 nm wavelength, 1.4 J maximum laser energy, 10 ns pulse duration) to generate a high-density plasma. The laser ion source employed a rotating carbon target for continuous operation. Ion beams were extracted from the plasma through a drift space using a direct plasma injection scheme [B. Yu. Sharkov, A. V. Shumshurov, V. P. Dubenkow, O. B. Shamaev, and A. A. Golubev, Rev. Sci. Instrum. 63, 2841 (1992)] up to a maximum voltage of 40 kV. We measured the characteristics of the ion beams from the laser ion source and present the results of experiments here.
Collapse
|
64
|
Takeyama N, Tomino A, Hashiba M, Hirakawa A, Hattori T, Miyabe H. Altered T-cell repertoire diversity in septic shock patients. Crit Care 2014. [PMCID: PMC4068891 DOI: 10.1186/cc13413] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
|
65
|
Yan J, Gomi M, Hattori T, Qiao J, Yokota T. Phase Transition of BiFe1-xAlxO3 Films Prepared by Chemical Solution Deposition. ACTA ACUST UNITED AC 2014. [DOI: 10.2497/jjspm.61.s321] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
66
|
Yamamoto T, Sakakibara R, Uchiyama T, Yamaguchi C, Ohno S, Nomura F, Yanagisawa M, Hattori T, Kuwabara S. Time-dependent changes and gender differences in urinary dysfunction in patients with multiple system atrophy. Neurourol Urodyn 2013; 33:516-23. [PMID: 23754466 DOI: 10.1002/nau.22441] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2013] [Accepted: 05/03/2013] [Indexed: 11/05/2022]
Abstract
AIMS Because time-dependent changes and gender differences in urinary dysfunction in patients with multiple system atrophy (MSA) are yet unknown, we aimed to determine these parameters through a combination of urodynamic examination and the results of a questionnaire on urinary symptoms. METHODS We retrospectively reviewed 66 patients with MSA who responded to a urinary symptoms questionnaire and underwent urodynamic examination more than twice. The participants' mean age was 62 years and mean disease duration at the first urodynamic examination was 3.2 years. Mean duration between the first and second urodynamic examination was 441 days. RESULTS With regard to overall (both genders) time-dependent change, none of the urinary symptoms showed significant differences. In the urodynamic examination there were significant differences in reduced urine flow, increased post-void residuals, and decreased detrusor contractility at the second examination. With regard to gender differences, at the first examination, night-time urinary frequency, and voiding symptoms were significantly more severe in male than in female patients; however, at the second examination, except for urinary urgency, gender differences were not observed for any other symptoms. In urodynamic examination, the degree of detrusor contraction was significantly less in male patients at the first examination. However, no significant differences were found in urodynamic examination at the second examination. CONCLUSIONS The present study indicates that voiding dysfunction progressed without significant worsening of voiding symptoms. In addition, gender differences are important in evaluating urinary dysfunction being basically less severe in female than in male patients, at least during the early stage. Neurourol. Urodynam. 33:516-523, 2014. © 2013 Wiley Periodicals, Inc.
Collapse
|
67
|
Maeda H, Umezawa H, Hattori T, Nakamura T, Umeda T, Kobayashi H, Kawachi H, Iida A, Shiono M. Early and late outcomes of inflammatory abdominal aortic aneurysms: comparison with the outcomes after open surgical and endovascular aneurysm repair in literature reviews. INT ANGIOL 2013; 32:67-73. [PMID: 23435394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
AIM The aim of this study was to analyze the clinical characteristics, operative management and early and late outcomes of Inflammatory abdominal aortic aneurysms (IAAAs) in our vascular service, retrospectively and to compare with the outcomes of open and endovascular aneurysm repair (EVAR) in the patients with IAAAs in literature reviews. METHODS Between January 1990 and December 2011, this series included twenty-four patients with IAAAs who underwent surgical treatment. The mean length of follow-up was 37.6 months (range 3-108). Kaplan-Meier life tables were used to calculate survival rate. RESULTS Fifteen patients (60%) were symptomatic including 3 patients with hydronephrosis. Seven patients with severe symptoms underwent emergency operations. Twenty four patients underwent open surgical AAA repair. The 30 - day mortality rates were 0%. All patients had successful post operative courses and followed as outpatients in an elective situation. The ten year cumulative survival rate was 70%. The early and late mortality was the same for open repair compared to non-inflammatory AAA. CONCLUSIONS IAAA compared with non-IAAA is associated with a higher incidence of preoperative morbidity, however operative mortality rates are lower. EVAR has lower early operative mortality rates, however, there are some problems such as remaining periaortic fibrosis and hydronephrosis in approximately half of IAAA patients after EVAR.
Collapse
|
68
|
Delfanazari K, Asai H, Tsujimoto M, Kashiwagi T, Kitamura T, Yamamoto T, Sawamura M, Ishida K, Watanabe C, Sekimoto S, Minami H, Tachiki M, Klemm RA, Hattori T, Kadowaki K. Tunable terahertz emission from the intrinsic Josephson junctions in acute isosceles triangular Bi₂Sr₂CaCu₂O₈+δ mesas. OPTICS EXPRESS 2013; 21:2171-2184. [PMID: 23389198 DOI: 10.1364/oe.21.002171] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In order to determine if the mesa geometry might affect the properties of the coherent terahertz (THz) radiation emitted from the intrinsic Josephson junctions in mesas constructed from single crystals of the high-temperature superconductor, Bi₂Sr₂CaCu₂O₈+δ, we studied triangular mesas. For equilateral triangular mesas, the observed emission was found to be limited to the single mesa TM(1,0) mode. However, tunable radiation over the range from 0.495 to 0.934 THz was found to arise from an acute isosceles triangular mesa. This 47% tunability is the widest yet observed from the outer current-voltage characteristic branch of such mesas of any geometry. Although the radiation at a few of the frequencies in the tunable range appear to have been enhanced by cavity resonances, most frequencies are far from such resonance frequencies, and can only be attributed to the ac-Josephson effect.
Collapse
|
69
|
Kawaguchi N, Yamada T, Hattori T. Rare tendency of catching cold in Parkinson's disease. Parkinsonism Relat Disord 2012; 4:207-9. [PMID: 18591112 PMCID: PMC7128559 DOI: 10.1016/s1353-8020(98)00035-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/08/1998] [Revised: 10/08/1998] [Accepted: 10/08/1998] [Indexed: 11/28/2022]
Abstract
We carried out a study, using a questionnaire, that indicated that persons with Parkinson's disease (PD) catch relatively fewer colds that are unusually mild. This tendency seems to have no clear relationship to the severity of the PD, the time after the onset of PD, or whether or not the patient is taking antiparkinsonian drugs either as mono therapy or in combination. The study found no similar phenomena among spouses of the PD patients or among patients with cerebrovascular disease. These results suggest that a low frequency of colds is a unique feature in persons with PD.
Collapse
|
70
|
Matsushita M, Kitoh H, Kaneko H, Mishima K, Itoh Y, Hattori T, Ishiguro N. Novel Compound Heterozygous Mutations in the Cathepsin K Gene in Japanese Female Siblings with Pyknodysostosis. Mol Syndromol 2012; 2:254-258. [PMID: 22822386 DOI: 10.1159/000336581] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 01/11/2012] [Indexed: 11/19/2022] Open
Abstract
We report on female siblings with pyknodysostosis who showed common clinical and radiographic features including disproportionate short stature, dental abnormalities, increased bone density, open fontanelle, and acroosteolysis. Sequence analysis of the cathepsin K (CTSK) gene demonstrated compound heterozygous mutations (935 C>T, A277V and 489 G>C, R122P) in the affected siblings and a heterozygous mutation in their parents. The former missense mutation has previously been reported in 6 unrelated patients, and the latter seemed to be a novel mutation. Atomic model assessment of the CTSK gene revealed that the R122P mutant could disrupt hydrogen bonds binding with chondroitin 4-sulfate leading to a decrease in the collagen-degrading activity of cathepsin K.
Collapse
|
71
|
Machida A, Honda M, Hattori T, Sano-Furukawa A, Watanuki T, Katayama Y, Aoki K, Komatsu K, Arima H, Ohshita H, Ikeda K, Suzuya K, Otomo T, Tsubota M, Doi K, Ichikawa T, Kojima Y, Kim DY. Formation of NaCl-type monodeuteride LaD by the disproportionation reaction of LaD2. PHYSICAL REVIEW LETTERS 2012; 108:205501. [PMID: 23003152 DOI: 10.1103/physrevlett.108.205501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/18/2011] [Revised: 03/13/2012] [Indexed: 06/01/2023]
Abstract
Previous x-ray diffraction measurements revealed the pressure-induced decomposition of an fcc LaH2.3 into H-rich and H-poor fcc phases around 11 GPa. The present neutron diffraction measurements on LaD2 confirm the formation of NaCl-type LaD as a counterpart of the D-rich LaD2+δ by disproportionation. First-principles enthalpy and lattice dynamic calculations demonstrate that the NaCl-type LaH is stabilized at high pressures and can be recovered at ambient conditions. Finding the NaCl-type LaH will pave the way for investigations on the site-dependent nature of hydrogen-metal interactions.
Collapse
|
72
|
Tomiyama Y, Miyakawa Y, Okamoto S, Katsutani S, Kimura A, Okoshi Y, Ninomiya H, Kosugi H, Nomura S, Ozaki K, Ikeda Y, Hattori T, Katsura K, Kanakura Y. A lower starting dose of eltrombopag is efficacious in Japanese patients with previously treated chronic immune thrombocytopenia. J Thromb Haemost 2012; 10:799-806. [PMID: 22409309 DOI: 10.1111/j.1538-7836.2012.04695.x] [Citation(s) in RCA: 60] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
BACKGROUND Eltrombopag is an oral, non-peptide thrombopoietin receptor agonist that has shown efficacy and safety in chronic immune thrombocytopenia (ITP). However, ethnic differences in eltrombopag exposure have been reported: area under the curve exposure to eltrombopag was 87% greater among ITP patients of East Asian descent than among ITP patients of non-East Asian ITP descent. OBJECTIVES To evaluate the efficacy and safety of eltrombopag by using, in Japanese ITP patients, lower starting (12.5 mg) and maximum (50 mg) doses of eltrombopag than the standard starting (50 mg) and maximum (75 mg) doses approved in the USA and Europe. PATIENTS We examined 23 Japanese patients with previously treated chronic ITP with a platelet count of < 30,000 μL(-1) in a multicenter study comprising a randomized, double-blind, placebo-controlled phase for 6-week evaluation (15 eltrombopag, and eight placebo) and an open-label phase for 6-month evaluation (23 eltrombopag). RESULTS AND CONCLUSIONS The response rate (platelet count of ≥ 50,000 μL(-1) ) at week 6 of the 6-week double-blind phase was 60% in eltrombopag-treated patients and 0% in placebo-treated patients. Ten of 23 patients (43.5%) responded for ≥ 75% of predefined assessment visits during the 6-month open-label phase. Notably, 22% (5/23) of patients responded to 12.5 mg of eltrombopag, which was administered within the first 3 weeks of eltrombopag treatment. Bleeding decreased with eltrombopag treatment as compared with baseline. Eltrombopag was generally well tolerated; one patient experienced a transient ischemic attack on day 9. Eltrombopag (12.5-50 mg) is effective for the management of Japanese patients with chronic ITP (NCT00540423).
Collapse
MESH Headings
- Administration, Oral
- Adult
- Aged
- Asian People
- Benzoates/administration & dosage
- Benzoates/adverse effects
- Benzoates/pharmacokinetics
- Blood Platelets/drug effects
- Blood Platelets/immunology
- Blood Platelets/metabolism
- Chronic Disease
- Double-Blind Method
- Female
- Hematologic Agents/administration & dosage
- Hematologic Agents/adverse effects
- Hematologic Agents/pharmacokinetics
- Hemorrhage/blood
- Hemorrhage/ethnology
- Hemorrhage/immunology
- Hemorrhage/prevention & control
- Humans
- Hydrazines/administration & dosage
- Hydrazines/adverse effects
- Hydrazines/pharmacokinetics
- Japan/epidemiology
- Male
- Middle Aged
- Placebos
- Platelet Count
- Purpura, Thrombocytopenic, Idiopathic/blood
- Purpura, Thrombocytopenic, Idiopathic/drug therapy
- Purpura, Thrombocytopenic, Idiopathic/ethnology
- Purpura, Thrombocytopenic, Idiopathic/immunology
- Pyrazoles/administration & dosage
- Pyrazoles/adverse effects
- Pyrazoles/pharmacokinetics
- Receptors, Thrombopoietin/agonists
- Receptors, Thrombopoietin/blood
- Time Factors
- Treatment Outcome
Collapse
|
73
|
Ishikawa T, Miyata S, Koyama Y, Yoshikawa K, Hattori T, Kumamoto N, Shingaki K, Katayama T, Tohyama M. Transient expression of Xpn, an XLMR protein related to neurite extension, during brain development and participation in neurite outgrowth. Neuroscience 2012; 214:181-91. [PMID: 22531377 DOI: 10.1016/j.neuroscience.2012.04.030] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2011] [Revised: 03/11/2012] [Accepted: 04/09/2012] [Indexed: 12/22/2022]
Abstract
KIAA2022 has been implicated as a gene responsible for expressing X-linked mental retardation (XLMR) proteins in humans. However, the functional role of KIAA2022 in the human brain remains unclear. Here, we revealed that depletion of Kiaa2022 inhibits neurite outgrowth of PC12 cells, indicating that the gene participates in neurite extension. Thus, we termed Kiaa2022 as an XLMR protein related to neurite extension (Xpn). Using the mouse brain as a model and ontogenetic analysis of Xpn by real-time PCR, we clearly demonstrated that Xpn is expressed transiently during the late embryonic and perinatal stages. In situ hybridization histochemistry further revealed that Xpn-expressing neurons could be categorized ontogenetically into three types. The first type showed transient expression of Xpn during development. The second type maximally expressed Xpn during the late embryonic or perinatal stage. Thereafter, Xpn expression in this type of neuron decreased gradually throughout development. Nevertheless, a significant level of Xpn expression was detected even into adulthood. The third type of neurons initiated expression of Xpn during the embryonic stage, and continued to express the gene throughout the remaining developmental stages. Subsequent immunohistochemical analysis revealed that Xpn was localized to the nucleus and cytoplasm throughout brain development. Our findings indicate that Xpn may participate in neural circuit formation during developmental stages via nuclear and cytoplasmic Xpn. Moreover, disturbances of this neuronal circuit formation may play a role in the pathogenesis of mental retardation.
Collapse
|
74
|
Siddiqi UR, Punpunich W, Chuchottaworn C, Jindakul S, Ashino Y, Saitoh H, Okada M, Chotpittayasunondh T, Hattori T. Elevated anti-tuberculous glycolipid antibody titres in healthy adults and tuberculosis patients in Thailand. Int J Tuberc Lung Dis 2012; 16:532-8. [DOI: 10.5588/ijtld.10.0764] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
|
75
|
Yamamoto T, Sakakibara R, Uchiyama T, Yamaguchi C, Nomura F, Ito T, Yanagisawa M, Yano M, Awa Y, Yamanishi T, Hattori T, Kuwabara S. Receiver operating characteristic analysis of sphincter electromyography for parkinsonian syndrome. Neurourol Urodyn 2012; 31:1128-34. [DOI: 10.1002/nau.22208] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/01/2011] [Accepted: 01/11/2012] [Indexed: 01/07/2023]
|