51
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Muragaki Y, Chernov M, Yoshimitsu K, Suzuki T, Iseki H, Maruyama T, Tamura M, Ikuta S, Nitta M, Watanabe A, Saito T, Okamoto J, Niki C, Hayashi M, Takakura K. Information-Guided Surgery of Intracranial Gliomas: Overview of an Advanced Intraoperative Technology. JOURNAL OF HEALTHCARE ENGINEERING 2012. [DOI: 10.1260/2040-2295.3.4.551] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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52
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Yoshimitsu K, Maruyama T, Muragaki Y, Suzuki T, Saito T, Nitta M, Tanaka M, Chernov M, Tamura M, Ikuta S, Okamoto J, Okada Y, Iseki H. Wireless modification of the intraoperative examination monitor for awake surgery. Neurol Med Chir (Tokyo) 2011; 51:472-6. [PMID: 21701117 DOI: 10.2176/nmc.51.472] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The dedicated intraoperative examination monitor for awake surgery (IEMAS) was originally developed by us to facilitate the process of brain mapping during awake craniotomy and successfully used in 186 neurosurgical procedures. This information-sharing device provides the opportunity for all members of the surgical team to visualize a wide spectrum of the integrated intraoperative information related to the condition of the patient, nuances of the surgical procedure, and details of the cortical mapping, practically without interruption of the surgical manipulations. The wide set of both anatomical and functional parameters, such as view of the patient's mimic and face movements while answering the specific questions, type of the examination test, position of the surgical instruments, parameters of the bispectral index monitor, and general view of the surgical field through the operating microscope, is presented compactly in one screen with several displays. However, the initially designed IEMAS system was occasionally affected by interruption or detachment of the connecting cables, which sometimes interfered with its effective clinical use. Therefore, a new modification of the device was developed. The specific feature is installation of wireless information transmitting technology using audio-visual transmitters and receivers for transfer of images and verbal information. The modified IEMAS system is very convenient to use in the narrow space of the operating room.
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Maruyama T, Hirakawa Y, Muragaki Y, Iseki H, Ikuta S, Sakuma I, Okada Y. Quantitative measurement of photodynamic diagnoses of glioblastoma multiforme by using 5-aminolevulinic acid-induced porphyrins. Photodiagnosis Photodyn Ther 2011. [DOI: 10.1016/j.pdpdt.2011.03.131] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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54
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Muragaki Y, Iseki H, Maruyama T, Tanaka M, Shinohara C, Suzuki T, Yoshimitsu K, Ikuta S, Hayashi M, Chernov M, Hori T, Okada Y, Takakura K. Information-Guided Surgical Management of Gliomas Using Low-Field-Strength Intraoperative MRI. INTRAOPERATIVE IMAGING 2011; 109:67-72. [DOI: 10.1007/978-3-211-99651-5_11] [Citation(s) in RCA: 60] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/02/2022]
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55
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Yanagi H, Kamikonya N, Yasui C, Aihara T, Ikuta S, Iida H, Tsubamoto H, Matsumoto S, Tomita N, Yamanaka N. Clinical results of preoperative chemoradiotherapy using short-term schedule (25 Gy) and long-term schedule (45-50.4 Gy) for lower rectal cancer. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e14035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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56
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Iida H, Yasui C, Aihara T, Ikuta S, Yoshie H, Tomomatsu M, Beppu N, Yanagi H, Yamanaka N. Patient and tumor characteristics to guarantee long-term survival following hepatic resection for hepatocellular carcinoma. J Clin Oncol 2010. [DOI: 10.1200/jco.2010.28.15_suppl.e14578] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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57
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Ikuta S, Kebarle P, Bancroft GM, Chan T, Puddephatt RJ. Basicities of methyl-, methylphenyl-, and phenylphosphines in the gas phase. J Am Chem Soc 2002. [DOI: 10.1021/ja00386a009] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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58
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Lau YK, Ikuta S, Kebarle P. Thermodynamics and kinetics of the gas-phase reactions H3O+(H2O)n-1 + water = H3O+(H2O)n. J Am Chem Soc 2002. [DOI: 10.1021/ja00370a002] [Citation(s) in RCA: 257] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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59
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Ikuta S. A theoretical study on the conformations and energetics on the cation–π interaction between monovalent ions (M+=Li+, Na+, and K+) and anthracene and phenanthrene molecules. ACTA ACUST UNITED AC 2000. [DOI: 10.1016/s0166-1280(00)00336-5] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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60
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Sekimoto T, Ikuta S, Pan W, Chu ST, Kokubun Y. Vertical antiresonant reflecting optical waveguide coupler for three-dimensional optical interconnects: optimum design for large tolerance, high coupling efficiency, and short coupling length. APPLIED OPTICS 2000; 39:426-430. [PMID: 18337911 DOI: 10.1364/ao.39.000426] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
A compact antiresonant-reflecting-optical-waveguide-(ARROW-) type vertical coupler for three-dimensional optical interconnects was demonstrated. The coupler consists of stacked ARROW's channeled by the stripe lateral confinement structure, and each waveguide is completely separated by a thin metal film in the separation region. In the coupling region the intermediate cladding of a previous coupler was made of the same material as that of the first cladding or the core. However, we had to overcome the problem that both the high coupling efficiency and the large fabrication tolerance cannot be achieved simultaneously. Thus we incorporated an intermediate cladding made of a material different from that of the core and the first cladding. The refractive index and the thickness of the intermediate cladding were optimally designed to achieve large fabrication tolerance and a short coupling length with a high coupling efficiency. The coupling length was reduced from 4.1 to 0.8 mm, and a high coupling efficiency of 96% was experimentally demonstrated.
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61
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Kohda-Sudoh S, Ikuta S, Nomura O, Katagiri S, Imamura M. Proton affinity of GeH4and the shape of GeH5+. ACTA ACUST UNITED AC 1999. [DOI: 10.1088/0022-3700/16/17/005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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62
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Yamashita K, Tsukuda H, Mizukami Y, Ito J, Ikuta S, Kondo Y, Kinoshita H, Fujisawa Y, Imai K. Hepatic infarction with portal thrombosis. J Gastroenterol 1997; 32:684-8. [PMID: 9349998 DOI: 10.1007/bf02934122] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
A case of hepatic infarction with portal thrombosis is reported. A 63-year-old woman with liver cirrhosis and esophageal varices was admitted for treatment of the esophageal varices. Endoscopic variceal ligation (EVL) and endoscopic injection sclerotherapy (EIS) were performed. Two months later, she experienced right hypochondralgia and right flank pain. Serum transaminase levels were suddenly elevated, and computed tomography scans of the liver showed multiple small nodular lesions. Her condition worsened, and she died of hepatic failure. Autopsy revealed splenic and portal vein thrombosis, multiple hepatic infarction, and evidence of chronic pancreatitis. We believe that liver cirrhosis and chronic pancreatitis were the main risk factors for the portal thrombosis, and the treatment for esophageal varices appeared to have triggered the thrombosis. The hepatic infarction was caused by the portal thrombosis.
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63
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Ohara M, Shiromaru H, Achiba Y, Aoki K, Hashimoto K, Ikuta S. Resonance‐enhanced multiphoton electron detachment spectrum of C5−. J Chem Phys 1995. [DOI: 10.1063/1.469876] [Citation(s) in RCA: 27] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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64
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Ikuta S, Itoh F, Hinoda Y, Toyota M, Makiguchi Y, Imai K, Yachi A. Expression of cytoskeletal-associated protein tyrosine phosphatase PTPH1 mRNA in human hepatocellular carcinoma. J Gastroenterol 1994; 29:727-32. [PMID: 7874267 DOI: 10.1007/bf02349278] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
We investigated the mRNA expression of cytosolic protein tyrosine phosphatase (PTPH1), which has a homologous domain to cytoskeletal-associated proteins, in human hepatocellular carcinomas (HCCs) by using reverse transcriptase-polymerase chain reaction (RT-PCR). PTPH1 mRNA was detected in all HCC cell lines (n = 6), and HCC and adjacent noncancerous tissues (n = 8) examined, indicating that PTPH1 was expressed in HCCs and hepatocytes. There was no remarkable difference in the level expression of PTPH1 mRNA between HCC and adjacent noncancerous tissues. We also performed RT-PCR single-strand conformation polymorphism (SSCP) analysis in HCC cell lines and tissues in the C-terminal region of the catalytic domain of PTPH1. In the cHc4 cell line and a HCC tissue specimen, a shifted band was detected, although it was not found in the non-cancerous tissue of the HCC specimen. Nucleotide sequence analysis showed a common mutation from T to C at the third letter of codon 919 which did not lead to amino acid substitution. These results suggest that another mutation leading to the development of HCC could occur in some region of PTPH1 other than that investigated in this study.
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Suga M, Senota A, Arima K, Kodama T, Ikuta S, Sakamoto H, Ohe Y, Sugai S, Yachi A. Prevalence of HBV and HCV infection in Japanese patients with hepatocellular carcinoma. HEPATO-GASTROENTEROLOGY 1994; 41:438-41. [PMID: 7531667] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Abstract
The prevalence of hepatitis B virus (HBV) and hepatitis C virus (HCV) infection was investigated in 63 Japanese patients with hepatocellular carcinoma (HCC). HBV infection was confirmed by measuring hepatitis B surface antigen and HBV-DNA in the serum, and HCV infection was confirmed by measuring antibody to HCV using a 2nd generation test and HCV-RNA in serum. Some 54.0% of the patients had HCV infection only, 27.0% had HBV infection only, and 9.5% had both HCV and HBV infection. Only 9.5% of HCC patients had neither HCV nor HBV markers. These results indicate that, in Japan, HCV and HBV infection is an important factor associated with HCC, and that the hepatitis virus may have a role in the carcinogenesis of HCC.
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Itoh F, Ikuta S, Hinoda Y, Arimura Y, Ohe M, Adachi M, Ariyama T, Inazawa J, Imai K, Yachi A. Expression and chromosomal assignment of PTPH1 gene encoding a cytosolic protein tyrosine phosphatase homologous to cytoskeletal-associated proteins. Int J Cancer 1993; 55:947-51. [PMID: 8253532 DOI: 10.1002/ijc.2910550612] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
We have investigated the mRNA expression of 2 human protein tyrosine phosphatases with sequence homology to cytoskeletal proteins, PTPH1 and PTPMEG. Northern-blot analysis of PTPH1 using poly (A)+ RNA from normal human colon tissue showed a low-abundance message of 4.3 kb. Reverse-transcriptase/polymerase-chain reaction (RT-PCR) was therefore used to detect it in a wide variety of cell lines including 9 colorectal, 5 gastric, 5 hepatic and 6 hematopoietic tumor cells. PTPH1 mRNA was not detected only in Colo 320 cells over-expressing c-myc mRNA, among the colorectal cancer cell lines examined. When Colo 320 cells were incubated with 5 mM sodium butyrate for 5 days, PTPH1 mRNA became detectable, concomitant with the marked decrease in the expression level of c-myc mRNA. Moreover, the chromosomal localization of PTPH1 gene was investigated by fluorescence in situ hybridization. Interestingly, PTPH1 gene was mapped to 9q31 where the gene for Gorlin syndrome, a putative tumor suppressor gene, exists.
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67
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Aoki K, Ikuta S, Murakami A. Most stable isomer and singlet—triplet energy separation in the HC4N molecule. Chem Phys Lett 1993. [DOI: 10.1016/0009-2614(93)80095-7] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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68
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Aoki K, Fueno H, Ikuta S, Nomura O. Geometries and stabilities of various conformers of cyanomethylene and other HC2N isomers. Chem Phys Lett 1993. [DOI: 10.1016/0009-2614(93)85346-p] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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69
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Ikuta S, Kirby JA, Shenton BK, Givan AL, Lennard TW. Human endothelial cells: effect of TNF-alpha on peripheral blood mononuclear cell adhesion. Immunology 1991; 73:71-6. [PMID: 1828455 PMCID: PMC1384520] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Human umbilical vein endothelial cells (HUVEC) were cultured and treated for varying periods with a range of concentrations of tumour necrosis factor-alpha (TNF-alpha). After this treatment the proportion of peripheral blood mononuclear cells (PBMC), previously depleted of plastic adherent cells, capable of binding to the endothelial cells was assessed. Few PBMC bound to HUVEC which had not been pretreated with TNF-alpha but up to 36% bound after pretreatment of the endothelial cells with TNF-alpha for 10 hr at a concentration of 10 U/ml. Phenotypic characterization of the adherent and non-adherent PBMC subpopulations revealed that natural killer (NK) cells (CD16+) and a proportion of memory helper T cells (CD4+ CD45RA-) bound to TNF-alpha pretreated HUVEC but that few naive helper T cells (CD4+ CD45RA+) showed similar binding. Cytotoxicity assays for NK activity were used to analyse functionally the adherent and non-adherent PBMC subpopulations. It was found that the cell subpopulation which did not adhere to TNF-alpha pretreated HUVEC mediated little lysis of K562 target cells. Conversely, the endothelial cell-adherent PBMC subpopulation produced active lysis supporting the phenotypic evidence that NK cells were concentrated within this subpopulation. These results suggest that TNF-alpha has a rapid and profound up-regulatory effect on the expression of adhesion molecules on the surface of HUVEC. Furthermore, it is apparent that these up-regulated adhesion molecules preferentially bind NK cells and a subset of memory helper T cells from the PBMC population.
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70
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Tanabe M, Harada M, Odawara F, Ikuta S, Nakagawa N, Otani M. Synthesis and assignment of novel [125I]-labeled 1 alpha,25-dihydroxyvitamin D3 derivatives. J Nutr Sci Vitaminol (Tokyo) 1991; 37:139-47. [PMID: 1919801 DOI: 10.3177/jnsv.37.139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This paper describes the synthesis and structural assignment of noval 125I-1 alpha,25-dihydroxyvitamin D3 derivatives (1a) and (1b) labeled with 125I-Bolton-Hunter reagent [N-succinimidyl 3-(4-hydroxy-3-iodo[125I]phenyl)propionate] (1), which is known as a protein-labeling reagent, as tracers for radioimmunoassay (RIA). The radiospecific activities of these tracers (1a) and (1b) were calculated as 2,200 Ci/mmol (81.4 TBq/mmol).
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71
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Kirby JA, Ikuta S, Clark K, Proud G, Lennard TW, Taylor RM. Renal allograft rejection: investigation of alloantigen presentation by cultured human renal epithelial cells. Immunology 1991; 72:411-7. [PMID: 1827426 PMCID: PMC1384404] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022] Open
Abstract
Defined lines of primary human renal epithelial cells were established and their expression of class II major histocompatibility (MHC) antigens was up-regulated by culture with interferon-gamma (IFN-gamma). The ability of these cells to stimulate the proliferation of allogeneic peripheral blood mononuclear cells (PBMC) was compared with that of endothelial cells and splenic mononuclear cells. It was found that both endothelial and splenic cells stimulated lympho-proliferation but that cultured renal epithelial cells were non-stimulatory. The failure of proliferation by allogeneic lymphocytes in culture with epithelial cells was not overcome by treatment with interleukin-1 (IL-1) or indomethacin. However, addition of IL-2 to mixed cultures of allogeneic PBMC and renal epithelial cells stimulated lympho-proliferation and allowed the generation of lymphoid cell lines which mediated non-specific lysis of renal epithelial cell lines. Stimulation of PBMC by mixed lymphocyte culture yielded an allospecific T-cell line which was added either to renal epithelial cells from the same donor as the stimulator cells used in the priming reaction or from a third-party donor; lympho-proliferation was observed in the specific secondary reaction but not in the non-specific reaction. These findings indicate that class II MHC antigen-expressing epithelial cells within a renal allograft may not initially stimulate the proliferation of resting allospecific recipient lymphocytes. However, within a rejecting graft it is likely that high local concentrations of IL-2 are present and that many of the infiltrating allospecific lymphocytes will be primed by previous contact with donor antigen-presenting cells, such as vascular endothelial cells or dendritic cells. Therefore, expression of class II MHC antigens by epithelial cells within the microenvironment of a renal allograft may render such cells immunogenic and able to play a direct role in the lymphocyte-mediated intragraft rejection process.
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Fernandez-Forner D, Palom Y, Ikuta S, Pedroso E, Eritja R. Synthesis and characterization of oligodeoxynucleotides containing the mutagenic base analogue 4-O-ethylthymine. Nucleic Acids Res 1990; 18:5729-34. [PMID: 2216766 PMCID: PMC332307 DOI: 10.1093/nar/18.19.5729] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
A method for the preparation of oligonucleotides containing the mutagenic base 4-O-ethylthymine is described for the first time. Use of p-nitrophenylethyl type base protecting groups together with phosphitetriester solid-phase methodology makes possible the rapid and efficient preparation of oligonucleotides bearing 4-O-ethylthymine, while standard base protecting groups are not compatible with the presence of this base. Possible applications of this methodology are discussed.
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Ishikawa M, Ikuta S, Katada M, Sano H. Anisotropy of van der Waals radii of atoms in molecules: alkali-metal and halogen atoms. ACTA CRYSTALLOGRAPHICA SECTION B: STRUCTURAL SCIENCE 1990. [DOI: 10.1107/s0108768190006644] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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74
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Horie H, Ikuta S, Takenaka T. Membrane elasticity of mouse dorsal root ganglion neurons decreases with aging. FEBS Lett 1990; 269:23-5. [PMID: 2387407 DOI: 10.1016/0014-5793(90)81109-2] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Elastic area compressibility modulus (EACM) method was applied to measure the membrane elasticity of cultured dorsal root ganglion neurons from fetal and 3-month-old mice. The values of the EACM were 21.3 dyn/cm in 3-month-old neurons and 2.8 dyn/cm in fetal neurons. These results indicate that neural cell membrane elasticity decreases with aging.
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Shintani H, Isozaki A, Kuwahara Y, Ikuta S, Kani M, Kani T. [The effect of ammonium fluoride solution at various concentrations on enamel]. GIFU SHIKA GAKKAI ZASSHI = THE JOURNAL OF GIFU DENTAL SOCIETY 1990; 17:170-6. [PMID: 2134756] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
The fluoride concentrations of ammonium fluoride solution (NH4F,pH 4.4), which has the same effect on enamel powder as conventional APF solution, were studied. Human enamel powder (200 mesh passed) was treated with solutions of NH4F (1,000 ppmF-, 3,000 ppmF-, 5,000 ppmF-, 7,000 ppmF-, 9,000 ppmF-, pH 4.4) and APF (9,000 ppmF-, pH 3.4) for 5 min. at 37 degrees C. Some of the specimen was washed with 1MKOH solution for 48 hours. Fluoride uptake by enamel powder was analyzed by means of chemical analysis and reaction products identified using X-ray diffractometry. The fluoride uptake of 5,000 ppmF- of NH4F-treated enamel was the same as that of APF-treated enamel. X-ray diffractometry showed that CaF2 was formed in the experimental groups. CaF2 with high crystallinity was formed in the NH4F-treated enamel, and the peak height of X-ray diffraction pattern of CaF2 in 3,000 ppmF- of NH4F-treated enamel was the same as that of APF-treated enamel. In conclusion, the ammonium fluoride solution of 3,000-5,000 ppmF- had a similar effect on enamel powder as conventional APF solution.
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