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Pełka R, Bałanda M, wasiutyński T, Nakazawa Y, Sorai M, Podgajny R, Sieklucka B. Thermal Properties of the Double-layered Coordination Polymer {(tetrenH5)0.8CuII 4[WV(CN)8]47.2H2O}n at the Transition Point. ACTA ACUST UNITED AC 2004. [DOI: 10.1007/s10582-004-0152-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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77
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Ishiguro K, Toyama J, Shahidul Islam MD, Yoshimoto M, Kumagai T, Kai Y, Nakazawa Y, Yamakawa O. SUIOH, A NEW SWEETPOTATO CULTIVAR FOR UTILIZATION IN VEGETABLE GREENS. ACTA ACUST UNITED AC 2004. [DOI: 10.17660/actahortic.2004.637.42] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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78
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Ogino S, Hashikura Y, Katsuyama Y, Ikegami T, Nakazawa Y, Urata K, Terada M, Miyagawa S, Kawasaki S. Conversion from tacrolimus to cyclosporine microemulsion therapy in liver transplant recipients. Transplant Proc 2004; 36:299S-301S. [PMID: 15041357 DOI: 10.1016/j.transproceed.2003.12.037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
The calcineurin inhibitors cyclosporine and tacrolimus have distinct advantages and drawbacks. Therefore it is important to tailor their use to the patient's tolerance. In some patients, the need to ameliorate the adverse effects of tacrolimus may necessitate a switch to cyclosporine-based therapy. Rescue therapy with a cyclosporine microemulsion (Neoral)-based regimen for transplant patients intolerant of tacrolimus has been evaluated to assess the best method of switching and determine the initial and maintenance doses of Neoral in children and adults. Our aims were to evaluate not only these facets, but also the pharmacokinetics of Neoral in stable patients, including target 2-hour postdose blood concentrations (C2) of cyclosporine in liver transplant recipients. Eighteen liver transplant patients switched from tacrolimus to Neoral underwent a program of cyclosporine blood level monitoring. The conversions were conducted safely; the incidence of acute rejection episodes was low (11.1%). Statistical analysis showed that the C2 correlated with the area under the time-blood concentration curve of cyclosporine for 0 to 4 hours after dosing (R=0.970). We determined the maintenance doses of Neoral for pediatric and adult patients as well as the feasibility of C2 quantitated monitoring in liver transplantation.
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79
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Bamba T, Fukusaki E, Nakazawa Y, Sato H, Ute K, Kitayama T, Kobayashi A. Analysis of long-chain polyprenols using supercritical fluid chromatography and matrix-assisted laser desorption ionization time-of-flight mass spectrometry. J Chromatogr A 2003; 995:203-7. [PMID: 12800936 DOI: 10.1016/s0021-9673(03)00498-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
The separation of long-chain polyprenols was successfully achieved using supercritical fluid chromatography (SFC). Each 100-mer greater component was separated using tetrahydrofuran as a mobile phase modifier. The molecular mass distributions derived from SFC analyses agreed with the results of matrix-assisted laser desorption ionization time-of-flight mass spectrometry (MALDI-TOF-MS) analyses. The number-average molecular mass calculated by MALDI-TOF-MS data were also in accord with the results of quantitative 1H-NMR analysis of terminal groups. A combination of SFC and MALDI-TOF-MS analyses is a powerful tool for the elucidation of the complicated structures of natural polyprenols.
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80
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Nakazawa Y, Shimada A, Noguchi J, Domeki I, Kaneko H, Kikuchi K. Replacement of nuclear protein by histone in pig sperm nuclei during in vitro fertilization. Reproduction 2002. [DOI: 10.1530/rep.0.1240565] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Sperm-specific nuclear protamines are dissociated before decondensation of sperm nuclei during fertilization in pigs. In the present study, replacement of nuclear protein by histone in boar spermatozoa during in vitro fertilization was evaluated by immunohistochemistry using anti-histone antibody. First, the specificity of the antibody used in this study was examined. Immunohistochemistry of the testes and epididymides indicated that somatic nuclei, but not elongated spermatids or maturing spermatozoa, were immunoreactive. Furthermore, immunoreaction was diminished after the antibody had been preincubated with unfractionated histone, indicating that the antibody was specific for the somatic nuclear histone. Immunohistochemistry of serial sections of oocytes, which were matured and co-cultured with boar spermatozoa for 2 to 6 h indicated that, at 2 to 3 h after insemination, penetrating sperm nuclei in the condensed state were not immunoreactive. At 4 to 5 h after insemination, some of the condensed sperm nuclei were immunoreactive in part or over the whole area of the nucleus, and all of the decondensing nuclei and male pronuclei were immunoreactive. At 6 h after insemination, the decondensing sperm nuclei and well-developed male pronuclei were immunoreactive. These results imply that, in pigs, remodelling of sperm nuclear protein from protamine to histone is initiated at the time of sperm penetration, before onset of decondensation and male pronuclear formation.
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Nakazawa Y, Shimada A, Noguchi J, Domeki I, Kaneko H, Kikuchi K. Replacement of nuclear protein by histone in pig sperm nuclei during in vitro fertilization. Reproduction 2002; 124:565-72. [PMID: 12361475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/26/2023]
Abstract
Sperm-specific nuclear protamines are dissociated before decondensation of sperm nuclei during fertilization in pigs. In the present study, replacement of nuclear protein by histone in boar spermatozoa during in vitro fertilization was evaluated by immunohistochemistry using anti-histone antibody. First, the specificity of the antibody used in this study was examined. Immunohistochemistry of the testes and epididymides indicated that somatic nuclei, but not elongated spermatids or maturing spermatozoa, were immunoreactive. Furthermore, immunoreaction was diminished after the antibody had been preincubated with unfractionated histone, indicating that the antibody was specific for the somatic nuclear histone. Immunohistochemistry of serial sections of oocytes, which were matured and co-cultured with boar spermatozoa for 2 to 6 h indicated that, at 2 to 3 h after insemination, penetrating sperm nuclei in the condensed state were not immunoreactive. At 4 to 5 h after insemination, some of the condensed sperm nuclei were immunoreactive in part or over the whole area of the nucleus, and all of the decondensing nuclei and male pronuclei were immunoreactive. At 6 h after insemination, the decondensing sperm nuclei and well-developed male pronuclei were immunoreactive. These results imply that, in pigs, remodelling of sperm nuclear protein from protamine to histone is initiated at the time of sperm penetration, before onset of decondensation and male pronuclear formation.
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82
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Shinohara T, Hara H, Kato Y, Asano M, Nakazawa Y, Kato T, Nogaki T, Yamashita Y. Implantation of rectal cancer cells in a fistula in ano: report of a case. Surg Today 2002; 31:1094-6. [PMID: 11827191 DOI: 10.1007/s595-001-8065-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
We report a case of implantation of tumor cells within a fistula in ano. A 36-year-old man with a 16-year history of an anal fistula underwent an operation for rectal carcinoma. Three weeks later, the anal fistula was resected. A histological examination of the specimen showed atypical cells; moreover, rectal carcinoma had proliferated in the granulation tissue lying underneath the intact squamous epithelium. Because there was no continuity to the rectal carcinoma or the anal glands, we diagnosed implantation of rectal cancer cells in a fistula in ano.
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Chisuwa H, Hashikura Y, Nakazawa Y, Kamijo T, Nakazawa K, Nakayama J, Oh-Ishi T, Ikegami T, Terada M, Kawasaki S. Fatal hemophagocytic syndrome after living-related liver transplantation: a report of two cases. Transplantation 2001; 72:1843-6. [PMID: 11740400 DOI: 10.1097/00007890-200112150-00024] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
BACKGROUND Hemophagocytic syndrome (HPS) is a serious hematological disorder caused by activated T lymphocytes in immunologically compromised patients. There is no report of HPS in liver transplant recipients. METHODS Among 135 patients who underwent living-related liver transplantation between June 1990 and October 2000, HPS developed in two pediatric patients (1.5%) on the 15th and 134th postoperative day, respectively. The courses of these patients were evaluated. RESULTS The cause of HPS was unknown in patient 1 and suspected to be Epstein-Barr virus infection in patient 2. The course of patient 2 was also complicated by posttransplant lymphoproliferative disorder. Both patients had high fever, pancytopenia, coagulopathy, and marked elevation of serum-soluble interleukin 2 receptor, serum ferritin, and urine beta2-microglobulin levels. The diagnosis was established based on clinical findings, laboratory data, and bone marrow biopsy. Both patients died in an acute course despite intensive care. CONCLUSIONS HPS should be recognized as a severe hematological complication in liver transplant patients. Prompt institution of adequate treatment is necessary to prevent fatality.
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84
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Sakai M, Egawa N, Sakamaki H, Sanaka M, Yuyang T, Kamisawa T, Sakaki N, Funata N, Nakazawa Y, Ikegami T, Hashikura Y, Kawasaki S. Primary sclerosing cholangitis complicated with idiopathic thrombocytopenic purpura. Intern Med 2001; 40:1209-14. [PMID: 11813846 DOI: 10.2169/internalmedicine.40.1209] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
We present a 66-year-old woman with primary sclerosing cholangitis (PSC) complicated with idiopathic thrombocytopenic purpura (ITP). Both PSC and ITP are considered to reflect an immunological disturbance. However, their coexistence is very rare and to the best of our knowledge this is only the second reported case. In Japan, PSC patients are rarely treated with liver transplantation. Fortunately, the present patient underwent successful hepatic transplantation from a brain-dead donor and simultaneous splenectomy. This case emphasizes the importance of liver transplantation as an effective treatment for primary sclerosing cholangitis.
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85
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Deyama T, Nishibe S, Nakazawa Y. Constituents and pharmacological effects of Eucommia and Siberian ginseng. Acta Pharmacol Sin 2001; 22:1057-70. [PMID: 11749801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023] Open
Abstract
The bark and leaves of Eucommia ulmoides Oliv (Eucommiaceae) and "Siberian ginseng" (Ezoukogi in Japanese) prepared from the root bark or stem bark of Eleutherococcus senticosus Maxim (Acanthopanax senticosus Harms) have been used as tonic and anti-stress drug. The extracts of Eucommia showed anti-hypertensive, anti-complementary, anti-oxidative, and anti-gastric ulcer effects, and promoting collagen synthesis, accelating granuloma formation, and other pharmacological effects. The Siberian ginseng exhibited anti-fatigue, anti-stress, immuno-enhancing effect, CNS activity, and anti-depressive effect. By now, 40, 28, and 10 compounds have been isolated from Eucommia ulmoides bark, Eucommia ulmoides leaves, and Siberian ginseng, respectively, and their structures were elucidated. Their pharmacological activities were mainly due to lignans and iridoid glycosides.
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86
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Inagaki M, Nakazawa Y, Hirano M, Kobayashi Y, Toyoda M. Preparation of stable anatase-type TiO2 and its photocatalytic performance. ACTA ACUST UNITED AC 2001. [DOI: 10.1016/s1466-6049(01)00176-3] [Citation(s) in RCA: 122] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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87
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Hosokoshi Y, Katoh K, Nakazawa Y, Nakano H, Inoue K. Approach to a single-component ferrimagnetism by organic radical crystals. J Am Chem Soc 2001; 123:7921-2. [PMID: 11493072 DOI: 10.1021/ja015711r] [Citation(s) in RCA: 66] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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88
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Hashikura Y, Kawasaki S, Terada M, Ikegami T, Nakazawa Y, Urata K, Chisuwa H, Mita A, Ohno Y, Miyagawa S. Long-term results of living-related donor liver graft transplantation: a single-center analysis of 110 transplants. Transplantation 2001; 72:95-9. [PMID: 11468541 DOI: 10.1097/00007890-200107150-00019] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
BACKGROUND Difficulties of cadaveric donation and serious donor shortage have led to the development and popularization of living-related donor liver graft transplantation (LRLT). Because the history of this procedure is rather short, important aspects specific to this procedure have not been sufficiently documented. The objective of this study was to analyze a single center's 10-year experience with 110 LRLT in pediatric and adult patients with end-stage liver diseases. METHODS The medical records of 110 consecutive patients who underwent LRLT were reviewed. The recipients were comprised of 72 children and 38 adults. The graft volume corresponded to 26-192% of the recipient's standard liver volume. The relationship between pretransplant covariates and patient and graft survival was analyzed. Actuarial patient/graft survival rates were determined at 1, 3, and 5 years. The type and incidence of posttransplant complications were analyzed, as was long-term graft function. RESULTS The 1-, 3-, and 5-year actuarial patient and graft survival rates were 88%, 85%, and 85%, respectively. Log-rank test demonstrated that ABO-compatibility predicted patient survival rate, whereas patient age, underlying disease, patient's clinical status, donor-recipient relation, donor age, and graft volume/standard liver volume ratio did not. Long-term liver function remains excellent. All the donors have returned to normal daily lives with an uneventful course. CONCLUSIONS LRLT is an efficacious procedure that provides excellent short-term and long-term survival. The indication criteria for both recipient and donor were legitimate in this series, except for transplant across ABO-incompatibility. Cautious expansion of this procedure may be justified under the situation of serious shortage of cadaveric donor.
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89
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Kotorii T, Kotorii T, Uchimura N, Hashizume Y, Shirakawa S, Satomura T, Tanaka J, Nakazawa Y, Maeda H. Questionnaire relating to sleep paralysis. Psychiatry Clin Neurosci 2001; 55:265-6. [PMID: 11422869 DOI: 10.1046/j.1440-1819.2001.00853.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
A sleep survey was conducted on 8162 citizens. The cumulative experience rate of sleep paralysis was 39.6%. The initial occurrence of sleep paralysis peaked at age 16 years. In addition to being higher in young people than in older subjects, the incidence of sleep paralysis was also higher among women than among men, and was significantly higher among shift worker than non-shift worker, and among persons engaged in the nursing profession than those not engaged in the nursing profession. The experience rate of sleep paralysis demonstrated a strong correlation with the frequency of dreaming, the experience rate of nightmares, times and regularity of going to bed and waking up, and particularly with the degree of insomnia.
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90
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Hagimoto R, Koike K, Sakashita K, Ishida T, Nakazawa Y, Kurokawa Y, Kamijo T, Saito S, Hiraoka A, Kobayashi M, Komiyama A. A possible role for maternal HLA antibody in a case of alloimmune neonatal neutropenia. Transfusion 2001; 41:615-20. [PMID: 11346696 DOI: 10.1046/j.1537-2995.2001.41050615.x] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
BACKGROUND Alloimmune neonatal neutropenia (ANN) is caused by a reaction of maternal alloantibodies with paternally inherited antigens on the fetal neutrophils. While human neutrophil antigens (HNA) antibodies are found in half of ANN cases, specific antibodies have not been defined in the remaining cases. STUDY DESIGN AND METHODS Reported here is a neonate with omphalitis due to neutropenia. To elucidate the cause of ANN, flow cytometric and PCR analyses were used. Reactions of the patient's and mother's sera with neutrophils, lymphocytes, and platelets were examined by lymphocytotoxicity test (LCT), anti-human immunoglobulin-LCT, and mixed passive hemagglutination test. RESULTS The maternal sera reacted with neutrophils, lymphocytes, and platelets of the patient and father. The platelet adsorption eliminated the reaction of the maternal serum with the patient's neutrophils. The HLA typing of the family and an LCT using a panel of lymphocytes of 20 HLA-typed donors showed HLA-A2 antigen as a target of antibodies in the maternal serum. According to anti-human immunoglobulin-LCT, the anti-HLA-A2 was present in the neonatal serum. On the other hand, HNA antibodies were not detectable in the patient's or the mother's serum. CONCLUSION These results suggest that the transplacental passage of the maternal HLA antibody caused neutropenia in this patient.
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91
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Asakura T, Yamane T, Nakazawa Y, Kameda T, Ando K. Structure of Bombyx mori silk fibroin before spinning in solid state studied with wide angle x-ray scattering and (13)C cross-polarization/magic angle spinning NMR. Biopolymers 2001; 58:521-5. [PMID: 11241223 DOI: 10.1002/1097-0282(20010415)58:5<521::aid-bip1027>3.0.co;2-t] [Citation(s) in RCA: 76] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
The structure of a crystalline form of Bombyx mori silk fibroin, commonly found before the spinning process (known as silk I), has been proposed as a repeated beta-turn type II-like structure by combining data obtained from solid-state two dimensional spin-diffusion nuclear magnetic resonance and rotational-echo double-resonance (T. Asakura et al., J Mol Biol, in press). In this paper, the WAXS pattern of alanine-glycine alternating copolypeptide, (Ala-Gly)(15) with silk I form which was used for a silk I model of B. mori silk fibroin was observed. The pattern calculated with the silk I model proposed by us is well reproduced the observed one, indicating the validity of the proposed silk I model. In addition, two peptides of the other repeated sequences which contain Tyr or Val residues in the silk fibroin,23 were synthesized; (Ala-Gly-Tyr-Gly-Ala-Gly)(5) and (X-Gly)(15) where X is Tyr for the 7th, 15th and 23th residues, and Val for the 11th residue and Ala for other residues. There are no sharp peaks in the WAXS patterns, and therefore both samples are in the non-crystalline state. This is in agreement with the (13)C CP/MAS NMR result, where the conformation is mainly random coil.
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92
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Mwamtemi HH, Koike K, Kinoshita T, Ito S, Ishida S, Nakazawa Y, Kurokawa Y, Shinozaki K, Sakashita K, Takeuchi K, Shiohara M, Kamijo T, Yasui Y, Ishiguro A, Kawano Y, Kitano K, Miyazaki H, Kato T, Sakuma S, Komiyama A. An increase in circulating mast cell colony-forming cells in asthma. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2001; 166:4672-7. [PMID: 11254727 DOI: 10.4049/jimmunol.166.7.4672] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
We compared a potential to generate mast cells among various sources of CD34(+) peripheral blood (PB) cells in the presence of stem cell factor (SCF) with or without thrombopoietin (TPO), using a serum-deprived liquid culture system. From the time course of relative numbers of tryptase-positive and chymase-positive cells in the cultured cells grown by CD34(+) PB cells of nonasthmatic healthy individuals treated with G-CSF, TPO appears to potentiate the SCF-dependent growth of mast cells without influencing the differentiation into mast cell lineage. CD34(+) PB cells from asthmatic patients in a stable condition generated significantly more mast cells under stimulation with SCF alone or SCF+TPO at 6 wk of culture than did steady-state CD34(+) PB cells of normal controls. Single-cell culture studies showed a substantial difference in the number of SCF-responsive or SCF+TPO-responsive mast cell progenitors in CD34(+) PB cells between the two groups. In the presence of TPO, CD34(+) PB cells from asthmatic children could respond to a suboptimal concentration of SCF to a greater extent, compared with the values obtained by those of normal controls. Six-week cultured mast cells of asthmatic subjects had maturation properties (intracellular histamine content and tryptase/chymase enzymatic activities) similar to those derived from mobilized CD34(+) PB cells of nonasthmatic subjects. An increase in a potential of circulating hemopoietic progenitors to differentiate into mast cell lineage may contribute to the recruitment of mast cells toward sites of asthmatic mucosal inflammation.
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93
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Asakura T, Ashida J, Yamane T, Kameda T, Nakazawa Y, Ohgo K, Komatsu K. A repeated beta-turn structure in poly(Ala-Gly) as a model for silk I of Bombyx mori silk fibroin studied with two-dimensional spin-diffusion NMR under off magic angle spinning and rotational echo double resonance. J Mol Biol 2001; 306:291-305. [PMID: 11237601 DOI: 10.1006/jmbi.2000.4394] [Citation(s) in RCA: 203] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The structure of a crystalline form of Bombyx mori silk fibroin, commonly found before the spinning process (known as silk I), was proposed by combining data obtained from two-dimensional spin-diffusion nuclear magnetic resonance under off magic angle spinning, rotational-echo double-resonance (REDOR), previously reported X-ray diffraction analyses and 13C NMR chemical shifts. Instead of B. mori silk fibroin with silk I structure, we used the sequential model peptide (Ala-Gly)15. The structure of the sequential model peptide is characterized as silk I after dissolving the peptide in 9 M LiBr and then dialyzing against water. Moreover, 13C or 15N-labeled sites may be introduced easily at any position in (Ala-Gly)(15) by the solid phase synthesis method for these NMR experiments. The torsional angles of (Ala-Gly)15 with silk I structure were determined as (-60(+/-5) degrees, 130(+/-5) degrees ) and (70(+/-5) degrees, 30(+/-5) degrees ) for Ala and Gly residues, respectively. The formation of the intra-molecular hydrogen bonding along the chain was confirmed from REDOR NMR by determination of the inter-atomic distance between the nitrogen and carbon atoms comprising the intra-molecular hydrogen bonding. The structure is named a repeated beta-turn type II-like structure.
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Horie H, Matsumoto T, Takahashi M, Nakazawa Y, Yokohama H, Minai K, Kinoshita M. Angiographically documented coronary steal phenomenon evoked by the intracoronary infusion of bradykinin. JAPANESE CIRCULATION JOURNAL 2001; 65:123-5. [PMID: 11216821 DOI: 10.1253/jcj.65.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
While studying flow-dependent coronary dilation using a Doppler flow velocity guidewire, total occlusion of a stenosed segment of the left circumflex artery during the intracoronary infusion of bradykinin was angiographically documented. Total occlusion was not demonstrated during intracoronary infusion of bradykinin after angioplasty. This is angiographic confirmation of the coronary steal phenomenon that has been previously described in the field of stress scintigraphy.
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95
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Kohno T, Ihara K, Sugesawa K, Fukada Y, Miura H, Maesako N, Shirota K, Yamada T, Nakazawa Y, Shiode N, Nakamura N. [Efficacy of radiofrequency catheter ablation in a patient with sinus node reentrant tachycardia]. RINSHO BYORI. THE JAPANESE JOURNAL OF CLINICAL PATHOLOGY 2001; 49:183-8. [PMID: 11307314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
Abstract
We performed electrophysiological study and catheter ablation on a 62-year-old patient with supraventricular tachycardia(SVT). This SVT was reproducibly initiated and terminated by atrial stimulation during the electrophysiological testing. The P-wave morphology and atrial activation sequence of intracardiac electrograms were identical to those in normal sinus rhythm. SVT was terminated with carotid sinus massage that increased vagal tone, and for this reason, the reentry circuit of SVT could be localized in sinus node. On the basis of these findings, the SVT was diagnosed as sinus node re-entrant tachycardia and was successfully eliminated by radiofrequency catheter ablation. Radiofrequency catheter ablation would be effective in patients with sinus node reentrant tachycardia refractory to anti-arrhythmic drugs. It should, however, be performed with careful consideration to the influence of the sinus node.
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96
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Fujiwara H, Fujiwara E, Nakazawa Y, Narymbetov BZ, Kato K, Kobayashi H, Kobayashi A, Tokumoto M, Cassoux P. A novel antiferromagnetic organic superconductor kappa-(BETS)(2)FeBr(4) [where BETS = bis(ethylenedithio)tetraselenafulvalene]. J Am Chem Soc 2001; 123:306-14. [PMID: 11456517 DOI: 10.1021/ja002439x] [Citation(s) in RCA: 87] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The electrical and magnetic properties of kappa-(BETS)(2)FeBr(4) salt [where BETS = bis(ethylenedithio)tetraselenafulvalene] showed that this system is the first antiferromagnetic organic metal at ambient pressure (T(N) = 2.5 K). The characteristic field dependence of the magnetization at 2.0 K indicates a clear metamagnetic behavior. The small resistivity drop observed at T(N) clearly shows the existence of the interaction between pi metal electrons and localized magnetic moments of Fe(3+) ions. In addition, this system underwent a superconducting transition at 1.1 K. That is, kappa-(BETS)(2)FeBr(4) is the first antiferromagnetic organic metal exhibiting a superconducting transition below Néel temperature. The magnetic field dependence of the superconducting critical temperature indicated that the superconductivity in this system is strongly anisotropic also in the conduction plane because of the existence of the metamagnetically induced internal field based on the antiferromagnetic ordering of the Fe(3+) 3d spins in contrast to the cases of the other conventional organic superconductors. Furthermore, the specific heat measurement exhibited a lambda-type large peak of zero-field specific heat corresponding to the three-dimensional antiferromagnetic ordering of high-spin Fe(3+) ions. The lack of distinct anomaly in the C(p) vs T curve at T(c) suggests the coexistence of the superconductivity and the antiferromagnetic order below T(c).
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Ikegami T, Ogawa S, Ogino S, Wada Y, Ono Y, Chisuwa H, Urata K, Nakazawa Y, Hashikura Y, Terada M, Miyagawa S, Kawasaki S. ["Domino" transplantation]. NIHON NAIKA GAKKAI ZASSHI. THE JOURNAL OF THE JAPANESE SOCIETY OF INTERNAL MEDICINE 2001; 90:15-20. [PMID: 11215465] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/19/2023]
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98
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Nakazawa Y, Jonsson JR, Walker NI, Kerlin P, Steadman C, Lynch SV, Strong RW, Clouston AD. Fibrous obliterative lesions of veins contribute to progressive fibrosis in chronic liver allograft rejection. Hepatology 2000; 32:1240-7. [PMID: 11093730 DOI: 10.1053/jhep.2000.20350] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/07/2022]
Abstract
Fibrosis in liver allografts undergoing chronic rejection (CR) is variable and poorly understood. The temporal and spatial relationships of venous, arterial, and biliary lesions were studied to clarify their potential contributions to graft fibrosis. The severity, prevalence, and morphology of intimal lesions of vessels were analyzed and compared with the fibrosis stage. Three groups were found; group 1 (n = 5) with no hepatic vein (HV) lesions, group 2 (n = 5) with HV lesions only, and group 3 with lesions of both HV and portal veins (PV). The earliest lesion to develop, in 71% of grafts, was concentric intimal thickening of small HV. This was significantly more severe and frequent in grafts from group 3. With increasing frequency and severity of small HV sclerosis, fibrosis developed in medium/large veins. The morphology of larger vessel lesions suggested organized thrombus. Centrilobular fibrosis was significantly more severe in group 3 and developed unpredictably and sometimes rapidly. Conversely, portal fibrosis scores were significantly higher in grafts with ductular proliferation and did not correlate with venous lesions. This suggests that in CR, veno-occlusive-like lesions develop commonly in terminal hepatic venules, probably caused by immune-mediated damage. In only a proportion, with increased frequency and severity of the lesions, stasis and thrombosis in portal and larger veins occur and could result in loss of hepatic and portal venous outflow, which leads to ischemia and fibrosis. The stage of fibrosis did not correlate with foam-cell arteriopathy. A second pathway of portal fibrosis occurs in patients with longstanding biliary proliferation.
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Nakayama J, Ota H, Katsuyama T, Nakazawa Y, Hashikura Y, Kawasaki S. [Pathological examination for liver transplantation]. RINSHO BYORI. THE JAPANESE JOURNAL OF CLINICAL PATHOLOGY 2000; 48:1022-8. [PMID: 11132555] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Liver biopsy plays an important role in the histopathological evaluation of the transplanted liver. In this review, we would like to describe the histological features of various forms of diseases such as allograft rejections occurring in transplanted livers. When severe steatosis is found in the donor liver, transplantation is contraindicated. Ischemic liver damage caused by transplant hypoperfusion is called harvesting or re-perfusion injury and characterized by the histological features of liver-cell ballooning, centrilobular cholestasis, and apoptosis of hepatocytes. Acute rejection occurring more commonly in the first few weeks after transplantation is defined by the diagnostic triad of portal inflammatory infiltrates, endothelialitis, and bile duct damage, whereas chronic rejection is characterized by the presence of ductopenia and foam cell arteriopathy. Obstruction of the hepatic artery leads to severe centrilobular necrosis of the allograft. Among viral infections affecting the allografts, cytomegalovirus infection occurs most frequently, and typical intranuclear or cytoplasmic inclusions are hallmarks of the infection. Post-transplantation lymphoproliferative disorders are closely associated with Epstein-Barr virus infection. Therapeutic drugs such as azathioprine and cyclosporin A also cause liver damage, but specific histological features of drug-induced injury have not yet been clarified. Recurrence of original diseases such as viral hepatitis or malignant tumors is also evaluated by the liver biopsy.
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Kawasaki S, Hashikura Y, Ikegami T, Nakazawa Y, Mita A, Terada M, Miyagawa SI. Indications and needs for living-related transplantation in adults. J Gastroenterol Hepatol 2000; 15 Suppl:E175-7. [PMID: 10921403 DOI: 10.1046/j.1440-1746.2000.02120.x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/09/2022]
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