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Okubo M, Shiozaki M, Tsujihiro M, Tsukuda Y. Preparation of micron-size monodisperse polymer particles by seeded polymerization utilizing the dynamic monomer swelling method. Colloid Polym Sci 1991. [DOI: 10.1007/bf00665495] [Citation(s) in RCA: 107] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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34 |
107 |
2
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Shiozaki K, Shiozaki M, Russell P. Mcs4 mitotic catastrophe suppressor regulates the fission yeast cell cycle through the Wik1-Wis1-Spc1 kinase cascade. Mol Biol Cell 1997; 8:409-19. [PMID: 9188094 PMCID: PMC276093 DOI: 10.1091/mbc.8.3.409] [Citation(s) in RCA: 104] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
Spc1 in Schizosaccharomyces pombe is a member of the stress-activated protein kinase family, an evolutionary conserved subfamily of mitogen-activated protein kinases (MAPKs). Spc1 is activated by a MAPK kinase homologue, Wis1, and negatively regulated by Pyp1 and Pyp2 tyrosine phosphatases. Mutations in the spc1+ and wis1+ genes cause a G2 cell cycle delay that is exacerbated during stress. Herein, we describe two upstream regulators of the Wis1-Spc1 cascade. wik1+ (Wis1 kinase) was identified from its homology to budding yeast SSK2, which encodes a MAPKK kinase that regulates the HOG1 osmosensing pathway. Delta wik1 cells are impaired in stress-induced activation of Spc1 and show a G2 cell cycle delay and osmosensitive growth. Moreover, overproduction of a constitutively active form of Wik1 induces hyperactivation of Spc1 in wis1(+)-dependent manner, suggesting that Wik1 regulates Spc1 through activation of Wis1. A mutation of mcs4+ (mitotic catastrophe suppressor) was originally isolated as a suppressor of the mitotic catastrophe phenotype of a cdc2-3w wee1-50 double mutant. We have found that mcs4- cells are defective at activation of Spc1 in response to various forms of stress. Epistasis analysis has placed Mcs4-upstream of Wik1 in the Spc1 activation cascade. These results indicate that Mcs4 is part of a sensor system for multiple environmental signals that modulates the timing of entry into mitosis by regulating the Wik1-Wis1-Spc1 kinase cascade. Inactivation of the sensor system delays the onset of mitosis and rescues lethal premature mitosis in cdc2-3w wee1-50 cells.
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Shiozaki M, Yoshimura K, Shibata M, Koike M, Matsuura N, Uchiyama Y, Gotow T. Morphological and biochemical signs of age-related neurodegenerative changes in klotho mutant mice. Neuroscience 2008; 152:924-41. [PMID: 18343589 DOI: 10.1016/j.neuroscience.2008.01.032] [Citation(s) in RCA: 103] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2007] [Revised: 01/07/2008] [Accepted: 01/22/2008] [Indexed: 12/23/2022]
Abstract
Klotho mutant mice, defective in the klotho gene, develop multiple age-related disorders with very short lifespans. Introduction of the exogenous klotho gene into these mutant mice leads to an improvement in their phenotypes, while overexpression of this gene in wild-type mice significantly extends their lifespan. These observations suggest that the klotho gene/protein has an anti-aging function. Since there have been only a few reports with some disagreement about results on the CNS of the mutant mice, we tried to clarify whether the CNS neurons generate aging-like features, even in premature stages, using biochemical and morphological approaches. Results obtained from the mutant mice, when compared with wild-type mice, were as follows. Neurofilaments (NFs) were increased significantly in axons, with the subunit proteins showing a significant enhancement in phosphorylation or expression of NF-H or NF-L, respectively. Microtubules in Purkinje cell dendrites were closer to each other, and in the CNS tissue tubulin was unaltered, but microtubule-associated protein (MAP) 2 was significantly reduced in expression. Neuronal cellular organelles were morphologically disordered. Lysosomes, cathepsin D and light chain 3 of MAP1A/B (LC3) were augmented with the appearance of putative autophagy-related structures. Antiapoptotic Bcl-xL and proapoptotic Bax were reduced and enhanced, respectively, and mitogen-activated protein kinase was reduced. Synapse-related proteins and structures were decreased. Neuronal degeneration was evident in hippocampal pyramidal cells, and possibly in Purkinje cells. Astrocytic glial filaments and glial fibrillary acidic protein were increased in density and expression, respectively. Together, the CNS neuronal alterations in klotho mutant mice were quite similar to those found in aged animals, including even premature death, so this mouse should be a more appropriate animal model for CNS aging than those previously reported.
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Research Support, Non-U.S. Gov't |
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Shiozaki K, Shiozaki M, Russell P. Heat stress activates fission yeast Spc1/StyI MAPK by a MEKK-independent mechanism. Mol Biol Cell 1998; 9:1339-49. [PMID: 9614178 PMCID: PMC25354 DOI: 10.1091/mbc.9.6.1339] [Citation(s) in RCA: 94] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
Fission yeast Spc1/StyI MAPK is activated by many environmental insults including high osmolarity, oxidative stress, and heat shock. Spc1/StyI is activated by Wis1, a MAPK kinase (MEK), which is itself activated by Wik1/Wak1/Wis4, a MEK kinase (MEKK). Spc1/StyI is inactivated by the tyrosine phosphatases Pyp1 and Pyp2. Inhibition of Pyp1 was recently reported to play a crucial role in the oxidative stress and heat shock responses. These conclusions were based on three findings: 1) osmotic, oxidative, and heat stresses activate Spc1/StyI in wis4 cells; 2) oxidative stress and heat shock activate Spc1/StyI in cells that express Wis1AA, in which MEKK consensus phosphorylation sites were replaced with alanine; and 3) Spc1/StyI is maximally activated in Deltapyp1 cells. Contrary to these findings, we report: 1) Spc1/StyI activation by osmotic stress is greatly reduced in wis4 cells; 2) wis1-AA and Deltawis1 cells have identical phenotypes; and 3) all forms of stress activate Spc1/StyI in Deltapyp1 cells. We also report that heat shock, but not osmotic or oxidative stress, activate Spc1 in wis1-DD cells, which express Wis1 protein that has the MEKK consensus phosphorylation sites replaced with aspartic acid. Thus osmotic and oxidative stress activate Spc1/StyI by a MEKK-dependent process, whereas heat shock activates Spc1/StyI by a novel mechanism that does not require MEKK activation or Pyp1 inhibition.
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Nishio E, Fukushima K, Shiozaki M, Watanabe Y. Nitric oxide donor SNAP induces apoptosis in smooth muscle cells through cGMP-independent mechanism. Biochem Biophys Res Commun 1996; 221:163-8. [PMID: 8660329 DOI: 10.1006/bbrc.1996.0563] [Citation(s) in RCA: 80] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Recent evidence suggests that nitric oxide (NO) may function as a second messenger in the intracellular signal transduction pathways. We explored the possibility that NO was involved in the signal for triggering apoptosis in smooth muscle cells (SMCs). Chemical NO donors induced SMCs apoptosis in a concentration- and time-dependent manner. The membrane-permeable cGMP analogue, dibutyryl-cGMP, did not induce SMCs apoptosis, and the highly selective inhibitor of cGMP-dependent protein kinase, KT5823, was unable to inhibit the induction of NO-induced SMCs apoptosis. Inhibitor of ADP-ribosyltransferase slightly attenuated the induction of SMCs apoptosis by S-nitroso-N-acetyl penicillamine (SNAP). The inhibitor of Na+-H+ antiporter, amiloride, completely inhibited the induction of SMCs apoptosis by SNAP. These results demonstrate for the first time that NO can induce apoptosis in SMCs, suggesting that NO acts as a mediator in the development of atherosclerosis lesion via alterations in the number of SMCs. In addition, the results suggest that NO exert these effects through a pathway that does not involve guanylate cyclase and cGMP-dependent protein kinase.
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29 |
80 |
6
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Shiozaki M, Sakai R, Tabuchi M, Nakamura T, Sugino K, Sugino H, Eto Y. Evidence for the participation of endogenous activin A/erythroid differentiation factor in the regulation of erythropoiesis. Proc Natl Acad Sci U S A 1992; 89:1553-6. [PMID: 1542647 PMCID: PMC48490 DOI: 10.1073/pnas.89.5.1553] [Citation(s) in RCA: 75] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022] Open
Abstract
Activin A/erythroid differentiation factor (EDF) is a human protein that induces differentiation of a murine erythroleukemia cell (the Friend cell). In this study, we demonstrate that endogenous activin A/EDF activity is present in murine bone marrow and spleen. In addition, this activity is secreted by bone marrow and spleen cells in primary culture. Administration of follistatin (a specific binding protein for activin A/EDF) to mice results in a decrease of erythroid progenitors in the bone marrow and spleen. These findings support the concept that activin A/EDF and follistatin have opposing actions in the regulation of erythropoiesis.
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Nakagawa Y, Morikawa H, Hirata I, Shiozaki M, Matsumoto A, Maemura K, Nishikawa T, Niki M, Tanigawa N, Ikegami M, Katsu K, Akao Y. Overexpression of rck/p54, a DEAD box protein, in human colorectal tumours. Br J Cancer 1999; 80:914-7. [PMID: 10360675 PMCID: PMC2362290 DOI: 10.1038/sj.bjc.6690441] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
The RCK gene is a target of the t(11;14)(q23;q32) chromosomal translocation observed in human B-cell lymphoma, and the overexpression of its protein (rck/p54) by the translocation was shown to cause malignant transformation. The rck/p54 protein belongs to the DEAD box protein/RNA helicase family, which has a variety of functions such as translation initiation, pre-mRNA splicing and ribosome assembly. The expression of rck p54 in colorectal adenocarcinoma cells was examined by immunohistochemistry and Western blot analysis. The rck/p54 protein was found to be overexpressed in tumour tissues resected from 13 (50%) out of 26 cases of colorectal adenocarcinomas and two out of two (100%) cases of colonic severe dysplastic adenomas. In view of activities of rck/p54 determined in other tissue types, we suggest that rck/p54 may contribute to the cell proliferation and carcinogenesis at the translational level in the development of colorectal tumours.
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research-article |
26 |
60 |
8
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Tashiro M, Hashino K, Shiozaki M, Ibuki F, Maki Z. The complete amino acid sequence of rice bran trypsin inhibitor. J Biochem 1987; 102:297-306. [PMID: 3667571 DOI: 10.1093/oxfordjournals.jbchem.a122054] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023] Open
Abstract
The complete amino acid sequence of a double-headed trypsin inhibitor (RBTI) from rice bran was determined by a combination of limited proteolysis of the native inhibitor with Streptomyces griseus trypsin at pH 3 and conventional methods. RBTI consists of 133 amino acid residues including 18 half-cystine residues which are involved in 9 disulfide bridges in the molecule. The limited proteolysis at pH 3 produced a major split of Lys(83)-Met(84) and a minor split of Arg(107)-Val(108) together with a non-enzymatic hydrolysis of Asp(19)-Pro(20) in the molecule. The established sequence showed that RBTI is composed of 4 domains, domains I and III, and domains II and IV being homologous to the first and the second domains of soybean Bowman-Birk inhibitor, respectively, indicating that RBTI has a duplicated structure of the Bowman-Birk type inhibitor.
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38 |
45 |
9
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Oguma K, Iida H, Shiozaki M, Inoue K. Antigenicity of converting phages obtained from Clostridium botulinum types C and D. Infect Immun 1976; 13:855-60. [PMID: 773828 PMCID: PMC420688 DOI: 10.1128/iai.13.3.855-860.1976] [Citation(s) in RCA: 39] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Phage conversion of toxigenicity in Clostridium botulinum types C and D was accomplished by using nontoxigenic strains and phages purified from plaques. Although the morphology of the converting phages seemed to be the same, they were divided into three groups on the basis of their conversion spectrum. The first group consists of phages obtained from toxogenic strains C-Stockholm and C-468. The second group consists of phages from strains D-1873 and C-203. The third group consists of phages from strains D-South African and D-4947. These converting phages were also classified into the same three groups by a neutralization test with specific antiphage sera. Cross-neutralization, however, was observed between phages belonging to group 1 and group 2,by both the neutralization test of converting ability and by a plaque experiment in which the surviving rates of phages were calculated after treatment with each antiphage serum. The antigenic differences among these converting phages should probably comprise one of the reasons for the existence of the specific infection spectrum in C. botulinum types C and D.
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49 |
39 |
10
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Oguma K, Iida H, Shiozaki M. Phage conversion to hemagglutinin production in Clostridium botulinum types C and D. Infect Immun 1976; 14:597-602. [PMID: 786888 PMCID: PMC420926 DOI: 10.1128/iai.14.3.597-602.1976] [Citation(s) in RCA: 37] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Five toxigenic strains of Clostridium botulinum types C and D were incubated at 37 degrees C for 7 days in 15 ml of the following media: LYG medium, cooked-meat medium, egg meat medium, and N-Z-amine medium. The supernatants of these cultures were tested for hemagglutinin production with 1% erythrocytes obtained from mice, guinea pigs, chickens, sheep, monkeys, and humans. Four toxigenic strains produced hemagglutinin. The highest hemagglutinin titer was obtained with a combination of human erythrocytes and cultures incubated in LYG medium. When the same experiment was carried out with many nontoxigenic strains, hemagglutination was observed in only one strain, C-N71. Strains producing hemagglutinin also produced phages. The phages obtained from toxin- and hemagglutinin-producing strains converted nontoxigenic indicator strains to produce both toxin and hemagglutinin. The phage obtained from a toxin-positive hemagglutinin-negative strain could only induce cultures to produce toxin, and the phage from a toxin-negative hemagglutinin-positive strain could only induce production of hemagglutinin. These studies suggest that the production of hemagglutinin by C. botulinum types C and D is governed by bacteriophages and that hemagglutinin production can be transmitted separately or concomitantly with toxin production.
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49 |
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11
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Shiozaki M, Sakai R, Tabuchi M, Eto Y, Kosaka M, Shibai H. In vivo treatment with erythroid differentiation factor (EDF/activin A) increases erythroid precursors (CFU-E and BFU-E) in mice. Biochem Biophys Res Commun 1989; 165:1155-61. [PMID: 2610684 DOI: 10.1016/0006-291x(89)92723-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
The in vivo effect of human EDF on erythroid precursors (CFU-E and BFU-E) was investigated in normal and bled mice. In anemic (bled) mice, EDF treatment led to significant dose-dependent rises in the CFU-E and BFU-E levels of bone marrow. An elevation in the level of CFU-E was also seen in the spleen. In normal mice, a significant elevation in the level of bone marrow BFU-E was observed. Thus, EDF has an effect on erythropoiesis in anemic and normal mice in vivo.
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12
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Shiozaki M, Hirai K, Dohke R, Morita T, Miyashita M, Sato K, Tsuneto S, Shima Y, Uchitomi Y. Measuring the regret of bereaved family members regarding the decision to admit cancer patients to palliative care units. Psychooncology 2008; 17:926-31. [DOI: 10.1002/pon.1312] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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13
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Shiozaki M, Inoue K, Suwa S, Lee CC, Chikata Y, Ishiura J, Kimura Y, Fukuda K, Tamura H, Fujiwara Y, Sumiyoshi M, Daida H. Utility of the 0-hour/1-hour high-sensitivity cardiac troponin T algorithm in Asian patients with suspected non-ST elevation myocardial infarction. Int J Cardiol 2017; 249:32-35. [PMID: 28986063 DOI: 10.1016/j.ijcard.2017.09.009] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/13/2017] [Revised: 08/02/2017] [Accepted: 09/07/2017] [Indexed: 10/18/2022]
Abstract
BACKGROUND A rapid rule-out or rule-in protocol based on the 0-hour/1-hour algorithm using high-sensitivity cardiac troponin T is recommended by the European Society of Cardiology. However, Asian data are not available. METHODS This prospective cohort study included 413 patients with suspected non-ST elevation myocardial infarction in 3 hospitals in Japan and Taiwan from November 2014 to April 2017. Patients were divided into 3groups-rule-out, observe, and rule-in-according to the algorithm. Major adverse cardiovascular events were evaluated at the 30-dayfollow-up. RESULTS The algorithm ruled out acute myocardial infarction (AMI) in 171 patients with a negative predictive value and sensitivity of 100% (95% confidential interval [CI], 96.8%-100%) and 100% (95% CI, 88.0%-100%), respectively, in the rule-out group. None of the patients were diagnosed with AMI. Among the 127 patients classified into the rule-in group, 47 were diagnosed as having AMI. The positive predictive value and specificity were 33.1% (95% CI, 25.1%-41.9%) and 66.3% (95% CI, 60.2%-72.0%), respectively. Elective catheter intervention was required in 13 patients (5 in the rule-out group, 8 in the observe group) by the 30-dayfollow-up. The Framingham Risk Score (FRS) identified moderate risk in 5 patients and high risk in 8, while the Global Registry of Acute Coronary Events (GRACE) 2.0 risk score identified low risk in 6 patients and moderate risk in 7. CONCLUSION The ESC0-hour/1-hour algorithm could be sufficient in Asian patients. The combination with FRS may be more precise than that with the GRACE 2.0 risk score.
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Multicenter Study |
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26 |
14
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Shiozaki M, Kosaka M, Eto Y. Activin A: a commitment factor in erythroid differentiation. Biochem Biophys Res Commun 1998; 242:631-5. [PMID: 9464268 DOI: 10.1006/bbrc.1997.8020] [Citation(s) in RCA: 24] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Erythropoietin is known to be an essential hemopoietic growth factor for maturation of erythroid progenitor cells. Like other hemopoietic growth factors, erythropoietin acts as a survival factor that supports maturation of the erythroid progenitor through the suppression of apoptosis. It is unclear whether erythropoietin can also induce differentiation, or if another external regulator is needed to initiate this process. The present study using murine cell lines revealed that maturation of the erythroid lineage requires costimulation by activin A and erythropoietin. Erythropoietin alone dose not induce differentiation and cells stimulated by activin A alone undergo apoptotic death. Costimulation with erythropoietin and activin A, however, rescues the cells from apoptotic death and permits differentiation. Two-step cultivation showed that cells pretreated with activin A no longer need activin A and differentiate in the presence of erythropoietin alone. The action of activin A commits the cell to death or to differentiation, and the presence of erythropoietin enables differentiation through suppression of apoptosis.
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27 |
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15
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Mori K, Shiozaki M, Itaya N, Matsui M, Sumiki Y. Synthesis of substances related to gibberellins—XXI. Tetrahedron 1969. [DOI: 10.1016/s0040-4020(01)82702-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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56 |
23 |
16
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Hirai K, Motooka H, Ito N, Wada N, Yoshizaki A, Shiozaki M, Momino K, Okuyama T, Akechi T. Problem-Solving Therapy for Psychological Distress in Japanese Early-stage Breast Cancer Patients. Jpn J Clin Oncol 2012; 42:1168-74. [DOI: 10.1093/jjco/hys158] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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17
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Ogawa R, Ishiguro H, Kimura M, Funahashi H, Wakasugi T, Ando T, Shiozaki M, Takeyama H. NOTCH1 expression predicts patient prognosis in esophageal squamous cell cancer. Eur Surg Res 2013; 51:101-7. [PMID: 24217574 DOI: 10.1159/000355674] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Accepted: 09/17/2013] [Indexed: 11/19/2022]
Abstract
PURPOSE The prognosis of patients with esophageal cancer remains poor, and the classification of tumor node metastasis has proven insufficient to predict patient prognosis. Therefore, novel predictive markers of esophageal cancer prognosis are needed. Notch receptors and their ligands have been reported to be upregulated in cervical, lung, colon, renal, and pancreatic cancers, but NOTCH1 expression has not been studied in esophageal cancer. METHODS Expression of NOTCH1 was quantified by real-time reverse transcription-polymerase chain reaction in 55 primary esophageal squamous cell carcinomas (ESCCs) and their paired normal esophageal mucosa. We then examined the correlations between NOTCH1 expression, clinicopathological factors, and prognosis in patients with ESCC. RESULTS The probability of overall survival was significantly lower for patients with high NOTCH1 expression (p = 0.0028; log-rank test). Overexpression of NOTCH1 was identified as a significant and independent prognostic factor (p = 0.0061) in patients who had undergone surgical treatment for ESCCs. The hazard ratio for predicting early death was 4.298 (95% confidence interval 1.515-12.195) for high versus low NOTCH1 expression. CONCLUSIONS Our data indicate that NOTCH1 may be a candidate molecular prognostic marker and a molecular target for the development of an effective therapeutic intervention for patients with ESCC.
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Journal Article |
12 |
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Ikeda H, Shiozaki M. Nonhomologous recombination mediated by Escherichia coli DNA gyrase: possible involvement of DNA replication. COLD SPRING HARBOR SYMPOSIA ON QUANTITATIVE BIOLOGY 1984; 49:401-9. [PMID: 6099249 DOI: 10.1101/sqb.1984.049.01.046] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
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41 |
19 |
19
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Murata T, Saito S, Shiozaki M, Lu RZ, Eto Y, Funaba M, Takahashi M, Torii K. Anti-activin A antibody (IgY) specifically neutralizes various activin A activities. PROCEEDINGS OF THE SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE. SOCIETY FOR EXPERIMENTAL BIOLOGY AND MEDICINE (NEW YORK, N.Y.) 1996; 211:100-7. [PMID: 8594613 DOI: 10.3181/00379727-211-43958] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
Activin A (beta A beta A), originally isolated from ovarian follicular fluids as a follicule-stimulating hormone (FSH) secretion stimulator, has also been identified as an erythroid differentiation factor (EDF), a neuron survival factor and a mesoderm-inducing factor. Thus, activin A is a multifunctional factor, and further studies on its physiological function are important. However, it is very difficult to produce a specific antibody to neutralize the activity of activin A because of its highly conserved amino acid sequence across mammalian species. In this study, we succeeded in generating an antibody against activin A, which can neutralize several activities of activin A, such as the stimulation of FSH secretion from pituitary cells and the induction of the differentiation of erythrocytes in vitro. This antibody did not affect the activity of activin B (beta B beta B), which induces the differentiation of erythrocytes in vitro, and the activity of inhibin A (alpha beta A), which inhibits FSH secretion from pituitary in vitro, but slightly neutralized that of activin AB (beta A beta B). Western blotting analysis showed that this antibody recognized both dimeric and monomeric forms of the beta A subunit of activin and inhibin. These results suggest that this antibody recognizes the beta A subunit of activin and specifically neutralizes the activity of a dimer of the beta A subunit, activin A. Furthermore, by the addition of this antibody to the culture medium, the development of murine embryos was suppressed, suggesting that endogenous activin A plays an important role in murine development. These results indicate the usefulness of this antibody for studies of endogenous activin actions.
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Shiozaki M, Mori K, Matsui M, Hiraoka T. Photochemical synthesis of compounds with grayanotoxin skeleton. Tetrahedron Lett 1972. [DOI: 10.1016/s0040-4039(01)84403-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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53 |
15 |
21
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Shiozaki M, Kobayashi Y, Ishida N, Arai M, Hiraoka T, Nishijima M, Kuge S, Otsuka T, Akamatsu Y. Synthesis of 2-deoxy-2-[(3R)-3-hydroxytetradecanamido]-3-O-[(3R)-3- hydroxytetradecanyl]-alpha-D-glucopyranosyl dihydrogen phosphate and 2-deoxy-2-[(3R)-3-hydroxytetradecanamido]-3-O-[(3R)-3- hydroxytetradecanyl]-4-O-phosphono-D-glucopyranose. Carbohydr Res 1991; 222:57-68. [PMID: 1813112 DOI: 10.1016/0008-6215(91)89006-2] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Comparative Study |
34 |
15 |
22
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Okubo M, Yamashita T, Shiozaki M. Thermodynamics of high swelling of polymer particles with a large amount of monomer utilizing the dynamic swelling method. J Appl Polym Sci 1996. [DOI: 10.1002/(sici)1097-4628(19960516)60:7<1025::aid-app13>3.0.co;2-#] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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23
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Shiozaki M, Deguchi N, Macindoe WM, Arai M, Miyazaki H, Mochizuki T, Tatsuta T, Ogawa J, Maeda H, Kurakata S. Syntheses of 1-O-carboxyalkyl GLA-60 analogues. Carbohydr Res 1996; 283:27-51. [PMID: 8901261 DOI: 10.1016/0008-6215(95)00402-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
As part of our ongoing study to survey potent LPS antagonists, the following six compounds were synthesized in an efficient manner: 3-carboxypropyl and carboxymethyl 2-deoxy-2-(2,2-difluorotetradecanamido)-4-O-phosphono-3-O-[(R)-3- (tetradecanoyloxy)tetradecanoyl]-alpha- and beta-D-glucopyranosides (11 and 23; 32 and 36), as well as the non-fluorinated equivalents, carboxymethyl 2-deoxy-4-O-phosphono-2-tetradecanamido-3-O-[(R)-3-(tetradecano yloxy)- tetradecanoyl]-alpha-D-glucopyranoside (44) and carboxymethyl 2-deoxy-2-[(R)-3-(hydroxy)tetradecanamido]-4-O-phosphono-3-O-[(R)- 3- (tetradecanoyloxy)tetradecanoyl]-alpha-D-glucopyranoside (48). Of these compounds, 32 was most pronounced in terms of LPS-antagonistic activity.
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Abstract
Synthesis of trehazolin beta-anomer (3) from a D-glucose derived azido alcohol (4), was accomplished. 2-Chloro-1-methylpyridinium iodide was used in place of 2-chloro-3-ethylbenzoxazolium tetrafluoroborate as a means of preventing concomitant anomerization. Evaluation of compound (3) reveals that the stereochemistry of the anomeric position is significant for generation of inhibitory activities towards trehalases.
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Akechi T, Hirai K, Motooka H, Shiozaki M, Chen J, Momino K, Okuyama T, Furukawa TA. Problem-Solving Therapy for Psychological Distress in Japanese Cancer Patients: Preliminary Clinical Experience from Psychiatric Consultations. Jpn J Clin Oncol 2008; 38:867-70. [DOI: 10.1093/jjco/hyn115] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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