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Kamali S, Zha CL, Yoda Y, Akerman J. Oxidation states and the quality of lower interfaces in magnetic tunnel junctions: oxygen effect on crystallization of interfaces. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2013; 25:135302. [PMID: 23470360 DOI: 10.1088/0953-8984/25/13/135302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Lower interfaces in magnetic tunnel junctions (MTJs), which are the basic components in many spintronic devices such as magnetoresistive random access memories, have crucial effects on the performance of these devices. To obtain more insight into such interfaces, we have introduced an ultrathin sensor layer of (57)Fe at the interface between the lower electrode and the oxide barrier in selected MTJs. This allowed us to perform nuclear resonant scattering measurements, which provide direct information on the magnetic properties and quality of the interfaces. The application of nuclear resonant scattering to study interfaces in MTJs is a unique approach in the sense that it gives information at the atomic level, and specifically from the interface where the sensor layer is deposited. Samples with different tunnel barrier thicknesses and varied oxidation times in the preparation of this barrier have been studied. These show that oxidation can not only increase the magnetic hyperfine fields but also cause an interesting smoothing and crystallizing of the interface. Another interesting finding is the observation of boron diffusion into the lower part of the FeCoB lower electrode towards the Ta seed layer.
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Kim JG, Takeshima H, Niwa T, Rehnberg E, Shigematsu Y, Yoda Y, Yamashita S, Kushima R, Maekita T, Ichinose M, Katai H, Park WS, Hong YS, Park CH, Ushijima T. Comprehensive DNA methylation and extensive mutation analyses reveal an association between the CpG island methylator phenotype and oncogenic mutations in gastric cancers. Cancer Lett 2012. [PMID: 23196062 DOI: 10.1016/j.canlet.2012.11.022] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Recent development of personal sequencers for extensive mutation analysis and bead array technology for comprehensive DNA methylation analysis have made it possible to obtain integrated pictures of genetic and epigenetic alterations on the same set of cancer samples. Here, we aimed to establish such pictures of gastric cancers (GCs). Comprehensive methylation analysis of 30 GCs revealed that the number of aberrantly methylated genes was highly variable among individual GCs. Extensive mutation analysis of 55 known cancer-related genes revealed that 19 of the 30 GCs had 24 somatic mutations of eight different genes (CDH1, CTNNB1, ERBB2, KRAS, MLH1, PIK3CA, SMARCB1, and TP53). Integration of information on the genetic and epigenetic alterations revealed that the GCs with the CpG island methylator phenotype (CIMP) tended to have mutations of oncogenes, CTNNB1, ERBB2, KRAS, and PIK3CA. This is one of the first studies in which both genetic and epigenetic alterations were extensively analyzed in the same set of samples. It was also demonstrated for the first time in GCs that the CIMP was associated with oncogene mutations.
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Yoda Y, Ohashi M. A Case of Composite Hemangioendothelioma Arising from the Spleen. Jpn J Clin Oncol 2012; 42:770. [DOI: 10.1093/jjco/hys118] [Citation(s) in RCA: 9] [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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29
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Matsuoka T, Fujihisa H, Hirao N, Ohishi Y, Mitsui T, Masuda R, Seto M, Yoda Y, Shimizu K, Machida A, Aoki K. Structural and valence changes of europium hydride induced by application of high-pressure H₂. PHYSICAL REVIEW LETTERS 2011; 107:025501. [PMID: 21797616 DOI: 10.1103/physrevlett.107.025501] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2011] [Indexed: 05/31/2023]
Abstract
Europium hydride EuH(x), when exposed to high-pressure H₂, has been found to exhibit the following structural and valence changes: Pnma(x = 2, divalent) → P6₃/mmc(x = 2, 7.2-8.7 GPa) → I4/m(x > 2, 8.7-9.7 GPa) → I4/mmm(x > 2, 9.7 GPa-,trivalent). With a trivalent character and a distorted cubic fcc structure, the I4/mmm structure is the β phase commonly observed for other rare-earth metal hydrides. Our study clearly demonstrates that EuH(x) is no longer an irregular member of the rare-earth metal hydrides.
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Yoda Y, Amagase K, Kato S, Tokioka S, Murano M, Kakimoto K, Nishio H, Umegaki E, Takeuchi K, Higuchi K. Prevention by lansoprazole, a proton pump inhibitor, of indomethacin -induced small intestinal ulceration in rats through induction of heme oxygenase-1. JOURNAL OF PHYSIOLOGY AND PHARMACOLOGY : AN OFFICIAL JOURNAL OF THE POLISH PHYSIOLOGICAL SOCIETY 2010; 61:287-294. [PMID: 20610858] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Received: 01/19/2010] [Accepted: 03/25/2010] [Indexed: 05/29/2023]
Abstract
The effect of lansoprazole, a proton pump inhibitor (PPI), on indomethacin-induced small intestinal ulceration was examined in rats, particularly in relation to heme oxygenase (HO)-1. The animals were administered indomethacin (10 mg/kg, p.o.) and killed 24 h later. Lansoprazole (30-100 mg/kg, p.o.) and omeprazole (30-100 mg/kg, p.o.) were given 30 min before the administration of indomethacin, while tin-protoporphyrin IX (SnPP: 30 mg/kg, i.v.), an inhibitor of HO-1, was injected 10 min before indomethacin or lansoprazole. Indomethacin produced hemorrhagic lesions in the small intestine, accompanied with an increase of mucosal invasion of enterobacteria, inducible nitric oxide synthase (iNOS) expression, and myeloperoxidase (MPO) activity in the mucosa. Pretreatment with lansoprazole dose- dependently reduced the severity of the indomethacin-induced intestinal lesions, with suppression of the increased MPO activity, while omeprazole had no effect. Pretreatment with SnPP significantly exacerbated these intestinal lesions and almost totally abolished the protective effect of lansoprazole. The up-regulation of iNOS mRNA expression following indomethacin was suppressed by lansoprazole in a SnPP-inhibitable manner, although the enhanced enterobacterial invasion remained unaffected. The amount of HO-1 protein in the intestinal mucosa was significantly increased by lansoprazole but not by omeprazole. Prior administration of carbon monoxide (CO)-releasing molecule-2 (CORM-2; 10 mg/kg, i.p.) significantly reduced the severity of these lesions and the enhancement of mucosal iNOS mRNA expression induced in the small intestine by indomethacin. These results suggest that lansoprazole prevents indomethacin-induced small intestinal ulceration, and this effect is associated with inhibition of iNOS expression, through up-regulation of HO-1/CO production in the mucosa.
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Seto M, Masuda R, Higashitaniguchi S, Kitao S, Kobayashi Y, Inaba C, Mitsui T, Yoda Y. Mössbauer spectroscopy in the energy domain using synchrotron radiation. ACTA ACUST UNITED AC 2010. [DOI: 10.1088/1742-6596/217/1/012002] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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32
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Sasaki T, Yamamoto K, Onishi T, Sugiyama A, Tomizawa T, Yoda Y. Sheet Transport Simulation for Electrostatic Transfer Process in Electrophotography. J Imaging Sci Technol 2010. [DOI: 10.2352/j.imagingsci.technol.2010.54.3.030504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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Sasaki T, Onishi T, Sugiyama A, Nasu S, Yoda Y, Tomizawa T. Transfer Process Multiphysics Simulation in Electrophotography. J Imaging Sci Technol 2010. [DOI: 10.2352/j.imagingsci.technol.2010.54.3.030505] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
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34
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Osumi W, Fujita Y, Hiramatsu M, Kawai M, Sumiyoshi K, Umegaki E, Tokioka S, Yoda Y, Egashira Y, Abe S, Higuchi K, Tanigawa N. Endoscopic submucosal dissection allows less-invasive curative resection for gastric tube cancer after esophagectomy - a case series. Endoscopy 2009; 41:777-80. [PMID: 19746318 DOI: 10.1055/s-0029-1215024] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Detection of early gastric tube cancers (GTCs) has increased with more detailed surveillance endoscopy using indigo carmine dye following esophagectomy. This retrospective study clarified the clinicopathological features and application of endoscopic submucosal dissection (ESD) for GTCs. Data collected for eight GTCs treated by ESD included clinical and pathological features and outcomes following ESD. Overall, eight GTCs were identified in seven (6.3 %) of 112 patients who underwent esophagectomy and gastric tube reconstruction. Almost all lesions were macroscopically type 0-IIa with mucosal to submucosal invasion, and seven GTCs were successfully resected en bloc by ESD. Submucosal invasion to > 500 microm was observed in one case with associated delayed perforation that was treated conservatively. No local recurrences of GTCs were observed. Detailed surveillance endoscopy using indigo carmine dye appears useful for diagnosing early-stage GTC. Furthermore ESD represents a feasible alternative to conventional endoscopic mucosal resection as a minimally invasive therapy for early-stage GTC.
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Matsuyama S, Sato S, Yoda Y, Kai K, Mitsuno M, Nakafusa Y, Miyazaki K. Ethanol injection for ablation of an intractable digestive tract fistula: report of a case. Surg Today 2007; 36:744-6. [PMID: 16865522 DOI: 10.1007/s00595-006-3238-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/22/2005] [Accepted: 01/17/2006] [Indexed: 02/05/2023]
Abstract
We successfully occluded an intractable digestive tract fistula by injecting it with absolute ethanol after all other treatments failed. A 48-year-old man suffered from a complex and relapsing digestive tract fistula after curative surgery for advanced colon cancer invading the pancreas and duodenum. After conservative management by fasting, drainage, and irrigation failed, fibrin glue infusion achieved only transient occlusion. We performed surgical repair and he was discharged from hospital, at which time fistulography showed no fistula. However, 1 month later fistulography showed that the fistula had recurred and involved the transverse colon, stomach, and intrahepatic bile duct via the jejunum. Finally, we gave five injections of absolute ethanol into the fistula, which resulted in complete occlusion within 6 months. Considering its clinical efficacy, safety, and cost efficiency, we think that ethanol sclerotherapy is a feasible treatment for intractable digestive tract fistula when conservative therapy fails.
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Yabashi M, Goto S, Shimizu Y, Tamasaku K, Yamazaki H, Yoda Y, Suzuki M, Ohishi Y, Yamamoto M, Ishikawa T. Diamond Double-Crystal Monochromator for SPring-8 Undulator Beamlines. ACTA ACUST UNITED AC 2007. [DOI: 10.1063/1.2436212] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
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37
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Matsuyama S, Nakafusa Y, Tanaka M, Yoda Y, Mori D, Miyazaki K. Iliac lymph node metastasis of an unknown primary tumor: report of a case. Surg Today 2006; 36:655-8. [PMID: 16794805 DOI: 10.1007/s00595-006-3211-z] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2005] [Accepted: 11/15/2005] [Indexed: 11/26/2022]
Abstract
Metastasis to the lymph nodes around the iliac vessels from cancer of an unknown primary (CUP) tumor has not yet been reported in either the English or Japanese literature and it is therefore described herein for the first time. The patient was a 70-year-old woman with persistent right leg edema. Computed tomography (CT) displayed a mass around the iliac vessels while physical, laboratory, and other imaging examination did not show any other tumor. Preoperatively diagnosed as a retroperitoneal tumor, the patient underwent a tumor resection, but a histopathological examination revealed the tumor to be poorly differentiated squamous cell carcinoma. Only residual lymph nodes in the pelvis were detected by postoperative fluorine-18 fluorodeoxyglucose-positron emission tomography. Neither a primary lesion nor any signs of recurrence were demonstrated for 13 months after radiotherapy for the residual nodes. We herein discuss the diagnosis, treatment, and follow-up of this less common CUP.
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Xiao Y, Wang H, George SJ, Smith MC, Adams MWW, Jenney FE, Sturhahn W, Alp EE, Zhao J, Yoda Y, Dey A, Solomon EI, Cramer SP. Normal Mode Analysis of Pyrococcus furiosus Rubredoxin via Nuclear Resonance Vibrational Spectroscopy (NRVS) and Resonance Raman Spectroscopy. J Am Chem Soc 2005; 127:14596-606. [PMID: 16231912 DOI: 10.1021/ja042960h] [Citation(s) in RCA: 64] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We have used (57)Fe nuclear resonance vibrational spectroscopy (NRVS) to study the Fe(S(cys))(4) site in reduced and oxidized rubredoxin (Rd) from Pyrococcus furiosus (Pf). The oxidized form has also been investigated by resonance Raman spectroscopy. In the oxidized Rd NRVS, strong asymmetric Fe-S stretching modes are observed between 355 and 375 cm(-1); upon reduction these modes shift to 300-320 cm(-1). This is the first observation of Fe-S stretching modes in a reduced Rd. The peak in S-Fe-S bend mode intensity is at approximately 150 cm(-1) for the oxidized protein and only slightly lower in the reduced case. A third band occurs near 70 cm(-1) for both samples; this is assigned primarily as a collective motion of entire cysteine residues with respect to the central Fe. The (57)Fe partial vibrational density of states (PVDOS) were interpreted by normal mode analysis with optimization of Urey-Bradley force fields. The three main bands were qualitatively reproduced using a D(2)(d) Fe(SC)(4) model. A C(1) Fe(SCC)(4) model based on crystallographic coordinates was then used to simulate the splitting of the asymmetric stretching band into at least 3 components. Finally, a model employing complete cysteines and 2 additional neighboring atoms was used to reproduce the detailed structure of the PVDOS in the Fe-S stretch region. These results confirm the delocalization of the dynamic properties of the redox-active Fe site. Depending on the molecular model employed, the force constant K(Fe-S) for Fe-S stretching modes ranged from 1.24 to 1.32 mdyn/A. K(Fe-S) is clearly diminished in reduced Rd; values from approximately 0.89 to 1.00 mdyn/A were derived from different models. In contrast, in the final models the force constants for S-Fe-S bending motion, H(S-Fe-S), were 0.18 mdyn/A for oxidized Rd and 0.15 mdyn/A for reduced Rd. The NRVS technique demonstrates great promise for the observation and quantitative interpretation of the dynamical properties of Fe-S proteins.
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Takahashi T, Nojima A, Nodumi Y, Yoda Y. Parametric down conversion of X-rays under the dynamical diffraction condition. Acta Crystallogr A 2005. [DOI: 10.1107/s0108767305081717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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40
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Anzai Y, Ishii Y, Yoda Y, Kinoshita K, Kato F. The targeted inactivation of polyketide synthase mycAV in the mycinamicin producer, Micromonospora griseorubida, and a complementation study. FEMS Microbiol Lett 2005; 238:315-20. [PMID: 15358416 DOI: 10.1016/j.femsle.2004.07.050] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2004] [Revised: 07/19/2004] [Accepted: 07/20/2004] [Indexed: 11/27/2022] Open
Abstract
Mycinamicin is a 16-membered macrolide antibiotic produced by Micromonospora griseorubida A11725, which shows strong antimicrobial activity against gram-positive bacteria. Recently, the nucleotide sequences of the mycinamicn biosynthetic gene cluster in M. griseorubida have been completely determined. Mycinamicin non-producer M7A21 was isolated by mycAV inactivation, which encodes the module 7 of mycinamicin polyketide synthase (PKS) required for the biosynthesis of the mycinamicin biosynthetic intermediate protomycinolide-IV (PML-IV). When the bioconversion to mycinamicin II (M-II) from PML-IV was performed using M7A21 and the feeding culture method, the productivity of M-II was the same as that of M-II in wild-type strain A11725. p446M7 containing mycAV was constructed using the Escherichia coli-Streptomyces shuttle vector pGM446. The mycinamicin productivity of M7A21 was restored by the introduction of p446M7 into the M7A21 cell, but almost all p446M7 was integrated into the chromosome of M7A21 because the plasmid was unstable in M7A21. The feeding culture and the introduction of the complement gene for M7A21 would be powerful tools to perform combinatorial biosynthesis for the production of new macrolide antibiotics.
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Collins C, Zoita N, Davanloo F, Emura S, Yoda Y, Uruga T, Patterson B, Schmitt B, Pouvesle J, Popescu I, Kirischuk V, Strilchuk N. Accelerated γ-emission from isomeric nuclei. Radiat Phys Chem Oxf Engl 1993 2004. [DOI: 10.1016/j.radphyschem.2004.04.033] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Anzai Y, Ishii Y, Yoda Y, Kinoshita K, Kato F. The targeted inactivation of polyketide synthasemycAVin the mycinamicin producer,Micromonospora griseorubida, and a complementation study. FEMS Microbiol Lett 2004. [DOI: 10.1111/j.1574-6968.2004.tb09772.x] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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43
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44
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Ito M, Nakamura M, Yoda Y, Sakata O, Takahashi T. Surface X-ray diffraction study of Cu UPD on Au(111) electrode in 0.5M H 2SO 4solution. Acta Crystallogr A 2002. [DOI: 10.1107/s010876730209880x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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46
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Yoda Y, Zhang XW, Seto M, Kitao S, Kikuta S. High-resolution monochromator for nuclear resonant scattering by 151Eu and 149Sm. Acta Crystallogr A 2002. [DOI: 10.1107/s0108767302091675] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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47
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Akahane Y, Yoda Y. [Cost-benefit of ultrasonographic mass screening for hepatocellular carcinoma]. NIHON RINSHO. JAPANESE JOURNAL OF CLINICAL MEDICINE 2001; 59 Suppl 6:791-4. [PMID: 11762058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
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48
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Kasama T, Kobayashi K, Yajima N, Shiozawa F, Yoda Y, Takeuchi HT, Mori Y, Negishi M, Ide H, Adachi M. Expression of vascular endothelial growth factor by synovial fluid neutrophils in rheumatoid arthritis (RA). Clin Exp Immunol 2000; 121:533-8. [PMID: 10971521 PMCID: PMC1905727 DOI: 10.1046/j.1365-2249.2000.01272.x] [Citation(s) in RCA: 47] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Most of the leucocytes infiltrating rheumatoid synovial fluid (SF) are neutrophils capable of producing a variety of inflammatory mediators known to contribute significantly to the disease process during active RA. In the present study, we investigated the contribution made by SF neutrophils to the elevated levels of vascular endothelial growth factor (VEGF) seen in rheumatoid SF. Rheumatoid SF neutrophils were found to contain significantly larger amounts of both VEGF protein and its mRNA than peripheral blood neutrophils from either RA patients or healthy controls. Levels of cell-associated VEGF were well correlated with free VEGF in SF, which was significantly higher than in SF from osteoarthritis patients. Levels of SF neutrophil-associated VEGF also correlated with RA disease activity and cell surface integrin expression. Thus, SF neutrophil-associated VEGF may be considered an indicator of both local and systemic inflammation of RA, contributing to the neovascularization seen during RA synovitis.
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Kishimoto S, Yoda Y, Seto M, Kobayashi Y, Kitao S, Haruki R, Kawauchi T, Fukutani K, Okano T. Observation of nuclear excitation by electron transition in 197Au with synchrotron X rays and an avalanche photodiode. PHYSICAL REVIEW LETTERS 2000; 85:1831-1834. [PMID: 10970625 DOI: 10.1103/physrevlett.85.1831] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/07/1999] [Indexed: 05/23/2023]
Abstract
We have succeeded in observing nuclear excitation by electron transition (NEET) in 197Au by a new method. Monochromatic x-rays of synchrotron radiation were used to ionize the K shell of gold atoms in a target foil. The internal-conversion electrons emitted from excited nuclei were detected with a silicon avalanche photodiode. At a photon energy of 80.989 keV, the NEET probability in 197Au was determined to be (5.0+/-0.6)x10(-8) from a comparison of the event number per photon between NEET and the nuclear resonance at 77.351 keV.
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50
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Lu J, Kasama T, Kobayashi K, Yoda Y, Shiozawa F, Hanyuda M, Negishi M, Ide H, Adachi M. Vascular endothelial growth factor expression and regulation of murine collagen-induced arthritis. JOURNAL OF IMMUNOLOGY (BALTIMORE, MD. : 1950) 2000; 164:5922-7. [PMID: 10820274 DOI: 10.4049/jimmunol.164.11.5922] [Citation(s) in RCA: 115] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
We have examined the expression and function of the angiogenic factor, vascular endothelial growth factor (VEGF) during the evolution of type II collagen-induced arthritis (CIA). Biologically active VEGF was expressed along a time course that paralleled the expression of two specific VEGF receptors, Flk-1 and Flt-1, and the progression of joint disease. Moreover, levels of VEGF expression correlated with the degree of neovascularization, as defined by vWF levels, and arthritis severity. Macrophage- and fibroblast-like cells, which infiltrated inflamed sites and were then activated by other inflammatory mediators, are probably important sources of VEGF and may thus regulate angiogenesis during the development of CIA. Administration of anti-VEGF antiserum to CIA mice before the onset of arthritis delayed the onset, reduced the severity, and diminished the vWF content of arthritic joints. By contrast, administration of anti-VEGF antiserum after the onset of the disease had no effect on the progression or ultimate severity of the arthritis. These data suggest that VEGF plays a crucial role during an early stage of arthritis development, affecting both neovascularization and the progression of experimentally induced synovitis.
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MESH Headings
- Animals
- Arthritis, Experimental/etiology
- Arthritis, Experimental/immunology
- Arthritis, Experimental/metabolism
- Arthritis, Experimental/physiopathology
- Cells, Cultured
- Collagen/immunology
- Endothelial Growth Factors/biosynthesis
- Endothelial Growth Factors/genetics
- Endothelial Growth Factors/immunology
- Endothelial Growth Factors/metabolism
- Endothelium, Vascular
- Humans
- Immune Sera/administration & dosage
- Immunization, Passive
- Immunohistochemistry
- Lymphokines/biosynthesis
- Lymphokines/genetics
- Lymphokines/immunology
- Lymphokines/metabolism
- Male
- Mice
- Mice, Inbred DBA
- Neovascularization, Physiologic/immunology
- Proto-Oncogene Proteins/genetics
- Receptor Protein-Tyrosine Kinases/genetics
- Receptors, Growth Factor/genetics
- Receptors, Vascular Endothelial Growth Factor
- Transcription, Genetic/immunology
- Umbilical Veins
- Vascular Endothelial Growth Factor A
- Vascular Endothelial Growth Factor Receptor-1
- Vascular Endothelial Growth Factors
- von Willebrand Factor/metabolism
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