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Izumi M, Yanagi K, Mizuno T, Yokoi M, Kawasaki Y, Moon KY, Hurwitz J, Yatagai F, Hanaoka F. The human homolog of Saccharomyces cerevisiae Mcm10 interacts with replication factors and dissociates from nuclease-resistant nuclear structures in G(2) phase. Nucleic Acids Res 2000; 28:4769-77. [PMID: 11095689 PMCID: PMC115166 DOI: 10.1093/nar/28.23.4769] [Citation(s) in RCA: 72] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2000] [Revised: 10/16/2000] [Accepted: 10/16/2000] [Indexed: 11/14/2022] Open
Abstract
Mcm10 (Dna43), first identified in Saccharomyces cerevisiae, is an essential protein which functions in the initiation of DNA synthesis. Mcm10 is a nuclear protein that is localized to replication origins and mediates the interaction of the Mcm2-7 complex with replication origins. We identified and cloned a human cDNA whose product was structurally homologous to the yeast Mcm10 protein. Human Mcm10 (HsMcm10) is a 98-kDa protein of 874 amino acids which shows 23 and 21% overall similarity to Schizosaccharomyces pombe Cdc23 and S. cerevisiae Mcm10, respectively. The messenger RNA level of HsMcm10 increased at the G(1)/S-boundary when quiescent human NB1-RGB cells were induced to proliferate as is the case of many replication factors. HsMcm10 associated with nuclease-resistant nuclear structures throughout S phase and dissociated from it in G(2) phase. HsMcm10 associated with human Orc2 protein when overexpressed in COS-1 cells. HsMcm10 also interacted with Orc2, Mcm2 and Mcm6 proteins in the yeast two-hybrid system. These results suggest that HsMcm10 may function in DNA replication through the interaction with Orc and Mcm2-7 complexes.
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102
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Izumi M, Vaughan OA, Hutchison CJ, Gilbert DM. Head and/or CaaX domain deletions of lamin proteins disrupt preformed lamin A and C but not lamin B structure in mammalian cells. Mol Biol Cell 2000; 11:4323-37. [PMID: 11102526 PMCID: PMC15075 DOI: 10.1091/mbc.11.12.4323] [Citation(s) in RCA: 71] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2000] [Revised: 09/22/2000] [Accepted: 10/05/2000] [Indexed: 11/11/2022] Open
Abstract
The nuclear lamina is an important determinant of nuclear architecture. Mutations in A-type but not B-type lamins cause a range of human genetic disorders, including muscular dystrophy. Dominant mutations in nuclear lamin proteins have been shown to disrupt a preformed lamina structure in Xenopus egg extracts. Here, a series of deletion mutations in lamins A and B1 were evaluated for their ability to disrupt lamina structure in Chinese hamster ovary cells. Deletions of either the lamin A "head" domain or the C-terminal CaaX domain formed intranuclear aggregates and resulted in the disruption of endogenous lamins A/C but not lamins B1/B2. By contrast, "head-less" lamin B1 localized to the nuclear rim with no detectable effect on endogenous lamins, whereas lamin B1 CaaX domain deletions formed intranuclear aggregates, disrupting endogenous lamins A/C but not lamins B1/B2. Filter binding assays revealed that a head/CaaX domain lamin B1 mutant interacted much more strongly with lamins A/C than with lamins B1/B2. Regulated induction of this mutant in stable cell lines resulted in the rapid elimination of all detectable lamin A protein, whereas lamin C was trapped in a soluble form within the intranuclear aggregates. In contrast to results in Xenopus egg extracts, dominant negative lamin B1 (but not lamin A) mutants trapped replication proteins involved in both the initiation and elongation phases of replication but did not effect cellular growth rates or the assembly of active replication centers. We conclude that elimination of the CaaX domain in lamin B1 and elimination of either the CaaX or head domain in lamin A constitute dominant mutations that can disrupt A-type but not B-type lamins, highlighting important differences in the way that A- and B-type lamins are integrated into the lamina.
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103
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Izumi M, Nakayama T, Uchinokura K, Harada S, Yoshizaki R, Matsuura E. Shubnikov-de Haas oscillations and Fermi surfaces in transition-metal pentatellurides ZrTe5and HfTe5. ACTA ACUST UNITED AC 2000. [DOI: 10.1088/0022-3719/20/24/011] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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104
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Nagamata H, Torii A, Izumi M, Anami M, Yamashita N, Inadama E, Toda G. [A case of Crohn's disease that shows the improvement of the gastric disorder by the administration of mesalazine powder]. NIHON SHOKAKIBYO GAKKAI ZASSHI = THE JAPANESE JOURNAL OF GASTRO-ENTEROLOGY 2000; 97:1261-6. [PMID: 11075590] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
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105
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Burkart MD, Izumi M, Chapman E, Lin CH, Wong CH. Regeneration of PAPS for the enzymatic synthesis of sulfated oligosaccharides. J Org Chem 2000; 65:5565-74. [PMID: 10970295 DOI: 10.1021/jo000266o] [Citation(s) in RCA: 81] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
This paper describes the study of 3'-phosphoadenosine-5'-phosphosulfate (PAPS) regeneration from 3'-phosphoadenosine-5'-phosphate (PAP) for use in practical syntheses of carbohydrate sulfates which are catalyzed by sulfotransferases. Among the regeneration systems, the one with recombinant aryl sulfotransferase proved to be the most practical. This regeneration system was coupled with a sulfotransferase-catalyzed reaction, using a recombinant Nod factor sulfotransferase, for the synthesis of various oligosaccharide sulfates that were further glycosylated using glycosyltransferases.
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106
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Izumi M, Hida A, Takagi Y, Kawabe Y, Eguchi K, Nakamura T. MR imaging of the salivary glands in sicca syndrome: comparison of lipid profiles and imaging in patients with hyperlipidemia and patients with Sjögren's syndrome. AJR Am J Roentgenol 2000; 175:829-34. [PMID: 10954475 DOI: 10.2214/ajr.175.3.1750829] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE We correlated abnormalities on MR imaging with the plasma lipid profiles of patients with hyperlipidemia and symptoms of sicca syndrome. SUBJECTS AND METHODS MR imaging features of the salivary glands, salivary function, immunologic abnormalities, and plasma lipid profiles were analyzed in 24 patients with hyperlipidemia and symptoms of sicca syndrome and compared with those of 50 patients with Sjögren's syndrome. RESULTS Swelling of the parotid gland, impaired salivary flow, or both were observed in 20 (83%) of 24 patients with hyperlipidemia and symptoms of sicca syndrome. MR imaging findings included an enlarged parotid gland replaced with extensive lipid infiltration, whereas sialography of the parotid gland revealed normal findings. Immunologic studies and analyses of the labial glands of the mouth revealed distinctive features in patients with Sjögren's syndrome. Importantly, elevated levels of plasma triglyceride correlated with parotid gland swelling, and increased cholesterol levels significantly affected salivary flow. CONCLUSION Our findings suggest a distinct entity of sicca syndrome in patients with hyperlipidemia compared with patients with Sjögren's syndrome. Characteristic MR imaging findings of salivary glands in patients with hyperlipidemia included extensive lipid infiltration and gland enlargement.
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107
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Izumi M, Nakanishi Y, Takayama K, Kimotsuki K, Inoue K, Wataya H, Minami T, Ye Q, Hara N. Comparison of D-PYD, ICTP and NTx as markers of metastatic bone disease in lung cancer. Lung Cancer 2000. [DOI: 10.1016/s0169-5002(00)80607-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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108
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Izumi M, Yokoi M, Nishikawa NS, Miyazawa H, Sugino A, Yamagishi M, Yamaguchi M, Matsukage A, Yatagai F, Hanaoka F. Transcription of the catalytic 180-kDa subunit gene of mouse DNA polymerase alpha is controlled by E2F, an Ets-related transcription factor, and Sp1. BIOCHIMICA ET BIOPHYSICA ACTA 2000; 1492:341-52. [PMID: 11004506 DOI: 10.1016/s0167-4781(00)00117-2] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We have isolated a genomic DNA fragment spanning the 5'-end of the gene encoding the catalytic subunit of mouse DNA polymerase alpha. The nucleotide sequence of the upstream region was G/C-rich and lacked a TATA box. Transient expression assays in cycling NIH 3T3 cells demonstrated that the GC box of 20 bp (at nucleotides -112/-93 with respect to the transcription initiation site) and the palindromic sequence of 14 bp (at nucleotides -71/-58) were essential for basal promoter activity. Electrophoretic mobility shift assays showed that Sp1 binds to the GC box. We also purified a protein capable of binding to the palindrome and identified it as GA-binding protein (GABP), an Ets- and Notch-related transcription factor. Transient expression assays in synchronized NIH 3T3 cells revealed that three variant E2F sites near the transcription initiation site (at nucleotides -23/-16, -1/+7 and +17/+29) had no basal promoter activity by themselves, but were essential for growth-dependent stimulation of the gene expression. These data indicate that E2F, GABP and Sp1 regulate the gene expression of this principal replication enzyme.
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Adachi K, Rhue BN, Li M, Izumi M, Osano H, Mitsuma T. Thyrotropin-releasing hormone and its receptor in the cerebellum of inferior olive destroyed rat brain. Neurol Res 2000; 22:401-3. [PMID: 10874690 DOI: 10.1080/01616412.2000.11740690] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
To study the pathophysiology of olivopontocerebellar atrophy (OPCA), we destroyed inferior olive nuclei of male Wistar rats using 3-acetyl pyridine (3-AP) + harmaline + niacinamide. These rats showed a sluggish and ataxic gait. To elucidate the relationship between thyrotropin releasing hormone (TRH) in the Purkinje cell of cerebellum and the inferior olive nucleus, we investigated the concentrations of TRH in the cerebellar cortex, nuclei, and medulla oblongata including the inferior olive nuclei using radioimmunoassay method as well as TRH receptor in the Purkinje cells of cerebellum using immunohistochemical method. All statistical comparisons were done using non-parametric tests (Mann-Whitney U-test). We found that two weeks after the treatment, TRH concentrations in the cerebellar cortex as well as nuclei were significantly lower than in the controls but no significant difference in the medulla oblongata was observed between 3-AP treated rats and controls. Moreover, four weeks after the treatment, TRH-receptor positive Purkinje cell counts were significantly fewer than in the controls. These results suggest that TRH in the Purkinje cell of cerebellum may play a role in the ataxic gait observed in the rats whose inferior olive were destroyed.
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110
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Nakanishi Y, Pei XH, Takayama K, Bai F, Izumi M, Kimotsuki K, Inoue K, Minami T, Wataya H, Hara N. Polycyclic aromatic hydrocarbon carcinogens increase ubiquitination of p21 protein after the stabilization of p53 and the expression of p21. Am J Respir Cell Mol Biol 2000; 22:747-54. [PMID: 10837373 DOI: 10.1165/ajrcmb.22.6.3877] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
Abstract
Polycyclic aromatic hydrocarbon carcinogens (PAHs) and their metabolites have been found to result in a rapid accumulation of p53 gene product in human and mouse cells. However, the induced p53 protein was reported to be transcriptionally inactive. In the present study, the induction of p53 target gene expression after the treatment with either benzo(a)pyrene (B[a]P) or 1-nitropyrene (1-NP) was investigated. A marked induction of messenger RNA (mRNA) expressions of Mdm2, Bax, and p21 was detected in wild-type p53-expressing cells after the treatment with either B[a]P or 1-NP, whereas no significant change in mRNA expression of these genes was observed in p53-negative and mutant cells. 1-NP activated the p21 promoter in a p53-dependent manner. Binding activity of p53 to a p53 consensus sequence increased after the treatment in wild-type p53-expressing cells. Nevertheless, the induced mRNA levels of the p21 did not result in a proportional p21 protein increase, indicating the possibility of post-transcriptional regulation of the protein. With the addition of MG-132, a proteasome inhibitor, to B[a]P or 1-NP treatments, both p21 and p53 protein levels were increased; however, the increase in p21 protein levels was significantly larger than the increase in p53 protein levels. PAHs treatment increased the level of ubiquitinated p21. These results suggest that the p21 product is degraded by the ubiquitin-proteasome system. We conclude that PAHs-induced p53 protein is transcriptionally active.
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MESH Headings
- Benzo(a)pyrene/pharmacology
- Blotting, Northern
- Blotting, Western
- Carcinogens/metabolism
- Carcinogens/pharmacology
- Cysteine Endopeptidases/metabolism
- Gene Expression Regulation, Neoplastic/drug effects
- Gene Expression Regulation, Neoplastic/physiology
- Genes, Reporter
- Humans
- Luciferases/genetics
- Lung Neoplasms
- Multienzyme Complexes/metabolism
- Mutagens/pharmacology
- Nuclear Proteins
- Polycyclic Aromatic Hydrocarbons/metabolism
- Polycyclic Aromatic Hydrocarbons/pharmacology
- Promoter Regions, Genetic/drug effects
- Promoter Regions, Genetic/physiology
- Proteasome Endopeptidase Complex
- Protein Binding/drug effects
- Protein Binding/physiology
- Proto-Oncogene Proteins/genetics
- Proto-Oncogene Proteins/metabolism
- Proto-Oncogene Proteins c-bcl-2
- Proto-Oncogene Proteins c-mdm2
- Proto-Oncogene Proteins p21(ras)/genetics
- Proto-Oncogene Proteins p21(ras)/metabolism
- Pyrenes/pharmacology
- RNA, Messenger/analysis
- Transcription, Genetic/drug effects
- Transcription, Genetic/physiology
- Tumor Cells, Cultured/drug effects
- Tumor Cells, Cultured/enzymology
- Tumor Suppressor Protein p53/analysis
- Tumor Suppressor Protein p53/genetics
- Tumor Suppressor Protein p53/metabolism
- Ubiquitins/metabolism
- bcl-2-Associated X Protein
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Nakae I, Matsumoto T, Horie H, Yokohama H, Omura T, Minai K, Matsui T, Nozawa M, Takahashi M, Sugimoto Y, Ito M, Izumi M, Nakamura Y, Mitsunami K, Kinoshita M. Effects of intravenous nicorandil on coronary circulation in humans: plasma concentration and action mechanism. J Cardiovasc Pharmacol 2000; 35:919-25. [PMID: 10836727 DOI: 10.1097/00005344-200006000-00014] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
We investigated the cardiovascular profile of nicorandil, an antianginal agent, in humans. Pharmacologically, nicorandil acts as both an adenosine triphosphate (ATP)-sensitive K+ (K(ATP)) channel opener and a nitrate. We examined which of these mechanistic components has a predominant vasodilatory effect at clinical doses. Fourteen patients underwent cardiac catheterization. The effects of the continuous intravenous infusion of nicorandil (12 mg/45 min) were examined in angiographically normal coronary arteries. Coronary vascular resistance was calculated from coronary artery diameter and coronary blood flow velocity measured using an intravascular Doppler catheter. We compared the hemodynamic responses to nicorandil with those to the intracoronary injection of nitroglycerin (250 microg) and papaverine (12 mg). The epicardial coronary arteries responded to nicorandil at the lowest plasma concentration examined (dilation of +14.0 +/- 3.3% at approximately 170 ng/ml), whereas dilation of the coronary resistance arteries (i.e., a decrease in coronary vascular resistance) took place only at higher concentrations (>200 ng/ml). Nitroglycerin caused no further changes in coronary artery diameter or coronary vascular resistance. Papaverine caused no further increase in coronary artery diameter, but markedly decreased coronary vascular resistance (1.6 +/- 0.3 to 0.4 +/- 0.1 mm Hg/ml/min; p < 0.05). Nicorandil significantly decreased pulmonary capillary wedge pressure (i.e., reduced cardiac preload) at a plasma level of >200 ng/ml, but did not change either systemic or pulmonary vascular resistance. Thus nicorandil preferentially dilated epicardial coronary arteries rather than coronary resistance arteries, and had a stronger effect on preload than on afterload. These changes in human coronary hemodynamics suggest that the nitrate actions of nicorandil as a coronary vasodilator predominate over those as a K(ATP) opener.
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112
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Miyamoto S, Izumi M, Hori M, Kobayashi M, Ozaki H, Karaki H. Xestospongin C, a selective and membrane-permeable inhibitor of IP(3) receptor, attenuates the positive inotropic effect of alpha-adrenergic stimulation in guinea-pig papillary muscle. Br J Pharmacol 2000; 130:650-4. [PMID: 10821794 PMCID: PMC1572115 DOI: 10.1038/sj.bjp.0703358] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022] Open
Abstract
We evaluated the role of the inositol 1,4,5-triphosphate (IP(3)) receptor-mediated Ca(2+) release on the positive inotropic effects of alpha-adrenergic stimulation using a novel, potent, selective membrane-permeable blocker of IP(3) receptor, xestospongin C. Guinea-pig papillary muscle permeabilized with saponin exhibited spontaneous oscillatory contractions in solution buffered with pCa(2+) 6.5 by a low concentration of EGTA. The oscillatory activity was increased by adding 100 microM IP(3) and abolished by 1 microM ryanodine or 30 microM cyclopiazonic acid. Xestospongin C (3 microM) inhibited the IP(3)-induced increase in the oscillatory contractions without affecting basal oscillations. In intact papillary muscle, xestospongin C (3 microM) inhibited the positive inotropic effects of phenylephrine, resulting in a rightward and downward shift of the concentration-response curve for phenylephrine. On the contrary, xestospongin C did not affect the concentration-response curve for phenylephrine obtained in the presence of ryanodine (1 microM). On the other hand, xestospongin C affected neither basal contractions nor the positive inotropic effects of a high extracellular Ca(2+) concentration (3.2 mM) or that of isoprenaline (1 and 10 nM). These results suggest that the IP(3)-mediated increase in Ca(2+) release is involved in the positive inotropic effects of alpha-adrenergic stimulation in the guinea-pig cardiac muscle.
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Izumi M, Miyamoto S, Hori M, Ozaki H, Karaki H. Negative inotropic effect of endothelin-1 in the mouse right ventricle. Eur J Pharmacol 2000; 396:109-17. [PMID: 10822063 DOI: 10.1016/s0014-2999(00)00218-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Effects of endothelin-1 on the contraction and cytosolic Ca(2+) concentrations (¿Ca(2+)(i)) of the mouse right ventricle were investigated. Endothelin-1 (1-300 nM) elicited a negative inotropic effect in a concentration-dependent manner. The endothelin-1-induced negative inotropy was antagonized by a selective endothelin ET(A) receptor antagonist, BQ-123 (cyclo ¿Asp-Pro-Val-Leu-Trp-; 3, 10 microM). Endothelin-1 reduced the peak amplitudes of both the ¿Ca(2+)(i) transient and contraction without changing inward Ca(2+) current. The relationship between peak amplitude of ¿Ca(2+)(i) and peak force generated by changing the extracellular Ca(2+) concentration (¿Ca(2+)(o)) was not affected by endothelin-1. In addition, the trajectory of the ¿Ca(2+)(i)-contraction phase plane diagram obtained at 2 mM ¿Ca(2+)(o) in the absence of endothelin-1 was superimposable on that obtained at 4 mM ¿Ca(2+)(o) in the presence of endothelin-1 (300 nM). Endothelin-1 (300 nM) translocated protein kinase C from cytosol to membrane, suggesting activation of protein kinase C. Further, a selective protein kinase C inhibitor, bisindolylmaleimide I (10 microM), inhibited the endothelin-1-induced negative inotropy. These results suggest that endothelin-1 elicits negative inotropy by reducing the amplitude of the ¿Ca(2+)(i) transient without changing inward Ca(2+) current through the activation of the endothelin ET(A) receptor followed by protein kinase C activation in the mouse right ventricle.
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114
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Hara N, Nakanishi Y, Izumi M. [Epidemiology of lung cancer in Japan]. NIHON RINSHO. JAPANESE JOURNAL OF CLINICAL MEDICINE 2000; 58:1005-11. [PMID: 10824540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
Lung cancer is the most common cause of cancer-related death in both men and women. There are over 51,000 deaths annually from this disease in Japan. The characteristics of lung cancer have changed for several decades. The incidence of the elderly, adenocarcinoma in histology, and stage I disease continues to increase from year to year. In the 1970s, six randomized trials were carried out to evaluate lung cancer screening in the U.S. and Europe. These studies did not contribute to decrease death rate. They concluded there is no evidence to recommend against lung cancer screening. On the other hand, in Japan, several trials by case-control study demonstrated that chest x-ray screening is associated with earlier detection and improved survival. The conclusions are controversial in two studies. Further investigation will be needed to define the benefit of cancer screening.
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115
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Chikui T, Yonetsu K, Izumi M, Eguchi K, Nakamura T. Abnormal blood flow to the submandibular glands of patients with Sjögren's syndrome: Doppler waveform analysis. J Rheumatol 2000; 27:1222-8. [PMID: 10813291] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/16/2023]
Abstract
OBJECTIVE To assess abnormalities in blood flow to the submandibular glands of patients with Sjögren's syndrome (SS). METHODS Doppler waveform analysis was performed on the facial artery to assess blood inflow to the submandibular gland of 21 patients with primary SS and 69 healthy subjects. Blood flows were compared before and after secretory stimulation with lemon extracts. RESULTS The facial artery of healthy subjects in the resting state exhibited a biphasic waveform with a high systolic peak and a prominent second peak of compliance followed by a low diastolic flow. In contrast, the waveform of patients with SS was more uniform compared with the healthy subjects, substantiated by decreased resistive and pulsatility indices, suggesting a hyperemic state of the downstream vascular bed. After stimulation of salivary secretion, the facial artery of healthy subjects responded by decreasing resistive and pulsatility indices, waveform changes indicative of increased blood inflow to the submandibular gland. In contrast, the facial artery of patients with SS responded insufficiently to the stimulation, with the magnitude of changes in the resistive and pulsatility indices being significantly lower than those of the controls. Doppler waveform abnormalities were correlated with the severity of gland damage, supporting a close connection between abnormal blood inflow to the salivary gland and impaired secretory function in SS. CONCLUSION Our findings suggest that blood inflow responses to secretory stimulation may be defective in the salivary glands of patients with SS.
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116
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Funamoto M, Fujio Y, Kunisada K, Negoro S, Tone E, Osugi T, Hirota H, Izumi M, Yoshizaki K, Walsh K, Kishimoto T, Yamauchi-Takihara K. Signal transducer and activator of transcription 3 is required for glycoprotein 130-mediated induction of vascular endothelial growth factor in cardiac myocytes. J Biol Chem 2000; 275:10561-6. [PMID: 10744750 DOI: 10.1074/jbc.275.14.10561] [Citation(s) in RCA: 119] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
Activation of glycoprotein (gp) 130 transduces hypertrophic and cytoprotective signals in cardiac myocytes. In the present study, we have demonstrated that signals through gp130 increase the expression of vascular endothelial growth factor (VEGF) in cardiac myocytes via the signal transducer and activator of transcription (STAT) 3 pathway. After activation of gp130 with leukemia inhibitory factor (LIF), expression of VEGF mRNA rapidly increased with a peak at 3 h in cultured cardiac myocytes. Cardiotrophin-1 also enhanced VEGF mRNA expression in a dose-dependent manner. VEGF protein production and secretion to the medium were also enhanced by LIF and cardiotrophin-1 but not by interleukin-6. Adenovirus transfer of the dominant-negative form of STAT3 to cultured cardiac myocytes inhibited induction of VEGF expression induced by LIF, but neither PD98059 nor wortmannin was affected. In murine hearts, intravenous administration of LIF augmented expression of VEGF mRNA; however, the hearts of transgenic mice overexpressing dominant-negative STAT3 showed reduced expression of VEGF mRNA that was not induced after LIF stimulation. These data provide the first evidence that a STAT family protein functions as a regulator of angiogenic growth factors and suggest that gp130/STAT signaling in cardiac myocytes can control vessel growth during cardiac remodeling.
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117
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Maeda H, Fujita MQ, Zhu BL, Ishidam K, Oritani S, Tsuchihashi H, Nishikawa M, Izumi M, Matsumoto F. A case of serial homicide by injection of succinylcholine. MEDICINE, SCIENCE, AND THE LAW 2000; 40:169-174. [PMID: 10821030 DOI: 10.1177/002580240004000215] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The abstract of this paper was presented at the 14th Meeting of the International Association of Forensic Sciences, Tokyo in 1996. We report a bizarre criminal case of suspected serial homicide by injection of a muscle relaxant (succinylcholine). Five victims were found buried in a rural area. In two victims showing moderate decomposition (about three months after death), intense pulmonary oedema with pleural effusion was observed. Evidence of a puncture site was found in one of the victims. Succinylcholine could not be detected in the victims, but was identified in a syringe found near the corpses. The 40-mg ampule dose of succinylcholine administered intramuscularly to the victims, possibly causing prolonged apnea, was considered to be at least around the minimum lethal dose, although the combined effect of the sedation with hypnotics also used was not negligible.
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Mitsuma T, Hirooka Y, Kayama M, Mori Y, Yokoi Y, Rhue N, Ping J, Izumi M, Ikai R, Adachi K, Nogimori T. Radioimmunoassay for orexin A. Life Sci 2000; 66:897-904. [PMID: 10714890 DOI: 10.1016/s0024-3205(99)00673-6] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A radioimmunoassay for orexin A has been developed. Anti-orexin A antiserum was raised in New Zealand white rabbits immunized with a conjugate of synthetic orexin A with bovine serum albumin. This antibody did not crossreact with orexin B, hypothalamic hormones, pituitary hormones, neuropeptides or gut hormones. Radioiodination of orexin A was performed with the chloramin T method, followed by purification of radioiodinated material on Sephadex G-25 column. Orexin A was extracted from tissues using acid-acetone. The assay was performed with a double antibody system. The dilution curve of acid-acetone-extracts of rat hypothalamus in the radioimmunoassay system was parallel to the standard curve. The recovery of tissue orexin A was about 80%,and the intra-assay and inter-assay variations were 5.2% and 7.8%, respectively. Orexin A was found in the hypothalamus, cerebrum and testis. These data suggest that this assay system is suitable for the measurement of tissue orexin A and that orexin A is found in the central nervous system and testis.
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119
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Nishikawa NS, Izumi M, Uchida H, Yokoi M, Miyazawa H, Hanaoka F. Cloning and characterization of the 5'-upstream sequence governing the cell cycle-dependent transcription of mouse DNA polymerase alpha 68 kDa subunit gene. Nucleic Acids Res 2000; 28:1525-34. [PMID: 10710418 PMCID: PMC102782 DOI: 10.1093/nar/28.7.1525] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023] Open
Abstract
We have isolated the genomic DNA fragment spanning the 5-end and the first four exons encoding the 68 kDa subunit (p68) of the mouse DNA polymerase alpha-primase complex [corrected]. The p68 promoter region lacks TATA and CAAT boxes, but contains a GC-rich sequence, two palindrome sequences and two putative E2F-binding sites [corrected]. A series of transient expression assays using a luciferase reporter gene indicated that a region from nucleotide position -89 to -30 (-89/-30) with respect to the transcription initiation site is crucial for basal transcription of the p68 gene in proliferating NIH 3T3 cells. In particular, part of the GC-rich sequence (-57/-46) and the palindrome (-81/-62) elements were necessary for promoter activity, both of which share homology with the E-box sequence. Gel mobility shift assays using NIH 3T3 nuclear extracts revealed that the upstream stimulatory factor, known as an E-box-binding protein, binds to these sites. Moreover, we observed binding of E2F to two sites near the transcription initiation site (-11/-3 and +9/+16). A transient luciferase expression assay using synchronized NIH 3T3 cells in G(0)phase revealed that these E2F sites are essential for transcription induction of the p68 gene after serum stimulation, but are dispensable for basal transcription. These results indicate that growth-dependent regulation of transcription of the mouse p68 and p180 genes is mediated by a common factor, E2F; however, basal transcription of the genes, interestingly, is regulated by different transcription factors.
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Izumi M, Sugiura T, Nakamura H, Nagatoya K, Imai E, Hori M. Differential diagnosis of prerenal azotemia from acute tubular necrosis and prediction of recovery by Doppler ultrasound. Am J Kidney Dis 2000; 35:713-9. [PMID: 10739794 DOI: 10.1016/s0272-6386(00)70020-5] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Acute renal failure (ARF) is a life-threatening disease that often causes multiple organ dysfunction. The accurate and rapid diagnosis of the cause of ARF is particularly important for selecting the appropriate therapy. Ultrasound Doppler is a noninvasive diagnostic method that has recently been introduced to clinical nephrology. We report the diagnostic value of Doppler ultrasound in differentiating acute tubular necrosis (ATN) from prerenal azotemia by comparing this study with the fractional excretion of sodium (FENa), renal failure index (RFI), and urinary/serum creatinine (Cr) ratio. Doppler ultrasound was able to differentiate prerenal azotemia from ATN, equivalent to FENa, RFI, and the urinary/serum Cr ratio. Doppler ultrasound does not require blood or urine samples and can be performed at the bedside. Of note, Doppler is unaffected by changes in Na or Cr in urine or serum after diuretics or hemodialysis. Furthermore, one can predict recovery from ATN by Doppler findings. Thus, we consider Doppler ultrasound an effective diagnostic tool in ARF.
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Shiomi H, Hase T, Matsuno S, Izumi M, Tatsuta T, Ito F, Kishida A, Tani T, Kodama M. Handlebar hernia with intra-abdominal extraluminal air presenting as a novel form of traumatic abdominal wall hernia: report of a case. Surg Today 2000; 29:1280-4. [PMID: 10639713 DOI: 10.1007/bf02482224] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
An 18-year-old male was admitted to our Emergency Department with a traumatic abdominal wall hernia (TAWH) of the left lower quadrant (LLQ) after suffering hypogastric blunt injury and urogenital lacerations in a motorcycle accident. Upright chest X-ray showed a small amount of right infradiaphragmatic free air, and a computed tomographic (CT) scan demonstrated an abdominal wall hernia. At surgery, no impairment was found in the digestive tract, and an abdominal herniorrhaphy was performed. It is suggested that the free air had passed through a connection between the scrotal laceration and the contralateral abdominal defect via the subcutaneous space and was palpated as emphysema. This is a new type of TAWH, which suggests that blunt abdominal trauma may result in negative pressure in the subcutaneous and peritoneal cavity, and this could reflect the pathophysiology of TAWH.
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Mitsuma T, Hirooka Y, Kayma M, Mori Y, Yokoi Y, Izumi M, Rhue N, Ping J, Adachi K, Ikai R, Kawai N, Nakayashiki A, Nogimori T. Radioimmunoassay for hypocretin-2. Endocr Regul 2000; 34:23-7. [PMID: 10808249] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/16/2023] Open
Abstract
OBJECTIVE To develop radioimmunoassay for hypocretin-2 (Hcrt-2). And search for its presence in certain rat tissues. METHODS Anti-Hcrt-2 serum has been raised in New Zealand white rabbits immunized with a conjugate of synthetic Hcrt-2 with bovine serum albumin. Radioiodination of Hcrt-2 was performed by chloramine T method, followed by purification of radoiodinated material on Sephadex G-25 column. RESULTS The obtained antibody did not cross react with hypocretin-2, hypothalamic hormones, pituitary hormones, neuropeptides or gut hormones. The assay was performed with a double antibody system. Hcrt-2 was extracted from the tissues with acid acetone. The dilution curve of acid acetone extracts of rat hypothalamus in the radioimmunoassay system was parallel to the standard curve. The recovery of tissue Hcrt-2 was about 85 % and the intra-assay and inter-assay variation were 5.6 % and 8.0 %, respectively. Hcrt-2 was found in the hypothalamus, cerebrum, brain stem and testes. CONCLUSIONS The obtained data suggest that the assay system developed is suitable to measure Hcrt-2 in tissues and that Hcrt-2 is mainly found in the hypothalamus.
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Terao S, Takeda A, Miura N, Izumi M, Ito E, Mitsuma T, Sobue G. Clinical and pathophysiological features of amaurosis fugax in Japanese stroke patients. Intern Med 2000; 39:118-22. [PMID: 10732827 DOI: 10.2169/internalmedicine.39.118] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
OBJECTIVE It has been emphasized that amaurosis fugax (AmF) is caused by thromboembolism due to atheromatous lesions of the extracranial carotid artery (EC-CA) in Caucasian populations. However, there have been few studies of AmF in Japan. We analyzed the clinical and pathophysiologic features of AmF in 43 Japanese AmF patients. SUBJECTS AND METHODS Forty-three patients presented with AmF from a group of 2,056 Japanese patients with acute ischemic stroke. We investigated angiographic and transcranial Doppler findings, precipitating factors, medical treatment and prognosis, to elucidate the pathogenetic mechanism of AmF. RESULTS Angiographic findings revealed an intracranial lesion in 22 patients (51%), extracranial lesion in 16 (37%), and no abnormality in 5 (12%). Blood flow in the ophthalmic artery (OA) examined by the transcranial Doppler ultrasonography (TCD) showed normal antegrade flow in 24 patients and reversed flow in 7. Precipitating factors for AmF were seen in 7 out of 43 patients. Regarding the pathogenesis of AmF, the micro-thromboembolism originated from the internal carotid artery (ICA) in 25 patients, the thromboembolism was via the external carotid artery (ECA) in 7, the hemodynamic retinal vascular insufficiency in 6 patients showed various atheromatous changes in the intracranial carotid artery (IC-CA) or EC-CA, and the cause was unknown in 5. CONCLUSION In this series of patients, AmF was mainly caused by thromboembolism from IC-CA atheromatous lesions. Micro-thromboemboli from the ECA or hemodynamic retinal vascular insufficiency, although less frequent, should also be considered as possible etiologies for AmF.
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Oka K, Izumi M, Sugiura T, Isaka Y, Takenaka M, Moriyama T, Imai E, Hori M, Kyo M, Kokado Y, Takahara S, Takama T. Posttransplant IgA nephropathy: A clinicopathological study in comparison with IgA nephropathy in native kidney. Nephrology (Carlton) 2000. [DOI: 10.1046/j.1440-1797.1999.00093.x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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Iwamoto K, Kuramoto T, Izumi M, Kirihata M, Dohmaru T, Yoshizako F. Asymmetric reduction of ethyl 2-methyl e-oxobutanoate by fungi. Biosci Biotechnol Biochem 2000; 64:194-7. [PMID: 10766507 DOI: 10.1271/bbb.64.194] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Seven fungi, which are found to reduce ethyl 3-oxobutanoate in high yields, were tested for their reducing ability for ethyl 2-methyl 3-oxobutanoate. We obtained some interesting findings. In particular, Penicillium purpurogenum reduced ethyl 2-methyl 3-oxobutanoate to the corresponding alcohols with the diastereomer (anti/syn) ratio of 93/7 with the enantiomeric excess of anti-(2S,3S)- and syn-(2S,3R)- hydroxy esters of 90 and >99 ee%, respectively.
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Izumi M. Corticocortical projection from field AES in the cat. Neurosci Res 2000. [DOI: 10.1016/s0168-0102(00)81785-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Shen GJ, Datta AK, Izumi M, Koeller KM, Wong CH. Expression of alpha2,8/2,9-polysialyltransferase from Escherichia coli K92. Characterization of the enzyme and its reaction products. J Biol Chem 1999; 274:35139-46. [PMID: 10574996 DOI: 10.1074/jbc.274.49.35139] [Citation(s) in RCA: 46] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022] Open
Abstract
The capsular polysaccharide of Escherichia coli K92 contains alternating -8-NeuAcalpha2- and -9-NeuAcalpha2- linkages. The enzyme catalyzing this polymerizing reaction has been cloned from the genomic DNA of E. coli K92. The 1.2-kilobase polymerase chain reaction fragment was subcloned in pRSET vector and the protein was expressed in the BL21(DE3) strain of E. coli with a hexameric histidine at its N-terminal end. The enzyme was isolated in the supernatant after lysis of the cells and fractionated by ultracentrifugation. Western blotting using anti-histidine antibody showed the presence of a band that migrated at about 47.5 kDa on both reducing and nonreducing SDS-polyacrylamide gel electrophoresis, indicating a monomeric enzyme. Among the carbohydrate acceptors tested, N-acetylneuraminic acid and the gangliosides G(D3) and G(Q1b) were preferred substrates. The cell-free enzyme reaction products obtained were characterized by NMR and mass spectrometry, which indicated the presence of both alpha2,9- and alpha2,8-linked polysialyl structure. The K92 neuS gene was used to transform the K1 strain of E. coli, the capsule of which contains only -8-NeuAcalpha2- linkages. Analysis of the polysaccharides isolated from these transformed cells is consistent with the presence of both -8-NeuAcalpha2- and -9-NeuAcalpha2- linkages. Our results suggest that the neuS gene product of E. coli K92 catalyzes the synthesis of polysialic acid with alpha2,9- and alpha2,8-linkages in vitro and in vivo.
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Abstract
The expression of transfected genes in mammalian cells is rapidly repressed by epigenetic mechanisms such that, within a matter of weeks, only a fraction of the cells in most clonal populations still exhibit detectable expression. This problem can become prohibitive when one wants to express two ectopically introduced genes, as is necessary to establish cell lines that harbor genes regulated by the tetracycline-controlled transactivators. We describe an approach to establish Chinese hamster ovary (CHO) cell lines that stably induce a tet-responsive reporter gene in all cells of a transfected clonal population. Screening of more than 100 colonies resulting from a standard co-transfection of the tetracycline transactivator (tTA) with a green fluorescent protein (GFP) reporter plasmid failed to identify a single colony that could induce GFP in more than 20% of cells. The presence of chromatin insulator sequences, previously shown to protect some transfected genes from epigenetic silencing, moderately improved stability but was not sufficient to produce homogeneous transformants. However, when cell lines were first established in which selection could be maintained either for the expression of tTA activity (co-transfection with a tTA-responsive selectable marker) or the presence of tTA mRNA (bicistronic message encoding a selectable marker), these cell lines could be subsequently transfected with the GFP reporter construct, and nearly 10% of the resulting colonies exhibited stable homogeneous tet-responsive GFP expression in 100% of the expanded clonal cell population.
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Izumi M, Nakamura H, Nakamura T, Eguchi K, Nakamura T. Sjögren's syndrome (SS) in patients with human T cell leukemia virus I associated myelopathy: paradoxical features of the major salivary glands compared to classical SS. J Rheumatol 1999; 26:2609-14. [PMID: 10606370] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
OBJECTIVE To characterize imaging features of the major salivary glands in patients with human T cell leukemia virus I (HTLV-I) associated myelopathy (HAM) associated with Sjögren's syndrome (SS), and to compare these features with those in HAM negative patients with SS. METHODS The study population included 31 HAM patients (12 had associated SS), 15 HTLV-I seropositive/HAM negative patients with SS, and 41 HTLV-I seronegative patients with SS. Twenty HAM negative patients with sicca syndrome only were also studied. Diagnostic imaging (sialography, magnetic resonance imaging, and sonography) of the salivary glands, labial gland biopsy, Schirmer test, Saxon test, and serological tests were performed on these patients. RESULTS The parotid and submandibular glands in 11 (92%) of the 12 HAM patients with SS completely lacked the abnormal imaging features characteristic of the disease, while they displayed decreased salivary flow rates at levels similar to those in the HAM negative patients with SS. The labial glands from the HAM patients with SS exhibited significantly lower magnitudes of mononuclear cell aggregation compared with those in the HAM negative patients with SS. In contrast, all HAM negative patients with SS showed abnormal imaging features characteristic of the disease, and the severity in salivary dysfunction correlated well with the imaging findings. CONCLUSION These results suggest that SS in patients with HAM may occur in part via a mechanism distinctive from classical SS in HAM negative patients.
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Tsuboi K, Kamikonya N, Izumi M, Irie M, Takemoto Y, Kakishita E, Kai S, Hara H, Yamamoto M, Tanizawa T, Nakao N. [Fundamental and clinical study of three-dimensional compensating filters and direct dose monitoring system for total body irradiation]. NIHON IGAKU HOSHASEN GAKKAI ZASSHI. NIPPON ACTA RADIOLOGICA 1999; 59:782-7. [PMID: 10614110] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/15/2023]
Abstract
We devised 3D-compensating filters to improve dose distribution during total body irradiation (TBI). This study investigated the effect of these 3D-compensating filters and related complications in patients who had undergone bone marrow transplantation (BMT) followed by TBI. The 3D-compensating filters were fabricated by CT measurement of body thickness. The effectiveness of the 3D-compensating filters in producing a homogeneous dose distribution was checked by a thermoluminescent dosimeter (TLD) and semiconductor detectors in all patients. At the pelvis, the dose was measured simultaneously with an ionization chamber. The average dose distribution to each site when the 3D-compensating filter was used was 93% to the head, 97% to the neck, 99% to the thorax, and 98% to the pelvis in TLD when the scheduled dose was taken as 100%. There was no significant difference between the TBI and non-TBI groups with regard to the frequency of lung toxicity. Clinical interstitial pneumonitis occurred in 22.7% of the patients, interstitial pneumonitis with CMV in 13.6%, and idiopathic pneumonitis in 6.1% without any virus infection. Only one patient was regarded as having radiation-induced pneumonitis. 3D-compensating filters can be conveniently produced within a short time following CT measurement, and they seem to be safe and useful for dose flattening during TBI.
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Tsuchikane E, Sumitsuji S, Awata N, Nakamura T, Kobayashi T, Izumi M, Otsuji S, Tateyama H, Sakurai M, Kobayashi T. Final results of the STent versus directional coronary Atherectomy Randomized Trial (START). J Am Coll Cardiol 1999; 34:1050-7. [PMID: 10520789 DOI: 10.1016/s0735-1097(99)00324-1] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
OBJECTIVES This study was designed to compare primary stenting with optimal directional coronary atherectomy (DCA). BACKGROUND No previous prospective randomized trial comparing stenting and DCA has been performed. METHODS One hundred and twenty-two lesions suitable for both Palmaz-Schatz stenting and DCA were randomly assigned to stent (62 lesions) or DCA (60 lesions) arm. Single or multiple stents were implanted with high-pressure dilation in the stent arm. Aggressive debulking using intravascular ultrasound (IVUS) was performed in the DCA arm. Serial quantitative angiography and IVUS were performed preprocedure, postprocedure and at six months. The primary end point was restenosis, defined as > or =50% diameter stenosis at six months. Clinical event rates at one year were also assessed. RESULTS Baseline characteristics were similar. Procedural success was achieved in all lesions. Although the postprocedural lumen diameter was similar (2.79 vs. 2.90 mm, stent vs. DCA), the follow-up lumen diameter was significantly smaller (1.89 vs. 2.18 mm; p = 0.023) in the stent arm. The IVUS revealed that intimal proliferation was significantly larger in the stent arm than in the DCA arm (3.1 vs. 1.1 mm ; p < 0.0001), which accounted for the significantly smaller follow-up lumen area of the stent arm (5.3 vs. 7.0 mm2; p = 0.030). Restenosis was significantly lower (32.8% vs. 15.8%; p = 0.032), and target vessel failure at one year tended to be lower in the DCA arm (33.9% vs. 18.3%; p = 0.056). CONCLUSIONS These results suggest that aggressive DCA may provide superior angiographic and clinical outcomes to primary stenting.
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Sumi M, Izumi M, Yonetsu K, Nakamura T. The MR imaging assessment of submandibular gland sialoadenitis secondary to sialolithiasis: correlation with CT and histopathologic findings. AJNR Am J Neuroradiol 1999; 20:1737-43. [PMID: 10543651 PMCID: PMC7056172] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
BACKGROUND AND PURPOSE MR imaging has been proved to be effective in depicting wide variety of pathologic changes of the salivary gland. Therefore, we evaluated clinical usefulness of MR imaging for sialolithiasis. METHODS Sixteen patients with sialolithiasis of the submandibular gland underwent MR imaging. MR images of the glands were obtained with a conventional (T1-weighted), fast spin-echo (fat-suppressed T2-weighted) and short inversion time-inversion recovery sequences. Contrast enhancement was not used. MR imaging features then were compared with clinical symptoms, histopathologic features of excised glands, and CT imaging features. RESULTS Submandibular glands with sialolithiasis could be classified into three types on the basis of clinical symptoms and MR imaging features of the glands. Type I glands were positive for clinical symptoms and MR imaging abnormalities, and were characterised histopathologically by active inflammation (9 [56%] of 16). Type II glands were negative for clinical symptoms and positive for MR imaging abnormalities (4 [25%] of 16), and the glands were replaced by fat. Type III glands were negative for clinical symptoms and MR imaging abnormalities (3 [19%] of 16). CT features of these glands correlated well with those of MR imaging. CONCLUSION These results suggest that MR imaging features may reflect chronic and acute obstruction, and a combination of CT and MR imaging may complement each other in examining glands with sialolithiasis.
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Adachi K, Izumi M, Mitsuma T. Effect of vitamin E deficiency on rat brain monoamine metabolism. Neurochem Res 1999; 24:1307-11. [PMID: 10492527 DOI: 10.1023/a:1020937409855] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
We investigated the effects of vitamin E deficiency on the monoamine metabolism in the rat brain. Male Wistar rats fed on the vitamin E deficient diet for 24 weeks were analyzed. At 28 weeks, they showed a reduced growth rate (52% of reduction), muscle atrophy, a motor weakness of hind limbs and disturbance of gait. The concentrations of monoamines, their precursors and metabolites in the brain were simultaneously determined using high performance liquid chromatography (HPLC) coupled with a coulometric detection with electrode array system. In addition, tryptophan hydroxylase activity was measured. The dopamine (p = 0.009) and serotonin (p = 0.04) levels in the brain stem of vitamin E deficient rats were significantly lower than in the controls, whereas their precursors tyrosine (p = 0.0009) and tryptophan (p = 0.0065) levels in the brain stem were significantly higher than in the controls. Moreover, tryptophan hydroxylase activity (p = 0.0005) in the brain stem of vitamin E deficient brains was significantly lower than in the controls. All statistical comparisons were done using non-parametric tests (Mann-Whitney U test). These results suggest that vitamin E deficiency may play a role in the disturbance of monoamine metabolism in rat brain.
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Burkart MD, Izumi M, Wong CH. Enzymatic Regeneration of 3'-Phosphoadenosine-5'-Phosphosulfate Using Aryl Sulfotransferase for the Preparative Enzymatic Synthesis of Sulfated Carbohydrates. Angew Chem Int Ed Engl 1999; 38:2747-2750. [PMID: 10508369 DOI: 10.1002/(sici)1521-3773(19990917)38:18<2747::aid-anie2747>3.0.co;2-2] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
A cost-efficient preparative enzymatic sulfation of oligosaccharides has been developed. Starting from adenosine 3'5'-diphosphate (PAP), the sulfate donating and highly expensive cofactor 3'-phosphoadenosine-5'-phosphosulfate (PAPS, 1) can be regenerated by using a recombinant aryl sulfotransferase and p-nitrophenyl sulfate. This system averts product inhibition by PAP and can serve as a continuous spectrophotometric assay for the activity of any sulfotransferase enzyme.
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Yoshida M, Iwai N, Ohmichi N, Izumi M, Nakamura Y, Kinoshita M. D allele of the angiotensin-converting enzyme gene is a risk factor for secondary cardiac events after myocardial infarction. Int J Cardiol 1999; 70:119-25. [PMID: 10454299 DOI: 10.1016/s0167-5273(99)00064-9] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
We retrospectively examined the relationship between the genotype of the angiotensin-converting enzyme (ACE) gene or the 5,10-methylenetetrahydrofolate reductase (MTHFR) gene, and the secondary cardiac events after myocardial infarction. The study population consisted of 176 patients (ACE genotype: deletion homozygote (DD)=20, insertion/deletion heterozygote (ID)=91, insertion homozygote (II)=65; MTHFR genotype: valine homozygote (VV)=37, valine/alanine heterozygote (VA)=71, alanine homozygote (AA)=68) with acute or recent myocardial infarction at the start of the follow-up. We defined the occurrence of cardiac death, recurrent myocardial infarction, or admission due to unstable angina as the endpoint. Cardiac events related coronary intervention were excluded from the endpoints. During the follow-up (1903+/-1414 days), four patients had cardiac death, 12 patients had recurrent myocardial infarction and 13 patients had admission due to unstable angina. A Cox analysis revealed that the endpoints were significantly associated with diabetes mellitus (RR=4.423), total cholesterol level (RR=1.025) and the genotype of the ACE gene (RR=4.490). The ID or DD genotype of the ACE gene was associated with higher occurrence of the endopoints. The MTFHR gene was not associated with the endopoint. The present results suggest that the presence of the deletion allele of the ACE gene may be a risk factor for secondary cardiac events after myocardial infarction.
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Tsuchikane E, Fukuhara A, Kobayashi T, Kirino M, Yamasaki K, Kobayashi T, Izumi M, Otsuji S, Tateyama H, Sakurai M, Awata N. Impact of cilostazol on restenosis after percutaneous coronary balloon angioplasty. Circulation 1999; 100:21-6. [PMID: 10393676 DOI: 10.1161/01.cir.100.1.21] [Citation(s) in RCA: 142] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Restenosis after percutaneous transluminal coronary (balloon) angioplasty (PTCA) remains a major drawback of the procedure. We previously reported that cilostazol, a platelet aggregation inhibitor, inhibited intimal proliferation after directional coronary atherectomy and reduced the restenosis rate in humans. The present study aimed to determine the effect of cilostazol on restenosis after PTCA. METHODS AND RESULTS Two hundred eleven patients with 273 lesions who underwent successful PTCA were randomly assigned to the cilostazol (200 mg/d) group or the aspirin (250 mg/d) control group. Administration of cilostazol was initiated immediately after PTCA and continued for 3 months of follow-up. Quantitative coronary angiography was performed before PTCA and after PTCA and at follow-up. Reference diameter, minimal lumen diameter, and percent diameter stenosis (DS) were measured by quantitative coronary angiography. Angiographic restenosis was defined as DS at follow-up >50%. Eligible follow-up angiography was performed in 94 patients with 123 lesions in the cilostazol group and in 99 patients with 129 lesions in the control group. The baseline characteristics and results of PTCA showed no significant difference between the 2 groups. However, minimal lumen diameter at follow-up was significantly larger (1.65+/-0.55 vs 1.37+/-0.58 mm; P<0.0001) and DS was significantly lower (34.1+/-17.8% vs 45.6+/-19. 3%; P<0.0001) in the cilostazol group. Restenosis and target lesion revascularization rates were also significantly lower in the cilostazol group (17.9% vs 39.5%; P<0.001 and 11.4% vs 28.7%; P<0. 001). CONCLUSIONS Cilostazol significantly reduces restenosis and target lesion revascularization rates after successful PTCA.
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Chikui T, Izumi M, Eguchi K, Kawabe Y, Nakamura T. Doppler spectral waveform analysis of arteries of the hand in patients with Raynaud's phenomenon as compared with healthy subjects. AJR Am J Roentgenol 1999; 172:1605-9. [PMID: 10350298 DOI: 10.2214/ajr.172.6.10350298] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
OBJECTIVE We sought to characterize and compare the blood flow patterns of peripheral arteries of the hand in patients with Raynaud's phenomenon and in healthy subjects. SUBJECTS AND METHODS We used Doppler sonography to assess the blood flow pattern of the proper palmar digital artery and the deep radial arch in the hands of 79 healthy subjects and 24 patients with primary and secondary Raynaud's phenomenon. We determined the resistive index, pulsatility index, peak systolic velocity, and end-diastolic velocity of these peripheral arteries at rest and after cold immersion. RESULTS The proper palmar digital artery of healthy subjects showed higher end-diastolic velocities and lower resistive indexes than did the deep radial arch. Compared with healthy subjects, patients with Raynaud's phenomenon had higher resistive and pulsatility indexes but lower peak systolic and end-diastolic velocities in these arteries. Accordingly, the differences in end-diastolic velocity and resistive index seen in the two peripheral arteries of healthy subjects were not seen in patients with Raynaud's phenomenon. Analysis of receiver operating characteristic curves showed high diagnostic accuracy in detecting the disease. Cold-immersion studies revealed that for the proper palmar digital arteries throughout the time after immersion, all these Doppler parameters were significantly lower for the velocities and higher for the indexes in patients with Raynaud's phenomenon than in healthy subjects. CONCLUSION Taken together, these results suggest a legitimate role for Doppler sonography in the assessment of Raynaud's phenomenon.
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Ando Y, Moriyama T, Oka K, Takatsuji K, Miyazaki M, Akagi Y, Kawada N, Isaka Y, Izumi M, Yokoyama K, Yamauchi A, Horio M, Ando A, Ueda N, Sobue K, Imai E, Hori M. Enhanced interstitial expression of caldesmon in IgA nephropathy and its suppression by glucocorticoid-heparin therapy. Nephrol Dial Transplant 1999; 14:1408-17. [PMID: 10383000 DOI: 10.1093/ndt/14.6.1408] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND With progressive renal disease, structural derangement increasingly encompasses the tubulointerstitial compartment. Tubulointerstitial injury is a critical determinant of renal functional reserve and prognosis in renal disease. Interstitial cells acquiring characteristic of myofibroblasts are an important contributor to interstitial fibrosis. Caldesmon, a calmodulin or actin binding protein, is a molecular marker of differentiation in smooth muscle cells and has recently been shown by us to be a good marker of mesangial cell activation in IgA nephropathy patients. METHODS. We studied whether the expression of caldesmon in interstitium of the kidney was enhanced in the process of glomerular disease and whether it would be a marker of interstitial activation in specific disease states. We performed immunohistochemical staining with anti-caldesmon antibodies in 38 biopsy specimens from IgA nephropathy patients and analysed them quantitatively with a computer-aided manipulator. Interstitial caldesmon expression were compared with histological changes and clinical parameters. RESULTS Caldesmon expression was enhanced where interstitial cell infiltration and fibrosis were found. Immunoelectron microscopy revealed that caldesmon staining in the renal interstitium was cytoplasmic, and in the processes of myofibroblast-like cells. Caldesmon expression was more prominent in the intense CD68 infiltrated group than in the low positive cells infiltrated group. Patients showing high intensity of interstitial caldesmon expression had significantly higher urinary protein excretion than those showing low intensity of caldesmon expression. Next, 15 patients were treated with glucocorticoid and heparin for 4-8 weeks and re-biopsies were performed. Caldesmon expression was reduced in concomitant with decreased interstitial cell infiltration. Follow-up of these patients (average 24 months) revealed a significant suppression of urinary protein excretion and significant improvement of creatinine clearance. CONCLUSION These results suggest that the interstitial caldesmon expression is associated with the progression of IgA nephropathy, and glucocorticoid--heparin therapy may reverse the phenotypic change of interstitial cells during the disease process of glomerulonephritis.
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Tsutsumi H, Ohwada S, Takeyoshi I, Izumi M, Ogawa T, Fukusato T, Morishita Y. Primary omental liposarcoma presenting with torsion: a case report. HEPATO-GASTROENTEROLOGY 1999; 46:2110-2. [PMID: 10430407] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Abstract
An 83 year-old man was admitted because of abdominal pain and distention. A mass measuring 20x10 cm and associated with tenderness and guarding was palpable in the right lower abdomen. Ultrasonography and computed tomography showed a tumor with solid and multiple cystic areas. Celiac angiography showed slight tumor vascularity fed by the right gastroepiploic artery. A malignant tumor of the omentum was suspected. At laparotomy, torsion of the omental pedicle of the tumor was found. Histological examination of the resected tumor revealed characteristics of round-cell liposarcoma, which usually has a poor prognosis. The patient has been alive and well for 2 years. Primary liposarcoma of the omentum has been reported in only seven previous cases. None of these patients presented with torsion, and no report has thus far included a documented survival.
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Ohwada S, Sato Y, Oriuchi N, Nakamura S, Tanahashi Y, Izumi M, Ogawa T, Takeyoshi I, Ikeya T, Iino Y, Morishita Y. Gastric emptying after segmental gastrectomy for early cancer in the middle part of the stomach. HEPATO-GASTROENTEROLOGY 1999; 46:2081-5. [PMID: 10430401] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
BACKGROUND/AIMS We evaluated the quality of life and gastric emptying in patients who had undergone a segmental gastrectomy to treat early gastric cancer in the middle part of the stomach. METHODOLOGY Thirty patients were considered in this study. Their mean age was 65.5 years (range: 44-83). All of the patients were free from recurrence of their cancer in the follow-up period. This ranged from 5 to 50 months (mean 30). Patients were interviewed at regular intervals to assess their quality of life and to note particular complaints. The upper gastrointestinal tract was assessed endoscopically. A gastric emptying study was performed at 3, 6, and 12 months after surgery. The meal used in this dual-phase study had solid and liquid phases. For the solid phase, 74 MBq of 99mTc sulfur colloid was injected into an egg, which was then hard-boiled. For the liquid phase, 18.5 MBq of (111)In-diethyltriaminopenta acetic acid (DTPA) were mixed into 150 ml of a commercial, elentary liquid diet. RESULTS Three months after surgery, the patients' main complaints were gastric stasis (25%), heartburn (8%) and belching (8%). The patients gradually became asymptomatic following surgery. Fifty-nine percent were asymptomatic at the 3-month follow-up, 84% at 6 months, and 92% at 12 months. There was no evidence of reflux esophagitis or gastritis after the 3-month follow-up. One patient developed a complicated duodenal ulcer. Initially, the patients all had prolonged gastric emptying of the dual phase meal, compared to normal individuals. The T1/2 for liquid meal emptying was 87+/-18 min at 3 months, 77+/-20 min at 6 months and 50+/-5 min at 1 year after surgery. The last value is the same as for healthy individuals. Solid meal emptying was still prolonged, with an emptying rate of 36+/-9.7% at 2 hours, one year after surgery. CONCLUSIONS Segmental gastrectomy patients experienced prolonged gastric emptying in the early post-operative period. This improved in the first year after surgery. The quality of life for patients who underwent segmental gastrectomy has been reasonably good in the follow-up period to date.
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Nakanishi Y, Bai F, Takayama K, Pei XH, Inoue K, Osaki S, Izumi M, Takaki Y, Hara N, Tokiwa H, Masuda Y. [Effect of PCBs on mouse lung tumorigenesis induced by 1-nitropyrene: a preliminary report]. FUKUOKA IGAKU ZASSHI = HUKUOKA ACTA MEDICA 1999; 90:231-7. [PMID: 10396879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
We have analyzed the effect of polychlorinated biphenyls (PCB, Kanechlor-400) on 1-nitropyrene (1-NP) induced lung tumor. Male A/J mice (6 weeks old) were used for the experiment. A total of 2.5 mg/kg PCB was administered intraperitoneally (PCB group), a total of 0.38 mmol/kg 1-NP was administered intraperitoneally for 17 times (1-NP group), PCB was administered followed by i.p. injection of 1-NP (PCB + 1-NP group), and only vehicle was administered (control group). The lung lesions induced were examined 18 weeks after the final treatment with 1-NP or vehicle. In control group, no neoplastic lesion in the lung was induced. In PCB group, only one lesion with adenoma was induced. In 1-NP group, various kinds of lung neoplastic lesions including hyperplasia, adenoma and adenocarcinoma were induced. In PCB + 1-NP group, both the number and size of tumors induced were significantly more than those in 1-NP group. In addition, the number of adenocarcinoma formed was more in PCB + 1-NP group than in 1-NP group. Each lesion was microdissected to collect and analyze DNA of the targeted tissue. K-ras gene mutation was detected in part of adenoma lesions and all the carcinoma lesions. The mutation was found in either 1-NP or PCB + 1-NP group, but not in control and PCB group. The pattern of K-ras mutation was CAA to CGA in codon 61 or GGT to GAT in codon 12. There was no difference in the pattern of K-ras mutation despite of the pretreatment with PCB. Although the present data are from small sample size, it was suggested that PCB may promote (but not initiate) 1-NP induced lung tumorigenesis, and may not induce K-ras mutation directly in the experimental system.
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Izumi M, Fujiwara S, Takagi M, Kanaya S, Imanaka T. Isolation and characterization of a second subunit of molecular chaperonin from Pyrococcus kodakaraensis KOD1: analysis of an ATPase-deficient mutant enzyme. Appl Environ Microbiol 1999; 65:1801-5. [PMID: 10103287 PMCID: PMC91257 DOI: 10.1128/aem.65.4.1801-1805.1999] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
The cpkA gene encoding a second (alpha) subunit of archaeal chaperonin from Pyrococcus kodakaraensis KOD1 was cloned, sequenced, and expressed in Escherichia coli. Recombinant CpkA was studied for chaperonin functions in comparison with CpkB (beta subunit). The effect on decreasing the insoluble form of proteins was examined by coexpressing CpkA or CpkB with CobQ (cobyric acid synthase from P. kodakaraensis) in E. coli. The results indicate that both CpkA and CpkB effectively decrease the amount of the insoluble form of CobQ. Both CpkA and CpkB possessed the same ATPase activity as other bacterial and eukaryal chaperonins. The ATPase-deficient mutant proteins CpkA-D95K and CpkB-D95K were constructed by changing conserved Asp95 to Lys. Effect of the mutation on the ATPase activity and CobQ solubilization was examined. Neither mutant exhibited ATPase activity in vitro. Nevertheless, they decreased the amount of the insoluble form of CobQ by coexpression as did wild-type CpkA and CpkB. These results implied that both CpkA and CpkB could assist protein folding for nascent protein in E. coli without requiring energy from ATP hydrolysis.
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Ohwada S, Nakamura S, Ogawa T, Izumi M, Tanahashi Y, Sato Y, Ikeya T, Iino Y, Morishita Y. Segmental gastrectomy for early cancer in the mid-stomach. HEPATO-GASTROENTEROLOGY 1999; 46:1229-33. [PMID: 10370697] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/13/2023]
Abstract
BACKGROUND/AIMS We modified the surgical procedure for segmental gastrectomy, which is normally used for peptic ulcers, to treat early gastric cancer of the mid-stomach. In this paper, we describe the surgical technique and its results. METHODOLOGY The location of the tumor was confirmed by intra-operative endoscopic examination. An area 2 cm proximal and distal to the tumor was marked with sutures. Firstly, the lymph nodes were dissected from around the perigastric and along the left gastric and common hepatic arteries. Then, a segmental gastrectomy was performed. The greater omentum, omental sac, and vagal nerve, including the hepatic, pyloric and celiac rami, were left intact. An end-to-end gastrogastrostomy was performed using Gambee's sutures and 4-0 monofilament polydioxanone. Gastric drainage was not necessary. RESULTS We performed segmental gastrectomies on 30 patients. Tumors less than 1 cm in diameter were found in 4 patients; 1.1-2 cm in 14, 2.1-5 cm in 11, and a tumor exceeding 5.1 cm in one patient. The cancer was confined to the mucosa in 23 patients; in the other 7, it had penetrated the submucosa. No lymph node metastases were found but 2 patients had microscopic invasion or permeation of the lymphatic vessels. One patient required post-operative balloon dilation of the pyloric sphincter for delayed gastric emptying. The remaining patients had no post-operative complications. To date, 29 patients, excluding one who died in a traffic accident, have survived disease-free for a mean of 30 months (range: 7-51). Their body weight and dietary volume returned to pre-operative levels within 12 months of surgery. CONCLUSIONS Patients who underwent segmental gastrectomy have had a reasonably good quality of life in the post-operative follow-up to date.
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Kuramoto T, Iwamoto K, Izumi M, Kirihata M, Yoshizako F. Asymmetric reduction of ethyl 2-methyl 3-oxobutanoate by Chlorella. Biosci Biotechnol Biochem 1999; 63:598-601. [PMID: 10227152 DOI: 10.1271/bbb.63.598] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Chlorella pyrenoidosa Chick reduced ethyl 2-methyl 3-oxobutanoate to the corresponding alcohols with the diastereomer (anti/syn) ratio of 53/47. The enantiomer excesses of anti-(2S, 3S)- and syn-(2S, 3R)-hydroxy esters were 89 and > 99ee% respectively. C. vulgaris and C. regularis afforded predominantly the syn-isomer, contrary to C. pyrenoidosa. The differences in the activity of reducing ethyl 2-methyl 3-oxobutanoate were observed among three strains of Chlorella. Addition of 2% metal salts slightly increased the chemical yield of the hydroxy ester.
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Sumi M, Izumi M, Yonetsu K, Nakamura T. Sublingual gland: MR features of normal and diseased states. AJR Am J Roentgenol 1999; 172:717-22. [PMID: 10063867 DOI: 10.2214/ajr.172.3.10063867] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
OBJECTIVE We describe the MR features of the sublingual gland in normal and diseased states. SUBJECTS AND METHODS We used MR imaging to assess age-related changes in size and signal intensity of normal sublingual glands in 60 control subjects. The MR features of sublingual glands were also studied in 70 patients with cancer, cellulitis of the sublingual space, Sjögren's syndrome, or ranula. RESULTS MR imaging efficiently revealed normal sublingual glands. On T1-weighted images, the MR signal intensity of the sublingual gland was lower than that of the surrounding fat but higher than that of muscle. The sublingual glands showed age-related decreases in size, with approximately 25% of the thickness present in the second decade of life being lost by the seventh decade. T1-weighted signal intensity of the parotid gland increased with age, but the signal intensity of the sublingual and submandibular glands did not. T1-weighted signal intensity of carcinomas in and near the sublingual space was lower than that of the sublingual glands, but T2-weighted signal intensity of carcinomas exceeded that of the glands. Gadolinium enhancement occasionally diminished the contrast between invading carcinomas and the glands. T1-weighted MR imaging showed that sublingual glands affected by Sjögren's syndrome exhibit features analogous to those of the other major salivary glands; however, the sublingual glands seemed to be less severely involved overall in this syndrome than the other major glands. We found that using fat suppression and short inversion time inversion recovery may be useful for assessment of sialadenitis of the gland. CONCLUSION MR imaging is useful in depicting normal and diseased states of the sublingual gland.
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Ohwada S, Ogawa T, Nakamura S, Satoh Y, Takeyoshi I, Iwazaki S, Izumi M, Iino Y, Morishita Y. Left colon substitution with His' angle following total gastrectomy. Surgical technique using stapling devices. Dig Surg 1999; 16:12-5. [PMID: 9949261 DOI: 10.1159/000018687] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
Abstract
To resolve the disadvantages of jejunal Roux-en-Y reconstruction following total gastrectomy, we attempted the use of left colon substitution with all anastomoses conducted using mechanical stapling devices. A His' angle was formed to reduce regurgitation esophagitis. About 25 cm of the left colon with the ascending branch of the left colic artery with an adequate blood supply was brought up to the remnant esophagus without tension on the mesentery. The colon graft was interposed between the esophagus and duodenum in an isoperistaltic fashion. Three anastomoses, esophagocolic, duodenocolic and colocolic, were completed with a circular stapling device. An end-to-side esophagocolonostomy was positioned about 3 cm distal from the blind end of the proximal colon stump. The proximal end of the left colon was pexied to the esophagus using 3-4 stitches to make a new His' angle. Gastrointestinal continuity was restored by a side-to-end colonoduodenostomy and an end-to-end colonocolonostomy. Fifteen gastric cancer patients underwent left colon substitution following total gastrectomy. The circular staple used for esophagocolonostomy and colonoduodenostomy was 25 mm in all patients, and for colonocolonostomy was 29 mm in 9 patients and 33 mm in 6 patients. No problems were encountered in any steps of the procedure, and faulty stapling was avoided. Neither anastomotic leakage nor necrosis of the interposed colon segment was seen, nor was late anastomotic stricture, in any patient. Barium radiograms of the interposed colon segment showed that the capacity and passage of the interposed colon were adequate, and regurgitation did not occur. Diet volume was satisfactory and weight loss minimal.
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Horie H, Tsutamoto T, Ishimoto N, Minai K, Yokohama H, Nozawa M, Izumi M, Takaoka A, Fujita T, Sakamoto T, Kito O, Okamura H, Kinoshita M. Plasma brain natriuretic peptide as a biochemical marker for atrioventricular sequence in patients with pacemakers. Pacing Clin Electrophysiol 1999; 22:282-90. [PMID: 10087542 DOI: 10.1111/j.1540-8159.1999.tb00440.x] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
We hypothesized that plasma brain natriuretic peptide, like plasma atrial natriuretic peptide, may reflect hemodynamic changes elicited by different cardiac pacing modes. The aim of this study was to investigate whether plasma brain natriuretic peptide could be influenced by different pacing modes or electrical stimulation. The subjects consisted of 164 patients with permanent pacemakers (52 VVI, 30 AAI, 82 DDD pacemakers) and unimpaired heart function. Patients with atrial fibrillation or spontaneous beats were excluded. Plasma atrial natriuretic peptide and brain natriuretic peptide levels were measured at a rate of 70 beats/min after 45 minutes in the supine position. Under ECG monitoring, the pacing mode was switched from DDD to VVI in 12 patients and from DDD to AAI in 4 patients with a dual chamber pacemaker. Plasma atrial natriuretic peptide and brain natriuretic peptide levels were also measured 30 minutes, 60 minutes, and 1 week after mode switching. Plasma atrial natriuretic peptide and brain natriuretic peptide levels were significantly higher in the nonphysiological pacing group than in the physiological pacing group, whereas these values were similar in the DDD and AAI pacing groups. One week after switching from DDD to VVI, plasma atrial natriuretic peptide and brain natriuretic peptide levels were significantly increased, however no significant changes were observed after switching to AAI. Based on a multivariate regression analysis of noninvasive clinical parameters, only a low plasma brain natriuretic peptide was significantly correlated with physiological pacing. We conclude that: (1) plasma brain natriuretic peptide, like atrial natriuretic peptide, is influenced by the pacing mode, but is not influenced by electrical stimulation; and (2) low plasma brain natriuretic peptide is important in relation to physiological pacing.
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Ogawa T, Ohwada S, Sato Y, Izumi M, Nakamura S, Takeyoshi I, Kawashima Y, Ohya T, Koyama T, Morishita Y. Effects of 5'-DFUR and lentinan on cytokines and PyNPase against AH66 ascites hepatoma in rats. Anticancer Res 1999; 19:375-9. [PMID: 10226570] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023]
Abstract
Pyrimidine nucleoside phosphorylase (PyNPase) is an enzyme which converts 5'-deoxy-5-fluorouridine (5'-DFUR) to 5-fluorouracil (5-FU), and is induced by various cytokines in tumor cells. We evaluated a combination of 5'-DFUR and lentinan which is widely used as a biological response modifier (BRM), to verify antitumor effects, the induction of cytokines such as tumor necrosis factor (TNF)-alpha and latent transforming growth factor (TGF)-beta, and PyNPase activity against AH66 ascites hepatoma cells in rats. AH66 ascites hepatoma cells were subcutaneously injected into the backs of Donryu rats. Rats were randomly assigned to a group receiving either 5'-DFUR or lentinan alone, to a group receiving both 5'-DFUR and lentinan, or to a control group. 5'-DFUR was administered orally, and lentinan was administered intraperitoneally. The tumor size, PyNPase activity in the tumor and spleen, and TNF-alpha and TGF-beta in the tumor were examined. The results were as follows. a) Tumor growth was significantly (P < 0.05) inhibited in both the 5'-DFUR group and the 5'-DFUR + Lentinan group when compared to the control group. Tumor growth in the 5'-DFUR + Lentinan group was significantly (P < 0.01) inhibited compared to that in both the 5'-DFUR group and the Lentinan group. b) PyNPase activity in the tumor was significantly (P < 0.01) higher in each group than in the spleen. In the tumor, PyNPase activity was significantly (P < 0.01) higher in the Lentinan group compared to the control group. In the 5'-DFUR + Lentinan group PyNPase activity in the tumor was significantly (P < 0.01) lower compared to the Lentinan group. c) Levels of TNF-alpha and TGF-beta production in the tumor were significantly (P < 0.05) lower in the 5'-DFUR + Lentinan group compared to the control group. These findings suggested that PyNPase activity in the tumor was induced by lentinan but not so in the spleen, and lentinan increased the susceptibility of tumor cells to 5'-DFUR.
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Horie H, Takahashi M, Minai K, Izumi M, Takaoka A, Nozawa M, Yokohama H, Fujita T, Sakamoto T, Kito O, Okamura H, Kinoshita M. Long-term beneficial effect of late reperfusion for acute anterior myocardial infarction with percutaneous transluminal coronary angioplasty. Circulation 1998; 98:2377-82. [PMID: 9832481 DOI: 10.1161/01.cir.98.22.2377] [Citation(s) in RCA: 100] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
BACKGROUND Although the short-term and long-term beneficial effects of early coronary revascularization by primary PTCA or thrombolytic therapy have been established for acute myocardial infarction, thrombolytic therapy >24 hours after the onset of acute myocardial infarction has not been shown to improve clinical outcome. The purpose of this study was to assess the effect of late revascularization by primary PTCA over a 5-year period. METHODS AND RESULTS Eighty-three patients with initial Q-wave anterior myocardial infarction >24 hours after onset were randomized into a PTCA group (n=44) and a no-PTCA group (n=39). Long-term follow-up was conducted with regard to end points, which included cardiac death, nonfatal recurrence of myocardial infarction, and development of congestive heart failure. Left ventricular ejection fraction and regional wall motion at 6 months after myocardial infarction were similar in the 2 groups. Left ventricular end-diastolic and end-systolic volume indexes were significantly smaller in the PTCA group than in the no-PTCA group (P<0.0001). With cardiac events as end points, a 5-year Kaplan-Meier event-free survival analysis revealed that the no-PTCA group had a worse prognosis than the PTCA group (P<0.0001). Patency of the infarct-related artery, left ventricular ejection fraction, end-diastolic volume index, and end-systolic volume index were significantly associated with cardiac events by a Cox proportional hazards analysis (hazard ratios 0.120, 0.845, 1.065, and 1.164, respectively). CONCLUSIONS In initial Q-wave anterior myocardial infarction, we conclude that even with late reperfusion, PTCA had beneficial effects on cardiac events over the 5-year period after myocardial infarction, with the prevention of left ventricular dilation after myocardial infarction being a possible mechanism.
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Izumi M, Terao S, Nakamori T, Inoue H, Mitsuma T, Yamada H, Nakayama M. [Cerebral infarction associated with nephrotic syndrome in a young adult: a case report]. NO TO SHINKEI = BRAIN AND NERVE 1998; 50:1119-24. [PMID: 9989358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
Abstract
We report a 19-year-old man who developed a cerebral infarction in the territory of the anterior choroidal artery and showed a hypercoagulable state and nephrotic syndrome after diarrhea and appetite loss. He had suffered from nephrotic syndrome from the age of three and had been treated for five years. MR-angiography showed an occlusion originating in the right internal carotid artery. The right anterior and middle cerebral arteries were imaged from the left internal carotid artery via the anterior communication artery. He showed symptoms of left hemiparesis, agnosia, loss of activity, anasarca and left hypacusis following his clinical course, but had recovered from all but left hemiparesis following medical treatments including steroid therapy. The histologic finding by a renal biopsy revealed focal glomerulosclerosis. In this case, we considered that when he was in a hypercoagulable state and had a second attack of nephrotic syndrome because of inflammation and dehydration due to diarrhea and appetite loss, his hypercoagulable state grew worse, and he then developed a cerebral infarction. When one see a patient with nephrotic syndrome, one should be attentive to the possibility of a complication of cerebral infarction.
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