S Aoki

Aichi Medical University, Okazaki, Aichi, Japan

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Publications (9)28.85 Total impact

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    ABSTRACT: Abstract An autopsy case of an 11-year-old boy with polyarteritis nodosa is described in which the onset of the disease was associated with the presence of hepatitis B (HB) antigens (Ag) in the cytoplasm and nuclei of hepatocytes as detected by immunohistological methods. Deposits of HBsAg, HBeAg, IgG, IgM, C3, and C1q were demonstrated in systemic vascular lesions. It is considered that the arteritis was due to deposition in the arteries of immune complexes formed by HBAg and HB antibodies.
    Modern Rheumatology 12/2000; 10(4):267-271. · 1.72 Impact Factor
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    ABSTRACT: Two different kinds of calcium phosphate cement were developed for implant fixation: cement A comprised of alpha-tricalcium phosphate (alpha-TCP) 95% and dicalcium phosphate dihydrate (DCPD) 5%, and cement B comprised of alpha-tricalcium phosphate 90% and dicalcium phosphate dihydrate 10%. The compression strength and pullout force of the new materials were tested both in vitro and in vivo. Microscopic observations were performed on the interface between bone and cement. Cement A showed a greater mechanical strength than cement B. The results suggest the clinical possibility of this calcium phosphate cement, which could be used as a material for enhancing implant fixation.
    Biomaterials 10/1998; 19(17):1587-91. · 8.31 Impact Factor
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    ABSTRACT: A 68-year-old man who worked as an editor was admitted to Aichi Medical University Hospital due to dyspnea on exertion and emaciation. The patient had noticed rapid weight loss during diet therapy for diabetes mellitus that started in the beginning of July, 1993. Laboratory examinations revealed elevated levels of LDH and amylase in serum. Ultrasonography disclosed minimal ascites. Dyspnea on exertion developed in September, 1993. Chest roentgenography showed diffuse bilateral small nodular or reticular opacities. CT-guided percutaneous needle aspiration was done and cytologic examination of a specimen of lung tissue revealed papillary adenocarcinoma. The diagnosis was bronchiolo-alveolar carcinoma. Serum levels of amylase were elevated. The amylase isozyme pattern was of the salivary type. Serum levels of CA19-9 and CEA were also elevated. The patient died of respiratory failure on December 4, 1993. Postmortem examination revealed diffuse small nodules in both lungs. Examination of the nodules showed bronchiolo-alveolar cell carcinoma. The tumor cells stained positively for amylase (salivary type, not pancreatic type) CA19-9, and CEA by the avidin biotin complex method, but they were immunohistologically negative for AFP. We conclude that this lung cancer produced amylase, CA19-9, and CEA. We know of only a few reports of cases in which lung cancer produced both amylase and CA19-9.
    Nihon Kyōbu Shikkan Gakkai zasshi 05/1997; 35(4):426-31.
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    ABSTRACT: To study antibodies to Escherichia coli O:14, which expresses large amounts of enterobacterial common antigen (ECA), and their corresponding antigen molecules in serum and synovial fluid samples from patients with rheumatoid arthritis (RA). Enzyme linked immunosorbent assay (ELISA) was used to measure antibodies to heat killed E coli O:14 in serum and synovial fluid samples from patients with RA and control subjects including healthy donors and patients with osteoarthritis. ELISA was also used to perform absorption analyses of antibodies to E coli O:14 with several enteric bacteria and their lipopolysaccharide (LPS). In addition, antigenic molecules reacting with E coli O:14 antibodies from patients with RA were examined using immunoblot analysis and N-terminal amino acid analysis. Compared with control subjects, patients with RA showed significantly increased titres of antibodies against heat killed E coli O:14 in 33 of 83 serum samples (39.8%) and 38 of 58 joint fluid samples (65.5%). Absorption analyses with enteric bacteria and their LPS resulted in the reduction of antibody titres to heat killed E coli O:14 in serum and synovial fluid samples from the RA patients. In addition, immunoblot analysis of the samples from RA patients revealed not only a ladder-like banding pattern equivalent to ECA associated with LPS, but also two clear bands of bacterial outer membrane proteins of 35 kDa (Omp A) and 38 kDa (Omp C), having amino acid sequence homology with those of other Enterobacteriaceae. These results suggest that some patients with RA are sensitised to antigens common to Enterobacteriaceae, and this may prove relevant to the future development of immunotherapy for RA. Furthermore, this sensitisation to antigens found commonly in Enterobacteriaceae may have a key role in the pathogenesis of human RA similar to that described previously in our animal model.
    Annals of the Rheumatic Diseases 07/1996; 55(6):363-9. · 9.11 Impact Factor
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    ABSTRACT: In rheumatoid arthritis, pannus formation resulting from synovial inflammation is a major factor in cartilage destruction. The ability of arthritic synovial cells to undergo pannus formation depends upon their initial adhesion to the partially deformed cartilage surfaces. Our recent studies using various lipid-derivatized glycosaminoglycans have revealed a preeminent inhibitory activity of phosphatidyl ethanol amine-derivatized chondroitin sulphate (CS-PE) toward cell-matrix adhesion. Here we evaluate whether CS-PE may protect articular cartilage from pannus extension in different in vitro and in vivo model systems using Escherichia coli 0:14-induced arthritis in rabbits and the articular cartilage explants, synovial tissues, and synovial cells obtained from them. These studies showed that CS-PE suppressed the in vivo pannus-like extension on cartilage surfaces, as well as the in vitro extension of the synovial cell layer on both CS-PE treated culture plates and cartilage explants. The results suggest that native chondroitin sulphate proteoglycans in the surface of normal articular cartilage play an important role in protecting the tissues from pannus extension and that the CS-PE immobilized onto partially eroded cartilage can mimic the inhibitory action of native chondroitin sulphate proteoglycans.
    International Journal of Experimental Pathology 11/1995; 76(5):369-79. · 2.04 Impact Factor
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    ABSTRACT: The distribution of glucokinase in rat liver under both normal feeding and fasting-refeeding conditions was investigated immunohistochemically. Under normal feeding conditions, glucokinase immunoreactivity was observed in both nuclei and cytoplasm of parenchymal cells. The nuclei were stained intensely and evenly, whereas the cytoplasm showed weak immunoreactivity of different degrees of staining intensity depending on the location of the cells. The cytoplasm of perivenous hepatocytes was stained more intensely, though not so much more, than that of periportal hepatocytes. The cytoplasm of hepatocytes surrounding the terminal hepatic venule (THV), of hepatocytes surrounding the portal triad, and of some other hepatocytes showed a stronger immunoreactivity than that of residual hepatocytes. The nuclear immunoreactivity in hepatocytes surrounding the portal triad and in some other hepatocytes was weak or absent, and positive immunoreactivity was detected at the plasma membrane of some of these cells. After 72 h of fasting, glucokinase immunoreactivity was markedly decreased in all hepatocytes. After the start of refeeding, the cytoplasmic immunoreactivity began to increase first in the parenchymal cells surrounding the THV and extended to those in the intermediate zone followed by those in the periportal zone. In contrast, the increase in nuclear immunoreactivity started in hepatocytes situated in the intermediate zone adjacent to the perivenous zone and then extended to those in the perivenous zone followed by those in the periportal zone. Hepatocytes surrounding either THV or portal triad showed a distinctive change in immunoreactivity during the refeeding period. After 10 h of refeeding, strong immunoreactivity was observed in both the cytoplasm and the nuclei of all hepatocytes, and appreciable glucokinase immunoreactivity was detected at the plasma membrane of some hepatocytes. These findings are discussed from the standpoint of a functional role of glucokinase in hepatic glucose metabolism.
    Histochemie 02/1995; 103(1):31-8. · 2.61 Impact Factor
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    ABSTRACT: By an immunohistochemical technique, we examined changes in the subcellular distribution of rat liver glucokinase in response to external stimuli. Glucokinase immunoreactivity was found predominantly in the nucleus of hepatocytes. In situ perfusion of the liver with 20 mM glucose for 10 min caused a marked decrease in nuclear immunoreactivity and an increase in cytoplasmic immunoreactivity. Insulin (10 nmol/l) potentiated this glucose effect. However, no change took place when 5 mM glucose was perfused. These results indicate that glucokinase is translocated from the nucleus to the cytoplasm in response to a high concentration of glucose.
    Biochemical and Biophysical Research Communications 11/1994; 204(1):252-6. · 2.41 Impact Factor
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    ABSTRACT: Subcellular distribution of glucokinase was studied in rat liver. With an immunohistochemical procedure, glucokinase immunoreactivity was clearly shown in the nucleus of parenchymal cells of rat liver, but faintly in the cytoplasm. Nuclei, cytosol (extranuclear fraction in the strict sense), and homogenate prepared in nonaqueous medium, i.e. glycerol, were analyzed for glucokinase by both immunoblotting and activity measurement. Such analyses demonstrated that glucokinase concentration was far higher in the nuclei than in the cytosol when compared on the basis of total protein content and that total glucokinase activity in the cytosolic fraction was about 1.8 times that in the nuclear fraction. These results indicate that hepatocyte glucokinase is present in the nucleus as well as in the cytoplasm in contradiction to the widespread belief of its exclusive localization in the cytoplasm.
    Biochemistry international 12/1990; 22(4):759-67.
  • S Aoki, T Mitsui
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    ABSTRACT: To ascertain whether clinically diagnosed rheumatoid arthritis (RA) patients having antibodies to enterobacterial common antigens (ECA) in synovial fluid (SF) have a histological appearance characteristic of RA synovitis. Twenty-five RA patients for which synovial biopsy specimens were preserved, were selected from 58 patients with RA tested for antibodies to ECA in SF The synovial tissue specimens were examined histologically using a semiquantitative scoring system with quantitative counts. The correlation of anti-ECA antibody levels with total scores for synovitis and laboratory markers in three RA patient groups (markedly positive, moderately to slightly positive, and negative according to anti-ECA antibody levels) was analyzed statistically. Histologic examination in the markedly positive RA group (total score for synovitis, range 18-20 points) revealed typical histological features of rheumatoid synovitis. Total scores for synovitis were significantly higher in both the markedly positive and moderately to slightly positive RA groups than in the negative RA group. A comparison of anti-ECA antibody levels with total scores for synovitis revealed a strong and significant correlation. Furthermore, levels of anti-ECA antibodies were also correlated with rheumatoid factor and C-reactive protein. Clinically diagnosed RA patients having anti-ECA antibodies in SF showed typical or characteristic histological features of RA synovitis. Our data suggest that a group of RA patients with an entrobacterial etiology exists in larger groups of patients with RA which is thought to be a heterogeneous disease.
    Clinical and experimental rheumatology 23(1):13-8. · 2.66 Impact Factor

Publication Stats

119 Citations
28.85 Total Impact Points

Institutions

  • 1996–2000
    • Aichi Medical University
      • • Institute for Medical Science of Aging
      • • Department of Pathology
      Okazaki, Aichi, Japan
  • 1990–1995
    • Meijo University
      • Faculty of Pharmacy
      Nagoya-shi, Aichi-ken, Japan