Author Iwamuro, Masaya| Ohya, Shogen| Yoshioka, Masao| Nasu, Tatsuyo| Ogawa, Tsuneyoshi| Ito, Mamoru| Ishiyama, Shuhei| Fujiwara, Akiko| Shiode, Junji| Yamamoto, Kazuhide| Itoshima, Tatsuya|
Published Date 2005-09-01
Publication Title 岡山医学会雑誌
Volume volume117
Issue issue2
Content Type Journal Article
Author Yamamoto, Kazuhide|
Published Date 2008-12-01
Publication Title 岡山医学会雑誌
Volume volume120
Issue issue3
Content Type Journal Article
Author Oka, Takahiko| Tomoda, Jun| Kobashi, Haruhiko| Sakai, Nobuyuki| Sakaguchi, Kohsaku| Yamamoto, Kazuhide| Higashi, Toshihiro| Ito, Toshio| Yamada, Gotaro| Tsuji, Takao|
Published Date 1994
Publication Title 岡山医学会雑誌
Volume volume106
Issue issue5-6
Content Type Journal Article
Author Fukuda, Tetsuya| Yamada, Gotaro| Ogawa, Hiromichi| Okushin, Hiroaki| Hyodo, Ichinosuke| Nishihara, Takashi| Mizuno, Motowo| Sakamoto, Yuji| Nagashima, Hideo| Yamamoto, Kazuhide| Kobayashi, Toshinari| Yoshida, Tomoro|
Published Date 1984-04-30
Publication Title 岡山医学会雑誌
Volume volume96
Issue issue3-4
Content Type Journal Article
Author Hirao, Ken| Kawamoto, Hirofumi| Yamamoto, Kazuhide|
Published Date 2009-12-01
Publication Title 岡山医学会雑誌
Volume volume121
Issue issue3
Content Type Journal Article
Author Ogawa, Tsuneyoshi| Kawamoto, Hirofumi| Yamamoto, Kazuhide|
Published Date 2009-12-01
Publication Title 岡山医学会雑誌
Volume volume121
Issue issue3
Content Type Journal Article
JaLCDOI 10.18926/AMO/30943
FullText URL fulltext.pdf
Author Miyake, Yasuhiro| Yamamoto, Kazuhide|
Abstract <p>Autoimmune hepatitis (AIH) is a chronic and progressive disease characterized by histological interface hepatitis, hypergammaglobulinemia, and circulating autoantibodies. Multiple factors, including molecular mimicry, a genetic background including major histocompatibility complex class II, and defective function of regulatory T-cells, are involved in the pathogenesis. The diagnosis is made based on the scoring system of the International Autoimmune Hepatitis Group, the sensitivity and specificity of which are90%, respectively. AIH is classified into 3 sub-types based on the profiles of circulating autoantibodies: anti-nuclear antibody and/or smooth muscle antibody-positive (type 1), anti-liver-kidney microsomal antibody-positive (type 2), and anti-soluble liver antigen/liver-pancreas antigen antibody- positive (type 3). Recently, however, the number of atypical cases lacking the usual features has increased-for example, patients with acute-onset or fulminant-type AIH, autoantibody-negative patients, male patients, and patients with bile duct injury-and thus the clinical features of AIH have been diversified. AIH is responsive to immunosuppressive treatment in most cases; however, relapse occurs in more than 80% of patients within 1 year after immunosuppressive treatment withdrawal. The 10-year survival rate and the 10-year hepatocellular carcinoma-free rate are90%, respectively, indicating that some patients reach liver failure or develop hepatocellular carcinoma. To improve the prognosis of these patients, persistent normalization of transaminase is required.</p>
Keywords autoimmune hepatitis epidemiology pathogenesis diagnosis prognosis
Amo Type Review
Published Date 2008-08
Publication Title Acta Medica Okayama
Volume volume62
Issue issue4
Publisher Okayama University Medical School
Start Page 217
End Page 226
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
File Version publisher
Refereed True
PubMed ID 18766204
Web of Science KeyUT 000258680900001
JaLCDOI 10.18926/AMO/30997
FullText URL fulltext.pdf
Author Yamamoto, Kazuhide| Makino, Yasuhiro| Itoshima, Tatsuya| Kobayashi, Toshinari| Tsuji, Takao|
Abstract <p>Phalloidin, a toxin from the plant Amanita phalloides, irreversibly polymerizes actin filaments and causes cholestasis. Three-dimensional structural changes induced by phalloidin in the bile canaliculi and the intra-acinar localization of these changes were studied in the rat liver by scanning and transmission electron microscopy. After 3 days of treatment, canalicular changes appeared mainly in zones 2 and 3 of Rappaport's acinus, but after 7 days of treatment changes occurred in bile canaliculi of the whole acinus. The changes in the bile canaliculi included tortuosity, saccular dilatation, loss of microvilli, bleb formation and elongation of canalicular side branches. Some side branches extended near to Disse's space, leaving only a thin cytoplasmic rim between the canalicular lumen and Disse's space. Kupffer cells were occasionally situated near such extended bile canaliculi and protruded their processes into the hepatic cord. These results suggest that bile canaliculi in zone 3 are more susceptible to phalloidin toxicity than those in zone 1 and that biliary constituents may leak from such altered bile canaliculi.</p>
Keywords phalloidin bile canaliculi choletasis
Amo Type Article
Published Date 1988-08
Publication Title Acta Medica Okayama
Volume volume42
Issue issue4
Publisher Okayama University Medical School
Start Page 207
End Page 213
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
File Version publisher
Refereed True
PubMed ID 3177006
Web of Science KeyUT A1988P884600004
JaLCDOI 10.18926/AMO/31029
FullText URL fulltext.pdf
Author Makino, Yasuhiro| Yamamoto, Kazuhide| Tsuji, Takao|
Abstract <p>The three-dimensional arrangement of ductular structures formed by oval cells in rats fed 2-acetylaminofluorene (2-AAF) was studied by scanning electron microscopy (SEM) of biliary tract casts and light microscopy of sections of liver injected with india ink via the biliary tract. Both resin and india ink were well injected up to bile ductules, and the findings of each method correlated with each other. By the second week after 2-AAF administration, a few oval cells appeared in the periportal areas forming ductular structures which connected with the portal bile ducts. At the 4th week, increased ductular structures occupied two thirds of the lobule and formed networks communicating with each other, and with the portal bile ducts. At the 8th week, such ductular structures were compressed around hyperplastic nodules and appeared like a basket in biliary casts examined by SEM. Although a histochemical study of gamma-glutamyl transpeptidase revealed activity both on the luminal side of the ductular structures and hepatocytes in hyperplastic nodules, no transition was observed between these two cell populations. These results suggest that oval cells have characteristics more similar to those of biliary epithelia than of hepatocytes, and have no relation to the development of hyperplastic nodules.</p>
Keywords oval cells biliary tract casts scanning electron microscopy hyperplastic nodules hepatocarcinogenesis
Amo Type Article
Published Date 1988-06
Publication Title Acta Medica Okayama
Volume volume42
Issue issue3
Publisher Okayama University Medical School
Start Page 143
End Page 150
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
File Version publisher
Refereed True
PubMed ID 2899946
Web of Science KeyUT A1988P034000004
Author Tsutsumi, Koichiro| Kawamoto, Hirofumi| Yamamoto, Kazuhide|
Published Date 2010-12-01
Publication Title 岡山医学会雑誌
Volume volume122
Issue issue3
Content Type Journal Article
Author Fujii, Masakuni| Kawamoto, Hirofumi| Yamamoto, Kazuhide|
Published Date 2010-12-01
Publication Title 岡山医学会雑誌
Volume volume122
Issue issue3
Content Type Journal Article
Author Hiraoka, Sakiko| Kato, Jun| Fujiki, Shigeatsu| Kaji, Eisuke| Morikawa, Tamiya| Murakami, Takatoshi| Nawa, Toru| Kuriyama, Motoaki| Uraoka, Toshio| Ohara, Nobuya| Yamamoto, Kazuhide|
Published Date 2011-08-01
Publication Title 岡山医学会雑誌
Volume volume123
Issue issue2
Content Type Journal Article
Author Asagi, Akinori| Ohta, Koji| Nasu, Junichirou| Tanada, Minoru| Nadano, Seijin| Nishimura, Rieko| Teramoto, Norihiro| Yamamoto, Kazuhide| Inoue, Takeshi| Iguchi, Haruo|
Published Date 2013-01
Publication Title Pancreas
Volume volume42
Issue issue1
Content Type Journal Article
Author Onji, Masahiro| Kanno, Atsuo| Saitoh, Shin-Ichiroh| Fukui, Ryutaro| Motoi, Yuji| Shibata, Takuma| Matsumoto, Fumi| Lamichhane, Aayam| Sato, Shintaro| Kiyono, Hiroshi| Yamamoto, Kazuhide| Miyake, Kensuke|
Published Date 2013-06
Publication Title Nature Communications
Volume volume4
Content Type Journal Article
Author Takahara, Masahiro| Nemoto, Yasuhiro| Oshima, Shigeru| Matsuzawa, Yu| Kanai, Takanori| Okamoto, Ryuichi| Tsuchiya, Kiichiro| Nakamura, Tetsuya| Yamamoto, Kazuhide| Watanabe, Mamoru|
Published Date 2013-12
Publication Title Immunology Letters
Volume volume156
Issue issue1-2
Content Type Journal Article
JaLCDOI 10.18926/AMO/49667
FullText URL 67_2_93.pdf
Author Kita, Masahide| Yokota, Kenji| Okada, Hiroyuki| Take, Susumu| Takenaka, Ryuta| Kawahara, Yoshiro| Oguma, Keiji| Matsushita, Osamu| Yamamoto, Kazuhide|
Abstract Atrophy of the gastric mucosa is a precursor of intestinal-type gastric cancer, and Helicobacter pylori infection causes atrophic gastritis. The aim of this study was to determine whether the genetic diversity of H. pylori virulence genes is associated with the development and progression of gastric atrophy in humans. We isolated and cultured H. pylori strains from patients with gastric ulcer and duodenal ulcer accompanied by atrophic gastritis in background mucosa. H. pylori strains were stored at -80℃ prior to the experiments being carried out. We analyzed iceA, babA, vacA, cagA, and cagE genes by PCR. The cagA gene was analyzed through sequencing of the C-terminal region containing the EPIYA motif, which is related to tyrosine phosphorylation. Severe atrophy was observed in patients with gastric ulcer. The major phenotype of the vacA gene was s1c/m1 (93オ). The cagA gene was detected in all strains. The cagE gene was not detected in 2 and 5 strains from the mild cases and severe cases, respectively. The major cagA EPIYA motif, which is amino acids repeat in the C terminus, was the A-B-D type (44 of 58 strains). The virulence genes were not statistically associated with the severity of atrophy in the background gastric mucosa in humans. Not only identification of bacterial virulence factors but also studies of the host response will be necessary to investigate the progression of gastric atrophy and subsequent cancer development in humans.
Keywords Helicobacter pylori virulence genes chronic atrophic gastritis
Amo Type Original Article
Published Date 2013-04
Publication Title Acta Medica Okayama
Volume volume67
Issue issue2
Publisher Okayama University Medical School
Start Page 93
End Page 98
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
Copyright Holders CopyrightⒸ 2013 by Okayama University Medical School
File Version publisher
Refereed True
PubMed ID 23603925
Web of Science KeyUT 000317801700003
Related Url http://ousar.lib.okayama-u.ac.jp/metadata/52508
JaLCDOI 10.18926/AMO/30499
FullText URL fulltext.pdf
Author Okada, Hiroyuki| Mizuno, Motowo| Yamamoto, Kazuhide| Tsuji, Takao|
Abstract <p>To characterize primary sclerosing cholangitis (PSC) in Japanese patients and its association with inflammatory bowel disease (IBD), 155 reported cases of PSC, including 6 cases of our own, were reviewed. The prevalence of IBD was less in Japanese PSC patients than in Western patients (23% versus 62-100%). Japanese PSC patients with IBD were younger (mean age, 33.1 versus 51.8 years) and were more often women (51% versus 36%) than those without IBD. Seventy-four percent of PSC patients with IBD had extensive colonic lesions, and 89% of those developed IBD simultaneously, with or prior to PSC. There were 3 cases of neutrophilic cholangitis among the PSC patients with IBD but none in those without IBD. Based on these observations, we speculate that there may be subtypes of PSC which differ pathophysiologically.</p>
Keywords primary sclerosing cholangitis inflammatory bowel disease
Amo Type Article
Published Date 1996-10
Publication Title Acta Medica Okayama
Volume volume50
Issue issue5
Publisher Okayama University Medical School
Start Page 227
End Page 235
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
File Version publisher
Refereed True
PubMed ID 8914675
Web of Science KeyUT A1996VQ20600001
JaLCDOI 10.18926/AMO/31684
FullText URL fulltext.pdf
Author Ariyoshi, Masanori| MIzuno, Motowo| Morisue, Yoshiko| Shimada, Morizou| Fujita, Shirou| Nasu, Junichirou| Okada, Hiroyuki| Shimomura, Hiroyuki| Yamamoto, Kazuhide| Tsuji, Takao|
Abstract <p>We developed a monoclonal antibody (MoAb) (clone 5E8) against an antigen on the bile canalicular membrane of rat hepatocyte. By immunoblotting, MoAb 5E8 detected a band of 110 kD. In this study, we used the phage display technique to identify the target antigen recognized by MoAb 5E8. We screened a random phage display library expressing 12-mer peptide sequences and identified a peptide sequence, FHFNPYTGHPLT, as an epitope. We compared this peptide sequence with those of dipeptidyl peptidase IV (DPP IV, E.C.3.4.14.5) and Cell-CAM105, which proteins were located by a database search based on the information of tissue localization and approximate molecular weight of the MoAb 5E8 antigen, and sequence similarity with a region in DPP IV (amino acids 225-233) but not with Cell-CAM105 was found. In addition, we immunohistochemically stained various tissues (liver, small intestine, and kidney) of Japanese Fischer 344 rats, known to be deficient for DPP IV, with MoAb 5E8 and showed that the expression of MoAb 5E8 antigen was negligible or weak. In contrast, tissues sampled from the same organs of Sprague-Dawley rats, known to express DPP IV, were positively stained. These findings suggest that the antigen recognized by MoAb 5E8 is DDPIV and its major epitope is located in amino acids at positions 225-233.</p>
Keywords random phage display library dipeptidyl petidase IV monoclonal antibody epitope bile canalicular membrane
Amo Type Article
Published Date 2002-08
Publication Title Acta Medica Okayama
Volume volume56
Issue issue4
Publisher Okayama University Medical School
Start Page 187
End Page 191
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
File Version publisher
Refereed True
PubMed ID 12199523
Web of Science KeyUT 000177382600003
JaLCDOI 10.18926/AMO/31686
FullText URL fulltext.pdf
Author Ohya, Shogen| Mizuno, Motowo| Kawada, Mikihiro| Nasu, Junichirou| Okada, Hiroyuki| Shimomura, Hiroyuki| Yamamoto, Kazuhide| Fujita, Teizou| Tsuji, Takao|
Abstract <p>We have previously developed an enzyme-linked immunosorbent assay (ELISA) to measure stool decay-accelerating factor (DAF) and found that stool DAF concentrations were significantly elevated in patients with colorectal cancer, suggesting that the measurement of stool DAF may be valuable for the detection of colorectal cancer. In order to refine the assay for the measurement of stool DAF, we investigated 1) effects of centrifugation of stool samples, 2) effects of detergents, and 3) adequate combination of various anti-DAF monoclonal antibodies for the ELISA system using only monoclonal antibodies. We found that high-speed centrifugation could be omitted and that only the removal of large undigested food residues by centrifugation of short duration in a low-speed benchtop microcentrifuge sufficed to adequately prepare the stool samples. Addition of 2 detergents, octyl beta-glucoside and sodium deoxycholate, known to solubilize glycosyl-phosphatidylinositol-anchored proteins such as DAF, did not influence stool DAF values. By using 2 mouse anti-DAF monoclonal antibodies (clone 4F11 and 1C6), we were able to achieve a stable ELISA for the measurement of stool DAF using a uniform source of antibodies. The results should allow us to consistently apply the DAF assay for routine use in the detection of colorectal cancer.</p>
Keywords decay-accelerating factor (DAF) colorectal cancer enzyme-linked immunosorbent assay (ELISA). monoclonal sntibodies
Amo Type Article
Published Date 2002-08
Publication Title Acta Medica Okayama
Volume volume56
Issue issue4
Publisher Okayama University Medical School
Start Page 171
End Page 176
ISSN 0386-300X
NCID AA00508441
Content Type Journal Article
language 英語
File Version publisher
Refereed True
PubMed ID 12199521
Web of Science KeyUT 000177382600001