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Umemoto T, Adachi K. New Method for Trifluoromethylation of Enolate Anions and Applications to Regio-, Diastereo- and Enantioselective Trifluoromethylation. J Org Chem 2002. [DOI: 10.1021/jo00098a030] [Citation(s) in RCA: 155] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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Umemoto T, Fukami S, Tomizawa G, Harasawa K, Kawada K, Tomita K. Power- and structure-variable fluorinating agents. The N-fluoropyridinium salt system. J Am Chem Soc 2002. [DOI: 10.1021/ja00179a047] [Citation(s) in RCA: 308] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Hayashi T, Mataga N, Umemoto T, Sakata Y, Misumi S. Solvent-induced polarization phenomena in the excited state of composite systems with identical halves. 2. Effects of solvent polarity upon the fluorescence of [2.2](1,3)pyrenophane. ACTA ACUST UNITED AC 2002. [DOI: 10.1021/j100520a012] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Umemoto T, Ishihara S. Power-variable electrophilic trifluoromethylating agents. S-, Se-, and Te-(trifluoromethyl)dibenzothio-, -seleno-, and -tellurophenium salt system. J Am Chem Soc 2002. [DOI: 10.1021/ja00059a009] [Citation(s) in RCA: 445] [Impact Index Per Article: 20.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Abstract
The motility and chemotaxis of human oral spirochetes Treponema denticola ATCC 35404, T. medium ATCC 700293, and T. vincentii ATCC 35580 were examined by a capillary assay method. Of five sera three human oral treponemes were dominantly chemoattractant to the rabbit serum. The checkerboard analysis of chemotaxis toward rabbit serum clearly showed that the motile T. denticola cells swam toward the culture media containing higher concentrations of the rabbit serum. T. denticola chemotaxis to the rabbit serum was clearly reduced by heating serum, and rabbit albumin contributed by 60 to 70% to its chemotaxis to the rabbit serum. Western blotting analysis demonstrated that these treponemes possessed rabbit albumin-binding polypeptides with approximate molecular sizes of 65 kDa and 70 kDa. Immunoelectron microscopy demonstrated that a 65 kDa rabbit albumin-binding polypeptide was located on the outer envelopes, suggesting that the rabbit albumin-binding polypeptide is responsible for chemotaxis toward rabbit serum.
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Affiliation(s)
- T Umemoto
- Department of Oral Microbiology, Asahi University School of Dentistry, Gifu, Japan.
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Umemoto T, Yano M, Satoh H, Shomura A, Nakamura Y. Mapping of a gene responsible for the difference in amylopectin structure between japonica-type and indica-type rice varieties. Theor Appl Genet 2002; 104:1-8. [PMID: 12579422 DOI: 10.1007/s001220200000] [Citation(s) in RCA: 202] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
The present investigation revealed that the alk and gel(t) genes, which cause the differences between a japonica rice variety Nipponbare and an indica rice variety Kasalath in terms of the disintegration of endosperm starch granules in alkali solution and their gelatinisation in a 4 M urea solution, respectively, cosegregated in backcross inbred lines derived from a cross between the two varieties. The segregation pattern of the profile for amylopectin chain-length, which was distinguished by enrichment in short chains of DP<==11 and depletion in intermediate-size chains of 12<==DP<==24 in japonica as compared with indica, was exactly the same as those of the above physico-chemical properties of starch granules, and the gene was designated as acl(t). Gene-mapping analysis showed that the starch synthase IIa ( SSIIa) gene is located at the alk locus on chromosome 6 in the rice genome. These results lead us to the possibility that different alleles of the SSIIa gene are responsible for differences in amylopectin structure between the two varieties, in that SSIIa plays a distinct role in the elongation of short chains within clusters (A+B(1) chains) of amylopectin. It is proposed that the activity of SSIIa in japonica rice is reduced in amount or functional capacity relative to the activity of this enzyme in indica rice. This, in turn, would explain why starch from japonica rice has a lower gelatinisation temperature than starch from indica rice and is more susceptible to disintegration in alkali or urea. The evidence for this hypothesis is that the alk(t), gel(t), acl(t) and SSIIa genes all map to the same locus.
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Affiliation(s)
- T Umemoto
- Tohoku National Agricultural Experiment Station, Omagari, Akita 014-0102, Japan
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Takahashi Y, Yoshimoto H, Kato D, Hamada N, Arai M, Umemoto T. Reduced fimbria-associated activities of Porphyromonas gingivalis induced by recombinant fimbrial expression. FEMS Microbiol Lett 2001; 195:217-22. [PMID: 11179655 DOI: 10.1111/j.1574-6968.2001.tb10524.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
The adhesion properties of the recombinant fimbriae (r-fimbriae) recovered from a YH522 transformant of Porphyromonas gingivalis which harbors a chimeric plasmid, pYHF2, containing the fimA gene of strain 381 were compared with those of the endogenous fimA fimbriae of strain 33277. The adhesion level of the r-fimbriae to Actinomyces viscosus was clearly lower than that of the endogenous fimbriae. In addition, the r-fimbriae were shown to lack some minor components detectable in the endogenous fimbriae. The plasmid pYHF2 prepared from the YH522 transformant was then transformed into six different P. gingivalis strains and the resultant pYHF2-containing strains were examined for their fimbrial expression. In spite of the presence of a considerable diversity in the expression level of the r-fimbriae among these transformants, it was evident that the strains expressing higher levels of the r-fimbriae exhibited a greater decrease in adhesion activity to other bacteria and to oral epithelial cells, as well as in self-aggregation.
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Affiliation(s)
- Y Takahashi
- Department of Oral Microbiology, Kanagawa Dental College, 82 Inaoka-cho, Yokosuka 238-8580, Japan
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60
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Abstract
We previously reported the existence of two different kinds of fimbriae expressed by Porphyromonas gingivalis ATCC 33277. In this study, we isolated and characterized a secondary fimbrial protein from strain FPG41, a fimA-inactivated mutant of P. gingivalis 381. FPG41 was constructed by a homologous recombination technique using a mobilizable suicide vector, and failed to express the long fimbriae (41-kDa fimbriae) that were produced on the cell surface of P. gingivalis 381. However, short fimbrial structures were observed on the cell surface of FPG41 by electron microscopy. The fimbrial protein was purified from FPG41 by DEAE-Sepharose CL-6B column chromatography. The secondary fimbrial protein was eluted at 0.15 M NaCl, and the molecular mass of this protein was approximately 53 kDa as estimated by SDS-PAGE. An antibody against the 53-kDa fimbrial protein reacted with the short fimbriae of the FPG41 and the wild-type strain. However, the 41-kDa long fimbriae of the wild-type strain and the 67-kDa fimbriae of ATCC 33277 did not react with the same antibody. Moreover, the N-terminal amino acid sequence of the 53-kDa fimbrial protein showed only 2 of 15 residues that were identical to those of the 41-kDa fimbrial protein. These results show that the properties of the 53-kDa fimbriae are different from those of the 67-kDa fimbriae of ATCC 33277 as well as those of the 41-kDa fimbriae.
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Affiliation(s)
- M Arai
- Department of Oral Microbiology, Kanagawa Dental College, 82 Inaoka-cho, 238-8580, Yokosuka, Japan
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61
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Kubo K, Umemoto T, Shirahashi K, Wakabayashi M, Imaizumi M, Furuhashi K, Kitoh Y. [Day surgery for treatment of varicose veins in the leg]. Nihon Geka Gakkai Zasshi 2000; 101:741-4. [PMID: 11107601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
We had surgically treated varicose veins in 554 legs of 386 patients as of June 30, 2000. Varicose veins of the stem or segment type without skin changes were treated with sclerotherapy combined with high ligation, while a part of secondary varicose veins and the reticular or web type were treated with sclerotherapy alone. This paper describes our methods for day surgery for this condition. The most important therapeutic consideration in the surgical procedure is achieving sufficient venous collapse to prevent the occurrence of intravenous thrombus. In our 386 patients, a massive intravenous thrombus that was resected occurred in one limb (0.1%). Postoperative bleeding also occurred in one limb (0.1%) of a patient with severe liver cirrhosis.
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Affiliation(s)
- K Kubo
- Department of Cardiovascular Surgery, National Tohsei Hospital, Shizuoka, Japan
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Tabeta K, Yamazaki K, Akashi S, Miyake K, Kumada H, Umemoto T, Yoshie H. Toll-like receptors confer responsiveness to lipopolysaccharide from Porphyromonas gingivalis in human gingival fibroblasts. Infect Immun 2000; 68:3731-5. [PMID: 10816537 PMCID: PMC97668 DOI: 10.1128/iai.68.6.3731-3735.2000] [Citation(s) in RCA: 114] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Gingival fibroblasts produce proinflammatory cytokines in response to lipopolysaccharide (LPS) from periodontopathic bacteria. Recently it has become evident that the human homologue of Drosophila Toll can transduce intracellular signaling by LPS stimulation. Toll-like receptors (TLRs) have been identified in myeloid cells; however, their role in nonmyeloid cells such as gingival fibroblasts has not been fully elucidated. Here, we report that human gingival fibroblasts constitutively express TLR2 and TLR4 and that their levels of expression are increased by stimulation with LPS from Porphyromonas gingivalis. Upregulated expression of interleukin-6 gene and protein in fibroblasts stimulated with LPS is inhibited by anti-TLR4 antibody. These findings suggest that TLRs may confer responsiveness to LPS in gingival fibroblasts.
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Affiliation(s)
- K Tabeta
- Department of Periodontology, Faculty of Dentistry, Niigata University, Niigata, Japan
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64
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Minabe M, Suzuki F, Umemoto T. Intra-pocket antibiotic therapy using resorbable and non-resorbable slow-release devices containing tetracycline. Periodontal Clin Investig 2000; 22:14-21. [PMID: 11402456] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 04/16/2023]
Abstract
Since it is a disease mainly caused by plaque--an aggregate of various bacteria--periodontal disease can be considered a local infection. Thus, it has seemed reasonable to utilize antibiotics to suppress the intrapocket bacteria, specifically or nonspecifically. When antibiotics are administered orally, however, massive doses over a prolonged period of time are needed to attain a therapeutic effect. This increases the risk of adverse reactions as well as developing resistant strains of bacteria. To overcome these problems, local drug delivery systems (LDDS) were devised to combat the local infection. However, the intrapocket antibiotic delivery systems have yet to be fully evaluated for clinical effectiveness; to prove the therapeutic effectiveness of locally administered antibiotics, the drug must reach the base of the periodontal pocket and the effective concentration of the antibiotic against the pathogenic bacteria must be maintained for a long time. This concise review presents with figures, tables, and a comprehensive list of references the many studies which have used the various tetracyclines as LDDS to treat periodontal disease.
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Affiliation(s)
- M Minabe
- Department of Periodontics, Ohu University, Faculty of Dentistry, Fukushima, Japan
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Kato M, Saji S, Kanematsu M, Fukada D, Miya K, Umemoto T, Kunieda K, Sugiyama Y, Takao H, Kawaguchi Y, Takagi Y, Kondo H, Hoshi H. Detection of lymph-node metastases in patients with gastric carcinoma: comparison of three MR imaging pulse sequences. Abdom Imaging 2000; 25:25-9. [PMID: 10652916 DOI: 10.1007/s002619910004] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
BACKGROUND To compare the diagnostic accuracy of magnetic resonance (MR) images obtained with three different pulse sequences for lymph-node metastases in patients with gastric cancer. METHODS T1-weighted spin-echo (SE), breath-hold T2-weighted fast SE, and triphasic gadolinium-enhanced dynamic gradient-recall-echo (GRE) MR images obtained in 16 patients with gastric carcinoma were retrospectively reviewed. Regional lymph nodes were assigned to four different groups, and image review was conducted on a lymph-node group-by-group basis; 64 lymph-node groups were reviewed by two radiologists. Relative sensitivity, specificity, and accuracy were determined based on the findings with definitive surgery and follow-up imaging. Diagnostic accuracy was determined by means of receiver-operating-characteristic (ROC) analysis. RESULTS Relative sensitivities for lymph-node metastases with T1-weighted SE, breath-hold T2-weighted fast SE, and dynamic GRE images were 61%, 94%, and 59%, respectively. Relative sensitivity with breath-hold T2-weighted fast SE images was significantly greater than that with T1-weighted SE (p < 0.05) and dynamic GRE (p < 0.05) images. Diagnostic accuracy determined by ROC analysis was marginally higher with breath-hold T2-weighted fast SE (area under ROC curve [Az] = 0.87) than with T1-weighted SE (Az = 0.78, p = 0.08) and dynamic GRE (Az = 0.79, p = 0.12) images. CONCLUSION Breath-hold T2-weighted fast SE sequence is useful in the detection of regional lymph-node metastases in patients with gastric carcinoma.
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Affiliation(s)
- M Kato
- Second Department of Surgery, Gifu University School of Medicine, Japan
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Umemoto T, Yoshimura F, Kureshiro H, Hayashi J, Noguchi T, Ogawa T. Fimbria-mediated coaggregation between human oral anaerobes Treponema medium and Porphyromonas gingivalis. Microbiol Immunol 1999; 43:837-45. [PMID: 10553676 DOI: 10.1111/j.1348-0421.1999.tb01218.x] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Bacterial binding phenomena among different bacterial genera or species play an important role in bacterial colonization in a mixed microbiota such as in the human oral cavity. The coaggregation reaction between two gram-negative anaerobes, Treponema medium and Porphyromonas gingivalis, was characterized using fimbria-deficient mutants of P. gingivalis and specific antisera against purified fimbriae and bacterial whole cells. T. medium ATCC 700273 strongly coaggregated with fimbriate P. gingivalis strains ATCC 33277 and 381, but not with afimbriate strains including transposon-induced fimbria-deficient mutants and KDP98 as a fimA-disrupted mutant of P. gingivalis ATCC 33277. In the P. gingivalis-T. medium coaggregation assay, the presence of rabbit antiserum against the purified fimbriae or the whole cells of P. gingivalis ATCC 33277 produced different "aggregates" consisting predominantly of P. gingivalis cells with few spirochetes, but both preimmune serum and the antiserum against the afimbriate KDP98 cells did not inhibit the coaggregation reaction. Heated P. gingivalis cells lost their ability to bind both heated and unheated T. medium cells. This T. medium-P. gingivalis coaggregation reaction was inhibited by a cysteine proteinase inhibitor, leupeptin, and also by arginine and lysine, but not by EDTA or sugars including lactose. A binding assay on nitrocellulose membranes and immunoelectron microscopy demonstrated that a heat-stable 37 kDa surface protein on the T. medium cell attached to the P. gingivalis fimbriae.
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Affiliation(s)
- T Umemoto
- Department of Oral Microbiology, School of Dentistry, Asahi University, Gifu, Japan.
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Yoshitomi Y, Kojima S, Umemoto T, Hosoi Y, Kuramochi M. A retrospective study of late outcome in patients with peripheral arterial occlusive disease: an association between prosthetic vascular graft and cancer death? Angiology 1999; 50:1007-15. [PMID: 10609767 DOI: 10.1177/000331979905001206] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The authors assessed the relationship between cause of death and treatment modality in patients with peripheral arterial occlusive disease. A total of 273 patients were treated with percutaneous transluminal angioplasty, surgical reconstruction, amputation, or medical therapy. We evaluated the outcome in various patient subgroups divided by treatments with a mean follow-up of 4.9 years. Most patients died because of cardiovascular or cerebrovascular events, and cancer was the second most frequent cause of death. Furthermore, there was a significant difference in cancer deaths between patients who received prosthetic vascular grafts and those with other types of treatment (9.3% vs. 2.8%, p<0.01, odds ratio = 3.34). It is noteworthy that patients with peripheral arterial occlusive disease succumbed to cancer, especially the patients with prosthetic vascular grafts.
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Affiliation(s)
- Y Yoshitomi
- Division of Cardiology, Tohsei National Hospital, Suntoh-gun, Shizuoka, Japan.
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68
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Umemoto T, Mikami H, Yamamoto S, Hirano N. The Ortho-to-Para Ratio of Ammonia in the L1157 Outflow. Astrophys J 1999; 525:L105-L108. [PMID: 10525465 DOI: 10.1086/312337] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
We have measured the ortho-to-para ratio of ammonia in the blueshifted gas of the L1157 outflow by observing the six metastable inversion lines from &parl0;J,K&parr0;=&parl0;1,1&parr0; to (6, 6). The highly excited (5, 5) and (6, 6) lines were first detected in the low-mass star-forming regions. The rotational temperature derived from the ratio of four transition lines from (3, 3) to (6, 6) is 130-140 K, suggesting that the blueshifted gas is heated by a factor of approximately 10 as compared to the quiescent gas. The ortho-to-para ratio of the NH3 molecules in the blueshifted gas is estimated to be 1.3-1.7, which is higher than the statistical equilibrium value. This ratio provides us with evidence that the NH3 molecules have been evaporated from dust grains with the formation temperature between 18 and 25 K. It is most likely that the NH3 molecules on dust grains have been released into the gas phase through the passage of strong shock waves produced by the outflow. Such a scenario is supported by the fact that the ammonia abundance in the blueshifted gas is enhanced by a factor of approximately 5 with respect to the dense quiescent gas.
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Abstract
Bone resorption is regulated by the cytokines within marrow cells that mediate osteoclast formation and activation. IL-1 and TNF induce bone resorption by stimulating the production of osteoclast-like multinucleated cells and by increasing the bone-resorbing activity of formed osteoclasts. This study was designed to detect IL-1 and TNF in osteoclasts in vitro and to determine whether these cytokines up-regulate osteoclast differentiation and bone resorption. The production of IL-1 alpha, -beta, and TNF alpha, beta in osteoclasts was examined immunohistochemically and by in situ hybridization. In the co-culture of C57BL/6N mouse bone marrow and MC3T3-G2/PA6 cells, a colony of osteoclasts formed, and IL-1 alpha and TNF alpha were detected. However, IL-1 beta and TNF beta were not detected. To investigate the role of IL-1 alpha and TNF alpha from osteoclasts, we enumerated TRAP-positive cells and measured the resorption pit areas in the presence of antibodies against IL-1 alpha and TNF alpha. The addition of antibodies against IL-1 alpha and TNF alpha to the co-culture system decreased the number of TRAP-positive colonies at seven days after incubation (anti-IL-1 alpha, 25.0 +/- 2.3%; anti-TNF alpha, 41.7 +/- 3.7%; anti-IL-1 alpha + anti-TNF alpha, 40.5 +/- 1.3%; and control, 100%), and the ratio of mononuclear to multinuclear cells had changed (anti-IL-1 alpha, 90:10; anti-TNF alpha, 75:25; anti-IL-1 alpha+ anti-TNF alpha, 88:12; and control, 60:40). The total pit areas per dentin slice also decreased with the addition of antibodies (anti-IL-1 alpha, 28,828; anti-TNF alpha, 49,249; anti-IL-1 alpha + anti-TNF alpha, 30,685; and control, 303,139 mm2). These results suggest that local production of IL-1 alpha and TNF alpha by osteoclasts is an important mechanism for regulating the osteoclast differentiation and bone resorptive process.
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Affiliation(s)
- N Tani-Ishii
- Department of Operative Dentistry and Endodontics, Kanagawa Dental College, Yokosuka, Japan
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Miya K, Saji S, Fukada D, Umemoto T, Kunieda K, Sugiyama Y, Takao H, Kato M, Kawaguchi Y. [Clinical evaluation of intermittent hepatic arterial infusion therapy with CDDP and 5-FU for liver metastasis of colorectal cancer]. Gan To Kagaku Ryoho 1999; 26:1715-7. [PMID: 10560378] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
Twenty-seven patients with liver metastasis from colorectal cancer were treated with intermittent intra-arterial infusion chemotherapy for 5 years starting from 1993. Five to ten mg of CDDP, 250 mg of 5-FU and/or 3-6 mg of Leucovorin were administered weekly. In the case of nonresponders, the dose of 5-FU was allowed to increase toward 500 mg. The above schedule was repeated as long as possible. The average number of administrations in 12 out of 27 unresectable patients was 28.7. The response rate was 50% (CR; 4 cases, PR; 2), with 2 NC and 3 PD. Four patients given 500 mg of 5-FU showed some response. The 50% survival period was 466 days, and the 1- and 3-year survival rates were 66.7% and 18.3%, respectively. The average number of administrations in the group of patients who underwent prophylactic treatment and resection of the metastasis was 33.1. During an average observational period 681 days, 7 patients (46.7%) had a recurrence in the liver. The 5-year survival rate was 85.7%. The patients who were treated with 250 mg 5-FU experienced no severe side effects, but one who was given 500 mg 5-FU developed a duodenal ulcer.
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Affiliation(s)
- K Miya
- Second Dept. of Surgery, Gifu University School of Medicine
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71
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Yoshitomi Y, Kojima S, Umemoto T, Kubo K, Matsumoto Y, Yano M, Sugi T, Kuramochi M. Serum hepatocyte growth factor in patients with peripheral arterial occlusive disease. J Clin Endocrinol Metab 1999; 84:2425-8. [PMID: 10404815 DOI: 10.1210/jcem.84.7.5826] [Citation(s) in RCA: 21] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Hepatocyte growth factor (HGF) is a multifunctional protein implicated in tissue regeneration, wound healing, and angiogenesis. We measured serum HGF concentrations in 37 patients with peripheral arterial occlusive disease (PAOD). Among them, 36 patients underwent arteriography. Serum HGF concentrations were also measured in 40 control subjects who remained free of vascular, liver, kidney, or lung disease. Patients with PAOD showed elevated serum HGF concentrations compared with control subjects (0.40+/-0.02 vs. 0.19+/-0.01 ng/mL; P<0.001). Serum HGF concentrations were significantly higher in smokers compared with nonsmokers (0.45+/-0.03 vs. 0.35+/-0.02 ng/mL; P = 0.003). The serum HGF concentrations in patients with collaterals tended to be higher than those in patients without collaterals (0.43+/-0.03 vs. 0.35+/-0.02 ng/mL; P = 0.06). Moreover, in patients who underwent bypass surgery or angioplasty, serum HGF concentrations decreased from 0.41+/-0.03 to 0.21+/-0.04 ng/mL after treatment (P<0.001). Serum HGF may be an useful marker for the diagnosis of PAOD. HGF may play an important role in angiogenesis and collateral vessel growth in PAOD.
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Affiliation(s)
- Y Yoshitomi
- Division of Cardiology, Tohsei National Hospital, Shizuoka, Japan.
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72
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Saji S, Sugiyama Y, Kunieda K, Umemoto T. [Recent progress in biological therapies for cancer]. Gan To Kagaku Ryoho 1999; 26 Suppl 1:32-41. [PMID: 10410657] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
After approval of national health insurance for non-specific immunomodulation such as OK-432 (1978) and PSK (1980), lentinan, SPG, bestatin and dried BCG vaccine have been tried. Including cytokines such as IL-2, IL-12, IFN, TNF or monoclonal antibodies, they have been widely used as biological response modifiers (BRM). Progress in BRM therapy may be broken down into the first 10 years as development, the next 10 years as disappointment and the most recent 5 years as dream-like progress owing to molecular biological techniques. An interdisciplinary approach has been taken by the Japanese Research Society for Surgical Cancer Immunology, founded in 1980, and the Japanese Society of BRM founded in 1988. Many investigations have been performed on issues such as the clinical evaluation or criteria for responder cases, host immunocompetency, post-operative adjuvant immuno-chemotherapy, locoregional immunotherapy, cytokine therapy, adoptive immunotherapy, and tumor specific immunotherapy. Attention has also focused on malignant tumor injury, surgical stress, the advantages or disadvantages of splenectomy, and discussions of the current status and future prospects in the next century for new BRM therapy.
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Affiliation(s)
- S Saji
- Second Dept. of Surgery, Gifu University School of Medicine
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73
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Li M, Liu Z, Umemoto T. [Collagen-binding proteins of human oral spirochetes]. Zhonghua Kou Qiang Yi Xue Za Zhi 1999; 34:165-7. [PMID: 11776931] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
OBJECTIVE To evaluate pathogenic effect of the collagen-binding proteins(CBP) of human oral spirochetes. METHODS Immunoblot analysis, immunoelectron microscopy and other experiments had been used. RESULTS It was showed that: type I, IV and V CBP were detected in heated and unheated preparations from Treponema denticola(Td) ATCC 33520 and Treponema socranskii (Ts) ATCC 35534. Few CBP, however, were detected in heated and unheated preparations from a recently characterized isloate, Treponema medium(Tm) strain G7201. 27,000 type V CBP of Td, 110,000 type I of Ts and 95,000 type IV of Tm were located on the envelopes of the individual cells. The adherence of Td to the collagen-coated surface was significantly greater than that of Tm. CONCLUSION The CBP on the oral spirochetal cells play an important role in their adherence to collagen-rich connective tissues of the host.
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Affiliation(s)
- M Li
- Research Institute of Stomatology, Shanghai Second Medical University, Shanghai 200011
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Abstract
The Porphyromonas gingivalis fimbria is an important virulence factor involved in the adherence and colonization of the organism in the oral cavity. In this study, we transformed this organism with a gene, fimA381, encoding the fimbrial subunit of P. gingivalis 381 (fimbrillin) by using the host-vector system that we developed previously and examined expression of the cloned fimA381 gene. The recombinant plasmid pYHF2 was constructed by ligating a fragment containing the fimA381 gene into the plasmid vector pYH420 and transformed into the restriction-deficient P. gingivalis host YH522. pYHF2 was autonomously maintained in YH522 cells, and the fimbrillin polypeptide (recombinant fimbrillin) was fully expressed. The molecular mass of the recombinant fimbrillin was evaluated by sodium dodecyl sulfate-polyacrylamide gel electrophoresis as 41 kDa, which was identical to that of the native fimbrillin of strain 381. The amino acid sequences of the 20 amino-terminal residues of the recombinant fimbrillin and the native fimbrillin of the strain 381 were identical. In addition, characteristic long and thin fimbrial structures (recombinant fimbriae) that were distinguishable from the host's native fimbriae when examined by immunogold electron microscopy were observed around the cell surface of the transformants containing the fimA381 gene. These results suggested that transformation of fimA gene from a different strain of P. gingivalis followed by accumulation of the mature fimbrial subunit protein was sufficient for production of fimbrial structures that were observable by electron microscopy.
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Affiliation(s)
- Y Takahashi
- Department of Oral Microbiology, Kanagawa Dental College, Yokosuka 238-8580, Japan
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75
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Ushiki T, Hitomi J, Umemoto T, Yamamoto S, Kanazawa H, Shigeno M. Imaging of living cultured cells of an epithelial nature by atomic force microscopy. Arch Histol Cytol 1999; 62:47-55. [PMID: 10223742 DOI: 10.1679/aohc.62.47] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
The present paper describes the applicability of atomic force microscopy (AFM) to the observation of living cultured cells of an epithelial nature (human esophageal squamous cell carcinoma cells, or C7 subclone of KESC2 cells) in a culture medium. For this purpose, we made a fluid chamber system which allows a constant-speed perfusion of fluid at a regulated temperature in the chamber. Using this system, AFM images of living cells were successfully obtained for over one hour at time intervals of 2-4 min during continuous perfusion of the fresh culture medium. A series of these AFM images proved useful for examining the movements of cellular processes in relation to subcellular cytoskeletal elements. Time-lapse movie records produced by sequential AFM images further verify the reality of the cellular dynamics.
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Affiliation(s)
- T Ushiki
- Department of Anatomy, Niigata University School of Medicine, Japan.
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76
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Abstract
A 54-year-old woman came to our office because of pretibial edema. She had no gastrointestinal symptoms. Laboratory tests revealed severe hypoproteinemia. Upper gastrointestinal endoscopy demonstrated enlarged gastric folds and multiple aphthoid nodules on the body and the fornix of the stomach. The biopsy specimen revealed a large number of CD8 positive intraepithelial T-lymphocytes infiltrating the gastric mucosa. Both serum total protein and the gastric lesions improved eight months after her first visit without any therapy for peptic ulcer or eradication of Helicobacter pylori. The data suggest that spontaneous remission may occur in lymphocytic gastritis without any gastrointestinal symptoms.
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Affiliation(s)
- M Amenomori
- Ryuo Medical Center Yuge Clinic, Gamogun, Shiga
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77
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78
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Zeeman SC, Umemoto T, Lue WL, Au-Yeung P, Martin C, Smith AM, Chen J. A mutant of Arabidopsis lacking a chloroplastic isoamylase accumulates both starch and phytoglycogen. Plant Cell 1998; 10:1699-712. [PMID: 9761796 PMCID: PMC144351 DOI: 10.1105/tpc.10.10.1699] [Citation(s) in RCA: 103] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
In this study, our goal was to evaluate the role of starch debranching enzymes in the determination of the structure of amylopectin. We screened mutant populations of Arabidopsis for plants with alterations in the structure of leaf starch by using iodine staining. The leaves of two mutant lines stained reddish brown, whereas wild-type leaves stained brownish black, indicating that a more highly branched polyglucan than amylopectin was present. The mutants were allelic, and the mutation mapped to position 18.8 on chromosome 1. One mutant line lacked the transcript for a gene with sequence similarity to higher plant debranching enzymes, and both mutants lacked a chloroplastic starch-hydrolyzing enzyme. This enzyme was identified as a debranching enzyme of the isoamylase type. The loss of this isoamylase resulted in a 90% reduction in the accumulation of starch in this mutant line when compared with the wild type and in the accumulation of the highly branched water-soluble polysaccharide phytoglycogen. Both normal starch and phytoglycogen accumulated simultaneously in the same chloroplasts in the mutant lines, suggesting that isoamylase has an indirect rather than a direct role in determining amylopectin structure.
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Affiliation(s)
- S C Zeeman
- John Innes Centre, Colney Lane, Norwich NR4 7UH, United Kingdom.
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79
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Hirabayashi H, Hirosawa H, Kobayashi H, Murata Y, Edwards PG, Fomalont EB, Fujisawa K, Ichikawa T, Kii T, Lovell JEJ, Moellenbrock GA, Okayasu R, Inoue M, Kawaguchi N, Kameno S, Shibata KM, Asaki Y, Bushimata T, Enome S, Horiuchi S, Miyaji T, Umemoto T, Migenes V, Wajima K, Nakajima J, Morimoto M, Ellis J, Meier DL, Murphy DW, Preston RA, Smith JG, Tingay SJ, Traub DL, Wietfeldt RD, Benson JM, Claussen MJ, Flatters C, Romney JD, Ulvestad JS, D’Addario LR, Langston GI, Minter AH, Carlson BR, Dewdney PE, Jauncey DL, Reynold JE, Taylor AR, McCulloch PM, Cannon WH, Gurvits LI, Mioduszewski AJ, Schilizzi RT, Booth RS. Overview and initial results of the very long baseline interferometry space observatory programme. Science 1998; 281:1825-9. [PMID: 9743489 DOI: 10.1126/science.281.5384.1825] [Citation(s) in RCA: 127] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
High angular resolution images of extragalactic radio sources are being made with the Highly Advanced Laboratory for Communications and Astronomy (HALCA) satellite and ground-based radio telescopes as part of the Very Long Baseline Interferometry (VLBI) Space Observatory Programme (VSOP). VSOP observations at 1.6 and 5 gigahertz of the milli-arc-second-scale structure of radio quasars enable the quasar core size and the corresponding brightness temperature to be determined, and they enable the motions of jet components that are close to the core to be studied. Here, VSOP images of the gamma-ray source 1156+295, the quasar 1548+056, the ultraluminous quasar 0014+813, and the superluminal quasar 0212+735 are presented and discussed.
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Affiliation(s)
- H Hirabayashi
- H. Hirabayashi, H. Hirosawa, H. Kobayashi, Y. Murata, P. G. Edwards, E. B. Fomalont, K. Fujisawa, T. Ichikawa, T. Kii, J. E. J. Lovell, G. A. Moellenbrock, and R. Okayasu are with the Institute of Space and Astronautical Science, Sagamihara, Kanagawa 22
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80
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Hakata Y, Umemoto T, Matsushita S, Shida H. Involvement of human CRM1 (exportin 1) in the export and multimerization of the Rex protein of human T-cell leukemia virus type 1. J Virol 1998; 72:6602-7. [PMID: 9658105 PMCID: PMC109841 DOI: 10.1128/jvi.72.8.6602-6607.1998] [Citation(s) in RCA: 56] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/1998] [Accepted: 05/05/1998] [Indexed: 02/08/2023] Open
Abstract
We investigated the role of human CRM1 (hCRM1) (exportin 1) in the function of Rex protein encoded by human T-cell leukemia virus type 1. hCRM1 promoted the export of Rex protein from the nucleus to the cytoplasm. A Rex protein with a mutation in the activation domain, RexM90, lost both the ability to bind to hCRM1 and the ability to multimerize. The overexpression of hCRM1 complemented the functional defects of RexM64, which contains a mutation in the multimerization domain of Rex. A dominant-negative mutant of Rex which sequesters cofactors of Rex abrogated multimerization as well as the activity of the wild-type Rex protein. These two functions were simultaneously restored by the overexpression of hCRM1. Taken together, these results suggest that hCRM1 plays important roles in the multimerization and export of Rex protein.
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Affiliation(s)
- Y Hakata
- Institute for Virus Research, Kyoto University, Kyoto 606, Japan
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81
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Miya K, Adachi T, Nagao N, Takagi Y, Kawaguchi Y, Kato M, Takao H, Sugiyama Y, Kunieda K, Umemoto T, Fukada D, Saji S. [Clinical evaluation of intermittent hepatic arterial infusion therapy for metastatic liver tumor of gastric and colorectal cancer]. Gan To Kagaku Ryoho 1998; 25:1397-401. [PMID: 9703838] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
Eleven patients with liver metastasis from gastric cancer were treated by intermittent arterial infusion using OK-432 and recombinant IL-2 in combination with anticancer drugs. The direct effects for liver metastasis were PR 3 (response rate 30%), MR 2, NC 3, PD 1 and NE 1. Papillary adenocarcinoma showed a highly effective rate. The mean survival period was 326 days and the 50% survival period was 318 days. Out of 4 patients who underwent surgical resection for metastatic liver tumor, one showed recurrence, and the other is now healthy without any sign of recurrence for 8 years after the operation. In 7 patients with liver metastasis from colorectal cancer, intermittent arterial infusion therapy using Leucovorin, CDDP and 5-FU was performed. The direct effects were CR 2, PR 1, MR 1, PD 2, NE 1; the mean survival period was 478 days, and the 50% survival period 556 days. Out of 8 patients who underwent liver resection for metastasis, all patients remained alive for 687 mean survival days without liver recurrence. No severe side effects were noted in either therapy.
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Affiliation(s)
- K Miya
- 2nd Dept. of Surgery, Gifu University School of Medicine
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82
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Umemoto T, Hoshi H, Tsuda M, Horio S, Itou N, Neriki T. Local health care system utilizing the LPG (liquid propane gas) network. Jpn Hosp 1998; 17:33-5. [PMID: 10187296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/11/2023]
Abstract
JAC's LPG monitoring network system is mainly provided in mountain villages. However, by using this system, it will be possible to start a Digital Network Program for the Elderly while maintaining superior economic feasibility and public benefit using existing information infrastructures. This project also has the capabilities for the creation of a fire/disaster monitoring system, as well as a health care system by using conventional LPG monitoring systems. Telemedicine is an option for the future, as well, by connecting medical equipment and a tele-conferencing system.
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Affiliation(s)
- T Umemoto
- Division of Medical Informatics, Gifu University Hospital, Gifu City, Japan
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83
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Umemoto T, Nagayoshi M, Adachi K, Tomizawa G. Synthesis, Properties, and Reactivity of N,N‘-Difluorobipyridinium and Related Salts and Their Applications as Reactive and Easy-To-Handle Electrophilic Fluorinating Agents with High Effective Fluorine Content1. J Org Chem 1998. [DOI: 10.1021/jo972338q] [Citation(s) in RCA: 84] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Teruo Umemoto
- MEC Laboratory, Daikin Industries, Ltd., Miyukigaoka 3, Tsukuba, Ibaraki 305-0841, Japan
| | - Masayuki Nagayoshi
- MEC Laboratory, Daikin Industries, Ltd., Miyukigaoka 3, Tsukuba, Ibaraki 305-0841, Japan
| | - Kenji Adachi
- MEC Laboratory, Daikin Industries, Ltd., Miyukigaoka 3, Tsukuba, Ibaraki 305-0841, Japan
| | - Ginjiro Tomizawa
- MEC Laboratory, Daikin Industries, Ltd., Miyukigaoka 3, Tsukuba, Ibaraki 305-0841, Japan
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84
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Umemoto T. [The front line of the study on human oral spirochetes]. Nihon Saikingaku Zasshi 1998; 53:425-33. [PMID: 9654942 DOI: 10.3412/jsb.53.425] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- T Umemoto
- Department of Oral Microbiology, School of Dentistry, Asahi University, Gifu
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85
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Kato M, Saji S, Kanematsu M, Fukada D, Miya K, Umemoto T, Kunieda K, Sugiyama Y, Takao H, Kawai M, Kawaguchi Y. Evaluation of angiographically assisted spiral CT in surgical cases of hepatocellular carcinoma considering recurrent cases. Int Surg 1998; 83:141-5. [PMID: 9851332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023] Open
Abstract
Between June 1993 and July 1996, computed tomography during arterial portgraphy (CTAP) was performed on 22 patients with hepatocellular carcinoma (HCC) and liver cirrhosis before surgery. In 17 out of 22 patients, CT hepatic arteriography (CTA) was combined with CTAP. All 22 patients underwent definitive surgery. In 16 patients in which CTA was successfully performed, 20 HCC nodules and 28 pseudolesions were detected. The pseudolesions were depicted larger in size with CTA than with CTAP, formed a variety of shapes, and were enhanced homogeneously, while HCC nodules were depicted larger with CTAP than with CTA, formed a round or wedge shape, and were sometimes enhanced heterogeneously. Recurrence was diagnosed in 9 of 22 patients. Five recurrent lesions in 4 patients were already revealed by pre-operative CTAP. CTA was performed in only 1 of 5 lesions. The diagnostic accuracy for HCC significantly improves by recognizing by recognizing pseudolesions with CTA and CTAP.
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Affiliation(s)
- M Kato
- Second Department of Surgery, Gifu University School of Medicine, Japan
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86
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Abstract
The ability of spirochetes to adhere to collagens was compared among three species of human oral treponemes. Immunoblot analysis demonstrated that type I-, IV-, and V-collagen-binding polypeptides (CBPs) were detected in the heated and unheated preparations from both Treponema denticola ATCC 33520 and T. socranskii subsp. buccale ATCC 35534. Few CBPs, however, were detected in the heated and unheated preparations from a recently characterized isolate, T. medium strain G7201. Immunoelectron microscopy using rabbit antisera against the CBPs from the unheated preparations demonstrated that four CBPs, a 27 kDa type V-CBP of T. denticola ATCC 33520, a 95 kDa type IV-CBP and a 110 kDa type I-CBP of T. socranskii subsp. buccale ATCC 35534, and a 95 kDa type IV-CBP of T. medium strain G7201, were located on the outer envelopes of the individual cells. The adherence of T. denticola to the collagen-coated surfaces was significantly greater than that of T. medium, suggesting that the CBPs on the oral spirochetal cells play an important role in their adherence to collagen-rich connective tissues of the host.
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Affiliation(s)
- T Umemoto
- Department of Oral Microbiology, School of Dentistry, Asahi University, Gifu, Japan.
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87
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Abstract
Osteopontin (OPN) is an acidic phosphoprotein synthesized by osteoblasts and osteoclastic cells that are localized in the mineralized phase of bone matrix. OPN is thought to bind to the vitronection receptor on the osteoclast membrane and regulates bone resorption by the osteoclast. In this study, we investigated whether or not OPN can relate to osteoclast differentiation and bone resorption in a co-culture system. When C57Black/6N mouse bone marrow cells suspended on ivory slices coated with collagen were inoculated onto a MC3T3-G2/PA6 cell layer, colonies containing TRAP(+) mononuclear and multinuclear cells were formed in the presence of 1 alpha, 25-dihydroxyvitamin D3 and dexamethasone. At the end of culture period the number of TRAP(+) osteoclast-like cells were counted and the resorption pits were evaluated by reflected light microscopy. The mRNA of OPN was detected by in situ hybridization. Osteoclast-like cells expressed OPN mRNA. The addition of an OPN antisense oligomer (5' AAT CAC TGC CAA TCT CAT 3') at the start of the co-culture period decreased the number of TRAP(+) cells present after 7 d (30.3 +/- 3.4 vs 56.9 +/- 12.4), and the ratio of mononuclear and multinucleated cells was changed (77.6:23.2 vs 60.8:39.3). The total area of pits per ivory slice was also decreased by adding the OPN antisense oligomer (246813 vs 303139 microns2). These results showed that OPN can be an important mechanism for regulating differentiation and bone resorption.
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Affiliation(s)
- N Tani-Ishii
- Department of Endodontics, Kanagawa Dental College, Japan
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88
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Abstract
A host-vector system for transformation of Porphyromonas gingivalis was constructed using a set (1) strains that can incorporate plasmid DNA by electroporation regardless of its source and (2) stable vector plasmids with a selectable marker. First, restriction-negative mutants were isolated, because P. gingivalis possesses restriction modification systems by which DNA introduced by transformation even from heterologous strains of the same species is excluded. For screening of the mutants, plasmid pE5-2 was employed since it could be transconjugated (mobilized) to P. gingivalis from Escherichia coli and is able to replicate in this species, albeit not stably. pE5-2 DNA prepared from E coli was introduced by electroporation into chemically mutagenized P. gingivalis cells. By this method, three putative restriction-negative clones were selected. These strains exhibited a capacity for electroporation with plasmid DNAs both from E. coli and from various P. gingivalis strains at a similar efficiency. Using one of the derivatives thus obtained, YH522, we then screened for plasmids that could replicate stably in P. gingivalis. Since no plasmids were found from P. gingivalis, cryptic plasmids from other species of black-pigmented oral anaerobic rods were examined for their ability to transform P. gingivalis. A series of plasmids constructed by ligation with pBR322 for replication in E. coli and the EcoRI-B fragment from pBF4 containing erythromycin resistance were prepared from E. coli and were used for electroporation of P. gingivalis. Among these, a recombinant plasmid containing the replicon of pYHBA1 from Porphyromonas asaccharolytica, designated pYH400, was found to be incorporated into the restriction-negative P. gingivalis strain and replicated stably. This set of recipient strains and stable plasmids with a selectable marker constitutes the first practical host-vector system for this species.
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Affiliation(s)
- H Yoshimoto
- Department of Oral Microbiology, Kanagawa Dental College, Yokosuka, Japan.
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89
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Affiliation(s)
- Y Ozeki
- Department of Surgery, National Tosei Hospital, Shizuoka-ken, Japan
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90
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Kato M, Saji S, Kanematsu M, Fukada D, Miya K, Umemoto T, Kunieda K, Sugiyama Y, Kuwahara I, Shimokawa K. A case of liver metastasis from colon cancer masquerading as focal sparing in a fatty liver. Jpn J Clin Oncol 1997; 27:189-92. [PMID: 9255276 DOI: 10.1093/jjco/27.3.189] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023] Open
Abstract
Focal sparing in diffusely fatty liver is a well recognized entity. However, it occasionally creates some problems in the diagnosis of hepatic mass lesions. We recently experienced a case of liver metastasis from colon cancer which appeared as a wedge-shaped hyperdense area on non-enhanced CT (computed tomography). Other imaging techniques also demonstrated a wedge-shaped area which was difficult to distinguish from mere focal sparing in the fatty liver. CT arteriography and dynamic magnetic resonance images were useful for diagnosing this metastatic tumor. CT during arterial portography showed a wedge-shaped ischemic area in the anterior segment caused by intrahepatic portal vein blockade. The histological findings eventually revealed that the tumor, an adenocarcinoma, was surrounded by fibrotic tissue that mimicked focal sparing. We present the radiological features of this case and discuss how to arrive at a correct diagnosis.
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Affiliation(s)
- M Kato
- Second Department of Surgery, Gifu University School of Medicine, Japan
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91
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Kumada H, Watanabe K, Nakamu A, Haishima Y, Kondo S, Hisatsune K, Umemoto T. Chemical and biological properties of lipopolysaccharide from Selenomonas sputigena ATCC 33150. Oral Microbiol Immunol 1997; 12:162-7. [PMID: 9467402 DOI: 10.1111/j.1399-302x.1997.tb00373.x] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Chemical and biological studies were performed on lipopolysaccharide isolated from Selenomonas sputigena ATCC 33150T, a possible causative agent of periodontal diseases. The sugar components of the lipopolysaccharide of S. sputigena were mannose, galactose, glucose, L-glycero-D-mannoheptose (heptose), 2-keto-3-deoxy-octonic acid, glucosamine and galactosamine in a molar ratio of 0.3:1.0:1.0:1.0:0.2:3.0:3.2 (mol/mol heptose). Sephadex G-50 chromatography of the polysaccharide portion of the lipopolysaccharide obtained by partial hydrolysis yielded three fractions: the O-polysaccharide chain attached to the core oligosaccharide, the core oligosaccharide and monosaccharides. Compositional analysis of these fractions revealed that lipopolysaccharide of S. sputigena carries a short O-polysaccharide chain consisting of galactose and glucosamine and that the core oligosaccharide consisted of glucose, heptose, glucosamine and 2-keto-3-deoxyoctonic acid. It is of particular interest that galactosamine was detected as a component sugar of the lipid A moiety in addition to glucosamine, which is a usual component sugar of the lipid A of most gram-negative bacteria. Thus, the lipid A of S. sputigena might have a unique backbone that differs from that of the lipid A of other gram-negative bacteria. Lipid A of S. sputigena consisted mainly of fatty acids such as undecanoic, tridecanoic, tridecenoic, 3-hydroxytridecanoic and 3-hydroxytetradecanoic acid in a molar ratio of 0.4:1.0:0.3:4.0:0.5 (mol/mol tridecanoic acid). Lipopolysaccharide and lipid A from S. sputigena both exhibited biological activity in activating the clotting enzyme of Limulus amebocytes, the Schwartzman reaction, mitogenicity for murine lymphocytes and in inducing interleukin-1 alpha and interleukin-6 production in murine macrophages to the same extent as those observed for lipopolysaccharide of the Salmonella serovar typhimurium used as a positive control. The results suggested that the lipopolysaccharide of S. sputigena is a virulent factor in human periodontal diseases.
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Affiliation(s)
- H Kumada
- Department of Oral Microbiology, Kanagawa Dental College, Japan
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92
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Nakazawa F, Umemoto T, Namikawa I, Hoshino E. Genetic characterization of an oral treponeme isolated from human subgingival plaque. Oral Microbiol Immunol 1997; 12:189-92. [PMID: 9467407 DOI: 10.1111/j.1399-302x.1997.tb00378.x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We examined the genetic characteristics of a human oral treponeme isolated from subgingival plaque of a patient with periodontal disease that could not be assigned to any of the previously described oral Treponema species. The guanine-plus-cytosine content of its DNA was 51 mole%. The levels of DNA-DNA relatedness of the organism to other Treponema species, including Treponema denticola, Treponema vincentii, Treponema socranskii, Treponema pallidum and Treponema phagedenis, were less than 30%. This study clearly demonstrated that the isolated treponeme could be completely distinct from the established oral Treponema species genetically. Also, the study indicated remarkable genetic heterogeneity among human oral Treponema species.
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Affiliation(s)
- F Nakazawa
- Department of Oral Microbiology, School of Dentistry, Niigata University, Japan
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93
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Tanamoto K, Azumi S, Haishima Y, Kumada H, Umemoto T. The lipid A moiety of Porphyromonas gingivalis lipopolysaccharide specifically mediates the activation of C3H/HeJ mice. The Journal of Immunology 1997. [DOI: 10.4049/jimmunol.158.9.4430] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Abstract
The lipid A preparation isolated from Porphyromonas gingivalis was found to induce splenocyte mitogenicity and TNF-alpha release from peritoneal macrophages in LPS-unresponsive C3H/HeJ mice to the same extent as in LPS-responsive mice. In order to clarify whether the activation of C3H/HeJ mice was specifically caused by the lipid A and not by contaminating protein, two strategies were employed. The lipid A fraction from P. gingivalis was subjected to either hydrochloric acid or alkaline treatment to eliminate either glycosylated phosphate or O-acylated fatty acids from the lipid A structure, and the biologic activities of the derivatives were compared in both LPS-responsive and unresponsive C3H/HeJ mice. De-1-O-phosphorylated P. gingivalis lipid A showed partial loss, and de-O-acylated lipid A complete loss of splenocyte mitogenic and TNF-alpha-inductive activities from peritoneal macrophages in both LPS-responsive and unresponsive mice. The relative activities of the intact and treated lipid A compounds in splenocyte mitogenicity and TNF-alpha-inductive activity in macrophages were similar to the relative activities of these preparations in Limulus gelation activities. The LPS-specific antagonist, succinylated lipid A precursor, inhibited P. gingivalis lipid A-mediated splenocyte mitogenicity and TNF-alpha induction in macrophages in a similar manner in LPS-responsive and unresponsive mice. These results strongly suggest that the activation of LPS-unresponsive C3H/HeJ mice by P. gingivalis lipid A was specifically mediated by the lipid A portion and not by contaminating protein. The characteristic action of P. gingivalis lipid A on LPS-unresponsive C3H/HeJ mice was thought to reflect the unique chemical properties of this compound.
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Affiliation(s)
- K Tanamoto
- Division of Microbiology, National Institute of Health Sciences, Setagaya-ku, Tokyo, Japan
| | - S Azumi
- Division of Microbiology, National Institute of Health Sciences, Setagaya-ku, Tokyo, Japan
| | - Y Haishima
- Division of Microbiology, National Institute of Health Sciences, Setagaya-ku, Tokyo, Japan
| | - H Kumada
- Division of Microbiology, National Institute of Health Sciences, Setagaya-ku, Tokyo, Japan
| | - T Umemoto
- Division of Microbiology, National Institute of Health Sciences, Setagaya-ku, Tokyo, Japan
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Kiyokawa T, Umemoto T, Watanabe Y, Matsushita S, Shida H. Two distinct pathways for intronless mRNA expression: one related, the other unrelated to human immunodeficiency virus Rev and human T cell leukemia virus type I Rex functions. Biol Signals 1997; 6:134-42. [PMID: 9285096 DOI: 10.1159/000109119] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Intronless mRNAs were classified into two classes based on the sensitivities of their expression to the inhibitory effect of TAgRex, a dominant-negative mutant of the Rex protein of human T cell leukemia virus type I, and their abilities to express the genes encoded in the intron of the human immunodeficiency virus (HIV) genome. Interferon-alpha mRNA could not induce the expression of the env gene of HIV, and its expression was resistant to TAgRex. In contrast, the posttranscriptional regulatory element (PRE), necessary for the nucleo-cytoplasmic export of mRNAs of hepatitis B virus, induced expression of the chloramphenicol acetyl transferase gene located within the intron of the HIV genome. PRE-mediated expression was inhibited by TAgRex. Thus, these results suggest that there are at least two distinct pathways for intronless mRNA expression, one related to and the other unrelated to Rev and Rex functions.
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Affiliation(s)
- T Kiyokawa
- Institute for Virus Research, Kyoto University, Japan
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95
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Tanamoto K, Azumi S, Haishima Y, Kumada H, Umemoto T. The lipid A moiety of Porphyromonas gingivalis lipopolysaccharide specifically mediates the activation of C3H/HeJ mice. J Immunol 1997; 158:4430-6. [PMID: 9127008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
The lipid A preparation isolated from Porphyromonas gingivalis was found to induce splenocyte mitogenicity and TNF-alpha release from peritoneal macrophages in LPS-unresponsive C3H/HeJ mice to the same extent as in LPS-responsive mice. In order to clarify whether the activation of C3H/HeJ mice was specifically caused by the lipid A and not by contaminating protein, two strategies were employed. The lipid A fraction from P. gingivalis was subjected to either hydrochloric acid or alkaline treatment to eliminate either glycosylated phosphate or O-acylated fatty acids from the lipid A structure, and the biologic activities of the derivatives were compared in both LPS-responsive and unresponsive C3H/HeJ mice. De-1-O-phosphorylated P. gingivalis lipid A showed partial loss, and de-O-acylated lipid A complete loss of splenocyte mitogenic and TNF-alpha-inductive activities from peritoneal macrophages in both LPS-responsive and unresponsive mice. The relative activities of the intact and treated lipid A compounds in splenocyte mitogenicity and TNF-alpha-inductive activity in macrophages were similar to the relative activities of these preparations in Limulus gelation activities. The LPS-specific antagonist, succinylated lipid A precursor, inhibited P. gingivalis lipid A-mediated splenocyte mitogenicity and TNF-alpha induction in macrophages in a similar manner in LPS-responsive and unresponsive mice. These results strongly suggest that the activation of LPS-unresponsive C3H/HeJ mice by P. gingivalis lipid A was specifically mediated by the lipid A portion and not by contaminating protein. The characteristic action of P. gingivalis lipid A on LPS-unresponsive C3H/HeJ mice was thought to reflect the unique chemical properties of this compound.
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Affiliation(s)
- K Tanamoto
- Division of Microbiology, National Institute of Health Sciences, Setagaya-ku, Tokyo, Japan
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96
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Umemoto T, Kumada H, Watanabe K. [Chemical structure and biological activities of Porphyromonas gingivalis lipid A]. Nihon Saikingaku Zasshi 1997; 52:475-83. [PMID: 9155204 DOI: 10.3412/jsb.52.475] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- T Umemoto
- Department of Oral Microbiology, Kanagawa Dental College
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97
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Umemoto T, Nakazawa F, Hoshino E, Okada K, Fukunaga M, Namikawa I. Treponema medium sp. nov., isolated from human subgingival dental plaque. Int J Syst Bacteriol 1997; 47:67-72. [PMID: 8995804 DOI: 10.1099/00207713-47-1-67] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
A new Treponema species, for which we propose the name Treponema medium, was isolated from subgingival plaque from an adult with periodontal disease. The morphological characteristics, differential biochemical characteristics, and protein profiles on sodium dodecyl sulfate-polyacrylamide gel electrophoresis gels of this organism are described. The guanine-plus-cytosine content of the DNA of T. medium is 51 mol%. The levels of DNA-DNA relatedness of the new species to other Treponema species, including Treponema denticola, Treponema vincentii, Treponema socranskii, Treponema pallidum, and Treponema phagedenis, are less than 30%. A phylogenetic analysis based on 16S rRNA sequences distinguished the new Treponema strain from strains belonging to previously described Treponema species. The type strain of T. medium is strain G7201.
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Affiliation(s)
- T Umemoto
- Department of Oral Microbiology, School of Dentistry, Asahi University, Gifu, Japan.
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98
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Kato M, Saji S, Tsuya H, Miya K, Fukada D, Umemoto T, Kunieda K, Takao H, Sugiyama Y, Tsuji K, Sato M. Clinical study of the relationship between cytological behavior and postoperative prognosis in colorectal cancer cases with special reference to nuclear DNA content and nucleolar organizer regions. J Surg Oncol 1997; 64:36-41. [PMID: 9040799 DOI: 10.1002/(sici)1096-9098(199701)64:1<36::aid-jso8>3.0.co;2-q] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
BACKGROUND We studied the usefulness of nuclear DNA patterns and argyrophylic nucleolar organizer regions (AgNORs) for evaluating the malignant potential of colorectal cancers, which is increasingly being regarded as important in predicting patients' prognosis and for their appropriate postoperative management. METHODS We measured these two factors in curatively resected specimens of 91 colorectal cancer cases, which were followed up for 1,549 +/- 788 days postoperatively. Ploidy pattern was either diploid or aneuploid, and AgNORs score was either low (LS) or high (HS). Thus, we classified our cases into Group I (diploid, LS). Group II (aneuploid, LS), Group III (diploid, HS), and Group IV (aneuploid, HS). Postoperative survival curves in the cases belonging to these groups were analyzed. RESULTS Survival rates in Groups I and II were significantly higher than those in Group IV. Correlation between subgroups and clinicopathological factors such as average age, histologic type, depth of invasion, and histologic stage were observed. Incidence of lymph node metastasis at the time of operation and that of postoperative recurrence were higher in group IV than that in groups I and II. CONCLUSIONS Measurement of DNA ploidy patterns and AgNORs score were found to be useful in evaluating malignant potential of colorectal cancers.
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Affiliation(s)
- M Kato
- Second Department of Surgery, Gifu University School of Medicine, Japan
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99
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Abstract
This review briefly introduces the principles of the atomic force microscope (AFM) and shows our own results of AFM application to biological samples. The AFM, invented in 1986, is an instrument that traces the surface topography of the sample with a sharp probe while monitoring the interaction forces working between the probe and sample surface. Thus, the AFM provides three-dimensional surface images of the sample with high resolution. The advantage of the AFM for biologists is that AFM can visualize non-conductive materials in a non-vacuous (i.e., air or liquid) environment. AFM images of the plasmid DNA are comparable to those by transmission electron microscopy using a rotary shadowing technique, and have the advantage of examining directly the molecule without staining nor coating. The surface structure of human metaphase chromosomes and mouse collagen fibrils demonstrated in air by the non-contact mode AFM is comparable to that obtained by scanning electron microscopy. Quantitative information on the heights of structures is further obtainable from the AFM images. Embedment-free thin tissue-sections are useful for observing intracellular structures by AFM. The present review also shows AFM images of living cultured cells which have been collected in a contact mode in liquid. This technique afforded us three-dimensional observation of the cellular movement with high resolution. Although there are some innate limitations for AFM imaging, the AFM has great potential for providing valuable new information in histology and cytology.
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Affiliation(s)
- T Ushiki
- Department of Anatomy, Niigata University School of Medicine, Japan
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100
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