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| Registros recuperados: 17 | |
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| Musinguzi, Simon Peter; Suganuma, Keisuke; Asada, Masahito; Laohasinnarong, Dusit; Sivakumar, Thillaiampalam; Yokoyama, Naoaki; Namangala, Boniface; Sugimoto, Chihiro; Suzuki, Yasuhiko; Xuan, Xuenan; Inoue, Noboru. |
| We screened cattle and goats from the districts of Chama, Monze and Mumbwa in Zambia for animal African trypanosomes, Babesia bigemina and Theileria parva using PCRs; 38.1% of the samples tested positive for at least one of the parasite species. The most common parasite was Trypanosoma vivax (19.8%). Its incidence was significantly higher in goats than in cattle, (P<0.05). B. bigemina was found in samples from all the three areas, making it the most widespread of the parasites in Zambia. Among the tested samples, 12.0% of the positive samples were mixed infections. There were significant differences in the infection rates of T. vivax (Mumbwa had a significantly higher infection rate [39.6%, P<0.0001]), Th. parva (Monze had the only cases... |
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Palavras-chave: Animal African trypanosomosis; Cattle; Goat; Piroplasmosis; Zambia. |
| Ano: 2016 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4389 |
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| Thekisoe, Oriel M. M.; Honda, T; Fujita, H; Battsetseg, B; Hatta, T; Fujisaki, Kozo; Sugimoto, Chihiro; Inoue, Noboru. |
| Common arthropod vectors for trypanosomes are flies, fleas and bugs. This study reports on an unknown trypanosome species isolated from naturally infected Haemaphysalis hystricis ticks, hereby, referred to as Trypanosoma KG1 isolate. The parasite has been successfully cultured in vitro with L929 or HEK 293T cell line as feeder cells. This trypanosome cannot survive in vitro without feeder cells. Following experimental infections of ticks, the trypomastigote-like and the epimastigote-like forms of this trypanosome could be detected by Giemsa-stained smears of the midgut and salivary glands of Ornithodoros moubata ticks which were made to feed on a culturing medium containing Trypanosoma KG1 isolate through an artificial membrane. Trypanosoma KG1 isolate... |
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Palavras-chave: Trypanosoma KG1 isolate; Haemaphysalis hystricis; Ornithodoros moubata. |
| Ano: 2007 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1047 |
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| Zhang, Houshuang; Compaore, Muller K.A.; Lee, Eung-goo; Liao, Min; Zhang, Guohong; Sugimoto, Chihiro; Fujisaki, Kozo; Nishikawa, Yoshifumi; Xuan, Xuenan. |
| The cross-reactive antigens of Neospora caninum and Toxoplasma gondii are important in the exploration to determine the common mechanisms of parasite-host interaction. In this study, a gene encoding N. caninum apical membrane antigen 1 (NcAMA1) was identified by immunoscreening of a N. caninum tachyzoite cDNA expression library with antisera. from mice immunized with recombinant T gondii apical membrane antigen 1 (TgAMA 1). NcAMA1 was encoded by an open reading frame of 1695 bp, which encoded a protein of 564 amino acids. The single-copy NcAMA1 gene was interrupted by seven introns. NcAMA1 showed 73.6% amino acid identity to TgAMA1. Mouse polyclonal antibodies raised against the recombinant NcAMA1 (rNcAMA1) recognized a 69-kDa native parasite protein by... |
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Palavras-chave: Neospora caninum; Toxoplasma gondii; Apical membrane antigen 1; Cross-reactive; Invasion. |
| Ano: 2007 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1034 |
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| Jia, Honglin; Nishikawa, Yoshifumi; Luo, Yuzi; Yamagishi, Junya; Sugimoto, Chihiro; Xuan, Xuenan. |
| The M17 family leucine aminopeptidase (LAP) hydrolyze amino acids from the N-terminus of peptides. Many LAPs from parasitic protozoa including Plasmmodium, Trypanosoma and Leishmania, have been intensely investigated because of their crucial roles in parasite biology. In this study, a functional recombinant Toxoplasma gondii LAP (rTgLAP) was expressed in Escherichia coli and its enzymatic activity against synthetic substrates for aminopeptidase, as well as the cellular localization was determined. Our results indicated that TgLAP is a functional aminopeptidase in the cytoplasma of T. gondii. |
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Palavras-chave: Toxoplasma gondii; Leucine aminopeptidase; Enzymatic activity. |
| Ano: 2010 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2822 |
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| Fukumoto, Shinya; Sekine, Yukiko; Kimbita, Elikira; Huang, Xiaohong; Xuan, Xuenan; Inoue, Noboru; Yokoyama, Naoaki; Igarashi, Ikuo; Fujisaki, Kozo; Sugimoto, Chihiro; Nagasawa, Hideyuki; Mikami, Takeshi; Suzuki, Hiroshi; 福本, 晋也; 玄, 学南; 井上, 昇; 横山, 直明; 五十嵐, 郁男; 鈴木, 宏志. |
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Palavras-chave: Babesia gibsoni; Babesia canis; CDNA library; ELISA; P30 gene. |
| Ano: 2002 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/624 |
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| Zhang, Houshuang; Lee, Eung-goo; Liao, Min; Compaore, Muller K.A.; Zhang, Guohong; Kawase, Osamu; Fujisaki, Kozo; Sugimoto, Chihiro; Nishikawa, Yoshifumi; Xuan, Xuenan. |
| The characterization of the cross-reactive antigens of two closely related apicomplexan parasites, Neospora caninum and Toxoplasma gondii, is important to elucidate the common mechanisms of parasite–host interactions. In this context, a gene encoding N. caninum ribosomal phosphoprotein P0 (NcP0) was identified by immunoscreening of a N. caninum tachyzoite cDNA expression library with antisera from mice immunized with T. gondii tachyzoites. The NcP0 was encoded by a gene with open reading frame of 936 bp, which encoded a protein of 311 amino acids. The NcP0 gene existed as a single copy in the genome and was interrupted by a 432 bp intron. The NcP0 showed 94.5% amino acid identity to T. gondii P0 (TgP0). Anti-recombinant NcP0 (rNcP0) sera recognized a... |
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Palavras-chave: Neospora caninum; Toxoplasma gondii; Ribosomal phosphoprotein P0; Cross-reactive. |
| Ano: 2007 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1035 |
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| Thekisoe, Oriel M.M.; Rambritch, Natasha E.; Nakao, Ryo; Bazie, Raoul S.; Mbati, Peter; Namangala, Boniface; Malele, Imna; Skilton, Robert A.; Jongejan, Frans; Sugimoto, Chihiro; Kawazu, Shin-Ichiro; Inoue, Noboru. |
| We have developed two loop-mediated isothermal amplification (LAMP) assays for the detection of Theileria parva, the causative agent of East Coast fever (ECF), an economically important cattle disease in eastern, central and southern Africa. These assays target the polymorphic immunodominant molecule (PIM) and p150 LAMP genes. The primer set for each gene target consists of six primers, and each set recognises eight distinct regions on the target gene to give highly specific detection of T. parva. The detection limit of each primer set is 1 fg, which is equivalent to one copy of the PIM and p150 T. parva genes. These PIM and p150 LAMP primer sets amplify DNA of T. parva isolates from cattle and buffalo from different countries including Kenya, South... |
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Palavras-chave: Theileria parva; LAMP; Buffalo; Cattle; Diagnosis. |
| Ano: 2010 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2672 |
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| Namangala, Boniface; Inoue, Noboru; Sugimoto, Chihiro; 井上, 昇. |
| Transforming growth factor beta-1 (TGF-β1) is a pleiotropic cytokine with both pro- and antiinflammatory properties, depending on its environment and concentration. The present study evaluated the effects of orally-delivered TGF-β1 on mice parenterally-infected with various protozoan parasites. We report that while orally-administered TGF-β1 seems to confer partial protection against murine chronic babesiosis and acute trypanosomosis, no beneficial clinical effects were observed against acute babesiosis, malaria or toxoplasmosis. Taken together, these preliminary data suggest that the systemic effects conferred by exogenous TGF-β1 could be parasite speciesspecific. The variations in different parasitic infections could be due to (i) intrinsic differences... |
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Palavras-chave: Low-dose; Mice; Orally-delivered TGF-β1; Protection; Protozoan parasites. |
| Ano: 2009 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2716 |
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| Tumurjav, Buyannemekh; Terkawi, Mohamad Alaa; Zhang, Houshuang; Zhang, Guohong; Jia, Honglin; Goo, Youn-Kyoung; Yamagishi, Junya; Nishikawa, Yoshifumi; Igarashi, Ikuo; Sugimoto, Chihiro; Xuan, Xuenan. |
| Toxoplasma gondii matrix antigen 1 (TgMAG1), known as the 65-kDa protein, which is abundantly expressed in both bradyzoites and tachyzoites, was evaluated as a candidate for the development of a diagnostic reagent for ovine toxoplasmosis. The TgMAG1 gene was expressed in Escherichia coli as a fusion protein with glutathione S-transferase (GST),and the recombinant TgMAG1 (rTgMAG1) was tested in an enzyme-linked immunosorbent assay (ELISA). The ELISA with rTgMAG1 showed a highly specific reaction with sera from mice experimentally infected with T. gondii but not with the closely related Neospora caninum. The antibodies to TgMAG1 were detectable from the acute to the chronic infectious stages in a mouse model. A total of 175 serum samples collected from sheep... |
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Palavras-chave: ELISA; Mongolia; Sheep; TgMAG1; Toxoplasma gondii. |
| Ano: 2010 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3018 |
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| Thekisoe, Oriel M. M.; Kuboki, Noritaka; Nambota, Andrew; Fujisaki, Kozo; Sugimoto, Chihiro; Igarashi, Ikuo; Yasuda, Jun; Inoue, Noboru. |
| In this study, we developed loop-mediated isothermal amplification (LAMP) for the specific detection of both animal and human trypanosomosis using primer sets that are designed from 5.8S rRNA-internal transcribed spacer 2 (ITS2) gene for Trypanosoma brucei gambiense, 18S rRNA for both T. congolense and T. cruzi, and VSG RoTat 1.2 for T. evansi. These LAMP primer sets are highly sensitive and are capable of detecting down to 1 fg trypanosomal DNA, which is equivalent to 0.01 trypanosomes. LAMP is a rapid and simple technique since it can be carried out in 1 h and requires only a simple heating device for incubation. Therefore, LAMP has great potential of being used for diagnosis of trypanosomosis in the laboratory and the field, especially in countries that... |
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Palavras-chave: LAMP; Trypanosomosis; Trypanosoma brucei brucei; T. b. rhodesiense; T. b. gambiense; T. congolense; T. cruzi; T. evansi. |
| Ano: 2007 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1045 |
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| Buates, S.; Xuan, Xuenan; Igarashi, Makoto; Sugimoto, Chihiro; Inoue, Noboru; 玄, 学南; 五十嵐, 慎; 井上, 昇. |
| Toxoplasma gondii microneme protein 2 (TgMIC2), an apically stored adhesin, was shown to be a key participant involved in the initial attachment and invasion to a host cell. In this study, we had established the clonal line of T. gondii tachyzoites which over-expressed TgMIC2 using the tetracycline repressor (TetR)-based inducible gene expression system. The TgMIC2 over-expression significantly reduced tachyzoite propagation in vitro (p < 0.002) and significantly reduced the parasite virulence in mice (p = 0.002). The over-expression of exogenous TgMIC2 caused the increase of mRNA expression level of endogenous TgMIC2. Wild type parasites mainly expressed TgMIC2115 protein, the microneme store and the surface form of TgMIC2. Over-expression of TgMIC2... |
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Palavras-chave: Toxoplasma gondii; TgMIC2; Over-expression. |
| Ano: 2008 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2236 |
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| Kuboki, Noritaka; Kibe, Michael K; Thekisoe, Oriel M. M.; Sugimoto, Chihiro; Inoue, Noboru. |
| With the hypothesis that African trypanosomes could have in vivo specific genes for adaptation to host’s environment, the present study was conducted by using suppressive subtractive hybridization (SSH) technique to seek the highly expressed genes especially in host. A total of 328 clones from the in vivo SSH library and that of 160 clones from the in vitro SSH library were analyzed in order to determine their expression levels, but none of the above-mentioned genes showed differential expression. This indicates that no trypanosome genes could be differentially expressed either the in vivo or in vitro propagated trypanosomes. Alternatively, there might be limitation for detecting specifically expressed genes in African trypanosomes using this method,... |
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Palavras-chave: Differential expression; Infection; Trypanosoma brucei. |
| Ano: 2007 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1052 |
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| Registros recuperados: 17 | |
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