Consulta: "玄  学南"
Registros recuperados: 37
Data/hora: 16/06/2024 09:31:52

異種遺伝子発現用原虫ベクターの開発と応用
Provedor de dados: 19
Autores: 玄, 学南.
発行年は推定
Ano: 2007
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3507

原虫病診断技術の開発
Provedor de dados: 19
Autores: 五十嵐, 郁男; 横山, 直明; 井上, 昇; 玄, 学南.
発行年は推定
Ano: 2007
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3515

CURRENT SERODIAGNOSTIC MEASURES FOR EQUINE BABESIOSIS
Provedor de dados: 19
Autores: Hirata, Haruyuki; Yokoyama, Naoaki; Xuan, Xuenan; Igarashi, Ikuo; 横山, 直明; 玄, 学南; 五十嵐, 郁男.
Palavras-chave: Babesia equi; Babesia caballi; Diagnosis; ELISA; ICT.
Ano: 2004
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/638

Toxoplasma gondii modulates neutral lipid metabolism in macrophage J774 cells
Provedor de dados: 19
Autores: Kameyama, K; Nishimura, M; Ybañez, R.D.; Hiasa, J; Xuan, X; Nishikawa, Y; 玄, 学南; 西川, 義文.
Palavras-chave: Toxoplasma gondii; Cholesterol; Triacylglycerols; Lipid bodies.
Ano: 2011
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3129

Characterization of P15 Antigen of Cryptosporidium parvum Expressed by a Recombinant Vaccinia Virus
Provedor de dados: 19
Autores: Xuan, Xuenan; Zhang, Sofa; Kamio, Tsugihiko; Tsushima, Y.; Kamada, Takenori; Nishikawa, Yoshifumi; Otsuka, Haruki; Karanis, Panagiotis; Igarashi, Ikuo; Nagasawa, Hideyuki; Fujisaki, Kozo; Mikami, Takeshi; 玄, 学南; 西川, 義文; 五十嵐, 郁男.
Palavras-chave: C. parvum; P15; Vaccinia virus; Subunit vaccine.
Ano: 1999
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/314

韓国及び中国東北地方におけるダニ媒介性動物原虫感染症の分子疫学的調査研究
Provedor de dados: 19
Autores: 玄, 学南; XUAN, XUENAN.
2005年度～2008年度科学研究費補助金基盤研究(B)研究成果報告書17405043
Palavras-chave: 原虫感染症; ダニ媒介; バベシア原虫; 血清診断; 遺伝子診断; 疫学調査; 韓国; 中国.
Ano: 2009
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2744

Detection of Antibodies to Babesia equi by The Latex Agglutination Test with Recombinant Merozoite Antigen-2
Provedor de dados: 19
Autores: Tanaka, Tetsuya; Xuan, Xuenan; Igarashi, Ikuo; Nagasawa, Hideyuki; Fujisaki, Kozo; Suzuki, Naoyoshi; Mikami, Takeshi; 玄, 学南; 五十嵐, 郁男.
Palavras-chave: Babesia equi; EMA-2; Baculovirus; Latex agglutination test.
Ano: 1999
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/329

Non-invasive Method of Identification of SAG-1 Transgenic Mice by PCR Analysis of Oral Wash Cells
Provedor de dados: 19
Autores: Seng, Seyha; Maki, Yoshiyuki; Yokoyama, Minesuke; Suzuki, R.; Kato, Mihoko; Bray, R. L.; Lim, C.; Zayatiin, Batsukh; Kamada, Takenori; Inoue, Noboru; Xuan, Xuenan; Igarashi, Ikuo; Nagasawa, Hideyuki; Fujisaki, Kozo; Mikami, Takeshi; Suzuki, Naoyoshi; Toyoda, Yutaka; 井上, 昇; 玄, 学南.
Palavras-chave: SAG-1; Oral wash and two-step polymerase chain reaction.
Ano: 1999
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/311

CLONING AND EXPRESSION OF AN ANTIGEN OF BABESIA GIBSONI IN ESCHERICHIA COLI AND ITS USE FOR THE IMMUNODIAGNOSIS OF CANINE BABESIOSIS
Provedor de dados: 19
Autores: 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.
Palavras-chave: Babesia gibsoni; Babesia canis; CDNA library; ELISA; P30 gene.
Ano: 2002
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/624

Serological evidence of infection of Anaplasma and Ehrlichia in domestic animals in Xinjiang Uygur Autonomous Region area, China
Provedor de dados: 19
Autores: Chahan, Bayin; Jian, Zijian; Xuan, Xuenan; Sato, Yukita; Kabeya, Hidenori; Tuchiya, Kotaro; Itamoto, Kazuhito; Okuda, Masaru; Mikami, Takeshi; Maruyama, Soichi; Inokuma, Hisashi; 玄, 学南; 猪熊, 壽.
Serological methods were utilized to detect Anaplasma and Ehrlichia infection in domestic animals in Xinjiang Uygur Autonomous Region, China. By using an indirect immunofluorescence assay (IFA), antibodies that reacted with Anaplasma phagocytophilum and Ehrlichia chaffeensis were detected mainly in ruminants kept on pastureland in Altai, Ili and Kashgar area. Antibody titers up to 1:320 were recorded. These results indicate that ruminants kept in these areas may be infected with some species of Anaplasma and Ehrlichia.
Palavras-chave: Anaplasma; Ehrlichia domestic animals seroepidemiology Xinjiang Uygur Autonomous Region China.
Ano: 2005
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/742

Clinical usefulness of antibodies against Babesia gibsoni detected by ELISA with recombinant P50
Provedor de dados: 19
Autores: Miyama, Takako; Inokuma, Hisashi; Itamoto, Kazuhito; Okuda, Masaru; Verdida, Rodolfo A.; Xuan, Xuenan; 猪熊, 壽; 玄, 学南.
The clinical usefulness of antibodies against Babesia gibsoni detected by ELISA with recombinant P50 was examined in dogs in an area where B. gibsoni infection was endemic. Only 8 among 14 dogs with acute type B. gibsoni infection without a previous history of infection were positive. This high percentage of false-negative results is thought to be a weak point of ELISA as a diagnostic tool. However, 14 other anemic dogs with a confirmed history of B. gibsoni infection were all positive, thus confirming the higher sensitivity of ELISA in detecting a history of infection.
Palavras-chave: Babesia gibsoni; Diagnosis; ELISA.
Ano: 2006
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/925

TRANSIENT EXPRESSION OF A GREEN FLUORESCENT PROTEIN GENE IN BABESIA BOVIS
Provedor de dados: 19
Autores: Fujii, Kei; Yokoyama, Naoaki; Takabatake, Noriyuki; Suzuki, Hiroshi; Xuan, Xuenan; Igarashi, Ikuo; 横山, 直明; 鈴木, 宏志; 玄, 学南; 五十嵐, 郁男.
In hemoprotozoa，gene transfer technology provides an important tool to aid in the functional study of parasite genes. In this study，a transfer vector containing the enhanced green fluorescent protein (EGFP) gene laid between the Toxoplasma gondii GRAI promoter region and the GRA2 polyA signal region was constructed and transfected into the in vitro culture of Babesia boνis by the electroporation method.On the first and second days post-transfection，clear positive fluorescences were detected in some parasite bodies， indicating the successful expression of the EGFP gene controlled by the GRA-1 promoter in B. bovis. However， the positive parasites were not ubiquitous and finally disappeared until the forth day post-transfection. This is the first time that...
Ano: 2003
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/631

種特異的ELISAによる日本の犬におけるNeospora caninumの血清疫学調査(寄生虫病学)
Provedor de dados: 19
Autores: 久保田, 直樹; 坂田, 義美; 宮崎, 直美; 板本, 和仁; 坂内, 天; 西川, 義文; 玄, 学南; 猪熊, 壽; NISHIKAWA, Yoshifumi; XUAN, Xuenan; INOKUMA, Hisashi.
組換抗原を用いた種特異的ELISAにより,犬のNeospora caninum感染について全国的血清疫学調査を実施した.1,206頭中全国30県から126頭(10.4%)が陽性を示した.陽性率は,雄よりも雌で有意に高く,また他品種と比較して有意に高い陽性率を示す品種がみられた.子宮蓄膿症および糖尿病の病歴を有する犬の陽性率は,他の疾病を有する犬または疾病のない犬の陽性率に比べて高値であった.  A seroepidemiological survey of Neospora caninum infection among dogs in Japan was conducted using species-specific enzyme-linked immunosorbent assay with recombinant surface antigen (Nc-SAG1t). Among 1,206 dogs examined, 126 dogs (10.4%) from 30 prefectures from Hokkaido to Okinawa were positive to N. caninum infections, which were more frequently detected in females than males. Siberian Huskies showed the highest positive rate compared with the other breeds. Dogs with pyometra and diabetes mellitus showed the higher positive rates than dogs with other...
Palavras-chave: Canine; Nbospora caninum; Species-specific ELISA.
Ano: 2008
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4003

Phylogenetic analysis of Theileria orientalis in cattle bred in Fujian province，China
Provedor de dados: 19
Autores: Sivakumar, T; Khukhuu, A; Igarashi, I; Xuan, X; Guo, G; Huang, X; Yokoyama, N; 五十嵐, 郁男; 玄, 学南; 横山, 直明.
A molecular epidemiological survey on Theileria orientalis was conducted in a cattle population of Fujian province in China. The screening polymerase chain reaction assay showed that 23 (45%) of 51 blood samples were positive for T. orientalis. DNA sequencing of the major piroplasm surface antigen-encoding gene indicated the presence of 3 different genotypes in the study area(types 1，2，and 5) and identified T. orientalis types 1 and 2 as the major genotypes in the sample population.  Because type 2 (Ikeda type in Japan) has been recognized as a relatively virulent genotype of T. orientalis，control and preventive measures to minimize the incidence of infectious diseases among cattle bred in China are necessary.
Palavras-chave: Theileria orientalis; Cattle; China; Epidemiology; Genotype.
Ano: 2011
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3098

プロテオーム解析によるネオスポラ原虫感染機構の解明と新規予防・治療法開発への応用
Provedor de dados: 19
Autores: 玄, 学南; XUAN, XUENAN.
本研究では、プロテオミックス法によるネオスポラ原虫の全虫体タン パク質の網羅的解析を行った。MALDI-TOF-MS 解析により約600 種類の可視化されたタンパク質 の中から約60 種類のタンパク質の同定に成功した。そのうちの一部は原虫の宿主細胞への吸 着・侵入ならびにエネルギー代謝に関わるタンパク質であることが示唆された。これらの成果 は、ネオスポラ原虫の新規ワクチン・治療薬開発に繋がるものとして期待される。 The aims of this study were to widen our view on the global expression of protein profile of Neospora caninum parasite and to discover vaccine and drug target molecules for control of neosporosis. Approximately 600 protein spots were detected on 2-DE, and 60 proteins were identified by MALDI-TOF-MS analysis. Some of the identified proteins were predicted to be involved in the invasion of the parasite into the host cells and in parasite metabolism. Therefore, some of these proteins could be potential vaccine candidates and drug targets.
Palavras-chave: ネオスポラ; トキソプラズマ; プロテオミックス; ワクチン; 治療薬; MALDI-TOF-MS; 抗原; 酵素.
Ano: 2010
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2759

Epidemiological Survey of Theileria Parasite Infection of Cattle in Northeast China by Allele-Specific PCR
Provedor de dados: 19
Autores: YU, Longzheng; ZHANG, Shoufa; LIANG, Wanfeng; JIN, Chunmei; JIA, Lijun; LUO, Yuzi; LI, Yan; CAO, Shinuo; YAMAGISHI, Junya; NISHIKAWA, Yoshifumi; KAWANO, Suguru; FUJISAKI, Kozo; XUAN, Xuenan; 西川, 義文; 玄, 学南.
An epidemiological survey on a Theileria parasite infection of cattle in Northeast China was carried out using allele-specific PCR and DNA sequence analysis of the major piroplasm surface protein (MPSP) gene. The results showed that 14 of 104 blood samples were positive for Theileria by PCR. Among the positive cases, co-infection with various combinations of C- and I-type parasites was detected in 12 samples; no B- and Thai-type parasites were detected by allele-specific PCR. Phylogenetic analysis based on the MPSP gene sequences revealed that Theileria parasites with the MPSP types 1, 2, and 4 were distributed in Northeast China.
Palavras-chave: Major piroplasm surface protein; PCR; Theileria.
Ano: 2011
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3586

Epidemiological Survey of Babesia bovis and Babesia bigemina Infections of Cattle in Philippines
Provedor de dados: 19
Autores: YU, Longzheng; TERKAWI, Mohmad Alaa; CRUZ-FLORES, Mary Jane; G. CLAVERIA, Florencia; ABOGE, Gabriel Oluga; YAMAGISHI, Junya; GOO, Youn-Kyoung; CAO, Shinuo; MASATANI, Tatsunori; NISHIKAWA, Yoshifumi; XUAN, Xuenan; 西川, 義文; 玄, 学南.
A total of 250 blood samples were collected from clinically healthy cattle in five provinces of Philippines. DNA was extracted from the samples and analyzed by nested PCR assays for an epidemiological survey of Babesia bovis and Babesia bigemina infections. Out of the 250 samples, 27 (10.8%) and 16 (6.4%) were positive for B. bovis infection and B. bigemina infection, respectively. Mixed infections were detected in a total of 4 samples (1.6%). Our data provide baseline information regarding the epidemiology of B. bovis and B. bigemina infections in cattle in Philippines, which can be utilized in developing proper strategies for disease control and management.
Palavras-chave: Babesia bigemina; Babesia bovis; NPCR; Philippines.
Ano: 2013
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3919

Molecular and Immunological Characterization of a Novel 32-kDa Secreted Protein of Babesia microti
Provedor de dados: 19
Autores: Ooka, Hideo; Terkawi, Mohamad A; Cao, Shinuo; Aboge, Gabriel; Goo, Youn-Kyoung; Luo, Yuzi; Li, Yan; Nishikawa, Yoshifumi; Igarashi, Ikuo; Xuan, Xuenan; 西川, 義文; 五十嵐, 郁男; 玄, 学南.
A cDNA encoding the Babesia microti 32-kDa protein was identified by serological immunoscreening of a cDNA expression library and designated as BmP32. The full length of BmP32 contains an open reading frame of 918 base pairs consisting of 306 amino acids having a significant homology with B. microti secreted antigen 1. Antiserum raised against recombinant protein (rBmP32) specifically reacted with a 32-kDa native protein of the parasite lysate using western blot analysis. The indirect immunofluorescent antibody test showed a preferable localization of BmP32 in the cytoplasm of the intra- and extracellular parasites. Moreover, BmP32 was secreted in the cytosol of infected erythrocytes, especially during the peak parasitemia and the recovery phase of the...
Ano: 2012
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3820

Diagnosis of Babesia caballi Infection in Horses by Polymerase Chain Reaction
Provedor de dados: 19
Autores: Xuan, Xuenan; Igarashi, Ikuo; Avarzed, A.; Ikadai, Hiromi; Inoue, Noboru; Nagasawa, Hideyuki; Fujisaki, Kozo; Toyoda, Yutaka; Suzuki, Naoyoshi; Mikami, Takeshi; 玄, 学南; 五十嵐, 郁男; 井上, 昇.
A set of primers were designed according to the published sequence of the gene encoding a rhoptry protein of Babesia caballi,  and used to amplify parasite DNA from the blood samples obtained from carrier horses by polymerase chain reaction（PCR）method．The PCR method was sensitive enough to detect parasite DNA from 2.5 μl blood sample with a parasitemia of 0.000001％. The PCR method was compared with fluorescent antibody test(IFAT) in order to evaluate the diagnosis effciency for B. caball infection in horses. Of 142 field samples from Mongolia, 28(20%) and 96(69%)samples were identified positively by PCR and IFAT, respectively. Although the sensitivity of PCR was lower than IFAT, it was noted that the 5 IFAT-negative samples were PCR-positive, suggesting...
Palavras-chave: Babesia caballi; PCR; IFAT.
Ano: 1998
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/281

Identification of a novel gene encoding a secreted antigen 1 of Babesia gibsoni and evaluation of its use in serodiagnosis
Provedor de dados: 19
Autores: Jia, Honglin; Zhou, Jinlin; Ikadai, Hiromi; Matsuu, Aya; Suzuki, Hiroshi; Fujisaki, Kozo; Xuan, Xuenan; 鈴木, 宏志; 五十嵐, 郁男; 玄, 学南.
Serum from a dog immunized with blood plasma from a B. gibsoni-infected dog, putatively containing secreted antigens, was used to screen a cDNA expression library. A novel gene encoding BgSA1 was identified from the isolated clones. The serum raised in mice immunized with the recombinant BgSA1 expressed in Escherichia coli could recognize a native parasite protein with a molecular mass of 59 kDa. Comparing with the previously established ELISA with recombinant P50 as antigen, the ELISA with recombinant BgSA1 as the antigen was more sensitive when they were used to detect field samples. Moreover, a sandwich ELISA with anti-BgSA1 antibodies could detect the circulating BgSA1 in a serial blood plasma from a dog experimentally infected with B. gibsoni. These...
Palavras-chave: Babesia gibsoni; Secreted Antigen 1; Identification; Serodiagnosis.
Ano: 2006
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1655

Host Cholesterol Synthesis Contributes to Growth of Intracellular Toxoplasma gondii in Macrophages
Provedor de dados: 19
Autores: NISHIKAWA, Yoshifumi; IBRAHIM, Hany M.; KAMEYAMA, Kyohko; SHIGA, Ikumi; HIASA, Jun; XUAN, Xuenan; 西川, 義文; 玄, 学南.
The intracellular protozoan Toxoplasma gondii lacks the ability to synthesize sterol and scavenges cholesterol from the lowdensity lipoprotein receptor (LDLR) pathway of its host to facilitate replication. Sterol biosynthesis inhibitors, however, have a demonstrated anti-Toxoplasma effect. In this study, we examined the host mevalonate pathway as a novel source of cholesterol for T. gondii and its effects on parasite growth in macrophages. Parasite growth did not significantly change in the absence of LDLR or when LDL was exogenously supplemented. Lovastatin and compactin, both inhibitors of hydroxymethylglutaryl-CoA (HMG-CoA) reductase in the mevalonate pathway, significantly inhibited T. gondii growth in both wild-type and LDLR-knockout macrophages....
Palavras-chave: Cholesterol; Lipid metabolism; Macrophage; Parasitology; Toxoplasma gondii.
Ano: 2011
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3583

Identification, Cloning and Characterization of BmP41, a Common Antigenic Protein of Babesia microti
Provedor de dados: 19
Autores: MASATANI, Tatsunori; OOKA, Hideo; TERKAWI, Mohamad A.; CAO, Shinuo; LUO, Yuzi; ASADA, Masahito; HAYASHI, Kei; NISHIKAWA, Yoshifumi; XUAN, Xuenan; 西川, 義文; 玄, 学南.
Babesia microti is a rodent tick-borne blood parasite and the major causative agent of emerging human babesiosis. Here, we identified a candidate of common antigenic protein BmP41 of B. microti by serological screening of cDNA library of human-pathogenic Gray strain with antisera against rodent Munich strain. Immunofluorescent antibody test using mouse anti-recombinant BmP41 (rBmP41) serum revealed that native BmP41 was expressed in each of the developmental stages of B. microti merozoites. An enzyme-linked immunosorbent assay (ELISA) using rBmP41 detected specific antibodies in sera from hamsters infected with B. microti Gray strain and mice infected with B. microti Munich strain. Taken together, BmP41 could be a promising universal serological marker for...
Palavras-chave: Babesia microti; BmP41; Common antigen; ELISA; Immunoscreening.
Ano: 2013
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3917

Characterization of Toxoplasma gondii 5' UTR with Encyclopedic TSS Information
Provedor de dados: 19
Autores: Yamagishi, J.; Watanabe, J.; Goo, Y. K.; Masatani, T.; Suzuki, Y.; Xuan, X.; 玄, 学南.
The 5′ UTR is widely involved in gene expression via post-transcriptional regulation. However, a detailed profile of the 5′ UTR for Toxoplasma gondii has not yet been demonstrated. To investigate the issue, we compared the predicted open reading frames (ORFs) and transcription start sites (TSSs) of T. gondii obtained by TSS-seq, a method that enables analysis of encyclopedic TSSs with next-generation sequencers. As a result, it was demonstrated that the mode length of the 5′ UTR is between 120 and 140 nucleotides (nts) when a subset of genes with predicted signal peptides was examined. However, when genes without the signal peptide were examined, the length was extended to approximately 600 nts. Because additional information on the predicted signal...
Ano: 2012
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3822

Molecular Prevalence of Different Genotypes of Theileria orientalis Detected from Cattle and Water Buffaloes In Thailand
Provedor de dados: 19
Autores: Altangerel, Khukhuu; Sivakumar, Thillaiampalam; Inpankaew, Tawin; Jittapalapong, Sathaporn; Terkawi, Mohamad Alaa; Ueno, Akio; Xuan, Xuenan; Igarashi, Ikuo; Yokoyama, Naoaki; 玄, 学南; 五十嵐, 郁男; 横山, 直明.
Here we report on an epidemiological study regarding the molecular prevalence of different genotypes of Theileria orientalis present among domestic cattle and water buffalo populations bred in Thailand. A phylogenetic analysis based on the parasitic gene encoding a major piroplasm surface protein revealed the presence of 5 genotypes (Types 1, 3, 5, 7, and N-3) in cattle and 7 genotypes (Types 1, 3, 4, 5, 7, N-2, and N-3) in water buffaloes. Types 4, 7, and N-3 of T. orientalis were reported for the first time in water buffaloes. The previously reported C and Thai types from Thailand clustered as types 7 and 6, respectively, in the present analysis. Great similarities were observed among nucleotide sequences of isolates of the same genotype from cattle and...
Ano: 2011
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3592

Identification of a novel B. gibsoni 27-kDa protein as a serodiagnostic antigen
Provedor de dados: 19
Autores: Terkawi, M. A.; Aboge, G.; Jia, H.; Goo, Y-K.; Ooka, H.; Yamagishi, Junya; Nishikawa, Yoshifumi; Kawazu, Shin-ichiro; Fujisaki, K.; Xuan, Xuenan; 山岸, 潤也; 西川, 義文; 河津, 信一郎; 玄, 学南.
A novel gene encoding 27-kDa protein was identified by the screening of Babesia gibsoni cDNA library with acutely infected dog serum. The BgP27 is a single copy gene with a predicted open reading frame of 762 bp and 254 amino acids. The phylogenic analysis of the deduced amino acid of BgP27 demonstrated considerable identities with members of Plasmodium berghei circumsporozoite protein family that ranged between 18.4% and 22.8%. The BgP27 was expressed as a glutathione S-transferase fusion protein in Escherichia coli. The serum raised in mice against the recombinant protein specifically reacted with a 27-kDa protein in the extracts of B. gibsoni parasites. Confocal laser scanning microscopic observation showed high fluorescent reactivity with both...
Palavras-chave: Babesia gibsoni; Enzyme-linked immunosorbent assay; Deiagnostic performance.
Ano: 2008
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2232

Cloning and Characterization of a 2-Cys Peroxiredoxin from Babesia gibsoni
Provedor de dados: 19
Autores: MASATANI, Tatsunori; ASADA, Masahito; ICHIKAWA-SEKI, Madoka; USUI, Miho; TERKAWI, Mohamad A.; HAYASHI, Kei; KAWAZU, Shin-ichiro; XUAN, Xuenan; 河津, 信一郎; 玄, 学南.
Peroxiredoxins (Prxs) are a family of antioxidant enzymes. Here, we cloned a 2-Cys Prx, BgTPx-1, from the canine Babesia parasite B. gibsoni. Sequence identity between BgTPx-1 and 2-Cys Prx of B. bovis was 81% at the amino acid level. Enzyme activity assay by using recombinant BgTPx-1 (rBgTPx-1) indicated that BgTPx-1 has antioxidant activity. Antiserum from a mouse immunized with rBgTPx-1 reacted with parasite lysates and detect a protein with a monomeric size of 22 kDa and also a 44 kDa protein, which might be an inefficiently reduced dimer. BgTPx-1 was expressed in the cytoplasm of B. gibsoni merozoites. These results suggest that the BgTPx-1 may play a role to control redox balance in the cytoplasm of B. gibsoni.
Palavras-chave: Antioxidant activity; Babesia gibsoni; Canine; Peroxiredoxin.
Ano: 2014
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3925

Development and evaluation of an enzyme-linked immunosorbent assay using recombinant p23 for the detection of antibodies to Cryptosporidium parvum in cattle
Provedor de dados: 19
Autores: Bannai, Hiroshi; Nishikawa, Yoshifumi; Seo, Jin-yong; Nakamura, Chinatsu; Zhang, Sofa; Kimata, Isao; Takashima, Yasuhiro; Li, Junyou; Igarashi, Ikuo; Xuan, Xuenan; 西川, 義文; 五十嵐, 郁男; 玄, 学南.
An enzyme-linked immunosorbent assay (ELISA) based on the recombinant p23 of Cryptosporidium parvum was established for the detection of antibodies against C. parvum in cattle. The sensitivity and specificity of the ELISA were evaluated with the standard indirect fluorescent antibody test (IFAT) using sporozoites as antigens. Of 77 bovine sera collected from China, 20 (26.0%) were identified as positive by the IFAT. The same samples were tested with the ELISA. The optical densities at 415 nm were compared to the IFAT results and statistically analyzed to designate a provisional cut-off point. As a result, the cut-off point was concluded to be 0.08, which was considered to be the best condition in the light of its sensitivity (80%) and specificity (73.7%)....
Palavras-chave: Cryptosporidium parvum; P23; ELISA; IFAT.
Ano: 2006
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/142

Molecular Detection of Theileria Species in Sheep from Northern China
Provedor de dados: 19
Autores: CAO, Shinuo; ZHANG, Shoufa; JIA, Lijun; XUE, Shujiang; YU, Longzheng; KAMYINGKIRD, Ketsarin; MOUMOUNI, Paul Franck Adjou; MOUSSA, Ahmed Abd El Moniem; ZHOU, Mo; ZHANG, Yuanming; TERKAWI, Mohamad Alaa; MASATANI1), Tatsunori; NISHIKAWA, Yoshifumi; XUAN, Xuenan; 西川, 義文; 玄, 学南.
Ovine theileriosis is a tick-borne disease that restricts the development of small ruminant husbandry in northern China. In this study, we report on a molecular epidemiological survey of ovine Theileria spp. in 198 blood samples taken from sheep in northern China. The DNA samples were screened by a nested polymerase chain reaction (PCR) targeting the 18S rRNA gene of ovine Theileria spp. The prevalence of ovine Theileria spp. in Yanji, Nongan, Longjing, Toudao and Jinchang was 80%, 40%, 37%, 24% and 32%, respectively. The sequencing analyses approved the present of the T. orientalis and/or T. luwenshuni in these regions. Taken together, we have demonstrated a high incidence of Theileria spp. in northern China that calls for the need to design effective...
Palavras-chave: China; Ovine Theileria spp; Sheep; Theileria luwenshuni.
Ano: 2013
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3924

Molecular Epidemiological Survey of Theileria orientalis in Thua Thien Hue Province, Vietnam
Provedor de dados: 19
Autores: KHUKHUU, Altangerel; LAN, Dinh Thi Bich; LONG, Phung Thang; UENO, Akio; LI, Yan; LUO, Yuzi; MACEDO, Alan Caine Costa de; MATSUMOTO, Kotaro; INOKUMA, Hisashi; KAWAZU, Shin-Ichiro; IGARASHI, Ikuo; XUAN, Xuenan; YOKOYAMA, Naoaki; 松本, 高太郎; 猪熊, 壽; 河津, 信一郎; 五十嵐, 郁男; 玄, 学南; 横山, 直明.
Theileria orientalis is a benign bovine protozoan parasite that occasionally causes serious economic loss in the livestock industry. We report the findings of a molecular epidemiological survey of T. orientalis in 94 Vietnamese yellow cattle, 43 water buffaloes, 21 sheep, 21 goats and 85 blood-sucking ticks of cattle in the Thua Thien Hue province of Vietnam. The major piroplasm surface protein (MPSP) gene of T. orientalis was detected using polymerase chain reaction from 13 cattle (13.8%), 11 water buffaloes (25.6%), 1 sheep (4.8%) and 9 ticks (10.6%). Phylogenetic analysis using MPSP gene sequences showed the presence of seven genotypes, four previously categorized genotypes (Types 1, 3, 5 and 7) and three new genotypes (Types N-1, N-2 and N-3).
Palavras-chave: Cattle; Genotype; MPSP; Theileria orientalis; Vietnam.
Ano: 2011
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3585

Construction of the recombinant pseudorabies viruses expressing Cryptosporidium parvum an immunodominant surface protein, p23
Provedor de dados: 19
Autores: Takashima, Yasuhiro; Xuan, Xuenan; Nagasawa, Hideyuki; Matsumoto, Yasunobu; Igarashi, Ikuo; Fujisaki, Kozo; Mikami, Takeshi; Otsuka, Haruki; 玄, 学南; 五十嵐, 郁男.
To develop a vaccine against cryptosporidiosis in animals, we constructed recombinant pseudorabies virus (PrV), a member of the Herpesviridae Alphaherpesvirus subfamily, expressing an immunodominant surface protein p23 of Cryptosporidium parvum sporozoites. Because of the wide host range of PrV, it has the possibility as the vector to delivery the foreign genes to several species of animals containing experiment animal. In the recombinant constructed in this study, the p23 gene under the control of CAG promoter was integrated into the thymidine kinase (TK) gene of PRV. Antibody against p23 recognized p23 expressed in CPK cells infected with the recombinant, as the approximate 23 kDa specific band in Western blotting analysis. This study showed the...
Palavras-chave: Cryptosporidium parvum; P23; Herpes; Pseudorabies virus; Subunit vaccine.
Ano: 2000
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/129

Expression Patterns of the Implantation-associated Genes in the Uterus during the Estrous Cycle in Mice
Provedor de dados: 19
Autores: LEE, Dong-Soo; YANAGIMOTO UETA, Yoshiko; XUAN, Xuenan; IGARASHI, Ikuo; FUJISAKI, Kozo; SUGIMOTO, Chihiro; TOYODA, Yutaka; SUZUKI, Hiroshi; 玄, 学南; 五十嵐, 郁男; 鈴木, 宏志.
The mRNA expression patterns of EGF, HB-EGF, Amphiregulin, EGF receptor, IGF-1, CSF-1, IL-1 alpha, IL-1 beta, IL-1 receptor type 1, IL-1 receptor antagonist, LIF, COX-1, COX-2, Mucin-1, calcitonin, and rat USAG-1 mouse homologue, all of which are involved in the process of conceptus implantation to the endometrium, were examined during the estrous cycle by means of real-time quantitative PCR. COX-2, HB-EGF, LIF, Mucin-1, CSF-1, IL-1 alpha, IL-1 beta, and IL-1 receptor antagonist were temporally regulated during the estrous cycle and highly expressed during the estrous stage. In the case of COX-1, EGF, IGF-1, and EGF receptor, the highest mRNA expression was during the diestrous stage. In contrast, the rat USAG-1 mouse homologue mRNA expression did not...
Palavras-chave: Estrous cycle; Implantation; Mice; Ovarian hormone.
Ano: 2005
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3022

PCR Detection and Genetic Diversity of Bovine Hemoprotozoan Parasites in Vietnam
Provedor de dados: 19
Autores: SIVAKUMAR, Thillaiampalam; LAN, Dinh Thi Bich; LONG, Phung Thang; YOSHINARI, Takeshi; TATTIYAPONG, Muncharee; GUSWANTO, Azirwan; OKUBO, Kazuhiro; IGARASHI, Ikuo; INOUE, Noboru; XUAN, Xuenan; YOKOYAMA, Naoaki; 井上, 昇; 玄, 学南; 横山, 直明.
Hemoprotozoan infections often cause serious production losses in livestock. In the present study, we conducted a PCR-based survey of Babesia bovis, Babesia bigemina, Theileria annulata, Theileria orientalis, Trypanosoma evansi and Trypanosoma theileri, using 423 DNA samples extracted from blood samples of cattle (n=202), water buffaloes (n=43), sheep (n=51) and goats (n=127) bred in the Hue and Hanoi provinces of Vietnam. With the exception of T. annulata and T. evansi, all other parasite species (B. bovis, B. bigemina, T. orientalis and T. theileri) were detected in the cattle populations with B. bovis being the most common among them. Additionally, four water buffaloes and a single goat were infected with B. bovis and B. bigemina, respectively. The Hue...
Palavras-chave: Epidemiology; Hemoprotozoa; Livestock; PCR; Vietnam.
Ano: 2013
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4015

Babesia gibsoni internal transcribed spacer 1 region is highly conserved amongst isolates from dogs across Japan
Provedor de dados: 19
Autores: LIU, Mingming; CAO, Shinuo; VUDRIKO, Patrick; SUZUKI, Hiroshi; SOMA, Takehisa; XUAN, Xuenan; 鈴木, 宏志; 玄, 学南.
Babesia gibsoni is a tick-borne apicomplexan parasite of dogs that often causes fever and hemolytic anemia with highly variable clinical outcome. In this study, we sequenced the 254bp Internal Transcribed Spacer 1 region (ITS1) of 54 B. gibsoni isolates from 14 different geographical regions of Japan. The 54 isolates shared high sequence identity with each other and with B. gibsoni isolates reported in GenBank database (97.2–100%). Consistent with previous reports, phylogenetic analysis showed that B. gibsoni isolates from Japan formed the same clade with those from U.S.A., Australia, India and Taiwan. Our finding indicates that B. gibsoni ITS1 region is highly conserved among isolates from dogs in Japan, making it a useful genetic marker for molecular...
Palavras-chave: Babesia gibsoni; Conserved gene; Internal transcribed spacer 1 (ITS1); Japan.
Ano: 2016
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4302

Exposure of C57BL/6J Male Mice to an Electric Field Improves Copulation Rates with Superovulated Females
Provedor de dados: 19
Autores: HORI, Takuya; YAMSAARD, Thicomeporn; UETA, Yoshiko Yanagimoto; HARAKAWA, Shinji; KANEKO, Etsushi; MIYAMOTO, Akio; XUAN, Xuenan; TOYODA, Yutaka; SUZUKI, Hiroshi; 宮本, 明夫; 玄, 学南; 鈴木, 宏志.
It is well-known that there are considerable strain differences in the relative copulation rates between male and superovulated female mice. In particular, the C57BL/6J strain of mice has a lower rate of successful copulation. We examined the effect of exposure to an electric field on sexual behavior in C57BL/6J male mice. When C57BL/6J males were exposed to a 50 Hz, 45 kV/m electric field for 30 min per day for 11 days and placed in a cage with a superovulated female of the same strain, the successful copulation rates of males was significantly improved compared with unexposed males (P&lt;0.05). These results suggest that the exposure of C57BL/6J male mice to an electric field improves their sub-fertility activity in mating with superovulated females.
Palavras-chave: Mice; Male; Electric field; Copulation; Superovulation; Sexual behavior.
Ano: 2005
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3021

Starfish, Asterias amurensis and Asterina pectinifera, as Potential Sources of Th1 Immunity-Stimulating Adjuvants
Provedor de dados: 19
Autores: KAWASE, Osamu; GOO, Youn-Kyoung; JUJO, Hayato; NISHIKAWA, Yoshifumi; XUAN, Xuenan; 西川, 義文; 玄, 学南.
Saponin is the generic name of steroid or triterpene glycosides, and the capacities of some saponins to stimulate both Th1 immune response and production of cytotoxic T cells are useful as vaccine components against intracellular pathogens. Because saponins have been found commonly in starfish, we assessed the potential of starfish, Asterias amurensis and Asterina pectinifera, as adjuvant sources. Crude starfish saponins had hemolytic activities (EC50=10 to 100 μg/ml) and thin layer chromatography indicated heterogeneity of their constituents. When starfish saponis were subcutaneously injected into mice with ovalbumin (OVA), OVA-specific IgG, especially IgG2a instead of IgG1 was produced in mouse blood, suggesting starfish saponins stimulated Th1 type...
Palavras-chave: Adjuvant; Saponin; Starfish; Th1 immunity; Vaccine.
Ano: 2011
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3587

Babesia bovis Dihydroorotate Dehydrogenase (BboDHODH) is a Novel Molecular Target of Drug for Bovine Babesiosis
Provedor de dados: 19
Autores: KAMYINGKIRD, Ketsarin; CAO, Shinuo; MASATANI, Tatsunori; MOUMOUNI, Paul Franck Adjou; VUDRIKO, Patrick; MOUSA, Ahmed Abd El Moniem; TERKAWI, Mohamad Alaa; NISHIKAWA, Yoshifumi; IGARASHI, Ikuo; XUAN, Xuenan; 西川, 義文; 五十嵐, 郁男; 玄, 学南.
The emergence of drug resistance and adverse side effects of current bovine babesiosis treatment suggest that the search of new drug targets and development of safer and effective compounds are required. This study focuses on dihydroorotate dehydrogenase (DHODH), the fourth enzyme of pyrimidine biosynthesis pathway as a potential drug target for bovine babesiosis. Recombinant Babesia bovis DHODH protein (rBboDHODH) was produced in Escherichia coli and used for characterization and measurement of enzymatic activity. Furthermore, the effects of DHODH inhibitors were evaluated in vitro. The recombinant B. bovis DHODH histidine fusion protein (rBboDHODH) had 42.4-kDa molecular weight and exhibited a specific activity of 475.7 ± 245 Unit/mg, a Km = 276.2 µM for...
Palavras-chave: Atovaquone; Babesia bovis; Chemotherapeutic target agent; Dihydroorotate dehydrogenase; Leflunomide.
Ano: 2014
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3918

The Influence of the regulation of Toxoplasma gondii TgMIC2 transgene on host cell infection
Provedor de dados: 19
Autores: 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 &lt; 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...
Palavras-chave: Toxoplasma gondii; TgMIC2; Over-expression.
Ano: 2008
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2236