Consulta: creatorFacets:"NISHIKAWA, Yoshifumi"
Registros recuperados: 10
Data/hora: 03/06/2024 07:47:46

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

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

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

Seroprevalence of antibody to NcSAG1 antigen of Neospora caninum in cattle from Western Java, Indonesia
Provedor de dados: 19
Autores: ICHIKAWA-SEKI, Madoka; GUSWANTO, Azirwan; ALLAMANDA, Puttik; MARIAMAH, Euis Siti; WIBOWO, Putut Eko; NISHIKAWA, Yoshifumi.
Neospora caninum can cause fetal abortion and neonatal mortality in cattle, and is a cause of economic concern worldwide. This study aimed to determine the prevalence of Neospora caninum-specific antibodies in cattle from Western Java, Indonesia. Serum samples from 991 cattle from 21 locations were tested for antibodies to N. caninum by using an enzyme-linked immunosorbent assay (ELISA) on the basis of recombinant NcSAG1. The overall seroprevalence was 16.6%, ranging from 0 to 87.5% in the sampled locations. The results of this study indicate latent infection rates of sampled animals were different in each location. Further studies are necessary to elucidate the relationship between N. caninum infection and abortion in cattle, and to identify risk factors...
Palavras-chave: Cattle; ELISA; Indonesia; NcSAG1; Neospora caninum.
Ano: 2016
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4250

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

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

Zygomycotic Mediastinal Lymphadenitis in Beef Cattle with Ruminal Tympany
Provedor de dados: 19
Autores: NISHIMURA, Maki; TOYOTA, Yumi; ISHIDA, Yoshikazu; NAKAYA, Hideki; KAMEYAMA, Kyohko; NISHIKAWA, Yoshifumi; MIYAHARA, Kazuro; INOKUMA, Hisashi; FURUOKA, Hidefumi; 西川, 義文; 猪熊, 壽; 古岡, 秀文.
A 9-month-old steer was autopsied due to recurrent ruminal tympany. A macroscopic examination found an enlarged caudal mediastinal lymph node, and a section of the lymph node revealed necrosis with marked calcification, similar to tuberculous lymphadenitis. Histopathologically, the lesion consisted of multiple coagulative necrotic foci and fibrosis with macrophage, lymphocyte, eosinophil and multinucleated giant cell infiltration. Non-uniform width hyphae were detected in the necrotic area and within the cytoplasm of the multinucleated giant cells, and they were found to be anti-Rhizopus arrhizus antibody positive in an immunohistochemical examination. Therefore, the steer was diagnosed with necrotic caudal mediastinal lymphadenitis due to zygomycetes...
Palavras-chave: Cattle; Necrotic lymphadenitis; Ruminal tympany; Zygomycosis.
Ano: 2014
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3943

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

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