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Artesunate, a potential drug for treatment of Babesia infection OAK
Goo, Youn-Kyoung; Terkawi, M. Alaa; Jia, Honglin; Aboge, G. Oluga; Ooka, Hideo; Kim, Suk; Igarashi, Ikuo; Nishikawa, Yoshifumi; Xuan, Xuenan.
The effect of artesunate, a water-soluble artemisinin derivative, against Babesia species, such as Babesia bovis, Babesia gibsoni, and Babesia microti was studied. Cultures of B. bovis and B. gibsoni were treated with 0.26 μM, 2.6 μM, 26 μM, and 260 μM artesunate, and the growth-inhibitory effect was shown in over 2.6 μM artesunate in day 4 and day 3 post-subculture for B. bovis and B. gibsoni, respectively, in dose-dependent manner. In vivo experiment for B. microti, strong inhibition effects were observed in mouse groups treated with over 1.0 mg/kg body weight of artesunate on day 9 and 10 post-infection. These results suggest that artesunate could be a potential drug for Babesia infection.
Palavras-chave: Artesunate; Babesia bovis; Babesia gibsoni; Babesia microti.
Ano: 2010 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2820
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Babesia gibsoni: An apical membrane antigen-1 homologue and its antibody response in the infected dogs OAK
Zhou, Jinlin; Yang, Jun; Zhang, Guohong; Nishikawa, Yoshifumi; Fujisaki, Kozo; Xuan, Xuenan.
A cDNA encoding the apical membrane antigen-1 (AMA-1) homologue was obtained by immunoscreening a cDNA expression library prepared from Babesia gibsoni merozoite mRNA. The complete nucleotide sequence of the gene was 2062 bp. Computer analysis suggested that the sequence contains an open reading frame of 1794 bp with a coding capacity of approximately 66 kDa. Based on the homology analysis, this putative protein was designated as B. gibsoni AMA-1 (BgAMA-1). The BgAMA-1 gene was expressed in the Escherichia coli BL21 strain and used as the antigen in Western blotting and the enzyme-linked immunosorbent assay (ELISA). The results indicated that BgAMA-1 was recognized as an immunodominant antigen by the host immune system and that it induced a strong antibody...
Palavras-chave: Babesia gibsoni; AMA-1; Antibody response.
Ano: 2006 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/815
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Babesia gibsoni Infections in Dogs OAK
Yamane, Itsuro; Conrad, Patricia A.; Gardner, Ian.
Palavras-chave: Babesia gibsoni; Canine; Dogs; Anemia; Babesiosis.
Ano: 1993 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/194
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Babesia gibsoni internal transcribed spacer 1 region is highly conserved amongst isolates from dogs across Japan OAK
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
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Babesia gibsoni rhoptry-associated protein 1 and its potential use as a diagnostic antigen OAK
Zhou, Jinlin; Jia, Honglin; Nishikawa, Yoshifumi; Fujisaki, Kozo; Xuan, Xuenan.
A cDNA encoding the rhoptry-associated protein 1 (RAP-1) homologue was obtained by immunoscreening an expression library prepared from Babesia gibsoni merozoite mRNA. The complete nucleotide sequence of the gene was 1740bp. Computer analysis suggested that the sequence contains an open reading frame of 1425bp encoding an expected protein with a molecular weight of 52kDa. Based on the sequence similarity, this putative protein was designated as the B. gibsoni RAP-1 (BgRAP-1). The BgRAP-1 gene was expressed in the Escherichia coli BL21 strain, and the recombinant BgRAP-1 was used as the antigen in the enzyme-linked immunosorbent assay (ELISA). The results can differentiate between the B. gibsoni-infected dog sera and the Babesia canis infected dog sera or...
Palavras-chave: Babesia gibsoni; Rhoptry-associated protein; Enzyme-linked immunosorbent assay; Diagnosis.
Ano: 2007 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/811
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Clinical usefulness of antibodies against Babesia gibsoni detected by ELISA with recombinant P50 OAK
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
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Cloning and Characterization of a 2-Cys Peroxiredoxin from Babesia gibsoni OAK
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
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CLONING AND EXPRESSION OF AN ANTIGEN OF BABESIA GIBSONI IN ESCHERICHIA COLI AND ITS USE FOR THE IMMUNODIAGNOSIS OF CANINE BABESIOSIS OAK
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
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Developmental Stages of Protozoan Piroplasma Species Endemic in Japan OAK
Higuchi, Seiichi.
Palavras-chave: Theileria sergenti; Babesia ovata; Babesia gibsoni; Haemaphysalis longicornis; Life cycle.
Ano: 1993 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/178
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Epidemiological survey of Babesia gibsoni infection in dogs in eastern Japan OAK
Miyama, Takako; Sakata, Yoshimi; Shimada, Yojiro; Ogino, Shoji; Watanabe, Malaika; Itamoto, Kazuhito; Okuda, Masaru; Verdida, Rodolfo A.; Xuan, Xuenan; Nagasawa, Hideyuki; Inokuma, Hisashi.
To determine the distribution of Babesia gibsoni infection in dogs in the eastern part of Japan, an epidemiological survey of dogs suspected of having B. gibsoni infection was attempted using the polymerase chain reaction (PCR) and enzyme-linked immunosorbent assay (ELISA). Thirty-five of 115 such dogs (30.4%) were positive by PCR and/or ELISA. The 35 positive dogs consisted of 28 Tosa dogs, 4 American Pit Bull Terriers, and 3 mongrel dogs in Aomori, Fukushima, Ibaraki, Gunma, Chiba, Tokyo, Kanagawa, and Nagano Prefectures. The positive dogs had a significantly lower rate of tick exposure and a higher rate of bites by other dogs. Twenty-two of 35 B. gibsoni-positive dogs were infected with hemoplasma, and the rate of infection was significantly higher than...
Palavras-chave: Babesia gibsoni; Eastern Japan; Enzyme-linked immunosorbent assay; Hemoplasma; Polymerase chain reaction.
Ano: 2005 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/924
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Expression of Babesia gibsoni thrombospondin-related adhesive protein in Toxoplasma gondii and evaluation of its antigenicity and immunogenicity OAK
Kumagai, A.; Zhang, G.; Jia, H.; Nakamura, C.; Zhang, H.; Goo, Y-K.; Aboge, G. A.; Terkawi, M. A.; Zhou, J.; Nishikawa, Y.; Xuan, X..
A gene encoding Babesia gibsoni thrombospondin-related adhesive protein (BgTRAP), known as a vaccine candidate, was stably expressed in Toxoplasma gondii (Tg/BgTRAP). The molecular weight and the antigenic reaction of recombinant BgTRAP expressed by the Tg/BgTRAP were similar to the original ones expressed by B. gibsoni. To evaluate the antigenicity of the recombinant BgTRAP expressed by T. gondii, the lysates of the recombinant parasite tachyzoites were intraperitoneally injected into mice. The serum collected from Tg/BgTRAP-immunized mouse could react to B. gibsoni parasites, while the serum collected from wild-type T. gondii tachyzoites (Tg/wt)-immunized mice did not. These results indicate that T. gondii could provide a new tool to produce foreign...
Palavras-chave: Toxoplasma gondii; Babesia gibsoni; BgTRAP; Expression; Vaccine.
Ano: 2016 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4496
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Expression of truncated Babesia gibsoni thrombospondin-related adhesive proteins in Escherichia coli and evaluation of their diagnostic potential by enzyme-linked immunosorbent assay OAK
Sandagdorj, Narantsatsral; Goo, Youn-Kyoung; Terkawi, Mohamad Alaa; Soma, Takehisa; Luo, Yuzi; Li, Yan; Cao, Shinuo; Aboge, Gabriel Oluga; Nishikawa, Yoshifumi; Badgar, Battsetseg; Xuan, Xuenan.
Among the previously established enzyme-linked immunosorbent assays (ELISAs), an ELISA using the full length of recombinant thrombospondin-related adhesive protein of Babesia gibsoni (rBgTRAPf) is considered as the most sensitive diagnostic method for the detection of antibody to B. gibsoni in dogs. However, the expression of rBgTRAPf in high concentration is poor and thus limits its usefulness as diagnostic antigen. To improve its expression level, we have truncated BgTRAPf into two fragments having either N- or C-terminus (BgTRAPn or BgTRAPc). The expression of BgTRAPc protein in Escherichia coli yielded adequate recombinant protein. The specificity and sensitivity of ELISAs with the truncated proteins were determined using B. gibsoni-experimentally...
Palavras-chave: Babesia gibsoni; Diagnosis; Enzyme-linked immunosorbent assay (ELISA); Thrombospondin-related adhesive protein (TRAP).
Ano: 2011 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3115
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Identification of a novel B. gibsoni 27-kDa protein as a serodiagnostic antigen OAK
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
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Identification of a novel gene encoding a secreted antigen 1 of Babesia gibsoni and evaluation of its use in serodiagnosis OAK
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
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Identification of an immunodominant Babesia gibsoni 47-kDa antigen OAK
Goo, Jia Y-K; Aboge, G. O; Terkawi, M. A; Yamagishi, J; Nishikawa, Y; Igarashi, I; Xuan, X.
Palavras-chave: Babesia gibsoni; Dog; An immunodominant antigen.
Ano: 2009 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2499
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Invasion of Babesia gibsoni into Mouse Erythrocytes OAK
Morita, Tatsushi; Asano, Kayo; Saeki, Hideharu; Imai, Soichi; Ishii, Toshio.
Palavras-chave: Babesia gibsoni; Host specificity; Histochemistory; SCID mouse.
Ano: 1995 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/233
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Molecular Survey of Babesia gibsoni Using Haemaphysalis longicornis Collected from Dogs and Cats in Japan OAK
IWAKAMI, Shinya; ICHIKAWA, Yasuaki; INOKUMA, Hisashi; 猪熊, 壽.
A nationwide survey of Babesia gibsoni using Haemaphysalis longicornis collected from dogs and cats in Japan was conducted using molecular methods. A total of 1,341 H. longicornis, including 305 females, 14 males, 332 nymphs and 690 larvae (153 pools) from 44 prefectures, were examined by B. gibsoni-targeted PCR. Partial sequence analysis revealed that 12 of 13 positive samples sequenced, including samples from Tottori, Hiroshima, Yamaguchi, Tokushima, Ehime and Oita prefectures (all in western Japan), were identical to B. gibsoni, and 1 sample from Kyoto Prefecture was most closely related to a Babesia species recently detected from feral raccoons in Hokkaido. H. longicornis is a candidate for transmission vector tick of the new Babesia species.
Palavras-chave: Babesia gibsoni; Distribution Haemaphysalis longicornis.
Ano: 2014 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4013
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The epidemiological survey for atovaquone resistant related gene of Babesia gibsoni in Japan OAK
Iguchi, Aiko; Soma, Takehisa; Suzuki, Hiroshi; Xuan, Xuenan.
In 73 gDNA samples from Babesia gibsoni-infected dogs, the M121I variant population was measured by using allele-specific real-time PCR. Although the mechanism of atovaquone against B. gibsoni has not been clearly identified, it is reported that the mitochondria cytochrome b gene of the atovaquone-resistant B. gibsoni had a single-nucleotide substitution at nt363 (G to T), which resulted in the substitution of methionine with isoleucine (M121I). In this study, 3/73 samples showed over 5% M121I variant population. Although the M121I variant population is a low percentage, it runs the risk of spreading drug-resistant parasites. It is important to prevent the spread of drug-resistance, so we need to gather information about this at regular intervals.
Palavras-chave: Allele-specific real-time PCR; Babesia gibsoni; Drug resistance; M121I variant population.
Ano: 2016 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4421
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犬 Babesia gibsoni 感染症の発生状況に関する全国アンケート調査 OAK
猪熊, 壽; 田井, 貴子; 市川, 康明; INOKUMA, Hisashi; TAI, Takako; ICHIKAWA, Yasuaki.
全国47都道府県の小動物診療施設を対象に2009年(09年)と2010年(10年)の犬Babesia gibsoni感染症発生状況に関するアンケート調査を実施した.9,513施設か6,746 の回答が得られ(回収率70.9 %),うち859施設(12.7 %)が本症を経験していた.確定症例数は09年3,802,10年3,625で,うち東日本では09年87,10年75であった.栃木,茨城,群馬,埼玉,東京,長野の関東以北6都県では,西日本への移動又は旅行歴のない,闘犬以外の品種9頭に確定症例が認められ,関東以北でのB. gibsoni自然感染が示唆された.西日本では769 施設で09年3,715,10年3,550の確定症例があり,特に香川,熊本,徳島,山口,福岡,宮崎,兵庫各県で,年間200を超える症例が報告された. A nationwide questionnaire was conducted on the prevalence of the Babesia gibsoni infection in dogs in 2009 and 2010. The questionnaire was sent to 9,513 animal hospitals in all 47 prefectures, and 6,746 answers (70.9%) were received. Among the respondents, 859 animal hospitals (12.7%) have diagnosed B. gibsoni infection in dogs. The numbers of patients were 3,802 and 3,625 in 2009 and 2010,...
Palavras-chave: Babesia gibsoni; ; 日本; アンケート調査; 発生状況; Dogs; Japan; Questionnaire; Surveillance.
Ano: 2012 URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3556
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