|
|
|
| Registros recuperados: 39 | |
|
|
| TAGAWA, Michihito; TAKEUCHI, Toshihiko; FUJISAWA, Tetsuro; KONNO, Yasuhiro; YAMAMOTO, Shinji; MATSUMOTO, Kotaro; YOKOYAMA, Naoaki; INOKUMA, Hisashi; 松本, 高太郎; 横山, 直明; 猪熊, 壽. |
| A 2-year-old East Friesian sheep imported from Australia exhibited severe anemia after contagious pustular dermatitis in Hokkaido, Japan. Hemoplasma infection was confirmed in blood smears. Both Mycoplasma ovis and ‘Candidatus Mycoplasma haemovis’ were detected by PCR and sequence analyses. In the epidemiological analysis, dual pathogens were detected in 6 of 12 (50.0%) sheep imported from Australia with the infected ewe at the same time, 1 of 5 (20.0%) sheep introduced from a domestic farm in Hokkaido, and in 1 of 16 (6.3%) sheep from an epidemiologically unrelated ranch. It is the first clinical case of sheep to confirm coinfection of these pathogens in Japan. |
|
Palavras-chave: 'Candidatus Mycoplasma haemovis'; Case report; Japan; Mycoplasma ovis; Sheep. |
| Ano: 2012 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3582 |
| |
|
|
| SIVAKUMAR, Thillaiampalam; ASADA, Masahito; BATTSETSEG, Badgar; HUANG, Xiaohong; LAN, Dinh Thi Bich; INPANKAEW, Tawin; P. YBAÑEZ, Adrian; ALHASSAN, Andy; THEKISOE, Oriel M. M.; DE MACEDO, Alan Caine Costa; INOKUMA, Hisashi; IGARASHI, Ikuo; YOKOYAMA, Naoaki; 猪熊, 壽; 五十嵐, 郁男; 横山, 直明. |
| Babesia ovata is a tick-transmitted hemoprotozoan parasite that infects cattle. In our study, bovine blood samples (n=2,034) were collected from 10 different countries (Brazil, China, Ghana, Japan, Mongolia, the Philippines, South Africa, Sri Lanka, Thailand and Vietnam) and DNA extracted. The DNA samples were screened using an established and specific polymerase chain reaction (PCR) assay targeting the Apical membrane antigen 1 (AMA-1) gene. Parasite DNA was detected among samples collected from Japan, Mongolia and Thailand. Sequence analyses confirmed that the PCR assay detected only B. ovata AMA-1, and that amplicons from different geographical locations were conserved. Our findings highlight the importance of designing adequate strategies to control B.... |
|
Palavras-chave: AMA-1; Babesia ovata; Cattle; Mongolia; Thailand. |
| Ano: 2013 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4016 |
| |
|
|
| Kuboki, Noritaka; Yokoyama, Naoaki; Namangala, B; Okamura, Masashi; Inoue, Noboru; Takagi, Hideaki; Nakayama, Tomoko; Nishikawa, Yoshifumi; Ikehara, Yuzuru; Kojima, Naoya; 横山, 直明; 井上, 昇; 西川, 義文. |
|
Palavras-chave: Adjuvant; African trypanosome; Immunization; Oligomannose-coated liposome(OML). |
| Ano: 2008 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2222 |
| |
|
|
| Okamura, Masashi; Yokoyama, Naoaki; Takabatake, Noriyuki; Okubo, Kazuhiro; Ikehara, Yuzuru; Igarashi, Ikuo; 横山, 直明; 五十嵐, 郁男. |
| In the present study, the subcellular localization of the host red blood cell (RBC) membrane components, the alpha 2-3-linked sialic acid (SA) residues and the lipid bilayer, was observed during the asexual growth of Babesia bovis using two erythrocyte probes, the SA-specific lectin (MALII) and the lipophilic fluorescent (PKH2) probes, respectively. In confocal laser scanning microscopy with MALII, the SA residues on the surface of parasitized RBCs appeared to accumulate into the intracellular parasites as the parasites matured as well as to remain on the surface of extracellular parasites. Furthermore, when PKH2-labeled RBCs were infected with B. bovis, PKH2 signals were also observed around both the intracellular and the extracellular parasites,... |
|
Palavras-chave: Babesia bovis (B. bouis); SA; MALII; RBC; RT; PBS; Babesia equi (B. equi); PV. |
| Ano: 2007 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/1040 |
| |
|
|
| MOSSAAD, Ehab; ASADA, Masahito; NAKATANI, Daichi; INOUE, Noboru; YOKOYAMA1), Naoaki; KANEKO, Osamu; KAWAZU, Shin-ichiro; 井上, 昇; 横山, 直明; 河津, 信一郎. |
| Bovine babesiosis is a livestock disease known to cause economic losses in endemic areas. The apicomplexan parasite Babesia bovis is able to invade and destroy the host’s erythrocytes leading to the serious pathologies of the disease, such as anemia and hemoglobinuria. Understanding the egress mechanisms of this parasite is therefore a key step to develop new therapeutic strategies. In this study, the possible involvement of Ca2+ in the egress of B. bovis merozoites from infected erythrocytes was investigated. Egress was artificially induced in vitro using calcium ionophore A23187 and thapsigargin to increase Ca2+ concentration in the cytosol of the parasite cells. The increased intracellular Ca2+ concentration following these treatments was confirmed... |
|
Palavras-chave: Babesia bovis; Calcium ionophore; Calcium signalling; Egress. |
| Ano: 2015 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4071 |
| |
|
|
| 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 |
| |
|
| |
|
|
| YBAÑEZ, Adrian Patalinghug; MATSUMOTO, Kotaro; KISHIMOTO, Toshio; YOKOYAMA, Naoaki; INOKUMA, Hisashi; 松本, 高太郎; 横山, 直明; 猪熊, 壽. |
| Anaplasma phagocytophilum causes human granulocytic anaplasmosis (HGA) and tick-borne fever in ruminants. A closely related and potentially novel Anaplasma sp. in Japan was recently characterized. The aims of the study were to provide molecular evidence for the presence of these 2 species in Japan, and to develop a reliable PCR method based on the nucleotide differences within the citrate synthase (gltA) gene. DNA samples from 182 ixodid ticks (134 Ixodes persulcatus, 35 Haemaphysalis douglasii and 13 I. ovatus) collected from 2 sites in Hokkaido, Japan, were screened for A. phagocytophilum and its closely related Anaplasma sp. (herein designated as Anaplasma sp. Japan) using 16S rRNA PCR, revealing a combined prevalence rate of 27.5% (50 samples). The... |
|
Palavras-chave: 16S rRNA; Anaplasma phagocytophilum; Anaplasma sp.; GltA; GroEL. |
| Ano: 2012 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3839 |
| |
|
|
| Ishigame, T; Takabatake, N; Iseki, H; Ota, N; Koyama, A; Igarashi, I; Nishikawa, Y; Ikehara, Y; Kojima, N; Yokoyama, N; 五十嵐, 郁男; 西川, 義文; 横山, 直明. |
| Oligomannose-coated liposome (OML)-based vaccines have been reported to induce Th1-based immunity against entrapped antigens in immunized animals and to show protective effects against several protozoal diseases. In the present study, we produced a recombinant Babesia rodhaini ribosomal phosphoprotein P0 (rBrP0) that showed immunological cross reactivity with another rodent Babesia parasite, B. microti. We evaluated the efficacy of vaccination with OML-entrapped rBrP0 on B. rodhaini and B. microti infections in mice. Prior immunization with the OML-based rBrP0 vaccine, or with a Freund’s adjuvant-based rBrP0 vaccine, failed to demonstrate any protective effect against lethal infection with B. rodhaini, but the OML-based vaccine did induce protective... |
|
Palavras-chave: Oligomannose-coated liposomes (OML); Vaccine; Babesiosis; Babesia rodhaini; Babesia microti; P0. |
| Ano: 2009 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2383 |
| |
|
|
| Tuvshintulga, B.; Sivakumar, T.; Salama, A.A.; Yokoyama, N.; Igarashi, I; 五十嵐, 郁男; 横山, 直明. |
| Methylene blue, the first fully synthetic drug, has been widely used in medical treatments. A few decades ago, this drug was used as an antimalarial agent. In this study, the in vitro inhibitory effect of methylene blue on Babesia bovis, B. bigemina, B. caballi, and Theileria equi (B. equi) and the in vivo inhibitory effect on B. microti were evaluated. Methylene blue significantly inhibited the growth of B. bovis, B. caballi, and T. equi at a 0.1 μM concentration, while B. bigemina was significantly inhibited at 0.01 μM, on day 3 of cultivation. The half maximal inhibitory concentrations (IC50) of methylene blue against B. bovis, B. bigemina, B. caballi, and T. equi were calculated as 0.83±0.02, 0.68±0.09, 0.54±0.14, and 0.49±0.06 μM, respectively. The... |
|
Palavras-chave: Methylene blue; Babesia; Theileria; In vitro; In vivo. |
| Ano: 2015 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4242 |
| |
|
|
| Tuvshintulga, B.; Battsetseg, B.; Battur, B.; Myagmarsuren, P.; Narantsatsral, S.; Sivakumar, T.; Takemae, H.; Igarashi, I.; Inoue, N.; Yokoyama, N.; 五十嵐, 郁男; 井上, 昇; 横山, 直明. |
| Babesia venatorum, formerly known as Babesia sp. EU1, is a zoonotic hemoprotozoan parasites that commonly infects deer. In the present study, we investigated B. venatorum infection in Ixodes persulcatus, an important tick vector capable of transmitting several tick-borne pathogens that cause babesiosis, encephalitis, tularemia, and Lyme diseases. DNA samples extracted from questing I. persulcatus ticks (n=63) that had been collected in Selenge province of Mongolia in 2012 and 2013 were screened for B. venatorum using a nested PCR assay. The findings showed that two of 63 DNA samples were positive for B. venatorum. The 18S rRNA sequences amplified from B. venatorum-positive DNA samples shared high identity scores (96.1–99.9%) with known B. venatorum... |
|
Palavras-chave: Babesia venatorum; 18S rRNA; Ixodes persulcatus; Mongolia. |
| Ano: 2015 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/4243 |
| |
|
|
| YBAÑEZ, Adrian Patalinghug; SIVAKUMAR, Thillaiampalam; YBAÑEZ, Rochelle Haidee Daclan; RATILLA, Jowarren Catingan; PEREZ, Zandro Obligado; GABOTERO, Shirleny Reyes; HAKIMI, Hassan; KAWAZU, Shin-ichiro; MATSUMOTO, Kotaro; YOKOYAMA, Naoaki; INOKUMA, Hisashi; 河津, 信一郎; 松本, 高太郎; 横山, 直明; 猪熊, 壽. |
| Anaplasma marginale has been detected in the Philippines only by peripheral blood smear examination and serological methods. This study generally aimed to molecularly detect and characterize A. marginale in cattle and ticks in Cebu, Philippines. A total of 12 bovine blood samples and 60 Rhipicephalus (Boophilus) microplus ticks were collected on the Cebu Island in 2011. 16S rRNA-based screening-PCR and DNA sequencing revealed 8 cattle (66.7%) and 8 ticks (13.3%) to be positive for A. marginale, and 1 tick (1.7%) to be positive for A. centrale. Selected positive DNA samples were further characterized based on 16S rRNA (longer sequence), Msp5, Msp1α,gltA and groEL genes for phylogenetic analyses. Sequence identities of partial DNA fragments of A. marginale... |
|
Palavras-chave: Anaplasma marginale; Cattle; PCR; Philippines; Rhipicephalus (Boophilus) microplus. |
| Ano: 2013 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3866 |
| |
|
| |
|
|
| YOKOYAMA, Naoaki; UENO, Akio; MIZUNO, Daisuke; KUBOKI, Noritaka; KHUKHUU, Altangerel; IGARASHI, Ikuo; MIYAHARA, Tokuji; SHIRAISHI, Takashi; KUDO, Ryuta; OSHIRO, Mamoru; ZAKIMI, Satoshi; SUGIMOTO, Chihiro; MATSUMOTO, Kotaro; INOKUMA, Hisashi; 横山, 直明; 五十嵐, 郁男; 松本, 高太郎; 猪熊, 壽. |
| Theileria orientalis is a benign protozoan species that is widely distributed in Japan, yet sometimes causes serious economic losses in the livestock industry. In this study, we conducted a molecular survey based on genes encoding the major piroplasm surface protein (MPSP) and p23 for T. orientalis detected in cattle grazing in southern areas of Japan, consisting of 2 farms in Kumamoto prefecture (Aso and Kuma districts) and 3 farms in Okinawa prefecture (Ishigaki, Iriomote, and Yonaguni Islands). High prevalence rates of T. orientalis infection were shown in all the cattle populations using the diagnostic MPSP- and p23-PCR assays. Phylogenetic analyses revealed 4 MPSP genotypes and 3 p23 genotypes. Furthermore, MPSP genotype-specific PCR methods were... |
|
Palavras-chave: Cattle; Genotype-specific PCR; Japan; MPSP gene; Theileria orientalis. |
| Ano: 2011 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3584 |
| |
|
| |
|
| |
|
|
| Bork, Sabine; Yokoyama, Naoaki; Okamura, Masashi; Igarashi, Ikuo; 横山, 直明; 五十嵐, 郁男. |
| Recently，we reported the in vitro growth inhibitory effects of the imidazole derivatives，clotrimazole(CLT) and ketoconazole (KC)，and the herbicide，clodinafop-propargyl(CP)，against bovine and equine Babesia parasites. Additionally，in the bovine species，several combined applications of the CLT，KC，and CP were reported to significantly increase the inhibitory effects. In this study，similar combination tests were carried out in order to confirm possible synergistic effects in the equine species，Babesia caballi and Babesia equi. Combinations of CLT/KC， CLT/CP，and CLT/KC/CP exerted a significantly enhanced growth inhibitory efficacy in B. caballi，in contrast to B. equi，where no synergistic effects were observed in any of the combinations. Our results suggest that... |
|
Palavras-chave: In vitro; Babesia; Clotrimazole; Ketoconazole; Clodinafop-propargyl. |
| Ano: 2003 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/637 |
| |
|
|
| Sivakumar, T; Aboulaila, M. R. A.; Khukhuu, A; Iseki, H; Alhassan, A; Yokoyama, Naoaki; Igarashi, Ikuo; 横山, 直明; 五十嵐, 郁男. |
| The in vitro inhibitory effect of fosmidomycin was evaluated against the asexual growth of bovine Babesia parasites (Babesia bovis and Babesia bigemina). In the cultures with these parasites, severe reduction of parasite growth was observed by the addition of 1.25 μg/ml of the final drug concentration. Under these conditions, B. bigemina was completely cleared until the third day of cultivation. On the other hand, B. bovis was completely eliminated on the fourth day when the concentration was 6.25 μg/ml in the culture. These parasites failed to grow again when a drug-free medium was substituted for the subsequent cultivation. The IC50 values of fosmidomycin against B. bovis were determined as 0.88 and 0.63 μg/ml in the in vitro cultures with... |
|
Palavras-chave: Fosmidomycin; Babesia bovis; Babesia bigemina; Asexual growth; In vitro culture. |
| Ano: 2008 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2235 |
| |
|
|
| Munkhjargal, T; Aboulaila, M.R.A; Sivakumar, T; Yokoyama, N; Igarashi, I; 横山, 直明; 五十嵐, 郁男. |
| Apicidin, a histone deacetylase inhibitor, has a broad spectrum of anti-protozoal activities against apicomplexan parasites. In the present study, we evaluated the inhibitory effect of apicidin on the asexual growth of bovine Babesia parasites (B. bovis and B. bigemina) in vitro, as well as on the in vivo growth of B. microti in mice. The growth of B. bovis and B. bigemina was significantly inhibited in the presence of 3 ng/ml apicidin. Complete inhibition of B. bovis and B. bigemina growth was achieved on the fourth and third days, respectively, after treatment with 729 ng/ml apicidin. These parasites failed to grow again even when drug-free medium was substituted. The 50% inhibitory concentrations of apicidin against B. bovis and B. bigemina were... |
|
Palavras-chave: Apicidin; B .bovis; B .bigemina; B. microti; Asexual growth. |
| Ano: 2009 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/2386 |
| |
|
|
| Munkhjargal, Tserendorj; AbouLaila, Mahmoud; Mohamad Alaa Terkawi; Sivakumar, Thillaiampalam; Ichikawa, Madoka; Davaasuren, Batdorj; Nyamjargal, Tserendorj; Yokoyama, Naoaki; Igarashi, Ikuo; 横山, 直明; 五十嵐, 郁男. |
| We evaluated the inhibitory effects of pepstatin A and mefloquine on the in vitro and in vivo growths of Babesia parasites. The in vitro growth of Babesia bovis, B. bigemina, B. caballi, and B. equi was significantly inhibited (P < 0.05) by micromolar concentrations of pepstatin A (50% inhibitory concentrations = 38.5, 36.5, 17.6, and 18.1 μM, respectively) and mefloquine (50% inhibitory concentrations = 59.7, 56.7, 20.7, and 4 μM, respectively). Furthermore, both reagents either alone at a concentration of 5 mg/kg or in combinations (2.5/2.5 and 5/5 mg/kg) for 10 days significantly inhibited the in vivo growth of B. microti in mice. Mefloquine treatment was highly effective and the combination treatments were less effective than other treatments.... |
| Ano: 2012 |
URL: http://ir.obihiro.ac.jp/dspace/handle/10322/3829 |
| |
| Registros recuperados: 39 | |
|
|
|
