A protective antigen for Turkeys purified from a type 1 strain of Pasteurella multocida

A protective antigen was purified from a saline extract of a Type 1 strain of Pasteurella multocida by chromatographic methods, and its chemical and immunological ccharacteristics were studied. Three protein peaks were obtained from crude extract by gel filtration with Sephadex G-200. A bacteria-specific antigen was detected only in the first peak fraction, which, after passing through an immunoadsorbent column to remove any components originating from the growth medium, was adsorbed onto DEAE-cellulose followed by elution with a gradient of NaCl. From the first peak fraction of the gel filtration, 4 protein peaks were obtained, the second and third peaks being the major ones. Carbohydrate/protein ratios of the peak fractions varied from 0.06 to 1.0. Sodium dodecyl sulfate-polyacrylamide gel electrophoresis showed that 2 proteins of molecular weights 44 000 and 25 000 were present in all the fractions. The 4 DEAE-cellulose fractions (DP-1 to DP-4) contained a single antigenically identical material, and induced protective immunity in turkeys against challenge exposure. The second peak fraction from DEAE-cellulose (DP-2) protected turkeys when subcutaneously injected as 2 doses of 10 μg protein with a 14-day interval between doses. The DP-2 fraction induced antibodies in rabbits which formed a single precipitin line against the crude extract. The purified antigen (DP-2) from a Type 1 strain was antigenically distinct from a similar antigen purified from a Type 3 strain; there was no significant cross protection in turkeys between the 2 antigens. These results indicate that protective antigens purified from soluble extracts of a Type 1 or Type 3 strain possess similar physicochemical properties, but that they are immunologically distinct from each other.     

Environmental factors influencing sporocarp formation in <Emphasis Type="Italic">Typhula ishikariensis</Emphasis>

Environmental factors influencing sporocarp formation in Typhula ishikariensis were studied under controlled conditions. Sporocarp formation in T. ishikariensis was divided into two stages: stipe elongation from the sclerotium and fertile head development at the tip of the stipe. Factors required for each stage differed. At the stipe elongation stage, low temperature (10°/5°C; day/night) and high humidity were important, but light was not required. In contrast, at the fertile head stage, light and moderate day length (8h/day) were essential. Fertile heads developed at 46µEm^–2s^–1; and high intensity (137µEm^–2s^–1) did not suppress development. Moreover, adding unsterilized soil to the sea sand medium accelerated sporocarp formation. These findings imply that the sclerotium of T. ishikariensis recognizes several physical factors for sporocarp formation. Sporocarps of T. ishikariensis developed within 4 weeks after incubation under optimal conditions. The sporocarp produced basidiospores, and differential mating incompatibility was confirmed among monokaryons derived from basidiospores produced under artificial conditions. This method should be useful for obtaining monokaryons for genetic studies of T. ishikariensis.     

Molecular survey of Babesia infection in dogs in Okinawa, Japan

A total of 80 free-roaming dogs on Okinawa Island, Japan, were examined for Babesia infection using the polymerase chain reaction (PCR) and sequence analysis. Of 80 samples, 12 were positive in a Babesia genus-specific PCR. Consequent species-specific PCR for B. canis and B. gibsoni revealed that 5 (6.3%) and 7 (8.8%) dogs were infected with B. canis and B. gibsoni, respectively. Sequence analysis of the PCR products revealed that the 18S rRNA gene sequence of B. canis detected from dogs in Okinawa was very close to B. canis vogeli with sequence similarity of 99.94%.     

Cell surface expression of a chimeric protein containing mouse immunoglobulin G1 Fc domain and its immunological property

Recently we reported that a chimeric molecule containing mouse transferrin receptor and immunoglobulin G1 (IgG1) Fc, mTR-Fc, induced higher immune responses and can be used as a vaccine adjuvant. In this study, the immunological property of the molecule was investigated. Although, the mTR-Fc did not activate complement classical pathway, it was recognized by activated macrophage as like intact IgG Fc, which is recognized by macrophage via Fcgamma receptor. In addition, we found that splenocyte simultaneously exposed to lipopolysaccaride (LPS) and mTR-Fc produced higher amount of interleukin-10, comparing to that exposed to only LPS. These results suggest that the mTR-Fc molecules conserved the IgG Fc property to biasing immune responses via modulation of cytokine production by antigen presenting cell.     

Occurrence of swine salmonellosis in postweaning multisystemic wasting syndrome (PMWS) affected pigs concurrently infected with porcine reproduction and respiratory syndrome virus (PRRSV)

Fourteen diseased pigs from four farms in which there had been an outbreak of salmonellosis were investigated. Granulomatous inflammation with depletion of lymphocytes was observed in the swollen lymph nodes in these pigs. Antigens to porcine circovirus type 2 (PCV2) were immunolabeled in the lesions along with detection of viral DNA as PCV2 by polymerase chain reaction (PCR). In addition, antigens to porcine reproductive respiratory syndrome virus (PRRSV) were immunodetected in the lungs and Salmonella Choleraesuis was isolated from the affected pigs. The nine salmonellosis affected pigs, five (55.6%) with salmonellosis and PMWS concurrently infected with PRRSV were much higher than those infected with salmonellosis and PMWS (22.2%) or with salmonellosis and PPPRV (22.2%).     

A fusion protein of IgG fc and mouse-derived antigen on the surface of pseudorabies virus particles does not accelerate production of harmful auto-reactive antibodies

Previously we reported that immunization with pseudorabies virus (PRV), harboring chimeric Fc on the surface of the virus particles (PRV/Fc), induced higher immune responses than normal PRV particles. The chimeric Fc was fused with mouse transferrin receptor of transmembrane domain (mTR) and the Fc region of immunoglobulin G1. Since it has been reported that some chimeric protein of Fc and self-antigen induce auto-reactive antibodies, in this present study, we examined whether PRV/Fc induces auto-reactive antibodies that react with mTR. PRV/Fc immunized mice produced higher levels of anti-PRV antibodies and antibodies that reacted with mouse-derived 3T3/A31 cells (A31 cell), compared to normal PRV immunized mice. However, antibodies that reacted with mTR in A31 cells were not detected in both Western blot analyses and indirect immunofluorescence assay. The antibodies reacted with an antigen of approximately 16 kDa in A31 cells, but this antigen has a different molecular mass from that of mTR. The antibody also reacted with the antigen of approximately 16 kDa in RK13 cells in which the virus had been propagated. In addition, antibodies induced by immunization with normal PRV also reacted with the same antigen in A31 and RK13 cells. Moreover, neither kidney disorders, in which high levels of mTR were expressed, nor clinical symptoms of autoimmune diseases were observed in mice immunized with either PRV or PRV/Fc. These results indicated that the antibodies were not induced by mTR-Fc, but were instead induced by trace amounts of RK13 derived antigens contained in PRV or PRV/Fc preparations, and cross-reacted with equivalent molecules in mouse derived A31 cells. Therefore, this study confirmed that immunization with PRV/Fc did not induce harmful auto-reactive antibodies.     

Expression and subcellular localization of GSE protein in germ cells and preimplantation embryos

We previously identified a novel gonad-specific expression gene (Gse) and investigated its expression during gametogenesis in the mouse testis and ovary. In this study, we generated a polyclonal antibody to GSE protein and determined the profiles of the protein's expression in germ cells and preimplantation embryos in detail using immunocytochemical and immunofluorescence staining. In a Western blot analysis, the anti-GSE antibody recognized long and short isoforms (approximately 27.6 kDa and 23.1 kDa) of the protein in the mouse testis and the long isoform in the ovary. In the mouse testis, GSE protein was expressed in spermatocytes I in the pachytene stage, round spermatids, and elongated spermatids. In the mouse ovary, the protein was located in the cytoplasm and nucleus of all oocytes regardless of the stage of the ovarian follicles. In preimplantation embryos from the pronuclear to blastocyst stage, however, GSE protein was mainly detected in the nuclei of cells. At the blastocyst stage, the protein was confirmed to have accumulated in the inner cell mass (ICM), whereas it had mostly disappeared from the trophectoderm (TE). These findings suggest that GSE protein may play a role in the establishment of nuclear totipotency and may be associated with early lineage specification.     

The oral administration of thermophile-fermented compost extract and its influence on stillbirths and growth rate of pre-weaning piglets

Food produced via fermentation with mesophilic bacteria has been used to confer health benefits. In contrast, mammalian physiological responses to the intake of thermophile-fermented products have not been thoroughly investigated. We examined the effects of administering a compost extract consisting of fermented marine animals with thermophiles, including Bacillaceae, to pregnant sows and piglets. Retrospective studies were performed on two different swine farms (n=330-1050 sows). The rate of stillbirth was markedly lower in all parities of the compost extract-fed group compared to those of the control group (p≦0.001). Additionally, the birth to weaning period of newborns was significantly shorter (p<0.0001), while the ratio of weanlings per liveborn piglets was increased by more than 6.5% in the compost extract-fed group. Thus thermophiles and their products in the compost extract might promote growth and reduce stillbirths of piglets during the birth to weaning period.     

Expression of NOS and VEGF in feline mammary tumours and their correlation with angiogenesis

In order to define the role of nitric oxide (NO) in feline mammary tumours, the expression of endothelial or inducible nitric oxide synthase (e/iNOS) and vascular endothelial growth factor (VEGF), and their relationship with angiogenesis, was investigated in 23 feline mammary tumours (two hyperplastic, 19 adenocarcinoma, one osteosarcoma and one squamous cell carcinoma) by immunohistochemistry. Tumour angiogenesis was assessed by CD31 immunostaining and was expressed as microvessel density (MVD). In general, iNOS immunoreactivity was localised in tumour cells and occasionally in stromal myofibroblasts, whereas eNOS and VEGF were localised in the cytoplasm of tumour epithelial cells and endothelium. In malignancy, expression of iNOS increased from well- to less-differentiated phenotypes (Grades 1-3) and was significantly higher in G3 and G2 when compared with G1 cases. However, increasing eNOS expression was limited only in hyperplastic lesions and showed no significant changes among the grades. In addition, expression of iNOS was positively correlated with VEGF and MVD in feline mammary tumours and both measures were significantly greater in less differentiated phenotypes (P<0.05). In conclusion, the expression of NOS isoforms in feline mammary tumours depended on tumour grade, and the positive correlations between iNOS and angiogenic markers suggests that iNOS synthesised by tumour cells promotes tumour growth. Thus, iNOS can be used as an important immunohistochemical marker to determine the degree of malignancy and prognosis of feline mammary carcinoma.     

Multiple inflammatory gastric polyps treated by endoscopic polypectomy with argon plasma coagulation in a dog

An 11‐year‐old spayed female miniature dachshund was evaluated for a 2‐month history of chronic vomiting. Abdominal ultrasonography revealed a heterogeneous mass in the pyloric region. Contrast upper gastrointestinal radiography demonstrated impairment of gastric outflow. Endoscopic examination revealed multiple polyps at the gastric pylorus. The pyloric polyps were variable in size, sessile‐shaped and pedunculated. Initially, endoscopic polypectomy was attempted, but all the polyps could not be completely resected. Thus, endoscopic polypectomy with argon plasma coagulation was performed to cauterise the lesions. The histopathological diagnosis of the lesions was inflammatory polyps, and a moderate number of Helicobacter spp. was revealed. After the argon plasma coagulation treatment, the dog did not vomit, and improvement of clinical signs was maintained for 13 months. Endoscopic polypectomy with argon plasma coagulation may be useful for mixtures of sessile and pedunculated polyps. The present report may provide a basis for further studies of argon plasma coagulation treatment for canine gastrointestinal polyps.