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Studies on the transmission modes of bovine neospora and its infectivity to humans

Research Project

Project/Area Number 12556052
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section展開研究
Research Field Applied veterinary science
Research InstitutionHokkaido University

Principal Investigator

TAKASHI Umemura  Graduate School of Veterinary Medicine, Professor, 大学院・獣医学研究科, 教授 (00151936)

Co-Investigator(Kenkyū-buntansha) HITOSHI Chiba  School of Medicine, Medical Hospital, Assistant Professor, 医学部附属病院, 講師 (70197622)
AKINORI Shimada  Faculty of Agriculture, Tottori University, Professor, 農学部, 教授 (20216055)
Project Period (FY) 2000 – 2002
Project Status Completed (Fiscal Year 2002)
Budget Amount *help
¥13,200,000 (Direct Cost: ¥13,200,000)
Fiscal Year 2002: ¥2,700,000 (Direct Cost: ¥2,700,000)
Fiscal Year 2001: ¥3,900,000 (Direct Cost: ¥3,900,000)
Fiscal Year 2000: ¥6,600,000 (Direct Cost: ¥6,600,000)
KeywordsNeospopra caninum / neosporosis / bovine abortion / persistent infection / steroid hormones / transneural infection / zoonosis / vertical transmission / 免疫制御 / 診断用抗原 / 原虫再活性化 / ズーノーシス
Research Abstract

We isolated the persistently infected tachyzoites of Neospora (N.) caninum from the brain of seropositive cow. The protozoa inoculated subcutaneously to female mice invaded the brain via hematogenerous route and persisted in situ. The persistently-infected protozoa reactivated at pregnancy and infected fetuses transplacentally.
Seropositive cows for N. caninum were widely and densely distributed among the farms in Hokkaido and most of them were infected transplacentally from their dams.
Four of 271 human serum samples collected at medical hospital had the antibody against N. caninum. Detailed examination on the positive cases revealed that those patients were immunized with N. caninum antigen but might not be infected with the protozoa.
Neospora caninum antigens recognized by lgG of mice were analyzed by western blot at various stages of infection. Forty-three kda antigen was consistently recognized by the infected host and this antigen was best recommended for the detection kit of N. caninum antibody.
Effects of three, pregnancy-related steroid hormones (progesterone, estrabiol-17β and corticosterone) on the reactivation of N. caninum were examined using mice and Vero cells infected with the protozoa.
Physiological levels of steroid hormones did not reactivated N. caninum in the brain of the mice and cell culture. Neospora caninum was injected in the eye balls and food pad of immunodeficient nude mice, immunocompetent mice and hyperimmunized mice. The protozoa propagated mainly via hematogeneous route in the nude mice, via both hematogeneous and transneural routes in immunocompetent mice, and via transneural route in hyperimmunized mice. This experiment was the first in which transneural propagation of protozoa was substantiated by the animal experiment.

Report

(4 results)
  • 2002 Annual Research Report   Final Research Report Summary
  • 2001 Annual Research Report
  • 2000 Annual Research Report
  • Research Products

    (17 results)

All Other

All Publications (17 results)

  • [Publications] Tomioka, Y.: "Neospora caninum antigens recognized by mouse IgG at different stages of infection and under immunosuppression"J.Vet.Med.Sci.. 65(in press). (2003)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kobayashi, A.: "Steroid hormones do not reactivate Neospora caninum in ovariectomized mice"J.Vet.Med.Sci.. 64. 773-777 (2002)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Park, C.H.: "Neospora caninum infected the alimentary tract of nude mice and was transmitted to other mice by intraperitoneal inoculation with the intestinal contens"J.Vet.Med.Sci.. 62. 525-527 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Sawada, M.: "Isolation of Neospora caninum from the brain of an adult naturally infected dairy cow"Vet.Prasitol.. 90. 247-252 (2000)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yamane, I.: "An improved isolation technique for bovine Neospora species"J.Vet.Diagn.Invest.. 10. 362-366 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Sawada, M.: "Serological survey of antibody to Neospora caninum in Japanese dogs"J.Vet.Med.Sci.. 60. 853-854 (1998)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Tomioka Y.: "Neospora caninum antigens recognized by mouse lgG at different stages of infection and under immunosuppression"J. Vet. Med. Sci.. 65. in press (2003)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Kobayashi A.: "Steroid hormones do not reactivate Neospora caninum in ovariectomized mice"J. Vet. Med. Sci.. 64. 773-777 (2002)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Park C. H.: "Neospora caninum infected the alimentary tract of nude mice and was transmitted to other mice by intraperitoneal inoculation with the intestinal contents"J. Vet. Med. Sci.. 62. 525-527 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Sawada M.: "Isolation of Neospora caninum from the brain of an adult naturally infected dairy cow"Vet. Parasitol.. 90. 247-252 (2000)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Yamane I.: "An improved isolation technique for bovine Neospora species"J. Vet. Diagn. Invest.. 10. 362-366 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Sawada M.: "Serological survey of antibody to Neospora caninum in Japanese dogs"J. Vet. Med. Sci.. 60. 853-854 (1998)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] Sawada M.: "Pathological findings of nude mice inoculated with bovine Neospora"J. Vet. Med. Sci.. 59. 947-948 (1997)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      2002 Final Research Report Summary
  • [Publications] A.Kobayashi: "Steroid hormones do not reactivate Neospora caninum in ovariectomized mice"Journal of Veterinary Medical Science. 64. 773-777 (2002)

    • Related Report
      2002 Annual Research Report
  • [Publications] Y.Tomioka: "Neospora caninum antigens recognized by mouse IgG at different stages of infection and under immunosuppression"Journal of Veterinary Medical Science. 65(in press). (2003)

    • Related Report
      2002 Annual Research Report
  • [Publications] M.Sawada: "Isolation of Neospora caninum from the brain of a naturally infected adult dairy cow"Veterinary Parasitology. 90. 247-252 (2000)

    • Related Report
      2000 Annual Research Report
  • [Publications] C-H Park: "Neospora caninum infected the alimentary tract of nude mice and was transmitted to other mice by infra peritoneal loculation with the intestinal contents"Journal of Veterinary Medical Science. 62. 525-527 (2000)

    • Related Report
      2000 Annual Research Report

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Published: 2000-04-01   Modified: 2016-04-21  

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