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Ecological regulation mechanism of cytotoxin activity produced by Clostridium difficile

Research Project

Project/Area Number 61570218
Research Category

Grant-in-Aid for General Scientific Research (C)

Allocation TypeSingle-year Grants
Research Field 細菌学
Research InstitutionTokai University, School of Medicine

Principal Investigator

ATSUSHI OZAWA  Department of Mictobiology, Tokai University School of Medicine, 医学部・(微生物学), 教授 (50055638)

Co-Investigator(Kenkyū-buntansha) KEIICHI WATANABE  Department of Pathology, Tokai University School of Medicine, 医学部・(病理学), 教授 (00055865)
NOBUHIKO OHNISHI  Department of Microbiology, Tokai University School of Medicine, 医学部・(微生物学), 助手 (30051717)
Project Period (FY) 1986 – 1987
Project Status Completed (Fiscal Year 1987)
Budget Amount *help
¥2,200,000 (Direct Cost: ¥2,200,000)
Fiscal Year 1987: ¥1,000,000 (Direct Cost: ¥1,000,000)
Fiscal Year 1986: ¥1,200,000 (Direct Cost: ¥1,200,000)
KeywordsContinuous floe culture / Clostridium difficile / 無菌マウス / CF培養 / 細胞毒活性作用
Research Abstract

An anaerobic continuous flow (CF) culture method was used in order to study the effect of Peprostrptococcus magnus and Streptococcus parvulus, anarobic grampositive cocci which are membeis of intestinal bacterial flora, on growth and cytotoxinactivity of Clostridium difficile. The gtowth- and the cytotoxin activity-patterns of C. difficile in an established CF culture of P.magnus were similar to those of C. difficile alone. On the other hand, in the mixed culture system of C. difficile and S. parvulus, the cytotoxin levels were significatly lower as compared with C.difficile alone in spite of the fact no differences existed between growth of C. difficile in mixed and single culture system. The culture filtrate of P. magnus did not influence the growth and cytotoxin production of C. difficile, nor did that of S. parvulus have any effect on growth of C. difficile in static culture. The cytotoxin activity of C. difficile was, however, suppressed by the culture filtrate of S. parvulus. Furthermore, when P. magnus of S. parvulus was statically cultured in a medium containing cytotoxic culture filtrate of C. difficile, the toxin in the medium was not inactivated.

Report

(2 results)
  • 1987 Final Research Report Summary
  • 1986 Annual Research Report
  • Research Products

    (13 results)

All Other

All Publications (13 results)

  • [Publications] 小澤敦,高橋靖侑,沢村貞昭,柳川容子: 厚生省特定疾患-消化吸収障害調査研究実績集. 13-18 (1981)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 小澤敦,高橋靖侑,相場勇志: 臨床検査. 30. 609-616 (1986)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T.Yamamoto;Y.Takahashi;Y.Aiba;N.Ohnishi and A.Ozawa: Microbiology and Immunology. 31. 949-958 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 小澤敦: "「細菌学はここまで進んだ」-機構をめぐって,C.difficile毒素活性の細菌生態学的制御" 菜根出版, 16 (1987)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] ATSUSHI OZAWA, YASUTOMO TAKAHASHI, SADAAKI SAWAMURA, YOKO YANAGAWA: "Ecological Analysis of Intestinal Bacterial Flora in the Diarrheal patients by Antibiotic Administration" Achievement of Malabsorption Research Group. 13-18 (1981)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] ATSUSHI OZAWA, YASUTOMO TAKAHASHI, YUJI AIBA: "Intestinal Flora and Diseases" Journal of Medical Technology. 30. 609-616 (1986)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] T. YAMAMOTO, Y. TAKAHASHI, Y. AIBA, N. OHNISHI ; A. OZAWA: "Effect of Streptococcus parvulus and Peprostreptococcus magnus on Cytotoxin Levels of Clostridum difficile in Anaerobic Continuous Flow Culture" Microbiology and Immunology.

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] ATSUSHI OZAWA: SAIKON Publidsher. Recent Advances of Bacteriology, 16 pages (1987)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1987 Final Research Report Summary
  • [Publications] 山澤敦,高橋靖侑,相場勇志,山本敬子: 厚生省特定疾患 消化吸収障害調査研究班. 44-49 (1985)

    • Related Report
      1986 Annual Research Report
  • [Publications] 山澤敦,高橋靖侑,鈴木紘一: 厚生省特定疾患 消化吸収障害調査研究班. 77-81 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] 山澤敦,高橋靖侑,相馬勇志: 臨床検査. 30. 609-616 (1986)

    • Related Report
      1986 Annual Research Report
  • [Publications] Takako Yamamoto;Yasuyuki Takahashi;Yuji Aiba;Nobuhiko Ohnishi;Atsushi Ozawa: Microbiology and Immunology.

    • Related Report
      1986 Annual Research Report
  • [Publications] 蜂須賀養悦 監修 川田十三夫,三輪谷俊夫,山澤敦,野本亀久雄,吉川昌之助,中島泉 編集: "細菌学はここまで進んだ-細菌生態学的立場を中心とした感染症の解析" 菜根出版, 464 (1986)

    • Related Report
      1986 Annual Research Report

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Published: 1987-03-31   Modified: 2016-04-21  

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