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ELUCIDATION OF THE DNA SYNTHETIC CYCLE OF ENTAMOEBA HISTOLYTICA

Research Project

Project/Area Number 06670269
Research Category

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

Allocation TypeSingle-year Grants
Research Field 寄生虫学(含医用動物学)
Research InstitutionKEIO UNIVERSITY

Principal Investigator

KOBAYASHI Seiki  RESEARCH ASSOCIATE,SCHOOL OF MEDICINE,KEIO UNIVERSITY, 医学部, 助手 (70112688)

Co-Investigator(Kenkyū-buntansha) SANUKI Jun-ichi  RESEARCH ASSOCIATE,SCHOOL OF MEDICINE,KEIO UNIVERSITY, 医学部, 助手 (90255571)
Project Period (FY) 1994 – 1995
Project Status Completed (Fiscal Year 1995)
Budget Amount *help
¥2,100,000 (Direct Cost: ¥2,100,000)
Fiscal Year 1995: ¥700,000 (Direct Cost: ¥700,000)
Fiscal Year 1994: ¥1,400,000 (Direct Cost: ¥1,400,000)
KeywordsEntamoeba histolytica / Entamoeba invadens / DNA synthetic cycle / flow cytometry / mathematical modeling / Entamoeba dispar / axnic cultivation / DNA polymerase / Pseudomonas aeruginosa
Research Abstract

We developed a method to study the DNA synthetic cycles of Entamoeba histolytica and Entamoeba invadens by flow cytometry (FCM) based on a preparative procedure to reduce both high levels of natural fluorescence and non-specific adsorption of flurochromes. We modeled G_1, S,and G_2 phases as a series of overlapping Gaussian curves. Both E.histolytica and E,invadens displayd G_1, S,and G_2 proportions that are consistent with eukaryotic cell populations in exponential of stationary growth phase. Exponetial phase E.histolytica populations contained a hypodiploid subset with a mass of about 20% less than the diploid value which we estimate by FCM to be 24 x 10^<-14>gDNA/cell.
Exponential phase E.invadens populations contained a hypodiploid subset with a mass of about 6% less than the diploid value which estimate by FCM to be 30 x 10^<-14>gDNA/cell.
We developed also an axnic cultivation system for Entamoeba dispar which was nonpathogenic amoeba, by using newly developed BCSI-S medium in the presence of Crithidia fasciculata. sterilized by treating with 1% hydrogen peroxide for 24 hours at 4゚C.
DNA polymerase activity of the ameba which was grown in this culture system, was detected and characterized. DNA polymerase activity was high at pH 2 to pH 6, but at pH 8 and 10 the activity was very low in nuclear extracts from both trophozoites of E.histolytica and E.dispar which were grown axnically.

Report

(3 results)
  • 1995 Annual Research Report   Final Research Report Summary
  • 1994 Annual Research Report
  • Research Products

    (19 results)

All Other

All Publications (19 results)

  • [Publications] James A. Dvorak: "Elucidation of the DNA Synthetic cycle of Entamoeba spp. using flow cytometry and mathematical modeling." The Journal of Eukaryotic microbiology. 42. 610-616 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Asao Makioka: "Detection and characterization of DNA polymerase activity in Entamoeba histolytica." Parasitology Research. 82. 87-89 (1996)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 小林正規: "赤痢アメーバの核DNA合成サイクルの解析-I" 寄生虫学雑誌(Supplement). 43. 58 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 佐貫潤一: "Polymerase chain reactionを用いた赤痢アメーバ嚢子の病原性の鑑別の検討" 寄生虫学雑誌(Supplement). 43. 436 (1994)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 小林正規: "非病原性赤痢アメーバの無菌培養の試み" 寄生虫学雑誌(Supplement). 44. 50 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] 橘 裕司: "Entamoeba disparに特異的なモノクローナル抗体の作製とE. histolyticaとの鑑別のためのその応用" 寄生虫学雑誌(Supplement). 44. 75 (1995)

    • Description
      「研究成果報告書概要(和文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] James A.Dvorak: "Educidation of the DNA synthetic cycle of Entamoeba spp.using flow cytometry and mathematical modeling" The Journal of Eukaryotic microbiology. 42. 610-616 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Asao Makioka: "Detection and characterization of DNA polymerase activity in Entamoeba histolytica" Parasitology Research. 82. 87-89 (1996)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Seiki Kobayashi: "Elucidation of the DNA synthetic cycle of Entamoeba histolytica-I" Japanese Journal of Parasitology. 43 (Supplement, in Japanese). 58 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Jun-ichi Sanuki: "Elucadation of the pathogenicity of Entamoeba histolytica by using polymerase chain reaction from DNA of Cyst" Japanese Journal of Parasitology. 43 (Supplement, in Japanese). 436 (1994)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Seiki Kobayashi: "An attempt to establosh axnic culture of nonpathogenic Entamoeba histolytica (Entamoeba dispar Brumpt, 1925)" Japanese Journal of Parasitology. 44 (Supplement, in Japanese). 50 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] Hiroshi Tachibana: "Preparation of a monoclonal antibody specific for Entamoeba dispar and its application for distinguishing between E.dispar and E.histolytica" Japanese Journal of Parasitology. 44 (Supplement, in Japanese). 75 (1995)

    • Description
      「研究成果報告書概要(欧文)」より
    • Related Report
      1995 Final Research Report Summary
  • [Publications] James A. Dvorak: "Elucidation of the DNA synthetic cycle of Entamoeba spp. using flow cytometry and mathematical modeling." The Journal of Eukaryotic microbiology. 42. 610-616 (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] Asao Makioka: "Detection and characterization of DNA polymerase activity in Entamoeba histolytica" Parasitology Research. 82. 87-89 (1996)

    • Related Report
      1995 Annual Research Report
  • [Publications] 小林正規: "非病原性赤痢アメーバの無菌培養の試み" 寄生虫学雑誌(supplement). 44. 50- (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 橘裕司: "Entamoba disparに特異的なモノクローナル抗体の作製とE. histolyticaとの鑑別のためのその応用" 寄生虫学雑誌(supplement). 44. 75- (1995)

    • Related Report
      1995 Annual Research Report
  • [Publications] 佐貫潤一: "Polymerase chain reactionを用いた赤痢アメーバ嚢子の病原性の鑑別の検討" 寄生虫学雑誌(supplement). 43. 436- (1994)

    • Related Report
      1995 Annual Research Report
  • [Publications] 小林正規: "赤痢アメーバ核DNA合成サイクルの解析-I" 寄生虫学雑誌. 43,suppl.58 (1994)

    • Related Report
      1994 Annual Research Report
  • [Publications] James A. Dvorak: "Elucidation of the DNA synthetic cycle of Entamoeba spp. using flow cytometry and mathematical modeling." The Journal of Eukaryotic microbiology. (in press). (1995)

    • Related Report
      1994 Annual Research Report

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Published: 1994-04-01   Modified: 2016-04-21  

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