Inhibition of Encystation of Entamoeba invadens by Aphidicolin

  • KUMAGAI Masahiro
    Department of Tropical Medicine, Jikei University School of Medicine
  • MAKIOKA Asao
    Department of Tropical Medicine, Jikei University School of Medicine
  • OHTOMO Hiroshi
    Department of Tropical Medicine, Jikei University School of Medicine
  • KOBAYASHI Seiki
    Department of Tropical Medicine and Parasitology, School of Medicine, Keio University
  • TAKEUCHI Tsutomu
    Department of Tropical Medicine and Parasitology, School of Medicine, Keio University

この論文をさがす

抄録

Effects of aphidicolin, a specific inhibitor of eukaryotic nuclear replicative DNA polymerases, on the growth and encystation of a reptilian parasitic protozoan Entamoeba invadens were evaluated. Aphidicolin blocked the growth of axenic E. invadens strain IP-1 in a dose-dependent manner. Encystation induced by the glucose depletion and osmotic pressure was also inhibited by aphidicolin. The inhibition was almost complete when trophozoites were treated with the drug before being transferred to encystation medium containing the drug. The inhibitory effect of aphidicolin on E. invadens growth was abrogated by removal of the drug, and exposure to 3 μg/ml of the drug for at least 7 days had little effect on the viability. Encystation was also restored by removal of the drug. These results suggest that the trophozoites accumulated at G1/S border by treatment with aphidicolin cannot encyst upon induction of encystation so that they need DNA synthesis before encystation.

収録刊行物

キーワード

詳細情報 詳細情報について

問題の指摘

ページトップへ