Toxoplasmacidal Effect of HL-60 Cells Differentiated by Dimethylsulfoxide

Dimethylsulfoxide로 분화시킨 HL-60 세포의 yoxoplasma 파괴 효과

  • Choe, Won-Yeong (Department of Parasitology, Catholic Medical College) ;
  • Nam, Ho-U (Department of Parasitology, Catholic Medical College) ;
  • Yu, Jae-Eul (Department of Parasitology, Catholic Medical College)
  • 최원영 (가톨릭대학 의학부 기생충학교실) ;
  • 남호우 (가톨릭대학 의학부 기생충학교실) ;
  • 유재을 (가톨릭대학 의학부 기생충학교실)
  • Published : 1988.12.01


In vitro culture of Toxoplasma gondii in HL-60 cells and cell-mediates immunity against Toxoplasma in dimethylsulfoxide(DMSO) -induced HL-60 cells, i.e., differentiation into granulocytes, were pursued. HL-60 calls were treated with various concentrations of DMSO, and 1.3%(v/v) for 3 day incubation was chosen as the optimal condition icy differentiation into granulocytes. The degree of differentiation was assayed in physiological and functional aspects in addition to morphological point. When treated with 1.3% DMSO for 3 days, HL-60 cells did not synthesiar DNA materials beyond background level, and showed active chemotactic response to chemotactic peptide, formal-methionyl-leucyl-phenylalanine(FMLP). Morphologically promyelocytes of high nuclearlcytoplasmic(NIC) ratio changed to granulocytes of relatively low WJC ratio. The relationships between HL-60 cells or DMSO-induced HL-60 cells and Toxoplasma were examined after stain with Giemsa and Buorescent dye (acridine orange). HL-60 cells did not show any sign of torso- plasmacidal activity but showed intracellular proliferation of Texoplasma to form rosette for 72 hr co-culture. In contrast, OMSO-induced HL-60 cells phagocytosed Toxoplasma within 1 hr, and performed a process of intracellular digestion of Toxoplasma thereafter. With the above results, it is suggested that phagosome-Iysosome fusion is one of the critical events for the parasitism by Toxoplasma or for susceptibility of host cells. The in vitro culture system of this study has offered a defined condition to study the protozoan parasite-host cell interactions.