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Korean J Parasitol > Volume 29(2):1991 > Article

Original Article
Korean J Parasitol. 1991 Jun;29(2):129-137. English.
Published online Mar 20, 1994.  http://dx.doi.org/10.3347/kjp.1991.29.2.129
Copyright © 1991 by The Korean Society for Parasitology
Effect of in vivo administration of Tetrahymena pyriformis on the in vitro toxoplasmacidal activity of mouse peritoneal macrophages
C T Kim,P R Chung and K I Im
Department of Parasitology, College of Medicine, and Institute of Tropical Medicine, Yonsei University, Seoul 120-752, Korea.

Tetrahymena pyriformis is a free-living ciliate protozoan in the freshwater system. Experiments were carried out to determine whether intraperitoneal administration of T. pyriformis (GL strain) to mice activates macrophages to be able to kill Toxoplasma gondii tachyzoites in vitro.

Mice were also injected intraperitoneally with several synthetic activators; dimethyldioctadecylammonium bromide (DDA), dextran sulfate, complete Freund's adjuvant (CFA) as well as Toxoplasma and Tetrahymena lysates in order to activate mouse peritoneal macrophages. One week after the administration of activators, peritoneal cells were harvested and the adherent macrophages were challenged with Toxoplasma tachyzoites. Macrophage monolayers were then fixed with absolute methanol after washing, and stained with Giemsa solution. The percentage of the adherent cells infected and total number of organisms per 100 macrophages were calculated to make toxoplasmacidal activity of macrophages according to the cultivation time.

Peritoneal macrophages from mice administered with Tetrahymena exhibited significant protection against target parasites as compared with those treated with synthetic activators. Among non-biological synthetic activators, DDA was evaluated as an excellent activator.


Fig. 1
T. pyriformis trophozoites.

Fig. 2
Mouse peritoneal macrophage activated with T. pyriformis and infected with T. gonidii tachyzoites, 20 hrs after incubation.

Fig. 3
Perentages of mouse peritoneal macrophages treated with various activators and infected with live T. gonidii

Fig. 4
Total numbers of live T. gonidii per 100 mouse peritoneal macrophages treated with various activators.

Fig. 5
Perentages of mouse peritoneal macrophages treated with various activators and infected with heat-killed T. gonidii

Fig. 6
Total numbers of heat-killed T. gonidii per 100 mouse peritoneal macrophages treated with various activators.


Table 1
Anti-Toxoplasma activities of peritoneal macrophages from mice inoculated with various activators*

Table 2
Anti-Toxoplasma activities of peritoneal macrophages from mice inoculated with various non-specific activators*

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