Korean J Parasitol.  1991 Dec;29(4):381-383. 10.3347/kjp.1991.29.4.381.

Cytotoxicity of lymphokine activated peritoneal macrophages against Trichomonas vaginalis

  • 1Department of Parasitology, College of Medicine, Hanyang University, Seoul, Korea.


Trichomonas vaginalis is a parasitic flagellate in the urogenital tract of human. Innate cytotoxicity of macrophages against T. vaginalis has been recognized, but any report on the cytotoxicity of lymphokine-activated macrophages to T. vaginalis is not yet available. The present study aimed to elucidate the lymphokine-activated cell mediated cytotoxic effect against T. vaginalis by mouse peritoneal macrophages. Cytotoxicity was measured by counting the release of 3H-thymidine from prelabeled protozoa, and tested in U-bottom microtiter plates. Nitrite concentration in culture supernatants was measured by standard Griess reaction. The results obtained are as follows: 1. The cytotoxicity of macrophages was increased by addition of rIL-2 or rIFN-gamma. 2. Cytotoxicity of macrophages was reduced by addition of rIL-4 to rGM-CSF, rIL-2 or rIFN-gamma. 3. Crude lymphokine mixed with anti-IL-2 decreased the cytotoxicity of macrophages. 4. In case of macrophages cultured with rIFN-gamma or rIL-4, the concentration of nitrite was related with cytotoxicity of macrophages against T. vaginalis, but the cytotoxicity of macrophages cultured with rIL-2 and rIFN-gamma was decreased in spite of its high production of nitrite. From the results obtained, it is assumed that rIL-2 and rIFN-gamma enhance the cytotoxicity of macrophages while rIL-4 inhibits the cytotoxicity against T. vaginalis, and that the production of nitrite does not relate with the cytotoxicity of macrophages, but nitric oxide may play a role as an inhibitory factor on the proliferation of T. vaginalis.

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