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[Cytotoxicity of lymphokine activated peritoneal macrophages against Trichomonas vaginalis]
1Department of Parasitology, College of Medicine, Hanyang University, Seoul, Korea.
Abstract:
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.
Insights
Lymphokine-activated killer cells, specifically macrophages treated with interleukin-2 (rIL-2) or interferon-gamma (rIFN-gamma), show enhanced cytotoxicity against Trichomonas vaginalis. However, interleukin-4 (rIL-4) reduces this effect, suggesting complex immune regulation.
Area of Science:
- Immunology
- Parasitology
- Cell Biology
Context:
- Trichomonas vaginalis is a common human urogenital parasite.
- Macrophages possess innate cytotoxicity against T. vaginalis.
- The role of lymphokine-activated macrophages in T. vaginalis cytotoxicity is unexplored.
Purpose:
- To investigate the cytotoxic effect of lymphokine-activated mouse peritoneal macrophages against T. vaginalis.
- To determine the influence of specific cytokines (rIL-2, rIFN-gamma, rIL-4) on macrophage-mediated cytotoxicity.
Summary:
- Recombinant interleukin-2 (rIL-2) and interferon-gamma (rIFN-gamma) significantly enhanced macrophage cytotoxicity against T. vaginalis.
- Recombinant interleukin-4 (rIL-4) inhibited this cytotoxicity, even when combined with other cytokines.
- Nitrite production correlated with cytotoxicity for rIFN-gamma and rIL-4, but not for rIL-2 and rIFN-gamma, suggesting nitric oxide may inhibit parasite proliferation.
Impact:
- Provides novel insights into cytokine-mediated immune responses against Trichomonas vaginalis.
- Suggests potential therapeutic strategies involving cytokine modulation for treating trichomoniasis.
- Highlights the complex role of nitric oxide in the host-parasite interaction.