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This study was performed to investigate the mechanism of action of ursolic acid in terms of anti- Toxoplasma gondii effects, including immunomodulatory effects. We evaluated the anti- T. gondii effects of ursolic acid, and analyzed the production of nitric oxide (NO), reactive oxygen species (ROS), and cytokines through co-cultured immune cells, as well as the expression of intracellular organelles of T. gondii . The subcellular organelles and granules of T. gondii , particularly rhoptry protein 18, microneme protein 8, and inner membrane complex sub-compartment protein 3, were markedly decreased when T. gondii was treated with ursolic acid, and their expressions were effectively inhibited. Furthermore, ursolic acid effectively increased the production of NO, ROS, interleukin (IL)-10, IL-12, granulocyte macrophage colony stimulating factor (GM-CSF), and interferon-β, while reducing the expression of IL-1β, IL-6, tumor necrosis factor alpha (TNF-α), and transforming growth factor beta 1 (TGF-β1) in T. gondii -infected immune cells. These results demonstrate that ursolic acid not only causes anti- T. gondii activity/action by effectively inhibiting the survival of T. gondii and the subcellular organelles of T. gondii , but also induces specific immunomodulatory effects in T. gondii -infected immune cells. Therefore, this study indicates that ursolic acid can be effectively utilized as a potential candidate agent for developing novel anti-toxoplasmosis drugs, and has immunomodulatory activity.

The Mechanism of Action of Ursolic Acid as a Potential Anti-Toxoplasmosis Agent, and Its Immunomodulatory Effects