Abstract
Ocular toxoplasmosis (OT) is the major cause of infective uveitis. Since the eye is a special organ protected by immune privilege, its immune response is different from general organs with Toxoplasma gondii infection. Here, we used Kunming outbred mice to establish OT by intravitreal injection of T. gondii RH strain tachyzoites, IL-33 expression in the eyes was localized by immunostaining, the levels of interleukin (IL)-33 and ST2 (IL-33 receptor) and T-helper (Th)1 and Th2-associated cytokines in the eye and cervical lymph nodes (CLNs) of infected mice were measured, and their correlations were analyzed. Our results showed that the pathologies of the eye and CLN tissues and the IL-33 positive cells in the eye tissues of ocular T. gondii-infected mice were all increased at days 2, 6, and 9 postinfection (p.i.), accompanied with significantly increased transcript levels of IL-33, ST2, IL-1β, IFN-γ, IL-12p40, IL-10, and IL-13 in both the eyes and CLNs, and increased IL-4 expressions in the eyes of T. gondii-infected mice. There were significant correlations between the levels of IFN-γ and ST2, IL-4 and ST2, and IL-13 and ST2 in the eye tissues (P < 0.001), significant correlations between the levels of IFN-γ and ST2 (P < 0.001) as well as between IL-13 and ST2 (P < 0.05) in the CLNs, and significant correlations between the levels of IL-1β and IL-33 in the eyes (P < 0.05) and between IL-1β and IL-33/ST2 in the CLNs (P < 0.001 and P < 0.01, respectively). Our data indicated that IL-33/ST2 may involve the regulation of ocular immunopathology induced by T. gondii infection.
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Acknowledgments
This work was supported in part by grants from the Natural Science Foundation of China to F.L. (nos. 81271854 and 81471973) and the Guangdong Natural Science Foundation, China to F.L. (no. S2013010016736).
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Tong, X., Lu, F. IL-33/ST2 involves the immunopathology of ocular toxoplasmosis in murine model. Parasitol Res 114, 1897–1905 (2015). https://doi.org/10.1007/s00436-015-4377-3
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DOI: https://doi.org/10.1007/s00436-015-4377-3