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- W2091213585 abstract "IL-12 initiates the development of cell-mediated immunity by promoting the differentiation of naive T cells into the Th1 phenotype, and is essential in the development of a Th1 immune response to the intracellular protozoan parasite, Leishmania major. The present study investigated whether IL-12 is also required for the maintenance and effector function of an established Th1 immune response in L. major -infected mice. While neutralization of IL-12 com promised the ability of a leishmanial antigen-reactive Th1 cell clone to produce IFN-γ in vitro, lymphnode cells taken from 2-week L. major -infected mice were able to secrete IFN-γ in an IL-12-independent manner. However, when a short-term T cell line was established in vitro from lymph node cells, the production of IFN-γ again became IL-12 dependent. These results suggest that other factors may compensate for IL-12 in vivo in promoting IFN-γ production during L. major infection. To directly assess if IL-12 was required in vivo for resistance to L. major, we studied the effect of IL-12 neutralization on both a primary and secondary L. major infection in C3H mice. L. major infection in C3H mice is characterized by the development of a small lesion that heals by 8 weeks, and these animals are resistant to reinfection. As previously reported, administration of anti-IL-12 monoclonal antibody (mAb) during a primary infection led to severe disease. However, mice that had healed from a primary infection with L. major and were treated with anti-IL-12 mAb were as resistant as control animals. These findings suggest that once Th1 cells have developed, their effector function in vivo is independent of IL-12, and that this independence is not due to an intrinsic property of the T cell, but to the microenvironment created by the infection." @default.
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- W2091213585 date "1998-07-01" @default.
- W2091213585 modified "2023-10-18" @default.
- W2091213585 title "The role of IL-12 in the maintenance of an established Th1 immune response in experimental leishmaniasis" @default.
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- W2091213585 doi "https://doi.org/10.1002/(sici)1521-4141(199807)28:07<2227::aid-immu2227>3.0.co;2-n" @default.
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