| Co-Investigator(Kenkyū-buntansha) |
IHARA kenji Kyushu University, Pediatrics, Teaching Stuff, 大学院・医学系研究科, 助手 (80294932)
TAKADA Hidetoshi Kyushu University, Pediatrics, Teaching Stuff, 大学院・医学系研究科, 助手 (70294931)
OHGA Shouichi Kyushu University, Pediatrics, Assistant Professor, 医学部, 助手(併任講師) (60233053)
NOMURA Akihiko Kyushu University, Pediatrics, Senior Resident, 医学部, 医員
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| Research Abstract |
Abstract
Knowledge of the host immune response against Salmonella is not sufficient in humans. In the present study, Th1- and Th-1 including cytokines and T cell response were investigated in salmonellosis.
Serum Th-1 and Th-1including cytokine levels at acute phase in patients with salmonellosis were elevated. In addition, serum levels of IL-15 and IL-18 in patients with systematic form of salmonellosis were significantly higher than those in patients gastroenteritis form. By serial determination, serum IFN-γ ,IL-12, IL-15 and IL-18 levels in gastroenteritis form returned to normal levels easier than those in systematic form.
IFN-γ level was significantly correlated with IL-12 and IL-18 levels. In addition, IL-15 level was significantly correlated with IL-18 level. Furthermore, IFN-γ , IL-15 and IL-18 levels were significantly correlated with duration with fever.
Upon stimulation with Salmonella in vitro, IL-15 and IL-18 were produced by Salmonella, BCG or E. coli stimulation in both salmonellosis and controls, while IL-12 and IFN-γ were preferentially produced upon stimulation with Salmonella in Salmonellosis. A significant inhibition of Salmonella -induced IFN-γ production by anti-IL-12 mAb or anti-IL-18 mAb but not by anti-IL 15 mAb.
HLA-DR+T cells, CD69+T cells, γδT cells and HLA-DR+γδT cells were significantly elevated in systematic form than in gastroenteritis from. HLA-DR+T cell-number tended to correlate with serum IFN-γ, IL-15 and IL-18 levels. HLA-DR+γδT cell-number was marginally associated with IL-15 levels. Sorted γδT cells contained significantly higher levels of IFN-γ mRNA than αβT cells both in systemic and gastroenteritis forms
In summary, IL-12, IL-18, and IL-15, with complex mutual interactions , appear to be involved in total T cell activation as well as γδT cell-expansion, resulting in IFN- production for the protection against Salmonella infection in humans.
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