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KMID : 0893420080090030309
Journal of Veterinary Science
2008 Volume.9 No. 3 p.309 ~ p.315
Cytokine response in Balb/c mice infected with Francisella tularensis LVS and the Pohang isolate
Kim Eun-Ju

Park Sang-Hee
Choi Young-Sill
Shim Soo-Kyoung
Park Mi-Yeoun
Park Man-Suck
Hwang Kyu-Jam
Abstract
We investigated the immune response induced by the Francisella (F.) tularensis live vaccine strain (LVS) and the Pohang isolate. After the Balb/c mice were infected intradermally (i.d) with 2 ¡¿ 104 cfu of F. tularensis LVS and Pohang, respectively, their blood and organs were collected at different times; 0, 3, 6, 24, 72, 96, 120 and 168 h after infection. Using these samples, RT-PCR and ELISA analysis were carried out for the comparative study of the cytokines, including TNF-¥á, INF-¥ã, IL-2, IL-4, IL-10 and IL-12. In the Pohang-infected mice at 120 h, the liver showed a 53 times higher level of TNF-¥á and a 42 times higher level of IFN-¥ã than the respective levels at the early time points after infection. The levels of TNF-¥á and IFN-¥ã induced by LVS were 5 times lower than those induced by the Pohang isolate. Also, the organs from the Pohang-infected mice showed higher levels of TNF-¥á, IFN-¥ã, IL-10 and IL-12 than the levels in the LVS-infected mice. The blood from the Pohang-infected mice at 120 h revealed about a 40 times increased level of IFN-¥ã, and IL-10 was also increased by 4 times at 96 h compared to an early infection time point, while IL-4 was not induced during the whole infection period. These results suggest that F. tularensis may induce a Th1-mediated immune response to in vivo infection and the Pohang isolate has a higher capacity than the LVS to induce an acute immune response in Blab/c mice.
KEYWORD
Balb/c, F, tularensis, IFN-¥ã, IL-12, TNF-¥á
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