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- Title
Cytokine response in Balb/c mice infected with Francisella tularensis LVS and the Pohang isolate.
- Authors
Eun-Ju Kim; Sang-Hee Park; Young-Sill Choi; Soo-Kyoung Shim; Mi-Yeoun Park; Man Suck Park; Kyu-Jam Hwang
- 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-α, INF-γ, 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-α and a 42 times higher level of IFN-γ than the respective levels at the early time points after infection. The levels of TNF-α and IFN-γ 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-α, IFN-γ, 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-γ, 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.
- Subjects
IMMUNE response; FRANCISELLA tularensis; VACCINES; CYTOKINES; MOUSE diseases
- Publication
Journal of Veterinary Science, 2008, Vol 9, Issue 3, p309
- ISSN
1229-845X
- Publication type
Article
- DOI
10.4142/jvs.2008.9.3.309