Relationship between type 1/type 2 immune responses and occurrence of vertical transmission in BALB/c mice infected with Neospora caninum
- 作者：Kano ; R. ; Masukata ; Y. ; Omata ; Y. ; Kobayashi ; Y. ; Maeda ; R. ; Saito ; A.
- 关键词：Immune regulation ; Neospora caninum ; Vertical transmission
- 刊名：Veterinary Parasitology
- 出版年：2005
- 期刊代码：107_03044017
- 类别：abs
- 出版时间：April 20, 2005
- 卷：129
- 期：1-2
- 页码：159-164
- 文件大小：173 K
摘要
To examine the relationship between occurrence of vertical transmission and type 1/type 2 immune responses induced by Neospora caninum infection in BALB/c mice, pregnant (group 1p) and non-pregnant mice (group 1np) were inoculated with 2 × 106 of the N. caninum parasites and then we examined the vertical transmission rate and production of IFN-γ and IL-4. We also studied chronically infected mice, which were bred at 4 weeks or more after infection (group 2), and mice inoculated during pregnancy and re-bred at 4 weeks or more after delivery (group 3). In groups 1p, 2 and 3, vertical transmission was observed in 27.4, 41.4, and 50%of the offspring, respectively. The serum IFN-γ level increased on days 1 and 5 post-inoculation (p.i.) in groups 1p and 1np, while no increase level was observed in groups 2 and 3 during pregnancy or after delivery. When the mice in groups 2 and 3 were re-inoculated, all mice showed a transient increase in serum IFN-γ on day 1 post-re-inoculation. The serum IL-4 level in both of groups 1p and np increased in a similar manner following infection. In group 3, the serum IL-4 level was somewhat higher than that in group 2 after re-inoculation. The anti-N. caninum antibody IgG1 titer in group 3 increased on day 10 post-re-inoculation. These results suggest that the mice infected during pregnancy may acquire a weaker immune response to the parasite than mice infected when they are not pregnant, and that mice infected during pregnancy may show an enhanced type 2 immune response in the recrudescence of the infection.