经口感染弓形虫小鼠小肠IgA分泌细胞及抗体水平动态变化
[Abstract]:Objective To observe the dynamic distribution of Toxoplasma gondii tachyzoites in intestinal tissues and parenchymal organs of mice infected by oral infection and explore the mechanism of Toxoplasma gondii infection. To observe the dynamic changes of antibody secreting cells and antibody levels induced by STAg intranasal immunization in mice, and to explore the role of STAg intranasal immunization in the mucosal immune response to Toxoplasma gondii infection.
Methods 96 BALB/c mice were randomly selected and 12 mice were given 0.5 ml/PBS (control group). The remaining mice were given RH strain of Toxoplasma gondii tachyzoites 1 *10~4. Twelve mice were sacrificed at random 2, 4, 6, 8, 10, 12 and 14 days after infection. Duodenum, jejunum, ileum, liver, spleen, kidney, lung, heart and brain were taken for tissue imprinting, Gi-Rayleigh staining and microscopic examination. The number of IgA secreting cells in duodenum, jejunum and ileum was detected by immunohistochemistry, and the levels of IgA in intestinal fluid and serum IgG and IgA were determined by ELISA.
96 BABL/c mice aged 5-6 weeks were randomly divided into immunization group and control group.The immunization group was immunized with 20 UG of STAg by nasal drip twice at intervals of 2 weeks.The control group was immunized with 20 UG of PBS instead.One week after the last immunization,the mice were attacked by gastric lavage with 1 6550 On the 9th, 10th and 11th day, 8 mice in the immune group and 8 mice in the control group were sacrificed respectively after cervical dislocation.
Results Insects were found in the duodenum, jejunum, ileum, lung and heart 2 days after infection, 4 days in the spleen, 6 days in the kidney and liver, but not in the brain. Maintain a high level; during the experiment, the number of kidney, lung and heart worms remained at a low level.
The number of IgA secreting cells in the duodenal mucosa increased with the passage of time after infection. The number of IgA secreting cells in the jejunal mucosa increased 2-8 days after infection, and then decreased to the pre-infection water 14 days after infection. The number of IgA secreting cells in the ileal mucosa increased from 2 to 6 days after infection, then decreased to below the pre-infection level at 12 days after infection. After infection, the IgA level in the small intestinal fluid continued to increase, while the serum IgA remained unchanged. The correlation between the number of IgA secreting cells in the duodenum, jejunum and ileum and the IgA level in the small intestinal fluid was r=0.732 (P<0.732). .001), r=0.116 (P=0.455) and r=-0.429 (P < 0.005).
The changes of intestinal IgA secretory cells in STAg intranasal immunized mice were as follows: in duodenal mucosa, IgA secretory cells increased gradually with the days of infection; in jejunum and ileum mucosa, IgA secretory cells increased first and then decreased with the days of infection; in the control group, IgA secretory cells in ileum mucosa for 11 days were lower than 6 days; in the other 11 days, IgA secretory cells in the immunized group were higher than those in the control group, but there was no statistical significance. The IgA of the small intestine flushing fluid decreased on the 7th day, then increased slowly in the immune group, and then stabilized in the control group. The serum IgA decreased first, then increased and then decreased; the trend of serum IgG was stable; the immune group was always higher than the control group, and there was no significant difference in the indexes between the two groups (P < 0.05).
Conclusion A large number of tachyzoites appeared in the small intestine 2 days after oral infection of Toxoplasma gondii, and a small number of tachyzoites were found in the lungs and hearts; worms were found in the spleen 4 days after infection and in the kidney and liver 6 days after infection; tachyzoites proliferated in the above tissues and formed pseudocysts, but no worms were found in the brain.
Toxoplasma gondii oral infection can induce the high level expression of IgA secreting cells in duodenum and the high level of IgA secreting cells in intestinal fluid.
STAg intranasal immunization could induce high expression of IgA secreting cells in the lamina propria of duodenum, and elevate the levels of IgA in intestinal fluid and serum, suggesting that STAg might play a role in the anti-Toxoplasma gondii infection.
【学位授予单位】:山西医科大学
【学位级别】:硕士
【学位授予年份】:2008
【分类号】:R392
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