Objective To investigate the level of follicular helper T (Tfh) cells in the peripheral blood and spleen of the host after Echinococcus multilocularis infection and its association with the progression of echinococcosis.Methods A total of 20 Sprague-Dawley rats were randomly divided into normal control group and model group, with 10 rats in each group. The rats in the model group were inoculated with about 2000 protoscoleces in the right liver under direct-view laparotomy, and those in the control group were not given any treatment. The rats were anesthetized and sacrificed after 3 months to collect peripheral blood and spleen cells, and with CD4+CXCR5+PD1+ as the marker of Tfh cells, flow cytometry was used to measure the level of Tfh cells in peripheral blood and spleen. The t-test was used for comparison of Tfh cells between the two groups.Results After 3 months of Echinococcus multilocularis infection, marked lesions were observed in the liver, and HE staining showed the presence of protoscoleces in the lesions. The proportion of CD4+CXCR5+PD1+Tfh cells in CD4+ cells in peripheral blood was 25.63%±3.47% in the model group and 11.12%±2.94% in the normal control group (t=10.230, P < 0.001), a nd the model group had a significantly lower proportion of CD4+CXCR5+PD1+Tfh cells in all cells than the normal control group (0.08%±0.02% vs 0.18%±0.05%, t=5.520, P < 0.001). For the model group, the proportion of CD4+CXCR5+PD1+Tfh cells in all cells in the spleen decreased to 3.00%±0.42%, which was significantly lower than the proportion of 5.30%±1.40% in the normal control group (t=4.769, P < 0.001).Conclusion Tfh cells in peripheral blood are closely associated with the progression of echinococcosis and are expected to become an indicator of Echinococcus multilocularis infection.
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