[Immune response to HBsAg can not be enhanced with B7-H1 protein vaccine]

To observe the immunization effect to HBsAg by B7-H1 protein vaccine in transgenic mice, and to explore new methods for the treatment of chronic hepatitis B.

After the joint immunization in HBV transgenic mice with different doses of hepatitis B virus (HBV) vaccine and B7-H1 protein, the anti-B7-H1 antibody titors, Th1 type of cytokines (IFN-γ and IL-2) from the spleen cells of mice, the number of the T cells secreting IFN-γ and the number of the mice lymphocyte proliferation were measrued by ELISA, ELISPOT and MTT technique respectively, to compare the immune effect of different immune methods and regimen.

The immune plans were completed successfully. The anti-B7-H1 antibody was detected in the fifth week after immunization with B7-H1 vaccine, at the same time no obvious difference of antibodies titors between groups were found. IL-2 and the number of T cells secreting IFN-γ were significantly reduced(P<0.05)in joint immunization group with B7-H1 protein and HBsAg, but no difference in other immune tests, such as IFN-γ, lymphocyte proliferation.

A lower doses of HBsAg can cause the secretion of Th1 type of cytokines and lymphocyte proliferation. B7-H1 protein vaccines have a better immunogetic effect for HBV transgenic mice, but can notupregulate the immune response to HBsAg.