结核复合抗原疫苗不同抗原组合对小鼠免疫功能的影响

Objective To study the immune function of mice immunized by different combinations of antigen 85b ( Ag85b), fusion protein culture filtered protein 10 ( CFP-10), early secreted antigenic target 6 kDa protein (ESAT-6) and heat shock protein X (Hsp X) with combined adjuvants of Bacille CalmetteGuerin (BCG) CpG and aluminum.Methods According to antigen combinations, 48 BALB/c mice were divided into 8 groups: ( 1 ) group A: Ag85b + CFP-10/ESAT-6 + HspX + adjuvant; (2) group B: CFP-10/ESAT-6 + HspX + adjuvant; ( 3 ) group C: Ag85b + HspX + adjuvant; (4) group D: Ag85b + CFP-10/ESAT-6 + adjuvant; (5) group E: Ag85b + adjuvant; (6) group F: CFP-10/ESAT-6 +adjuvant; (7)group G: HspX + adjuvants; (8) control group: saline (6 mice per group).The mice were subcutaneously immunized 3 times.One week after the third subcutaneous immunization, spleens were collected for enzymelinked immunospot (ELISPOT) assay to detect IFN-γ and IL-4 secretion, and for the lymphocyte proliferation assay to observe antigen-specific lymphocyte proliferation.Serum samples were separated for enzyme-linked immunosorbent assay (ELISA) to detect the titers of antigen-specific IgG, IgG1 and IgG2a antibodies.Results The amount of IFN-γ spots in Group E [median ( quartile), 122.8 (78.4 - 184.4 )]was significantly more than that in group C [14.3 (6.5 - 14.6)] and the control group [0.5 (0.5 - 1.3)](u =0.0, P ＜ 0.01 ).The amount of IL-4 spots in Group D stimulated with Ag85b and CFP-10/ESAT-6 [173.5 (78.8 -233.4), 132.8 ( 50.3 - 159.4)] were significantly more than those in the control group [0.5 (0.5 - 1.3 ), 5.3 ( 2.9 - 6.5 )] ( u = 0.0, P ＜ 0.01 ).The level of stimulation index of lymphocyte proliferation in Group A, C, D, E(2.42 ±0.50, 2.18 ±0.37, 2.86 ±0.51, 2.70 ±0.15) was significantly higher than that of the control group ( 1.11 ± 0.13 ) ( F= 20.96, P ＜ 0.01 ).The level of antigen-specific IgG, IgG1 , IgG2a antibody titers induced by Hsp X [lg( antibody dilution degree), 3.90 -5.21] was significantly higher than those induced by Ag85b (3.30-4.51 ) and CFP-10/ESAT-6 (3.10 -4.05) ( F = 63.8 - 70.4, P ＜ 0.01 ) .Conclusions With the use of adjuvants, different antigen combinations showed different influences on the immune function in mice.A combination of 3 antigens did not elicit the best immune effect, suggesting that the interaction among antigens may affect their immunity.

The effect of various antigen compounds of tuberculosis composite antigen vaccine on the immune function in mice