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  • Title: [Immune response and protective efficacy induced by fusion protein ESAT6-CFP10 of M.tuberculosis in mice].
    Author: Zhang H, Shi CH, Xue Y, Bai YL, Wang LM, Xu ZK.
    Journal: Xi Bao Yu Fen Zi Mian Yi Xue Za Zhi; 2006 Jul; 22(4):443-6. PubMed ID: 16806004.
    Abstract:
    AIM: To study murine humoral and cellular immune response induced by fusion protein ESAT6-CFP10 and to examine its protective efficacy against M. tuberculosis (MTB) in mice. METHODS: BALB/c mice were immunized subcutaneously on the back with fusion protein ESAT6-CFP10 that was transferred to nitro cellulose (NC) membrane beforehand. Stimulation index (SI) of the spleen lymphocytes of the immunized mice was measured by MTT colorimetry. The level of IFN-gamma and IL-2 and CTL upon antigen-specific stimulation were detected. The vaccinated BALB/c mice were intravenously infected with MTB H37Rv (10(5) CFU/mouse). Four weeks later the number of CFU in spleens was determined. RESULTS: The titer of serum specific antibody in BALB/c mice immunized with fusion protein ESAT6-CFP10 was 1:6,400. The SI of fusion protein immunized group (1.90+/-0.15) was significantly higher than that of saline-immunized group (0.9+/-0.15). The level of IFN-gamma and IL-2 induced by the fusion protein was 1.792+/-19 ng/L and 0.211+/-11 ng/L respectively, which was significantly higher than that of saline-immunized group and lower than that of BCG-immunized group. The specific killing activity of splenocytes was 36%. Compared with the saline-immunized mice (bacterial load was 6.51+/-0.13), MTB number (bacterial load was 5.24+/-0.15) was reduced dramatically in the spleens of BALB/c mice immunized with the fusion protein, but the protective efficacy of the mice immunized with BCG was higher than that of ESAT6-CFP10 vaccinated group. CONCLUSION: Fusion protein ESAT6-CFP10 can be used as a candidate for novel vaccines.
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