Assessment of the immune responses to Treponema pallidum Gpd DNA vaccine adjuvanted with IL-2 and chitosan nanoparticles before and after Treponema pallidum challenge in rabbits

作者：Zhao FeiJun; Zhang XiaoHong; Liu ShuangQuan; Zeng TieBing; Yu Jian; Gu WeiMing; Zhang YueJun; Chen Xi; Wu YiMou^*

来源：Science China Life Sciences, 2013, 56(2): 174-180.

DOI：10.1007/s11427-012-4434-4

• Treponema pallidum (Tp)
• membrane protein
• Gpd
• CS
• IL-2
• nucleic acid vaccine

Syphilis is a multistage, sexually transmitted disease caused by the spirochete, Treponema pallidum (Tp). A significantly high incidence of syphilis has been reported in several countries, including China, and there is an urgent need for the development of efficacious vaccines against syphilis. DNA vaccines are a major breakthrough in the field of vaccination with several advantages over traditional vaccines. Animal model studies of Tp DNA vaccines have not been reported elsewhere but our previous reports describe the development of a single-gene Tp DNA vaccine and preclinical immunization study. In this study, chitosan (CS) nanoparticles were used as a vector and an interleukin-2 expression plasmid (pIL-2) as an adjuvant to enhance a TpGpd DNA vaccine candidate (pTpGpd) in a rabbit Tp skin challenge model. At week 8 after the first immunization, three rabbits from each group were used to determine cytokine measurements and spleen lymphocyte proliferation assay. pTpGpd in combination with pIL-2 wrapped with CS led to the greatest enhancement of anti-TpGpd antibodies and T-cell proliferation. During infection, levels of anti-TpGpd antibodies and T-cell proliferation were measured. Both the serum special IgG and IL-2, interferon-gamma were significantly increased by the co-injection of the IL-2 plasmid compared with the injection of TpGpd DNA alone (P < 0.05). Furthermore, IL-2 plasmid coinjection efficiently enhanced the antigen-specific lymphocyte proliferation response. Additionally, the ratios of positive skin lesions and ulcer lesions in groups immunized with pTpGpd were significantly lower than those of the pIL-2, CS or pIL-2 mixed with CS control groups (P < 0.001). CS vectored and pIL-2 adjuvanted pTpGpd immunized animals exhibited the lowest rates of positive skin tests (8.33%) and ulcer lesions (4.17%) and the fastest recovery (42 d). These experiments indicate that co-injection of a pIL-2 plasmid with pTpGpd DNA vaccine wrapped with CS can significantly strengthen the long-term stability of immune response during infection, efficiently improve the protective effect against T. pallidum spirochetes infection and attenuate syphilitic lesion development.

• 出版日期2013-2
• 单位中国疾病预防控制中心; 南华大学