数字农科院2.0

Bacterial ghosts engineered with lipidated antigens as an adjuvant-free vaccine for Chlamydia abortus

文献类型： 外文期刊

作者： Huaiyu Zhang;Wei Li;Yunhui Li;Yihan Wang;Youshun Jin;Dewen Tong;Zhaocai Li;Jizhang Zhou

作者机构：

关键词： Bacterial ghost;Chlamydia abortus;Lipoprotein;lpp’-ompA;Vaccine

期刊名称： International Journal of Pharmaceutics

ISSN： 0378-5173

年卷期： 2024 年 666 卷

页码：

收录情况： SCIE（2024版）

摘要： Bacterial ghosts (BGs) provide novel vaccine delivery platforms because of their inherent adjuvant properties and efficient antigen delivery capabilities. However, effective engineering strategies are required to modify them for different antigens. In this study, the Escherichia coli (E. coli) ghost was modified by using a lpp’-ompA chimera, a widely used bacterial surface display vector, with a protective antigen macrophage infectivity potentiator (MIP) of Chlamydia abortus (C. abortus), and its protective effect was evaluated in a mouse model. The MIP fusion protein accumulated at 1.2% of the ghost total protein mass and a significant portion of the protein was modified into lipoproteins upon translocation to the BG surface. Lipidated MIP-modified recombinant E. coli ghosts (rECG-lpp’-MIP) effectively promoted antigen-presenting cells (APCs) uptake of antigens and stimulated APCs activation in vivo and in vitro. Immunization with rECG-lpp’-MIP and no adjuvant induced intense specific humoral responses as well as Th1-biased cellular immune responses, which significantly improved the efficiency of C. abortus infection clearance in mice and reduced pathological damage to the uterus. In summary, this study demonstrates that recombinant E. coli ghosts modified with lipidated antigens could help to develop an effective C. abortus vaccine and aid in the development of a universal adjuvant-free vaccine platform.

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