Abstract
Development and application of safe and effective mucosal adjuvants are important to improve immunization efficiency in oral vaccine. Here, we report a novel mucosal adjuvant, IL-6-CKS9, a recombinant cytokine generated by conjugating an M cell-targeting peptide (CKS9) with c-terminus of the murine interleukin 6 (IL-6), which facilitated enhancement of mucosal immune response. Lactococcus lactis IL1403, a food-grade strain of lactic acid bacteria (LAB) which is widely used in dairy industry, was used as a host cell to express and secrete the IL-6-CKS9 for a mucosal vaccine adjuvant. The recombinant L. lactis IL1403 secreting IL-6-CKS9 was orally administered with a model antigen protein, M-BmpB (Brachyspira membrane protein B conjugated with CKS9), to BALB/c mice for mucosal immunization. ELISA analyses showed consistent enhancement tendencies in induction of anti-M-BmpB antibody levels both with mucosal (IgA) and systemic (IgG) immune responses in IL-6-CKS9-LAB treated group compared with other groups tested by conducting two separated mice immunization assays. In addition, we characterized that the oral administration of model protein antigen with live LAB producing IL-6-CKS9 could induce both Th1 and Th2 type immune response...Continue Reading
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