Abstract
Interleukin 6 (IL-6) is an important pathogenic factor in development of various inflammatory and autoimmune diseases and cancer. Blocking antibodies against molecules associated with IL-6/IL-6 receptor signaling are an attractive candidate for the prevention or therapy of these diseases. In this study, we developed a genetically modified strain of Lactococcus lactis secreting a single-chain variable fragment antibody against mouse IL-6 (IL6scFv). An IL6scFv-secretion vector was constructed by cloning an IL6scFv gene fragment into a lactococcal secretion plasmid and was electroporated into L. lactis NZ9000 (NZ-IL6scFv). Secretion of recombinant IL6scFv (rIL6scFv) by nisin-induced NZ-IL6scFv was confirmed by western blotting and was optimized by tuning culture conditions. We found that rIL6scFv could bind to commercial recombinant mouse IL-6. This result clearly demonstrated the immunoreactivity of rIL6scFv. This is the first study to engineer a genetically modified strain of lactic acid bacteria (gmLAB) that produces a functional anti-cytokine scFv. Numerous previous studies suggested that mucosal delivery of biomedical proteins using gmLAB is an effective and low-cost way to treat various disorders. Therefore, NZ-IL6scFv may be an attractive tool for the research and development of new IL-6 targeting agents for various inflammatory and autoimmune diseases as well as for cancer.
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Acknowledgments
We are grateful to Yasuhiro Yasaki, Kohichi Sudo, and Fu Namai (Faculty of Agriculture, Shinshu University) for their excellent support in purification of recombinant proteins.
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This study was supported by a Grant-in-Aid for the Japan Society for the Promotion of Science Fellows (No. 14J06317) to SS and by a grant from Sumitomo Electric Industries Group CSR Foundation (No. 2012#7) to TSh.
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Shigemori, S., Ihara, M., Sato, T. et al. Secretion of an immunoreactive single-chain variable fragment antibody against mouse interleukin 6 by Lactococcus lactis . Appl Microbiol Biotechnol 101, 341–349 (2017). https://doi.org/10.1007/s00253-016-7907-8
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DOI: https://doi.org/10.1007/s00253-016-7907-8