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Vaccination is critical for population protection from pathogenic infections. However, its efficiency is frequently compromised by a failure of antigen retention and presentation. Herein, we designed a dextran-binding protein DexBP, which is composed of the carbohydrate-binding domains of Trichoderma reesei cellobiohydrolases Cel6A and Cel7A, together with the sequence of the fluorescent protein mCherry. DexBP was further prepared by engineered Escherichia coli cells and grafted to magnetic nanoparticles. The magnetic nanoparticles were integrated with a dextran/poly(vinyl alcohol) framework and a reactive oxygen species-responsive linker, obtaining magnetic polymeric microgels for carrying pathogen antigen. Similar to amoeba aggregation, the microgels self-assembled to form aggregates and further induced dendritic cell aggregation. This step-by-step assembly retained antigens at lymph nodes, promoted antigen presentation, stimulated humoral immunity, and protected the mice from life-threatening systemic infections. This study developed a magnetic microgel-assembling platform for dynamically regulating immune response during protection of the body from dangerous infections.
Vaccination is critical for population protection from pathogenic infections. However, its efficiency is frequently compromised by a failure of antigen retention and presentation. Herein, we designed a dextran-binding protein DexBP, which is composed of the carbohydrate-binding domains of Trichoderma reesei cellobiohydrolases Cel6A and Cel7A, together with the sequence of the fluorescent protein mCherry. DexBP was further prepared by engineered Escherichia coli cells and grafted to magnetic nanoparticles. The magnetic nanoparticles were integrated with a dextran/poly(vinyl alcohol) framework and a reactive oxygen species-responsive linker, obtaining magnetic polymeric microgels for carrying pathogen antigen. Similar to amoeba aggregation, the microgels self-assembled to form aggregates and further induced dendritic cell aggregation. This step-by-step assembly retained antigens at lymph nodes, promoted antigen presentation, stimulated humoral immunity, and protected the mice from life-threatening systemic infections. This study developed a magnetic microgel-assembling platform for dynamically regulating immune response during protection of the body from dangerous infections.
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This work was supported by the National Natural Science Foundation of China (Nos. 3217010793 and 31870139), Tianjin Synthetic Biotechnology Innovation Capacity Improvement Project (No. TSBICIP-KJGG-006), the Natural Science Foundation of Tianjin (No. 19JCZDJC33800), and the Fundamental Research Funds for the Central Universities.