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Korean Society for Biochemistry and Molecular Biology (생화학분자생물학회)
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Expression of Cholera Toxin B Subunit and Assembly as Functional Oligomers in Silkworm

  • Gong, Zhao-Hui (Institute of Biochemistry, College of Life Sciences, Zhejiang University) ;
  • Jin, Hui-Qing (Institute of Biochemistry, College of Life Sciences, Zhejiang University) ;
  • Jin, Yong-Feng (Institute of Biochemistry, College of Life Sciences, Zhejiang University) ;
  • Zhang, Yao-Zhou (Institute of Biochemistry, College of Life Sciences, Zhejiang Sci-Tech University)
  • Published : 2005.11.30
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Abstract

The nontoxic B subunit of cholera toxin (CTB) can significantly increase the ability of proteins to induce immunological tolerance after oral administration, when it was conjugated to various proteins. Recombinant CTB offers great potential for treatment of autoimmune disease. Here we firstly investigated the feasibility of silkworm baculovirus expression vector system for the cost-effective production of CTB under the control of a strong polyhedrin promoter. Higher expression was achieved via introducing the partial non-coding and coding sequences (ATAAAT and ATGCCGAAT) of polyhedrin to the 5' end of the native CTB gene, with the maximal accumulation being approximately 54.4 mg/L of hemolymph. The silkworm bioreactor produced this protein vaccine as the glycoslated pentameric form, which retained the GM1-ganglioside binding affinity and the native antigenicity of CTB. Further studies revealed that mixing with silkworm-derived CTB increases the tolerogenic potential of insulin. In the nonconjugated form, an insulin : CTB ratio of 100 : 1 was optimal for the prominent reduction in pancreatic islet inflammation. The data presented here demonstrate that the silkworm bioreactor is an ideal production and delivery system for an oral protein vaccine designed to develop immunological tolerance against autoimmune diabetes and CTB functions as an effective mucosal adjuvant for oral tolerance induction.

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References

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