RNAi suppression of rice endogenous storage proteins enhances the production of rice-based Botulinum neutrotoxin type A vaccine

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• 作者：Yoshikazu Yuki^a ; ^{yukiy@ims.u-tokyo.ac.jp} ; Mio Mejima^a ; Shiho Kurokawa^a ; Tomoko Hiroiwa^a ; Il Gyu Kong^a ; Masaharu Kuroda^b ; Yoko Takahashi^a ; Tomonori Nochi^a ; Daisuke Tokuhara^a ; Tomoko Kohda^c ; Shunji Kozaki^c ; Hiroshi Kiyono^a
• 关键词：Ab ; antibody ; BoHc ; a nontoxic subunit fragment of Clostridium botulinum type-A neurotoxin ; BoNT/A ; C. botulinum neurotoxin type-A ; CT ; cholera toxin ; CTB ; cholera toxin B-subunit ; ELISA ; Enzyme-linked immunosorbent assay ; ER ; endoplasmic reticulum ; LPS
• 刊名：Vaccine
• 出版年：2012
• 期刊代码：89_0264410x
• 类别：imm
• 出版时间：13 June, 2012
• 卷：30
• 期：28
• 页码：4160-4166
• 文件大小：1014 K

摘要

Mucosal vaccines based on rice (MucoRice) offer a highly practical and cost-effective strategy for vaccinating large populations against mucosal infections. However, the limitation of low expression and yield of vaccine antigens with high molecular weight remains to be overcome. Here, we introduced RNAi technology to advance the MucoRice system by co-introducing antisense sequences specific for genes encoding endogenous rice storage proteins to minimize storage protein production and allow more space for the accumulation of vaccine antigen in rice seed. When we used RNAi suppression of a combination of major rice endogenous storage proteins, 13 kDa prolamin and glutelin A in a T-DNA vector, we could highly express a vaccine comprising the 45 kDa C-terminal half of the heavy chain of botulinum type A neurotoxin (BoHc), at an average of 100 渭g per seed (MucoRice-BoHc). The MucoRice-Hc was water soluble, and was expressed in the cytoplasm but not in protein body I or II of rice seeds. Thus, our adaptation of the RNAi system improved the yield of a vaccine antigen with a high molecular weight. When the mucosal immunogenicity of the purified MucoRice-BoHc was examined, the vaccine induced protective immunity against a challenge with botulinum type A neurotoxin in mice. These findings demonstrate the efficiency and utility of the advanced MucoRice system as an innovative vaccine production system for generating highly immunogenic mucosal vaccines of high-molecular-weight antigens.