Secretory IgA-mediated protection against V. cholerae and heat-labile enterotoxin-producing enterotoxigenic Escherichia coli by rice-based vaccine

Daisuke Tokuhara, Yoshikazu Yuki, Tomonori Nochi, Toshio Kodama, Mio Mejima, Shiho Kurokawa, Yuko Takahashi, Masanobu Nanno, Ushio Nakanishi, Fumio Takaiwa, Takeshi Honda, Hiroshi Kiyono

Research output: Contribution to journalArticlepeer-review

79 Citations (Scopus)

Abstract

Cholera and enterotoxigenic Escherichia coli (ETEC) are among the most common causes of acute infantile gastroenteritis globally. We previously developed a rice-based vaccine that expressed cholera toxin B subunit (MucoRice-CTB) and had the advantages of being cold chain-free and providing protection against cholera toxin (CT)-induced diarrhea. To advance the development of MucoRice-CTB for human clinical application, we investigatedwhether the CTB-specific secretory IgA (SIgA) induced by MucoRice-CTB gives longstanding protection against diarrhea induced by Vibrio cholerae and heatlabile enterotoxin (LT)-producing ETEC (LT-ETEC) inmice. Oral immunization with MucoRice-CTB stored at room temperature for more than 3 y provided effective SIgA-mediated protection against CT- or LT-induced diarrhea, but the protectionwas impaired in polymeric Ig receptor-deficient mice lacking SIgA. The vaccine gave longstanding protection against CT- or LT-induced diarrhea (for ≥6 months after primary immunization), and a single booster immunization extended the duration of protective immunity by at least 4 months. Furthermore, MucoRice-CTB vaccination prevented diarrhea in the event of V. cholerae and LT-ETEC challenges. Thus, MucoRice-CTB is an effective long-term cold chain-free oral vaccine that induces CTB-specific SIgA-mediated longstanding protection against V. cholerae-or LT-ETEC-induced diarrhea.

Original languageEnglish
Pages (from-to)8794-8799
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume107
Issue number19
DOIs
Publication statusPublished - 2010 May 11

Keywords

  • Cholera toxin B subunit
  • MucoRice
  • Mucosal vaccine
  • Oral vaccine
  • Plant-made vaccine

ASJC Scopus subject areas

  • General

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