Advax, a Delta Inulin Microparticle, Potentiates In-built Adjuvant Property of Co-administered Vaccines

Masayuki Hayashi, Taiki Aoshi, Yasunari Haseda, Kouji Kobiyama, Edward Wijaya, Noriyuki Nakatsu, Yoshinobu Igarashi, Daron M. Standley, Hiroshi Yamada, Yoshikazu Honda-Okubo, Hiromitsu Hara, Takashi Saito, Toshiyuki Takai, Cevayir Coban, Nikolai Petrovsky, Ken J. Ishii

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)
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Abstract

Advax, a delta inulin-derived microparticle, has been developed as an adjuvant for several vaccines. However, its immunological characteristics and potential mechanism of action are yet to be elucidated. Here, we show that Advax behaves as a type-2 adjuvant when combined with influenza split vaccine, a T helper (Th)2-type antigen, but behaves as a type-1 adjuvant when combined with influenza inactivated whole virion (WV), a Th1-type antigen. In addition, an adjuvant effect was not observed when Advax-adjuvanted WV vaccine was used to immunize toll-like receptor (TLR) 7 knockout mice which are unable to respond to RNA contained in WV antigen. Similarly, no adjuvant effect was seen when Advax was combined with endotoxin-free ovalbumin, a neutral Th0-type antigen. An adjuvant effect was also not seen in tumor necrosis factor (TNF)-α knockout mice, and the adjuvant effect required the presences of dendritic cells (DCs) and phagocytic macrophages. Therefore, unlike other adjuvants, Advax potentiates the intrinsic or in-built adjuvant property of co-administered antigens. Hence, Advax is a unique class of adjuvant which can potentiate the intrinsic adjuvant feature of the vaccine antigens through a yet to be determined mechanism.

Original languageEnglish
Pages (from-to)127-136
Number of pages10
JournalEBioMedicine
Volume15
DOIs
Publication statusPublished - Feb 2017
Externally publishedYes

Bibliographical note

This is an open access article under the CC BY-NC-ND license(http://creativecommons.org/licenses/by-nc-nd/4.0/).

Keywords

  • Adjuvant
  • Inulin
  • Macrophage
  • Particle
  • Vaccine

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