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Development of sublingual mucosal vaccine adjuvant for neonates and infants

Research Project

Project/Area Number 16K10039
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Pediatrics
Research InstitutionOsaka City University

Principal Investigator

TOKUHARA DAISUKE  大阪市立大学, 大学院医学研究科, 講師 (60448751)

Research Collaborator HIKITA norikatsu  
TACHIBANA daisuke  
CHO yuki  
Project Period (FY) 2016-04-01 – 2019-03-31
Project Status Completed (Fiscal Year 2018)
Budget Amount *help
¥4,810,000 (Direct Cost: ¥3,700,000、Indirect Cost: ¥1,110,000)
Fiscal Year 2018: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2017: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2016: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywordsワクチン / アジュバント / 感染症 / 小児 / 臍帯血 / 自然免疫 / Toll様受容体 / zymosan / ノロウイルス / 免疫学
Outline of Final Research Achievements

Human cord blood and adult peripheral blood monocytes were isolated and stimulated with lipopolysaccharide (TLR4 agonist) or zymosan (TLR2/6 agonist). Expression levels of MHC-class II, CD80, CD86, CD11b, CD11c, CD14, and CD16 were evaluated. Cord blood CD14+CD16high monocytes showed significantly lower levels of basal expression of MHC-class II, CD80, and CD11b compared with those of adult CD14+CD16intermediate monocytes. The ratios of lipopolysaccharide-stimulated expression levels to basal levels for MHC-class II, CD80, and CD11b and the ratios of zymosan-stimulated expression levels to basal levels for MHC-class II, CD86, CD11b, and CD11c were significantly higher in cord blood monocytes than in adult blood monocytes. Despite showing selective impairment of basal expression of surface antigens, neonatal monocytes are hyperresponsive to TLR stimulation compared with adult. Application of TLR agonists may complement induction of protective immunity as a vaccine adjuvant in children.

Academic Significance and Societal Importance of the Research Achievements

現在のワクチンは健常成人や成熟マウスにおける効果をもとに開発され、乳幼児に応用されている。しかし乳幼児はそれらのワクチンによる免疫誘導効果が低く、成人よりも複数回の接種を必要とする。その問題点を克服するためには、成熟した免疫システムを対象にしたワクチンの開発ステップを見直す必要があり、乳幼児免疫の理解に立脚したワクチン開発が望ましい。しかし、乳幼児から研究用に血液を採取することは侵襲性が高いため、我々は痛みを伴わずに採取できる臍帯血を用いた解析を展開している。本研究成果はヒト臍帯血から得られるため、動物実験や成人で得られた結果よりもシームレスに乳幼児に特化したワクチン開発への応用が期待できる。

Report

(4 results)
  • 2018 Annual Research Report   Final Research Report ( PDF )
  • 2017 Research-status Report
  • 2016 Research-status Report
  • Research Products

    (5 results)

All 2019 2018 Other

All Int'l Joint Research (1 results) Journal Article (2 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 2 results,  Open Access: 1 results) Presentation (2 results)

  • [Int'l Joint Research] カリフォルニア大学サンディエゴ校(米国)

    • Related Report
      2018 Annual Research Report
  • [Journal Article] A comprehensive understanding of the gut mucosal immune system in allergic inflammation2019

    • Author(s)
      Tokuhara Daisuke、Kurashima Yosuke、Kamioka Mariko、Nakayama Toshinori、Ernst Peter、Kiyono Hiroshi
    • Journal Title

      Allergology International

      Volume: 68 Issue: 1 Pages: 17-25

    • DOI

      10.1016/j.alit.2018.09.004

    • NAID

      130007557958

    • ISSN
      1323-8930, 1440-1592
    • Related Report
      2018 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Challenges in developing mucosal vaccines and antibodies against infectious diarrhea in children2018

    • Author(s)
      Daisuke Tokuhara
    • Journal Title

      Pediatrics International

      Volume: 60 Issue: 3 Pages: 214-223

    • DOI

      10.1111/ped.13497

    • NAID

      120006652520

    • URL

      https://ocu-omu.repo.nii.ac.jp/records/2020355

    • Related Report
      2017 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 乳幼児に特化した次世代型ノロウイルスワクチンの開発2019

    • Author(s)
      徳原大介
    • Organizer
      第122回日本小児科学会学術集会(金沢)
    • Related Report
      2018 Annual Research Report
  • [Presentation] 臍帯血由来単球におけるTLRを介した自然免疫応答の解析2019

    • Author(s)
      匹田典克、徳原大介
    • Organizer
      第122回日本小児科学会学術集会(金沢)
    • Related Report
      2018 Annual Research Report

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Published: 2016-04-21   Modified: 2021-01-27  

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