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Research Project

Project/Area Number 19K08357
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 52050:Embryonic medicine and pediatrics-related
Research InstitutionNational Institute of Infectious Diseases

Principal Investigator

Nojima Kiyoko  国立感染症研究所, 次世代生物学的製剤研究センター, 主任研究官 (60370970)

Project Period (FY) 2019-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
KeywordsHTLV-1 / 母子感染 / クローン解析 / 経胎盤感染 / ヒト化マウス
Outline of Research at the Start

本研究では、妊娠初期の超免疫不全マウスにヒト末梢血を移植した妊娠ヒト化マウスに、HTLV-1ウイルス感染細胞を移植して仔マウスを産ませることにより、HTLV-1 の母子感染モデルを構築し、HTLV-1感染細胞が仔マウスの胎盤へ移行するか、さらに感染細胞が胎盤バリアを突破して胎仔側へ移動するのか、どこで感染が起こり,感染細胞が潜伏するのか等を長期モニタすることにより、母子→胎児間での血液細胞、感染細胞の移行の実態や母子感染のメカニズムを明らかにする。

Outline of Final Research Achievements

Mother-to-child transmission of HTLV-1 occurs in 3-5% of cases even when switching to exclusive formula feeding, suggesting the possibility of transplacental or intrapartum transmission. There was a need for animal models to help elucidate the mechanism of mother-to-child transmission. In this study, we developed a mother-to-child infection model by HTLV-1 infected pregnant humanized mice, created by transplanting human peripheral blood into NOG mice. Clonal analysis of genomes derived from the placenta of pregnant mother mice and fetal liver revealed the presence of small number of common clones across all tissues. Small numbers of common clones were also in the blood and breast milk of infected nursing mother mice, as well as in the liver genomes of newborn mice, suggesting the possibility of de novo infection. This study mimics HTLV-1 mother-to-child transmission and is suggested to be useful for future therapeutic drug development.

Academic Significance and Societal Importance of the Research Achievements

ヒトT細胞白血病ウイルス (HTLV-1) は完全人工栄養乳に切り替えても、3-5%程度の母子感染が認められることから,経胎盤感染あるいは経産道感染の可能性が示唆されてきたが,感染機序の解明にはHTLV-1キャリアの出産後の胎盤や臍帯などの調査だけでは難しく,母子感染動物モデルの開発が望まれていた。我々は、妊娠初期のNOGマウスにヒト末梢血を移植しヒト化することで妊娠ヒト化マウスを作成後,HTLV-1感染細胞を移植することにより、母子感染モデルを構築し実験に用いた。本感染モデルは、胎生期におけるHTLV-1感染細胞の動態および感染機構の解明や治療薬開発等に役立てられると考えられる。

Report

(6 results)
  • 2023 Annual Research Report   Final Research Report ( PDF )
  • 2022 Research-status Report
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (4 results)

All 2022 2021 2019

All Presentation (4 results) (of which Int'l Joint Research: 1 results)

  • [Presentation] ヒト化マウスを用いた HTLV-1 母子感染モデルにおける感染クローン解析2022

    • Author(s)
      水上 拓郎, 野島清子, 関洋平, 石井美枝子, 今井恵子, 森内浩幸, 内丸薫, 明里宏文, 蕎麦田理英子, 佐竹正博, 浜口功
    • Organizer
      第8回日本HTLV-1学会
    • Related Report
      2022 Research-status Report
  • [Presentation] Parvovirus B19培養系の開発2021

    • Author(s)
      岡田義昭、野島清子
    • Organizer
      第68回ウイルス学会
    • Related Report
      2021 Research-status Report
  • [Presentation] Development of humanized mouse model for studying mother to child HTLV-1 transmission and prevention with HTLV-1 antibody treatment.2019

    • Author(s)
      Mizukami T, Nojima K, Sato Y, Furuhata K, Sasaki E, Matsuoka S, Okuma K, Moriuchi H, Uchimaru K, Akari H, Satake M, Hamaguchi I:
    • Organizer
      24th Congress of Europian Hematology Association
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] ヒト化マウスを用いたHTLV-1母子感染モデルの構築の試み2019

    • Author(s)
      水上拓郎,野島清子,佐藤結子,古畑啓子,松岡佐保子,大隈和,森内浩幸,内丸薫,明里宏文,蕎麦田理英子,佐竹正博,浜口功
    • Organizer
      第6回日本HTLV-1学会学術集会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2025-01-30  

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