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Analysis of erythrocyte surface recognition mechanism by Plasmodium falciparum Ripr

Research Project

Project/Area Number 19K16629
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 49040:Parasitology-related
Research InstitutionEhime University

Principal Investigator

NAGAOKA HIKARU  愛媛大学, プロテオサイエンスセンター, 研究員 (10757222)

Project Period (FY) 2019-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2020: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Fiscal Year 2019: ¥2,470,000 (Direct Cost: ¥1,900,000、Indirect Cost: ¥570,000)
Keywordsマラリア / ワクチン / モノクローナル抗体 / コムギ無細胞 / 小麦無細胞 / 赤血球表面受容体 / Malaria / blood stage / vaccine
Outline of Research at the Start

近年申請者らは、Riprに対する抗体が非常に高い原虫増殖阻害活性を示すこと、Riprが単独で赤血球結合能を有することを明らかにした。また抗原の最小化にも成功しており、増殖阻害活性に必須な約200アミノ酸(Ripr1-5)を同定した。本研究では、Ripr1-5のモノクローナル抗体を作出することで、Ripr分子の生理的役割を明らかにし、原虫の赤血球侵入機構の一端を解明することを目的とする。これにより、Riprを用いた赤血球期ワクチンのデザインに貢献することができる。

Outline of Final Research Achievements

Plasmodium falciparum malaria afflicts an estimated 205-316 million people annually, with an estimated 400,000 deaths. The development of a blood-stage vaccine against the disease is urgently needed. This research aimed to establish mouse monoclonal antibodies against the P. falciparum Ripr 1-5, a promising blood-stage vaccine target preventing merozoite invasion to the erythrocyte. The 11 monoclonal antibodies were selected from 51 clones by the reactivity to the cultured parasites using IFA. Then, we characterized the clones with SPR to reveal the affinity to PfRipr 1-5, and growth inhibition activity to the cultured parasites. In conclusion, we have established 4 monoclonal antibodies. The monoclonal are useful for quality control of PfRipr1-5 antigen in the development of the vaccine. Characterization of structural epitopes is essential for further study, identifying the mode of action of the antibodies and exploring the molecular mechanisms of merozoite invasion.

Academic Significance and Societal Importance of the Research Achievements

マラリアは、毎年2億人あまりが罹患し約40万人が死に至る感染症で、マラリアワクチンの実現は喫緊の課題である。近年我々は優れたワクチン候補分子であるRipr、そしてそのワクチン活性責任部位(Ripr1-5)を見出すことに成功し、現在Ripr1-5を抗原としたワクチンを前臨床開発中である。しかし依然として、Ripr1-5抗原のさらなる改良をする必要性は非常に高い。本研究で得られた4種類の抗Ripr1-5モノクローナル抗体の原虫侵入阻害を分子レベルに明らかにすることで、Riprの機能と構造、またRiprに関与するメロゾイト侵入メカニズムに立脚したワクチン開発が可能となり、マラリア撲滅を加速できる。

Report

(3 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • Research Products

    (6 results)

All 2021 2020 2019

All Journal Article (4 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 4 results,  Open Access: 3 results) Presentation (2 results) (of which Int'l Joint Research: 1 results)

  • [Journal Article] Leveraging the wheat germ cell-free protein synthesis system to accelerate malaria vaccine development2021

    • Author(s)
      Kanoi Bernard N.、Nagaoka Hikaru、Morita Masayuki、Tsuboi Takafumi、Takashima Eizo
    • Journal Title

      Parasitology International

      Volume: 80 Pages: 102224-102224

    • DOI

      10.1016/j.parint.2020.102224

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Characterization of a Plasmodium falciparum PHISTc protein, PF3D7_0801000, in blood- stage malaria parasites2021

    • Author(s)
      Nagaoka Hikaru、Kanoi Bernard N.、Morita Masayuki、Nakata Takahiro、Palacpac Nirianne M.Q.、Egwang Thomas G.、Horii Toshihiro、Tsuboi Takafumi、Takashima Eizo
    • Journal Title

      Parasitology International

      Volume: 80 Pages: 102240-102240

    • DOI

      10.1016/j.parint.2020.102240

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Antibodies against a short region of PfRipr inhibit Plasmodium falciparum merozoite invasion and PfRipr interaction with Rh5 and SEMA7A2020

    • Author(s)
      Nagaoka Hikaru、Kanoi Bernard N.、Ntege Edward H.、Aoki Masamitsu、Fukushima Akihisa、Tsuboi Takafumi、Takashima Eizo
    • Journal Title

      Scientific Reports

      Volume: 10 Issue: 1 Pages: 1-14

    • DOI

      10.1038/s41598-020-63611-6

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Global repertoire of human antibodies against Plasmodium falciparum RIFINs, SURFINs, and STEVORs in a malaria exposed population2020

    • Author(s)
      Kanoi Bernard N.、Nagaoka Hikaru、Morita Masayuki、White Michael T.、Palacpac Nirianne M.Q.、Ntege Edward H.、Balikagala Betty、Yeka Adoke、Egwang Thomas G.、Horii Toshihiro、Tsuboi Takafumi、Takashima Eizo
    • Journal Title

      Frontiers in Immunology

      Volume: "" Pages: 1-12

    • DOI

      10.3389/fimmu.2020.00893

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 熱帯熱マラリア原虫MSP10の赤血球侵入におけるメカニズムの解明2020

    • Author(s)
      長岡ひかる, カノイ・バーナード, 神岡花奈, 森田将之, 二リアン・パラクパック, 堀井 俊宏, 坪井敬文, 高島英造
    • Organizer
      第89回 日本寄生虫学会
    • Related Report
      2020 Annual Research Report
  • [Presentation] The N-terminal region of Plasmodium falciparum MSP10 is important for PfGAMA/MSP10 interaction and is a target of protective antibodies.2019

    • Author(s)
      Hikaru Nagaoka, Bernard N. Kanoi, Kana Jinoka, Masayuki Morita, Thangavelu U Arumugam, Nirianne M. Q. Palacpac, Thomas G. Egwang, Toshihiro Horii, Takafumi Tsuboi, Eizo Takashima
    • Organizer
      ASTMH 68th Annual Meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2022-01-27  

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