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Do malaria parasites control host cells via LISP2 protein translocated to the host nuclei?

Research Project

Project/Area Number 18K19454
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 49:Pathology, infection/immunology, and related fields
Research InstitutionEhime University

Principal Investigator

Ishino Tomoko  愛媛大学, プロテオサイエンスセンター, 准教授 (40402680)

Project Period (FY) 2018-06-29 – 2020-03-31
Project Status Completed (Fiscal Year 2019)
Budget Amount *help
¥6,370,000 (Direct Cost: ¥4,900,000、Indirect Cost: ¥1,470,000)
Fiscal Year 2019: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2018: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Keywordsマラリア / 肝臓ステージ / マラリア原虫 / 肝細胞寄生 / LISP2 / 肝細胞
Outline of Final Research Achievements

We generated liver stage specific protein 2 (LISP2) disrupted transgenic parasites expressing GFP constitutively in Plasmodium berghei. The infectivity of LISP2-KO sporozoites to mice was 20 to 50-fold less than that of wild-type. Wild-type or LISP2-KO parasite-infected HepG2 cells were successfully purified by flow cytometry at 36 h post sporozoite inoculation. This strategy will be useful to screen host molecules which are affected by LISP2 expression. We also detected LISP2 expression in the liver-stage parasites of Plasmodium vivax and Plasmodium cynomolgi, in which hypnozoites, dormant forms in hepatocytes, cause the relapse. By using anti-PvLISP2 antibodies, it was revealed that LISP2 expression correlates to the re-entry of proliferation phase in hepatocytes.

Academic Significance and Societal Importance of the Research Achievements

蚊によって媒介されるマラリア原虫は、哺乳類体内で初めに肝細胞に寄生し、短期間のうちに数万倍の赤血球感染型へと増殖分化する。従って、肝細胞ステージが感染阻止法の最適なターゲットと言える。しかしながら肝細胞内での原虫発育機構については不明なまま残されている。本研究は、肝細胞ステージ特異的に発現し、宿主細胞核へと移行するLISP2を足がかりに、マラリア原虫による宿主細胞改変メカニズムを解析しようとするものである。さらに、肝内休眠型というユニークなステージを経る為に対策が困難であった三日熱マラリア原虫においても、LISP2の発現を確認し、これが増殖期への移行と相関することを示した。

Report

(3 results)
  • 2019 Annual Research Report   Final Research Report ( PDF )
  • 2018 Research-status Report
  • Research Products

    (6 results)

All 2019 2018 Other

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

  • [Int'l Joint Research] Novartis Institute for Tropical Diseases/Center for Infectious Disease Research(米国)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] The Plasmodium liver-specific protein 2 (LISP2) is an early marker of liver stage development2019

    • Author(s)
      Devendra Kumar Gupta, Laurent Dembele, Annemarie Voorberg-van der Wel, Guglielmo Roma, Andy Yip, Vorada Chuenchob, Niwat Kangwanrangsan, Tomoko Ishino, Ashley M Vaughan, Stefan H Kappe, Erika L Flannery, Jetsumon Sattabongkot, Sebastian Mikolajczak, Pablo Bifani, Clemens HM Kocken, Thierry Tidiane Diagana
    • Journal Title

      eLife

      Volume: 8

    • DOI

      10.7554/elife.43362

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] The role of RON4 in Plasmodium sporozoite infection of the liver2019

    • Author(s)
      Minami Baba, Mamoru Nozaki, Motomi Torii, Tomoko Ishino
    • Organizer
      67th Annual meeting of American Society of Tropical Medicine & Hygene
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research
  • [Presentation] スポロゾイトにおけるロプトリータンパク質群の網羅的機能解析2018

    • Author(s)
      石野智子
    • Organizer
      分子寄生虫学フォーラム
    • Related Report
      2018 Research-status Report
  • [Remarks] プロテオサイエンスセンター 寄生病原体学部門

    • URL

      https://www.m.ehime-u.ac.jp/school/parasitology/

    • Related Report
      2019 Annual Research Report
  • [Remarks] 愛媛大学 プロテオサイエンスセンター 寄生病原体学部門

    • URL

      https://www.m.ehime-u.ac.jp/school/parasitology/

    • Related Report
      2018 Research-status Report

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Published: 2018-07-25   Modified: 2021-02-19  

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