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Mechanistic analysis of hepatitis B virus infection focusing on vesicle trafficking system and its clinical application

Research Project

Project/Area Number 19K08385
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 53010:Gastroenterology-related
Research InstitutionTohoku University

Principal Investigator

Inoue Jun  東北大学, 大学病院, 助教 (60455821)

Co-Investigator(Kenkyū-buntansha) 嘉数 英二  東北大学, 医学系研究科, 大学院非常勤講師 (20509377)
岩田 朋晃  東北大学, 医学系研究科, 非常勤講師 (30803647)
二宮 匡史  東北大学, 高度教養教育・学生支援機構, 助教 (70583938)
Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
KeywordsHBV / 小胞輸送 / Rab5B / CD63 / B型慢性肝炎 / Rabタンパク質 / B型肝炎ウイルス / ウイルス性肝炎
Outline of Research at the Start

B型肝炎ウイルス(HBV)は感染肝細胞において侵入、複製、放出に至る生活環を形成している。本研究では、1.感染性HBV粒子の新規定量法の確立、2. HBV粒子形成・放出(生活環後期)における輸送機構の解明、3. HBV感染成立(生活環前期)における輸送機構の解明、4.HBV感染が小胞輸送に与える影響、5. 感染性HBV粒子と小胞輸送が変化することの臨床的意義の検討、の5つを大きな柱とし、HBV生活環における輸送経路の全体像を明らかにしてB型肝炎の病態のさらなる理解と新しい抗HBV療法開発の基盤となる成果を上げることを目的とする。

Outline of Final Research Achievements

We analyzed effects of hepatitis B virus (HBV) infection on the intracellular vesicle trafficking system, focusing on Rab proteins. We have shown that Rab5B inhibited the release of HBV particles from hepatocytes previously. In this study, we showed that HBV infection downregulated Rab5B expression using clinical samples from patients with acute infection and cultured cells. This downregulation was considered to increase HBV release. In contrast, Rab5B expression was increased during chronic infection of HBV and, there was a significant association between Rab5B mRNA and serum HBV DNA, suggesting a possible link between the pathogenesis of chronic hepatitis B and changes of vesicle trafficking system through different mechanisms. In addition, it was revealed that CD63, one of exosome markers, is required for the efficient formation of HBV envelope.

Academic Significance and Societal Importance of the Research Achievements

HBVは一度持続感染すると排除が困難なウイルスであり、持続感染メカニズムの解明は新たな治療法の開発において必要とされている。本研究ではHBV感染がRab5Bの発現に影響し、自身の肝細胞からの放出をコントロールしていることが明らかとなった。急性感染ではウイルス放出を増加させて感染肝細胞を増加させている一方、慢性感染では放出を抑制して免疫から逃れている可能性が示唆された。また、ウイルスを覆っているエンベロープの形成にCD63という分子が必要であることも明らかとなったが、これらの分子は新しい治療法のターゲットの候補となり得ると考えられた。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (12 results)

All 2021 2020 2019 Other

All Int'l Joint Research (3 results) Journal Article (3 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (6 results) (of which Int'l Joint Research: 1 results)

  • [Int'l Joint Research] Mayo Clinic(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Mayo Clinic(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] Mayo Clinic(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Envelope Proteins of Hepatitis B Virus: Molecular Biology and Involvement in Carcinogenesis2021

    • Author(s)
      Inoue Jun、Sato Kosuke、Ninomiya Masashi、Masamune Atsushi
    • Journal Title

      Viruses

      Volume: 13 Issue: 6 Pages: 1124-1124

    • DOI

      10.3390/v13061124

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] The Exosome‐Associated Tetraspanin CD63 Contributes to the Efficient Assembly and Infectivity of the Hepatitis B Virus2021

    • Author(s)
      Ninomiya M, Inoue J, Krueger EW, Chen J, Cao H, Masamune A, McNiven MA
    • Journal Title

      Hepatology Communications

      Volume: - Issue: 7 Pages: 1238-1251

    • DOI

      10.1002/hep4.1709

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Small Interfering RNA Screening for the Small GTPase Rab Proteins Identifies Rab5B as a Major Regulator of Hepatitis B Virus Production2019

    • Author(s)
      Inoue Jun、Ninomiya Masashi、Umetsu Teruyuki、Nakamura Takuya、Kogure Takayuki、Kakazu Eiji、Iwata Tomoaki、Takai Satoshi、Sano Akitoshi、Fukuda Mitsunori、Watashi Koichi、Isogawa Masanori、Tanaka Yasuhito、Shimosegawa Tooru、McNiven Mark A.、Masamune Atsushi
    • Journal Title

      Journal of Virology

      Volume: 93 Issue: 15

    • DOI

      10.1128/jvi.00621-19

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] B型肝炎ウイルス感染による小胞輸送の変化がウイルス放出に与える影響2021

    • Author(s)
      井上 淳,二宮匡史,正宗 淳
    • Organizer
      第57回 日本肝臓学会総会
    • Related Report
      2021 Annual Research Report
  • [Presentation] Exosome-associated tetraspanin CD63 is a potential target for the inhibition of infectious envelope formation of hepatitis B virus2021

    • Author(s)
      Jun Inoue, Masashi Ninomiya, Atsushi Masamune
    • Organizer
      第25回 日本肝臓学会大会(JDDW2021)
    • Related Report
      2021 Annual Research Report
  • [Presentation] Hepatitis B virus infection affects expression of a small GTPase Rab5B resulting in the alteration of viral release2020

    • Author(s)
      Jun Inoue, Masashi Ninomiya, Kosuke Sato, Eiji Kakazu, Tomoaki Iwata, Akitoshi Sano, Mio Tsuruoka, Atsushi Masamune
    • Organizer
      AASLD The Liver Meeting 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] B型肝炎ウイルス粒子形成におけるCD63の役割に関する検討2020

    • Author(s)
      井上 淳、二宮匡史、正宗 淳
    • Organizer
      第43回 日本肝臓学会東部会
    • Related Report
      2020 Research-status Report
  • [Presentation] Rab5BによるHBV粒子放出制御メカニズムの解明と治療応用に向けた検討2019

    • Author(s)
      井上 淳、二宮匡史、正宗 淳
    • Organizer
      第105回 日本消化器病学会総会
    • Related Report
      2019 Research-status Report
  • [Presentation] B型肝炎ウイルスに対するミリストイル化阻害の治療応用の可能性2019

    • Author(s)
      井上 淳、二宮 匡史、正宗 淳
    • Organizer
      第55回 日本肝臓学会総会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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