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Analysis of additional glycosylatoin sites in the envelope protein of Hepatitis B Virus associated with HBV reactivation and hepatocellular carcinogenesis

Research Project

Project/Area Number 19K08479
Research Category

Grant-in-Aid for Scientific Research (C)

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

Principal Investigator

Kiyoaki Ito  愛知医科大学, 医学部, 教授 (50551420)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
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)
Keywords糖鎖修飾変異 / HBV再活性化 / 発癌 / エンベロープ蛋白質 / B型肝炎ウイルス / 再活性化 / 肝臓癌 / 糖鎖修飾
Outline of Research at the Start

免疫抑制や化学療法により発症するB型肝炎ウイルス(HBV)の再活性化は、重症化することが多くその対策は極めて重要である。また、HBVによる肝臓癌はC型肝炎と比較してその発生数が低下しておらず、HBVによる肝発癌への対策は十分とは言い難い。最近、海外からHBVエンベロープ蛋白質上の追加糖鎖修飾がHBV再活性化や発癌症例で高頻度に認められるという報告が相次いでいる。本研究において、国内の追加糖鎖修飾変異の発現頻度を明らかにし、さらにはin vitroおよびin vivo感染モデルを用いてHBVの増殖やウイルス蛋白質発現に与える影響を解析し、発癌や再活性化成立機序のウイルス側因子を解明する。

Outline of Final Research Achievements

There have been reported that "additional glycosylation" on the HBV envelope protein is frequently observed in cases of HBV reactivation and hepatocellular carcinogenesis. In this research project, we have investigated the frequency of occurrence of genomic mutations which create additional glycosylation site in envelope proteins in HBV reactivation cases using the next-generation sequencer (NGS) in Japan, and found that approximately 17% of HBV reactivation cases. We have introduced artificial genomic mutations that create additional glycosylation cite into HBV in vitro infectious model, and analyzed the effects of the artificial genomic mutations on HBV proliferation, viral protein expression, and immunogenicity to clarify the relationship with HBV reactivation and hepatocellular carcinogenesis.

Academic Significance and Societal Importance of the Research Achievements

HBVの再活性化はHBVキャリアや国民のおよそ20-25%にものぼるHBV既往感染者において免疫抑制や化学療法により発生する可能性があり、一度再活性化が発症すると重症化することが多くその対策は極めて重要である。また、HBVによる発癌はC型肝炎ウイルスによるものと比較して未だ制御には至っていない。本研究において、エンベロープ蛋白質追加糖鎖修飾変異のHBV再活性化症例における発現頻度を明らかにした。また、HBV in vitro感染モデルにおいてHBV再活性化や肝発癌に関連するメカニズムを明らかにした。本研究成果はHBV再活性化や発癌対策を講じるうえで極めて重要である。

Report

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

    (9 results)

All 2022 2021 2020

All Journal Article (7 results) (of which Peer Reviewed: 6 results) Book (2 results)

  • [Journal Article] Dual Agonist of Farnesoid X Receptor and G Protein‐coupled Receptor TGR5 Inhibits Hepatitis B Virus Infection in Vitro and in Vivo2021

    • Author(s)
      Ito Kiyoaki、Okumura Akinori、Takeuchi Junko S. 、Watashi Koichi、Inoue Rieko、Yamauchi Taeko、Sakamoto Kazumasa、Yamashita Yukiko、Iguchi Yusuke、Une Mizuho、Wakita Takaji、Umezawa Kazuo、Yoneda Masashi
    • Journal Title

      Hepatology

      Volume: 74(1) Issue: 1 Pages: 83-98

    • DOI

      10.1002/hep.31712

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Mutations in the envelope protein associated with hepatitis B virus reactivation2021

    • Author(s)
      Ito Kiyoaki
    • Journal Title

      Hepatol Research

      Volume: 51 Issue: 2 Pages: 151-153

    • DOI

      10.1111/hepr.13619

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] ステロイドや免疫抑制薬使用中のde novo B型肝炎予防と発症後の対処2021

    • Author(s)
      伊藤清顕
    • Journal Title

      medicina

      Volume: 58 Pages: 410-414

    • Related Report
      2020 Research-status Report
  • [Journal Article] Screening siRNAs against host glycosylation pathways to develop novel antiviral agents against hepatitis B virus2020

    • Author(s)
      Ito Kiyoaki、Angata Kiyohiko、Kuno Atsushi、Okumura Akinori、Sakamoto Kazumasa、Inoue Rieko、Morita Naoko、Watashi Koichi、Wakita Takaji、Tanaka Yasuhito、Sugiyama Masaya、Mizokami Masashi、Yoneda Masashi、Narimatsu Hisashi
    • Journal Title

      Hepatology Research

      Volume: 50 Issue: 10 Pages: 1128-1140

    • DOI

      10.1111/hepr.13552

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Pilot study of tenofovir disoproxil fumarate and pegylated interferon-alpha 2a add-on therapy in Japanese patients with chronic hepatitis B2020

    • Author(s)
      Matsumoto A, Nishiguchi S, Enomoto H, Tanaka Y, Shinkai N, Okuse C, Kang JH, Matsui T, Miyase S, Yatsuhashi H, Nagaoka S, Kanda T, Enomoto M, Yamada R, Hiramatsu N, Saito S, Takaguchi K, Ito K, Masaki T, Morihara D, Tsuge M, Chayama K, Ikeda F, Kagawa T, Kondo Y, Murata K, Tanaka E.
    • Journal Title

      J Gastroenterol.

      Volume: 55(10) Issue: 10 Pages: 977-989

    • DOI

      10.1007/s00535-020-01707-6

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Virological Factors Associated with the Occurrence of HBV Reactivation in Patients with Resolved HBV Infection Analyzed through Ultradeep Sequencing2020

    • Author(s)
      Sakamoto Kazumasa、Umemura Takeji、Ito Kiyoaki、Okumura Akinori、Joshita Satoru、Ota Masao、Sugiyama Masaya、Mizokami Masashi、Yoneda Masashi、Tanaka Eiji
    • Journal Title

      The Journal of Infectious Diseases

      Volume: 14 Pages: 400-407

    • DOI

      10.1093/infdis/jiz478

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] B型肝炎再活性化発症に関連するウイルス側因子2020

    • Author(s)
      伊藤清顕、梅村武司、坂本和賢、奥村彰規、田中榮司、米田政志
    • Journal Title

      肝臓

      Volume: 61 Pages: 237-239

    • NAID

      130007841489

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Book] 医学のあゆみ(HBV侵入阻害効果を持つ胆汁酸誘導体)2022

    • Author(s)
      奥村彰規、伊藤清顕
    • Total Pages
      5
    • Publisher
      医歯薬出版株式会社
    • Related Report
      2021 Annual Research Report
  • [Book] medicina (ステロイドや免疫抑制薬使用中のde novo B型肝炎予防と発症後の対処2021

    • Author(s)
      伊藤清顕
    • Total Pages
      5
    • Publisher
      医学書院
    • Related Report
      2021 Annual Research Report

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

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