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Identification of novel HBV resistant to tenofovir (TDF) and elucidation of the resistance mechanisms

Research Project

Project/Area Number 20K16996
Research Category

Grant-in-Aid for Early-Career Scientists

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

Principal Investigator

Hayashi Sanae  熊本大学, 大学院生命科学研究部(医), 特任助教 (10597587)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
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)
KeywordsB型肝炎ウイルス / 核酸アナログ / テノホビル / 変異 / 耐性 / genotype / 肝臓学 / 薬剤耐性
Outline of Research at the Start

B型肝炎ウイルス(HBV)の推奨治療薬である核酸アナログはHBVのDNA複製を抑制するが、耐性HBV株の出現が問題視されている。研究代表者はテノホビル(TDF)抵抗性を示すB型慢性肝炎症例より新規変異を検出したが耐性メカニズムは明らかではない。本研究では、TDF不応例より新規TDF耐性株を同定し抗HBV薬に対する感受性を評価する。さらに既報および新規TDF耐性変異の重要性がHBV genotypeにより異なるかを解明する。
本研究よりTDF不応例のウイルス学的メカニズムが明らかになり現存治療薬の最適な選択が可能となる。またTDF耐性変異のgenotype依存性に対する情報が得られると期待される。

Outline of Final Research Achievements

HBV from thirty-four patients with chronic hepatitis B with multiple drug failure at nationwide multicenter survey were sequenced. Among 23 patients with LAM+ETV failure, 3 patients with LAM or ETV+ADV failure, and 8 patients with ETV+TDF failure, we identified novel mutation in RT region of HBV in 20 of 25 patients with the well-documented drug resistance mutations. A plasmid carrying a replication-competent 1.24-fold HBV genome, isolated from sera of patient who developed VBT during TDF/ETV combination therapy and with the novel RT mutation and ETV-resistant mutations, was tested for TDF susceptibility in vitro. The novel RT mutation plus ETV-resistance mutations reduced susceptibility to TDF compared with the wild-type genotype Ce HBV clone, ADV-resistant 1 strain, and ETV-resistant 2 strains, while the novel RT mutation was equally susceptible to TDF treatment compared with wild-type clone.

Academic Significance and Societal Importance of the Research Achievements

現在推奨される核酸アナログ(NAs)はいずれも強力にHBV複製を抑制するが、HBV根絶には至らないため、B型慢性肝炎の治療適応例の多くは多剤NAs治療を継続している。我々は、ETV/TDFに対して抵抗性を示すB型慢性肝炎症例より新規コンビネーションHBV株を同定し、TDF感受性の低下に寄与することを明らかにした。これまでにETV・TDFに対する交叉耐性変異の報告はないとされるが、推奨NAsであるETVおよびTDF/TAFに対する耐性変異を保有する慢性肝炎症例も散見されることから、今後もNAs治療により薬剤耐性変異株が出現する可能性は疑う余地がない。

Report

(4 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • Research Products

    (11 results)

All 2022 2021 2020

All Journal Article (5 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 5 results,  Open Access: 5 results) Presentation (6 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Ivermectin Inhibits HBV Entry into the Nucleus by Suppressing KPNA22022

    • Author(s)
      Anna Nakanishi, Hiroki Okumura, Tadahiro Hashita, Aya Yamashita, Yuka Nishimura, Chihiro Watanabe, Sakina Kamimura, Sanae Hayashi, Shuko Murakami, Kyoko Ito, Takahiro Iwao, Akari Ikeda, Tomoyasu Hirose, Toshiaki Sunazuka, Yasuhito Tanaka, Tamihide Matsunaga
    • Journal Title

      Viruses

      Volume: 14 Pages: 2468-2468

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Drug Discovery Study Aimed at a Functional Cure for HBV.2022

    • Author(s)
      Takehisa Watanabe, Sanae Hayashi, Yasuhito Tanaka
    • Journal Title

      Viruses

      Volume: 14 Pages: 1393-1393

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Droplet digital PCR assay provides intrahepatic HBV?cccDNA quantification tool for clinical application2022

    • Author(s)
      Hayashi Sanae、Isogawa Masanori、Kawashima Keigo、Ito Kyoko、Chuaypen Natthaya、Morine Yuji、Shimada Mitsuo、Higashi-Kuwata Nobuyo、Watanabe Takehisa、Tangkijvanich Pisit、Mitsuya Hiroaki、Tanaka Yasuhito
    • Journal Title

      Scientific Reports

      Volume: 12 Issue: 1

    • DOI

      10.1038/s41598-022-05882-9

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Blood-Based Biomarkers in Hepatitis B Virus-Related Hepatocellular Carcinoma, Including the Viral Genome and Glycosylated Proteins2021

    • Author(s)
      Hayashi Sanae、Nagaoka Katsuya、Tanaka Yasuhito
    • Journal Title

      International Journal of Molecular Sciences

      Volume: 22 Issue: 20 Pages: 11051-11051

    • DOI

      10.3390/ijms222011051

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Identification of a novel long-acting 4’-modified nucleoside reverse transcriptase inhibitor against HBV2020

    • Author(s)
      Higashi-Kuwata Nobuyo、Hayashi Sanae、Kumamoto Hiroki、Ogata-Aoki Hiromi、Das Debananda、Venzon David、Hattori Shin-ichiro、Bulut Haydar、Hashimoto Mai、Otagiri Masaki、Takamune Nobutoki、Kishimoto Naoki、Davis David A.、Misumi Shogo、Kakuni Masakazu、Tanaka Yasuhito、Mitsuya Hiroaki
    • Journal Title

      Journal of Hepatology

      Volume: 15 Issue: 5 Pages: 33843-5

    • DOI

      10.1016/j.jhep.2020.12.006

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] ddPCR法を用いたcccDNA定量法の開発と臨床応用2022

    • Author(s)
      林 佐奈衣 ,渡邊 丈久 ,田中 靖人
    • Organizer
      the japan society of hepatology
    • Related Report
      2022 Annual Research Report
  • [Presentation] Clinical Utility of Droplet Digital PCR for HBV cccDNA quantification2022

    • Author(s)
      Sanae Hayashi, Yuji Morine, Mitsuo Shimada, Takehisa Watanabe, Yasuhito Tanaka
    • Organizer
      APASL Oncology 2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 核酸アナログ多剤耐性例のウイルス学的特徴2022

    • Author(s)
      林佐奈衣、榎本大、松浦健太郎、井出達也、松居 剛志、髭修平、榎本平之、渡邊丈久、長岡克弥、立山雅邦、田中靖人
    • Organizer
      JDDW
    • Related Report
      2022 Annual Research Report
  • [Presentation] A novel droplet digital PCR reveals the stability of intrahepatic hepatitis B virus cccDNA and its clinical application2021

    • Author(s)
      Sanae Hayashi, Masanori Isogawa, Keigo Kawashima, Kyoko Ito, Natthaya Chuaypen, Nobuyo Higashi-Kuwata, Pisit Tangkijvanich, Hiroaki Mitsuya, Yasuhito Tanaka
    • Organizer
      The Liver Meeting AASLD 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] In vivoで強力な抗HBV活性を発揮する長時間作用型新規核酸アナログE-CFCPの開発2021

    • Author(s)
      林 佐奈衣,田中 靖人,満屋 裕明
    • Organizer
      The Japan Society of Hepatology
    • Related Report
      2021 Research-status Report
  • [Presentation] 新規cccDNA絶対定量系の開発とその臨床応用2020

    • Author(s)
      Sanae Hayashi,Tangkijvanich Pisit,Yasuhito Tanaka
    • Organizer
      第56回日本肝臓学会総会
    • Related Report
      2020 Research-status Report

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Published: 2020-04-28   Modified: 2024-01-30  

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