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Investigation of host factors which regulate HBV replication using single cell RNA-sequencing

Research Project

Project/Area Number 19K17488
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 53010:Gastroenterology-related
Research InstitutionOsaka International Cancer Institute (2020-2022)
Osaka University (2019)

Principal Investigator

Nakabori Tasuku  地方独立行政法人大阪府立病院機構大阪国際がんセンター(研究所), その他部局等, 肝胆膵内科副部長 (60795160)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2019: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
KeywordsB型肝炎 / アミノ酸代謝 / リプログラミング / 単一細胞解析
Outline of Research at the Start

B型慢性肝炎患者の肝組織ではHBs抗原陽性細胞とHBsAg陰性細胞は不均一に分布し、HBs抗原陽性領域ではHBs抗原陰性領域と比較し、pregenomeRNA (pgRNA)やcccDNAは有意に高値であった。HBs抗原量やpgRNAレベル、cccDNAレベルにより宿主の遺伝子発現が変化することに注目し、単一細胞レベルにおいてpgRNA発現量と宿主遺伝子発現の相関を解析し、HBV複製に伴う肝細胞内の代謝機構の変化や細胞内免疫誘導によるウイルス複製制御機構を解明する。

Outline of Final Research Achievements

HBsAg-positive and -negative cells are heterogeneously distributed in the liver of hepatitis B patients. PgRNA, cccDNA, and BCAT2 (branched chain amino-acid transaminase 2) were significantly higher in the region where HBsAg-positive cells are clustered than in the region where HBsAg-negative cells are clustered.
It was possible to isolate single cells from non-cirrhotic liver with a high viability of about 80% using the liberase perfusion method. On the other hand, the viability of single cells isolated from cirrhotic liver was only about 30%. It was suggested that the viability of cells isolated from the liver may depend on background liver inflammation or fibrosis.

Academic Significance and Societal Importance of the Research Achievements

癌細胞では、近年代謝リプログラミングとして、アミノ酸代謝が癌細胞の生存や分裂増殖、転移などに必要なエネルギーやタンパク質・核酸などの供給に関与していることが報告された(Hattori A, et al. Nature. 2017)が、B型肝炎ウイルス複製においても分岐鎖アミノ酸代謝が関与している可能性が示唆された。
リベラ―ゼ灌流法では、非硬変肝からは高い生細胞率にて単一細胞を分離することができたが、硬変肝から単一分離した細胞では高い生細胞率を維持することはできなかった。線維化や炎症の程度が強い肝臓からの単一細胞分離の手法について改善や見直しが必要があると考えられた。

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (4 results)

All 2022 2020 2019

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

  • [Journal Article] Feasibility of immunotherapy in cancer patients with persistent or past hepatitis B or C virus infection2022

    • Author(s)
      Nakabori Tasuku、Abe Yutaro、Higashi Sena、Hirao Takeru、Kawamoto Yasuharu、Maeda Shingo、Daiku Kazuma、Urabe Makiko、Kai Yugo、Takada Ryoji、Yamai Takuo、Ikezawa Kenji、Uehara Hiroyuki、Ohkawa Kazuyoshi
    • Journal Title

      JGH Open

      Volume: 6 Issue: 5 Pages: 309-316

    • DOI

      10.1002/jgh3.12737

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Presentation] BCAT2 (branched-chain amino acid (BCAA) transaminase 2)抑制はde novo核酸合成経路を介してB型肝炎ウイルス複製を抑制する2020

    • Author(s)
      中堀 輔、疋田 隼人、下田 彬允、福岡 誠、福富 啓祐、村井 一裕 山井 琢陽、山田 涼子、小玉 尚宏、阪森 亮太郎、巽 智秀、竹原 徹郎
    • Organizer
      第56回日本肝臓学会総会
    • Related Report
      2020 Research-status Report
  • [Presentation] Branched-chain amino acid transaminase 2 contributes to HBV pregenome RNA synthesis via de novo nucleotides supply.2019

    • Author(s)
      Tasuku Nakabori, Hayato Hikita, Akiyoshi Shimoda, Makoto Fukuoka, Keisuke Fukutomi, Kazuhiro Murai, Takuo Yamai, Ryoko Yamada, Takahiro Kodama, Ryotaro Sakamori, Hidetoshi Eguchi, Hiroshi Suemizu, Tomohide Tatsumi, Tetsuo Takehara
    • Organizer
      2019 International HBV Meeting
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] INHIBITION OF BRANCHED-CHAIN AMINO ACID TRANSAMINASE 2 SUPPRESSES HEPATITIS B VIRUS REPLICATION THROUGH DE NOVO NUCLEOTIDES SYNTHESIS2019

    • Author(s)
      Tasuku Nakabori, Hayato Hikita, Akiyoshi Shimoda, Makoto Fukuoka, Keisuke Fukutomi, Kazuhiro Murai, Takuo Yamai, Ryoko Yamada, Takahiro Kodama, Ryotaro Sakamori, Hidetoshi Eguchi, Hiroshi Suemizu, Tomohide Tatsumi, Tetsuo Takehara.
    • Organizer
      The Liver Meeting 2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2024-01-30  

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